Optical bodies containing cholesteric liquid crystal material and methods of manufacture
First Claim
1. An optical body, comprising:
- a substrate;
a first cholesteric liquid crystal region consisting essentially of a layer of a first cholesteric liquid crystal material disposed on the substrate;
a second cholesteric liquid crystal region comprising cross-linked first chiral monomers; and
a third cholesteric liquid crystal region disposed between the first and second regions and comprising the first cholesteric liquid crystal material and the first chiral monomers, the chiral monomers in the third region being crosslinked to the chiral monomers in the second region,wherein the third cholesteric liquid crystal region has a non-uniform pitch along a thickness direction of the cholesteric liquid crystal region.
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Accused Products
Abstract
An optical body includes a substrate and a cholesteric liquid crystal layer disposed on the substrate. The cholesteric liquid crystal layer has a non-uniform pitch along a thickness direction of the layer and comprises a crosslinked polymer material that substantially fixes the cholesteric liquid crystal layer. The crosslinking hinders diffusion of cholesteric liquid crystal material within the cholesteric liquid crystal layer. In other methods of making an optical body, a reservoir of chiral material is provided during the process over a first cholesteric liquid crystal layer to diffuse into the layer and provide a non-uniform pitch. Alternatively, two coating compositions can be disposed on a substrate where the material of the first coating composition is not substantially soluble in the second coating composition.
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Citations
10 Claims
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1. An optical body, comprising:
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a substrate; a first cholesteric liquid crystal region consisting essentially of a layer of a first cholesteric liquid crystal material disposed on the substrate; a second cholesteric liquid crystal region comprising cross-linked first chiral monomers; and a third cholesteric liquid crystal region disposed between the first and second regions and comprising the first cholesteric liquid crystal material and the first chiral monomers, the chiral monomers in the third region being crosslinked to the chiral monomers in the second region, wherein the third cholesteric liquid crystal region has a non-uniform pitch along a thickness direction of the cholesteric liquid crystal region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An optical display, comprising:
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a display medium; a reflective polarizer comprising a substrate; a first cholesteric liquid crystal region consisting essentially of a layer of first cholesteric liquid crystal material disposed on the substrate; a second cholesteric liquid crystal region comprising cross-linked first chiral monomers; and a third cholesteric liquid crystal region disposed between the first and second regions and comprising the first cholesteric liquid crystal material and the first chiral monomers, the chiral monomers in the third region being crosslinked to the chiral monomers in the second region, wherein the third cholesteric liquid crystal region has a non-uniform pitch along a thickness direction of the cholesteric liquid crystal region.
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Specification