LG GX OLED TV Review

Tested using Methodology v1.5
Reviewed Sep 17, 2020 at 08:12 am
LG GX OLED Picture
8.8
Mixed Usage
Value for price beaten by
: LG BX OLED
9.4
Movies
8.2
TV Shows
8.7
Sports
9.1
Video Games
8.7
HDR Movies
8.7
HDR Gaming
8.7
PC Monitor
Type OLED
Sub-Type
WRGB
Resolution 4k

The LG GX is a new TV in LG's 2020 lineup with a unique 'Gallery' design. It's a very thin TV that comes with a wall-mount instead of a stand, and it's meant to sit flush against the wall. Picture quality is excellent; like any OLED, it can individually dim pixels, resulting in an infinite contrast ratio and perfect black uniformity. It displays a wide color gamut for HDR content, but it has an aggressive Automatic Brightness Limiter, so large areas aren't bright. It has variable refresh rate (VRR) support, a near-instant response time, a Black Frame Insertion feature, and low input lag for gaming. Unfortunately, like any OLED, it has the risk of permanent burn-in, which can be an issue if you watch content with static elements all the time, like the news, but it shouldn't pose too much of a problem if you watch varied content. Lastly, it has wide viewing angles, which is great for wide seating arrangements.

NoteWe bought the optional stand with the TV for testing and didn't use the included wall-mount. We've read reports of people having a hard time setting up the TV, but this isn't something we test for. If you experience any issues, let us know in the discussions. If you don't plan on wall-mounting it, the LG CX OLED is a very similar TV that comes with a stand and costs less.

Our Verdict

8.8 Mixed Usage

The LG GX OLED is an amazing all-around TV. It's an ideal choice for watching movies in a dark room because of its nearly infinite contrast ratio and perfect black uniformity. Gamers should enjoy the 120Hz refresh rate, VRR support, near-instant response time, and low input lag. It also has wide viewing angles if you want to watch the big game in a wide seating arrangement. Unfortunately, it has the risk of permanent burn-in, so it's not ideal to use as a PC monitor because of the static elements of most user interfaces.

Pros
  • Nearly infinite contrast ratio.
  • Wide viewing angles.
  • Near-instant response time.
  • VRR support.
Cons
  • Aggressive Automatic Brightness Limiter (ABL).
  • Risk permanent burn-in.
9.4 Movies

The LG GX OLED is an incredible TV for watching movies. It has a nearly infinite contrast ratio and perfect black uniformity, so movies in a dark room look amazing. It upscales lower-resolution content well, and it removes 24p judder from any source. Sadly, because this TV has a near-instant response time, lower frame rate content may appear to stutter.

Pros
  • Nearly infinite contrast ratio.
  • Perfect black uniformity.
  • Removes 24p judder.
  • Upscales 720p and 1080p content well.
Cons
  • Low frame rate content may appear to stutter.
8.2 TV Shows

Great for TV shows. The LG GX has very wide viewing angles, great if you walk around while watching your favorite show. It has outstanding reflection handling but may not get bright enough to combat glare in well-lit environments. It upscales lower-resolution content, such as from cable boxes, without any problems. Unfortunately, it has the risk of permanent burn-in, which may be an issue if you constantly watch content with static elements, like the news.

Pros
  • Upscales 720p and 1080p content well.
  • Wide viewing angles.
  • Outstanding reflection handling.
Cons
  • Aggressive Automatic Brightness Limiter (ABL).
  • Risk permanent burn-in.
8.7 Sports

The LG GX is excellent for watching sports. It has a near-instant response time, resulting in minimal motion blur, and it has wide viewing angles if you want to watch the game with a large group of friends. It performs well in bright rooms because it has outstanding reflection handling, but it doesn't get bright enough to combat a lot of glare. Our unit has a uniform screen with no dirty screen effect, but this may vary between units.

Pros
  • Wide viewing angles.
  • Outstanding reflection handling.
  • Near-instant response time.
Cons
  • Aggressive Automatic Brightness Limiter (ABL).
9.1 Video Games

Outstanding for video games. The LG GX has a 120Hz refresh rate and VRR support to reduce screen tearing. Its response time is near-instant and it has a Black Frame Insertion feature. Input lag is also incredibly low. Also, it's amazing for dark-room gaming because of its nearly infinite contrast ratio. Sadly, it has the risk of permanent burn-in if you constantly play video games with an interface that has a lot of static elements, but we don't expect this to be an issue for most people.

