Title:
AN ILLUMINATION ENGINE FOR A PROJECTION DISPLAY USING A TAPERED LIGHT PIPE
Document Type and Number:
WIPO Patent Application WO2002063390
Kind Code:
A3
Abstract:
An illumination engine for a projection display using a tapered light pipe(718) including a reflector having first and second focal points. A source of electro-magnetic radiation disposed proximate to the first focal point of the reflector emits rays of radiation that reflect from the reflector toward the second focal point. A tapered light pipe(718) collects and transmits substantially all of the radiation converged at the second focal point(722), adjusting the numerical aperture of the radiation, but curving the surface formed by the images of the radiation. A straight light pipe(724) or a lens collects and transmits substantially all of the radiation transmitted by the tapered light pipe , flattening the surface formed by the images of the radiation. A condenser lens(707) collects and transmits all of the radiation transmitted by the contoured delay element to a polarizing beam splitter(740) and a projection system (738).
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Inventors:
LI KENNETH K (US)
Application Number:
PCT/US2002/002869
Publication Date:
November 28, 2002
Filing Date:
February 04, 2002
Export Citation:
Assignee:
COGENT LIGHT TECH (US)
LI KENNETH K (US)
LI KENNETH K (US)
International Classes:
F21S2/00; G02B19/00; F21V8/00; F21V13/00; G02B3/00; G02B27/00; G02B27/09; G02B27/28; G02F1/13357; G03B21/00; G03B21/14; F21Y101/00; (IPC1-7): G03B21/28
Foreign References:
| US5884991A | 1999-03-23 | |||
| US5625738A | 1997-04-29 | |||
| US5829858A | 1998-11-03 |
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