Reviewed on Feb 21, 2018 , Ian Cumming, Mehdi Azzabi, Martin Leduc, Eric Bousquet

LG 27UD68-P
MONITOR REVIEW

Usage Ratings - Version 1.0
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Test Benches: test

  • 1.0: Fall 2017
7.6
Mixed Usage
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Score components:
  • 30% Office
  • 30% Multimedia
  • 25% Gaming
  • 10% Media Creation
  • 5% HDR Gaming
Size : 27 "
Resolution : 3840x2160
Refresh Rate : 60 Hz
LCD Type
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What it is: Type of LCD technology used by the monitor.
When it matters: Different technologies have different viewing angle properties.
:
IPS

The LG 27UD68P-B is a good IPS monitor with a UHD resolution and a wide viewing angle. It has decent picture quality, and it features a narrow bezel making it a good choice for a multiple monitor setup. It gets sufficiently bright, and the 27UD68P-B's well-rounded set of features make it quite versatile. Unfortunately, its very cloudy blacks and low contrast ratio means its picture quality greatly suffers in a dark room.

Test Results
Design 8.0
Picture Quality 6.7
Motion 7.9
Inputs 9.0
Pros
  • 4k resolution gives lots of desktop space
  • Picture quality isn't reduced from minor position changes
Cons
  • Poor picture quality in a dark room
  • Static images are sometimes retained for a few minutes

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Black 27UD68P-B
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Amazon.com
White 27UD68-W
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Amazon.com
8.0

Design

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Score components: Subjectively assigned
LG 27UD68P-B Design Picture
Curved : No
Curve radius : N/A
Weight (without stand) : 10.0lbs (4.5 kg)
Weight (with stand) : 12.6lbs (5.7 kg)

The design of the LG 27UD68-P is great. The monitor looks good and is very practical. It is possible to mount it on a stand with a VESA 100 fitting, and on the supplied stand the ergonomic adjustments are good. The monitor feels quite well built too.

Stand
LG 27UD68P-B Stand picture
Width : 19.9" (50.5 cm)
Depth : 9.4" (23.8 cm)

The stand is quite sturdy and supports the monitor well. It has a fairly large footprint for the monitor's size, but this shouldn't be a problem on most tables.

6.7 Ergonomics
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What it is: How much the position of the screen can be adjusted to match the viewing preference of the user.
When it matters: All usages, but especially office and gaming use.
Score components:
  • 45% Height Adjustment
  • 18% Switch portrait/landscape
  • 18% Swivel Range
  • 18% Tilt Range
LG 27UD68P-B Ergonomics picture
Height Adjustment : 4.8" (12.2 cm)
Switch portrait/landscape : Yes
Swivel Range : N/A
Tilt Range : -20° to 5°

The stand has a few ergonomic adjustment features but is missing some others. The height can be adjusted over a wide range, but it can't go as high as some other monitors. The monitor's tilt range is large enough to suit nearly any usage, but the stand can't swivel without dragging across the table.

Back
LG 27UD68P-B Back picture
Wall Mount : Vesa 100x100

The back of the LG 27UD68-P monitor is glossy plastic and looks good, but does attract fingerprints. There is a clip for cable management visible here.

Borders
LG 27UD68P-B Borders picture
Borders : 0.4" (0.9 cm)

The borders of the 27UD68P-B are fairly thin, and there is no raised brim around the screen except for the bottom.

Thickness
LG 27UD68P-B Thickness picture
Thickness (with stand) : 5.7" (14.6 cm)
Thickness (without stand) : 1.5" (3.8 cm)

The monitor is fairly thin without the stand, but with the stand, it has an average thickness.

6.5 Build Quality
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What it is: How well built and sturdy the monitor is, and how good the materials used to build it are.
When it matters: All usages.
Score components: Subjectively assigned
LG 27UD68P-B Build Quality picture

The build quality of the LG 27UD68P is fine. The monitor is almost entirely made of plastic, but this isn't an issue for normal use.

The picture quality of this 4k LG 27UD68-P is slightly below average due to the sub-par native contrast ratio and poor black uniformity. This means that when viewed in a dark room, the image will appear washed out and blotchy. Thankfully, the image is very accurate out of the box and the sides remain accurate when viewed from up close due to the wide viewing angles. The monitor can get quite bright to combat glare, and the reflection handling is good too, which is good for a bright room or office. Unfortunately, some temporary image retention is present but this isn't likely to be a big issue, and it doesn't support local dimming or HDR to improve the picture quality further.

