The LG UH6100 is an entry level 4k TV. It includes a less accurate pixel structure (RGBW) which means that although it has the correct number of pixels, it can't produce the same level of fine detail as other 4k TVs. Despite this, the picture quality is average. Motion is handled quite well and the smart platform works well.
The design is very similar to the LG UF6400 from last year, but with more modern narrower legs. It is a fairly bland TV, which isn't necessarily a bad thing. It feels well supported and sturdy.
Picture quality of the LG UH6100 4k IPS display is average. The low contrast ratio and the bad black uniformity results in worse dark scene performance, with the black appearing more gray than really black. The gray uniformity is also problematic with this TV. The advantage of the IPS panel is that the picture quality remains similar when watched at an angle. Upscaling of low quality content such as DVDs or cable is very good.
The contrast ratio is average for the UH6100. The blacks are not very deep but that is not the worse that we have seen for an IPS panel. This is going to be a problem if you always watch TV in a dark room, but for a well light room, it shouldn't be a problem.
Update:There are reports of a local dimming feature appearing temporarily in the menus, this is a bug and will most likely be fixed soon. We were not able to reproduce it.
The SDR peak brightness is bad and is about 100 cd/m² less than what the TV can reach when in HDR mode, which is not very bright, especially when set in a bright room.
When sending an HDR signal, the overall peak brightness is average but quite good for a mid-range TV. It has around the same brightness as the Samsung KU6300. At around 400 cd/m² it is still decent for highlights bigger than 50% and is bright enough to watch in a bright room without problems, but it won't make HDR look as good as on higher end TVs that can get small highlights more bright.
The gray uniformity is pretty bad for a LED TV. You can see on our test picture that the corners are a lot darker and there is also half of the screen that has a bit of a pink hue. This will result in a dirty screen effect when watching some content like sport, where you often have big panning shots or in video games where the background is a uniform color. Note that the gray uniformity issues are more obvious when you watch the TV from the side.
The viewing angle is above average, but not the best we have seen for an IPS panel. When viewed from the side, the color tends to remain the same, but loses intensity.
Update: We have changed the methodology of testing. Since this is an old TV which we don't have anymore, we extrapolated the results.
The black uniformity is really bad for the LG UH6100. There is some major clouding leaving only the side of the screen really black. This is one of the worst TVs we have tested for the black uniformity yet in 2016.
The color gradient is pretty good for an 8 bit panel. There are not any banding issues that we can see from our gradient pattern. The only little imperfections that you can see when looking at the picture are more related to the gray uniformity.
Update 09/30/2016: Our original test was showing an incorrect color depth of 8 bit due to some incorrect drivers on our system, but after some correction to our test apparatus, we tested again the color depth and we can confirm that the LG UH6100 does in fact have an 10 bit panel.
Prior to calibration, the colors and the white balance aren't perfect but performance is good enough for most people.
The 2 and 20 point calibrations make it easy to fix inaccuracies. The result is quite good. You can find our calibration settings here.
Uses less accurate RGBW pixel substructure. This is not an issue from further away, but from close up text may look strange. An example is shown here.
Although there is an option to enable an 'Extended' color gamut, it is only enough for rec 709 content. Even though it accepts a HDR signal, the colors will not benefit from it.
The UH6100 can’t produce saturated colors to improve HDR content. At low luminosities the range of colors is poor.
The semi-gloss finish helps to diffuse reflections. Deals quite well with reflections in an average lit room, but very bright glare may be an issue.
This TV doesn't support 3D.
The UH6100 provides good performance with motion. It features a 60Hz panel which can interpolate 30 fps content, for those who like the soap opera effect. Motion blur is also great, with only a short trail following moving objects. Movies played over a blu-ray player experience no judder.
The response time is great. Due to the flickering backlight, a few faint images can be seen following the logo. This should not be a problem.
24p content as movies from Blu-rays, DVDs and from streaming apps like Netflix will play without judder with the 'Realcinema' option turned-on. Movies playing on a cable/satellite box do have some judder issues, but this is not noticeable to most people. Even with the 'TruMotion' option set to 'User' and with 'De-Judder' set to max (introducing the soap opera effect), judder was still present.
The UH6100 has a 60Hz panel, and so can only interpolate up to 30Hz content. To do this, set 'Trumotion' to 'User' and increase the 'De-Judder' slider. This does not completely remove judder, however.
The input lag is quite low, which should good for most people. The UH6100 supports a wide range of resolutions, and displays clear text due to chroma support. There is a good range of inputs, but unfortunately most of them are hard to access if wall mounted.
1080p input lag is quite good for the LG UH6100. For casual gamers out there, with only 39.7 ms of input lag, the UH6100 should be a good choice. Change the input icon to 'Game Console' and select the 'Game' picture mode for lowest input lag.
Update 01/10/2017: The UH6100 just got a new update (04.30.82) that added a new 'HDR Game' mode and it greatly upgraded the performance of this TV. Note that input lag under gamer mode with a 1080p and 4k resolution was also reduce under 20ms.
Change the input icon to 'PC' to enable chroma 4:4:4. With this enabled, input lag is 71.9 ms. 4k @ 60Hz requires 'HDMI Ultra HD Deep Color' to be enabled, in 'General' settings. Text is not as clear due to the alternate pixel structure as can be seen here. This is penalized in the '4k Resolution' section of the review.
Bad sound performance. Distortion is present across all volumes. Even a cheap sound bar is recommended for people that care about the sound quality.
Note: Sound Quality test for TVs reviewed before 2017 was performed at 75dB, 85dB, and Max SPL. Starting 2017, the target SPL levels have been changed to 70dB, 80dB, and Max dB SPL.
Average performance. The frequency response is below average, and there will be pumping and compression present at louder volumes. However, the maximum loudness and low-end cut off are quite decent for a TV.
Poor harmonic distortion performance. Although there is not a dramatic jump in distortion as the volume is increased, the overall amount of harmonic distortion is elevated at all levels.
The WebOS Smart interface is one of the best you can find on Smart TVs and the iteration on the LG UH6100 is very good. The interface looks great and is easy to navigate, with plenty of content and apps to chose from. The interface feels fast and without hiccups. From the smart platform, you can easily switch from live TV to any connected device like your computer, Blu-ray player or even browse your pictures and videos collection on a USB flash drive.
There is a basic remote supplied, which is straightforward to use. It is the same remote as many other mid-range LG TVs such as the LG LH5750.
We tested the 43" (43UH6100). For the most part, we expect our review to be valid for the 49" (49UH6100).
If someone comes across a different type of panel or if their LG UH6100 doesn't correspond to our review, let us know and we will update the review.
The LG UH6100 offers an average picture quality, but at a low price. For watching TV shows in a bright room it may be a good pick, but for most people the recommendations below provide better performance.