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US 2004/0169777 A1Published application
Liquid crystal display device
OwnerShinichiro Tanaka, Takashi Ikemoto +3inventors
InventorsShinichiro Tanaka, Takashi Ikemoto, Yoshitaka Mori, Satoshi Morita, Osamu Kobayashi
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Abstract
An MVA liquid crystal display device capable of obtaining optimal display state by eliminating display irregularities so that liquid crystal molecules maintain an ideal inclination direction. Transmission light passing through a liquid crystal layer is efficiently utilized by defining an angle of correction on a strip-like projection (12) and a corresponding slit (6) formed on a first or second substrate, changing the outline of signal line (3) and the shape of an edge part of a pixel electrode (4), and optimizing the direction of extension of the transmission axis of a polarizer and the slit.
Claims38
A liquid crystal display device comprising:
- a first substrate having pixel electrodes formed thereon in a matrix-like formation;
- a second substrate having a transparent electrode formed thereon;
- strip-like projections formed on one of the first and second substrates;
- slits formed in the other of the first and second substrates so as to correspond to the projections;
- alignment films laid on the first and second substrates individually and subjected to vertical alignment treatment;
- and
- a liquid crystal layer sandwiched between the first and second substrates and having negative dielectric constant anisotropy,
- liquid crystal molecules being aligned, when no electric field is applied to the liquid crystal layer, vertically and, when an electric field is applied to the liquid crystal layer, in a direction to which the liquid crystal molecules are restricted by the slits and the projections,
- wherein the slits are formed substantially parallel to directions in which the projections extend, and
- parts of contours of the slits facing the projections are formed in directions deviated by a correction angle from directions in which the slits themselves extend.
7 more elements
A liquid crystal display device comprising:
- a first substrate having pixel electrodes formed thereon in a matrix-like formation;
- a second substrate having a transparent electrode formed thereon;
- strip-like projections formed on one of the first and second substrates,
- slits formed in the other of the first and second substrates so as to correspond to the projections;
- alignment films laid on the first and second substrates individually and subjected to vertical alignment treatment;
- and
- a liquid crystal layer sandwiched between the first and second substrates and having negative dielectric constant anisotropy,
- liquid crystal molecules being aligned, when no electric field is applied to the liquid crystal layer, vertically and, when an electric field is applied to the liquid crystal layer, in a direction to which the liquid crystal molecules are restricted by the slits and the projections,
- wherein the slits are formed substantially parallel to directions in which the projections extend, and
- parts of contours of the projections facing the slits are formed in directions deviated by a correction angle from the directions in which the projections themselves extend.
7 more elements
A liquid crystal display device comprising:
- a first substrate having pixel electrodes formed thereon in a matrix-like formation;
- a second substrate having a transparent electrode formed thereon;
- strip-like projections formed on one of the first and second substrates,
- slits formed in the other of the first and second substrates so as to correspond to the projections;
- alignment films laid on the first and second substrates individually and subjected to vertical alignment treatment;
- and
- a liquid crystal layer sandwiched between the first and second substrates and having negative dielectric constant anisotropy,
- liquid crystal molecules being aligned, when no electric field is applied to the liquid crystal layer, vertically and, when an electric field is applied to the liquid crystal layer, in a direction to which the liquid crystal molecules are restricted by the slit and the projection,
- wherein the slits are formed substantially parallel to directions in which the projections extend,
- parts of contours of the slits facing the projections are formed in directions deviated by a first correction angle from directions in which the slits themselves extend, and
- parts of contours of the projections facing the slits are formed in directions deviated by a second correction angle from the directions in which the projections themselves extend.
8 more elements
A liquid crystal display device comprising:
- a first substrate having pixel electrodes formed thereon in a matrix-like formation;
- a second substrate having a transparent electrode formed thereon;
- strip-like projections formed on one of the first and second substrates,
- slits formed in the other of the first and second substrates so as to correspond to the projections;
- alignment films laid on the first and second substrates individually and subjected to vertical alignment treatment;
- and
- a liquid crystal layer sandwiched between the first and second substrates and having negative dielectric constant anisotropy,
- liquid crystal molecules being aligned, when no electric field is applied to the liquid crystal layer, vertically and, when an electric field is applied to the liquid crystal layer, in a direction to which the liquid crystal molecules are restricted by the slit and the projection,
- wherein, in edge portions of the pixel electrodes, there is provided alleviating means for alleviating an influence of the electric field that acts on the liquid crystal molecules from the edge portions.