6.3 Contrast
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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:
LG 27UD68P-B Checkerboard Picture
Native Contrast
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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
:
1165 : 1
Contrast with local dimming
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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

The contrast ratio of the LG 27UD68P-B is passable. This is mostly due to the IPS panel used on this monitor, as those tend to have lower native contrast ratio when compare to VA panel. This result in blacks that look more like gray when viewed in a totally dark room. Fortunatelly, when viewed in a well-lit room, this becomes less apparent, as the ambient light visually counteract the negative effect of a low contrast ratio.

0 Local Dimming
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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
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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
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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 monitors have more uniform blacks than some full-array monitors.
:
Edge

The LG 27UD68P-B does not have a local dimming feature. The video is for reference only.

7.6 SDR Peak Brightness
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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
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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.
:
313 cd/m²
SDR Peak 2% Window
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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 monitor 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
:
327 cd/m2
SDR Peak 10% Window
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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 monitor 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
:
328 cd/m2
SDR Peak 25% Window
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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 monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
329 cd/m2
SDR Peak 50% Window
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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 monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
329 cd/m2
SDR Peak 100% Window
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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 monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
329 cd/m2
SDR Sustained 2% Window
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What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 2% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright highlights, persistent during a scene.
:
243 cd/m2
SDR Sustained 10% Window
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What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 10% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright objects, persistent during a scene.
:
239 cd/m2
SDR Sustained 25% Window
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What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 25% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
251 cd/m²
SDR Sustained 50% Window
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What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 50% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
285 cd/m2
SDR Sustained 100% Window
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What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 100% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
327 cd/m2
SDR ABL
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What it is: The standard deviation 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
:
0.0

The LG 4K is capable of reaching good levels of brightness, making it suitable for most viewing environments. Its screen does dim slightly when showing static images for a significant amount of time.

0 HDR Peak Brightness
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What it is: How bright the screen can get. Measured with local dimming and with HDR content.
When it matters: HDR content
HDR Real Scene : N/A
HDR Peak 2% Window : N/A
HDR Peak 10% Window : N/A
HDR Peak 25% Window : N/A
HDR Peak 50% Window : N/A
HDR Peak 100% Window : N/A
HDR Sustained 2% Window : N/A
HDR Sustained 10% Window : N/A
HDR Sustained 25% Window : N/A
HDR Sustained 50% Window : N/A
HDR Sustained 100% Window : N/A
HDR ABL : N/A

HDR is not supported.

6.8 Horizontal Viewing Angle
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What it is: Color accuracy when viewed from the side.
LG 27UD68P-B Horizontal Color Shift Picture
Color Shift from Left
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What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your left
Good value: > 50°
Noticeable difference: 10°
:
35 °
Color Shift from Right
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What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right
Good value: > 50°
Noticeable difference: 10°
:
39 °
LG 27UD68P-B Horizontal Brightness Picture
Brightness from Left
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What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your left.
Good value: > 50°
Noticeable difference: 10°
:
41 °
Brightness from Right
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What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right.
Good value: > 50°
Noticeable difference: 10°
:
35 °
LG 27UD68P-B Horizontal Black Level Picture
Black Level from Left
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What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right.
Good value: > 50°
Noticeable difference: 10°
:
75 °
Black Level from Right
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What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right.
Good value: > 50°
Noticeable difference: 10°
:
75 °
Curve Radius : N/A

Decent horizontal viewing angle. At an angle, the black level remains fairly consistent, but brightness and colors do become slowly worse with increasing angle.

8.2 Vertical Viewing Angle
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What it is: Color accuracy when viewed from the top or bottom.
LG 27UD68P-B Vertical Color Shift Picture
Color Shift from Below
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What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor from below.
Good value: > 50°
Noticeable difference: 10°
:
30 °
Color Shift from Above
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What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor when standing up.
Good value: > 50°
Noticeable difference: 10°
:
25 °
LG 27UD68P-B Vertical Brightness Picture
Brightness from Below
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What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor from below.
Good value: > 50°
Noticeable difference: 10°
:
38 °
Brightness from Above
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What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor while standing up.
Good value: > 50°
Noticeable difference: 10°
:
34 °
LG 27UD68P-B Vertical Black Level Picture
Black Level from Below
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What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor from below.
Good value: > 50°
Noticeable difference: 10°
:
75 °
Black Level from Above
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What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor while standing up.
Good value: > 50°
Noticeable difference: 10°
:
75 °

Great vertical viewing angle. The black level remains almost perfect, but brightness and colors do degrade significantly at an angle.

