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

LG 27UD58-B
MONITOR REVIEW

Usage Ratings - Version 1.0

Test Benches: test

  • 1.0: Fall 2017
7.2
Mixed Usage
Score components:
  • 30% Office
  • 30% Multimedia
  • 25% Gaming
  • 10% Media Creation
  • 5% HDR Gaming
Size : 27 "
Resolution : 3840x2160
Refresh Rate : 60 Hz
LCD Type
What it is: Type of LCD technology used by the monitor.
When it matters: Different technologies have different viewing angle properties.
:
IPS

The LG 27UD58-B is a good 4k IPS gaming monitor with a passable picture quality. It has a few gaming oriented features such as FreeSync and very low input lag for a 60Hz monitor. Motion handling is also good but limited by the relatively low refresh rate. Unfortunately, backlight bleed is bad when viewed in a dark room and the reflection handling isn't as good as some other monitors when viewed in a bright room.

Test Results
Design 7.5
Picture Quality 6.7
Motion 7.8
Inputs 9.0
Pros
  • Input lag is very low
  • Solid colors and backgrounds are uniform
  • High resolution is great for multitasking
Cons
  • Blacks appear gray and blotchy
  • Prominent backlight bleed

Check Price

7.5

Design

Score components: Subjectively assigned
LG 27UD58-B Design Picture
Curved : No
Curve radius : N/A
Weight (without stand) : 10.0lbs (4.5 kg)
Weight (with stand) : 12.2lbs (5.5 kg)

The design of the LG 27UD58-B monitor is good. The monitor looks good from the front, due to the fairly unique crescent stand. The black borders also look good, even if they are a bit thicker than most other monitors. Unfortunately, the ergonomic adjustment options are limited with only the ability to tilt the monitor which can make it difficult to find a comfortable viewing position. The build quality is decent, and the stand feels stable.

Stand
LG 27UD58-B Stand picture
Width : 15.7" (40.0 cm)
Depth : 8.0" (20.3 cm)

The stand of the LG 27UD58-B is similar to other LG monitors (and TVs) such as the 27UD68P-B. It has a fairly small footprint and feels stable.

1.5 Ergonomics
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 27UD58-B Ergonomics picture
Height Adjustment : N/A
Switch portrait/landscape : No
Swivel Range : N/A
Tilt Range : -20° to 5°

The ergonomic adjustments of the LG 27UD58-B are very limited, which can make it difficult to find a comfortable viewing position or to share images with coworkers.

Back
LG 27UD58-B Back picture
Wall Mount : Vesa 100x100

The rear of the monitor is basic but looks good. All of the inputs are located on the same panel and do stick directly out the back, which may make them more difficult to connect in some setups. It looks quite similar to the 27UD68P-B, but with a matte plastic finish instead of glossy.

Borders
LG 27UD58-B Borders picture
Borders : 0.9" (2.3 cm)

The borders of the LG 27UD58 are quite thin and look good. There is only a small gap between the edge of the border and the first pixels.

Thickness
LG 27UD58-B Thickness picture
Thickness (with stand) : 5.9" (15.1 cm)
Thickness (without stand) : 1.8" (4.5 cm)

The LG 27UD58-B monitor appears quite thin when viewed from the side. It has two tiers of thickness, but even the thicker part where the VESA mount attaches is quite thin, and the monitor sits close to a wall with the stand attached.

6.5 Build Quality
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 27UD58-B Build Quality picture

The build quality of this LG 27UD58 monitor is decent. It is entirely made of plastic, including the stand which isn't an issue but the joints do feel a bit flimsy. This isn't an issue with normal use though.

The LG 27UD58-B has a passable picture quality. The contrast ratio is mediocre and the black uniformity is poor and as such, picture quality in a dark room could be better. Fortunately, when the monitor is set in a brighter environment, the monitor fares much better, as the peak brightness and the way it can deal with reflections are decent. The viewing angles (horizontal and vertical) are okay and give a good picture to the user even if he looks at the monitor from an off-center position.

The gray uniformity is excellent and dirty screen effect is not noticeable at all, which is good especially for multimedia content, where, when present, can be really distracting. This monitor does not support HDR and more advanced features that often come with it, like local dimming, but the monitor still offers a good performance for anyone looking for a good and accurate monitor.

6.0 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:
LG 27UD58-B Checkerboard Picture
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
:
989 : 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

The monitor has a passable contrast ratio. With a contrast ratio just shy of 1000:1, the monitor won't be the best monitor to use in a dark room since it can't really reproduce deep blacks which is important for dark video content. When set in a bright room though, the LG 27UD58-B does a much better job and is on par with other IPS monitors.

