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Reviewed on May 02, 2019 , Ian Cumming, Yannick Khong

LG C9 OLED
TV REVIEW

Usage Ratings - Version 1.3

Test Benches:

  • 1.3: Spring 2019
  • 1.2: Winter 2018
  • 1.1: Summer 2017
  • 1.0: Winter 2015
  • 0.9: Winter 2014
  • 0.8: Winter 2013
9.0
Mixed Usage
What it is: General purpose. The TV will be used for a variety of content and usages. Movies at night, TV shows during the day, video games from time to time, etc.
Score components:
Value for price beaten by
What it is: Product with the best value in this price range
Other best choice in a cheaper price range
Other best choice in a pricier price range
Automatically updated every hour based on the scores and prices of all other products we've tested.
: LG C8 OLED
9.3
Movies
What it is: Movies in the dark. The TV will be used for watching movies in a controlled environment, directly in front, in a home theater way. Mostly only high quality content, like Blu-rays, UHD Blu-rays, streaming and a little bit of HDR.
Score components:
8.6
TV Shows
What it is: TV Shows in a bright living room. The TV will be used in to watch TV shows, in a bright room during the day, from multiple viewing positions at different angles. The content watched has an average quality: cable, streaming, SD channels, etc.
Score components:
8.8
Sports
What it is: Sports in a living room. The TV will be used to watch sports during the day, like football or hockey. Usually watched with a group, so from multiple viewing position.
9.4
Video Games
What it is: Video games. The TV will be used to play video games, directly in front, in a controlled light environment. Usually fast games, like online FPS, where motion blur and input lag is important.
9.1
HDR Movies
What it is: HDR Movies and TV shows. The TV will be used to watch 4k UHD HDR content, with a wide color gamut and a high peak brightness. Either via UHD Blu-rays or HDR streaming.
Score components:
9.1
HDR Gaming
What it is: HDR Gaming. The TV will be used to play HDR video games using consoles that support it or on current generation gaming PCs. Xbox One S, PS4 Pro, GTX 10 series and AMD RX series graphics cards.
8.7
PC Monitor
What it is: PC Monitor. The TV will be used as a PC monitor, from 2-3 feet away, either for productivity purposes or gaming. Sharp text is important, as well as a high resolution.
Score components:
Type : OLED
Sub-Type
What it is: Type of display technology used by the TV.
When it matters: Different technologies have different performance and are suited to different uses
Good value: IPS maintains good color accuracy at an angle, but has a poor contrast ratio from in front. VA has great picture quality in front, but loses saturation at an angle. OLED maintains good color accuracy at an angle without any of the other issues seen with IPS and VA, as they keep good brightness and contrast at an angle.
:
WRGB
Resolution : 4k

The LG C9 OLED is an excellent TV. Like all OLED TVs, it delivers outstanding dark room performance, thanks to the perfect inky blacks and perfect black uniformity. It has an outstanding response time, delivering clear motion with no blur trail, but this does cause stutter when watching movies. The LG C9 also supports HDMI 2.1 on all four ports, although there is currently little advantage to this, as there are no HDMI 2.1 sources available.

Unfortunately, like all OLED TVs, there is a possibility of experiencing permanent burn-in, and the brightness of the screen changes depending on the content (ABL), which may bother some people.

Pros
  • Perfect deep blacks
  • Extremely low motion blur, and excellent low input lag
  • The image remains accurate when viewed at an angle
Cons
  • Brightness varies with different content due to Automatic Brightness Limiter (ABL)
  • Possibility of permanent burn-in with static content (See here)

Test Results
Design 9.5
Picture Quality 8.7
Motion 9.3
Inputs 9.7
Sound Quality 7.1
Smart Features 8.2
Update 5/17/2019: We've retested the input lag on the same firmware (03.50.31) and found the 4k @ 60Hz + HDR input lag is in the same ballpark as the other resolutions (around 13ms). We don't know why our previous measurements were higher, as we did confirm them twice. We've also updated the 1440p @ 60Hz input lag with this latest firmware.
Update 5/2/2019: We've retested the input lag of the C9 with the firmware update 03.50.31. The input lag measurements in SDR game and PC modes have decreased. We haven't retested 1440p @ 60Hz but we will retest this in the future.

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Market Context

What it is: This model's position in the TV market; how it compares to other TVs.

The LG C9 is a high end 2019 OLED TV, and directly replaces LG's 2018 C8. All OLEDs deliver very similar overall picture quality, so the main differences between the C9 and its competitors are the additional features and the design. The main competitors to the LG C9 are the LG B9, LG E9, Sony A9G, and Sony A8G. The main LED competitors are the Sony Z9F and the Samsung Q90R.

9.5

Design

Score components: Subjectively assigned
Curved : No

The design of the 2019 LG OLED C9 is excellent. Overall, it is very similar to the 2018 LG C8, with only minor differences. The stand supports the TV well, and there is very little wobble. The stand itself is slightly different; it isn't as tall as the C8's, so the panel is closer to the table, and the front portion of the stand doesn't stick out as much. The TV is well-built, so there shouldn't be any issues using it, but it's thin, so care should be taken when moving it.

Stand

The stand supports the TV extremely well, and shouldn't cause any issues. The overall footprint of the stand is very similar to the stand on the C8, and is nearly the full width of the TV, so it still requires a fairly large table.

Footprint of the 55" TV stand: 35.6" x 9.75".

Back
Wall Mount : VESA 300x200

Overall, the back of the 2019 OLED C9 is nearly identical to the 2018 LG C8. Like the previous model, there are some inputs directly on the back, but most of them are towards the side of the TV.

New on the 2019 model is a plastic cover on the back of the stand. Removing this cover exposes a slot that can be used for cable management.

Borders
Borders : 0.37" (0.9 cm)

The borders on the OLED C9 are extremely thin. Like with previous models, there is almost no gap between the edge of the bezel and the start of the pixels.

Thickness
Max Thickness : 1.87" (4.8 cm)

Like with previous LG OLEDs, the bottom half of the TV houses all of the TV's electronics, and the top half is much thinner. Care should be taken when moving the C9, as this thin portion can flex easily.

Temperature
What it is: It is the average and maximum operating temperatures we measured on the TV. If there is an external device, like a One Connect box in some Samsungs, we measure the temperature of that as well.
When it matters: If the temperature of your TV is much higher, check that nothing is blocking the vents.
Maximum Temperature
What it is: The peak temperature found on the TV.
When it matters: If the TV is placed in an enclosed space.
Good value: <35°C
Noticeable difference: 5°C
:
97 °F (36 °C)
Average Temperature
What it is: The average temperature measured on the TV.
When it matters: If the TV is placed in an enclosed space.
Good value: <35°C
Noticeable difference: 5°C
:
88 °F (31 °C)
9.0 Build Quality
What it is: It represents our perception of the quality of the construction of the TV, of the materials used, and how they all blend.
When it matters: Poor build quality might lessen the expected lifetime of the TV, or make it more prone to faults due to mishandling.
Score components: Subjectively assigned

The LG C9 has excellent build quality. The panel-only portion of the TV can flex a bit, but we don't expect this to cause any issues. It is very similar to the 2018 C8 and B8.

8.7

Picture Quality

The LG OLED C9, like all OLED TVs, delivers outstanding picture quality. Thanks to the OLED panel's ability to dim and turn off individual pixels, the C9 has a perfect contrast ratio, producing deep, inky blacks, which is great for dark room viewing. This also results in near-perfect black uniformity, without the need for a local dimming feature. The C9 has wide viewing angles, excellent gray uniformity, and an excellent wide color gamut.

The C9 isn't perfect, though, and it has a few issues that are common with OLEDs that some people might consider deal breakers. Although it has good peak brightness, the aggressive ABL dims the entire screen when there are large bright areas, like when watching hockey, and like all OLED panels, there is a possibility of permanent burn-in. Although it displays an accurate image for the most part, the unit we tested showed some black crush in some very dark scenes which may bother some viewers. We don't know if this affects every unit.

10 Contrast
What it is: Brightness difference between white and black. This is the main component of picture quality.
When it matters: Always, but especially when watching dark scenes.
Score components:
Native Contrast
What it is: Ratio of the white brightness divided by the blacks measured on our checkerboard test pattern with a white target of 100 cd/m².
When it matters: Dark scenes in a dark room.
Good value: > 3,000
Noticeable difference: 500
:
Inf : 1
Contrast with local dimming
What it is: Ratio of the white brightness divided by the blacks measured on our checkerboard test pattern with local dimming turned on (maximum) with a white target of 100 cd/m².
When it matters: Dark scenes in a dark room.
Good value: > 3,000
Noticeable difference: 500
:
N/A

As an OLED panel, the C9 is able to turn off individual pixels, so it essentially has an infinite contrast ratio.

10 Local Dimming
What it is: The lights behind the LCD layer adapt to the picture displayed, improving the contrast ratio.
When it matters: Dark scenes viewed in a dark room.
Score components: Subjectively assigned
Local Dimming
What it is: Whether it has a feature that controls the LEDs behind the LCD layer, to match the picture and darkens the dark portion of it.
When it matters: On LED TVs only. Dark scenes viewed in a dark room.
:
No
Backlight
What it is: Configuration of the lights of the backlight.
When it matters: Effectiveness of the local dimming.
Good value: Full-array/direct lighting is better for local dimming. As for the uniformity of the screen, it depends on the implementation. Some edge-lit TVs have more uniform blacks than some full-array TVs.
:
N/A

The LG OLED C9 does not have a local dimming feature, as there is no backlight. Instead, it is able to turn off or dim individual pixels. This is great for dark room viewing, as there is no noticeable blooming around bright objects in dark scenes, and subtitles are displayed perfectly.

