Contrast and brightness enhancing apertures for illumination...

Optics: image projectors – Light shield – mask – hood – or diaphragm

Reexamination Certificate

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Details

C353S020000, C353S031000, C348S771000

Reexamination Certificate

active

07029130

ABSTRACT:
The present invention is particularly useful for projection systems in which portions of an unwanted light beam overlap with the image beam. Such an overlap reduces the image contrast. Under the present invention, an aperture is used to restrict the extent of the unwanted beam while an integrator changes the shape of the light beam illuminating the image display device. The integrator changes the illumination beam so as concentrate the light in those areas of the illumination beam that are transmitted through the aperture. When the aperture and the integrator are used together in the projection system, both the image brightness and the image contrast are increased.

REFERENCES:
patent: 5442414 (1995-08-01), Janssen et al.
patent: 5552922 (1996-09-01), Magarill
patent: 5625738 (1997-04-01), Magarill
patent: 6591022 (2003-07-01), Dewald
patent: 6607280 (2003-08-01), Koyama et al.
patent: 6719429 (2004-04-01), Peterson
patent: 6724546 (2004-04-01), Nishimae et al.
patent: 6773120 (2004-08-01), Colpaert
patent: 2001/0026450 (2001-10-01), Li
patent: 2003/0147052 (2003-08-01), Penn et al.
patent: 2003/0202259 (2003-10-01), Nishimae et al.
patent: 2004/0080723 (2004-04-01), Inamoto
patent: 2004/0119950 (2004-06-01), Penn et al.
patent: WO 03/063509 (2003-07-01), None
“DLP™ Projector System Optics Contrast-Enhancement Techniques” Application report DLPA006A, published by Texas Instruments, Jun. 2001.

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