A projection-type display device for producing a well balanced color image without the use of a neutral density filter. The device includes three liquid crystal light valves associated with the three primary colors and two dichroic mirrors. A light source generates colored light. The optical length between...http://www.google.fr/patents/US4909601?utm_source=gb-gplus-shareBrevet US4909601 - Projection-type color display device with light valves positioned at unequal distances from the light source
Projection-type color display device with light valves positioned at unequal ...
