Color filter
AssigneeKabushiki Kaisha Daini Seikosha
InventorYoshio Katagiri
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Abstract
A color filter using liquid crystal compounds is disclosed. Mixtures of nematic and cholesteric liquid crystal compounds are sealed between a pair of transparent plates to construct a liquid crystal cell, and a pair of polarizer plates is disposed at both sides of the cell. The color of the light passing through the filter device can be controlled and changed by changing the angle of the polarized plane defined by each polarizer plate and by changing the ambient temperature surrounding the device or the liquid crystal mixtures within the cell.
Claims6
A color controllable filter device comprising a pair of parallel disposed transparent plates and spacer means defining a liquid crystal cell;
- a mixture of nematic and cholesteric liquid crystal compounds contained in said cell, said cholesteric compounds being present in an amount of from one to twenty weight percent of said mixture, said nematic liquid compounds forming the balance, said crystal mixture in said cell being free from specifically applied stress;
- a pair of variable-angle polarizers disposed on opposite sides of said liquid crystal cell, the wavelengths of transmissivity and reflectance of light through said device being variably controlled, based upon the polarizing angle between said variable-angle polarizer pair.
Dependencies are inferred from the claim text.