US5831705A
Expired / Lapsed
US
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Liquid crystal device
Assignee: Canon Inc
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Filing: 1997-04-28
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Granted: 1998-11-03
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Expires: 2017-04-28
Abstract
Abstract A liquid crystal device is constituted by a pair of oppositely disposed substrates including a first substrate having a uniaxial alignment characteristic and a second substrate having a non-uniaxial alignment characteristic and a liquid crystal disposed between the first and second substrates. The first and second substrates are controlled to have surface potentials providing a difference therebetween of less than 50 mV in terms of an absolute value at their liquid crystal-contacting surfaces. As a result, the liquid crystal device is provided with an improved symmetry of switching threshold while retaining a good liquid crystal alignment characteristic.
Inventors
- 👤 Shuzo Kaneko
- 👤 Ihachiro Gofuku
- 👤 Etsuro Kishi
- 👤 Makoto Kojima
- 👤 Katsutoshi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:59
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133397; G02F1/133719; G02F1/133723; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A liquid crystal device, comprising: a pair of oppositely disposed substrates, and a liquid crystal disposed between the substrates, one of the substrates having a uniaxial alignment characteristic, and the other substrate having a non-uniaxial alignment characteristic, wherein the substrate having a non-uniaxial alignment characteristic has a film with a volume resistivity of 10 4 -10 8 ohm·cm in the film thickness direction and a volume resistivity of 10 6 -10 9 ohm.cm in the film extension direction, thus exhibiting a resistivity anisotropy between the film thickness direction and the film extension direction.
Claim 2
Dependent Claim
93 words
A liquid crystal device, comprising: a pair of oppositely disposed substrates, and a liquid crystal disposed between the substrates, one of the substrates having a uniaxial alignment characteristic, and the other substrate having a non-uniaxial alignment characteristic, wherein the substrate having a non-uniaxial alignment characteristic has a film with a volume resistivity of 10 4 -10 8 ohm·cm in the film thickness direction and a volume resistivity of 10 6 -10 9 ohm.cm in the film extension direction, thus exhibiting a resistivity anisotropy between the film thickness direction and the film extension direction.
Claim 3
Dependent Claim
22 words
A liquid crystal device according to claim 1, wherein said film exhibiting a resistivity anisotropy comprises a film formed by wet coating.
Claim 4
Dependent Claim
31 words
A liquid crystal device according to claim 1, wherein said film exhibiting a resistivity anisotropy comprises a matrix material having dispersed therein electroconductive particles with a particle size of 30-300 Å.
Claim 5
Dependent Claim
18 words
A liquid crystal device according to claim 3, wherein said fine particles are doped with an electroconductivity-controlling impurity.
Claim 6
Dependent Claim
18 words
A liquid crystal device according to claim 1, wherein said liquid crystal is a chiral smectic liquid crystal.
Claim 7
Dependent Claim
30 words
A liquid crystal device according to claim 1, wherein said liquid crystal has a phase transition series of isotropic phase, smectic A phase and chiral smectic phase on temperature decrease.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2001-11-02 | 2002-05-04 | 2002-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-02 | 2006-05-04 | 2006-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-02 | 2010-05-04 | 2010-11-03 | $7700.00 | Window Closed / Lapsed |