Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Patent
1995-11-28
1999-06-29
Sikes, William L.
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
G02F 11335
Patent
active
059175605
ABSTRACT:
A liquid crystal projector and color beamsplitter that comprises a single X-cube beamsplitter that transmits both incident and exit light beams. One half of the beamsplitter divides incident white light into three primary colors, and the other half of the beamsplitter combines the primary colors to produce white light that is used for projection. More specifically, the projector comprises a light source for projecting white light, and the color beamsplitter is disposed to receive the white light. The beamsplitter comprises four (right angle) prisms that each comprise a base and two sides, and that are disposed such that the sides of the prisms are adjacent each other. The incident white light is separated by the prisms and coupled along three separate light paths corresponding to red, green and blue light paths. Apparatus such as a plurality of mirrors, or an optical link, for example, are provided for coupling the red, green and blue light back toward the beamsplitter. The red, green and blue light returned toward the beamsplitter is combined by the beamsplitter to produce white light that is transmitted as projected light.
Dudek James A.
Lenzen, Jr. G. H.
Raytheon Company
Schubert W. C.
Sikes William L.
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