An image display method and apparatus in which a laser beam is modulated to vary in intensity in response to electric or electromagnetic signals received and is traversed along a photosensitive film carried on a rotating carriage by means of a stepwise driven, friction damped carriage synchronized with...http://www.google.com.au/patents/US4028732?utm_source=gb-gplus-sharePatent US4028732 - Apparatus and method for display of images
