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US5657141A
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Liquid crystal device
Assignee: Canon Inc
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Filing: 1995-06-07
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Granted: 1997-08-12
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Expires: 2015-06-07
Abstract
Abstract A liquid crystal device is constituted by disposing a chiral smectic liquid crystal between a pair of substrates each provided with an electrode and a uniaxial alignment film. The chiral smectic liquid crystal is placed in such a quasi-smectic A alignment state that the liquid crystal molecules will have a single average molecular axis under no electric field application on a lower temperature side within chiral smectic C phase range, wherein the single average molecular axis can be confirmed as a position providing the darkest state when observed through cross nicol polarizers. Such a quasi-smectic A alignment state is effective in providing a liquid crystal device (or display apparatus) having an improved shock resistance and a good low-temperature storage properties.
Inventors
- 👤 Masahiro Terada
- 👤 Syuji Yamada
- 👤 Hiroshi Mizuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:03
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141; G02F1/1416; C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3452; C09K19/3458; C09K19/3466
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
A liquid crystal device, comprising: a pair of substrates and a chiral smectic liquid crystal disposed between the pair of substrates, each of the pair of substrates having an electrode for applying a voltage to the liquid crystal, wherein the chiral smectic liquid crystal is placed in an alignment state in which the liquid crystal molecules have a single average molecular axis perpendicular to the smectic layer of the chiral smectic liquid crystal under no electric field application within a temperature range giving chiral smectic C phase, wherein the single average molecular axis provides the darkest observable state through cross nicol polarizers.
Claim 2
Dependent Claim
102 words
A liquid crystal device, comprising: a pair of substrates and a chiral smectic liquid crystal disposed between the pair of substrates, each of the pair of substrates having an electrode for applying a voltage to the liquid crystal, wherein the chiral smectic liquid crystal is placed in an alignment state in which the liquid crystal molecules have a single average molecular axis perpendicular to the smectic layer of the chiral smectic liquid crystal under no electric field application within a temperature range giving chiral smectic C phase, wherein the single average molecular axis provides the darkest observable state through cross nicol polarizers.
Claim 3
Dependent Claim
27 words
A device according to claim 1, wherein the liquid crystal shows a cone angle H which is less than the cone angle H obtained at room temperature.
Claim 4
Dependent Claim
21 words
A device according to claim 1, wherein the liquid crystal provides a layer inclination angle δ of 6 degrees or less.
Claim 5
Dependent Claim
21 words
A device according to claim 1, wherein the liquid crystal provides a smectic A temperature range of at least 18.2° C.
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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) | 2000-08-11 | 2001-02-10 | 2001-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-11 | 2005-02-10 | 2005-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-11 | 2009-02-10 | 2009-08-12 | $7700.00 | Window Closed / Lapsed |