Active matrix type liquid crystal display apparatus
First Claim
1. 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;
whereinthe 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
whereinthe active matrix type liquid crystal display apparatus has an after image intensity, defined as a magnitude of a brightness change Δ
B/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%.
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Abstract
An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; and electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N−I) of a liquid crystal composite forming the liquid crystal layer.
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Citations
11 Claims
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1. An active matrix type liquid crystal display apparatus having a plurality of thin film transistors, comprising:
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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;
whereinthe 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
whereinthe active matrix type liquid crystal display apparatus has an after image intensity, defined as a magnitude of a brightness change Δ
B/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%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification