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US5552914A
Expired / Lapsed
US
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Liquid crystal display having a fine particle-dispersion layer on at least one side of the liquid crystal layer
Assignee: Canon Inc
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Filing: 1995-05-26
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Granted: 1996-09-03
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Expires: 2015-05-26
Abstract
Abstract A liquid crystal display device is constituted by a pair of oppositely disposed substrates each having a plurality of opposing electrodes, and a ferroelectric liquid crystal disposed between the substrates so as to form a plurality of pixels each composed by a combination of a pair of the opposing electrodes and the ferroelectric liquid crystal disposed therebetween. Each pixel is provided with regions of different polarity inversion threshold voltages, and at least one of the pair of opposing electrodes is provided with a plurality of regions having unevennesses at different densities including a region with a higher density of unevennesses corresponding to a region of a lower polarity inversion threshold voltage and a region with a lower density of unevennesses corresponding to a region of a higher polarity inversion threshold voltage.
Inventors
- 👤 Katsuhiko Shinjo
- 👤 Tetsuya Kaneko
- 👤 Shuzo Kaneko
- 👤 Takeo Tsukamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:20
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133371; G02F1/133345; G02F1/137; G02F1/139; G02F1/141; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3614; G02F1/1343; G02F1/13439; G02F2203/00; G02F2203/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
78 words
A liquid crystal optical device: comprising a plurality of pixels each comprising a pair of opposing electrodes and a ferroelectric liquid crystal layer disposed between the opposing electrodes, wherein at least one opposing electrode is coated with a fine particle-dispersion layer containing electroconductive ultrafine particles having an average particle size of 30-300 Å and further an alignment control layer disposed to allow a local direct contact of the fine particle dispersion layer with the ferroelectric liquid crystal layer.
Claim 2
Dependent Claim
78 words
A liquid crystal optical device: comprising a plurality of pixels each comprising a pair of opposing electrodes and a ferroelectric liquid crystal layer disposed between the opposing electrodes, wherein at least one opposing electrode is coated with a fine particle-dispersion layer containing electroconductive ultrafine particles having an average particle size of 30-300 Å and further an alignment control layer disposed to allow a local direct contact of the fine particle dispersion layer with the ferroelectric liquid crystal layer.
Claim 3
Dependent Claim
31 words
A device according to Claim 1, wherein said alignment control layer has an average thickness at its film-retaining portion which is smaller than the average particle size of the ultrafine particles.
Claim 4
Dependent Claim
24 words
A device according to Claim 1 or 2, wherein said alignment control layer has an average thickness at its film-retaining portion of 20-100 Å.
Claim 5
Dependent Claim
28 words
A device according to Claim 1 or 2, wherein said pair of opposing electrodes are respectively provided with alignment control layers which have substantially anti-parallel alignment control directions.
Claim 6
Dependent Claim
17 words
A device according to Claim 1 or 2, wherein said fine particles-dispersion layer comprises a matrix polymer.
Claim 7
Dependent Claim
37 words
A device according to Claim 1 or 2, wherein said ferroelectric liquid crystal is provided with an apparently increased tilt angle by application of an AC electric field after disposing the liquid crystal between the opposing electrodes.
Claim 8
Dependent Claim
99 words
A liquid crystal optical device comprising a plurality of pixels each comprising a pair of opposing electrodes and a chiral smectic liquid crystal layer disposed in a thickness between the opposing electrodes, wherein: each pixel comprises projections and a film covering the projections and containing particles having an average particle size of 30-300 Å on at least one of the opposing electrodes; the projections have a height larger than the average particle size of the particles; and the projections are disposed at a pitch which is substantially equal to or larger than the thickness of the liquid crystal layer.
Claim 9
Dependent Claim
99 words
A liquid crystal optical device comprising a plurality of pixels each comprising a pair of opposing electrodes and a chiral smectic liquid crystal layer disposed in a thickness between the opposing electrodes, wherein: each pixel comprises projections and a film covering the projections and containing particles having an average particle size of 30-300 Å on at least one of the opposing electrodes; the projections have a height larger than the average particle size of the particles; and the projections are disposed at a pitch which is substantially equal to or larger than the thickness of the liquid crystal layer.
Claim 10
Dependent Claim
11 words
A device according to Claim 7, wherein the particles are electroconductive.
Claim 11
Dependent Claim
12 words
A device according to Claim 7, wherein the particles are unevenly dispersed.
Claim 12
Dependent Claim
19 words
A device according to Claim 9, wherein the particles have a self-aligning property at a time of dispersion application.
Claim 13
Dependent Claim
79 words
A liquid crystal optical device comprising a plurality of pixels each comprising a pair of opposing electrodes and a chiral smectic liquid crystal layer disposed between the opposing electrodes, wherein at least one opposing electrode is coated with a fine particle-dispersion layer, containing electroconductive ultrafine particles having an average particle size of 30-300 Å and an alignment control layer disposed to allow a local direct contact of the fine particle dispersion layer with the chiral smectic liquid crystal layer.
Claim 14
Dependent Claim
79 words
A liquid crystal optical device comprising a plurality of pixels each comprising a pair of opposing electrodes and a chiral smectic liquid crystal layer disposed between the opposing electrodes, wherein at least one opposing electrode is coated with a fine particle-dispersion layer, containing electroconductive ultrafine particles having an average particle size of 30-300 Å and an alignment control layer disposed to allow a local direct contact of the fine particle dispersion layer with the chiral smectic liquid crystal layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-03 | 2000-03-04 | 2000-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-03 | 2004-03-04 | 2004-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-03 | 2008-03-04 | 2008-09-03 | $7700.00 | Window Closed / Lapsed |