Patent ID: 7742138

Claim:
A liquid crystal display comprising: a pair of substrates; a liquid crystal layer placed between a pair of the electrodes; electrodes provided on at least one of the substrates to apply an electrical field to the liquid crystal layer; active elements each connected to each of the electrodes; and a photo-reactive alignment layer placed between the liquid crystal layer and at least one of the substrates, wherein the electrodes include a common electrode and a source electrode, the common electrode or the source electrode is formed on an insulation film, the photo-reactive alignment layer is formed on the insulation layer and the common electrode or the source electrode, a polarized light used for alignment treatment of the photo-reactive alignment layer has a light wavelength of 200 to 400 nm, the photo-reactive alignment layer contains a polyamic acid or polyimide composed of cyclobutanetetracarboxylic dianhydride or a derivative thereof, and diamine compound; the cyclobutanetetracarboxylic dianhydride or derivative thereof contains at least one species selected from the group consisting of those represented by the general formulae [Compound 1] to [Compound 3]: (wherein, R 1 to R 4 are independently hydrogen, fluorine, chlorine or bromine atom, phenyl group, an alkyl group or alkoxy group of 1 to 6 carbon atoms, vinyl group [—(CH 2 ) m —CH═CH 2 , m is 0, 1 or 2] or acetylene group [—(CH 2 ) m —C≡CH, m is 0, 1 or 2]); the diamine compound contains at least one species selected from the group consisting of those represented by the general formulae [Compound 5] to [Compound 18] and [Compound 21] to [Compound 22]: (wherein, R 1 to R 8 for Compounds 5 to 18 are independently hydrogen, fluorine or chlorine atom, an alkyl group or alkoxy group of 1 to 6 carbon atoms, vinyl group [—(CH 2 ) m —CH═CH 2 , m is 0, 1 or 2] or acetylene group [—(CH 2 ) m —CH≡CH, m is 0, 1 or 2]; X for Compounds 10 to 12 is —CH 2 —, —NH—, —CO—, —O— or —S— as a coupling group; and R 1 for Compounds 21 and 22 are independently an alkyl group of 1 to 6 carbon atoms).