8.6 Gray Uniformity
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What it is: Evenness of colors onscreen (not just gray).
When it matters: Solid colors. Sports, panning shots.
Score components:
LG 27UD68P-B 50% Uniformity Picture
50% Std. Dev.
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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%
:
3.111 %
50% DSE
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What it is: 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%
:
0.111 %
LG 27UD68P-B 5% Uniformity Picture
5% Std. Dev.
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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%
:
0.377 %
5% DSE
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What it is: High-frequency variance of uniformity. Dark spots on the screen.
When it matters: Dark scenes.
Good value: < 0.116%
:
0.042 %

This LG 27UD68-P monitor has an impressive gray uniformity. On our 50% gray uniformity test picture, we can see that both sides are a bit darker than the center, but besides that, not much other issues can be noticed. On the 5% gray test picture, even fewer issues can be noticed, which is an excellent result.

4.8 Black Uniformity
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What it is: Evenness of blacks.
When it matters: Dark scenes viewed in a dark room.
Score components:
LG 27UD68P-B Native Black Uniformity Picture
Native Std. Dev.
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What it is: Average of the squared difference of the blacks.
When it matters: Dark scenes viewed in a dark room.
Good value: <2%
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.
:
2.778 %
Std. Dev. w/ L.D.
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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: <2%
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

This LG 27UD68-P monitor has a poor black uniformity due to some major flashlighting around each corner and also near the top and bottom edge, which really hurts the black uniformity. This is an issue for a dark room, where backlight bleed (BLB) is noticeable but in a bright room, this isn't a problem.

8.3 Pre Calibration
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What it is: Monitor's color accuracy before a full calibration. The measurements are taken with out of the box 'factory setting'.
When it matters: All video on an uncalibrated TV. This represents most people's use cases.
Score components:
LG 27UD68P-B Pre Calibration Picture LG 27UD68P-B Pre Gamma Curve Picture LG 27UD68P-B Pre Color Picture
Picture Mode
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What it is: The picture mode that was used to do the pre-calibration reading. We usually go for the picture mode that gives us the more control over all the picture quality setting.
:
Custom
Luminance
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What it is: The luminance at which the pre-calibration reading was done. This represents the luminance of the monitor when it is at the factory default settings.
:
317.5 cd/m2
Luminance Settings
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What it is: The luminance settings, often named 'Brightness' on monitors, usually range from 0 to 100.
:
100
Contrast Setting
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What it is: The monitor contrast setting, usually ranging from 0 to 100.
:
70
RGB controls
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What it is: This is the value for each color (red, green, and blue) used in the monitor internal RGB cuts/gains controls. If the monitor does not have an internal RGB cuts/gains controls, then the color temperature setting will be used instead, and the color temperature that gives us the best result will be used.
:
50-50-50
Color Temperature
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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 for PC monitors and also for the sRGB color standard.
When it matters: When you care about color reproduction and accuracy.
Good value: 6500K
Noticeable difference: 400K
:
6563 K
White Balance dE
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What it is: Average inaccuracy of shades of gray.
When it matters: Overall color temperature of all video.
Good value: < 3
Noticeable difference: 1
:
1.68
Color dE
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What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
2.65
Gamma
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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
:
2.09

Out of the box, this LG monitor has a great accuracy. The white balance dE is under 2, which is very good for an uncalibrated monitor. The color accuracy is also great with a dE of 2.65, which is once again very good for an uncalibrated monitor. The gamma is a bit low though and the gamma curve does not track closely our target.

If you are not planning to calibrate this monitor, there is 3 mode with almost the same accuracy level. 'Custom', 'Cinema', and 'sRGB' all have about the same white balance dE and color dE, so you could choose any of those picture modes without issues.

9.4 Post Calibration
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What it is: Monitor's color accuracy after a full calibration with a spectrophotometer.
When it matters: All graphics and video content on a monitor that has been professionally calibrated.
Score components:
LG 27UD68P-B Post Calibration Picture LG 27UD68P-B Post Gamma Curve Picture LG 27UD68P-B Post Color Picture
Picture Mode
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What it is: The picture mode that was used to do the calibration reading. We usually go for the picture mode that gives us the more control over all the picture quality setting.
:
Custom
Luminance
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What it is: The luminance at which the calibration was executed. We aim for a luminance level of 100 cd/m².
:
100.2 cd/m2
Luminance Settings
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What it is: The luminance settings, often named 'Brightness' on monitors, usually range from 0 to 100.
:
10
Contrast Setting
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What it is: The monitor contrast setting, usually ranging from 0 to 100.
:
70
RGB controls
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What it is: This is the value for each color (red, green, and blue) used in the monitor internal RGB cuts/gains controls. If the monitor does not have an internal RGB cuts/gains controls, then the color temperature setting will be used instead, and the color temperature that gives us the best result will be used.
:
53-50-50
Color Temperature
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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 for PC monitors and also for the sRGB color standard.
When it matters: When you care about color reproduction and accuracy.
Good value: 6500K
Noticeable difference: 400K
:
6374 K
White Balance dE
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What it is: Average inaccuracy of shades of gray.
When it matters: Overall color temperature of all videos.
Good value: < 3
Noticeable difference: 1
:
0.88
Color dE
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What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
0.71
Gamma
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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
:
2.27

