Want the perfect TV? Here are six reasons not to move to 4K UHD, especially with an OLED TV.

#6 Upgrading from 1080p to 4K OLED is expensive, $1,500 USD and up for a current model.

#5 OLED screens are subject to burn-in, where the pixels in certain areas of the screen wear out and may be permanently dimmer than their neighbors (see videos online about this including the latest "rTings" evaluation.

#4 While 4K UHD content (especially disks) can look better than 1080p FHD (ex. Bluray) content, you will need very, very good viewing conditions to notice much difference, especially since much 2160p 4K content is upscaled from 1080p 2k. To see the improved quality, plan to sit about the same distance from the screen at the width of the TV.

#3 Due to OLED screens showing each frame of a film for 1/24th of a second, motion will appear to "stutter". This is due to each film frame being exposed and recorded for typically 1/48th of a second, with the next 1/48th of a second NOT being recorded on film/digital. Displaying each 1/48 recorded frame for 1/24th of a second introduces "stutter".

#2 OLED TV's, such as the 2018 LG C8 feature "motion interpolation" which will create intermediate frames between each of the 24 frames per second in film content, which creates a very smooth "soap opera" effect. The downside is that fast motion and action scenes, especially with many objects moving in different directions (and turning) are impossible to properly calculate, leading to digital artifacts / blur / pixilation. The more frames that are interpolated between the 24 actual frames, the greater the pixilation.

#1 In a cinema, each frame is displayed for half of the 1/24 of a second, by displaying the frame for 1/144th, then a "black frame" for 1/144, and repeating that three times. On OLED TV's with real 60 Hz or 120 Hz refresh rates, inserting black frames can improve the motion, but will introduce "judder". This is due to a 3 to 2 ratio between the even and odd number frames, or the requirement to add an interpolated frame 2-1-2.

OLED is not yet perfect, and 4K might not be worth it, but perhaps it is the best that is available at the moment. If you go in with your eyes open before the purchase, perhaps your expectations will better match reality.. :-)

2021/01/08 Update

Two years later, this is still our one and only TV, with usage averaging about 1-2 hours per day. Issues with motion are reduced (but not eliminated) by increasing the distance from the screen, but this, of course, defeats the point of viewing 4K UHD content. In OLED's defense, the perfect black levels and black framing bars (whether 4:3 or 2:1 or whatever) is greatly appreciated. To minimize the possibility of burn-in, the screen is turned to minimum brightness during video gaming, and gaming is limited to a maximum of 2 hours per day. If LG resolved the stutter & judder issues by having the TV switch to 144Hz with black frame insertion every 144th when playing 24fps content, that would probably look amazing on an OLED screen, and would be appreciated by more than one.

2021/01/15 Links

I don't recall the original article I read about how the movie projectors use(d) inserted 3 black "frames" into each frame of film to eliminate flicker, but below are some related articles.

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Sometimes this is described at 72Hz black frame insertion, which while true, missed the point that there are 144 different different "images" per second, half which are the filmed frames, the other half which are black frames. Out of the 24 frames per second, each frame is displayed three times, alternating with three black frames.

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