7.7 SDR Peak Brightness
What it is: How bright the screen can get. Measured with local dimming and with SDR content.
When it matters: Bright living rooms; bright objects; SDR content.
SDR Real Scene Peak Brightness
What it is: The maximum luminosity the TV can obtain while playing a movie or while watching a TV show. Our Real Scene was selected to represent a more regular movie condition. All measurements are made with the TV set to be as bright as possible, but with a 6500k white. Measured with local dimming on, max backlight and with an SDR signal. Scene: here.
When it matters: When watching movies and TV shows in SDR.
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
335 cd/m²
SDR Peak 2% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 2% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright highlights, present on screen for a short time
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
447 cd/m²
SDR Peak 10% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 10% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright objects, present on screen for a short time
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
444 cd/m²
SDR Peak 25% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 25% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
398 cd/m²
SDR Peak 50% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 50% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
330 cd/m²
SDR Peak 100% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 100% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
157 cd/m²
SDR Sustained 2% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 2% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright highlights, persistent during a scene.
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
430 cd/m²
SDR Sustained 10% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 10% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright objects, persistent during a scene.
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
426 cd/m²
SDR Sustained 25% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 25% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
382 cd/m²
SDR Sustained 50% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 50% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
317 cd/m²
SDR Sustained 100% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 100% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
Good value: > 300 cd/m²
Noticeable difference: 30 cd/m²
:
151 cd/m²
SDR ABL
What it is: The coefficient of variation of the SDR sustained brightness, after linearizing for noticeable differences in luminosity
When it matters: Content with large bright areas, such as for PC or video game use, and sports such as hockey
Good value: <0.07
Noticeable difference: 0.01
:
0.072

The LG C9 has good peak brightness with SDR content. Small highlights are brighter than on the C8 or B8, but this results in a more aggressive Automatic Brightness Limiter (ABL), which dims the screen significantly when larger areas of the screen get bright.

The C9 has a new Peak Brightness setting, which adjusts how the ABL performs. Setting this to 'Off' results in most scenes being displayed at around 303 cd/m², unless the entire screen is bright, in which case the luminosity drops to around 139 cd/m². Increasing this setting to 'Low', 'Med', or 'High' increases the peak brightness of small highlights. If ABL bothers you, setting the contrast to '80' and setting Peak Brightness to 'Off' essentially disables ABL, but the peak brightness is quite a bit lower (246-258 cd/m² in all scenes).

Unlike most TVs, the C9's peak brightness was measured with the pre-calibration settings, due to an oddity with the 100% window.

These measurements were taken in the 'Expert (Dark Room)' Picture Mode, with OLED Light set to '100', Contrast set to '90', Peak Brightness on 'High'.

Update 6/6/2019: We've retested the SDR peak brightness of the C9 with the firmware update 03.60.02. There are no significant changes in brightness from our previous measurements.

7.7 HDR Peak Brightness
What it is: How bright the screen can get. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright living rooms; bright objects; HDR content.
HDR Real Scene Peak Brightness
What it is: The maximum luminosity the TV can obtain while playing a movie or while watching a TV show. This scene was selected to represent a more realistic movie condition. All measurement are made with the TV set to be as bright as possible, but with a 6500k white. Measured with local dimming, max backlight and over HDR signal. Scene: here.
When it matters: When watching movies or watching TV show in HDR.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
726 cd/m²
HDR Peak 2% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 2% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright highlights, present on screen for a short time; especially for HDR content.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
855 cd/m²
HDR Peak 10% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 10% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright objects, present on screen for a short time; especially for HDR content.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
845 cd/m²
HDR Peak 25% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 25% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright rooms; bright objects in HDR video.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
530 cd/m²
HDR Peak 50% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 50% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright rooms.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
301 cd/m²
HDR Peak 100% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 100% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright rooms.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
145 cd/m²
HDR Sustained 2% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 2% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright highlights, persistent throughout a scene; especially for HDR content.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
814 cd/m²
HDR Sustained 10% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 10% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright objects, persistent throughout a scene; especially for HDR content.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
802 cd/m²
HDR Sustained 25% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 25% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright rooms; bright objects in HDR video.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
506 cd/m²
HDR Sustained 50% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 50% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright rooms.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
286 cd/m²
HDR Sustained 100% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 100% of the screen, with the TV set to be as bright as possible. Measured with local dimming and over HDR signal (if supported).
When it matters: Bright rooms.
Good value: > 550 cd/m²
Noticeable difference: 80 cd/m²
:
138 cd/m²
HDR ABL
What it is: The coefficient of variation of the HDR sustained brightness, after linearizing for noticeable differences in luminosity
When it matters: HDR content with large bright areas, such as HDR gaming
Good value: <0.07
Noticeable difference: 0.01
:
0.109

The C9 can reach very good brightness levels with HDR content; slightly better than the 2018 LG C8, but still not as good as top LED models like the Samsung Q90R or Sony Z9F. Unfortunately, it doesn't perform as well in all scenes, due to the C9's aggressive ABL that dims the screen with different content. This is especially noticeable in content with large bright areas.

The HDR brightness measurements were taken in 'Cinema' mode, with OLED Light set to '100,' and Peak Brightness on 'High.' Different picture modes and color temperatures will produce different results.

8.6 Gray Uniformity
What it is: Evenness of colors onscreen (not just gray).
When it matters: Solid colors. Sports, panning shots.
Score components:
50% Std. Dev.
What it is: Average squared difference of pixels when displaying a mid 50% gray.
When it matters: Solid colors. Sports, panning shots.
Good value: < 2.5%
Noticeable difference: 1%
:
0.989 %
50% DSE
What it is: Dirty Screen Effect. High-frequency variance of uniformity. Dark spots on the screen.
When it matters: Solid colors. Sports, panning shots.
Good value: < 0.165%
Noticeable difference: 0.025%
:
0.128 %
5% Std. Dev.
What it is: Average squared difference of pixels when displaying a mid 5% gray.
When it matters: Dark scenes.
Good value: < 1.15%
Noticeable difference: 1%
:
0.499 %
5% DSE
What it is: Dirty Screen Effect. High-frequency variance of uniformity. Dark spots on the screen.
When it matters: Dark scenes.
Good value: < 0.116%
:
0.102 %

Excellent gray uniformity. There is very little dirty screen effect, which is great for sports fans. Uniformity of near-dark scenes is even better, which is great. Like previous OLED TVs, there are some very faint horizontal and vertical lines noticeable in a pitch black room when displaying near-black scenes.

8.8 Viewing Angle
What it is: Color accuracy when viewed from the side.
When it matters: Large living rooms with multiple viewing positions.
Color Washout
What it is: The angle at which some colors drop to 80% of their original chroma.
When it matters: When viewing colorful content from the side.
Good value: > 45°
Noticeable difference: 10°
:
49 °
Color Shift
What it is: The angle at which some colors hue shift by 3° (meaning they change color, such as becoming more blue-ish).
When it matters: When viewing colorful content from the side.
Good value: > 45°
Noticeable difference: 10°
:
31 °
Brightness Loss
What it is: The angle at which the TV's lightness drops to 75% of its original lightness.
When it matters: When viewing any content from the side.
Good value: > 45°
Noticeable difference: 10°
:
67 °
Black Level Raise
What it is: The angle at which the black level doubles its lightness, leading to dark shades looking washed out.
When it matters: When viewing dark content from the side.
Good value: > 45°
Noticeable difference: 10°
:
70 °
Gamma Shift
What it is: The angle at which some grayscale shades shift by 3% of their relative position between the black and white levels.
When it matters: When watching any content at an angle.
Good value: > 45°
Noticeable difference: 10°
:
67 °

Like all OLED TVs, the LG C9 has outstanding wide viewing angles. The brightness and black levels are good even at extremely wide viewing angles, better than LED TVs. Unfortunately, colors shift and lose accuracy at moderate angles, worse than the Sony Z9F and the Samsung Q90R, which use VA panels and a special viewing angle filter.

10 Black Uniformity
What it is: Evenness of blacks.
When it matters: Dark scenes viewed in a dark room.
Score components:
Native Std. Dev.
What it is: Average of the squared difference of the blacks.
When it matters: Dark scenes viewed in a dark room.
Good value: < 1%
Noticeable difference: 1%, but keep in mind that it varies a lot by unit, even of the same model; yours likely will not end up exactly like ours.
:
0.249 %
Std. Dev. w/ L.D.
What it is: Average of the squared difference of the blacks with Local Dimming enabled
When it matters: Dark scenes viewed in a dark room.
Good value: < 1%
Noticeable difference: 1%, but keep in mind that it varies a lot by unit, even of the same model; yours likely will not end up exactly like ours.
:
N/A

As the C9 can turn off individual pixels, it has near-perfect black uniformity. There is no noticeable blooming around the cross, which is great, especially if you watch content with subtitles on a dark background.

9.5 Reflections
What it is: How much light is reflected by the TV.
When it matters: Bright rooms.
Score components:
Screen Finish
What it is: Type of coating on the screen.
When it matters: Bright objects in the direct reflection path (for example, opposite the TV).
Good value: Glossy is good for ambient light, but not for direct reflections.
:
Glossy
Total Reflections
What it is: The amount of light which is reflected off the screen, in all directions.
When it matters: When watching TV in a bright room, with lamps, windows or walls which reflect directly off the screen.
Good value: 4.5 %
Noticeable difference: 0.5 %
:
1.4 %
Indirect Reflections
What it is: The amount of light reflected off the screen, ignoring direct (mirror-like) reflections
When it matters: Watching TV in a bright room, without sunlight or lamps directed at the TV
Good value: 1.0 %
Noticeable difference: 0.5 %
:
0.1 %

The LG OLED C9 has outstanding reflection handling, very similar to last year's C8. Like many high-end TVs, the anti-reflective coating adds a slight purple tint. There should be no issues using the TV in a bright room, but if you have a lot of windows it might not be bright enough to completely overcome glare.

