US4547309A
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Storage-type liquid crystal composition
Assignee: Fujitsu Ltd
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Filing: 1983-12-06
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Granted: 1985-10-15
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Expires: 2003-12-06
Abstract
Abstract A storage type liquid crystal composition in which a nematic-cholesteric mesophase transition is utilized and the anisotropy of the dielectric constant is positive and an X-Y dot-matrix-type storage-type liquid-crystal display element comprising the composition. The present liquid crystal composition has low driving voltage and long memory effect. This composition comprises a cyclohexane-type liquid crystal, an azoxy-type liquid crystal, and a compensated cholesteric liquid crystal and/or cholesteryl oleate.
Inventors
- 👤 Akihiro Mochizuki
- 👤 Kasumi Ikegami
- 👤 Toshiaki Narusawa
- 👤 Hirofumi Okuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:27
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/50
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
115 words
A storage-type liquid crystal composition in which a nematic-cholesteric mixture liquid crystal exhibiting a positive anisotropy of the dielectric constant is used, said composition comprising a cyclohexane-type liquid crystal of formula I, at least one azoxy type liquid crystal of formula IIa and IIb, and a compensated cholesteric liquid crystal of cholesteryl myristrate and chlosteryl chloride of formulae IIIa and IIIb, respectively: ##STR45## where R 1 represents a straight-chain alkyl or alkoxy group having one to seven carbon atoms, ##STR46## where R 2 represents an alkyl or alkoxy group having one to seven carbon atoms and R 3 represents a straight-chain alkyl or alkoxy having one to seven carbon atoms or a cyano group, ##STR47##
Claim 2
Dependent Claim
115 words
A storage-type liquid crystal composition in which a nematic-cholesteric mixture liquid crystal exhibiting a positive anisotropy of the dielectric constant is used, said composition comprising a cyclohexane-type liquid crystal of formula I, at least one azoxy type liquid crystal of formula IIa and IIb, and a compensated cholesteric liquid crystal of cholesteryl myristrate and chlosteryl chloride of formulae IIIa and IIIb, respectively: ##STR45## where R 1 represents a straight-chain alkyl or alkoxy group having one to seven carbon atoms, ##STR46## where R 2 represents an alkyl or alkoxy group having one to seven carbon atoms and R 3 represents a straight-chain alkyl or alkoxy having one to seven carbon atoms or a cyano group, ##STR47##
Claim 3
Dependent Claim
59 words
A storage-type liquid crystal composition as claimed in claim 1, wherein the cyclohexane-type liquid crystal is used in the range of 30% to 70% by weight, the azoxy type liquid crystal is used in the range of 10% to 40% by weight, and the compensated cholesteric liquid crystal is used in the range of 5% to 15% by weight.
Claim 4
Dependent Claim
27 words
A storage-type liquid crystal composition as claimed in claim 1, wherein the ratio of cholesteryl myristate to cholesteryl chloride is in the range of 1.00:1.00 to 1.00:3.00.
Claim 5
Dependent Claim
27 words
A storage-type liquid crystal composition as claimed in claim 2, wherein the ratio of cholesteryl myristate to cholesteryl chloride is in the range of 1.00:1.00 to 1.00:3.00.
Claim 6
Dependent Claim
126 words
An X-Y dot-matrix-type storage-type liquid-crystal-display element comprising a storage type liquid crystal composition in which a nematic-cholesteric mixture liquid crystal exhibiting a positive anisotropy of dielectric constant is used, said storage-type liquid crystal composition comprising a cyclohexane type liquid crystal of formula I, at least one azoxy type liquid crystal of formulas IIa and IIb, and a compensated cholesteric liquid crystal of cholesteryl myristate and cholesteryl chloride of formulae IIIa and IIIb, respectively: ##STR48## where R 1 represents a straight-chain alkyl or alkoxy group having one to seven carbon atoms, ##STR49## where R 2 represents an alkyl or alkoxy group having one to seven carbon atoms and R 3 represents a straight-chain alkyl or alkoxy having one to seven carbon atoms or a cyano group, ##STR50##
Claim 7
Dependent Claim
126 words
An X-Y dot-matrix-type storage-type liquid-crystal-display element comprising a storage type liquid crystal composition in which a nematic-cholesteric mixture liquid crystal exhibiting a positive anisotropy of dielectric constant is used, said storage-type liquid crystal composition comprising a cyclohexane type liquid crystal of formula I, at least one azoxy type liquid crystal of formulas IIa and IIb, and a compensated cholesteric liquid crystal of cholesteryl myristate and cholesteryl chloride of formulae IIIa and IIIb, respectively: ##STR48## where R 1 represents a straight-chain alkyl or alkoxy group having one to seven carbon atoms, ##STR49## where R 2 represents an alkyl or alkoxy group having one to seven carbon atoms and R 3 represents a straight-chain alkyl or alkoxy having one to seven carbon atoms or a cyano group, ##STR50##
Claim 8
Dependent Claim
59 words
An X-Y dot-matrix-type storage-type liquid-crystal-display element as claimed in claim 5, wherein the cyclohexane-type liquid crystals is used in the range of 30% to 70% by weight, the azoxy-type liquid crystal is used in the range of 10% to 40% by weight, and the compensated cholesteric liquid crystal is used in the range of 5% to 15% by weight.