After calibration, the LG 27UD68P-B accuracy is excellent. Both the white balance and color dE are under 1, which at this level, the inaccuracy are almost not noticeable at all. The biggest correction was applied on the gamma, which now tracks our 2.4 target and the curve is almost spots on.

You can download our ICC profile calibration here.

8.7 SDR Color Gamut
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What it is: The palette of colors the monitor can display
When it matters: General content consumption or production
Score components:
LG 27UD68P-B Color Gamut s.RGB Picture
s.RGB xy
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What it is: Coverage of the s.RGB colorspace on CIE 1931 xy.
When it matters: Almost all content. Includes websites, standard windows environment and SDR movies
Good value: > 95%
Noticeable difference: 5%
:
97.8 %
LG 27UD68P-B Color Gamut ARGB Picture
Adobe RGB xy
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What it is: Coverage of the Adobe RGB colorspace on CIE 1931 xy.
When it matters: Professional photography.
Good value: > 90%
Noticeable difference: 5%
:
76.5 %

Near perfect coverage of the standard s.RGB colorspace, which is great for most uses. Coverage of the Adobe RGB colorsplace, however, is quite limited, making this monitor less useful for professional use such as print editing.

8.9 SDR Color Volume
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What it is: How much of the SDR color spaces the monitor can reproduce
When it matters: General usage and SDR media creation
Score components:
LG 27UD68P-B s.RGB Color Volume ITP picture
s.RGB in ICtCp
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What it is: How much of the s.RGB colorspace a monitor can display at different luminosity levels
When it matters: Most content, including web, SDR video games, and SDR media creation
:
95.8 %
LG 27UD68P-B Adobe RGB Color Volume ITP Picture
Adobe RGB in ICtCp
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What it is: How much of the Adobe RGB colorspace a monitor can display at different luminosity levels, normalized to the monitor's peak brightness.
When it matters: Professional media creation
:
81.8 %

Great SDR color volume. The LG 27UD68-P covers the s.RGB and Adobe RGB volumes well. It does struggle to reproduce very dark tones due to its lower contrast ratio.

0 HDR Color Gamut
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What it is: The monitor's ability to reproduce HDR color spaces
When it matters: HDR content consumption or media creation
Score components:
Wide Color Gamut
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What it is: Whether the monitor can support wider color gamuts
When it matters: HDR content and media creation
:
No
DCI P3 xy
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What it is: Coverage of the DCI P3 colorspace on CIE 1931 xy
When it matters: When consuming or producing HDR content.
:
N/A
Rec. 2020 xy
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What it is: Coverage of the Rec.2020 colorspace on CIE 1931 xy.
When it matters: When consuming or producing HDR content.
Good value: > 90%
Noticeable difference: 5%
:
N/A

HDR gamuts are not supported.

0 HDR Color Volume
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What it is: How much of the HDR color spaces a monitor can display at different luminosity levels.
When it matters: HDR content consumption and production. Includes streaming services, UHD Blu-rays and HDR games.
Score components:
DCI-P3 in ICtCp
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What it is: How much of the DCI-P3 colorspace a monitor can display at different luminosity levels, normalized to the monitor's peak brightness output.
When it matters: HDR content.
Good value: 80%
Noticeable difference: 5%
:
N/A
Rec. 2020 in ICtCp
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What it is: How much of the Rec. 2020 colorspace a monitor can display at different luminosity levels, normalized to the monitor's peak brightness output.
When it matters: HDR content.
Good value: 80 %
Noticeable difference: 5 %
:
N/A

HDR color volumes are not supported.

