OLED phone screens mean brighter gaze ahead .

Who wouldn't want a cell phone with a sharper, brighter display than the color LCDs in common use today — especially if it made the phone slimmer and doubled its battery life?

Such displays, using a technology known as Active Matrix-Organic Light-Emitting Diodes, in time could even unroll from a phone in the form of a thin, flexible sheet to display vivid images, games and videos on a screen the size of a cocktail napkin or larger.

Yet even basic AMOLED displays may not be common in handsets any time soon, say some industry analysts, because of limited manufacturing capacity. The 20-year-old technology still hasn't ramped up sufficiently, even for the relatively small displays required by handsets.