This invention provides a high efficiency polarized light source and system for the projection of 3D motion pictures adaptable to a standard motion picture projector device. The projected light beam is compressed into a shape more nearly approximating the aperture shape so that substantially less than...http://www.google.com.au/patents/US4372656?utm_source=gb-gplus-sharePatent US4372656 - High efficiency optical projector for 3D motion pictures
