Importance

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Abstract

An electronically adjustable color filter device is provided for filtering light at a wavelength corresponding to a selected color of the Electromagnetic Spectrum. Unpolarized light, at the specified wavelength, is polarized using a dichroic, cholesteric polarizer. An adjustable wave plate is optically aligned with the polarizer to convert the polarized light into two separate elements, each element having a different polarization state. A color filter, which may be a dichroic cholesteric film, filters one element of the polarized light while permitting the second element to pass. A plurality of the color filter devices may be positioned sequentially to filter various colors of light, thereby producing light having a desired combination of colors. Polarized light may be filtered, whereby a polarizer is not required. An electronically adjustable color filter system may include multiple filter devices, as well as a color detector and a controller for adjusting the wave plates.

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First Claim