7.6 Pre Calibration
What it is: TV's color accuracy before a full calibration. The only settings that are changed are those that don't vary from unit to unit, like picture mode, color temperature and gamma.
When it matters: All video on an uncalibrated TV. This represents most people's use cases.
Score components:
White Balance dE
What it is: Average inaccuracy of shades of gray.
When it matters: Overall color temperature of all video.
Good value: < 3
Noticeable difference: 1
:
3.46
Color dE
What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
2.11
Gamma
What it is: Brightness of shades of gray.
When it matters: Shadows.
Good value: Between 2.1 and 2.3 (our target is 2.2)
Noticeable difference: 0.1
:
2.17
Color Temperature
What it is: The color temperature is a measure of the color of light. A colder color temperature (7000K) will look bluer and a warmer color temperature (4000K) will look yellower/redder. 6500K is the standard color temperature use in the TV and film industry as program, film, and photography directors usually work on monitors calibrated on the 6500k color temperature and do their color correction base on what they see on those monitors.
When it matters: To get the most accurate picture when watching TV shows, movies or video games. This is particularly for skin tones.
Good value: 6500K
Noticeable difference: 400K
:
5929 K
Picture Mode
What it is: The picture mode used to do the 'Pre Calibration' measurements.
:
Expert (Dark Room)
Color Temp Setting
What it is: The best value for the TV's color temperature setting. The setting name differs between brands; for some it's "Color Temperature", for others its "White Point".
When it matters: All content on screen
:
Warm 2
Gamma Setting
What it is: The best value for the TV's gamma setting; the setting name differs between TV brands.
When it matters: Shadows, accurate grayscale performance.
:
2.2

The LG OLED C9 has good accuracy with our pre-calibration settings. Colors are accurate, and most people shouldn't notice any inaccuracies, but the white balance is a little off, giving pure whites a slightly yellowish tint that some people might notice.

Overall, it follows the gamma target well, but some near-black details are crushed. This can be seen in the spike at the beginning of this higher resolution gamma plot. Increasing the Brightness setting does help compensate for this a bit, but doesn't completely correct it.

9.6 Post Calibration
What it is: TV's color accuracy after a full calibration with a spectrophotometer.
When it matters: All video on a TV that has been professionally calibrated. This isn't that useful, because most TVs can achieve a pretty good calibration if you spend enough time on them.
Score components:
White Balance dE
What it is: Average inaccuracy of shades of gray.
When it matters: Overall color temperature of all videos.
Good value: < 3
Noticeable difference: 1
:
0.44
Color dE
What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
0.91
Gamma
What it is: Brightness of shades of gray.
When it matters: Shadows.
Good value: Between 2.1 and 2.3 (our target is 2.2)
Noticeable difference: 0.1
:
2.18
Color Temperature
What it is: The color temperature is a measure of the color of light. A colder color temperature (7000K) will look bluer and a warmer color temperature (4000K) will look yellower/redder. 6500K is the standard color temperature use in the TV and film industry as program, film, and photography directors usually work on monitors calibrated on the 6500k color temperature and do their color correction base on what they see on those monitors.
When it matters: To get the most accurate picture when watching TV shows, movies or video games. This is particularly for skin tones.
Good value: 6500K
Noticeable difference: 400K
:
6539 K
White Balance Calibration
What it is: Whether the TV's white balance can be finely calibrated.
When it matters: When calibrating the TV.
:
22 point
Color Calibration
What it is: Whether the TV's color tone mapping can be finely calibrated.
When it matters: When calibrating the TV.
:
Yes
Auto-Calibration Function
What it is: Whether the TV has an auto-calibration function that can be used with a measurement device. Note that this is not used during testing, as we calibrate the TV manually.
When it matters: When calibrating the TV.
:
Yes

After calibration, the LG OLED C9 has nearly perfect accuracy. The white balance dE and color accuracy are both extremely good, and any remaining inaccuracies are completely unnoticeable.

The TV features an auto-calibration feature. This feature still requires a licensed copy of CalMAN, and a colorimeter.

You can see our recommended settings here.

8.0 480p Input
What it is: Quality of a 480p input.
When it matters: Standard definition TV, DVDs.
Score components: Subjectively assigned

The C9 upscales 480p content well, with no obvious upscaling artifacts.

8.0 720p Input
What it is: Quality of a 720p input.
When it matters: HD channels, some streaming videos.
Score components: Subjectively assigned

720p content is upscaled well, with no strange artifacts. There is a new AI upscaling feature, as well as the existing Super Resolution feature found on older LG TVs. Visually, we didn't notice much difference between them with our test patterns, but for some content it might make a difference.

9.0 1080p Input
What it is: Quality of a 1080p input.
When it matters: Blu-rays, streaming video, video files, video games.
Score components: Subjectively assigned

1080p content looks almost as good as native 4k content on the C9.

10 4k Input
What it is: Quality of a 4k UHD input.
When it matters: Streaming video, UHD Blu-rays, PC use.
Score components: Subjectively assigned

Although the C9 uses an RGBW pixel structure, there are no issues displaying 4k content, as each pixel has all four sub-pixels.

8.6 Color Gamut
What it is: How many colors the TV can display.
When it matters: HDR content. Includes some streaming videos and UHD Blu-rays.
Score components:
Wide Color Gamut
What it is: Whether the TV has an option to enable wide color gamuts.
When it matters: HDR content. Includes some streaming videos and UHD Blu-rays.
:
Yes
DCI P3 xy
What it is: Coverage of the DCI P3 colorspace on CIE 1931 xy.
When it matters: DCI P3 content. Includes HDR, UHD Blu-rays.
Good value: > 90%
Noticeable difference: 5%
:
97.21 %
DCI P3 uv
What it is: Coverage of the DCI P3 colorspace on CIE 1976 u' v'.
When it matters: DCI P3 content. Includes HDR, UHD Blu-rays.
Good value: > 90%
Noticeable difference: 5%
:
98.68 %
Rec 2020 xy
What it is: Coverage of the Rec.2020 colorspace on CIE 1931 xy.
When it matters: Rec.2020 content. Includes HDR, UHD Blu-rays.
Good value: > 90%
Noticeable difference: 5%
:
71.57 %
Rec 2020 uv
What it is: Coverage of the Rec.2020 colorspace on CIE 1976 u' v'.
When it matters: Rec.2020 content. Includes HDR, UHD Blu-rays.
Good value: > 90%
Noticeable difference: 5%
:
75.53 %

The C9 can display a wide color gamut, which is great for watching HDR content. It can display almost the entire DCI P3 color space, which is great, and has good coverage of the wider Rec. 2020 color space.

In 'Cinema' mode, the TV follows the target PQ curve very closely, but has a sharp roll off at the TV's peak brightness, so some bright detail may be crushed. In 'Game' mode, the EOTF is nearly identical.

With the 2019 version of the CalMAN software, it is possible to customize the TV's EOTF. We didn't test this out, but you can find out more about this feature here.

If you find HDR too dim, check out our recommendations here.

7.3 Color Volume
What it is: How many colors a TV can display at different luminosity levels.
When it matters: HDR content. Includes some streaming videos, UHD Blu-rays and HDR games.
Normalized DCI P3 Coverage ITP
What it is: How much of the DCI-P3 colorspace a TV can display at different luminosity levels
When it matters: HDR content. Includes some streaming videos, UHD Blu-rays and HDR games.
Good value: 80%
Noticeable difference: 5%
:
84.6 %
10,000 cd/m² DCI P3 Coverage ITP
What it is: How much of the DCI-P3 colorspace a TV can display at different luminosity levels when compared to an ideal 10,000 nit TV
When it matters: HDR content. Includes some streaming videos, UHD Blu-rays and HDR games.
:
46.8 %
Normalized Rec 2020 Coverage ITP
What it is: How much of the Rec. 2020 colorspace a TV can display at different luminosity levels
When it matters: HDR content. Includes some streaming videos, UHD Blu-rays and HDR games.
Good value: 80 %
Noticeable difference: 5 %
:
61.7 %
10,000 cd/m² Rec 2020 Coverage ITP
What it is: How much of the Rec 2020 colorspace a TV can display at different luminosity levels when compared to an ideal 10,000 nit TV
When it matters: HDR content. Includes some streaming videos, UHD Blu-rays and HDR games.
:
34.4 %

The C9 has decent color volume, very similar to the C8. Although the C9 has an excellent color gamut, it loses volume at the top. The WRGB pixel structure allows it to produce bright whites, but colors aren't as bright. On the other hand, thanks to the perfect contrast ratio it can produce dark saturated colors with no issues, unlike the majority of LED TVs.

