Optics: image projectors – Composite projected image – Multicolor picture
Patent
1993-11-08
1994-12-20
Cuchlinski, Jr., William A.
Optics: image projectors
Composite projected image
Multicolor picture
353 34, 353 38, 353 20, 359 40, 348757, G03B 2100
Patent
active
053749685
ABSTRACT:
A high-efficiency optical system for use in a liquid-crystal light-valve video projector. High intensity, unpolarized white light is separated into primary color components by color-selective filters transmitting light containing both first and second polarization states. Light of each primary color is characterized by a wavelength passband whereby the endpoints of the passband are defined by first and second wavelengths. The second passband endpoint of the first polarization state of the first primary color overlaps the first passband endpoint of the second polarization state of the second primary color, and the second passband endpoint of the second polarization state of the second primary color overlaps the first passband endpoint of the first polarization state of the third primary color. In addition, the video projector design utilizes low f/# optics in conjunction with absorptive polarizers to remove residual light of an unwanted polarization state allowed into the system by the low f/# optics. This allows high brightness with high efficiency and without sacrificing contrast.
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Ledebuhr, Arno G.; "Full-Color Single-Projection-Lens Liquid Crystal Light-Valve Projector"; SID 1986 Digest; pp. 379-382.
Harrison Douglas H.
Haven Duane A.
Vollmer David W.
Cuchlinski Jr. William A.
Dowling William C.
Greyhawk Systems, Inc.
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