Already seen that nano technology exists for these purposes, but the stuff I saw had a rubbish resolution and contrast on the screen and I imagine it would be too expensive to put into mass production at the moment.
Give it ten years I think and could definitely be a winner, the self cleaning and solar charging abilities alone are cool, but the shapes will also be maleable so can change like you see in the video from a watch to a more conventional phone shape to a keyboard.
Makes you think those badges they had to communicate in Star Trek are a bit lame though doesn't it! Plus 400 years in the future, they can travel at 10 times the speed of light yet still haven't found a solution to Jean Luc's baldness...