US4721367A
Expired / Lapsed
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Liquid crystal device
Assignee: Canon Inc
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Filing: 1986-03-24
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Granted: 1988-01-26
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Expires: 2006-03-24
Abstract
Abstract A liquid crystal compound represented by the formula (I) below or a liquid crystal composition containing the compound is interposed between a pair of base plates. ##STR1## wherein R is an alkyl or alkoxy group having 1-18 carbon atoms; m is 0 or 1; R 1 is an alkyl group having 1 to 18 carbon atoms when m is 0 and is an alkyl or alkoxy group having 1-18 carbon atoms when m is 1. The liquid crystal compound or composition is in a chiral smectic phase formed through a phase transition from a higher temperature phase. At least one of the base plates has a face to which an orientation controlling function is imparted for preferentially orienting the liquid crystal molecules in contact with the face in one direction.
Inventors
- 👤 Kazuo Yoshinaga
- 👤 Akira Tsuboyama
- 👤 Kazuharu Katagiri
- 👤 Osamu Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:57
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3452; C09K2323/00; C09K2323/02; C09K2323/025
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
147 words
A liquid crystal device comprising a cell structure including a pair of base plates and a liquid crystal compound represented by the formula (I) shown below or liquid crystal composition containing the compound and interposed between the pair of base plates; said liquid crystal compound or composition being in a smectic phase formed through a phase transition from a higher temperature phase, a face of at least one of said pair of base plates having been provided with a function of preferentially orienting the axes of the liquid crystal molecules contacting the face in one direction: formula (I) ##STR99## wherein R is an alkyl or alkoxy group having 1-18 carbon atoms; m is 0 or 1; R 1 is an alkyl group having 1 to 18 carbon atoms when m is 0 and is an alkyl or alkoxy group having 1-18 carbon atoms when m is 1.
Claim 2
Dependent Claim
147 words
A liquid crystal device comprising a cell structure including a pair of base plates and a liquid crystal compound represented by the formula (I) shown below or liquid crystal composition containing the compound and interposed between the pair of base plates; said liquid crystal compound or composition being in a smectic phase formed through a phase transition from a higher temperature phase, a face of at least one of said pair of base plates having been provided with a function of preferentially orienting the axes of the liquid crystal molecules contacting the face in one direction: formula (I) ##STR99## wherein R is an alkyl or alkoxy group having 1-18 carbon atoms; m is 0 or 1; R 1 is an alkyl group having 1 to 18 carbon atoms when m is 0 and is an alkyl or alkoxy group having 1-18 carbon atoms when m is 1.
Claim 3
Dependent Claim
17 words
A liquid crystal device according to claim 1, wherein R 1 is an optically active 2-methylbutyl group.
Claim 4
Dependent Claim
17 words
A liquid crystal device according to claim 1, wherein R 1 is an optically active 2-methylbutoxy group.
Claim 5
Dependent Claim
21 words
A liquid crystal device according to claim 1, wherein said higher temperature phase is cholesteric phase, nematic phase, or isotropic phase.
Claim 6
Dependent Claim
17 words
A liquid crystal device according to claim 1, wherein said smectic phase is a chiral smectic phase.
Claim 7
Dependent Claim
38 words
A liquid crystal device according to claim 5, wherein said chiral smectic phase is a phase wherein liquid crystal molecules oriented to at least a first stable state and a second stable state occur under no electric field.
Claim 8
Dependent Claim
35 words
A liquid crystal device according to claim 1, wherein said liquid crystal composition contains at least a liquid crystal compound represented by the formula (I) and another liquid crystal compound showing a chiral smectic phase.
Claim 9
Dependent Claim
24 words
A liquid crystal device according to claim 7, wherein said another liquid crystal compound is a liquid crystal compound also showing smectic A phase.
Claim 10
Dependent Claim
23 words
A liquid crystal device according to claim 7, wherein said another liquid crystal compound is a liquid crystal compound also showing cholestric phase.
Claim 11
Dependent Claim
27 words
A liquid crystal device according to claim 7, wherein said another liquid crystal compound is a liquid crystal compound also showing smectic A phase and cholesteric phase.
Claim 12
Dependent Claim
36 words
A liquid crystal device according to claim 1, wherein said liquid crystal composition contains at least a liquid crystal compound represented by the formula (I) and another liquid crystal compound not showing a chiral smectic phase.
Claim 13
Dependent Claim
24 words
A liquid crystal device according to claim 11, wherein said another liquid crystal compound is a liquid crystal compound also showing smectic A phase.
Claim 14
Dependent Claim
23 words
A liquid crystal device according to claim 11, wherein said another liquid crystal compound is a liquid crystal compound also showing cholesteric phase.
