Optics: image projectors – Light shield – mask – hood – or diaphragm
Reexamination Certificate
2006-04-18
2006-04-18
Perkey, William B. (Department: 2851)
Optics: image projectors
Light shield, mask, hood, or diaphragm
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.
Cannon Bruce L.
Engstrom Frederic R.
Kingsley Gary B.
Oehler Peter R.
3M Innovative Properties Company
Jonas George W.
Perkey William B.
Sever Andrew
LandOfFree
Contrast and brightness enhancing apertures for illumination... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Contrast and brightness enhancing apertures for illumination..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contrast and brightness enhancing apertures for illumination... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3616866