Optics: image projectors – Miscellaneous
Patent
1995-06-27
1997-01-14
Dowling, William C.
Optics: image projectors
Miscellaneous
353DIG3, 353 60, G03B 2116
Patent
active
055932215
ABSTRACT:
An overhead projector for use with a flat panel display assembly. The specialized overhead projector provides cooling for the LCD flat panel when used in an overhead projection configuration. The projector contains a rail on which the flat panel display is positioned for alignment and to provide air passage there through for cooling. A clamping mechanism is also described for securing the flat panel display to the projector. The flat panel display is a back-lit flat panel display subsystem for direct viewing as a monitor and also has overhead projection capability. The display subsystem contains a removable door assembly which provides for back-lighting for direct viewing. When the door assembly is removed, the active matrix LCD is semi-transparent and can be placed over the imaging screen of the overhead projector such that the LCD color image can be thus projected. The lamps that provide the back-lighting remain within the display subsystem when the door is removed and a unique optical coupling is provided between the lamps and a light pipe within the door. The display subsystem contains a sensor detecting door presence and simultaneously shuts off the lamps and reverses the display image upon door removal for overhead projection capability.
REFERENCES:
patent: 4882599 (1989-11-01), Grunwald
patent: 4904079 (1990-02-01), Yoshimura et al.
patent: 4944578 (1990-07-01), Denison
patent: 4946274 (1990-08-01), Honda
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patent: 5076543 (1991-12-01), Mandai
patent: 5101197 (1992-03-01), Hix et al.
patent: 5302985 (1994-04-01), Kennedy et al.
patent: 5353075 (1994-10-01), Conner et al.
Evanicky Daniel E.
Keely Leroy B.
Siefert Steven
Dowling William C.
Silicon Graphics Inc.
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