Paul A Steiner

US Patent:

20020149852, Oct 17, 2002

Filed:

Apr 12, 2002

Appl. No.:

10/120792

Inventors:

Michael Dubinovsky - Pembroke Pines FL, US
Douglas Kirkpatrick - Great Falls VA, US
Bruce Shanks - Sioux Falls SD, US
Paul Steiner - Olney MD, US
Brian Turner - Germantown MD, US

International Classification:

G02B027/10
G02B027/14

US Classification:

359/618000, 359/629000

Abstract:

Various projection systems are described with improved performance. A projection system utilizes negative distortion together with a pre-compensated light source to reduce spill. A projection system utilizes a single angle transforming optical element positioned between an imager and a light source to increase throughput. A two panel projection system utilizes both polarities to increase light output. A projection system utilizes a three segment color wheel with a small white bias in each segment to reduce color breakup. A projection system utilizes a digital micro-mirror device and recycles OFF state light. A projection system utilizes two color wheels to improve recycling of light. A two panel projection system utilizes a color wheel which transmits a deficient color band and time sequences the other bands while reflecting the unused light back to the light source for recycling.