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A UHD or 4K display is one with at least 8 million active pixels. For televisions, that resolution has standardized to 3,840 by 2,160. Digital cinema 4K (the resolution in 4K movie theaters) is slightly higher at 4,096 by 2,160.Is retina better than 4K resolution?
Retina displays have little to do with the resolution. It’s just a resolution where at eye level you won’t see any pixels, while 4k TVs (really UltraHD, because they’re 2160p tvs not 4k tvs), can show pixels if the TV is large enough.What is 4K resolution vs 1080p?
4K is known as Ultra High Definition (UHD), whilst 1080P is simply labelled High Definition. As their names imply, 4K UHD has a considerably higher resolution than 1080P HD video. 4K resolution is exactly 3840 x 2160 pixels, whilst 1080P consists of 1920 x 1080 pixels.