9.0 Gradient
What it is: How finely levels of color can be displayed.
When it matters: Details in shadows, sky and skin tones. Matters more for HDR content.
Color Depth
What it is: Number of bits per pixel to represent a specific color. Note: we consider 8-bit with dithering to be equivalent to 10-bit, as long as the 10-bit gradient looks smooth.
When it matters: HDR content like UHD Blu-ray players. Won't matter for cable TV, regular Blu-ray movies, video game consoles or content displayed from a Windows PC. Those are limited to 8-bit color.
Good value: 10-bit.
Noticeable difference: 1 bit.
:
10 Bit
Red (Std. Dev.)
What it is: The standard deviation of the color differences (dE) between subsequent 10 bit red shades.
When it matters: Details in skin tones, sunsets, and other reddish objects. Matters more for HDR content.
Good value: < 0.12 dE
Noticeable difference: 0.01 dE
:
0.081 dE
Green (Std. Dev.)
What it is: The standard deviation of the color differences (dE) between subsequent 10 bit green shades.
When it matters: Details in ocean shades and other greenish objects. Matters more for HDR content.
Good value: < 0.12 dE
Noticeable difference: 0.01 dE
:
0.091 dE
Blue (Std. Dev.)
What it is: The standard deviation of the color differences (dE) between subsequent 10 bit blue shades.
When it matters: Details in skies, water and other blueish objects. Matters more for HDR content.
Good value: < 0.12 dE
Noticeable difference: 0.01 dE
:
0.072 dE
Gray (Std. Dev.)
What it is: The standard deviation of the color differences (dE) between subsequent 10 bit gray shades.
When it matters: Details in dull colors, such as shadows, glow and urban scenes. Matters more for HDR content.
Good value: < 0.12 dE
Noticeable difference: 0.01 dE
:
0.074 dE

The C9 has excellent gradient handling. There is some very slight banding in some colors, but this shouldn't be very noticeable.

When watching lower quality content that has lots of banding in it, the Smooth Gradation feature can help to reduce banding, especially when there are large areas of banding. Note that enabling this feature can cause a loss of fine details in some scenes, but the C9 appears to behave differently from the C8 and is a bit more conservative.

10 Temporary Image Retention
What it is: How much a static image is retained on a TV screen after a certain amount of time.
When it matters:

When watching TV show, playing video games or when using your TV as a PC monitor.

Note that this is different to permanent burn-in, learn more about permanent burn-in here.

IR after 0 min recovery
What it is: Image retention measured right after the static image exposure, without recovery time.
When it matters: When changing channels while watching TV, right after changing the type of content (i.e. stopping playing video game to watch a movie) or changing input.
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.00 %
IR after 2 min recovery
What it is: Image retention measured after a recovery time of 2 minutes.
When it matters: When changing channels while watching TV, right after changing the type of content (i.e. stopping playing video game to watch a movie) or changing input.
Good value: 0 is perfect
Noticeable difference: 0.015%
:
0.00 %
IR after 4 min recovery
What it is: Image retention measured after a recovery time of 4 minutes.
When it matters: When changing channels while watching TV, right after changing the type of content (i.e. stopping playing video game to watch a movie) or changing input.
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.00 %
IR after 6 min recovery
What it is: Image retention measured after a recovery time of 6 minutes.
When it matters: When changing channels while watching TV, right after changing the type of content (i.e. stopping playing video game to watch a movie) or changing input.
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.00 %
IR after 8 min recovery
What it is: Image retention measured after a recovery time of 8 minutes.
When it matters: When changing channels while watching TV, right after changing the type of content (i.e. stopping playing video game to watch a movie) or changing input.
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.00 %
IR after 10 min recovery
What it is: Image retention measured after a recovery time of 10 minutes.
When it matters: When changing channels while watching TV, right after changing the type of content (i.e. stopping playing video game to watch a movie) or changing input.
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.00 %

The C9 shows some slight signs of temporary image retention, but it is too faint to be detected by our software.

This test is only indicative of short term image retention, and not the permanent burn-in that may occur with longer exposure to static images. We are currently running a long-term test to help us better understand permanent burn-in. You can see our results and read more about our investigation here.

1.0 Permanent Burn-In Risk
What it is: The risk of developing a persistent image retention, also known as burn-in, after being exposed to a static image for a prolonged time
When it matters: When watching TV shows, playing video games or when using your TV as a PC monitor where static content is present
Score components:
Permanent Burn-In Risk
What it is: If the TV faces a risk of developing permanent burn-in after being expose, for a long period of time, to static images.
When it matters: When watching TV shows with static logos or banners (news or sports channels), when playing video games with a HUD (head up display), and when using a TV as a PC monitors.
:
Yes

OLED TVs such as the LG OLED C9 have an inherent risk of experiencing permanent image retention.

The LG C9 has three features to help mitigate burn-in. We recommend enabling the Screen Shift option, and setting Logo Luminance Adjustment to 'Low.' There is also an automatic pixel refresher that can be run manually if needed.

You can read about our investigation into this here.

Pixels
What it is: The smallest element a screen can display is called a pixel. In color TVs, this consists of three (or more) subpixels. This is a picture of the TV's pixel structure.
When it matters: It can help explain some display behaviors and can provide an indication of whether two panels are the same or not.

Like all other OLEDs, the C9 uses 4 sub-pixels, but all 4 are never used at the same time. This image shows the red, white, and blue sub-pixels. You can see the green sub-pixel in our alternative pixel photo.

9.3

Motion

The LG C9 has outstanding motion handling for the most part. It has a nearly-instantaneous response time, which is great, but this also results in a more noticeable stutter, especially when watching 24p content, which may bother some people. It has an optional Black Frame Insertion feature and a motion interpolation function that can interpolate lower frame rate content up to 120Hz. The C9 also supports a variable refresh rate, but it is only compatible with the HDMI 2.1 VRR technology, and not FreeSync or G-SYNC, so it isn't compatible with most existing sources, except for the Xbox One.

10 Response Time
What it is: Amount of blur in fast motion.
When it matters: Sports, video games.
Score components:
80% Response Time
What it is: How quickly pixels can reach 80% of a full transition from one color to another.
When it matters: Fast movement.
Good value: < 8 ms
Noticeable difference: 4 ms
:
0.2 ms
100% Response Time
What it is: How quickly pixels can fully transition from one color to another.
When it matters: Fast movement.
Good value: < 20 ms
Noticeable difference: 10 ms
:
2.4 ms

Like all OLED TVs, the LG C9 has a nearly-instantaneous response time. There is some very subtle overshoot in near-black scenes, but this shouldn't be very noticeable.

This extremely fast response time can cause the image to stutter, which may bother some people.

10 Flicker-Free
What it is: How noticeable flicker is on the screen, when all optional flicker has been disabled.
When it matters: All usages, but particularly when viewing fast motion (such as in sports and video games) or when using the TV as a PC monitor.
Score components:
Flicker-Free
What it is: Whether the screen will be perceived as having no flicker during normal viewing conditions.
When it matters: When flicker is especially bothersome, such as when using the TV as a PC monitor.
Good value: Yes
:
No
PWM Dimming Frequency
What it is: The flicker frequency of the screen, when all optional flicker has been disabled.
When it matters: All usages, but particularly when viewing fast motion (such as in sports and video games) or when using the TV as a PC monitor.
Good value: 0 Hz or very high frequencies (> 300 Hz). Frequencies that are multiples of 60Hz are better.
:
0 Hz

The LG C9 does not use PWM, as there is no backlight, but there is a slight dip in brightness approximately every 8 ms, which coincides with the TV's refresh rate. This should not be noticeable.

8.7 Black Frame Insertion (BFI)
What it is: How effective the TV's flickering capabilities are in making motion look clearer, when flicker is desired.
When it matters: When flicker is desired by the user. Flicker is especially useful to make motion look clearer when viewing 60 fps content (sports, video games) and when using motion interpolation.
Optional BFI
What it is: Option to turn the screen black between frames.
When it matters: When flicker is desired by the user. Flicker is especially useful to make motion look clearer when viewing 60 fps content (sports, video games) and when using motion interpolation.
Good value: Yes
:
Yes
Min Flicker for 60 fps
What it is: Lowest possible frequency of flickering pattern when playing 60 fps content.
When it matters: When viewing fast motion such as sports and video games.
Good value: 60 Hz
Noticeable difference: 20 Hz
:
60 Hz
60 Hz for 60 fps
What it is: Whether the screen can flicker at 60 Hz when playing 60 fps content.
When it matters: When playing 60 fps content, such as sports and video games.
Good value: Yes
:
Yes
120 Hz for 120 fps
What it is: Whether the screen can flicker at 120 Hz when playing 120 fps content.
When it matters: When playing 120 fps content, such as when using motion interpolation on a 120 Hz TV.
Good value: Yes
:
No
Min Flicker for 60 fps in Game Mode
What it is: Lowest possible frequency of flickering pattern when playing 60 fps content in Game Mode.
When it matters: When playing video games with fast motion.
Good value: 60 Hz
Noticeable difference: 20 Hz
:
60 Hz

The LG C9 has an optional Black Frame Insertion feature that can improve the appearance of motion.

On the C9, this option is activated by setting TruMotion to 'User' and toggling the OLED Motion setting. This option can only be turned on or off, and it always flickers at 60Hz. Enabling this option will cause judder when playing back 24p content.

10 Motion Interpolation
What it is: Also known as 'Soap Opera Effect'. It is an optional feature that increases the frame rate of the video, smoothing movement.
When it matters: If you like the look of smoothed video. Not everyone does.
Motion Interpolation (30 fps)
What it is: Whether the TV can take a 30 fps input and heighten the frame rate to at least 60 fps.
When it matters: 30 fps or lower videos. Includes movies, TV shows, some video games.
:
Yes
Motion Interpolation (60 fps)
What it is: Whether the TV can take a 60 fps input and heighten the frame rate to at least 100 fps.
When it matters: 60 fps videos. Includes some video games, some sports channels.
:
Yes

The C9 can interpolate lower frame-rate content up to 120Hz. This introduces an effect known as the 'Soap Opera Effect,' which some people don't like, but reduces the amount of stutter. Like many TVs, the C9 stops interpolating during fast scene changes, which can cause an unstable frame rate, which might be noticeable.