Claim 15
Dependent Claim
27 words
A liquid crystal device according to claim 11, wherein said another liquid crystal compound is a liquid crystal compound also showing smectic A phase and cholesteric phase.
Claim 16
Dependent Claim
31 words
A liquid crystal device according to claim 1, wherein said function of preferentially orienting the molecular axes in one direction has been imparted by a rubbing treatment of the base plate.
Claim 17
Dependent Claim
20 words
A liquid crystal device according to claim 15, wherein the base plate has a coating film of an insulating material.
Claim 18
Dependent Claim
61 words
A liquid crystal device according to claim 16, wherein said insulating material comprises at least one material selected from the group consisting of SiO, SiO 2 , Al 2 O 3 , TiO 2 , polyvinyl alcohol, polyimide, polyamide-imide, polyester-imide, polyparaxylylene, polyester, polycarbonate, polyvinyl acetal, polyvinyl chloride, polyamide, polystyrene, cellulose resin, melamine resin, urea resin, acrylic resin and a photoresist resin.
Claim 19
Dependent Claim
14 words
A liquid crystal device according to claim 16, wherein said insulating material comprises polyimide.
Claim 20
Dependent Claim
15 words
A liquid crystal device according to claim 16, wherein said insulating material comprises polyvinyl alcohol.
Claim 21
Dependent Claim
14 words
A liquid crystal device according to claim 16, wherein said insulating material comprises polyamide.
Claim 22
Dependent Claim
31 words
A liquid crystal device according to claim 1, wherein said function of preferentially orienting the molecular axes in one direction has been imparted by oblique vapor deposition onto the base plate.
Claim 23
Dependent Claim
182 words
A liquid crystal device, comprising: a plurality of picture elements arranged in a plurality of rows, each picture element comprising a pair of oppositely spaced electrodes and a liquid crystal compound represented by the formula (I) shown below or a liquid crystal composition containing the compound interposed between the electrodes, the liquid crystal compound or composition showing at least two stable states and being oriented to one of said at least two stable states, said liquid crystal device being driven by a line-by-line writing scheme wherein a writing signal is applied to the picture elements row by row, and the written state of one row of picture elements to which the writing signal has been applied is retained until the subsequent writing signal is applied to the row of picture elements; formula (I) ##STR100## wherein R is an alkyl or alkoxy group having 1-18 carbon atoms; m is 0 or 1; R 1 is an alkyl group having 1 to 18 carbon atoms when m is 0 and is an alkyl or alkoxy group having 1-18 carbon atoms when m is 1.
Claim 24
Dependent Claim
182 words
A liquid crystal device, comprising: a plurality of picture elements arranged in a plurality of rows, each picture element comprising a pair of oppositely spaced electrodes and a liquid crystal compound represented by the formula (I) shown below or a liquid crystal composition containing the compound interposed between the electrodes, the liquid crystal compound or composition showing at least two stable states and being oriented to one of said at least two stable states, said liquid crystal device being driven by a line-by-line writing scheme wherein a writing signal is applied to the picture elements row by row, and the written state of one row of picture elements to which the writing signal has been applied is retained until the subsequent writing signal is applied to the row of picture elements; formula (I) ##STR100## wherein R is an alkyl or alkoxy group having 1-18 carbon atoms; m is 0 or 1; R 1 is an alkyl group having 1 to 18 carbon atoms when m is 0 and is an alkyl or alkoxy group having 1-18 carbon atoms when m is 1.
Claim 25
Dependent Claim
17 words
A liquid crystal device according to claim 22, wherein R 1 is an optically active 2-methylbutyl group.
Claim 26
Dependent Claim
17 words
A liquid crystal device according to claim 22, wherein R 1 is an optically active 2-methylbutoxy group.
Claim 27
Dependent Claim
68 words
A liquid crystal device according to claim 22, wherein said writing signal applied to one row of picture element comprises a first signal of one polarity for orienting the liquid crystal compound or composition to the first stable state in a first phase, and a second signal of the other polarity for orienting the liquid crystal compound or composition to the second stable state in a second phase.
Claim 28
Dependent Claim
101 words
A liquid crystal device according to claim 22, wherein said writing signal applied to one row of picture elements comprises a first signal of one polarity for orienting the liquid crystal compound or composition to the first stable state, a second signal below a threshold of the liquid crystal compound or composition, a third signal of the other polarity for orienting the liquid crystal compound or composition to the second stable state and a fourth signal below the threshold; said first and second signals being applied in a first phase, said third and fourth signals being applied in a second phase.
Claim 29
Dependent Claim
16 words
A liquid crystal device according to claim 1, wherein said smectic phase is smectic A phase.
Claim 30
Dependent Claim
21 words
A liquid crystal device according to claim 1, wherein said smectic phase comprises smectic A phase and a chiral smectic phase.
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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) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |