Television – Video display – Projection device
Patent
1994-08-02
1999-01-26
Peng, John K.
Television
Video display
Projection device
315225, 348334, 348745, 348761, 348766, 352140, 353 57, 353 85, 353101, H04N 574, G03B 1720
Patent
active
RE0360600
ABSTRACT:
A video projection system having a liquid crystal panel with a video image, a projection lamp with ON/OFF control, a zoom lens with a zoom control mechanism, a focusing lens with a focusing control mechanism, an audio system with a volume control, a projection-lamp light detector, a heat sensor, a variable-speed cooling fan, a control module having a microprocessor and a digital-to-analog converter, a display, a keypad, an alarm/annunciator, a power supply with ON/OFF control, and an infrared based remote control system able to control power ON/OFF, zoom, focus, picture, and sound volume.
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Kohzai et al, "Liquid Crystal Color Video Projector", International Television Engineering Journal (ITEJ), Technical Report, vol. 13, No. 53, pp. 49-54 (Oct. 27, 1989).
Miller John W.
Peng John K.
Seiko Epson Corporation
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