Light collectors for projection systems

Details Light collectors for projection systems Light collectors for projection systems

2011-07-19

2011-07-19

Shafer, Ricky (Department: 2872)

Optical: systems and elements

Polarization without modulation

Polarization by birefringence

C359S489090, C359S489150, C359S489180, C359S491010, C362S019000, C362S551000, C362S555000, C362S583000, C353S020000, C385S036000

Reexamination Certificate

active

07982954

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 use of a polarizing beamsplitter (PBS) and a reflecting element. Further, the light collection system may efficiently homogenize the light using an output lightpipe in a lightpath from the output of the PBS and the reflecting element. 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.

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