US 6,982,830 B2
Polarization recovery system for projection displays
Kenneth K. Li, Arcadia, Calif. (US)
Assigned to Wavien, Inc., Santa Clarita, Calif. (US)
Filed on Jan. 21, 2003, as Appl. No. 10/347,522.
Application 10/347522 is a continuation of application No. 09/814970, filed on Mar. 23, 2001, granted, now 6,587,269.
Claims priority of provisional application 60/227312, filed on Aug. 24, 2000.
Claims priority of provisional application 60/246583, filed on Nov. 08, 2000.
Prior Publication US 2003/0147137 A1, Aug. 07, 2003
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 27/28 (2006.01); G02B 5/30 (2006.01)
U.S. Cl. 359—496 21 Claims
OG exemplary drawing
 
1. A polarization recovery system comprising:
a light source that emits light energy;
a polarizing beam splitter positioned to receive a substantial portion of the light energy from the light source, the polarizing beam splitter transmitting light energy of a first polarization type and reflecting light energy of a second polarization type;
a polarization shifter positioned to receive and modify the polarization of a substantial portion of either the transmitted or the reflected light energy; and
an output waveguide for integrating a substantial portion of both the transmitted light energy and the reflected light energy.