2.0 Image Retention
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What it is: How much a static image is retained on a monitor screen after a certain amount of time.
When it matters: When working or playing video games on your PC monitor.
LG 27UD68P-B Image Retention Picture
IR after 0 min recovery
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What it is: Image retention measured right after the static image exposure, without recovery time.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
1.11 %
IR after 2 min recovery
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What it is: Image retention measured after a recovery time of 2 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect
Noticeable difference: 0.015%
:
0.41 %
IR after 4 min recovery
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What it is: Image retention measured after a recovery time of 4 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.12 %
IR after 6 min recovery
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What it is: Image retention measured after a recovery time of 6 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.09 %
IR after 8 min recovery
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What it is: Image retention measured after a recovery time of 8 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.06 %
IR after 10 min recovery
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What it is: Image retention measured after a recovery time of 10 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0 %

The LG 27UD68-P monitor does have some image retention, which is easily noticeable right after the 10 minutes burn-in scene. The retention stays visible for almost 10 minutes before it completely dissipates. This is unlikely to be very noticeable in normal usage though, except for changing from a static screen to a fairly uniform desktop background for example.

9.9 Gradient
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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.
Score components: Subjectively assigned
LG 27UD68P-B Gradient Picture
Color Depth
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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 HDR video games or HDR UHD movies. Won't matter for regular Blu-ray movies, SDR video game or desktop environment content displayed from a Windows PC. Those are limited to 8-bit color.
Good value: 10-bit.
Noticeable difference: 1 bit.
:
10 Bit

An outstanding performance of the LG 27UD68P monitor on our gradient test. the 10-bit panel does an amazing job and no banding at all can be noticed here. Only some really minor issues can be noticed in the grayscale, but this is not in any case problematic.

10 Color Bleed
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What it is: How much the color from one area of the screen affects the color in another area of the screen.
When it matters: All usages, but especially media creation.
Score components:
LG 27UD68P-B Color bleed horizontal
Pixel row error
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What it is: The amount of bleed that appears across the screen horizontally.
When it matters: General usage of a PC monitor, can appear when browsing the web or with media creation like graphics.
Good value: <0.2%
Noticeable difference: 0.1%
:
0.000 %
LG 27UD68P-B Color bleed vertical
Pixel column error
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What it is: Amount of color bleeding that appears across the screen vertically.
When it matters: Most uses of a PC monitor. Can appear while browsing the web or when editing images or graphics.
Good value: <0.2%
Noticeable difference: 0.1%
:
0.000 %

The LG 27UD68P-B does not produce any bleeding when displaying large single color surfaces.

7.0 Reflections
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What it is: How much light is reflected by the TV.
When it matters: Bright rooms.
Score components: Subjectively assigned
LG 27UD68P-B Average room LG 27UD68P-B Average room off picture LG 27UD68P-B Bright room off picture

The reflection handling of the LG 27UD68P is decent. It has a light matte finish which diffuses reflections across the screen and reduces their intensity, but not as much as some higher end anti-reflective coatings. It is fine for an average room but may be an issue in a bright room.

7.9

Motion

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Score components:

The LG 27UD68-P has great handling of motion. It has a very good response time, which results in short trails following moving objects. It uses DC dimming, so the screen is flicker-free, but unfortunately, BFI can't be enabled to help clear up motion. The monitor has a native refresh rate of 60Hz and can use FreeSync to display variable frame rates lower than its native refresh rate when used with a compatible video card.

8.4 Motion Blur
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What it is: The performance of the pixel response time. Poor response time causes trails to follow moving objects. Response time is one of a few sources of motion blur.
When it matters: When there's fast movement on screen, such as during video games and sports.
Score components:
LG 27UD68P-B Motion Blur Picture LG 27UD68P-B Response Time Chart
80% Response Time
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What it is: How quickly pixels can reach 80% of a full transition from one color to another.
When it matters: When there's fast movement on screen, such as during video games and sports.
Good value: < 8 ms
Noticeable difference: 4 ms
:
5.0 ms
100% Response Time
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What it is: How quickly pixels can fully transition from one color to another.
When it matters: When there's fast movement on screen, such as during video games and sports.
Good value: < 20 ms
Noticeable difference: 10 ms
:
16.6 ms
Best Overdrive Setting
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What it is: If the monitor has adjustable pixel overdrive settings, which one produces the best response time with minimal overshoot.
When it matters: When adjusting the monitor's settings to get the least possible motion blur.
:
Middle

Response time Off
Response time Low
Response time Middle
Response time High

The LG 27UD68P-B has a fast response time, which is great for watching fast-paced content or playing games such as first person shooters. Pixel transition speed can be modified by changing the 'Response' setting. We recommend using the 'Middle' setting for fast response without overshoot, but the 'High' setting is slightly faster, so you can use it if you don't mind small pixel overshoot artifacts appearing as lighter trails following moving objects. Note that setting 'Response time' to 'High' counter intuitively lowers response time, while 'Low' or 'Off' increases response time.

