Optical film and liquid crystal display device

Abstract

PROBLEM TO BE SOLVED: To provide an optical film which facilitates the immobilization of liquid crystal orientation, can realize the wavelength dispersion of small birefringence, can be easily manufactured at a low cost in industrial view and can also be exactly regulated in optical characteristics, such as wavelength dispersion of the birefringence, is immobilized with the desired orientation state and can be made uniform and larger in area. SOLUTION: The optical film is composed of polyester including a structural unit derived from 1,1'-bicyclohexyl-4,4'-dicarboxylic acid and a structural unit derived from an aromatic diol-based compound of an ortho body and is obtained by cooling the orientation state formed during the thermal orientation of the polyester to its glass transition temperature or below so as to immobilize the orientation state.

Description

technical field

[0001] The invention relates to an optical film which is easy to fix liquid crystal orientation, has small wavelength dispersion of birefringence, and is suitable for application in optical elements such as retardation film, circular polarizing plate, elliptical polarizing plate and liquid crystal display device using it. Background technique

[0002] Polymer liquid crystals are being actively researched and developed in the field of heat-resistant high-functional resins utilizing their high heat resistance, moldability, etc., and in the field of functional materials utilizing liquid crystal alignment. In the field of heat-resistant high-functional resins, it has been developed and commercialized in various fields such as electronic and electric parts, automobile parts, OA and AV equipment parts, and sealing materials. On the other hand, in the field of functional materials, active development and research are being carried out for applications such as optica...

Images