See here for the settings that control the C9's motion interpolation feature.

5.0 Stutter
What it is: Jarring effect caused by static frame time during motion sequences
When it matters: When watching content with long panning shots and other smooth movement
Frame Hold Time @ 24 fps
What it is: Time that frame is static during 24Hz videos such as movies
When it matters: When watching movies and other low frame rate content which contain panning shots
Good value: < 24 ms
Noticeable difference: 5 ms
:
39.3 ms
Frame Hold Time @ 60 fps
What it is: Time that frame is static during 60 fps content such as TV shows
When it matters: When watching 60 fps content containing slow panning shots (such as field sports)
Good value: < 24 ms
Noticeable difference: 5 ms
:
14.3 ms

Due to the nearly instantaneous response time of the LG OLED C9, 24p motion can appear to stutter, as each frame is held static onscreen for nearly the entire time. This can be especially noticeable in slow panning shots when watching movies.

If this effect bothers you, you can either enable the TV's OLED Motion feature, which can help a bit, or enable the C9's motion interpolation feature.

10 24p Judder
What it is: Whether 24p content can play without any judder.
When it matters: Only 24p content (mostly just movies).
Judder-Free 24p
What it is: Judder-free movies over 24p signal.
When it matters: Blu-ray and DVD movies; 24 hz PC signal.
:
Yes
Judder-Free 24p via 60p
What it is: Judder-free movies over 60p signal.
When it matters: Movies from streaming devices (Apple TV, Fire TV, etc.); 60 hz PC signal.
:
Yes
Judder-Free 24p via 60i
What it is: Judder-free movies over 60i signal.
When it matters: Movies from cable/satellite boxes.
:
Yes
Judder-Free 24p via Native Apps
What it is: Judder-free movies when playing from native apps.
When it matters: Movies from streaming native apps (Netflix, Amazon TV, etc.).
:
Yes

The LG C9 is able to play 24p content without judder, regardless of the source.

See our recommended settings to remove judder here.

When the TV's BFI mode is enabled, there is always judder with 24p content.

not tested Variable Refresh Rate
What it is: How frequently the TV can refresh and show new frames, and whether it can vary its refresh rate in real time using technologies like HDMI Forum's Variable Refresh Rate.
When it matters: Mostly for gaming, but does provide a little better motion during normal usage.
Native Refresh Rate
What it is: The out-of-the-box maximum refresh rate; how frequently the TV can refresh and show new frames.
When it matters: When playing content with a frame rate that matches the TV's refresh rate (ex. 60 fps on a 60 Hz TV, 120 fps on a 120 Hz TV), or when using the TV's motion interpolation feature (soap opera effect).
Good value: 60 Hz
:
120 Hz
Variable Refresh Rate
What it is: Feature that allows the TV to synchronize its refresh rate with the input device's output and reduces stuttering and screen tearing.
When it matters: Almost every usage, but is most noticeable when gaming where constant fluctuation in framerate cause distracting artifacts.
:
HDMI Forum VRR
VRR Supported Connectors
What it is: The inputs which support a variable refresh rate (eg. HDMI, DisplayPort)
When it matters: When gaming with different consoles or graphics cards.
:
HDMI

Update 05/03/2019: There is currently an issue when using the C9 in 'Game' mode with an Xbox One, we've updated the text below.

The LG C9 has a native 120Hz refresh rate, and it supports VRR, which is great. Unfortunately, it only supports HDMI Forum's new HDMI-VRR format, which is not compatible with FreeSync or G-SYNC. The only device currently on the market which supports HDMI-VRR is the Xbox One. We tested it for compatibility with the Xbox One, and it does appear to work, but only in SDR. If HDR is enabled on the Xbox and you are in Game mode, the screen flickers constantly. LG has confirmed that they are working on a fix. Unfortunately, it isn't possible to determine the VRR range with an Xbox One.

It is unlikely that HDMI-VRR will remain an Xbox exclusive format. If updated drivers or new graphics cards are released that support it, we will retest the C9 to determine the VRR range.

9.7

Inputs

Score components:

The LG OLED C9 has outstanding low input lag, great for gaming, and supports the majority of common input formats. New this year is support for 1440p input, an Auto Low Latency mode for gaming, and eARC support. All supported resolutions can also display chroma 4:4:4 without any issues, which is great for PC use.

9.7 Input Lag
What it is: Delay between input and onscreen reaction.
When it matters: Video games; when TV is used as PC monitor.
1080p @ 60 Hz
What it is: Lowest input lag possible for a 1080p @ 60 Hz input signal.
When it matters: Gaming and PC use.
Good value: < 40 ms
Noticeable difference: 15 ms
:
13.5 ms
1080p @ 60 Hz Outside Game Mode
What it is: Lowest input lag possible for a 1080p @ 60 Hz input signal when in a fully featured picture mode.
When it matters: For gaming and PC use, while retaining access to all features of the TV.
Good value: < 40 ms
Noticeable difference: 15 ms
:
100.8 ms
1440p @ 60 Hz
What it is: Lowest input lag possible for a 1440p @ 60Hz input signal.
When it matters: Gaming and PC use.
Good value: < 40 ms
Noticeable difference: 15 ms
:
13.9 ms
4k @ 60 Hz
What it is: Lowest input lag possible for a 4k @ 60 Hz input signal.
When it matters: Gaming and PC use.
Good value: < 40 ms
Noticeable difference: 15 ms
:
13.4 ms
4k @ 60 Hz + HDR
What it is: Lowest input lag possible for a 4k @ 60 Hz + HDR input signal.
When it matters: Gaming and PC use in HDR.
Good value: < 40 ms
Noticeable difference: 15 ms
:
13.4 ms
4k @ 60 Hz @ 4:4:4
What it is: Lowest input lag possible when displaying 4k @ 60 Hz with proper full 4:4:4 chroma, without subsampling. For this test a 4k @ 60 Hz @ 4:4:4 signal is usually used, but a 4k @ 60 Hz @ Full RGB signal may be used if it's required for the TV to show proper 4:4:4 chroma subsampling.
When it matters: PC use and gaming where fine text display (ClearType) is needed.
Good value: < 40 ms
Noticeable difference: 15 ms
:
13.3 ms
4k @ 60 Hz Outside Game Mode
What it is: Lowest input lag possible for a 4k @ 60 Hz input signal when in a fully featured picture mode.
When it matters: For gaming and PC use, while retaining access to all features of the TV.
Good value: < 40 ms
Noticeable difference: 15 ms
:
50.6 ms
4k @ 60 Hz With Interpolation
What it is: Lowest input lag possible for a 4k @ 60 Hz input signal, when motion interpolation is turned on.
When it matters: When you want to play video games with motion interpolation (Soap Opera Effect) enabled.
Good value: < 40 ms
Noticeable difference: 15 ms
:
96.7 ms
8k @ 60 Hz
What it is: Lowest input lag possible for an 8k @ 60Hz input signal.
When it matters: PC use.
Good value: < 40 ms
Noticeable difference: 15 ms
:
N/A
1080p @ 120 Hz
What it is: Lowest input lag possible for a 1080p @ 120 Hz input signal.
When it matters: Console gaming and PC gaming.
Good value: < 40 ms
Noticeable difference: 15 ms
:
6.8 ms
1440p @ 120 Hz
What it is: Lowest input lag possible for a 1440p @ 120 Hz input signal.
When it matters: Console gaming and PC gaming.
Good value: < 40 ms
Noticeable difference: 15 ms
:
6.6 ms
8k with VRR
What it is: Lowest input lag possible for an 8k input signal when using Variable Refresh Rate (FreeSync, etc).
When it matters: When using a PC that supports Variable Refresh Rate.
Good value: < 40 ms
Noticeable difference: 15 ms
:
N/A
Auto Low Latency Mode (ALLM)
What it is: Whether a source (such as a game console) can request the TV switch into a low latency mode (such as game mode).
When it matters: Console gaming; both PS4 and Xbox One S/X support ALLM.
:
Yes

The LG C9 has outstanding low SDR input lag in 'Game' mode. In 'PC' mode, the input lag is higher than the C8, which is somewhat strange. With the latest firmware (05.30.31) we measured a higher input lag with 4k @ 60Hz + HDR signals. This is fine for most people, but may be disappointing for fast-paced HDR games. This is strange, and we expect it to be reduced in a future firmware update.

New on the C9 is support for Auto Low Latency Mode. See our recommended settings for Gaming.

Update 05/02/2019: We've retested the input lag of the C9 with the firmware update 03.50.31. The input lag measurements in SDR game and PC modes have decreased. We haven't retested 1440p @ 60Hz but we will retest this in the future.

Update 05/09/2019: Text clarifications added.

Update 05/17/2019: We've retested the input lag on the same firmware (03.50.31) and found the 4k @ 60Hz + HDR input lag is in the same ballpark as the other resolutions (around 13ms). We don't know why our previous measurements were higher, as we did confirm them twice. We've also updated the 1440p @ 60Hz input lag with this latest firmware.