7.5 Image Flicker
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What it is: Luminosity pattern when displaying images
When it matters: Nearly all the time during PC monitor use, but especially during fast movement such as video games
LG 27UD68P-B Backlight Picture
Flicker-free : Yes
PWM Dimming Frequency
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What it is: Flickering pattern at different luminosities.
When it matters: For people sensitive to flickering.
Good value: N/A or high frequencies (> 300 Hz). Frequencies that are multiples of 60Hz are better.
:
0 Hz
Black Frame Insertion (BFI)
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What it is: Option to turn screen black between frames
When it matters: Reduces eye tracking blur in motion
Good value: Yes
:
No
BFI Maximum Frequency
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What it is: Highest possible frequency of flickering pattern
When it matters: Reduces eye-tracking blur in motion
Good value: Matches the native refresh rate
Noticeable difference: 20 Hz
:
N/A
BFI Minimum Frequency
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What it is: Lowest possible frequency of flickering pattern
When it matters: Reduces eye-tracking blur in motion
Good value: 60 Hz
Noticeable difference: 20 Hz
:
N/A

Like most monitors, the LG 27UD68P doesn't flicker, and instead, shows each image for a full frame. This makes motion appear slightly smoother but results in some persistence blur as the image is static for the entire frame duration. It is not possible to use Black Frame Insertion (BFI) to add flicker and help reduce persistence blur. It is unfortunate as it can help to produce a clearer image when gaming.

7.8 Refresh Rate
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What it is: How frequently the monitor can refresh and show new frames, and whether it can vary its refresh rate in real time using technologies like G-sync and FreeSync.
When it matters: Mostly for gaming, but does provide a little better motion during normal usage.
Native
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What it is: The frequency at which the monitor is capable of displaying images every second
When it matters: General usage, but better results are most important for gaming
Good value: >100 Hz
Noticeable difference: 15 Hz
:
60 Hz
Factory Overclock
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What it is: The frequency at which the monitor's can be boosted to using its internal menu.
When it matters: Gaming and other usages where high frame rate content is consumed.
Good value: >100
Noticeable difference: 15
:
N/A
Variable Refresh Rate
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What it is: Feature that allows the monitor 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 in gaming where constant fluctuation in framerate cause distracting artifacts.
:
FreeSync
VRR Maximum
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What it is: The maximum frequency covered by the Variable Refresh Rate feature of the monitor.
When it matters: Any time the VRR feature is enabled.
Good value: Matches Refresh rate
Noticeable difference: 10 Hz
:
60 Hz
VRR Minimum
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What it is: The lowest frequency covered by the monitor's Variable Refresh Rate feature.
When it matters: When using the VRR feature of the monitor at lower frame rates.
Good value: 30 Hz
:
40 Hz
VRR Maximum With OC
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What it is: The maximum frequency covered by the Variable Refresh Rate feature when the monitor's overclocking feature is used.
When it matters: When both the overclocking and VRR features are used.
Good value: Matching the overclocked refresh rate.
Noticeable difference: 10 hz
:
N/A
VRR Supported Connectors : DisplayPort

The monitor has a high native refresh rate of 60Hz. Freesync on this monitor can adjust the screen's refresh rate to match the frame rate of a compatible graphics card, which allows playing graphically-intensive games with some framerate drops without tearing or stuttering. Unfortunately, this monitor has a small VRR range and starts displaying tearing or stuttering at refresh rates below 40Hz.

9.0

Inputs

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Score components:

The LG 27UD68-P has great low input lag, a very high 4K UHD resolution and a large 27" screen size, which will please almost any user.

8.9 Input Lag
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What it is: Delay between input and onscreen reaction.
When it matters: General usage of the mouse and gaming.
Native Resolution
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What it is: Lowest input lag possible at the center of the screen, when the monitor is displaying its native resolution at its native refresh rate.
When it matters: General usage and while playing video games.
Good value: < 15 ms
Noticeable difference: 5 ms
:
9.3 ms
Non-Native Resolution
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What it is:

Lowest input lag possible at the center of the screen, when the monitor is displaying an alternative resolution at its native refresh rate. The non-native resolution tested depends on the native resolution of the monitor, following this pattern unless otherwise specified in the Input Lag text:

Native Resolution Non-Native Resolution Tested
4k UHD QHD
QHD FHD
FHD 1600x900
3440x1440 2560x1080
2560x1080 1920x1080
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
9.3 ms
Native Resolution @ 60 Hz
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What it is: Lowest input lag possible at the center of the screen, when the monitor is displaying its native resolution at a refresh rate of 60 Hz.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
9.3 ms
Variable Refresh Rate
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What it is: Lowest input lag possible at the center of the screen, when the monitor is using its Variable Refresh Rate feature at its native resolution.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
8.7 ms
HDR
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What it is: Lowest input lag possible at the center of the screen, when the monitor is displaying an HDR signal at its native resolution and refresh rate.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
N/A
Black Frame Insertion (BFI)
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What it is: Lowest input lag possible at the center of the screen, when BFI is enabled and the monitor is displaying a signal at the highest supported BFI refresh rate.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
N/A

Great low input lag, especially for a 60 Hz monitor. The FreeSync input lag is roughly equal to the input lag at native refresh rate, which is great.