0 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 monitors have more uniform blacks than some full-array monitors.
:
Direct

This monitor does not feature a local dimming option. The video is for reference only.

6.5 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
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.
:
220 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 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
:
239 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 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
:
241 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 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.
:
240 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 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.
:
240 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 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.
:
239 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 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.
:
241 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 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.
:
241 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 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.
:
240 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 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.
:
240 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 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.
:
240 cd/m²
SDR ABL
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 SDR peak brightness is decent. It can't get as bright as the LG 27UD68P-B, but doesn't dim at all when showing static images which is good.

0 HDR Peak Brightness
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
What it is: Color accuracy when viewed from the side.
LG 27UD58-B Horizontal Color Shift Picture
Color Shift from Left
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°
:
34 °
Color Shift from Right
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°
:
30 °
LG 27UD58-B Horizontal Brightness Picture
Brightness from Left
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°
:
42 °
Brightness from Right
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°
:
38 °
LG 27UD58-B Horizontal Black Level Picture
Black Level from Left
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
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

The horizontal viewing angle is decent. When viewed at an angle, the colors do shift, but much less so than monitors with TN or VA panels such as the Samsung CHG70 and Dell S2716DG. The brightness also drops off as seen in the video.

7.9 Vertical Viewing Angle
What it is: Color accuracy when viewed from the top or bottom.
LG 27UD58-B Vertical Color Shift Picture
Color Shift from Below
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°
:
25 °
Color Shift from Above
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°
:
24 °
LG 27UD58-B Vertical Brightness Picture
Brightness from Below
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°
:
32 °
Brightness from Above
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°
:
33 °
LG 27UD58-B Vertical Black Level Picture
Black Level from Below
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
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 °

When viewed from the top or bottom, the image remains accurate which is great. This is almost the same as the LG 27UD68P-B.

8.6 Gray Uniformity
What it is: Evenness of colors onscreen (not just gray).
When it matters: Solid colors. Sports, panning shots.
Score components:
LG 27UD58-B 50% Uniformity Picture
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%
:
3.494 %
50% DSE
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%
:
0.11 %
LG 27UD58-B 5% Uniformity Picture
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%
:
0.443 %
5% DSE
What it is: High-frequency variance of uniformity. Dark spots on the screen.
When it matters: Dark scenes.
Good value: < 0.116%
:
0.053 %

Great gray uniformity for the LG 27UD58-B. Looking at the 50% gray test picture, we can see that the regions near the top and bottom of the screen are a bit darker than the center regions, but besides that nothing really striking can be noticed.

When it comes to the 5% gray uniformity, this LG monitor does a good job, as nothing really bad can be noticed. Overall, this is a good result for this monitor.

4.6 Black Uniformity
What it is: Evenness of blacks.
When it matters: Dark scenes viewed in a dark room.
Score components:
LG 27UD58-B Native Black Uniformity Picture
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: <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.
:
2.916 %
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: <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

The black uniformity of this LG 27UD58-B monitor is poor. Backlight bleed is prominent near each corner of the screen, with the lower right one being the better of them. This poor black uniformity means that dark video content, like dark video cut-scene from video games or any other dark multimedia content, will suffer from this uniformity issues, especially when the monitor is used in a dark room. This is less of an issue if the monitor is used to do office work, as the dark content is more rare.

8.3 Pre Calibration
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 27UD58-B Pre Calibration Picture LG 27UD58-B Pre Gamma Curve Picture LG 27UD58-B Pre Color Picture
Picture Mode
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
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.
:
253.9 cd/m2
Luminance Settings
What it is: The luminance settings, often named 'Brightness' on monitors, usually range from 0 to 100.
:
100
Contrast Setting
What it is: The monitor contrast setting, usually ranging from 0 to 100.
:
70
RGB controls
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
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
:
6521 K
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
:
2.28
Color dE
What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
2.12
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
:
2.15

Out of the box, this monitor has great accuracy. The best measurement was done under the 'Custom' picture mode, but all the other picture modes gave reasonably good readings, except the 'Reader' picture mode, which had a white balance and color dE around 10.

The low white balance dE and color dE (both under 3.0), paired with good color temperature, means this monitor really gives good accuracy, which should be plenty good for most people. The gamma is a bit below our 2.2 target, and the curve does not track that closely our target curve, but for out of the box settings this is still pretty good.

Overall, the LG 27UD58-B could be used by most people, except maybe professionals, without any calibration.

