Liquid crystal cells – elements and systems – Liquid crystal system – Variable or rotatable retarder used with other retarders to...
Patent
1995-05-23
1998-05-12
Sikes, William L.
Liquid crystal cells, elements and systems
Liquid crystal system
Variable or rotatable retarder used with other retarders to...
349 97, 349119, 349 78, 359499, 359498, G02F 11335
Patent
active
057513848
ABSTRACT:
This invention provides a complementary color polarizer using a single polarizing film followed by a stack of two or more retarders. In a preferred embodiment, the color polarizers of this invention produce orthogonally polarized complementary primary colors (red/cyan, green/magenta, or blue/yellow). This invention further provides color filters which utilize the color polarizers of this invention in combination with a polarization separator to separate the orthogonally polarized colors. The polarization separator can be passive, such as a polarizing beam splitter, or active, such as a switchable polarizer. The switchable polarizer can employ a nematic or a smectic liquid crystal cell. Two color filters of this invention can be cascaded to provide a three color (RGB) filter with an off-state. In combination with a monochrome display or camera, the color filters of this invention provide color displays or cameras.
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Packer Kenneth
Sikes William L.
The Board of Regents of the University of Colorado
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