Market analysis, wishful thinking, or both? Whichever the case, Samsung’s 2017 flagship might very well bear, not the first, a 4K screen. That is the prediction being made by some analysts like UBI Research, based on trends and current production capabilities. While Sony was really the first OEM to have a 4K smartphone with the Xperia Z5 Premium, Samsung might have a better use case for that extreme high pixel density beyond simple video or photo viewing: virtual reality.

In truth, Samsung already does have a display panel that seems poised for that role. At the Display Week conference last week, the Korean manufacturershowed off a “high resolution for VR” screen that measured 5.5 inches and had an astounding 3840×2160 resolution, a.k.a. 4K. The screen size is a bit larger than the usual Galaxy S flagship, but considering the resolution, something has to give. Of course, it is entirely possible that Samsung would be able to manufacturer a smaller panel by the time the Galaxy S8 comes around.
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https://www.slashgear.com/samsung-galaxy-s8-could-get-4k-screen-08443334/