Polarization conversion systems for stereoscopic projection

Details Polarization conversion systems for stereoscopic projection Polarization conversion systems for stereoscopic projection

2011-03-15

2011-03-15

Ko, Tony (Department: 2878)

Optics: image projectors

Polarizer or interference filter

C353S010000, C353S031000

Reexamination Certificate

active

07905602

ABSTRACT:
A polarization conversion system (PCS) is located in the output light path of a projector. The PCS may include a polarizing beam splitter, a polarization rotating element, a reflecting element, and a polarization switch. Typically, a projector outputs randomly-polarized light. This light is input to the PCS, in which the PCS separates p-polarized light and s-polarized light at the polarizing beam splitter. P-polarized light is directed toward the polarization switch on a first path. The s-polarized light is passed on a second path through the polarization rotating element (e.g., a half-wave plate), thereby transforming it to p-polarized light. A reflecting element directs the transformed polarized light (now p-polarized) along the second path toward the polarization switch. The first and second light paths are ultimately directed toward a projection screen to collectively form a brighter screen image in cinematic applications utilizing polarized light for three-dimensional viewing.

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