Image projection system

Details Image projection system Image projection system

2005-04-19

2005-04-19

Lee, Michael H. (Department: 2614)

Television

Video display

Projection device

C348S742000, C348S771000, C359S312000

Reexamination Certificate

active

06882374

ABSTRACT:
A DMD (4) as a image display device time divisionally displays channel images formed by separating an image into RGB channels. A white light emitted from a xenon lamp (1) is separated, by an acousto-optical element (3), into spectal components. Those spectal components are projected onto the DMD (4). A refractive index of the acousto-optical element (3) varies with a frequency of an ultrasonic wave applied thereto. Therefore, a color of the spectral component applied to the DMD (4) may be changed by varying the refractive index of the acousto-optical element. RGB monochromatic lights may be irradiated on the DMD (4) by setting the frequencies FR, FG, FBof the ultrasonic wave at appropriate values.

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patent: 5410371 (1995-04-01), Lambert
patent: 5687020 (1997-11-01), Park
patent: 6483556 (2002-11-01), Karakawa et al.

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