A few tiny pocket sized projectors have been seen around the trade shows over this last year. The latest one comes from 3M who are actually about to officially launch the product. The pocket projector is named the MPro110 mini Projector.
This mini projector will cost $359 when it is launched. It will require a fairly dark room for best quality as the power of this device isn't the greatest which is to be expected of a projector that fits in to your pocket. Sound is also not available from the device, so external speakers will be required for watching movies.
The technology that runs this pocket projector is an LCoS (Liquid Crystal on Silicon) screen with the light being provided by LED. It is due to be launched later this month and 3M are expecting to see mobile phones with this technology built in by next year.
Via: PopSci