EP0173581A2
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EP
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A phase transition-type liquid crystal composition
Assignee: Fujitsu Ltd
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Filing: 1985-08-30
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Granted: —
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Expires: 2005-08-30
Abstract
Abstract A phase transition-type liquid crystal composition including a mixture of ester-type liquid crystal compound and chiral nematic liquid crystal compound having added thereto at least one of ethane-type liquid crystal compound and bicyclohexane-type liquid crystal compound. This liquid crystal composition exhibitis an extended with (AV) of voltage hysteresis and therefore a stabilized homoetropic (H') state, when its voltage hysteresis curve is plotted. The liquid crystal display devices or elements using this composition have a fast response characteristic and enable a large scale or area. display and an input operation using keyboards.
Inventors
- 👤 Akihiro Mochizuki
- 👤 Kazumasa Saito
- 👤 Tsuneo Watanuki
- 👤 Kasumi Ikegami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 00:52
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/46; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13731
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
35 words
A liquid crystal composition comprising a mixture of an ester-type liquid crystal compound and chiral nematic liquid crystal compound having added thereto at least one of ethane-type liquid crystal compound and bicyclohexane-type liquid crystal compound.
Claim 2
Dependent Claim
35 words
A liquid crystal composition comprising a mixture of an ester-type liquid crystal compound and chiral nematic liquid crystal compound having added thereto at least one of ethane-type liquid crystal compound and bicyclohexane-type liquid crystal compound.
Claim 3
Dependent Claim
217 words
A liquid crystal composition as in claim 1 in which the ethane-type liquid crystal compound has the formula: in which R 1 , R 3 , R 5 , and R 7 may be the same or different and each represents an alkyl group of 2 to 7 carbon atoms, R 2 , R 4 , R 6 , and R 8 may be the same or different and each represents an alkyl group of 2 to 7 carbon atoms, an alkoxv group of 1 to 6 carbon atoms, a fluorine atom, a bromine atom, or a cyano group, R represents an alkyl group of 2 to 7 carbon atoms, a fluorine atom or a bromine atom, R 9 ' R 11 ' R 13 ' R 15 ' R17 ' R 19 , and R21 may be the same or different and each represents an alkyl group of 2 to 7 carbon atoms or an alkoxy group of 1 to 6 carbon atoms, and R 10 ' R 12 , R 14 , R 16 , R 18 , R 20 , and R 22 may be the same or different and each represents an alkyl group of 2 to 7 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom, or a cyano group.
Claim 4
Dependent Claim
52 words
A liquid crystal composition as in claim 1 or claim 2 in which the bicyclohexane-type liquid crystal compound has the formula: in which R 23 represents an alkyl group of 2 to 7 carbon atoms and R 24 represents an alkyl group of 2 to 7 carbon atoms or a cyano group.
Claim 5
Dependent Claim
41 words
A liquid crystal composition as in any one of claims 1 to 3 in which the ester-type liquid crystal compound has the formula: in which an oxygen atom of the central group -COO- may be optionally substituted with a sulfur atom.
Claim 6
Dependent Claim
33 words
A liquid crystal composition as in any one of claims 1 to 4 in which the chiral nematic liquid crystal compound has the formula: in which C * means an asymmetric carbon atom.
Claim 7
Dependent Claim
18 words
A liquid crystal composition as in any of claims 1 to 5, which exhibits a positive dielectric anisotropy.
Claim 8
Dependent Claim
20 words
A liquid crystal composition as in any of claims 1 to 6, which is a cholesteric-nematic phase transition-type liquid crystal.
Claim 9
Dependent Claim
51 words
A liquid crystal composition as in any one of claims 1 to 7, in which the ethane-type liquid crystal compound is used in an amount of 10% to 70% by weight based on the total weight of the liquid crystal composition, preferably in an amount of 10 to 40% by weight.
Claim 10
Dependent Claim
51 words
A liquid crystal composition as in any one of claims 1 to 8 in which the bicyclohexane-type liquid crystal compound is used in an amount of 10% to 60% by weight based on the total weight of the liquid crystal composition, preferably in an amount of 20 to 40% by weight.
Claim 11
Dependent Claim
52 words
A liquid crystal composition as in any one of claims 1 to 9 in which the chiral nematic liquid crystal compound is used in an amount of 8% to 40% by weight based on the total weight of the liquid crystal composition, preferably in an amount of 10 to 30% by weight.
Claim 12
Dependent Claim
51 words
A liquid crystal composition as in any one of claims 1 to 10 in which the ester-type liquid crystal compound is used in an amount of 15% to 85% by weight based on the total weight of the liquid crystal composition, preferably in an amount of 20 to 55% by weight.
Claim 13
Dependent Claim
24 words
A liquid crystal composition as in any one of claims 1 to 11 in which other types of liquid crystal compounds are additionally included.
Claim 14
Dependent Claim
36 words
A liquid crystal composition as in claim 12 which includes other types of liquid crystal compounds selected from the group consisting of biphenyl-type, dioxane-type, pyrimidine-type, cyclohexane-benzene type, terphenyl-type and cyclohexane-biphenyl-type liquid crystal compounds, and mixtures thereof.
Claim 15
Dependent Claim
139 words
A liquid crystal composition as in claim 12 or claim 13 which includes one or more compounds selected from a biphenyl-type liquid crystal compound in an amount of several percent to 20% by weight, suitably from 5 or 10% to 20% by weight, a dioxane-type liquid crystal compound in an amount of several percent to 20% by weight, preferably 3 to 15% by weight, a pyrimidine-type liquid crystal compound in an amount of up to 15% by weight, preferably up to 5 or 10% by weight, a cyclohexane-type liquid crystal compound in an amount of several percent to 20% by weight, suitably from 3 or.5% to 20% by weight, and terphenyl-and/or cyclohexane biphenyl-type liquid crystal compounds in a combined amount of up to 10% by weight, all percentages being based on the total weight of the liquid crystal composition.
References Cited (Backward Citations)
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