If you have spectacularly good eyesight, the highest pixel-density you can see is about 500 pixels-per-inch (ppi). But that trifling little detail isn't stopping display manufacturers and marketers, no sir! Sharp just revealed an iPhone 5s-sized (4.1-inches) IGZO LCD screen with WQXGA (2,560 x 1,600) resolution. That works out to 736ppi -- a quantum leap above Samsung's Galaxy S5 LTE-A, the current smartphone champ at 576ppi. You'll see devices with the screen starting in 2016, but it may lose its density crown before then anyway. Samsung is rumored to have a 5.9-inch, 4K Super AMOLED display with 747ppi in the works. Better eat those carrots.
Update: We've updated the post to note that it's the iPhone 5s that has a 4-inch-sized screen, not the iPhone 4s.