LG 27GN850-B Monitor Review

Tested using Methodology v1.1
Reviewed Jan 18, 2021 at 09:57 am
LG 27GN850-B Picture
7.9
Mixed Usage
7.8
Office
8.3
Gaming
7.8
Multimedia
7.9
Media Creation
7.0
HDR Gaming
Size 27"
Resolution 2560x1440
Max Refresh Rate
144 Hz
Pixel Type
IPS
Variable Refresh Rate
Adaptive Sync

The LG 27GN850-B is an impressive gaming monitor. It replaces the LG 27GL850-B and is an overall improvement. Gamers should appreciate the incredible response time at its max refresh rate of 144Hz, resulting in minimal motion blur, and it remains fast when gaming at 60Hz. It has FreeSync support and G-SYNC compatibility to reduce screen tearing, and the input lag is also incredibly low. It has a large 27 inch screen with a 1440p resolution, which helps deliver an immersive gaming experience without being too heavy on your graphics card. It has an IPS panel with wide viewing angles, so the image remains accurate when viewing from the side. However, that comes at the cost of a low contrast ratio, and without local dimming, blacks appear gray when viewed in the dark.

Our Verdict

7.9 Mixed Usage

The LG 27GN850-B is very good overall. It offers impressive gaming performance because it has a high 144Hz refresh rate with VRR support, the response time is incredible, and input lag is extremely low. Its 27 inch, 1440p screen makes it good for office use and content creators, and it has wide viewing angles if you need to share your screen with someone else. Sadly, it has a low contrast ratio and lacks local dimming, so blacks appear closer to gray when viewed in the dark.

Pros
  • Wide viewing angles.
  • High 144Hz refresh rate and VRR support.
  • Extremely low input lag.
  • Incredible response time.
Cons
  • Disappointing ergonomics.
  • Low contrast ratio.
  • Mediocre HDR peak brightness.
7.8 Office

The LG 27GN850-B is good for office use. Its 27 inch screen size allows you to open multiple windows at once, and its 1440p resolution delivers clear text. It has wide viewing angles, making it easier to share your screen with others. However, it has disappointing ergonomics as you can't swivel it. Lastly, reflection handling is decent, and it gets bright enough to fight glare in well-lit rooms.

Pros
  • Wide viewing angles.
  • Good peak brightness and decent reflection handling.
  • Large screen and high resolution.
Cons
  • Disappointing ergonomics.
  • Glare may be an issue in really well-lit rooms.
8.3 Gaming

The LG 27GN850-B is impressive for gaming. It has an incredible response time whether you're gaming at its native 144Hz refresh rate or 60Hz, and the input lag is incredibly low. It has FreeSync support and G-SYNC compatibility to reduce screen tearing. Sadly, it's not a good choice for dark room gaming because of its low contrast ratio and poor black uniformity.

Pros
  • High 144Hz refresh rate and VRR support.
  • Extremely low input lag.
  • Incredible response time.
Cons
  • Low contrast ratio.
7.8 Multimedia

The LG 27GN850-B is good for consuming multimedia content. Its 1440p resolution helps deliver crisp images, and it has a large, 27 inch screen. It performs well in bright rooms thanks to its decent reflection handling and good peak brightness. However, it's not a good choice for dark rooms because it has a low contrast ratio that makes blacks appear closer to gray.

Pros
  • Wide viewing angles.
  • Good peak brightness and decent reflection handling.
  • Large screen and high resolution.
Cons
  • Disappointing ergonomics.
  • Low contrast ratio.
7.9 Media Creation

The LG 27GN850-B is very good for content creators. The large screen and high resolution mean you can easily open multiple windows side-by-side, which is great for multitasking. It has wide viewing angles, so people viewing from the side get the same accurate image as if they would be directly in front. However, it has disappointing ergonomics, making it difficult to position your screen to share with someone.

Pros
  • Wide viewing angles.
  • Good peak brightness and decent reflection handling.
  • Large screen and high resolution.
Cons
  • Disappointing ergonomics.
  • Low contrast ratio.
7.0 HDR Gaming

The LG 27GN850-B is decent for HDR gaming. It has impressive gaming performance thanks to its incredible response time, extremely low input lag, and VRR support. HDR content looks alright on it because it displays a wide color gamut, but it doesn't get bright enough to make highlights pop, it has a low contrast ratio, and lacks local dimming.

