OPTICAL ELEMENT, LIQUID CRYSTAL DISPLAY DEVICE MEMBER USING OPTICAL ELEMENT, LIQUID CRYSTAL DISPLAY DEVICE USING LIQUID CRYSTAL DISPLAY DEVICE MEMBER, MANUFACTURING METHOD OF OPTICAL ELEMENT AND METHOD OF EVALUATING BIREFRINGENCE FUNCTIONAL LAYER

摘要

PROBLEM TO BE SOLVED: To provide an optical element which includes a birefringence functional layer composed of a polymerizable liquid crystal material, does not disturb alignment and performance of the birefringence functional layer in a succeeding additional post process after forming the birefringence functional layer on a substrate directly and indirectly and, as the result, can exhibit a high-quality retardation control function, to provide a liquid crystal display device provided with the optical element, to provide a method of evaluating the birefringence functional layer not adversely affected by the post process, and to provide a manufacturing method of the optical element.;SOLUTION: The optical element comprises at least: a light-transmitting substrate; and the birefringence functional layer made of a polymerizable liquid crystal material, wherein the birefringence functional layer is constituted by aligning and fixing a polymerizable liquid crystal monomer having a polymerizable group at least at one terminal directly or indirectly onto the substrate and a degree of reduction of residual double bonds in the birefringence functional layer before and after heat treatment at 250C for 1 hr is less than 0.25.;COPYRIGHT: (C)2008,JPO&INPIT