At the moment both the iPhone 4 and the iPhone 4S' Retina display packs a pretty impressive 326 ppi, although that number may soon be overtaken thanks to a new technology demonstrated by Japan Display. This new technology will feature a 1280×800 resolution, which some of you might be asking, so what. Well consider this – Japan Display's technology has managed to cram a display resolution of 1280×800 into a screen size of 2.3" across.
Ubergizmo, Japan Display shows off 651 ppi display
