What is the pixel pitch of a 4K TV?
At 100% magnification, the 3840 x 2160 pixel UHD 4K resolution can be fully utilized, but the pixel density is around 140 ppi, and the pixel pitch is about 0.18 mm, so it appears quite tiny from the normal viewing distance.
What to note about 4K displays?
Over the next several years, it is predicted that 4K will replace full HD as the mainstream resolution. 4K, of course, represents 4,000 and refers to a horizontal pixel count of around that number. There are currently two standards for 4K resolution, namely "DCI 4K" and "UHD 4K.