TinyProjector

The whole project documentation...

http://web.media.mit.edu/~stefanm/TinyProjector/TinyProjector.html

They say:
"The basic idea is to build a small portable character projector, based on inexpensive laser diodes, that is able to project a single line of text onto nearby walls, tables, and other surfaces. This would be useful for projecting text from portable and wearable devices, e.g., cellphones, PocketPCs, etc., that are connected via serial port (wireless) or Bluetooth."