Method and apparatus for multi color display
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United States of America Patent
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Sep 13, 1988
Grant Date -
N/A
app pub date -
Jun 10, 1986
filing date -
Jun 10, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for producing a color display from a substantially monochromatic source utilizes a liquid crystal cell combination together with a plechroic filter to differentially polarize the light components comprising the light emitted from the source. The liquid crystal cells are connected in push-pull fashion to individually retard light by one fourth of a wave as a function of the control signal applied to them. A fourth wave plate followed by a linear polarizer completes the optical combination. A signal at a first level applied to the cells causes transmission of one component color and blocks the other. A signal at a second level blocks the one component color and transmits the other. An intermediate level signal transmits both colors, resulting in a third, combination color.
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