Patent US5541752A successfully refreshed from Google Patents.
US5541752A
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US
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Liquid crystal apparatus
Assignee: Canon Inc
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Filing: 1994-08-01
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Granted: 1996-07-30
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Expires: 2014-08-01
Abstract
Abstract A liquid crystal cell is constituted by a pair of substrates respectively provided with scanning electrodes or data electrodes and uniaxial alignment axes which are substantially parallel with each other and substantially in the same direction, and a ferroelectric liquid crystal disposed between the substrates. At least one of the substrates is provided with ridges having a height at least one third of the spacing between the substrates or stripe transparent electrodes having thereon a stripe conductor film extending in the longitudinal direction of an associated one of the stripe transparent electrodes.
Inventors
- 👤 Osamu Taniguchi
- 👤 Yoshio Hotta
- 👤 Shinjiro Okada
- 👤 Hironobu Mizuno
- 👤 Yutaka Inaba
- 👤 Yukio Hanyu
- 👤 Tadashi Mihara
- 👤 Yasuto Kodera
- 👤 Katsutoshi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:46
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133371; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
268 words
A liquid crystal apparatus, comprising: (a) a liquid crystal panel comprising a pair of substrates respectively provided with a group of parallel transparent stripe electrodes which are disposed to intersect each other with a spacing therebetween, and a chiral smectic liquid crystal disposed between the substrates, the chiral smectic liquid crystal being free from its helical structure and formed in a plurality of smectic layers each organized by plural liquid crystal molecules which are aligned in one of two stable states with a pretilt angle of at least 5 degrees with respect to the substrates, the smectic layers being inclined with respect to the substrates so as to form a clockwise dull angle with one of the substrates and a counterclockwise dull angle with the other of the substrates, thereby being bent between the substrates, the smectic layers being further aligned to have normals providing a common protection extending in one direction onto one of the substrates, and (b) drive means for applying a voltage signal causing one or another orientation state of the chiral smectic liquid crystal and an AC voltage not causing a transition from said one to another or said another to one orientation state of the liquid crystal, said AC voltage causing movement of the liquid crystal molecules within the respective smectic layers, wherein the transparent parallel stripe electrodes on one of said pair of substrates are respectively provided with a stripe conductor film contacting the stripe electrode and extending in a direction substantially parallel to said common projection so as to suppress the movement of liquid crystal molecules within the respective smectic layers.
Claim 2
Dependent Claim
268 words
A liquid crystal apparatus, comprising: (a) a liquid crystal panel comprising a pair of substrates respectively provided with a group of parallel transparent stripe electrodes which are disposed to intersect each other with a spacing therebetween, and a chiral smectic liquid crystal disposed between the substrates, the chiral smectic liquid crystal being free from its helical structure and formed in a plurality of smectic layers each organized by plural liquid crystal molecules which are aligned in one of two stable states with a pretilt angle of at least 5 degrees with respect to the substrates, the smectic layers being inclined with respect to the substrates so as to form a clockwise dull angle with one of the substrates and a counterclockwise dull angle with the other of the substrates, thereby being bent between the substrates, the smectic layers being further aligned to have normals providing a common protection extending in one direction onto one of the substrates, and (b) drive means for applying a voltage signal causing one or another orientation state of the chiral smectic liquid crystal and an AC voltage not causing a transition from said one to another or said another to one orientation state of the liquid crystal, said AC voltage causing movement of the liquid crystal molecules within the respective smectic layers, wherein the transparent parallel stripe electrodes on one of said pair of substrates are respectively provided with a stripe conductor film contacting the stripe electrode and extending in a direction substantially parallel to said common projection so as to suppress the movement of liquid crystal molecules within the respective smectic layers.
Claim 3
Dependent Claim
23 words
A liquid crystal apparatus according to claim 1, wherein each stripe transparent electrode is provided with a plurality of the stripe conductor film.
Claim 4
Dependent Claim
24 words
A liquid crystal apparatus according to claim 1, wherein the stripe conductor film is disposed between the stripe transparent electrode and the liquid crystal.
Claim 5
Dependent Claim
23 words
A liquid crystal apparatus according to claim 1, wherein the stripe conductor film is disposed between the stripe transparent electrode and the substrate.
Claim 6
Dependent Claim
39 words
A liquid crystal apparatus according to claim 1, wherein the pair of substrates have been provided with uniaxial alignment axes which are parallel with each other and in the same direction that is substantially identical to said second direction.
Claim 7
Dependent Claim
18 words
A liquid crystal apparatus according to claim 5, wherein said uniaxial alignment axes have been provided by rubbing.
Claim 8
Dependent Claim
53 words
A liquid crystal apparatus according to claim 1, wherein said smectic layers are inclined at an inclination angle δ from a normal to the substrates, the liquid crystal molecules are tilted at a pretilt angle α, and the chiral smectic liquid crystal shows a maximum tilt angle H satisfying a relationship of H<α+δ.
Claim 9
Dependent Claim
36 words
A liquid crystal apparatus according to claim 7, wherein said chiral smectic liquid crystal shows a tilt angle θ a under application of said AC voltage, the θ a satisfying a relationship of H>θ a >H/2.
Claim 10
Dependent Claim
52 words
A liquid crystal apparatus according to claim 1, wherein the pair of substrates have been provided with uniaxial alignment axes which are substantially in the same direction but deviated at an angle of 2-15 degrees from each other to provide a central axis therebetween which is substantially identical to said second direction.
Claim 11
Dependent Claim
18 words
A liquid crystal apparatus according to claim 9, wherein said uniaxial alignment axes have been provided by rubbing.
References Cited (Backward Citations)
US4763995A
Cited
US4639089A
Cited
GB2157451A
Cited
US4720173A
Cited
FR2561005A1
Cited
US4712873A
Cited
US4715688A
Cited
US4682858A
Cited
US4714323A
Cited
US4681404A
Cited
US4712877A
Cited
US4707078A
Cited
US4712875A
Cited
US4775225A
Cited
US4778259A
Cited
US4738515A
Cited
US5013137A
Cited
US4728176A
Cited
US4747671A
Cited
US4740060A
Cited
US4712874A
Cited
US4883344A
Cited
US4796980A
Cited
US4796979A
Cited
US4824218A
Cited
JPS62280721A
Cited
US4765720A
Cited
US4900132A
Cited
US4859036A
Cited
US5000545A
Cited
US4932757A
Cited
US4932758A
Cited
US5007716A
Cited
EP0444705A2
Cited
US5189536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-30 | 2000-01-29 | 2000-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-30 | 2004-01-29 | 2004-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-30 | 2008-01-29 | 2008-07-30 | $7700.00 | Window Closed / Lapsed |