Pros
  • High 144Hz refresh rate and VRR support.
  • Extremely low input lag.
  • Incredible response time.
Cons
  • Low contrast ratio.
  • No local dimming feature.
  • Mediocre HDR peak brightness.
  • 7.9 Mixed Usage
  • 7.8 Office
  • 8.3 Gaming
  • 7.8 Multimedia
  • 7.9 Media Creation
  • 7.0 HDR Gaming

Test Results

perceptual testing image
Design
Design
Style
Curved No
Curve Radius Not Curved
Weight (without stand)
9.3 lbs (4.2 kg)
Weight (with stand)
13.9 lbs (6.3 kg)

The LG 27GN850-B has the same style as most of LG's UltraGear monitors from their 2020 lineup, such as the LG 27GN950-B. It has thin borders on three sides with a thicker bottom bezel. It's mainly black with red accents throughout. Unlike the LG 27GL850-B, the V-shaped feet don't sit flat on the desk and are a bit elevated. There's cable management through the stand, and overall it's a fairly well-built monitor.

Design
Stand
Width
16.7" (42.5 cm)
Depth
11.6" (29.4 cm)

The wide stand supports the monitor well, and the feet are fairly thin, so there's enough space to put stuff in front.

5.9
Design
Ergonomics
Height Adjustment
4.3" (11.0 cm)
Switch Portrait/Landscape Yes, Clockwise
Swivel Range No swivel
Tilt Range -15° to 5°

Like most LG monitors, the ergonomics are disappointing. The tilt range is limited, and you can rotate the screen into portrait mode, but since you can only do it in the clockwise direction, the inputs would be on top. This could be an issue if you have short cables.

Design
Back
Wall Mount VESA 100x100

The back of the monitor has the same red ring found on most UltraGear monitors, but it doesn't light up. There's cable management through the hook in the stand.

Design
Borders
Borders
0.3" (0.8 cm)

The borders are thin and aren't distracting, which is great for a multi-monitor setup.

Design
Thickness
Thickness (with stand)
12.7" (32.2 cm)
Thickness (without stand)
2.0" (5.2 cm)

The screen itself is very thin, but the whole setup gets thicker with the stand attached. You may need a deep desk to put it on.

7.0
Design
Build Quality

The LG 27GN850-B's build quality is decent. It's similar to the LG 27GN950-B, and it's made entirely out of basic, plastic materials that feel solid. There aren't any obvious gaps or loose parts. The stand supports the screen well, and there isn't much wobble. However, the hook for cable management feels a bit flimsy, but this may only be a problem if you're constantly removing cables from it.

Picture Quality
5.7
Picture Quality
Contrast
Native Contrast
852 : 1
Contrast With Local Dimming
N/A

The LG 27GN850 has a low contrast ratio, which is expected from an IPS panel. Blacks appear gray when viewed in the dark, and there's no local dimming feature to help improve it. This is lower than the advertised 1000:1 contrast, but it may vary between units.

0
Picture Quality
Local Dimming
Local Dimming
No
Backlight
Edge

The LG 27GN850-B doesn't have a local dimming feature. The above video is provided for reference only.

7.7
Picture Quality
SDR Peak Brightness
SDR Real Scene
321 cd/m²
SDR Peak 2% Window
320 cd/m²
SDR Peak 10% Window
322 cd/m²
SDR Peak 25% Window
322 cd/m²
SDR Peak 50% Window
322 cd/m²
SDR Peak 100% Window
322 cd/m²
SDR Sustained 2% Window
320 cd/m²
SDR Sustained 10% Window
322 cd/m²
SDR Sustained 25% Window
322 cd/m²
SDR Sustained 50% Window
322 cd/m²
SDR Sustained 100% Window
322 cd/m²
SDR ABL
0.000

The LG 27GN850-B has good SDR peak brightness. It maintains its brightness extremely consistent across different content, and it gets bright enough to combat glare. However, this is lower than the advertised 350 cd/m². We measured peak brightness after calibration in the 'Gamer 1' Picture Mode with Brightness set to max.

6.2
Picture Quality
HDR Peak Brightness
HDR Real Scene
325 cd/m²
HDR Peak 2% Window
325 cd/m²
HDR Peak 10% Window
326 cd/m²
HDR Peak 25% Window
326 cd/m²
HDR Peak 50% Window
326 cd/m²
HDR Peak 100% Window
351 cd/m²
HDR Sustained 2% Window
296 cd/m²
HDR Sustained 10% Window
301 cd/m²
HDR Sustained 25% Window
302 cd/m²
HDR Sustained 50% Window
305 cd/m²
HDR Sustained 100% Window
325 cd/m²
HDR ABL
0.005

The LG 27GN850 has mediocre HDR peak brightness. It only gets a bit brighter than in SDR, and highlights quickly lose their brightness the longer they stay on the screen. It's not enough to make highlights pop the way the creator intended in HDR. We measured the HDR peak brightness in the 'Gamer 2' Picture Mode.

