Television – Video display – Projection device
Patent
1993-05-20
1995-03-14
Groody, James J.
Television
Video display
Projection device
348782, 348761, 348764, 359 45, 359210, 353 31, H04N 306, H04N 308, H04N 300
Patent
active
053980824
ABSTRACT:
A video projection system employs a reflective light valve (10) that is optically addressed by an image from a cathode ray tube (12) and provides an output image for projection by means of a high intensity reading light directed to the output face of the liquid crystal light valve. Improved reading illumination is provided by scanning the face of the liquid crystal light valve (10) with a narrow beam of light (80) that moves across the liquid crystal in synchronism with the scanning image from the writing CRT (12). The scanned narrow band (80) of illumination is provided by a circular sequence of three quasi cylindrical lens (56, 58, 60) or mirrors (56a, 58a, 60a) mounted on a rotating wheel (52) and which may be made of sequentially different colors to provide a color display. Rotation of the lens or mirror bearing wheel (52) is synchronized with the vertical sync of the CRT scan, as are the index positions of each of the three lens or mirror segments on the wheel.
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Filia Richard M.
Henderson Alan R.
Groody James J.
Hughes-JVC Technology Corporation
Metjahic Safet
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