Remember when just a few short years ago, the smartphone industry was shifting from 720p (1280x720px) to 1080p (1920x1080px) displays and we thought: What for? We don't need so much resolution just to read text and see pictures off the screen, right? Well, no one would have predicted at that time that we'd be sticking our phones into VR headsets to enjoy an immersive virtual reality experience powered by our everyday smartphones and the displays they power. The demand for 4K (3840x2160px) has since sky-rocketed. Especially with Google recently announcing its VR platform called Daydream...
Source: http://www.gsmarena.com/samsung_built_a_55_inch_4k_smartphone_screen_for_vr-news-18465.php
