Optics: image projectors – Reflector – Plural
Reexamination Certificate
2011-06-14
2011-06-14
Epps, Georgia Y (Department: 2878)
Optics: image projectors
Reflector
Plural
C353S030000, C353S031000, C353S077000, C353S079000, C353S098000, C353S084000, C353S119000, C353S122000, C359S726000, C359S872000, C359S385000, C359S237000, C359S223100, C359S225100, C359S224100, C348S742000, C348S743000, C348S744000, C348S771000, C372S009000, C372S020000, C372S023000, C372S029011, C362S551000, C362S553000, C362S555000, C362S561000, C345S690000, C345S691000
Reexamination Certificate
active
07959305
ABSTRACT:
A digital micromirror projection display system is disclosed in which “off” pixel light is recaptured and recycled. In the disclosed system, a digital micromirror device directs incident light for “on” pixels in the image to be displayed through projection lenses to a projection screen. The digital micromirror device directs incident light for “off” pixels back toward the light source for recapture by a light integrator. Both the incident and projected light can pass through a rear group of projection lenses, with the first projection lens being disposed near the digital micromirror device. A mirror directs the incident light toward the digital micromirror device, and the “off” pixel light from the digital micromirror device toward the light integrator. As a result, “off” pixel light can be recycled without degrading image contrast, in a manner that can place fast projection lenses close to the digital micromirror device to save cost.
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Brady III Wade James
Brill Charles A.
Chowdhury Sultan
Epps Georgia Y
Telecky , Jr. Frederick J.
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