US5620630A
Expired / Lapsed
US
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Polymer dispersed liquid crystal display device, and a method for producing the same
Assignee: Sharp Corp
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Filing: 1995-06-01
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Granted: 1997-04-15
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Expires: 2015-06-01
Abstract
Abstract A liquid crystal display device according to the present invention includes a pair of electrode substrates and a polymer dispersed liquid crystal complex film interposed between the pair of substrates. The polymer dispersed liquid crystal complex film includes a liquid crystal composition and a polymer resin composition. It is ensured that a value ΔT is 25° C. or less, and a glass transition temperature T g of the polymer resin composition is 60° C. or more, the value ΔT being defined as a difference between a phase transition temperature T CI of the liquid crystal composition between a liquid crystal phase and an isotropic liquid phase thereof and a phase transition temperature T matrix of the polymer dispersed liquid crystal complex film.
Inventors
- 👤 Noriaki Onishi
- 👤 Nobuaki Yamada
- 👤 Masahiko Kondo
- 👤 Nobukazu Nagae
- 👤 Toshiyuki Hirai
- 👤 Shuichi Kohzaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:39
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1334; C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/542; C09K19/544; C09K2323/00; C09K2323/03; C09K2323/031; C09K2323/033
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
A method for producing a polymer dispersed liquid crystal complex film including the steps of: a step for preparing a mixture of a polymerizable material and a liquid crystal material, wherein the polymerizable material includes a monofunctional monomer and at least one of a multi-functional monomer and a multi-functional oligomer mixed at a ratio in the range of 93:7 to 40:60; and a phase separation step for processing the mixture into a polymer dispersed liquid crystal complex film by a phase separation conducted through polymerization, the polymer dispersed liquid crystal complex film consisting of a liquid crystal composition and a polymer resin composition, wherein a value ΔT is 25° C. or less, and a glass transition temperature T g of the polymer resin composition is 60° C. or more, the value ΔT being defined as a difference between a phase transition temperature T matrix of the polymer dispersed liquid crystal complex film and a phase transition temperature T CI of the liquid crystal composition between a liquid crystal phase and an isotropic liquid phase thereof.
Claim 2
Independent Claim
175 words
A method for producing a polymer dispersed liquid crystal complex film including the steps of: a step for preparing a mixture of a polymerizable material and a liquid crystal material, wherein the polymerizable material includes a monofunctional monomer and at least one of a multi-functional monomer and a multi-functional oligomer mixed at a ratio in the range of 93:7 to 40:60; and a phase separation step for processing the mixture into a polymer dispersed liquid crystal complex film by a phase separation conducted through polymerization, the polymer dispersed liquid crystal complex film consisting of a liquid crystal composition and a polymer resin composition, wherein a value ΔT is 25° C. or less, and a glass transition temperature T g of the polymer resin composition is 60° C. or more, the value ΔT being defined as a difference between a phase transition temperature T matrix of the polymer dispersed liquid crystal complex film and a phase transition temperature T CI of the liquid crystal composition between a liquid crystal phase and an isotropic liquid phase thereof.
Claim 3
Independent Claim
186 words
A method for producing a polymer dispersed liquid crystal display device including the steps of: a step for preparing a mixture of a polymerizable material and a liquid crystal material, wherein the polymerizable material includes a monofunctional monomer and at least one of a multi-functional monomer and a multi-functional oligomer mixed at a ratio in the range of 93:7 to 40:60; and a phase separation step for processing the mixture by a phase separation conducted through polymerization into a polymer dispersed liquid crystal complex film as a display medium interposed between a pair of electrode substrates, the polymer dispersed liquid crystal complex film consisting of a liquid crystal composition and a polymer resin composition, wherein a value ΔT is 25° C. or less, and a glass transition temperature T g of the polymer resin composition is 60° C. or more, the value ΔT being defined as a difference between a phase transition temperature T matrix of the polymer dispersed liquid crystal complex film and a phase transition temperature T CI of the liquid crystal composition between a liquid crystal phase and an isotropic liquid phase thereof.
Claim 4
Independent Claim
186 words
A method for producing a polymer dispersed liquid crystal display device including the steps of: a step for preparing a mixture of a polymerizable material and a liquid crystal material, wherein the polymerizable material includes a monofunctional monomer and at least one of a multi-functional monomer and a multi-functional oligomer mixed at a ratio in the range of 93:7 to 40:60; and a phase separation step for processing the mixture by a phase separation conducted through polymerization into a polymer dispersed liquid crystal complex film as a display medium interposed between a pair of electrode substrates, the polymer dispersed liquid crystal complex film consisting of a liquid crystal composition and a polymer resin composition, wherein a value ΔT is 25° C. or less, and a glass transition temperature T g of the polymer resin composition is 60° C. or more, the value ΔT being defined as a difference between a phase transition temperature T matrix of the polymer dispersed liquid crystal complex film and a phase transition temperature T CI of the liquid crystal composition between a liquid crystal phase and an isotropic liquid phase thereof.
Claim 5
Dependent Claim
60 words
A method for producing a liquid crystal display device according to claim 2, wherein the phase separation step includes a first phase separation step for phase-separating the mixture through polymerization, and a second phase separation step for further phase-separating the mixture through polymerization, the second phase separation step being conducted at a lower temperature than the first phase separation step.
Claim 6
Dependent Claim
45 words
A method for producing a liquid crystal display device according to claim 2, wherein the polymerization is conducted by irradiating the mixture with light, the light having a distribution of intensities ranging from a first intensity to a second intensity lower than the first intensity.
Claim 7
Dependent Claim
50 words
A method for producing a liquid crystal display device according to claim 4, wherein the light having a distribution of intensities ranging from a first intensity to a second intensity lower than the first intensity is obtained through means for lowering the intensity of the light at a pixel region.
Claim 8
Dependent Claim
48 words
A method for producing a liquid crystal display device according to claim 2, wherein the liquid crystal composition obtained through the phase separation step has a positive anisotropy of dielectric constant, and includes at least one of a fluorine-containing liquid crystal compound and a chlorine-containing liquid crystal compound.
Claim 9
Dependent Claim
44 words
A method for producing a liquid crystal display device according to claim 2, wherein the polymer resin composition obtained through the phase separation step includes at least one selected from the group consisting of a fluorine-containing compound, a chlorine-containing compound, and a silicon-containing compound.
Claim 10
Dependent Claim
30 words
A method for producing a liquid crystal display device according to claim 2, wherein the liquid crystal composition obtained through the phase separation step includes at least one dichroic dye.
Claim 11
Dependent Claim
53 words
A method for producing a liquid crystal display device according to claim 2, wherein the liquid crystal composition obtained through the phase separation step includes at least one of an optically active chiral dopant and a cholesteric liquid crystal added in a ratio, by weight, in a range of 0.1% to 10% thereto.
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