9.1 Resolution and Size
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What it is: The number of pixels the monitor can display, and the surface area of its screen.
When it matters: All usages, but especially for office and media editing.
Score components:
Native Resolution : 4K UHD, 3840 x 2160
Aspect Ratio : 16:9
Megapixels : 8.3 MP
Pixel Density : 164 PPI
Screen Diagonal : 26.9 inches
Screen Area : 310 sq inches

The LG 27UD68P has a very high 4K UHD resolution and a large 27" size, which gives it plenty of screen space while still having incredible pixel density and detail.

Inputs
LG 27UD68P-B Inputs 1

All of the inputs are located on the back of the monitor.

Total Inputs
DisplayPort : 1 (DP 1.2)
Mini DisplayPort : No
HDMI : 2 (HDMI 2.0)
DVI : No
VGA : No
DisplayPort Out : No
USB : No
USB C : No
Analog Audio Out 3.5mm : 1
Microphone In 3.5mm : No
Digital Optical Audio Out : No
Analog Audio Out RCA : No

Features

The LG 27UD68-P supports some additional features through the monitor menu, such as picture beside picture and response time adjustments. There is a single control stick located below the front of the monitor for navigation, however, it is not as intuitive to use as some other models with discrete buttons.

Additional Features
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What it is: Additional features found on the monitor
Score components:
Speakers
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What it is: Whether or not the monitor features standalone speakers.
When it matters: When using your computer without headphones or a dedicated pair of speakers.
:
No
HDR10 : No

The 27US68P does not include speakers, but it does allow to pass sound through its input connection to a 3.5mm jack.

Some additional features are available through the on screen menu:

  • Picture beside picture
  • Response time adjustments
  • 'Super Resolution' to improve the quality of low quality content
  • FreeSync

On-Screen Display (OSD)
Controls
LG 27UD68P-B Controls picture

A single control stick is located under the LG logo at the front of the monitor. It is quite easy to use, but not as intuitive as discrete buttons found on other monitors.

In The Box
LG 27UD68P-B In The Box picture

  • Manual
  • Calibration document
  • Power brick
  • HDMI cable

Differences between Sizes and Variants

We tested the 27" model with black trim (27UD68P-B). However, the monitor is also available in a white variant (27UD68P-W). It is also closely related to the cheaper 27UD58P, which is available in 24" (24UD58P-B) and 27" (27UD58P-B) variants.

If someone comes across a different type of panel or if their 27UD68 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.

Model Other name Size Refresh rate Notes
24UD58P-B   24" 60Hz  
27UD58P-B   27" 60Hz  
27UD68P-B 27UD68-P 27" 60Hz Black variant
27UD68P-W 27UD68-W 27" 60Hz White variant

Compared to other Monitors

LG 27UD68P-B Group Shot Picture
Left: LG 27UD58P-B. Middle: LG 27UD68-P. Right: ASUS PB277Q.
Unlike our other photographs, this picture wasn't taken under a controlled environment, so do not draw conclusions from it.

The LG 27UD68B-P is a decent 4k monitor with an IPS screen and FreeSync support. There is a lot of competition though, so depending on your use it may or may not be the best choice.

LG 27UD58-B

The LG 27UD58P-B is the model below in the LG lineup. It also boasts a 4k screen and has similar picture quality but the stand has a very limited range of movement and adjustability and the monitor can't get bright to overcome glare. If you only care about picture quality and the 4k resolution, then go with the cheaper 27UD58. However, if you plan to adjust the monitor position occasionally (such as for sharing with coworkers) or have more glare, then it may be worth spending more on the higher-end LG 27UD68P-B.

ASUS PB277Q

The ASUS PB277Q is a gaming monitor with a 75Hz refresh rate and TN panel. It has worse image quality, which is mostly due to the poor viewing angles. This results in the sides of the screen looking different (and inaccurate) when viewed from up close. It has a lower 1440p resolution, which makes it slightly worse for multi-taskers as well (less space for side-by-side windows). For gamers though, it does have an excellent response time so motion is clear and input lag is very low. Overall, the LG 27UD68B-P is a better choice but if you only plan to game and don't care about picture quality, then it may be worth going with the cheaper ASUS PB277Q.

