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In-plane switching type liquid crystal display wherein the upper surface of the first substate having a raised portion

Assignee: Tianma Japan Ltd
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Filing: 1999-09-13
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Granted: 2000-06-06
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Expires: 2019-09-13
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Abstract

Abstract There is provided a liquid crystal display including (a) a first substrate, (b) a second substrate spaced away from and facing the first substrate, (c) a liquid crystal layer sandwiched between the first and second substrates, (d) a first electrode formed on the first substrate at a surface facing the liquid crystal layer, (e) a second electrode formed on the first substrate at a surface facing the liquid crystal layer, and cooperating with the first electrode to form a pixel, the first and second electrodes generating an electric field therebetween to thereby implement in-plane switching, and (f) an interlayer insulating film formed at least below the second electrode, but not formed at least below the first electrode, a dielectric layer formed between at least a part of an upper surface of the first electrode and the liquid crystal layer being designed to have a capacitance per a unit area, almost equal to a capacitance per a unit area of a dielectric layer formed between at least a part of an upper surface and the liquid crystal layer. In the abovementioned liquid crystal display, since a dielectric distance between the first electrode and the liquid crystal layer is almost equal to a dielectric distance between the second electrode and the liquid crystal layer, it is possible to balance flexo-electric effects on the first and second electrodes, which ensures suppression in generation of after-images.

Inventors

  • 👤 Nolifumi Sato

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 18:11
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134363; G02F1/1345; G02F1/136; G02F1/1362

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 202 words
A liquid crystal display comprising: (a) a first substrate having an upper surface with at least one raised portion; (b) a second substrate spaced away from and facing said first substrate; (c) a liquid crystal layer sandwiched between said first and second substrates; (d) a first electrode formed on said upper surface of the first substrate facing said liquid crystal layer, at least a part of said first electrode being formed on said raised portion; (e) a second electrode formed on said first substrate at a surface facing said liquid crystal layer, and cooperating with said first electrode to form a pixel, said first and second electrodes generating an electric field therebetween to thereby implement in-plane switching; and (f) an interlayer insulating film formed at least below said second electrode, but not formed at least below said first electrode, a dielectric layer formed between at least a part of an upper surface of said first electrode and said liquid crystal layer being designed to have a capacitance per a unit area, almost equal to a capacitance per a unit area of a dielectric layer formed between at least a part of an upper surface of the second substrate of the first substrate.
Claim 2
Dependent Claim 202 words
A liquid crystal display comprising: (a) a first substrate having an upper surface with at least one raised portion; (b) a second substrate spaced away from and facing said first substrate; (c) a liquid crystal layer sandwiched between said first and second substrates; (d) a first electrode formed on said upper surface of the first substrate facing said liquid crystal layer, at least a part of said first electrode being formed on said raised portion; (e) a second electrode formed on said first substrate at a surface facing said liquid crystal layer, and cooperating with said first electrode to form a pixel, said first and second electrodes generating an electric field therebetween to thereby implement in-plane switching; and (f) an interlayer insulating film formed at least below said second electrode, but not formed at least below said first electrode, a dielectric layer formed between at least a part of an upper surface of said first electrode and said liquid crystal layer being designed to have a capacitance per a unit area, almost equal to a capacitance per a unit area of a dielectric layer formed between at least a part of an upper surface of the second substrate of the first substrate.
Claim 3
Dependent Claim 32 words
The liquid crystal display as set forth in claim 1, further comprising an insulating film formed on said first substrate, a recessed portion being formed at a surface of said insulating film.
Claim 4
Dependent Claim 22 words
The liquid crystal display as set forth in claim 1, further comprising a flat insulating film covering said first and second electrodes.
Claim 5
Dependent Claim 21 words
The liquid crystal display as set forth in claim 3, wherein said flat insulating film is composed predominantly of organic polymer.
Claim 6
Dependent Claim 21 words
The liquid crystal display as set forth in claim 3, wherein said flat insulating film acts also as an alignment layer.
Claim 7
Dependent Claim 27 words
The liquid crystal display as set forth in claim 1, further comprising a flexo-electric relieving layer composed of electrically insulating material and formed on said second electrode.
Claim 8
Dependent Claim 22 words
The liquid crystal display as set forth in claim 6, wherein said flexo-electric relieving layer is almost coextensive with said second electrode.
Claim 9
Dependent Claim 32 words
The liquid crystal display as set forth in claim 6, wherein said flexo-electric relieving layer has the same thickness as a thickness of said interlayer insulating layer formed on said first electrode.
Claim 10
Dependent Claim 45 words
The liquid crystal display as set forth in claim 6, wherein said flexo-electric relieving layer has a ratio of a thickness to a dielectric constant, which ratio is almost equal to a ratio of a thickness to a dielectric constant, of said interlayer insulating layer.

References Cited (Backward Citations)

US5572345A Cited
US5514850A Cited
JPH07159786A Cited
US5914761A Cited
JPH07128683A Cited
US5399390A Cited
JPH08220518A Cited
US5986735A Cited
US5907379A Cited
US5979708A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2003-06-06 2003-12-06 2004-06-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2007-06-06 2007-12-06 2008-06-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2011-06-06 2011-12-06 2012-06-06 $7700.00 Window Closed / Lapsed

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