EP0259822A1
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EP
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Liquid crystal display device
Assignee: Konica Minolta Inc
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Filing: 1987-09-08
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Granted: —
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Expires: 2007-09-08
Abstract
Abstract There is disclosed a liquid crystal display device which comprises liquid crystal materials (c) aligned between a pair of substrates (1, 2) each having an alignment layer, respectively, characterized in that the following conditions (a) to (c) are satisfied: (a) the twist angle (α) of the liquid crystal molecules aligned between the above pair of substrates is 200° to 300°; (b) the following relationship formula (1) is valid between the spontaneous twist pitch Ps of the liquid crystal molecules and the regulated twist pitch Pc of the liquid crystal molecules when the arrangement of liquid crystal molecules is compulsorily regulated by the alignment layers: 0 ≦ (Pc - Ps)/Pc ≦ 0.3 ....... (1); and (c) the following relationship formula (2) is valid between the splay elastic constant k₁₁ and the bend elastic constant k₃₃ of the above liquid crystal materials: 0.9 < k₃₃/k₁₁ < 1.5 ....... (2).
Inventors
- 👤 Kazuo Asano
- 👤 Kazuo Arai
- 👤 Shinichi Nishi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 16:16
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/02; C09K19/0208; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/1396; G02F1/1397
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
139 words
A liquid crystal display device comprising liquid crystal materials aligned between a pair of substrates each having an alignment layer, respectively, characterized in that the following conditions (a) to (c) are satisfied: (a) the twist angle of the liquid crystal molecules aligned between the above pair of substrates is 200° to 300°; (b) the following relationship formula (1) is valid between the spontaneous twist pitch Ps of the liquid crystal molecules and the regulated twist pitch Pc of the liquid crystal molecules when the arrangement of liquid crystal molecules is compulsorily regulated by the alignment layers: 0 ≦ (Pc - Ps)/Pc ≦ 0.3 ....... (1); and (c) the following relationship formula (2) is valid between the splay elastic constant k₁₁ and the bend elastic constant k₃₃ of the above liquid crystal materials: 0.9 < k₃₃/k₁₁ < 1.5 ....... (2).
Claim 2
Dependent Claim
139 words
A liquid crystal display device comprising liquid crystal materials aligned between a pair of substrates each having an alignment layer, respectively, characterized in that the following conditions (a) to (c) are satisfied: (a) the twist angle of the liquid crystal molecules aligned between the above pair of substrates is 200° to 300°; (b) the following relationship formula (1) is valid between the spontaneous twist pitch Ps of the liquid crystal molecules and the regulated twist pitch Pc of the liquid crystal molecules when the arrangement of liquid crystal molecules is compulsorily regulated by the alignment layers: 0 ≦ (Pc - Ps)/Pc ≦ 0.3 ....... (1); and (c) the following relationship formula (2) is valid between the splay elastic constant k₁₁ and the bend elastic constant k₃₃ of the above liquid crystal materials: 0.9 < k₃₃/k₁₁ < 1.5 ....... (2).
Claim 3
Dependent Claim
47 words
A liquid crystal display device according to Claim 1, wherein the angle created between the director direction of the liquid crystal molecules contacting at least one of the surfaces of the above alignment layers and the substrate surface having said alignment layer is not less than 5°.
Claim 4
Dependent Claim
47 words
A liquid crystal display device according to Claim 1, wherein Δε/ε┴, the ratio of the dielectric constant anisotropy Δε of the liquid crystal materials to the dielectric constant ε┴ in the direction perpendicular to the longer axis direction of the liquid crystal molecule is 1.8 or higher.
Claim 5
Dependent Claim
35 words
A liquid crystal display device according to Claim 1, wherein said liquid crystal materials comprise at least one kind of a nematic liquid crystal materials and at least one kind of an optically active substance.
Claim 6
Dependent Claim
30 words
A liquid crystal display device according to Claim 4, wherein the amount of the optically active substance added to the nematic liquid crystal is 1.5 % by weight or less.
Claim 7
Dependent Claim
36 words
A liquid crystal display device according to Claim 1, wherein the transition temperature T NI from the nematic liquid crystal phase to an isotropic liquid phase in said liquid crystal materials is 90 °C or higher.
Claim 8
Dependent Claim
25 words
A liquid crystal display device according to Claim 1, wherein said liquid crystal materials have a refractive index anisotropy Δn which is 0.12 or more.
Claim 9
Dependent Claim
30 words
A liquid crystal display device according to Claim 1, wherein a viscosity at a temperature of 20 °C of said liquid crystal materials should preferably be 30 cp or lower.
Claim 10
Dependent Claim
40 words
A liquid crystal display device according to Claim 1, wherein said liquid crystal materials satisfies the following relationship formula (3) between the twisting elastic constant k₂₂ and the bend elastic constant k₃₃ thereof: 1.8 < k₃₃/k₂₂ < 2.5 ....... (3).
Claim 11
Dependent Claim
39 words
A liquid crystal display device according to Claim 1, wherein the product Δn.d of a refractive index anisotropy Δn of said liquid crystal materials and a thickness d (µm) of a liquid crystal layer C is 0.4 to 1.5.
Claim 12
Dependent Claim
41 words
A liquid crystal display device according to Claim 1, wherein deviated angles β and γ is set at values so that the value of the sum of these angles β + γ is in the range of 90° ± within 20°.
Claim 13
Dependent Claim
42 words
A liquid crystal display device according to Claim 1, wherein deviated angles β and γ is set at values so that the value of the sum of these angles β + γ is in the range of - 90° ± within 20°.
Claim 14
Dependent Claim
41 words
A liquid crystal display device according to Claim 1, wherein deviated angles β and γ is set at values so that the value of the sum of these angles β + γ is in the range of 0° ± within 20°.
Claim 15
Dependent Claim
25 words
A liquid crystal display device according to Claim 1, wherein a deviated angle β is set at a value of (360° α)/2 ± within 15°.
Claim 16
Dependent Claim
25 words
A liquid crystal display device according to Claim 1, wherein a deviated angle B is set at a value of -( α-180°)/2 ± within 15°.
Claim 17
Dependent Claim
38 words
A liquid crystal display device according to Claim 1, wherein an angle ϑ created between an aligning treatment direction P of an upper substrate and an aligning treatment direction Q in a lower substrate is 20° to 120°.
Claim 18
Dependent Claim
43 words
A liquid crystal display device according to Claim 1, wherein said device satisfies the following relationship formula: [(α/360) - 0.25] < d/Ps < [(α/360) + 0.30] wherein d is a thickness of a liquid crystal layer and Ps is a spontaneous twist pitch.
References Cited (Backward Citations)
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