Liquid crystal display device and liquid crystal orientation method
AssigneesFujitsu Limited, Fujitsu Display Technologies Corporation
InventorsArihiro Takeda, Shingo Kataoka, Tsuyoshi Kamada, Kazuya Ueda, Takahiro Sasaki
Life of this patent
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Abstract
A slit pattern, which is an orientation control element extending in an oblique direction relative to an edge of a pixel electrode on a surface of a TFT substrate, is formed in the pixel electrode to extend in a substantially parallel direction to an extending direction of a bank-shaped pattern. Furthermore, as an orientation control element, fine slit patterns (concave portions in the pixel electrode) are formed locally in a part near the edge of the pixel electrode except in the pixel electrode to extend in an oblique direction relative to an extending direction of the edge.
Claims33
A liquid crystal display device comprising:
- a first substrate having thereon a pixel electrode and an active element;
- a second substrate having thereon an opposed electrode;
- and
- a liquid crystal layer interposed between said first and second substrates with said electrodes facing each other,
- wherein when a direction of an orientation regulating force given to liquid crystal molecules of said liquid crystal layer within a region of said pixel electrode is taken as a first direction and a direction of an orientation regulating force due to an edge of said pixel electrode on said first substrate given to said liquid crystal molecules near said edge is taken as a second direction, an orientation control element giving an orientation regulating force in a third direction which counteracts said orientation regulation force in said second direction is locally provided in a part near said edge.
A liquid crystal display device comprising:
- a first substrate having thereon a pixel electrode and an active element;
- a second substrate having thereon an opposed electrode;
- and
- a liquid crystal layer interposed between said first and second substrates with said electrodes facing each other,
- wherein an orientation control element giving an orientation regulating force to liquid crystal molecules near an edge of said pixel electrode on said first substrate is locally provided near said edge on said first substrate so that said liquid crystal molecules including those near said edge are oriented in substantially the same direction, when difference in orientation direction among said liquid crystal molecules adjacent to each other near said edge is caused by an orientation regulating force given by said edge of said pixel electrode to said liquid crystal molecules of said liquid crystal layer when voltage is being applied between said pixel and opposed electrodes.
A liquid crystal display device comprising:
- a first substrate having thereon a pixel electrode and an active element;
- a second substrate having thereon an opposed electrode;
- and
- a liquid crystal layer interposed between said first and second substrates with said electrodes facing each other,
- wherein a first orientation control element extending in a nonparallel direction relative to an extending direction of an edge of said pixel electrode and a second orientation control element extending in a parallel direction relative to an extending direction of said edge are provided on at least one of said first and second substrates, and
- said first orientation control element is larger in width than said second orientation control element.
A liquid crystal display device comprising:
- a first substrate having thereon a pixel electrode and an active element;
- a second substrate having thereon an opposed electrode;
- and
- a liquid crystal layer interposed between said first and second substrates with said electrodes facing each other,
- wherein a first orientation control element extending in a nonparallel direction relative to an extending direction of an edge of said pixel electrode and a second orientation control element extending in a parallel direction relative to an extending direction of said edge are provided on at least one of said first and second substrates, and
- liquid crystal molecules of said liquid crystal layer on said second orientation control element are non-vertically oriented relative to said substrate when no voltage is being applied between said pixel and opposed electrodes.
A liquid crystal display device comprising:
- a first substrate having thereon a pixel electrode and an active element;
- a second substrate having thereon an opposed electrode;
- and
- a liquid crystal layer interposed between said first and second substrates with said electrodes facing each other,
- wherein a first orientation control element extending in a nonparallel direction relative to an extending direction of an edge of said pixel electrode and a second orientation control element extending in a parallel direction relative to an extending direction of said edge are provided on at least one of said first and second substrates, and
- at least a part of liquid crystal molecules of said liquid crystal layer on said second orientation control element are oriented in a vertical direction relative to said substrate when voltage is being applied between said pixel and opposed electrodes.
A liquid crystal display device comprising:
- a first substrate having thereon a pixel electrode and an active element;
- a second substrate having thereon an opposed electrode;
- and
- a liquid crystal layer interposed between said first and second substrates with said electrodes facing each other,
- wherein a first orientation control element extending in a nonparallel direction relative to an extending direction of an edge of said pixel electrode and a second orientation control element extending in a parallel direction relative to an extending direction of said edge are provided on at least one of said first and second substrates, and
- said second orientation control element is constituted by an assembly of shapes having directivity in a direction of the substrate's plane surface.
A liquid crystal orientation method of liquid crystal molecules of a liquid crystal layer in a liquid crystal display device comprising a first substrate having thereon a pixel electrode and an active element, a second substrate having thereon an opposed electrode, and said liquid crystal layer interposed between said first and second substrates with said electrodes facing each other, said method comprising the step of:
- giving an orientation regulating force to a part near an edge of said pixel electrode on said first substrate in a third direction which is different from a first direction of an orientation regulating force given to said liquid crystal molecules of said liquid crystal layer within a region of said pixel electrode and a second direction of an orientation regulating force given due to said edge of said pixel electrode on said first substrate to said liquid crystal molecules near said edge.
A liquid crystal orientation method of liquid crystal molecules of a liquid crystal layer in a liquid crystal display device comprising a first substrate having thereon a pixel electrode and an active element, a second substrate having thereon an opposed electrode, and said liquid crystal layer interposed between said first and second substrates with said electrodes facing each other, said method comprising the step of:
- giving an orientation regulating force to said liquid crystal molecules near an edge of said pixel electrode on said first substrate so that said liquid crystal molecules including those near said edge are oriented in substantially the same direction, when difference in orientation direction among said liquid crystal molecules adjacent to each other near said edge is caused by an orientation regulating force given to said liquid crystal molecules of said liquid crystal layer due to said edge of said pixel electrode when voltage is being applied between said pixel and opposed electrodes.
Dependencies are inferred from the claim text.