Patent US5510159A successfully refreshed from Google Patents.
US5510159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device
Assignee: Canon Inc
•
Filing: 1994-03-18
•
Granted: 1996-04-23
•
Expires: 2014-03-18
Abstract
Abstract A liquid crystal device is constituted by a pair of substrates each provided with a transparent electrode, and a liquid crystal disposed between the substrates; at least one of said pair of substrates having thereon an alignment film comprising (i) a polyimide including principally a recurring unit of the following structural formula (I): ##STR1## wherein R 11 denotes a tetravalent organic group, and R 12 and R 13 denote the same or different alkyl or perfluoroalkyl groups having 1-10 carbon atoms, and also at most 20 mol. % of a recurring monoamine unit of the following structural formula (II): ##STR2## wherein R 21 and R 22 denote the same or different alkyl or perfluoroalkyl groups having 1-10 carbon atoms, and X denotes an aromatic group, a heterocyclic group or a derivative group thereof; or (ii) a polyimide obtained through a reaction of at least two species of tetracarboxylic anhydrides of the following formula (III): ##STR3## wherein R 31 denotes a tetravalent organic group, and a diamine of the following formula (IV): ##STR4## wherein R 41 and R 42 denote the same or different alkyl or perfluoroalkyl groups having 1-10 carbon atoms.
Inventors
- 👤 Masanobu Asaoka
- 👤 Hideaki Takao
- 👤 Yukio Hanyu
- 👤 Makoto Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:51
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/105; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133723; C09; C09K; C09K2323/00; C09K2323/02; C09K2323/027; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
96 words
A liquid crystal device, comprising: a pair of substrates each provided with a transparent electrode, and a liquid crystal disposed in a chiral smectic phase between the substrates; at least one of said pair of substrates having thereon an alignment film comprising a polyimide obtained through a reaction of at least two species of tetracarboxylic anhydrides of the following formula (III): ##STR43## wherein R 31 denotes a tetravalent organic group, and a diamine of the following formula (IV): ##STR44## wherein R 41 and R 42 denote the same or different alkyl groups having 1-10 carbon atoms.
Claim 2
Dependent Claim
96 words
A liquid crystal device, comprising: a pair of substrates each provided with a transparent electrode, and a liquid crystal disposed in a chiral smectic phase between the substrates; at least one of said pair of substrates having thereon an alignment film comprising a polyimide obtained through a reaction of at least two species of tetracarboxylic anhydrides of the following formula (III): ##STR43## wherein R 31 denotes a tetravalent organic group, and a diamine of the following formula (IV): ##STR44## wherein R 41 and R 42 denote the same or different alkyl groups having 1-10 carbon atoms.
Claim 3
Dependent Claim
19 words
A device according to claim 1, wherein said liquid crystal in a chiral smectic phase has a non-helical structure.
Claim 4
Dependent Claim
15 words
A device according to claim 1, wherein the alignment film is disposed on both substrates.
Claim 5
Dependent Claim
24 words
A device according to claim 3, wherein the alignment films on both substrates have been subjected to uniaxial aligning treatment in mutually parallel directions.
Claim 6
Dependent Claim
13 words
A device according to claim 4, wherein the uniaxial aligning treatment is rubbing.
Claim 7
Dependent Claim
28 words
A device according to claim 3, wherein the alignment films on both substrates have been subjected to uniaxial aligning treatment in directions which are parallel and the same.
Claim 8
Dependent Claim
13 words
A device according to claim 6, wherein the uniaxial aligning treatment is rubbing.
Claim 9
Dependent Claim
27 words
A device according to claim 3, wherein the alignment films on both substrates have been subjected to uniaxial aligning treatment in directions which are parallel and opposite.
Claim 10
Dependent Claim
13 words
A device according to claim 8, wherein the uniaxial aligning treatment is rubbing.
Claim 11
Dependent Claim
27 words
A device according to claim 3, wherein the alignment films on both substrates have been subjected to uniaxial aligning treatment in directions which intersect with each other.
Claim 12
Dependent Claim
13 words
A device according to claim 10, wherein the uniaxial aligning treatment is rubbing.
Claim 13
Dependent Claim
11 words
A device according to claim 1, wherein R 31 denotes ##STR45##
Claim 14
Dependent Claim
30 words
A device according to claim 1, wherein said chiral smectic liquid crystal is a liquid crystal which successively assumes isotropic phase, cholesteric phase and smectic A phase on temperature decrease.
Claim 15
Dependent Claim
20 words
A device according to claim 1, wherein R 41 and R 42 denote an alkyl group having 1-5 carbon atoms.
Claim 16
Dependent Claim
112 words
A liquid crystal apparatus, including a liquid crystal device, comprising: a pair of substrates each provided with a transparent electrode, and a liquid crystal disposed in a chiral smectic phase between the substrates; and voltage application means for applying voltages to the transparent electrodes: at least one of said pair of substrates having thereon an alignment film comprising a polyimide obtained through a reaction of at least two species of tetracarboxylic anhydrides of the following formula (III): ##STR46## wherein R 31 denotes a tetravalent organic group, and a diamine of the following formula (IV): ##STR47## wherein R 41 and R 42 denote the same or different alkyl groups having 1-10 carbon atoms.
Claim 17
Dependent Claim
112 words
A liquid crystal apparatus, including a liquid crystal device, comprising: a pair of substrates each provided with a transparent electrode, and a liquid crystal disposed in a chiral smectic phase between the substrates; and voltage application means for applying voltages to the transparent electrodes: at least one of said pair of substrates having thereon an alignment film comprising a polyimide obtained through a reaction of at least two species of tetracarboxylic anhydrides of the following formula (III): ##STR46## wherein R 31 denotes a tetravalent organic group, and a diamine of the following formula (IV): ##STR47## wherein R 41 and R 42 denote the same or different alkyl groups having 1-10 carbon atoms.
References Cited (Backward Citations)
US4367924A
Cited
US4655561A
Cited
US4561726A
Cited
US4883344A
Cited
EP0249881A1
Cited
EP0282254A2
Cited
EP0337355A2
Cited
EP0400635A2
Cited
EP0415447A1
Cited
US5129727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-23 | 1999-10-23 | 2000-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-23 | 2003-10-23 | 2004-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-23 | 2007-10-23 | 2008-04-23 | $7700.00 | Window Closed / Lapsed |