Path shifting optical device having polarization correcting...

Details Path shifting optical device having polarization correcting... Path shifting optical device having polarization correcting...

2005-12-06

2005-12-06

Chowdhury, Tarifur R. (Department: 2871)

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

C349S117000, C349S193000, C359S490020, C345S056000

Reexamination Certificate

active

06972809

ABSTRACT:
An optical device includes an optical path shifter that has at least one optical path shifting section. The optical path shifting section includes: a polarization modulator for changing the polarization state of an incoming light ray; and a birefringent element for shifting the optical path of an outgoing light ray of the polarization modulator based on the polarization state of the outgoing light ray. The optical device further includes a polarization corrector, which selectively changes the polarization state of an outgoing light ray of the optical path shifter, thereby keeping the polarization state of an outgoing light ray of the polarization corrector substantially unchanged no matter where the optical path has been shifted.

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