Retarder stacks for polarizing a first color spectrum along a first axis and a second color spectrum along a second axis
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United States of America Patent
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Sep 14, 1999
Issued Date -
N/A
app pub date -
May 8, 1997
filing date -
May 23, 1995
priority date (Note) -
In Force
status (Latency Note)
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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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