05816675 is referenced by 5 patents and cites 32 patents.

An optical projector is described that orients its optics engine preferably vertically within an enclosure that is higher than it is wide or deep. The invented optics engine uses a prismatic cube for color separation or beam splitting, with the prismatic elements within the cube being secured within a durable frame that mounts the three color light valves, e.g. twisted nematic liquid crystal display (LCD)-type shutters, in a predefined position and orientation relative to the prismatic cube. In order to improve image quality and brightness, especially of the notoriously difficult-to-reproduce green color, red and blue beams are S polarized, as is conventional, but the green beam is P-polarized. The invented optical projector preferably includes a frame having a footing portion for resting on a support surface, a light source high above the footing portion, optical convolution structure downstream from the light source for reverse-bending downwardly flowing light from the source, light modulation structure near the reverse bend region for infusing the light with image information and for directing modulated light upwardly in a projectable, image-containing stream of light and outward-projection directing structure high on the frame for receiving and outwardly directing such stream of light.

Title
Optical projector
Application Number
590395
Publication Number
5816675
Application Date
January 14, 1997
Publication Date
October 6, 1998
Inventor
David Payne
Hillsboro
OR, US
Gary Kingsley
Tigard
OR, US
Steve Brice
Portland
OR, US
Agent
Skjerven Morrill MacPherson Franklin & Friel
Assignee
Delta America
CA, US
IPC
G03B 21/14
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