Update: The luminance value has been updated, as there was an error when the data was entered into our system. The good luminance data is 253.9 cd/m² instead of 523.9 cd/m².

9.5 Post Calibration
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 27UD58-B Post Calibration Picture LG 27UD58-B Post Gamma Curve Picture LG 27UD58-B Post Color Picture
Picture Mode
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
What it is: The luminance at which the calibration was executed. We aim for a luminance level of 100 cd/m².
:
100.4 cd/m2
Luminance Settings
What it is: The luminance settings, often named 'Brightness' on monitors, usually range from 0 to 100.
:
20
Contrast Setting
What it is: The monitor contrast setting, usually ranging from 0 to 100.
:
70
RGB controls
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.
:
45-44-50
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 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
:
6368 K
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
:
0.89
Color dE
What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
0.64
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

After calibration, the accuracy of the LG 27UD58-B is excellent. The change in accuracy from the 'Out of the box' settings is not enormous since the monitor had already a good accuracy, but there was still some place for improvement. Now, both white balance dE and color dE are under 1.0, at which point, almost nobody can discern inaccuracies. Looking at the CIE color space image, we can see that the colors that were a bit oversaturated (mostly in the reds and greens) are now tracking much more closely to their targets. As for the gamma, that was a bit low and not tracking the target curve very closely, is now almost spot on on both aspects.

Overall, this monitor is very accurate and should give anyone who uses it a very good experience.

You can download our ICC profile calibration here.

8.7 SDR Color Gamut
What it is: The palette of colors the monitor can display
When it matters: General content consumption or production
Score components:
LG 27UD58-B Color Gamut s.RGB Picture
s.RGB xy
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%
:
98.4 %
LG 27UD58-B Color Gamut ARGB Picture
Adobe RGB xy
What it is: Coverage of the Adobe RGB colorspace on CIE 1931 xy.
When it matters: Professional photography.
Good value: > 90%
Noticeable difference: 5%
:
75.4 %

The color performance of the LG 27UD58-B is great at covering the most common sRGB colorspace. Coverage of the Adobe RGB colorspace is more limited though, which is a downside for professional color use.

8.8 SDR Color Volume
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 27UD58-B s.RGB Color Volume ITP picture
s.RGB in ICtCp
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
:
95.9 %
LG 27UD58-B Adobe RGB Color Volume ITP Picture
Adobe RGB in ICtCp
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
:
79.3 %

The color volume of this monitor is great. The low contrast ratio results in a less complete coverage in the darker areas of the volume, but the great gamut results in a fairly full coverage otherwise.

0 HDR Color Gamut
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
What it is: Whether the monitor can support wider color gamuts
When it matters: HDR content and media creation
:
No
DCI P3 xy
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
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 is not supported.

0 HDR Color Volume
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
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
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 is not supported.

10 Image Retention
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 27UD58-B Image Retention Picture
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 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 %
IR after 2 min recovery
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 %
IR after 4 min recovery
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 %
IR after 6 min recovery
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 %
IR after 8 min recovery
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 %
IR after 10 min recovery
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 %

Perfect score on the image retention test for this LG monitor as no image retention could be noticed at all.

9.8 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.
Score components: Subjectively assigned
LG 27UD58-B Gradient Picture
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 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

The LG 27UD58-B does an amazing job at displaying our gradient test image, as we can see in our test picture. Almost no banding is visible at all, besides some very minimal banding in the dark part of the colors. As this monitor support 10-bit input, no banding generally seen on an 8-bit monitor is visible, overall, this is an excellent result.

10 Color Bleed
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 27UD58-B Color bleed horizontal
Pixel row error
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 27UD58-B Color bleed vertical
Pixel column error
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 %

When displaying large swaths of a single color no issues can be seen with the color bleed performance.

7.0 Reflections
What it is: How much light is reflected by the TV.
When it matters: Bright rooms.
Score components: Subjectively assigned
LG 27UD58-B Average room LG 27UD58-B Average room off picture LG 27UD58-B Bright room off picture

The reflection handling of the LG 27UD58-B is decent. It has a light-matte finish which diffuses reflections across the screen but this also helps to reduce their intensity. For most rooms, this isn't an issue, but in a bright room, the reflections and haze may be distracting.

7.8

Motion

Score components:

Motion looks good on the LG 27UD58-B, but not as good as on many gaming monitors. The 27UD58 has fast pixel response time, a flicker-free backlight and supports FreeSync variable refresh rate technology, but its fairly ordinary 60 Hz refresh rate limits the smoothness of its motion in some use cases like gaming.

