Light collectors for projection systems

Details Light collectors for projection systems Light collectors for projection systems

2007-07-18

2009-06-02

Shafer, Ricky D (Department: 2872)

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

C359S490020, C359S490020, C359S506000, C362S019000, C362S551000, C362S583000, C353S020000, C385S036000

Reexamination Certificate

active

07542206

ABSTRACT:
Disclosed herein are light collectors for use in projection applications. The light collectors gather light from surface emitting sources (e.g., LEDs) of differing color (or same color in some embodiments) using input lightpipes. A light collection system splits the light into orthogonal linear polarization states and efficiently propagates the light by using polarizing beamsplitters (PBSs) and a reflecting element to recycle light at a port of the PBS. Further, the light collection system may efficiently homogenize the light using an output lightpipe in a lightpath from the outputs of the PBSs. In addition, the light collection system may present a single, linear polarization at the output through the use of a half-wave switch (LC cell) in some embodiments or ColorSelect filter in other embodiments. The light collection system may be integrated into a single, monolithic glass, plastic or combination glass/plastic assembly.

REFERENCES:
patent: 5223975 (1993-06-01), Naganuma et al.
patent: 5382790 (1995-01-01), Robillard et al.
patent: 5513023 (1996-04-01), Fritz et al.
patent: 6132047 (2000-10-01), Itoh
patent: 6384972 (2002-05-01), Chuang
patent: 6726329 (2004-04-01), Li et al.
patent: 6937377 (2005-08-01), Brown et al.
patent: 7325957 (2008-02-01), Morejon et al.
patent: 2005/0200812 (2005-09-01), Sakata et al.
patent: 2005/0259224 (2005-11-01), Lee et al.
patent: 2006/0007538 (2006-01-01), Robinson
International search report and written opinion of international searching authority in co-pending PCT application No. PCT/US07/73809 mailed Sep. 24, 2008.

Affiliated with

Also associated with

Rating

Light collectors for projection systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Light collectors for projection systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light collectors for projection systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4144966