Well, Hitachi has just unveiled an IPS LCD display that appears to be capable of bringing the glasses-free 3D experience to the next level. The panel may be only 4.5 inches in diagonal, but packs the impressive resolution of 1280 by 720 pixels, which is a step up from what one would see on a contemporary 3D-enabled device. Besides that, a quick calculation shows that the display clocks in at 326 ppi, which means that it should be able to deliver images as sharp and detailed as they look on the iPhone 4's Retina display, at least in 2D mode.
brighter in 3D mode than it is when displaying 2D images. That is accomplished thanks to the more efficient lenticular lens technology, which has been used instead of the parallax barrier method in creating the stereoscopic 3D effect.
It has not been said when Hitachi's display will become available or will it ever make it to a commercial device at all. However, that probably depends on whether there will be sufficient demand for the technology, and our poll from not long ago indicates that the market is simply not that crazy about 3D-capable smartphones just yet.
source: Hitachi (translated) via GSMArena