Patent ID: 8592009
Filing Date: 2013-11-26
Classification: B32B,C08L,C09K,G02F

Abstract:
1. A liquid crystal display device comprising: a pair of substrates, at least one of which is transparent; a liquid crystal layer disposed between the pair of substrates; a group of electrodes formed on at least one of the pair of substrates to apply an electric field to the liquid crystal layer; plural active elements connected to the group of electrodes; and a liquid-crystal orientation control film disposed on at least one of the pair of substrates; wherein said orientation control film is made of a photosensitive polyimide, a polyamide acid ester and a polyamide acid, and is given orientation control ability by being irradiated with substantially linearly polarized light; wherein the pretilt angles of the liquid crystal molecules of the liquid crystal layer are not larger than 1 degree; wherein the polyamide acid ester contains a polyamide acid ester that contains a polymer unit given by the following formula (116) and/or (117), or a polyamide acid ester that contains a polymer unit given by the following formula (116) and/or (117) and a polymer unit given by the following formula (116) and/or (117) wherein the cyclobutane section is replaced with a section given by at least one of the following general formulae (51) through (55): wherein each R1 is individually an alkyl group containing 1 to 8 carbon atoms, each R2 is individually a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a phenyl group, an alkyl group containing 1 to 6 carbon atoms, an alkoxy group containing 1 to 6 carbon atoms, a vinyl group (—(CH2)m-CH═CH2, m=0, 1, 2), or an alkynyl group (—(CH2)m-C≡CH, m=0, 1, 2), and Ar is an aromatic compound; wherein the photosensitive polyimide comprises polyimide formed by imidating a polyamide acid ester that contains a polymer unit given by the above formula (116) and/or (117), or a polyamide acid ester that contains a polymer unit given by the above formula (116) and/or (117) and a polymer unit given by the above formula (116) and/or (117) wherein the cyclobutane section is replaced with a section given by at least one of the following general formulae (51) through (55); wherein the polyamide acid contains a polyamide acid that contains a polymer unit given by the following formula (121) and/or (122), or a polyamide acid that contains a polymer unit given by the following formula (121) and/or (122) and a polymer unit given by the following formula (121) and/or (122) wherein the cyclobutane section is replaced with a section given by at least one of the following general formulae (51) through (55): wherein each R2 is individually a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a phenyl group, an alkyl group containing 1 to 6 carbon atoms, an alkoxy group containing 1 to 6 carbon atoms, a vinyl group (—(CH2)m-CH═CH2, m=0, 1, 2), or an alkynyl group (—(CH2)m-C≡CH, m=0, 1, 2), and Ar is an aromatic compound, wherein each hydrogen molecule of the aromatic rings individually may instead be a fluorine atom, a chlorine atom, a bromine atom, a phenyl group, an alkyl group containing 1 to 8 carbon atoms, an alkoxy group, a vinyl group, or an alkynyl group; and Z is any of the following functional groups, (—CH2-, —CO2-, —NH—, —O—, —S—, —SO—, —SO2-), and wherein each hydrogen atom may instead be a fluorine atom, a chlorine atom, a bromine atom, a phenyl group, an alkyl group containing 1 to 8 carbon atoms, an alkoxy group, a vinyl group or an alkynyl group.