8.2 Motion Blur
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 27UD58-B Motion Blur Picture LG 27UD58-B Response Time Chart
80% Response Time
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
:
5.6 ms
100% Response Time
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
:
16.8 ms
Best Overdrive Setting
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

Good pixel response time, good enough for fast motion in video games and TV shows. This results in a clear image with only a short trail visible as shown by the photo above. The 'Response Time Middle' setting was the most balanced and the 'High' setting produced a slightly faster rise time. Unfortunately, it also added a distracting amount of overshoot and therefore, is not recommended.

Overall, the response time is slightly worse than the 27UD58-B's sibling, the 27UD68P-B, but this could just be variance from unit to unit. The competing Samsung UE590 4K monitor has a more significant response time advantage though.

7.5 Image Flicker
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 27UD58-B Backlight Picture
Flicker-free : Yes
PWM Dimming Frequency
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)
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
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
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 27UD58 has a flicker-free backlight, which is great as this results in smoother motion. Unfortunately, the monitor lacks a black frame insertion feature to intentionally add flicker to clear up motion when playing fast-paced video games. However, it's common for a 60 Hz monitor to lack BFI because many people find 60 Hz flicker distracting.

7.8 Refresh Rate
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
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
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
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
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
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
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 fairly ordinary 60 Hz maximum refresh rate; this is good enough for most usages but everyone would benefit from a higher refresh rate, especially gamers. Fortunately for gamers, the monitor supports FreeSync variable refresh rate technology, although only within a fairly narrow range of 40-60 Hz.

The monitor has two different FreeSync modes: 'Basic' (range 48-60 Hz) and 'Extended' (range 40-60 Hz). We recommend using the 'Extended' range, and only using the 'Basic' range as a fallback for games that have problems with the 'Extended' range. Also it was discovered that FreeSync only works properly when the monitor's 'Ratio' setting is set to 'Wide', and has problems when 'Ratio' is set to 'Original'.

9.0

Inputs

Score components:

The LG 27UD58-B's defining feature is its very sharp 4K UHD resolution, which can show every pixel in 4K movies and TV shows, but, unfortunately, can't play them with HDR. The monitor also has great low input lag, which will please all but the most competitive gamers.

8.9 Input Lag
What it is: Delay between input and onscreen reaction.
When it matters: General usage of the mouse and gaming.
Native Resolution
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
:
8.8 ms
Non-Native Resolution
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
:
8.8 ms
Native Resolution @ 60 Hz
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
:
8.8 ms
Variable Refresh Rate
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
:
9.5 ms
HDR
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)
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, good enough for all but the most competitive gamers. The input lag stays fairly consistent in all situations, even when using FreeSync, which is good.

9.1 Resolution and Size
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 monitor's defining feature is its very sharp 4K UHD resolution, which can show every pixel in 4K movies and TV shows in all their glory. All these pixels are shown on a panel with a modest 27" size, giving the monitor a very high pixel density; this is great for most applications, but it can make text too small to read comfortably when DPI scaling isn't used. This size and resolution are the same as the LG 27UD58-B's sibling, the 27UD68P-B; the competing Samsung UE590 4K monitor is slightly larger at 28", but has worse picture quality in general.

Inputs
LG 27UD58-B Inputs 1

All of the inputs are located on the rear 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 27UD58-B has all the standard features expected of a monitor such as image and color settings, as well as some situational features like 'Super Resolution+' enhanced upscaling and 'Black Stabilizer' shadow brightening.

Additional Features
What it is: Additional features found on the monitor
Score components:
Speakers
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 LG 27UD58-B monitor has a few extra features that are useful in certain situations. The 'Super Resolution+' feature uses better upscaling image processing than the default, which can be useful when the monitor is being used at a lower resolution like 1080p. The 'Black Stabilizer' feature warps the monitor's gamma curve to brighten or darken dark details like shadows, which can be useful when playing some competitive games. The monitor also has an 'Automatic Standby' timer to put the monitor on standby after 4, 6 or 8 hours.

On-Screen Display (OSD)
Controls
LG 27UD58-B Controls picture

The LG 27UD58-B monitor's on-screen display is controlled by a small joystick nub on the screen's bottom edge, which also doubles as the power button. This joystick turns out to be a really intuitive way to navigate the OSD, better than the four button scheme used by most monitors. Many other LG monitors use this joystick, like the 29UM69G-B, as well as many Samsung monitors like the CHG70.

