US5608555A
Expired / Lapsed
US
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Polymer dispersed liquid crystal display device, and a method for producing the same, wherein the polymer forms walls
Assignee: Sharp Corp
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Filing: 1995-06-01
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Granted: 1997-03-04
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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
2026-11-05 16:43
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: 16
Claim 1
Independent Claim
118 words
A method for producing a liquid crystal display device including the steps of: preparing a mixture of a polymerizable material and a liquid crystal material; and forming a display medium made of a polymer resin composition and a liquid crystal composition by phase separation through polymerization conducted by irradiating the mixture with light having a distribution of intensities ranging from high to low, the display medium interposed between a pair of substrates; and forming the polymer resin composition with a refractive index n p and the liquid crystal composition with an ordinary refractive index n o and an extraordinary refractive index n e in such a way so as to satisfy the following relationship: n.sub.o -0.04≦n.sub.p ≦(n.sub.e +n.sub.o)/2.
Claim 2
Independent Claim
118 words
A method for producing a liquid crystal display device including the steps of: preparing a mixture of a polymerizable material and a liquid crystal material; and forming a display medium made of a polymer resin composition and a liquid crystal composition by phase separation through polymerization conducted by irradiating the mixture with light having a distribution of intensities ranging from high to low, the display medium interposed between a pair of substrates; and forming the polymer resin composition with a refractive index n p and the liquid crystal composition with an ordinary refractive index n o and an extraordinary refractive index n e in such a way so as to satisfy the following relationship: n.sub.o -0.04≦n.sub.p ≦(n.sub.e +n.sub.o)/2.
Claim 3
Dependent Claim
39 words
A method for producing a liquid crystal display according to claim 1, wherein the light having a distribution of intensities ranging from high to low is obtained by substantially lowering the intensity of the light at a pixel region.
Claim 4
Dependent Claim
60 words
A method for producing a liquid crystal display according to claim 1, wherein the display medium forming 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 5
Independent Claim
144 words
A method for producing a liquid crystal display device including the steps of: preparing a mixture of a polymerizable material including at least one of a fluorine-containing polymer, a chlorine-containing polymer, and a silicone-containing polymer and a liquid crystal material including at least one of a fluorine-containing compound and a chlorine-containing compound; forming a display medium made of a polymer resin composition and a liquid crystal composition by phase separation through polymerization conducted by irradiating the mixture with light having a distribution of intensities ranging from high to low, the display medium interposed between a pair of substrates; and forming the polymer resin composition with a refractive index n p and the liquid crystal composition with an ordinary refractive index n o and an extraordinary refractive index n e in such a way so as to satisfy the following relationship: n.sub.o -0.04≦n.sub.p ≦(n.sub.e +n.sub.o)/2.
Claim 6
Independent Claim
144 words
A method for producing a liquid crystal display device including the steps of: preparing a mixture of a polymerizable material including at least one of a fluorine-containing polymer, a chlorine-containing polymer, and a silicone-containing polymer and a liquid crystal material including at least one of a fluorine-containing compound and a chlorine-containing compound; forming a display medium made of a polymer resin composition and a liquid crystal composition by phase separation through polymerization conducted by irradiating the mixture with light having a distribution of intensities ranging from high to low, the display medium interposed between a pair of substrates; and forming the polymer resin composition with a refractive index n p and the liquid crystal composition with an ordinary refractive index n o and an extraordinary refractive index n e in such a way so as to satisfy the following relationship: n.sub.o -0.04≦n.sub.p ≦(n.sub.e +n.sub.o)/2.
Claim 7
Dependent Claim
39 words
A method for producing a liquid crystal display according to claim 4, wherein the light having a distribution of intensities ranging from high to low is obtained by substantially lowering the intensity of the light at a pixel region.
Claim 8
Dependent Claim
23 words
A method for producing a liquid crystal display device according to claim 4, wherein the liquid crystal composition further includes one dichroic dye.
Claim 9
Dependent Claim
48 words
A method for producing a liquid crystal display device according to claim 4, wherein the liquid crystal composition further includes at least one of an optically active chiral dopant and a cholesteric liquid crystal added in a ratio, by weight, in the range of 0.1% to 10% thereto.
Claim 10
Dependent Claim
60 words
A method for producing a liquid crystal display according to claim 4, wherein the display medium forming 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 11
Independent Claim
137 words
A method for producing a liquid crystal display device including the steps of: preparing a mixture of a polymerizable material and a liquid crystal material; forming a display medium made of a polymer resin composition and a liquid crystal composition of phase separation through polymerization conducted by irradiating the mixture with light having a distribution of intensities ranging from high to low thereby forming a plurality of pixels partitioned by a polymer matrix, each pixel comprising at least one liquid crystal region, the display medium interposed between a pair of substrates; and forming the polymer resin composition with a refractive index n p and the liquid crystal composition with an ordinary refractive index n o and an extraordinary refractive index n e in such a way so as to satisfy the following relationship: n.sub.o -0.04≦n.sub.p ≦(n.sub.e +n.sub.o)/2.
Claim 12
Independent Claim
137 words
A method for producing a liquid crystal display device including the steps of: preparing a mixture of a polymerizable material and a liquid crystal material; forming a display medium made of a polymer resin composition and a liquid crystal composition of phase separation through polymerization conducted by irradiating the mixture with light having a distribution of intensities ranging from high to low thereby forming a plurality of pixels partitioned by a polymer matrix, each pixel comprising at least one liquid crystal region, the display medium interposed between a pair of substrates; and forming the polymer resin composition with a refractive index n p and the liquid crystal composition with an ordinary refractive index n o and an extraordinary refractive index n e in such a way so as to satisfy the following relationship: n.sub.o -0.04≦n.sub.p ≦(n.sub.e +n.sub.o)/2.
Claim 13
Dependent Claim
39 words
A method for producing a liquid crystal display according to claim 9, wherein the light having a distribution of intensities ranging from high to low is obtained by substantially lowering the intensity of the light at a pixel region.
Claim 14
Dependent Claim
23 words
A method for producing a liquid crystal display device according to claim 9, wherein the liquid crystal composition further includes one dichroic dye.
Claim 15
Dependent Claim
48 words
A method for producing a liquid crystal display device according to claim 9, wherein the liquid crystal composition further includes at least one of an optically active chiral dopant and a cholesteric liquid crystal added in a ratio, by weight, in the range of 0.1% to 10% thereto.
Claim 16
Dependent Claim
60 words
A method for producing a liquid crystal display according to claim 9, wherein the display medium forming 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.
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