An apparatus for projecting high precision optical images with a selective heating source, advantageously a laser, on a writable, erasable, editable electronic slide and simultaneously or sequentially projecting the images in registration, onto a receiving surface such as a projection screen or photosensitive...http://www.google.co.uk/patents/US4818098?utm_source=gb-gplus-sharePatent US4818098 - Apparatus and method of forming and projecting high precision optical images
