Patent ID: 8134660
Filing Date: 2012-03-13
Classification: B42D,G02B,G03B

Abstract:
1. An optical diffusion device, comprising: a base material; and a cholesteric liquid crystal polymer layer provided on the base material and composed of a plurality of diffusion regions arranged on a plane; wherein the cholesteric liquid crystal polymer layer contains a large number of spiral liquid crystal domains; and wherein a diffusion angle of a first diffusion region of the cholesteric liquid crystal polymer layer is different from a diffusion angle of a second diffusion region, which selectively reflects light of the same particular wavelength as that of the first diffusion region, because a direction and a degree of scattering of an axis of spiral liquid crystal domains of the first diffusion region of the cholesteric liquid crystal polymer layer is different from a direction and a degree of scattering of an axis of spiral liquid crystal domains of the second diffusion region of the cholesteric liquid crystal polymer layer, and the second diffusion region is provided in a pattern so that the second diffusion region appears as standing out from the first diffusion region.