9.6 Supported Resolutions
What it is: Different resolutions supported by TV.
When it matters: PC monitor usage.
Score components:
  • 17% 1080p @ 60 Hz @ 4:4:4
  • 8% 1080p @ 120 Hz
  • 8% 1440p @ 60 Hz
  • 4% 1440p @ 120 Hz
  • 34% 4k @ 60 Hz
  • 25% 4k @ 60 Hz @ 4:4:4
  • 4% 8k @ 30 Hz or 24 Hz
1080p @ 60 Hz @ 4:4:4
What it is: Whether the TV can properly display a 1080p @ 60 Hz @ 4:4:4 signal sent from a physical input (HDMI, etc).
When it matters: ClearType text display for PC productivity and gaming with fine text.
:
Yes
1080p @ 120 Hz
What it is: Whether the TV can properly display a 1080p @ 120 Hz signal sent from a physical input (HDMI, etc).
When it matters: Console gaming and PC gaming.
:
Yes (native support)
1440p @ 60 Hz
What it is: Whether the TV can properly display a 1440p @ 60 Hz signal sent from a physical input (HDMI, etc).
When it matters: Gaming and PC use.
:
Yes (forced resolution required)
1440p @ 120 Hz
What it is: Whether the TV can properly display a 1440p @ 120 Hz signal sent from a physical input (HDMI, etc).
When it matters: Console gaming and PC gaming.
:
Yes (native support)
4k @ 60 Hz
What it is: Whether the TV can properly display a 4k @ 60 Hz signal sent from a physical input (HDMI, etc).
When it matters: 4k Blu-rays, gaming, PC use, etc.
:
Yes
4k @ 60 Hz @ 4:4:4
What it is: Whether the TV can properly display a 4k @ 60 Hz @ 4:4:4 signal sent from a physical input (HDMI, etc).
When it matters: ClearType text display for PC productivity and gaming with fine text.
:
Yes
8k @ 30 Hz or 24 Hz
What it is: Whether the TV can properly display an 8k @ 30 Hz or 24 Hz signal sent from a physical input (HDMI, etc).
When it matters: PC use.
:
No
8k @ 60 Hz
What it is: Whether the TV can properly display an 8k @ 60 Hz signal sent from a physical input (HDMI, etc).
When it matters: PC use.
:
No

The LG C9 supports the vast majority of resolutions we test for, including 1440p, which is new this year for LG TVs. Chroma 4:4:4 can be displayed properly with any resolution, as long as PC mode is enabled.

LG advertises that the C9 supports a 4k @ 120Hz input from external devices, but unlike the Samsung Q90R, it appears that this only works with HDMI 2.1 sources, as we were unable to get it to work. We will retest this once we have an HDMI 2.1 source.

Input Photos
Total Inputs
HDMI : 4
USB : 3
Digital Optical Audio Out : 1
Analog Audio Out 3.5mm : 1
Analog Audio Out RCA : 0
Component In : 0
Composite In : 1 (incl. adapter)
Tuner (Cable/Ant) : 1
Ethernet : 1
DisplayPort : 0
IR In : 0
SD/SDHC : 0
Inputs Specifications
HDR10
What it is: Standard HDR format.
When it matters: Most common format. All UHD Blu-ray discs are required to have it.
:
Yes
HDR10+
What it is: Enhanced version of HDR10, adds dynamic metadata like that found in Dolby Vision.
When it matters: When playing HDR10+ content, such as from Amazon Video and some Blu-ray disks.
:
No
Dolby Vision
What it is: Better format, due to its dynamic nature.
When it matters: Dolby Vision mastered content. Current available from streaming services (Netflix, Amazon Video), some Blu-Ray players, the Apple TV 4k and ChromeCast Ultra.
:
Yes
HLG
What it is: HLG or Hybrid Log Gamma is a broadcast HDR format.
When it matters: HLG capable sources such as Youtube or OTA broadcasts in specific regions. Backwards compatible with SDR TVs.
:
Yes
3D
What it is: Optional 3D video capability on TV.
When it matters: 3D movies & videos.
:
No
HDMI 2.0 Full Bandwidth
What it is: HDMI 2.0 is the main used HDMI standard and supports a range of video resolutions and refresh rates up to 4k@60Hz, with a total maximum bandwidth up to 18Gbps.
:
Yes (HDMI 1,2,3,4)
HDMI 2.1
What it is: Whether the manufacturer advertises HDMI 2.1 support.
When it matters: When using an HDMI 2.1 source that takes advantage of its new features.
:
Yes (HDMI 1,2,3,4)
CEC : Yes
HDCP 2.2 : Yes (HDMI 1,2,3,4)
USB 3.0
What it is: USB 3.0 is the latest USB standard which can transfer data up to 5 Gbit/s, and is easily recognizable due to its blue color-coding of the connector.
:
No
Variable Analog Audio Out : Yes
Wi-Fi Support : Yes (2.4 GHz, 5 GHz)

The C9 is advertised to support HDMI 2.1, but with no HDMI 2.1 sources, it isn't currently possible for us to test.

Audio Passthrough
What it is: Whether the specific audio format (ex. Dolby Digital) can be sent by the source, pass through the TV, and be re-sent to an audio sink (such as a receiver) with all its functionality intact.
When it matters: When playing surround sound using a receiver or soundbar, from a source that is connected to the TV.
ARC
What it is: Audio Return Channel (ARC) enables a TV to transmit, via an HDMI cable, audio data to an A/V receiver, without the need for any extra audio cables.
When it matters: When connecting your audio/video receiver directly to your TV via an HDMI cable.
:
Yes (HDMI 2)
eARC support
What it is: Whether the TV supports Enhanced Audio Return Channel (eARC).
When it matters: Passthrough of Dolby Atmos/TrueHD and DTS-HD MA / DTS:X .
:
Yes
Dolby Atmos via TrueHD via eARC
What it is: Whether the TV can receive and pass a Dolby Atmos signal to a receiver via HDMI eARC, when Dolby TrueHD is used as the carrier signal.
When it matters: Blu-rays and video games with Dolby Atmos audio.
:
Yes
DTS:X via DTS-HD MA via eARC
What it is: Whether the TV can receive and pass a DTS:X signal to a receiver via HDMI eARC, when DTS-HD MA is used as the carrier signal.
When it matters: Blu-rays and video games with DTS:X audio.
:
Yes
5.1 Dolby Digital via ARC
What it is: Whether the TV can receive and pass a Dolby Digital 5.1 signal to a receiver via HDMI ARC.
When it matters: 5.1 audio on DVDs, Blu-rays and video games.
:
Yes
5.1 DTS via ARC
What it is: Whether the TV can receive and pass a DTS 5.1 signal to a receiver via HDMI ARC.
When it matters: 5.1 audio on DVDs, Blu-rays and video games.
:
Yes
5.1 Dolby Digital via Optical
What it is: Whether the TV can receive and pass a Dolby Digital 5.1 signal to a receiver via digital optical (Toslink).
When it matters: 5.1 audio on DVDs, Blu-rays and video games.
:
Yes
5.1 DTS via Optical
What it is: Whether the TV can receive and pass a DTS 5.1 signal to a receiver via digital optical (Toslink).
When it matters: 5.1 audio on DVDs, Blu-rays and video games.
:
Yes

The C9 supports eARC when connected to a compatible AV Receiver, which allows it to send higher quality DTS:X and Dolby Atmos via TrueHD sound from an external device to your receiver. Like the 2018 LG OLEDS, it also supports DTS and Dolby Digital passthrough to a standard ARC receiver.

When connected to a PC, the PC detected the C9 as a stereo device, so it wasn't possible to send 5.1 or 7.1 audio to the TV without bypassing the PC's autodetection system.

Update 05/24/2019: Retested the eARC passthrough with a different PC, and no bypassing was necessary: the PC still detected the C9 as a stereo device, but the bitstreaming ignored that fact, and sent 7.1 TrueHD audio without a problem.

7.1

Sound Quality

What it is: How well and accurately the audio is reproduced.
When it matters: When a good and accurate sound reproduction is needed.
Score components:

The LG OLED C9 delivers a decent overall sound quality. This TV gets pretty loud, produces clear dialog, and has a decent amount of punch and body to its bass. However, it can't produce much thump or rumble, and has higher total harmonic distortion than the C8 and B8, especially at max volume. For a better sound, it is recommended to use a dedicated speaker system or soundbar.

7.4 Frequency Response
What it is: How accurately the sound level of each frequency is being produced.
When it matters: For a balanced and neutral sound.
Low-Frequency Extension
What it is: The lowest frequency at which the frequency response reaches -3dB of the target response.
When it matters: Movies, Gaming. Shows how extended the bass is.
Good value: < 60Hz
Noticeable difference: 10Hz
:
67.27 Hz
Std. Dev. @ 70
What it is: The amount of deviation (weighted standard deviation) in frequency response measured at 70dB SPL, as compared to a target response that would sound perfectly balanced to most people.
When it matters: Shows the TV's frequency response at quiet listening levels
Good value: < 4 dB
Noticeable difference: 0.5 dB
:
2.67 dB
Std. Dev. @ 80
What it is: The amount of deviation (weighted standard deviation) in frequency response measured at 80dB SPL, as compared to a target response that would sound perfectly balanced to most people.
When it matters: Shows the TV's frequency response at moderate listening levels
Good value: < 4 dB
Noticeable difference: 0.5 dB
:
2.74 dB
Std. Dev. @ Max
What it is: The amount of deviation (weighted standard deviation) in frequency response measured with the TV at maximum volume, as compared to a target response that would sound perfectly balanced to most people.
When it matters: Shows the TV's frequency response at under maximum load
Good value: < 4 dB
Noticeable difference: 2 dB
:
4.94 dB
Max
What it is: Maximum volume reached by the TV at their optimum viewing distance (size dependent)
When it matters: For listening to loud audio.
Good value: > 88 dB
Noticeable difference: 2 dB
:
87.8 dB SPL
Dynamic Range Compression
What it is: The amount of difference between the TVs frequency response performance at 70dB SPL and Max dB SPL. Too much compression will result in pumping in the sound.
When it matters: When an accurate and free-of-pumping performance is required at higher volumes
Good value: < 3dB
Noticeable difference: 0.5
:
4.00 dB

The LG OLED C9 has a decent frequency response. The low-frequency extension (LFE) is at 67Hz, which is decent, but slightly worse than the C8. This results in a bass that isn't able to produce much thump or rumble but has a decent amount of punch and body. The frequency response above the TV's LFE is well-balanced, which is important for clear dialog. It can also get pretty loud, without too much pumping and compression artifacts under maximum load.

