A 4K screen has a resolution of 3840 x 2160 pixels, which is also sometimes called Ultra High Definition (UHD). This is four times as many pixels as Full HD, which has a resolution of 1920 x 1080 ...
Notable resolutions include Full HD, 4K, and 8K. Resolution isn't directly influenced by other TV features, like screen technologies or video formats. Size does, however, play somewhat of a factor.