“Why does the tv say only 2160 in 4K???...shouldn't it say 4000?”
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4K display has to consist of at least 3,840 pixels (horizontal) x 2,160 pixels (vertical) of resolution and the horizontal can go above 4,000 pixels. This puts it on the top of the current scale of digital resolutions in which the bottom is occupied by standard definition TV (450X540 pixels), HD with 720 pixels and full HD at 1080p. So, 4K's 3840 x 2160 pixels provides 4 times the number of picture elements (pixels) as that provided by HD's 1920 by 1080. The industry has been using the number of horizontal lines of a display as a standard of comparison: 720p, 1080p, and now 2160. "4K" is just a a convenient and catchy term to approximate of the number of vertical lines of resolution and market the improved picture technology. In simplest terms, if you measure HD resolution by vertical pixel height (720p, 1080p) then 4K UHD can also be called 2160p. As you can see, 4K outstrips its best HD predecessor by a very wide margin in creating a resolution profile that’s two times wider and two times higher than 1080 HD, thus giving a total screen resolution that’s a bit over 4 times larger overall, thus its name, 4K ultra HD.
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