Light recycling in a micromirror-based projection display system
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United States of America Patent
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Jun 14, 2011
Grant Date -
Jan 8, 2009
app pub date -
Aug 30, 2007
filing date -
Jul 2, 2007
priority date (Note) -
In Force
status (Latency Note)
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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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