Patent ID: 7790248

Claim:
An active matrix type liquid crystal display apparatus having a plurality of thin film transistors, comprising: a pair of substrates, at least one of which is transparent; a pair of electrodes for applying an electric field nearly parallel to surfaces of the pair of substrates, comprising a pixel electrode and a common electrode provided on one substrate of the pair of substrates; a liquid crystal layer arranged between the pair of substrates; an alignment layer arranged between the liquid crystal layer and one of the pair of substrates; and a pair of polarizing plates arranged on the opposite sides of the pair of substrates to the liquid crystal layer; wherein the alignment layer is photoreactive, provided with a liquid crystal alignment function produced by irradiation of ultraviolet rays to cause a photochemical reaction, and made of at least one of polyamic acid made from pyromellitic acid dianhydride, 1,2,3,4-cyclobutane-tetracarboxylic acid dianhydride and diamine, and polyimide obtained by dehydration ring closure of the polyamic acid; and wherein the active matrix type liquid crystal display apparatus has an after image intensity, defined as a magnitude of a brightness change ΔB/B(10%) of a brightness B in an after image portion to a peripheral gray portion having a brightness 10% of a maximum brightness, that is below 3%.