Pros
  • Near-instant response time.
  • Low input lag.
  • VRR support.
Cons
  • Risk permanent burn-in.
8.7 HDR Movies

Excellent for HDR movies. The LG GX has an infinite contrast ratio, displaying extremely deep blacks, and it has perfect black uniformity. It displays a wide color gamut for HDR, but it may not get bright enough in HDR to truly bring out highlights. Lower frame rate content may appear to stutter because of its near-instant response time. However, it can remove 24p judder from any source.

Pros
  • Nearly infinite contrast ratio.
  • Perfect black uniformity.
  • Removes 24p judder.
  • Displays wide color gamut.
Cons
  • Aggressive Automatic Brightness Limiter (ABL).
  • Risk permanent burn-in.
8.7 HDR Gaming

The LG GX is excellent for HDR gaming. It's packed with gaming features like VRR support, near-instant response time, and low input lag. HDR content looks good because it displays a wide color gamut, but it doesn't get very bright in that mode to truly make highlights stand out. Due to this TV's nearly infinite contrast ratio, it displays perfect blacks, great for dark-room gaming.

Pros
  • Nearly infinite contrast ratio.
  • Near-instant response time.
  • Low input lag.
  • Displays wide color gamut.
Cons
  • Aggressive Automatic Brightness Limiter (ABL).
  • Risk permanent burn-in.
8.7 PC Monitor

The LG GX is an excellent choice to use as a PC monitor. It has wide viewing angles, low input lag, and near-instant response time. It also displays chroma 4:4:4, which is important for reading text. Sadly, it has the risk of permanent burn-in, so static elements from a computer's interface may damage the screen over time, but this shouldn't be a problem if you watch varied content.

Pros
  • Wide viewing angles.
  • Outstanding reflection handling.
  • Low input lag.
Cons
  • Aggressive Automatic Brightness Limiter (ABL).
  • Risk permanent burn-in.
  • 8.8 Mixed Usage
  • 9.4 Movies
  • 8.2 TV Shows
  • 8.7 Sports
  • 9.1 Video Games
  • 8.7 HDR Movies
  • 8.7 HDR Gaming
  • 8.7 PC Monitor

Test Results

perceptual testing image
Market Context
Market Context
Market Context

The LG GX OLED is a high-end TV in LG's OLED lineup. It's a new TV in 2020 and it sits right below the LG WX, which is an even thinner TV that comes with an external box instead of having the inputs on the TV. Its main competitors are the LG CX OLED, the Sony A8H OLED, and the Samsung The Frame 2020.

Design
9.5
Design
Style
Curved No

The LG GX has an incredible design. It's very thin and the TV has a uniform thickness throughout. There are tapered edges where the front and back panels meet, which allows the TV to sit flush against the wall when wall-mounted, making it look like a picture frame. It comes with LG's Flush Wall Mount, and you can buy feet separately if you don't want to wall-mount it.

Design
Stand

LG sells feet you can buy separately for this stand, which is what we did, and they hold the TV well. If you don't plan on wall-mounting it, then consider the LG CX OLED, which is a very similar TV that's cheaper and it comes with a stand.

Footprint of the 55" stand: 45.4" x 10.7".

Design
Back
Wall Mount VESA 300x300

The back of this TV is made out of metal. In the photo, there's a cover where the dedicated wall-mount goes, and you can also VESA-mount it if you choose. There's an L-shaped panel covering the inputs and it allows you to route wires to the center of the TV if you wall-mount it. There's also cable management through the optional feet.

Design
Borders
Borders 0.35" (0.9 cm)

The borders are thin and aren't distracting.

Design
Thickness
Max Thickness 0.94" (2.4 cm)

The LG GX is very thin and won't stick out when wall-mounted. It's even thinner than the Samsung The Frame 2020.

9.5
Design
Build Quality

Incredible build quality. The LG GX is extremely well-made with a unique design. The back is mainly made out of metal that doesn't flex much and there aren't any visible build quality issues.

Picture Quality
10
Picture Quality
Contrast
Native Contrast
Inf : 1
Contrast with local dimming
N/A

Like all OLED TVs, the LG GX has an infinite contrast ratio since it can turn off individual pixels, resulting in perfect blacks.

