Patent ID: 6917399
Filing Date: 2005-07-12
Classification: G02B

Abstract:
1. A method of making an optical body, the method comprising steps of: forming a first cholesteric liquid crystal polymer layer exhibiting a cholesteric liquid crystal abase on a substrate using a first coating composition; coating a second coating composition on the first cholesteric liquid crystal polymer layer, the second coating composition comprising a solvent and at least one chiral monomer material selected from reactive chiral monomers, the second coating composition being different than the first coating composition; diffusing a portion of the chiral monomer material from the second coating composition into a portion of the first cholesteric liquid crystal polymer layer exhibiting a cholesteric liquid crystal phase adjacent the second coating composition; and curing the chiral monomer material to generate at least one cholesteric liquid crystal layer from the first cholesteric liquid crystal polymer layer and the second coating composition, the at least one cholesteric liquid crystal layer having a non-uniform pitch and comprising a first cholesteric liquid crystal region consisting essentially of material from the first coating composition, a second cholesteric liquid crystal region consisting essentially of material from the second coating composition, and a third cholesteric liquid crystal region disposed between the first and second cholesteric liquid crystal regions and comprising material from the first coating composition and material from the second coating composition.