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This invention relates to optical devices in which doped PCLC flakes can be used in a host fluid in either passive or active devices with optical properties.
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Applications: This invention relates to optical devices in which doped PCLC flakes can be used in a host fluid in either passive or active devices with optical properties that can be manipulated and controlled by an electric field for use in information displays, shutters, switchable filters, polarizers, wavelength selective mirrors, etc. Advantages: This invention uses micron sized PCLC flakes doped with a variety of materials such as titanium dioxide, barium titanate, carbon black, metal particles, etc. suspended in a host fluid system to manipulate the angular motion of the flakes in response to applied AC fields to provide optical effects that can be used in a variety of devices. The ability to use such dopants in the flakes allows tailoring the properties of the device for the desired application which may require increased conductivity, dielectric property or color. Also, such doped flakes still create angle-dependent optical properties through optical interference effects of the PCLC components of the flake. These device have inherent advantages in characteristics, fabrication and operation over the more recent invention which use electrophoretic effect to move bichromal sphere or submicron particles to generate the desired optical effect.