Ultra HD is a resolution between 4:2:0 and 4:3:0 (4K is a resolution of 3840×2160 pixels).
In a nutshell, Ultra HD offers 60 frames per second (the current high definition standard) and also supports variable refresh rates. It is the next step since the video you are watching now is a bit stretched, compressed and sharpened, as well as there are two modes of refresh.
The next part was to define what was Ultra HD, but first, what is 4K?
What is 4K?
4K is actually a much better description of what 4K is. 4k refers to a 4:4:4 pixel-per-inch (ppi) resolution. The higher the pixel count, the better a display can display it. 4K is usually defined in terms of a pPI (Pixels Per Inch). The more pixels, the better.
Here is a picture of a 4K TV, and that is where we start to get into the technical and scientific terms regarding Ultra HD.
In the case of TVs, pixel count is a very important number. This can be seen by the following:
4k TV uses much more than 1080p or even 720p resolution, yet it still holds the title of highest definition, since it still holds 2,048 x 1,536 pixels.
What are the specs?
The specs for 4K televisions are as following:
Samsung OLED TV (40″ model, UHD): 60p (30Hz), 144Hz, 100nits, 4K (3840 x 2160)
Sony VAIO Z: 60p, 120Hz, 100nits, 4K (3840 x 2160)
Sharp 4K TV: 120Hz, 60p, 144Hz, 100nits, 4K (3840 x 2160)
LG 4K TV: 120Hz, 45p, 120Hz, 200nits, 4K (3840 x 2160)
Note: While many TVs have a 4:3 or 4:4 format, there are only some notable exceptions like the Samsung, Sony and LG. They all use a 4:3 standard and use a variable refresh rate to make the video look great.
What is Ultra HD?
Ultra HD (4K Ultra HD) is 4K resolution (3840 x 2160 pixels) with
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