EP0385688A2
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EP
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Ferroelectric liquid crystal composition and ferroelectric liquid crystal display device
Assignee: Panasonic Holdings Corp
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Filing: 1990-02-26
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Granted: —
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Expires: 2010-02-26
Abstract
Abstract Characteristics of a ferroelectric liquid crystal show that ionic impurities deteriorate its display quality to great extent. Thus the present invention provides a ferroelectric liquid crystal display device of good display quality without the deterioration of display characteristics as a result of trapping the ionic impurities effectively by adding an organic material which traps ions and which lowers conductivity of a liquid crystal layer thereto.
Inventors
- 👤 Hiroyuki Onishi
- 👤 Kazuhiro Johten
- 👤 Tsuyoshi Uemara
- 👤 Takao Sakurai
- 👤 Naoko Mikami
- 👤 Tadahiko Yokota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 19:25
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/582; C09K19/584
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
32 words
A ferroelectric liquid crystal composition wherein an organic material which traps ions or lowers conductivity of a liquid crystal is added to a liquid crystal mateirals having a ferroelectric liquid crystal phase.
Claim 2
Dependent Claim
32 words
A ferroelectric liquid crystal composition wherein an organic material which traps ions or lowers conductivity of a liquid crystal is added to a liquid crystal mateirals having a ferroelectric liquid crystal phase.
Claim 3
Dependent Claim
24 words
A ferroelectric liquid crystal composition according to claim 1, wherein said organic material is a chelate agent having low reactivity with the liquid crystal.
Claim 4
Dependent Claim
24 words
A ferroelectric liquid crystal composition according to claim 1, wherein said organic material is an electron donor having low reactivity with the liquid crystal.
Claim 5
Dependent Claim
17 words
A ferroelectric liquid crystal composition according to claim 1, wherein said organic material is a heterocycric compound.
Claim 6
Dependent Claim
16 words
A ferroelectric liquid crystal composition according to claim 1, wherein said organic material is alcohol derivatives.
Claim 7
Dependent Claim
23 words
A ferroelectric liquid crystal composition according to claim 1, wherein said organic material is a heterocycric compound including at least one nitrogen atom.
Claim 8
Dependent Claim
16 words
A ferroelectric liquid crystal composition according to claim 1, wherein said organic material is ether derivatives.
Claim 9
Dependent Claim
17 words
A ferroelectric liquid crystal composition according to claim 1, wherein said organic material is crown ether derivatives.
Claim 10
Dependent Claim
37 words
A ferroelectric liquid crystal composition according to claim 7, wherein said organic material is expressed in a general formula as R-(-O-(CH₂)n)m-O-R in which, R stands for an alkyl group, and n and m stand for natural numbers.
Claim 11
Dependent Claim
107 words
A ferroelectric liquid crystal composition according to claim 7, wherein said organic material is expressed in a general formula as in which, R stands for an alkyl group, l, m, and n stand for 0 and natural numbers, o and p stand for natural numbers, at least one of q, r, and s stands for natural numbers and the others stand for 0 and natural numbers, A and B stand for either single bonds or COO, OCO, CH₂O, and CHCH, and stand for ones of a benzene ring, a pyrimidine ring, a pyridadine ring, a pyradine ring, a pyridine ring, a cyclohexane ring, and a thiadiazole ring.
Claim 12
Dependent Claim
55 words
A ferroelectric liquid crystal display device comprising a pair of substrates on which an alignment treatment had been done and which have voltage applying means, and a ferroelectric liquid crystal between said substrates wherein an organic material which traps ions or lowers conductivity of the liquid crystal is added to a ferroelectric liquid crystal material.
Claim 13
Dependent Claim
55 words
A ferroelectric liquid crystal display device comprising a pair of substrates on which an alignment treatment had been done and which have voltage applying means, and a ferroelectric liquid crystal between said substrates wherein an organic material which traps ions or lowers conductivity of the liquid crystal is added to a ferroelectric liquid crystal material.
Claim 14
Dependent Claim
25 words
A ferroelectric liquid crystal display device according to claim 11, wherein said organic material is a chelate agent having low reactivity with the liquid crystal.
Claim 15
Dependent Claim
25 words
A ferroelectric liquid crystal display device according to claim 11, wherein said organic material is an electron donor having low reactivity with the liquid crystal.