Samsung CHG70

The Samsung CHG70 is a slightly higher-end gaming monitor with a 144Hz refresh rate and HDR support. It has better picture quality due to the high native contrast ratio of the VA panel, and can also produce saturated colors and fairly bright highlights for HDR. The image does degrade when viewed at an angle, but this is mitigated somewhat by the curved screen, which results in a smaller angle to the screen at the sides. If you care more about the 4k resolution, then go with the LG 27UD68B-P but if you can afford it, the Samsung CHG70 offers better overall performance and HDR support.

AOC AGON AG271QX

The AOC Agon AG271QX is a gaming-oriented monitor with a 144Hz refresh rate and a TN panel with very little motion blur. It also supports FreeSync, with a large refresh rate range so games appear smooth. Unfortunately the picture quality is worse than the LG, and even when viewed from directly in front the edges of the screen appear non-uniform due to the poor viewing angle. If you plan to use the monitor for high FPS gaming then the Agon AG271QX is a better choice but if you care about picture quality or plan to use it outside of gaming then go with the LG 27UD68P-B.

Conclusion
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7.6Mixed Usage
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Score components:
  • 30% Office
  • 30% Multimedia
  • 25% Gaming
  • 10% Media Creation
  • 5% HDR Gaming
Good monitor for a mixed usage. The 27UD68P-B performs well overall, and its IPS display makes it versatile enough to suit most people's needs. Its wide viewing angle and high resolution are noteworthy features, but the 27UD68P also struggles slightly in darker environments due to its low contrast and non-uniform blacks.
Very good monitor to use in an office. The LG 27UD68P-B's highly adjustable stand makes it convenient to set up ergonomically, and its wide viewing angle and good brightness make it easy to share with co-workers. Its high resolution and decently large 27" size make it a powerful productivity tool, as it becomes easy to open and manage multiple windows at once.
The LG 27UD68-P is a great gaming monitor. It supports Freesync for a tear-free experience, and its low input lag and motion blur keep games responsive and immersive. Unfortunately, its 60 Hz refresh rate makes it less fitting for more competitive gamers. The picture quality is also only passable, especially if gaming in a dark room where blacks appear gray and blotchy.
Decent monitor for consuming a variety of media. The LG 27UD68P-B is quite accurate out of the box, and it covers the standard s.RGB gamut almost perfectly. It also remains accurate when viewed at an angle, which is great. Unfortunately, its low contrast means its picture quality will be less than stellar in a dark room, and it does not support any HDR related feature such as wide color gamuts.
Good monitor for casual media creation. The LG 27UD68P-B's factory calibration is better than average, and it is very easy to calibrate to almost perfect accuracy. It's also capable of 10 bits of color depth for more even gradients. Unfortunately, it lacks coverage of wider gamuts such as DCI-P3 and Adobe RGB necessary for more professional users.
HDR is not supported. There are only a few HDR monitors such as the Samsung CHG70.
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Questions & Answers

4 ANSWERED QUESTIONS
2
Hi! In the review, this monitor is stated to include speakers. However, my research shows that it actually does not have audio speakers. Instead, it has a headphone out port that allows the audio to pass through when plugged in. Please double check and confirm for us.
Thank you for the heads up! This monitor does lack speakers and its appearance as a sound output device in windows is misleading. The review has been updated.
0
Does this monitor support FreeSync over HDMI?
Hi and thanks for contacting us. The LG 27UD68P-B support freeSync only via Displayport unfortunately. In the review, you can find this information in the 'Refresh Rate' box, under 'VRR Supported Connectors'.
0
What is the quality of scaling for non native resolutions? I plan to game at 1080p or 1440p on this monitor and probably use it with my Nintendo Switch as well.
We tested it with a Nintendo Switch and found the upscaling was not great when compared to a 4k TV. This is normal since most monitors lack the advanced processing capabilities needed to cleanly upscale lower resolution content.
0
Hi! Thanks for sharing your ICC profile for the calibration - things look like they have bumped up to a more natural tone. Are there recommended settings for the monitors OSD? I see the notes about RGB and brightness (was the brightness at 10 just for calibration? I find that level unusable for most conditions)

Glad it helped! You should adjust these based on your viewing situation. Brightness especially highly depends on the level of ambient light as well as personal preference. The level of 10 was only used for calibration.

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