Color filter switchable among three state via a variable retarde

Details Color filter switchable among three state via a variable retarde Color filter switchable among three state via a variable retarde

1985-03-08

1987-06-23

Corbin, John K.

350347R, 350347E, G02F 1135

Patent

active

046748415

ABSTRACT:
A switchable color filter (10) develops with the use of a single electro-optic switching device positioned between first and second polarizing filter means (14 and 16) an output of three desaturated colors that define an area (54) in color space. The switching device comprises a variable optical retarding means (12) that includes a variable optical retarder (18) and a quarter-wave plate (20). The first and second filter means pass light rays of three primary colors. The variable optical retarding means selectively provides zero, quarter-wave, and half-wave retardation of light rays passing through it to develop the three output colors. The quarter-wave plate is positioned such that it forms a circular analyzer for one of the three primary colors when the variable optical retarder provides quarter-wave retardation. Each of the three output colors is a mixture of at least two of the primary colors.

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