Claim 9
Dependent Claim
29 words
An X-Y dot-matrix-type storage-type liquid-crystal-display element as claimed in claim 5, wherein the ratio of said cholesteryl myristate to cholesteryl chloride is in the range of 1.00:1.00 to 1.00:3.00.
Claim 10
Dependent Claim
29 words
An X-Y dot-matrix-type storage-type liquid-crystal-display element as claimed in claim 6, wherein the ratio of said cholesteryl myristate to cholesteryl chloride is in the range of 1.00:1.00 to 1.00:3.00.
Claim 11
Dependent Claim
109 words
A storage-type liquid crystal composition in which a nematic-cholesteric mixture liquid crystal exhibiting a positive anisotropy of the dielectric constant is used, said composition comprising a cyclohexane-type liquid crystal of formula I, at least one azoxy type liquid crystal of formulas IIa and IIb, and a cholesteryl oleate of Formula III: ##STR51## where R 1 represents a straight-chain alkyl or alkoxy group having one to seven carbon atoms, ##STR52## where R 2 represents an alkyl or alkoxy group having one to seven carbon atoms and R 3 represents a straight-chain alkyl or alkoxy having one to seven carbon atoms or a cyano group, CH.sub.3 (CH.sub.2).sub.7 CH═CH(CH.sub.2).sub.7 COOC.sub.27 H.sub.45 (III).
Claim 12
Dependent Claim
109 words
A storage-type liquid crystal composition in which a nematic-cholesteric mixture liquid crystal exhibiting a positive anisotropy of the dielectric constant is used, said composition comprising a cyclohexane-type liquid crystal of formula I, at least one azoxy type liquid crystal of formulas IIa and IIb, and a cholesteryl oleate of Formula III: ##STR51## where R 1 represents a straight-chain alkyl or alkoxy group having one to seven carbon atoms, ##STR52## where R 2 represents an alkyl or alkoxy group having one to seven carbon atoms and R 3 represents a straight-chain alkyl or alkoxy having one to seven carbon atoms or a cyano group, CH.sub.3 (CH.sub.2).sub.7 CH═CH(CH.sub.2).sub.7 COOC.sub.27 H.sub.45 (III).
Claim 13
Dependent Claim
56 words
A storage-type liquid crystal composition as claimed in claim 8, wherein the cyclohexane-type liquid crystal is used in the range of 30% to 70% by weight, the azoxy-type liquid crystal is used in the range of 10% to 40% by weight, and the cholesteryl oleate is used in the range of 5% to 8.0% by weight.
Claim 14
Dependent Claim
118 words
An X-Y dot-matrix storage-type liquid-crystal-display element comprising a storage type liquid crystal composition in which a nematic-cholesteric mixture liquid crystal exhibiting a positive anisotropy of dielectric constant is used, said storage-type liquid crystal composition comprising a cyclohexane type liquid crystal of formula I, at least one azoxy type liquid crystal of formulas IIa and IIb and a cholesteryl oleate of formula III; ##STR53## where R 1 represents a straight-chain alkyl or alkoxy group having one to seven carbon atoms, ##STR54## where R 2 represents an alkyl group having one to seven carbon atoms and R 3 represents a straight-chain alkyl or alkoxy having one to seven carbon atoms or a cyano group, CH.sub.3 (CH.sub.2).sub.7 CH═CH(CH.sub.2).sub.7 COOC.sub.27 H.sub.45 (IV).
Claim 15
Dependent Claim
118 words
An X-Y dot-matrix storage-type liquid-crystal-display element comprising a storage type liquid crystal composition in which a nematic-cholesteric mixture liquid crystal exhibiting a positive anisotropy of dielectric constant is used, said storage-type liquid crystal composition comprising a cyclohexane type liquid crystal of formula I, at least one azoxy type liquid crystal of formulas IIa and IIb and a cholesteryl oleate of formula III; ##STR53## where R 1 represents a straight-chain alkyl or alkoxy group having one to seven carbon atoms, ##STR54## where R 2 represents an alkyl group having one to seven carbon atoms and R 3 represents a straight-chain alkyl or alkoxy having one to seven carbon atoms or a cyano group, CH.sub.3 (CH.sub.2).sub.7 CH═CH(CH.sub.2).sub.7 COOC.sub.27 H.sub.45 (IV).
Claim 16
Dependent Claim
26 words
The composition of claim 9 or 11, comprising a compensated cholesteric liquid crystal of cholesteryl myristate and cholestery chloride of formulas IVa and IVb, respectively: ##STR55##
Claim 17
Dependent Claim
28 words
The composition of claim 1, 5, 9 or 11, comprising a biphenyl compound of the formula ##STR56## wherein R is an alkyl having one to seven carbon atoms.
Claim 18
Dependent Claim
27 words
A storage-type liquid-crystal display panel utilizing the composition of claim 1, 5, 9 or 11, which can be driven by a voltage of less than 7.0 V.
Claim 19
Dependent Claim
22 words
The panel of claim 14, having the properties of having been subjected to a vertical orientation treatment with a silane coupling agent.
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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) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |