The small screen of a cellphone is not the best way to show off your photos and video clips. A pendant-like image projector hung around your neck is the solution, say Hewlett-Packard. The dangling battery-powered device, about the size of a walnut, will beam an enlarged view of the phone’s screen onto any nearby surface (patent application WO 2004/34699), enabling several people to view it.
The projector gets data via a Bluetooth radio link and a bright LED produces a light beam. Reflected from a small moving mirror, this rapidly traces out a series of horizontal lines to make up…
