Unitary prepolarizing prism assembly for a four color liquid cry

Details Unitary prepolarizing prism assembly for a four color liquid cry Unitary prepolarizing prism assembly for a four color liquid cry

1988-09-23

1989-06-27

Miller, Stanley D.

Optics: image projectors

Plural projection paths with single light source

350331R, 350174, 350401, 353 31, G02F 113, G02B 2728, G02B 2100

Patent

active

048423742

ABSTRACT:
A simple, less costly prepolarizing prism assembly for a four color liquid crystal light valve image projector is disclosed. The invention is a unitary assembly which provides a combined beam of light having a first component of a first color and first polarization state and a second component of a second color and a second polarization state. The invention includes a first color filter for reflecting, from an input beam of unpolarized white light, light of a third color and transmitting light of the first and second colors in a combined beam along a first optical path. A first prepolarizer is mounted on the first filter for extracting, from the combined beam, light of a second color and the first polarization state. A second prepolarizer is mounted on the first prepolarizer for extracting, from the combined beam, light of a first color and the second polarization state.

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