US4366080A
Expired / Lapsed
US
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Liquid crystal display element
Assignee: Toshiba Corp
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Filing: 1981-03-09
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Granted: 1982-12-28
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Expires: 2001-03-09
Abstract
Abstract A liquid crystal display element utilizing dynamic scattering uses a liquid crystal composition comprising a liquid crystal and charge transfer complex. The charge transfer complex contains nitro-substituted 9-fluorenones as the electron acceptor.
Inventors
- 👤 Kiyoshi Mizunoya
- 👤 Shoichi Matsumoto
- 👤 Hitoshi Tomii
- 👤 Masahiro Kawamoto
- 👤 Yuusuke Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:37
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/582; C09K19/584
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
A dynamic scattering type liquid crystal display element adapted to be actuated by D.C. voltage, comprising: a pair of electrode substrates forming a space therebetween, at least one of which is transparent; a liquid crystal composition filled in said space, said composition comprising a liquid crystal, and a charge transfer complex formed of an electron acceptor and electron donor, said electron acceptor being at least one nitro-substituted 9-fluorenone expressed by the general formula ##STR14## where m and n are each an integer of 0 to 4, and m plus n are an integer of 1 to 4.
Claim 2
Dependent Claim
97 words
A dynamic scattering type liquid crystal display element adapted to be actuated by D.C. voltage, comprising: a pair of electrode substrates forming a space therebetween, at least one of which is transparent; a liquid crystal composition filled in said space, said composition comprising a liquid crystal, and a charge transfer complex formed of an electron acceptor and electron donor, said electron acceptor being at least one nitro-substituted 9-fluorenone expressed by the general formula ##STR14## where m and n are each an integer of 0 to 4, and m plus n are an integer of 1 to 4.
Claim 3
Dependent Claim
10 words
The element according to claim 1, wherein m+n is 1.
Claim 4
Dependent Claim
12 words
The element according to claim 2, wherein the electron acceptor is 3-nitro-9-fluorenone.
Claim 5
Dependent Claim
10 words
The element according to claim 1, wherein m+n is 2.
Claim 6
Dependent Claim
15 words
The element according to claim 4, wherein the electron acceptor is 2,5-, 2,6- or 2,7-dinitro-9-fluorenone.
Claim 7
Dependent Claim
10 words
The element according to claim 1, wherein m+n is 3.
Claim 8
Dependent Claim
12 words
The element according to claim 6, wherein the electron acceptor is 2,4,7-trinitro-9-fluorenone.
Claim 9
Dependent Claim
10 words
The element according to claim 1, wherein m+n is 4.
Claim 10
Dependent Claim
12 words
The element according to claim 8, wherein the electron acceptor is 2,4,5,7-tetranitro-9-fluorenone.
Claim 11
Dependent Claim
30 words
The element according to claim 1, wherein the electron donor is selected from the group consisting of metallocene derivatives, phenylenediamine derivatives, diphenylamine derivatives, hydroquinone derivatives, tetrathiafulvalene derivatives and hydrazine derivatives.
Claim 12
Dependent Claim
12 words
The element according to claim 10, wherein the electron donor is dibutylferrocene.
Claim 13
Dependent Claim
30 words
The element according to any one of claims 1 to 11, wherein the charge transfer complex is present in an amount sufficient to produce dynamic scattering in the liquid crystal.
Claim 14
Dependent Claim
30 words
The element according to claim 12, wherein the charge transfer complex is present in an amount of 0.1 to 5% by weight based on the weight of the liquid crystal.
Claim 15
Dependent Claim
40 words
The element according to claim 12, wherein the liquid crystal comprises a phenyl ester of a cyclohexane carboxylic acid, a 4,4'-bis(cyclohexyl)biphenyl, a phenyl benzoate, a phenylcyclohexane, a biphenylcyclohexane, a biphenyl, an azoxybenzene, N-phenylbenzimine, an azobenzene, a stilbenene, or a 2-phenylpyrimidine.
Claim 16
Dependent Claim
16 words
The element according to claim 14, wherein the phenyl benzoate is a alkylbenzoic acid alkylphenyl ester.
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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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |