A color display system including a display device for four or more visible color primaries and a processor for controlling the four or more color primaries to selectively render portions of an image or image sequence such that visually equivalent colors displayed in two or more image portions differ...http://www.google.com/patents/US7362336?utm_source=gb-gplus-sharePatent US7362336 - Four color digital cinema system with extended color gamut and copy protection
