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A TV set with a screen resolution of 3,840 horizontal and 2,160 vertical pixels (2160p). Also called "Ultra HD" or "UHD," most high-end TVs today are 4K TVs. With four times as many pixels as HDTV, 4K TVs use algorithms to "fill in the blanks." They upscale DVD (480p), Blu-ray (1080p) and cable TV (1080i) content to 2160p, which provides better visual quality especially noticeable on screens 55" and above. See Ultra HD Blu-ray.

Native 4K Content Makes a Difference
Movies shot with 4K cameras are native 4K, and they will always look the best on a 4K TV. Although some first-time users find little difference between native 4K and upscaled 2K content, it is very dependent on the type of imagery in the video frames. In addition, upscaled 2K content may be misrepresented as native 4K.

When 4K TVs emerged in 2012, Sony offered a few 4K feature films on a hard disk player for its 84" TVs and later offered a paid download service. As of 2016, cable and satellite providers are beginning to offer 4K set-top boxes, although 4K content is limited.

4K TVs Make Passive 3D TVs Better
Although passive 3D TVs have 1,080 lines of resolution, 540 lines are dedicated to each eye. With the 4K's 2,160 lines, a passive 4K 3D TV is able to provide the full 1080p resolution to each eye (see 4K 3D TV). See 4K resolution, 4K upscaling, 4K pass-through, 4K monitor and 2K TV.

High-Definition Resolutions2K    1920x1080 (see  DTV)

   4K    3840x2160

   5K    5120x2880 (see  5K monitor)

   6K    6144x3160 (see  6K resolution)

   8K    7680x4320 (see  8K TV)

Sony FMP-X1 4K Media Player
In 2013, Sony introduced its 4K movie download service and FMP-X1 media player. Ten inches in diameter with USB ports and an SD Card slot, the unit's hard drive came preloaded with 10 feature films. It was superseded by the FMP-X10.
References in periodicals archive ?
So basically any 4K panel is a screen having a resolution of 2160p (as notable video guru Joe Kane insists to do off with the confusion).
Also, previous generations of video wall displays were able to daisy chain only 1080p resolutions; whereas the X555UNS and X555UNV displays can now daisy chain up to 2160p, allowing 4x the resolution across the entire digital canvas.
Full HD videos can be taken at 60 frames per second; 2160p at 30 or 24 frames per second and 720p at 120 frames per second.
Our HEVC encoder and decoder solution onTI multi core C66x DSP platform supports HEVC Main profile and Main Still profile encoding and decoding of 1080p @ 60fps and 2160p @ 30fps.
The biggest fallers were Travis Perkins down 57p at 2160p, Sports Direct down 8p at 803.
The i58B is capable of High-definition video output at 720p, 1080p, and 2160p and multi-channel digital audio.
three-dimensional graphics with high-definition video resolution up to 2160p,"
5p at 637p and 35p at 2160p respectively, despite oil prices easing back from last week's record on renewed economic fears in the US.
5p to 1042p, while lifting prospects for the rest of the sector as Antofagasta added 102p to 2160p, BHP Billiton cheered 48.
Best Buy - LG 55C[thorn] 2160p 4k LED Smart Ultra HDTV $699.
Our HEVC encoder and decoder solution on TI multi-core C66x DSP platform supports HEVC Main profile and Main Still profile encoding and decoding of 1080p at the rate of 60fps and 2160p at the rate of 30fps.