High contrast, compact, full-color polarizer and color beam spli

Details High contrast, compact, full-color polarizer and color beam spli High contrast, compact, full-color polarizer and color beam spli

1997-11-04

1999-11-16

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

G02B 2714

Patent

active

059868147

ABSTRACT:
A high contrast polarizer and color beam splitter for use in a full color light valve projector includes a light source for providing input light on a first optical axis and first, second and third light valves for modulating light of first, second and third colors. The polarizer and color beam splitter includes a color and angle sensitive interface, located on the first optical axis, for reflecting at least part of the input light. A polarizer, located on a second optical axis, receives the input light reflected by the color and angle sensitive interface and reflects light of a first polarization along the second optical axis. A first color separator, located on the second optical axis at a first angle with respect to a plane orthogonal to the second optical axis, reflects light of the first color onto the color and angle sensitive interface. The color and angle sensitive interface transmits the light of the first polarization and the first color, received from the first color separating means, onto the first light valve. The polarizer and color beam splitter minimizes the angle of the first color separator to decrease the phase change and increase contrast while maintaining a compact size.

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