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US 6,633,354 B2Granted
Spectrum-controllable reflective polarizers having electrically-switchable modes of operation
AssigneeReveo, Inc.
InventorsLe Li, Bunsen Fan, Yingqiu Jiang, Sadeg M. Faris, Jian-Feng Li
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Abstract
A light controlling film is disclosed, comprising a polymerized polymer network varying spatially in a direction normal to the film surface, where the polymerized polymer network is a crosslinked high molecular weight polymeric material mixed with a low molecular weight nematic material exhibiting cholesteric liquid crystal (CLC) order, wherein an electric field impressed in the film controls the reflection bandwidth of circularly polarized light.
Claims7
A method of making a light controlling film, the film having a first surface and a second surface, comprising:
- applying a mixture of high molecular weight polymeric material and low molecular weight polymeric material on a surface which produces a CLC order in the mixture;
- and
- crosslinking the high molecular weight polymeric material, the crosslinking including irradiation of the film by ultraviolet radiation having an intensity of at least about 0.1 watts per squared centimeter;
- wherein light having a first polarization and a first bandwidth incident on the first surface is substantially reflected from the film, and
- wherein light having a second polarization and the first bandwidth incident on the first surface is not substantially reflected from the film, and wherein an electric field impressed in the film substantially increases the first bandwidth of reflection of light having the first polarization.
2 more elements
Dependencies are inferred from the claim text.