Claim 16
Dependent Claim
18 words
A ferroelectric liquid crystal display device according to claim 11, wherein said organic material is a heterocycric compound.
Claim 17
Dependent Claim
17 words
A ferroelectric liquid crystal display device according to claim 11, wherein said organic material is alcohol derivatives.
Claim 18
Dependent Claim
24 words
A ferroelectric liquid crystal display device according to claim 11, wherein said organic material is a heterocycric compound including at least one nitrogen atom.
Claim 19
Dependent Claim
17 words
A ferroelectric liquid crystal display device according to claim 11, wherein said organic material is ether derivatives.
Claim 20
Dependent Claim
18 words
A ferroelectric liquid crystal display device according to claim 17, wherein said organic material is crown ether derivatives.
Claim 21
Dependent Claim
38 words
A ferroelectric liquid crystal display device according to claim 17, wherein said organic material is expressed in a general formula as F(-O-(CH₂)n)m-O-R in which, R stands for an alkyl group, and n and m stand for natural numbers.
Claim 22
Dependent Claim
108 words
A ferroelectric liquid crystal display device according to claim 17, wherein said organic material is expressed in a general formula as in which, R stands for an alkyl group, l, m, and n stand for 0 and natural numbers, o and p stand for natural numbers, at least one of q, r, and s stands for natural numbers and the others stand for 0 and natural numbers, A and B stand for either single bonds or COO, OCO, CH₂O, and CHCH, and stand for ones of a benzene ring, a pyrimidine ring, a pyridadine ring, a pyradine ring, a pyridine ring, a cyclohexane ring, and a thiadiazole ring.
Claim 23
Dependent Claim
58 words
A ferroelectric liquid crystal display device comprising a pair of substrates on which an alignment treatment has been done to form alignment layers thereon and which have voltage applying means, and a ferroelectric liquid crystal between said substrates wherein an organic material which traps ions or lowers conductivity of the liquid crystal is diffused in said alignment layers.
Claim 24
Dependent Claim
58 words
A ferroelectric liquid crystal display device comprising a pair of substrates on which an alignment treatment has been done to form alignment layers thereon and which have voltage applying means, and a ferroelectric liquid crystal between said substrates wherein an organic material which traps ions or lowers conductivity of the liquid crystal is diffused in said alignment layers.
Claim 25
Dependent Claim
25 words
A ferroelectric liquid crystal display device according to claim 21, wherein said organic material is a chelate agent having low reactivity with the liquid crystal.
Claim 26
Dependent Claim
25 words
A ferroelectric liquid crystal display device according to claim 21, wherein said organic material is an electron donor having low reactivity with the liquid crystal.
Claim 27
Dependent Claim
18 words
A ferroelectric liquid crystal display device according to claim 21, wherein said organic material is a heterocycric compound.
Claim 28
Dependent Claim
17 words
A ferroelectric liquid crystal display device according to claim 21, wherein said organic material is alcohol derivatives.
Claim 29
Dependent Claim
24 words
A ferroelectric liquid crystal display device according to claim 21, wherein said organic material is a heterocycric compound including at least one nitrogen atom,
Claim 30
Dependent Claim
17 words
A ferroelectric liquid crystal display device according to claim 21, wherein said organic material is ether derivatives.
Claim 31
Dependent Claim
18 words
A ferroelectric liquid crystal display device according to claim 27, wherein said organic material is crown ether derivatives.
Claim 32
Dependent Claim
38 words
A ferroelectric liquid crystal display device according to claim 27, wherein said organic material is expressed in a general formula as F(-O-(CH₂)n)m-O-R in which, R stands for an alkyl group, and n and m stand for natural numbers.
Claim 33
Dependent Claim
108 words
A ferroelectric liquid crystal display device according to claim 27, wherein said organic material is expressed in a general formula as in which, R stands for an alkyl group, l, m, and n stand for 0 and natural numbers, o and p stand for natural numbers, at least one of q, r, and s stands for natural numbers and the others stand for 0 and natural numbers, A and B stand for either single bonds or COO, OCO, CH₂O, and CHCH, and stand for ones of a benzene ring, a pyrimidine ring, a pyridadine ring, a pyradine ring, a pyridine ring, a cyclohexane ring, and a thiadiazole ring.
References Cited (Backward Citations)
No citation records indexed.
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