Patent ID: 6671031
Filing Date: 2003-12-30
Classification: G02B

Abstract:
A method for manufacturing a polarization diffraction film, comprising the steps of forming a film with a liquid crystal material containing a liquid crystalline polymer and a crosslinkable substance, fixing a cholesteric alignment formed with said liquid crystal material, crosslinking said liquid crystal material to form a liquid crystal film, and providing a region on at least a part of said liquid crystal film, wherein the region exhibits a diffraction capability and is a surface of said liquid crystal, and wherein said liquid crystal film is formed by dissolving said liquid crystal material in a solvent to form a solution; applying the solution onto a supporting film or substrate to form a coat layer, subsequently drying the coat layer to vaporize the solvent and form a dried film, subjecting the dried film to a heat treatment to form said cholesteric alignment, and conducting a cross-linking reaction of said liquid crystal material after said cholesteric alignment formation.