8.5
Picture Quality
Horizontal Viewing Angle
Color Washout From Left
46 °
Color Washout From Right
46 °
Color Shift From Left
55 °
Color Shift From Right
55 °
Brightness Loss From Left
49 °
Brightness Loss From Right
49 °
Black Level Raise From Left
70 °
Black Level Raise From Right
70 °
Gamma Shift From Left
61 °
Gamma Shift From Right
59 °

The LG 27GN850 has an excellent horizontal viewing angle, which is normal for an IPS panel. The image remains accurate as you move off-center, which is great if you want to use it for co-op gaming.

6.4
Picture Quality
Vertical Viewing Angle
Color Washout From Below
34 °
Color Washout From Above
34 °
Color Shift From Below
31 °
Color Shift From Above
37 °
Brightness Loss From Below
39 °
Brightness Loss From Above
39 °
Black Level Raise From Below
33 °
Black Level Raise From Above
28 °
Gamma Shift From Below
33 °
Gamma Shift From Above
33 °

The vertical viewing angle isn't bad. You may notice a loss in image accuracy if you mount the monitor above eye level.

8.7
Picture Quality
Gray Uniformity
50% Std. Dev.
3.122 %
50% DSE
0.106 %
5% Std. Dev.
0.466 %
5% DSE
0.055 %

Our unit of the LG 27GN850 has excellent gray uniformity, but this may vary between units. The edges of the screen are a bit darker, but there's no dirty screen effect in the center. Solid colors across the screen, like on a web page or document, look great. Uniformity is even better in near-dark scenes.

5.5
Picture Quality
Black Uniformity
Native Std. Dev.
2.337 %
Std. Dev. w/ L.D.
N/A

Black uniformity is poor, but this may vary between units. There's noticeable backlight bleed in the corners and clouding throughout. This could be distracting when watching dark scenes in a dark environment.

7.6
Picture Quality
Pre Calibration
Picture Mode
Gamer 1
Luminance
325 cd/m²
Luminance Settings
100
Contrast Setting
70
RGB Controls
50-50-50
Gamma Setting
Mode 2
Color Temperature
6731 K
White Balance dE
1.84
Color dE
3.72
Gamma
2.07

The LG UltraGear 27GN850-B has good out-of-the-box accuracy. White balance is only a bit off, and most colors are slightly inaccurate. The color temperature is a bit on the cold side, giving the image a blueish tint. Sadly, gamma doesn't follow the target curve at all, and most scenes are brighter than they should be.

There's an 'sRGB' Picture Mode, but we didn't use it because it resulted in a less accurate image:

  • Color Temperature: 6484K.
  • White Balance dE: 4.51.
  • Color dE: 2.84.

9.5
Picture Quality
Post Calibration
Picture Mode
Gamer 1
Luminance
100 cd/m²
Luminance Settings
16
Contrast Setting
70
RGB Controls
50-50-49
Gamma Setting
Mode 2
Color Temperature
6470 K
White Balance dE
0.76
Color dE
0.55
Gamma
2.18

The LG 27GN850 has remarkable accuracy after calibration. Any remaining inaccuracies with white balance and most colors can't be spotted by the naked eye. Gamma follows the target curve very well, and the color temperature is extremely close to the 6500K target.

You can download our ICC profile calibration here. This is provided for reference only and shouldn't be used, as the calibration values vary per individual unit even for the same model due to manufacturing tolerances.

9.4
Picture Quality
SDR Color Gamut
sRGB xy
99.8 %
Adobe RGB xy
88.8 %
sRGB Picture Mode
Gamer 1
Adobe RGB Picture Mode
Gamer 1

The SDR color gamut is incredible. It has full coverage of the sRGB color space used in most web content, and excellent coverage of the Adobe RGB color space, which is great for photo editors.

9.5
Picture Quality
SDR Color Volume
sRGB In ICtCp
97.5 %
Adobe RGB In ICtCp
92.8 %
sRGB Picture Mode
Gamer 1
Adobe RGB Picture Mode
Gamer 1

The LG 27GN850-B's color volume is fantastic. Helped by its incredible color gamut and good peak brightness, it displays colors at a wide range of luminance levels. However, it can't display deep colors due to the low contrast ratio.

7.5
Picture Quality
HDR Color Gamut
Wide Color Gamut
Yes
DCI P3 xy
80.2 %
Rec. 2020 xy
70.0 %
DCI P3 Picture Mode
Gamer 2
Rec. 2020 Picture Mode
Gamer 2

The LG 27GN850-B has a good HDR color gamut, and it's an improvement from the LG 27GL850-B. It has great coverage of the commonly-used DCI P3 color space and decent coverage of the wider Rec. 2020.