In The Box
LG 27UD58-B In The Box picture

  • Manual and drivers
  • Calibration report
  • Power cable
  • Displayport cable
  • HDMI Cable

Differences between Sizes and Variants

We tested the 27" model (27UD58B-P). However, the monitor is also available in 24" (24UD58B-P). It is also closely related to the higher end 27UD68, which is available in white (27UD68P-W) and black (27UD68P-B) variants.

If someone comes across a different type of panel or if their 27UD58B-P 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 Size Refresh rate Notes
24UD58B-P 24" 60Hz  
27UD58B-P 27" 60Hz  
27UD68P-B 27" 60Hz Black variant
27UD68P-W 27" 60Hz White variant

Compared to other Monitors

LG 27UD58-B Group Shot Picture
Left: LG 27UD69P-B. Middle: LG 27UD58-B. Right: Dell U2715H.
Unlike our other photographs, this picture wasn't taken under a controlled environment, so do not draw conclusions from it.

The LG 27UD58B-P is a decent 4k monitor with an IPS screen and FreeSync support. 

Dell U2717D

The LG 27UD58-B is slightly better than the Dell U2717D. The 27UD58-B has wider viewing angles, and is better suited for gaming with much lower input lag and support for AMD's FreeSync technology. The higher resolution of the 27UD58-B makes it easier to multitask, but can be a bit more demanding on a PC. The Dell U2717D has far more ergonomic options, so it is easier to place it in a comfortable position.

LG 27UD68P-B

The LG 27UD68P-B is a somewhat higher-end model of the LG lineup. It has a slightly different design but has many of the same features such as 4k resolution, 60Hz refresh rate and FreeSync support. It can produce brighter images which may be useful for overcoming glare in a bright room. It also has a better stand which allows for easier adjustment to find a comfortable viewing position. For most people though, it is better to save the money and go with the cheaper LG 27UD58-B.

ASUS PB277Q

The ASUS PB277Q is a TN gaming monitor. It has a slightly higher 75Hz refresh rate so games do appear a bit more smooth, but lacks FreeSync support. It has excellent motion handling though, so even fast-paced games remain clear. Unfortunately, the TN panel results in worse picture quality due to the low native contrast ratio and even when viewed from directly in front, the sides of the screen look different due to the very narrow viewing angles. For only gaming, the ASUS PB277Q may be a slightly better choice but if you use it for anything else or care about the picture quality, then go with the LG 27UD58.

Acer Predator XB271HU

The Acer Predator XB271HU is a high-end gaming monitor with a 1440p IPS panel. The picture quality is in the same ballpark as the LG, but the Predator can get brighter to overcome glare and has better motion handling due to the fast 144Hz refresh rate, low input lag and ability to flicker the image (BFI) to reduce blur in fast-paced games. If screen area is most important to you, then go with the higher 4k resolution LG 27UD58, but if you can afford it, the Acer XB271HU is better in all other performance aspects.

Conclusion
SEE PRICE
Amazon.com

7.2Mixed Usage
Score components:
  • 30% Office
  • 30% Multimedia
  • 25% Gaming
  • 10% Media Creation
  • 5% HDR Gaming
Decent monitor for mixed usage. Gaming oriented features such as FreeSync and the low input lag result in a good gaming performance, but the picture quality is only passable. The sides of the image do remain accurate when viewed from up-close due to the wide viewing angles, which is good.
Above average monitor for office use. The limited ergonomic adjustments make it less convenient to show images to coworkers or to find a comfortable viewing position for long periods of time. The high resolution is a bonus for productivity and multitasking, which is good. The picture quality of the LG 27UD58-B is only passable, but the image remains accurate when viewed at an angle which is good.
Good monitor for gaming. The combination of FreeSync, low input lag and good motion handling results in a responsive and tear-free experience, which is good. Unfortunately, the 60Hz refresh rate limits the performance for fast-paced games and the picture quality is only decent.
Decent monitor for media consumption. Coverage of the most used sRGB color space is great, and the gray uniformity is good. The image also remains accurate when viewed at an angle which is great. Unfortunately, the picture quality is only passable and is limited by the low native contrast ratio and poor black uniformity of the IPS panel.
Decent monitor for editing photos or videos. The out of the box image accuracy is great, and the image also remains accurate when viewed at an angle. Unfortunately, the low native contrast ratio and poor black uniformity reduce the picture quality.
Doesn't support HDR, and also can't produce a bright or saturated image. This is common for most monitors, as HDR support is only found in high-end monitors such as the Samsung CHG70.

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