10
Picture Quality
Local Dimming
Local Dimming
No
Backlight
No Backlight

Since this TV doesn't have a backlight, it doesn't have a local dimming feature. It can dim pixels individually, so bright objects and subtitles are displayed perfectly, with no visible blooming.

6.7
Picture Quality
SDR Peak Brightness
SDR Real Scene Peak Brightness
292 cd/m²
SDR Peak 2% Window
388 cd/m²
SDR Peak 10% Window
393 cd/m²
SDR Peak 25% Window
358 cd/m²
SDR Peak 50% Window
301 cd/m²
SDR Peak 100% Window
177 cd/m²
SDR Sustained 2% Window
369 cd/m²
SDR Sustained 10% Window
373 cd/m²
SDR Sustained 25% Window
340 cd/m²
SDR Sustained 50% Window
287 cd/m²
SDR Sustained 100% Window
168 cd/m²
SDR ABL
0.051

The LG GX has okay peak brightness. It gets bright enough to combat glare in moderately-lit rooms, but it may not be good enough for a bright environment. Because of its aggressive Automatic Brightness Limiter (ABL), its brightness isn't very consistent across different content and it quickly becomes dim with large, bright areas.

We measured peak brightness before calibration, although we normally take the results after calibration. This is because calibrating the TV significantly improved the 100% peak window up to 269 cd/m², while the other results only slightly improved by one or two nits. Since calibration changes per unit, not every TV would get brighter like ours, and some may get dimmer.

We measured the SDR peak brightness in the 'Expert (Dark Room)' Picture Mode with OLED Light at its max and Peak Brightness setting on 'High'. We got the brightest image possible with these settings, as seen in the 10% peak window test.

7.0
Picture Quality
HDR Peak Brightness
HDR Real Scene Peak Brightness
662 cd/m²
HDR Peak 2% Window
746 cd/m²
HDR Peak 10% Window
744 cd/m²
HDR Peak 25% Window
432 cd/m²
HDR Peak 50% Window
285 cd/m²
HDR Peak 100% Window
139 cd/m²
HDR Sustained 2% Window
711 cd/m²
HDR Sustained 10% Window
712 cd/m²
HDR Sustained 25% Window
409 cd/m²
HDR Sustained 50% Window
270 cd/m²
HDR Sustained 100% Window
133 cd/m²
HDR ABL
0.104

Decent brightness in HDR. This TV gets bright enough to bring out small highlights in HDR. However, like in SDR, it quickly loses its brightness as large, bright areas cover the screen because of its aggressive ABL.

We measured HDR peak brightness in the 'HDR Cinema' Picture Mode with OLED Light at its max, Peak Brightness set to 'High', and Color Temperature set to 'Warm 2'.

If you want the brightest image possible, set the Picture Mode to 'HDR Vivid' with its default settings.

8.7
Picture Quality
Gray Uniformity
50% Std. Dev.
1.113 %
50% DSE
0.134 %
5% Std. Dev.
0.279 %
5% DSE
0.064 %

The LG GX has excellent gray uniformity. There's very minor dirty screen effect in the center, but it shouldn't be distracting during sports. However, like most OLED TVs, there are faint vertical and horizontal lines that may be visible in near-dark scenes.

Note: Gray uniformity may vary between units.

9.0
Picture Quality
Viewing Angle
Color Washout
48 °
Color Shift
34 °
Brightness Loss
69 °
Black Level Raise
70 °
Gamma Shift
70 °

The LG GX has outstanding wide viewing angles. The image remains accurate when viewing at an angle, so it's ideal for wide seating arrangements.

10
Picture Quality
Black Uniformity
Native Std. Dev.
0.155 %
Std. Dev. w/ L.D.
N/A

Since this OLED TV can turn off individual pixels, black uniformity is perfect.

9.3
Picture Quality
Reflections
Screen Finish
Glossy
Total Reflections
1.5 %
Indirect Reflections
0.1 %
Calculated Direct Reflections
1.4 %

Just like the LG CX OLED, the LG GX has outstanding reflection handling. You shouldn't have any issues placing this opposite a window.

6.9
Picture Quality
Pre Calibration
White Balance dE
4.17
Color dE
3.17
Gamma
2.20
Color Temperature
6306 K
Picture Mode
Expert (Dark Room)
Color Temp Setting
Warm 2
Gamma Setting
2.2

Decent out-of-the-box color accuracy. Most colors are slightly inaccurate and white balance is off, which affects shades of gray. The color temperature is slightly warm and for the most part, gamma follows the target curve well, except extremely bright scenes may be too dark.

