Light recycling in a micromirror-based projection display...

Optics: image projectors – Reflector – Plural

Reexamination Certificate

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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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