A display apparatus is disclosed comprising a passive display; a light source to provide illumination of the passive display; a video signal input, wherein in response to a video signal the passive display modulates light from the light source to provide an image, and wherein the intensity of light provided...http://www.google.com.au/patents/US7843418?utm_source=gb-gplus-sharePatent US7843418 - Optical display system and method, active and passive dithering using birefringence, color image superpositioning and display enhancement with phase coordinated polarization switching