6.0 Distortion
What it is: Deformation of an output signal compared to its input, usually clipping, harmonic distortion, or inter-modulation distortion caused by non-linear behavior of the sound system.
When it matters: When a clean, pure and transparent reproduction is desired.
Score components:
Weighted THD @ 80
What it is: The overall amount of harmonic distortion measured at 80dB SPL. To make the score more perceptually relevant, more weight is given to the higher frequencies.
When it matters: How pure the sound is at moderate listening levels.
Good value: < 0.100
Noticeable difference: 0.100
:
0.263
Weighted THD @ Max
What it is: The overall amount of harmonic distortion measured at the TV's maximum SPL. To make the score more perceptually relevant, more weight is given to the higher frequencies.
When it matters: How pure the sound is at moderate listening levels.
Good value: < 0.100
Noticeable difference: 0.100
:
3.477
IMD @ 80
What it is: The average amount of inter-modulation distortion produced by the TV under maximum load. The percentage shown here is the average result of 3 separate test signals/standards: SMPTE, DIN, & CCIF
When it matters: When a clean and free of aliasing reproduction is desired
Good value: < 5%
Noticeable difference: 2
:
10.58 %
IMD @ Max
What it is: The average amount of inter-modulation distortion produced by the TV under maximum load. The percentage shown here is the average result of 3 separate test signals/standards: SMPTE, DIN, & CCIF
When it matters: When a clean and free of aliasing reproduction is desired
Good value: < 5%
Noticeable difference: 2
:
25.15 %

The LG OLED C9 has a mediocre distortion performance. There is a much higher amount of THD at max volume, but at 80dB it is more reasonable.

8.2

Smart Features

Score components:
  • 42% Interface
  • 2% Ad-Free
  • 37% Apps and Features
  • 16% Remote
  • 3% Remote App
Smart OS : WebOS
Version : 4.5

The LG OLED C9 has very good smart features. The interface hasn't changed much since last year and is still very easy to use, especially with the included remote that can be used as a virtual pointer. There are a few new smart features, including a Home Dashboard feature that can interact with IoT devices, similar to the Samsung SmartThings feature.

8.5 Interface
What it is: The usability, features and performance of the main interface of the TV, not including the interfaces of the apps themselves.
When it matters: Anytime when using the TV, but especially when changing settings and using apps.
Score components: Subjectively assigned
Ease of Use
What it is: How easy the interface is to navigate, affected by the organization of its layout, placing frequently accessed elements in areas that are faster to access, etc.
When it matters: When using the smart features.
:
Easy
Smoothness
What it is: How smooth the interface is to navigate, affected by lag and frame drops.
When it matters: When using the smart features.
:
Average
Time Taken to Select YouTube
What it is: How long it takes to select YouTube for launch, starting from HDMI 1 input, when YouTube is placed first on the list of apps or added as a shortcut. This does not include app launch time, and does not use a fixed YouTube button on a remote. This serves as an indication of the time needed to select any app.
When it matters: When launching any app.
:
2 s
Time Taken to Change Backlight
What it is: The time it takes to navigate to the 'Backlight' setting ('Brightness' on Sony TVs). This serves as an indication of how long it takes to navigate to basic TV settings.
When it matters: When changing TV settings.
:
7 s
Advanced Options
What it is: Whether advanced options and settings are available, such as color calibration.
When it matters: When customizing the TV and using the smart features.
:
Many

The C9 has a very easy to use interface. It is fast, smooth, and we didn't encounter any serious bugs during our testing. Some apps hang a bit when launching them, though.

The interface hasn't changed much from last year's TVs, but there are a few new functions, including a Home Dashboard, which appears to be very similar to Samsung's Smart Things system.

0 Ad-Free
What it is: Whether or not ads can be found on the TV's smart platform.
When it matters: When using the smart features.
Score components:
Ads
What it is: Whether the TV's main interface has ads. This does take into account ads in third-party apps.
When it matters: When using the smart features.
:
Yes
Opt-out
What it is: Whether or not you can opt out of all ads. A TV only passes this test if it allows you to remove them completely, not just disable the personalized advertising.
When it matters: When using the smart features.
:
No
Suggested Content in Home
What it is: Whether suggested content appears in the TV's home menu or main menu. Suggested content can include recommended movies, TV shows, YouTube videos etc.
:
Yes
Opt-out of Suggested Content
What it is: Whether the suggested content feed in the home menu can be removed or hidden
:
No

Although we weren't able to take a picture of them, we did see ads during our testing of the C9, similar to the ads we saw on last year's SK8000. We were able to remove some of them by disabling the Home Promotion setting, but as ads are not always visible, we aren't certain if it is possible to entirely remove them.

8.0 Apps and Features
What it is: The usability, features and performance of apps and other smart features.
When it matters: Only when using smart features such as apps, casting and USB playback.
Score components: Subjectively assigned
App Selection
What it is: The number and variety of apps available to download for the smart platform.
When it matters: When downloading new apps.
:
Many
App Smoothness
What it is: How smooth it feels to navigate the interfaces of apps, affected by lag and frame drops.
When it matters: When using apps.
:
Average
Cast Capable
What it is: Whether apps on a phone or tablet can cast content to the TV.
:
Yes
USB Drive Playback
What it is: Whether the TV can play content from a drive connected to one of the TV's USB ports.
:
Yes
USB Drive HDR Playback
What it is: Whether HDR files played from a USB drive can be displayed properly.
:
Yes
HDR in Netflix
What it is: Whether HDR content on Netflix can be played back in HDR using the native Netflix app.
:
Yes
HDR in YouTube
What it is: Whether HDR content on YouTube can be played in HDR using the native YouTube app.
:
Yes

Like previous LG TVs, the C9 has a great selection of built-in apps. The LG Content Store has one of the widest selections of apps available. If there is a specific app you want us to check for, let us know in the discussions down below!

The C9 also supports WiSA wireless speaker technology, although we didn't test this, and is expected to receive support for Apple HomeKit and AirPlay 2 in a future firmware update.

9.0 Remote
What it is: The usability and features of the TV's physical remote.
Score components: Subjectively assigned
Size
What it is: How big the remote is
:
Large
Voice Control
What it is: The capabilities of the TV's voice control feature
:
Many Features
CEC Menu Control
What it is: Whether the remote can act as a universal remote for HDMI CEC enabled devices. This was tested on our Samsung UBD-K8500 4K Blu-ray player, and may not be valid for other CEC devices as implementations vary by manufacturer.
:
Yes
Other Smart Features
What it is: Whether the remote has any other smart features, such as a pointer, universal remote support for non HDMI CEC devices, etc.
:
Yes

The remote is extremely similar to last year's model but has a few added features. It is now possible to program the remote to work as a universal remote, with other devices over IR, which is great if they don't support HDMI-CEC. This is very similar to Samsung's OneRemote feature.

Like with past LG TVs, the remote can be used as a mouse pointer, which makes the interface extremely easy to navigate. You can also navigate the interface using the directional buttons if you prefer.

7.0 Remote App
What it is: The features of the official phone and tablet app for the TV.
Score components: Subjectively assigned
Acts as the Remote
What it is: Whether the remote app can emulate all the buttons of the physical remote.
:
Yes
Directly Launches Apps and Inputs
What it is: Whether the remote app can directly launch the TV's apps and change between its inputs, without requiring any interaction with menus on the TV.
:
Both
Inputs Text in YouTube
What it is: Whether the remote app can enter text for YouTube searches.
:
No
Inputs Text in Netflix
What it is: Whether the remote app can enter text for Netflix searches.
:
No
Streams Device Files
What it is: Whether the remote app can stream files from the phone or tablet to the TV, files such as pictures, music and video.
:
Yes
Controls TV Settings
What it is: Whether the app can change all or some of the settings on the TV, such as the backlight.
:
No
Voice Control
What it is: Whether the remote can send voice commands to the TV.
:
Limited Support

The remote app hasn't been improved since we tested the 2018 LG OLEDs. It still only allows for very basic control of the TV, and it allows for very basic voice searches.

TV Controls

The controls are very different from the LG C8, and may seem less intuitive to some users. The C8 has a joystick located on the back side of the TV, whereas the C9 uses a fixed button located in the center of the TV that isn't as useful. The stand had to be removed to take this picture.

In The Box

  • Basic user manual
  • Remote
  • Cable management strap
  • Composite breakout adapter
  • Batteries
  • Panel cover
  • Not Shown: Power cable

Misc
Power Consumption : 89 W
Power Consumption (Max) : 171 W
Firmware : 03.50.22

Differences between Sizes and Variants

We tested the 55" C9 (OLED55C9PUA), and we expect our results to be valid for the 65" (OLED65C9PUA), and the 77" (OLED77C9PUA) models as well.

If someone comes across a different type of panel or if their LG C9 doesn't correspond to our review, let us know and we will update the review. Note that some tests such as the gray uniformity may vary between individual units.

Size Short Model Code US Model EU Model Notes
55" OLED55C9 OLED55C9PUA OLED55C9PLA  
65" OLED65C9 OLED65C9PUA OLED65C9PLA  
77" OLED77C9 OLED77C9PUB OLED77C9PLA  

The C9 we reviewed was manufactured in March 2019.