We had to calibrate the TV twice because we had difficulty calibrating the 5% and 10% gray stimulus levels while being connected to HDMI 1. We calibrated it again through HDMI 2, so these results are taken from HDMI 2. The color accuracy only slightly improved and you can see our original results from HDMI 1 here:

Note: Color accuracy may vary between units.

9.4
Picture Quality
Post Calibration
White Balance dE
0.14
Color dE
1.53
Gamma
2.21
Color Temperature
6508 K
White Balance Calibration
22 point
Color Calibration
Yes
Auto-Calibration Function
Yes

After calibration, color accuracy is almost perfect. Any remaining inaccuracies are almost impossible to spot with the naked eye and the color temperature is extremely close to the 6500K target.

We originally calibrated the LG GX through HDMI 1. While trying to calibrate the 10% gray stimulus, it heavily affected the 5% gray stimulus to the point where the screen looked blue. This made it difficult to get a proper image post-calibration. We recalibrated it a second time on HDMI 2, and even though it slightly decreased the final score, it resulted in a better final image. You can see our original results here:

You can see our recommended settings here.

8.0
Picture Quality
480p Input

This TV upscales 480p content well, with no obvious upscaling artifacts.

8.0
Picture Quality
720p Input

The LG GX upscales 720p content, such as from cable boxes, without any issues.

9.0
Picture Quality
1080p Input

1080p content looks almost as good as native 4k content.

10
Picture Quality
4k Input

The LG GX displays 4k content without any issues. Even though it has an RGBW pixel structure, all four sub-pixels are never on at the same time, so there's no loss in color resolution.

0
Picture Quality
8k Input

The LG GX is a 4k TV that can't display an 8k signal.

Picture Quality
Pixels

The LG GX has an RGBW pixel structure, but all four pixels are never used at the same time. The image above shows the white, blue, and green subpixels. You can see alternate pixel pictures here: Photo 1 and Photo 2. This pixel structure isn't ideal for use as a PC monitor because it affects the way text is displayed.

8.5
Picture Quality
Color Gamut
Wide Color Gamut
Yes
DCI P3 xy
96.27 %
DCI P3 uv
98.00 %
Rec 2020 xy
70.95 %
Rec 2020 uv
75.21 %

Excellent color gamut. This TV has near-perfect coverage of the DCI P3 color space used in most HDR content and decent coverage of the wider Rec. 2020 color space.

The EOTF follows the target curve fairly well until it rolls off at its peak brightness. The EOTF in 'Game' mode is almost the exact same.

If you find HDR too dim, enable Dynamic Tone Mapping and set Dynamic Contrast to 'Medium'. It resulted in a bit brighter image, as you can see in this EOTF.

7.0
Picture Quality
Color Volume
Normalized DCI P3 Coverage ITP
79.2 %
10,000 cd/m² DCI P3 Coverage ITP
42.9 %
Normalized Rec 2020 Coverage ITP
60.6 %
10,000 cd/m² Rec 2020 Coverage ITP
32.8 %

Okay color volume. Thanks to its nearly infinite contrast ratio, it displays deep, saturated colors well. However, it struggles to display brighter colors.

7.9
Picture Quality
Gradient
Color Depth
10 Bit
Red (Std. Dev.)
0.096 dE
Green (Std. Dev.)
0.123 dE
Blue (Std. Dev.)
0.099 dE
Gray (Std. Dev.)
0.123 dE

Good gradient handling, but it's not as good as the LG CX OLED. There's noticeable banding in grays and greens and a bit in reds and blues. Setting Smooth Gradation to 'High' helps smooths out gradients in real content, but it didn't affect the test pattern. Setting it to 'Medium' or 'Low' doesn't affect the gradients all that much.

10
Picture Quality
Temporary Image Retention
IR after 0 min recovery
0.00 %
IR after 2 min recovery
0.00 %
IR after 4 min recovery
0.00 %
IR after 6 min recovery
0.00 %
IR after 8 min recovery
0.00 %
IR after 10 min recovery
0.00 %

The LG GX doesn't have any temporary image retention, even after displaying a high-contrast static image for 10 minutes.

Note: Temporary image retention may vary between units.