The DCI P3 coverage is much lower than the advertised 98% coverage. This is normal and is due to the way we measure DCI P3. We measure DCI P3 by sending a Rec. 2020 signal, but unlike most reviewers, we limit the colors we're sending to the DCI P3 primaries. This results in a lower, but arguably more accurate measurement.

7.1
Picture Quality
HDR Color Volume
DCI-P3 In ICtCp
78.3 %
Rec. 2020 In ICtCp
62.7 %
DCI P3 Picture Mode
Gamer 2
Rec. 2020 Picture Mode
Gamer 2

The HDR color volume is decent. Aided by its good color gamut, it displays a wide range of colors but struggles with darker colors because it has a low contrast ratio.

10
Picture Quality
Image Retention
IR After 0 Min Recovery
0.00 %
IR After 2 Min Recovery
0.00 %
IR After 4 Min Recovery
0.00 %
IR After 6 Min Recovery
0.00 %
IR After 8 Min Recovery
0.00 %
IR After 10 Min Recovery
0.00 %

There are no signs of temporary image retention on our unit of the LG UltraGear 27GN850, but this may vary between units.

9.8
Picture Quality
Gradient
Color Depth
10 Bit

The gradient handling is exceptional. There's virtually no banding with any shade.

9.9
Picture Quality
Color Bleed
Pixel Row Error
0.000 %
Pixel Column Error
0.027 %

There's some extremely minor vertical color bleed, but it shouldn't be noticeable with most content.

7.4
Picture Quality
Reflections
Screen Finish
Matte
Total Reflections
5.2 %
Indirect Reflections
2.7 %
Calculated Direct Reflections
2.5 %

The LG UltraGear 27GN850-B's reflection handling is decent, similar to the LG 34GN850-B. It performs well in moderately-lit rooms, but the reflections may be too distracting if there's direct sunlight on it.

7.0
Picture Quality
Text Clarity
Sub-Pixel Layout
RGB

The LG 27GN850's text clarity is decent. Enabling ClearType (top photo) helps improve the appearance of diagonal lines, such as on R, N, G, and S, but straight lines aren't as bold, as seen on the letters T and I.

Motion
9.5
Motion
Response Time @ Max Refresh Rate
Best Overdrive Setting
Normal
Rise / Fall Time
4.0 ms
Total Response Time
6.8 ms
Overshoot Error
0.7 %
Dark Rise / Fall Time
4.1 ms
Dark Total Response Time
6.5 ms
Dark Overshoot Error
0.0 %

Overdrive Setting Response Time Chart Response Time Tables Motion Blur Photo
Off Chart Table Photo
Normal Chart Table Photo
Fast Chart Table Photo
Faster Chart Table Photo

The response time at its max refresh rate of 144Hz is incredible. The recommended overdrive setting is 'Normal' as it results in crisp motion and minimal blur with almost no overshoot. The 'Fast' and 'Faster' settings result in too much overshoot and motion blur.

9.2
Motion
Response Time @ 60Hz
Best Overdrive Setting
Normal
Rise / Fall Time
4.1 ms
Total Response Time
9.6 ms
Overshoot Error
1.6 %
Dark Rise / Fall Time
4.3 ms
Dark Total Response Time
11.7 ms
Dark Overshoot Error
3.1 %

Overdrive Setting Response Time Chart Response Time Tables Motion Blur Photo
Off Chart Table Photo
Normal Chart Table Photo
Fast Chart Table Photo
Faster Chart Table Photo

The LG 27GN850's response time at 60Hz is outstanding. Like at its max refresh rate, the 'Normal' overdrive setting results in a lot less overshoot than the 'Fast' and 'Faster' settings, and motion looks buttery smooth. This means that you won't have to change the overdrive setting if the frame rate of your game drops.

10
Motion
Image Flicker
Flicker-Free Yes
PWM Dimming Frequency
0 Hz

The LG 27GN850-B has a flicker-free backlight, which helps reduce eye strain.

0
Motion
Black Frame Insertion (BFI)
Black Frame Insertion (BFI)
No BFI
BFI Maximum Frequency
N/A
BFI Minimum Frequency
N/A

Unfortunately, the LG UltraGear 27GN850-B doesn't have an optional Black Frame Insertion feature to help reduce motion blur.

9.0
Motion
Refresh Rate
Native
144 Hz
Max Refresh Rate
144 Hz
Variable Refresh Rate
Yes
FreeSync
Yes
G-SYNC
Compatible (NVIDIA Certified)
VRR Maximum