Patent ID: 8828650
Filing Date: 2014-09-09
Classification: C08F,G02B,G02F,G03F

Abstract:
1. A method for making a retarder, comprising: (a) forming a photocurable layer on a substrate, the photocurable layer including a photocurable compound having at least one photo curable prepolymer that has a plurality of reactive functional groups and a functional group equivalent weight ranging from 70 to 700 g/mol; (b) covering partially the photocurable layer using a patterned mask; (c) exposing the photo curable layer through the patterned mask using a first light source so that the photocurable layer is cured at first regions which are exposed; (d) removing the patterned mask; (e) exposing the photocurable layer using a second light source to cure second regions of the photocurable layer which have not been cured so as to form a microstructure on the substrate; (f) forming an alignment layer on the microstructure; (g) forming a liquid crystal layer on the alignment layer so that the liquid crystal layer is aligned by the alignment layer; and (h) curing the liquid crystal layer so that the liquid crystal layer includes at least one thick layer region and at least one thin layer region; wherein after step (h), the cured liquid crystal layer has two refractive indexes, and a refractive index difference between the two refractive indexes ranges from 0.1 to 0.3.