QHD is a screen resolution that measures 2560 x 1440 pixels and has a 16:9 aspect ratio. You'll often find it on high-end devices like laptops, TVs, and smartphones. QHD is sharper than regular HD ...

A 4K screen has a resolution of 3840 x 2160 pixels, which is also called Ultra High Definition (UHD). This is four times as many pixels as Full HD 1080p, which has a resolution of 1920 x 1080.