Silver screen saver

Hollywood wants cinemas to use huge video projectors to save the cost of
distributing prints of its movies around the world. Past attempts relied on
bouncing coloured laser beams off mirrors, but they failed because the laser did
not reproduce natural colours and had to be dangerously intense. Infineon
Technologies of Munich thinks it has a better idea: turn the cinema into an
enormous TV set (WO 01/52555) by coating the cinema screen with phosphorescent
dots that glow red, green or blue when lit by white light—rather like a
TV. The projector varies the intensity of a single white…