EP0194659A2
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EP
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Ferroelectric chiral smectic liquid crystal composition and light switching element
Assignee: JNC Corp
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Filing: 1986-03-12
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Granted: —
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Expires: 2006-03-12
Abstract
Abstract A ferroelectric chiral smectic liquid crystal composition containing two kinds of chiral smectic liquid crystal compound is provided. One of the said compounds shows twist sense of helix of right-handed and the other show twist sense of helix of left-handed and the direction of spontaneous polarization of component chiral smectic liquid crystal compounds is the same. This composition provides a liquid crystal display element which shows very quick response.
Inventors
- 👤 Kenji Furukawa
- 👤 Kanetsugu Terashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 00:33
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/46; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/22; C09K19/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
A ferroelectric chiral smectic liquid crystal composition containing two kinds of chiral smectic liquid crystal compound in one of which twist sense of helix is right-handed and in the other twist sense of helix is left-handed, an improvement which is characterized by that the direction of spontaneous polarization of component chiral smectic liquid crystal compounds is same.
Claim 2
Dependent Claim
57 words
A ferroelectric chiral smectic liquid crystal composition containing two kinds of chiral smectic liquid crystal compound in one of which twist sense of helix is right-handed and in the other twist sense of helix is left-handed, an improvement which is characterized by that the direction of spontaneous polarization of component chiral smectic liquid crystal compounds is same.
Claim 3
Dependent Claim
77 words
A ferroelectric chiral smectic liquid crystal composition as claimed in claim 1, wherein the chiral smectic liquid crystal compound is an optical active compound represented by a general formula wherein m and n represent, respectively integer of 1 or 2 ; R represents an alkyl or alkoxy group having 1 -18 carbon atoms; Y represents an alkyl, alkoxy, alkoxycarbonyl, alkanoyl or alkanoyloxy group, having asymmetric carbon atom; and X represents -OCH 2 - or a single bond.
Claim 4
Dependent Claim
108 words
A ferroelectric chiral smectic liquid crystal composition as claimed in claim 2 wherein the chiral smectic liquid crystal compound in which twist sense of helix is right-handed, is an optically active compound in which the absolute configuration in the side chain Y of the formula (1) is sinister and an asymmetric carbon atom is on an even position counting from the carbon of benzene ring connected with Y or an optically active compound in which the absolute configuration in the side chain Y of this formula is rectus and an asymmetric carbon atom is on the odd position counting from the carbon of benzene ring connected with Y.
Claim 5
Dependent Claim
108 words
A ferroelectric chiral smectic liquid crystal composition as claimed in claim 2 wherein the chiral smectic liquid crystal compound in which twist sense of helix is left-handed, is an optically active compound in which the absolute configuration in the side chain Y of the formula (1) is sinister and an asymmetric carbon atom is on the odd position counting from the carbon of benzene ring connected with Y or an optically active compound in which the absolute configuration in the side chain Y of this formula is rectus and an asymmetric carbon atom is on the even position counting from the carbon of benzene ring connected with Y.
Claim 6
Dependent Claim
96 words
A ferroelectric chiral smectic liquid crystal composition as claimed in claim 2 wherein chiral smectic liquid crystal compound in which twist sense of helix is right-handed is an optically active compound in which a side chain Y of the formula (1) is and its absolute configuration is sinister and chiral smectic liquid crystal compound in which twist sense of helix is left-handed, is an optically active compound in which a side chain Y of the formula (1) is and its absolute configuration is sinister or a side chain Y is and its absolute configuration is rectus.
Claim 7
Dependent Claim
111 words
A ferroelectric chiral smectic liquid crystal composition as claimed in claim 2 wherein a chiral smectic liquid crystal compound in which twist sense of helix is right-handed is an optically active compound in which a side chain Y of the formula (1) is sinister in the absolute configuration of optical active group and having a formula or Y is rectus in absolute configuration and having a formula and a chiral smectic liquid crystal compound in which twist sense of helix is left-handed, is an optically active compound in which a side chain Y of the formula (1) is sinister in absolute configuration of optically active group and having a formula of
Claim 8
Dependent Claim
72 words
A light switching element which utilizes a ferroelectric chiral smectic liquid crystal composition which is characterized in that the direction of spontaneous polarization of component chiral smectic liquid crystal compounds is the same in a ferroelectric chiral smectic liquid crystal composition consisting of two kinds of chiral smectic liquid crystal compound in one of which twist sense of helix is right-handed and in the other of twist sense of helix is left-handed.
Claim 9
Dependent Claim
72 words
A light switching element which utilizes a ferroelectric chiral smectic liquid crystal composition which is characterized in that the direction of spontaneous polarization of component chiral smectic liquid crystal compounds is the same in a ferroelectric chiral smectic liquid crystal composition consisting of two kinds of chiral smectic liquid crystal compound in one of which twist sense of helix is right-handed and in the other of twist sense of helix is left-handed.
References Cited (Backward Citations)
EP0136725A2
Cited
JPS6090290A
Cited
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