6 more elements
A liquid crystal display device comprising:
- a first substrate having pixel electrodes formed thereon in a matrix-like formation;
- slits formed in the pixel electrodes;
- a second substrate having a transparent electrode formed thereon;
- strip-like projections formed on the second substrate so as to correspond to the slits;
- alignment films laid on the first and second substrates individually and subjected to vertical alignment treatment;
- a liquid crystal layer sandwiched between the first and second substrates and having negative dielectric constant anisotropy;
- a first polarizer laid on an outside of the first substrate;
- and
- a second polarizer laid on an outside of the second substrate and having a transmission axis perpendicular to a transmission axis of the first polarizer,
- liquid crystal molecules being aligned, when no electric field is applied to the liquid crystal layer, vertically and, when an electric field is applied to the liquid crystal layer, in a direction to which the liquid crystal molecules are restricted by the slits and the projections,
- wherein parts of contours of the slits facing the projections are formed in directions deviated by a correction angle from directions that are at 45° to the transparent axis of one of the polarizers.
8 more elements
A liquid crystal display device comprising:
- a first substrate having pixel electrodes formed thereon in a matrix-like formation;
- slits formed in the pixel electrodes;
- a second substrate having a transparent electrode formed thereon;
- strip-like projections formed on the second substrate so as to correspond to the slits;
- alignment films laid on the first and second substrates individually and subjected to vertical alignment treatment;
- a liquid crystal layer sandwiched between the first and second substrates and having negative dielectric constant anisotropy;
- a first polarizer laid on an outside of the first substrate;
- and
- a second polarizer laid on an outside of the second substrate and having a transmission axis perpendicular to a transmission axis of the first polarizer,
- liquid crystal molecules being aligned, when no electric field is applied to the liquid crystal layer, vertically and, when an electric field is applied to the liquid crystal layer, in a direction to which the liquid crystal molecules are restricted by the slits and the projections,
- wherein parts of contours of the projections facing the slits are formed in directions deviated by a correction angle from directions that are at 45° to the transparent axis of one of the polarizers.
8 more elements
A liquid crystal display device comprising:
- a first substrate having a plurality of scanning lines and a plurality of signal lines formed thereon in a matrix-like formation;
- switching devices formed at intersections between the scanning lines and the signal lines;
- pixel electrodes formed in areas surrounded by the scanning lines and the signal lines and connected to the switching devices;
- a second substrate arranged face-to-face to the first substrate and having color filters formed thereon so as to correspond to the pixel electrodes;
- and
- liquid crystal sealed between the first and second substrates,
- wherein at least parts of edge portions of the pixel electrodes facing signal lines are formed in zigzags, and parts of contours of the signal lines facing the pixel electrodes are so formed as to run along the edge portions of the pixel electrodes.
4 more elements
A liquid crystal display device comprising:
- a first substrate having pixel electrodes formed thereon in a matrix-like formation;
- a second substrate having a transparent electrode formed thereon;
- strip-like projections formed on the second substrate so as to obliquely cross, as observed from a direction normal to the second substrate, edge portions of the pixel electrodes;
- slits formed in the pixel electrodes so as to be parallel to the projections adjacent thereto;
- alignment films laid on the first and second substrates individually and subjected to vertical alignment treatment;
- and
- a liquid crystal layer sandwiched between the first and second substrates and having negative dielectric constant anisotropy,
- liquid crystal molecules being aligned, when no electric field is applied to the liquid crystal layer, vertically and, when an electric field is applied to the liquid crystal layer, in a direction to which the liquid crystal molecules are restricted by the slits and the projections,
- wherein parts of edge portions of the pixel electrodes are formed in a sawtooth shape, and the sawtooth-shaped portions are located between the projections and the slits, at places where the slits approach the edge portions at an angle of 90° or less.
6 more elements
Dependencies are inferred from the claim text.