2.0
Picture Quality
Permanent Burn-In Risk
Permanent Burn-In Risk
Yes

Unfortunately, like most OLED TVs, the LG GX isn't immune to permanent burn-in. However, we don't expect people who watch varied content to have any issues, but rather it's a problem if there are constant static displays, like if it's used as a PC monitor.

This TV has three features to help burn-in risk. Enabling Screen Shift option, and setting Logo Luminance Adjustment to 'Low' may help with this. There's also an Automatic Pixel Refresher that can be run manually if needed.

You can read about our investigation into this here.

Motion
9.8
Motion
Response Time
80% Response Time
0.2 ms
100% Response Time
2.3 ms

The LG GX has a near-instant response time. There's a bit of overshoot in dark transitions, which may lead to motion artifacts in dark scenes, but for the most part, motion looks very smooth.

10
Motion
Flicker-Free
Flicker-Free
No
PWM Dimming Frequency
0 Hz

There's a slight dip in brightness every 8 ms, which coincides with the 120Hz refresh rate and isn't noticeable.

10
Motion
Black Frame Insertion (BFI)
Optional BFI
Yes
Min Flicker for 60 fps
60 Hz
60 Hz for 60 fps
Yes
120 Hz for 120 fps
Yes
Min Flicker for 60 fps in Game Mode
60 Hz

The LG GX has a Black Frame Insertion feature that helps improve the appearance of motion. For it to flicker at 60Hz for 60fps content, set TruMotion to 'User' and OLED Motion to 'High'. It always flickers at 120Hz for 120fps content if you have TruMotion enabled with OLED Motion on any setting. The BFI feature doesn't look as good with 120fps content as it does with 60fps content (above photo) and the crosstalk is bad, so there may be some motion artifacts.

Motion
Motion Interpolation
Motion Interpolation (30 fps)
Yes
Motion Interpolation (60 fps)
Yes

The LG GX can interpolate lower frame rate content up to 120fps, which is known as the 'Soap Opera Effect'. It does a good job at smoothing out motion and it doesn't stop interpolating even in busy scenes, but this may lead to artifacts with fast-moving content. However, the artifacts are hard to notice and not too distracting.

See here for the settings that control the motion interpolation feature.

5.0
Motion
Stutter
Frame Hold Time @ 24 fps
39.4 ms
Frame Hold Time @ 60 fps
14.4 ms

Due to the TV's very quick response time, there's noticeable stutter with lower frame rate content because each frame is held on longer. Enabling the motion interpolation feature can help reduce this issue.

10
Motion
24p Judder
Judder-Free 24p
Yes
Judder-Free 24p via 60p
Yes
Judder-Free 24p via 60i
Yes
Judder-Free 24p via Native Apps
Yes

The LG GX removes 24p judder from any source, as long as Real Cinema is enabled. It can remove judder from 24p content with OLED Motion set to 'Auto', 'Low', or 'Medium'. However, it doesn't remove judder with OLED Motion set to 'High' becauses the backlight flickers at 60Hz. With 60p content, you have to set OLED Motion on 'Medium' or 'Auto' because 'Low' doesn't remove judder completely.

7.9
Motion
Variable Refresh Rate
Native Refresh Rate
120 Hz
Variable Refresh Rate
Yes
HDMI Forum VRR
Yes
FreeSync
Yes
G-SYNC Compatible
Yes (NVIDIA Certified)
4k VRR Maximum
120 Hz
4k VRR Minimum
40 Hz
1080p VRR Maximum
120 Hz
1080p VRR Minimum
40 Hz
1440p VRR Maximum
120 Hz
1440p VRR Minimum
40 Hz
VRR Supported Connectors
HDMI

The LG GX supports variable refresh rate technologies to reduce screen tearing. With an Xbox One S connected to the TV, we disabled the FreeSync setting and enabled the G-SYNC setting. The Xbox showed VRR was still working, so we were able to confirm the TV supports HDR Forum VRR.

Find out more about the VRR settings here.

Inputs
8.8
Inputs
Input Lag
1080p @ 60 Hz
13.6 ms
1080p @ 60 Hz Outside Game Mode
97.1 ms
1440p @ 60 Hz
13.5 ms
4k @ 60 Hz
13.6 ms
4k @ 60 Hz + 10 bit HDR
13.6 ms
4k @ 60 Hz @ 4:4:4
13.6 ms
4k @ 60 Hz Outside Game Mode
97.0 ms
4k @ 60 Hz With Interpolation