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.
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.
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.
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.
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.
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.
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.
This monitor does not feature a local dimming option. The video is for reference only.
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.
HDR is not supported.
When viewed from the top or bottom, the image remains accurate which is great. This is almost the same as the LG 27UD68P-B.
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.
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.
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.
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.
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.
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.
HDR is not supported.
HDR is not supported.
Perfect score on the image retention test for this LG monitor as no image retention could be noticed at all.
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.
When displaying large swaths of a single color no issues can be seen with the color bleed performance.
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.
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.
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.
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'.
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.
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|
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.
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.
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.
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.
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.
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.
The LG 27UD58B-P is a decent 4k monitor with an IPS screen and FreeSync support.
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.
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.
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.
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.