Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Patent
1993-04-30
1997-04-15
Gross, Anita Pellman
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
349 8, G02F 11335
Patent
active
056215517
ABSTRACT:
An LCLV projection system (10) includes color separation dichroic mirrors (50, 52) positioned between a group of reflective liquid crystal light valves (38, 40, 42) and a polarizer analyzer (26) which enables a single projection lens (34) to project all colors via a light beam of single linear polarization with a high degree of contrast, efficiency and color separation. The polarizer analyzer (26) directs a light beam with a single polarization state to a pair of dichroic filters (50, 52) which separate the beam into three different colors that are sent to three different reflective liquid crystal light valves (38, 40, 42). The light valves reflect the respective colored light beams with change in polarization state back to the dichroic mirrors (50, 52) which combine the three colors into a single combined multi-color beam that is fed through the polarizer analyzer (26) to a single system projection lens (34). The polarizer analyzer (26) and dichroic mirrors (50, 52) are enclosed in a fluid filled enclosure (28) containing an optical fluid which has an index of refraction substantially the same as that of the substrate of the dichroic mirrors (50, 52), for effectively increasing the back focal length of the projection lens (34).
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Gagnon Ralph
Henderson Alan R.
Gross Anita Pellman
Hughes-JVC Technology Corporation
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