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Q: QuestionAt this price point, why is it only 60hz? And for those of you who don't know Tru Motion 120 or whatever they wanna call it is another word for "Fake 60hz"

Asked 5 years ago by BrianE.

• A:Answer You have to understand two important things about video. First, you can't add detail beyond what is already in the source footage. Second, the source footage is never greater than 60Hz. When you watch a movie on Blu-ray, it's a 1080p picture at 60Hz. The disc displays 60 interlaced or 30 progressive frames at 1,920-by-1,080 resolution per second of video. For movies that were recorded on film, the original footage is actually 24 frames per second, upconverted to 30 frames through a process known as 2:3 pulldown. It distributes the source frames so they can be spread across 30 instead of 24 frames per second. Those frames are then interlaced (combined and shuffled) to 60 "frames" per second to match the 60Hz refresh rate of the vast majority of TVs you can buy today. In the case of 1080p60 televisions, the frames are pulled down to 60 full frames per second, and both the players and HDTVs outright skip any interlacing step. This is a time-honored tradition, because American TVs have displayed 30 (actually, 29.97) frames per second and functioned at 60Hz since time immemorial. It's not really a problem, because between interlacing and frame pulldown, the process doesn't attempt to add information to the picture. It's simply converting it to function on the TV, because it wouldn't work otherwise. Once an HDTV's refresh rate goes above the rate of the content you're watching, it starts performing tricks to produce a higher frame rate. It interpolates new frames between the frames transmitted to the display at 60 frames per second (or processed into 60 frames per second from 24 frames per second for film footage, through the separate pulldown process), and the HDTV fills in the spaces by generating the best "middle" frames to stick in the cracks. These new frames are made by combining and processing the data of the frames surrounding them, generating the images the HDTV thinks it should draw between the images it's told to draw by the media. You're looking at more individual pictures as the screen draws them, but these pictures weren't on the Blu-ray disc or television signal that the screen is receiving; the HDTV is generating those additional pictures itself. TruMotion 120 or whatever name any TV manufactures use for it is what is known as Motion Interpolation and it should not be mistaken for the TV's native refresh rate which is 60 Hz for the LG UHD 73 Series 75 inch Class 4K Smart UHD TV with AI ThinQ® (74.5'' Diag), Model # 75UN7370PUE. The HDMI 2.0 standard made 60 fps 4K video a consistent possibility for certain devices, and so much processing is already being used on simply displaying the much higher 3,840-by-2,160 resolution and added interpolation and adding frames to make the action smoother. Enhanced refresh rates can go too far. While 120Hz refresh rates seen on most midrange HDTVs can work well, don't expect to see any real performance improvement from 240Hz refresh rates. Refresh rates and motion-enhancing modes higher than 60Hz can produce a surreal effect when watching movies and television shows. The additional frames and "smoother" animation looks different from what we're used to with TV and movies, making the footage appear strangely fast. For any sort of content where you watch people interact naturally, like comedies or dramas, this can be unsettling and you should consider turning off the motion enhancing mode and force the screen to display the picture at 60Hz. However, for sports and video games, those added frames can help reduce stuttering and blur, and the action will be easier to track. s a general rule, if what you're watching involves seeing real peoples' faces as they talk, disable the higher refresh rate so they don't look like creepy dolls (also known as the "soap opera effect"). If what you're watching involves seeing real people run into each other (sports), or fake people attacking each other in an artificial environment (video games), keep the higher refresh rate mode turned on...^IFV

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  Answered 5 years ago by LG Digital Customer Care

  
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