Projection-type liquid crystal display device with even color
Patent 4904061 Issued on February 27, 1990. Estimated Expiration Date: 
April 14, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 14, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorAssigneeApplicationNo. 338521 filed on 04/14/1989US Classes:349/8, Plural light path projectors353/25, SELECTIVE DATA RETRIEVAL353/31, Multicolor picture353/33, Prism353/34, Plural projection paths with single light source353/122MISCELLANEOUSExaminersPrimary: Miller, Stanley D.Assistant: Gallivan, Richard F. Attorney, Agent or FirmForeign Patent References
International ClassG02F 001/13Foreign Application Priority Data1984-10-22 JPAbstractA projection-type display device for producing a faithful colored synthesized image based on equating the luminous intensity distributions and light patterns produced by three twisted nematic liquid crystal light valves for three primary color images. Each light valve includes a twisted nematic liquid crystal composition which is twisted to the right or left depending on the number of times that color light is reflected. Each light valve may include an active switching matrix arranged in mirror-like symmetry with light shield layers also arranged symmetrically.Other References
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