Compared to other TVs

Top left: Samsung Q8FN (QN55Q8FN). Bottom left: LG C8 (OLED55B8). Middle: LG C9 (OLED55C9). Top right: Sony Z9F (XBR65Z9F). Bottom right: Sony A9F (XBR55A9F). Unlike our other photographs, this picture wasn't taken under a controlled environment, so do not draw conclusions from it.

The C9 is an excellent OLED TV and outperforms most similarly-priced LED models. See our recommendations for the best OLED TVs and the best smart TVs.

LG C8 OLED
55" 65" 77"

The LG C9 and LG C8 OLED are extremely similar overall. The C9 we tested had less temporary image retention, but this varies between units, and might not be indicative of the full lineup. The biggest difference between these TVs is the inputs. The C9 has 4 HDMI 2.1 inputs, which for the moment, doesn't add much, if anything at all. Once there are HDMI 2.1 sources, the C9 should support a 4k @ 120 Hz input, even at full chroma. The C9 also supports eARC and supports the HDMI 2.1 variable refresh rate technology, which is currently only supported by the Xbox One.

Sony A9G OLED
55" 65" 77"

The LG C9 OLED is slightly better than the Sony A9G. The LG has a lower input lag, which is great for gamers, and supports HDMI Forum VRR for nearly tear-free gaming. The C9 can also get brighter in SDR which, however, isn't that noticeable and could be due to panel variance.

LG B8 OLED
55" 65"

The LG B8 OLED and the LG C9 OLED deliver very similar picture quality overall. The C9 supports some great new features, including HDMI 2.1, eARC, and HDMI Forum's variable refresh rate technology. Although all of these features don't add much now, they do make the C9 a slightly more future-proof choice.

Sony A9F OLED
55" 65"

The Sony A9F OLED and the LG C9 are both OLED TVs, and they perform almost identically. The LG C9 is a bit brighter and has slightly less input lag. Although the Sony A9F supports eARC, the LG C9 supports the extra bandwidth of HDMI 2.1 on all four HDMI inputs. Although this doesn't add anything at the moment, once there are HDMI 2.1 sources on the market, this should allow the C9 to accept a 4k @ 120Hz signal, even with a 10 bit, full chroma signal.

LG E8 OLED
55" 65"

The LG E8 and C9 deliver very similar picture quality, thanks to their impressive OLED panels. The C9 is slightly better, though, especially as a future-proof model. The C9 supports HDMI 2.1 on all HDMI ports, and supports many new features, including HDMI Forum's variable refresh rate technology, as well as eARC.

Samsung Q90/Q90R QLED
65" 75" 82"

The Samsung Q90/Q90R and the LG C9 use different panel types, each with their own advantages and disadvantages. The C9 looks much better in a dark room, as the OLED panel delivers a nearly infinite contrast ratio and near-perfect black uniformity. The Q90R is significantly brighter, and the brightness doesn't change as much with different content (ABL). The C9 has better gray uniformity and better viewing angles. The C9 has a risk of permanent burn-in when exposed to static content, but the Q90 does not.

Sony A8G OLED
55" 65"

The LG C9 OLED is a bit better than the Sony A8G. The C9 supports many new technologies, including HDMI 2.1 on all four HDMI ports, as well as eARC, and HDMI Forum's new variable refresh rate technology, great for Xbox One gamers. The C9 also has significantly less input lag, which is great for gaming or for use as a PC monitor.

Samsung Q80/Q80R QLED
55" 65" 75" 82"

These are two different types of TVs, each with its advantages and disadvantages. The LG C9 is an OLED TV that delivers an outstanding dark room performance thanks to its perfect blacks. The C9 has wider viewing angles and delivers motion with almost no blur, thanks to the nearly instantaneous response time. The Samsung Q80R does not have the burn-in risk of the OLEDs and can get brighter, which is great for a bright room. Finally, the Samsung Q80R has low input lag with motion interpolation.

Sony A8F OLED
55" 65"

The LG C9 and the Sony A8F OLED are both OLED TVs and perform very similarly, but the C9 is slightly better overall. The C9 has lower input lag, great for gamers or for use as a PC monitor. The C9 also supports some newer technologies, including HDMI 2.1 on all four inputs, eARC, and the HDMI 2.1 variable refresh rate technology. Although some of these features don't add much for now, as there are no sources available, it does make the C9 a more future-proof choice.

Sony X950G
55" 65" 75" 85"

The Sony X950G and the LG C9 use different panel types, each with their own strengths and weaknesses. The C9 delivers the best dark room performance and has a nearly instantaneous response time, which results in extremely clear motion. Unfortunately, this also comes with a risk of permanent burn-in, which the Sony X950G is immune to. The X950G can get a lot brighter than the C9, especially when displaying large, bright scenes.

Vizio P Series Quantum X 2019
65" 75"

The LG C9 and the Vizio P Series Quantum X use different panel types, each with their own strengths and weaknesses. The C9 is better for a dark room, and it has incredibly wide viewing angles. The C9 also has a nearly-instantaneous response time, outstanding low input lag, and some great future-proof features, like 4 HDMI 2.1 ports. As an OLED TV, the C9 does have a risk of permanent burn-in. The Quantum X, on the other hand, is much brighter, and small highlights in HDR movies look much closer to what the director intended. There is also no chance of burn-in with the Quantum X.

Sony Z9F
65" 75"

The Sony Z9F and LG C9 use different panel technologies, each with their own advantages and disadvantages. The Z9F uses a VA panel and is much brighter than the C9, and the brightness doesn't change as much with different content (ABL). The C9 looks much better in a dark room, as the OLED panel delivers near-perfect black uniformity and an infinite contrast ratio. The C9 has a nearly instantaneous response time, but this results in more noticeable stutter when watching movies. The C9 also has a chance of permanent burn-in when exposed to static content, but the Z9F is immune to burn-in.

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Conclusion
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9.0 Mixed Usage
What it is: General purpose. The TV will be used for a variety of content and usages. Movies at night, TV shows during the day, video games from time to time, etc.
Score components:
The C9 OLED is an outstanding TV for most uses. The OLED panel produces excellent picture quality for most uses, with perfect blacks and wide viewing angles. It has a nearly instantaneous response time, which is important for gaming or for use as a PC monitor. Unfortunately, there is a risk of burn-in, and the brightness of the screen changes with different content, which may be distracting.
9.3 Movies
What it is: Movies in the dark. The TV will be used for watching movies in a controlled environment, directly in front, in a home theater way. Mostly only high quality content, like Blu-rays, UHD Blu-rays, streaming and a little bit of HDR.
Score components:
The C9, like all OLED TVs, is an outstanding TV for watching movies. The OLED panel delivers perfect blacks, great for dark room viewing, without the need for a local dimming system. This also allows for perfect black uniformity, with no halos around bright objects, great if you watch subtitled movies. The C9 also has a nearly instantaneous response time, which unfortunately results in higher levels of stutter, especially when watching 24p movies.
8.6 TV Shows
What it is: TV Shows in a bright living room. The TV will be used in to watch TV shows, in a bright room during the day, from multiple viewing positions at different angles. The content watched has an average quality: cable, streaming, SD channels, etc.
Score components:
The LG OLED C9 is an excellent TV for watching TV shows during the day. It has good peak brightness and an impressive anti-reflective coating, so you shouldn't have any issues, even in a bright room. It also has wide viewing angles, which is great if you like to walk around with the TV on.
8.8 Sports
What it is: Sports in a living room. The TV will be used to watch sports during the day, like football or hockey. Usually watched with a group, so from multiple viewing position.
Excellent TV for watching sports. It has wide viewing angles and an outstanding anti-reflective coating, great for watching the big game with a group of friends. It has a nearly instantaneous response time, which results in a clear image with no noticeable blur trail behind fast moving objects.
9.4 Video Games
What it is: Video games. The TV will be used to play video games, directly in front, in a controlled light environment. Usually fast games, like online FPS, where motion blur and input lag is important.
Outstanding TV for playing video games. It has a nearly instantaneous response time, so fast-moving objects have no blur trail behind them, and it has excellent low input lag for a responsive gaming experience. The C9 also supports VRR for a smoother gaming experience with less tearing, but for the moment this is only supported on the Xbox One.
9.1 HDR Movies
What it is: HDR Movies and TV shows. The TV will be used to watch 4k UHD HDR content, with a wide color gamut and a high peak brightness. Either via UHD Blu-rays or HDR streaming.
Score components:
The C9 is an excellent TV for watching movies in HDR. The OLED panel produces perfect blacks, it has a wide color gamut, and good peak brightness in HDR. Unfortunately, the TV's automatic brightness limiter (ABL) causes the brightness to fluctuate with different content, which may bother some people.
9.1 HDR Gaming
What it is: HDR Gaming. The TV will be used to play HDR video games using consoles that support it or on current generation gaming PCs. Xbox One S, PS4 Pro, GTX 10 series and AMD RX series graphics cards.
Excellent TV for gaming in HDR. It has excellent gaming performance, thanks to the nearly instantaneous response time and low input lag. It has an excellent wide color gamut and good peak brightness in HDR. The brightness changes with different content, though, and this might bother some people, especially with really bright games. There is also a possibility of burn-in, which might be an issue due to the static elements found in most games.
8.7 PC Monitor
What it is: PC Monitor. The TV will be used as a PC monitor, from 2-3 feet away, either for productivity purposes or gaming. Sharp text is important, as well as a high resolution.
Score components:
The LG OLED C9 is an excellent TV to use as a PC monitor, but there is a chance of burn-in with long exposure to static elements, so it is best to set up your computer to avoid static elements as much as possible. The C9 has excellent wide viewing angles, and it has an excellent response time and low input lag, so it feels very responsive when working.

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