Micro and Nano Portable Projectors are not ready for prime time but will ultimately dominate small group projector needs.
Q: How does the nano projector work?
A: The nano projector engine is based on a technology called Laser Projection. In this technology, a laser-based light source is used as the illuminator for a micro display (0.24" diagonal) that acts as a transparent dynamic slide generating the image to be projected. This light is then magnified trough a projection lens and is projected on a screen or wall. Full Article