Reduced field angle projection display system
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United States of America Patent
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N/A
Issued Date -
Jul 19, 2007
app pub date -
Jan 13, 2006
filing date -
Jan 13, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A rear projection display system (RPDS) and associated optical system are described with a reduced field angle. The RPDS includes a screen and a housing. The optical system includes a light engine, a first mirror, a second mirror and a Fresnel lens arranged to achieve a thin housing. The light engine is generally disposed in an upper region of the housing, and projects light onto the first mirror, which can be located at a bottom portion of the housing. The first mirror reflects the projected light onto the second mirror, which in turns reflects the light towards the Fresnel lens, which transfers the light onto the screen. A total internal reflection Fresnel lens is used to reduce cost and complexity without sacrificing image quality and housing thinness. An image processing device can also be used to compensate for geometric and optical distortions in the final image displayed on the screen.
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