US5301046A
Expired / Lapsed
US
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Electro-optical device having a layer comprising an oblate liquid crystal dispersed in a resin and method for forming the same
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1992-09-21
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Granted: 1994-04-05
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Expires: 2012-09-21
Abstract
Abstract A liquid crystal electro-optical device based on a dispersion-type liquid crystal, comprising a pair of substrates at least one of which is light-transmitting, having established thereon electrodes and an electro-optical modulating layer having incorporated between said pair of substrates, said electro-optical modulating layer being composed of a resin support having dispersed therein a liquid crystal material, wherein, the liquid crystal material as viewed in the cross section is dispersed in the resin support as droplets flattened along the direction parallel to the substrates. The dispersion-type liquid crystal electro-optical device according to the present invention has a high scattering efficiency and provides an excellent light-transmittance upon application of an electric field.
Inventors
- 👤 Toshimitsu Konuma
- 👤 Toshiji Hamatani
- 👤 Shunpei Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:51
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1334
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
97 words
An electro-optical device comprising: a pair of substrates at least one of which is transparent, said substrates having at least patterned electrodes formed thereon; and an electro-optical modulating layer provided between said substrates and comprising a resin and an oblate liquid crystal dispersed in said resin, wherein said oblate liquid crystal is shaped by pressing said pair of substrates towards one another with said resin having said liquid crystal therein so that a length of said oblate liquid crystal in a direction parallel to said substrates is larger than that in a direction perpendicular to said substrates.
Claim 2
Dependent Claim
97 words
An electro-optical device comprising: a pair of substrates at least one of which is transparent, said substrates having at least patterned electrodes formed thereon; and an electro-optical modulating layer provided between said substrates and comprising a resin and an oblate liquid crystal dispersed in said resin, wherein said oblate liquid crystal is shaped by pressing said pair of substrates towards one another with said resin having said liquid crystal therein so that a length of said oblate liquid crystal in a direction parallel to said substrates is larger than that in a direction perpendicular to said substrates.
Claim 3
Dependent Claim
42 words
The device of claim 1 wherein a ratio of a length of said oblate liquid crystal in the direction parallel to said substrates to a length of said oblate liquid crystal in the direction perpendicular to said substrates is 1.2 to 5.0.
Claim 4
Dependent Claim
30 words
The device of claim 1 wherein said oblate liquid crystal comprises a liquid crystal selected from the group consisting of nematic liquid crystal, cholesteric liquid crystal and smectic liquid crystal.
Claim 5
Dependent Claim
13 words
The device of claim 3 wherein said electro-optical modulating layer comprises a dye.
Claim 6
Dependent Claim
21 words
The device of claim 1 wherein a refractive index of said oblate liquid crystal is different from that of said resin.
Claim 7
Dependent Claim
19 words
The device of claim 1 wherein said oblate liquid crystal has a minor axis of 1 to 4 μm.
Claim 8
Independent Claim
48 words
A method for forming an electro-optical device comprising the steps of: forming between a pair of substrates an electro-optical modulating layer comprising a resin and a liquid crystal dispersed in said resin; and transforming said liquid crystal into an oblate shape by pressing said substrates toward one another.
Claim 9
Independent Claim
48 words
A method for forming an electro-optical device comprising the steps of: forming between a pair of substrates an electro-optical modulating layer comprising a resin and a liquid crystal dispersed in said resin; and transforming said liquid crystal into an oblate shape by pressing said substrates toward one another.
Claim 10
Dependent Claim
29 words
The method of claim 7 wherein said liquid crystal comprises a liquid crystal selected from the group consisting of nematic liquid crystal, cholesteric liquid crystal and smectic liquid crystal.
Claim 11
Dependent Claim
13 words
The method of claim 8 wherein said electro-optical modulating layer comprises a dye.
Claim 12
Dependent Claim
23 words
The method of claim 7 wherein said substrates are pressed at a pressure of 1 to 5 kg/cm 2 during said transforming step.
Claim 13
Dependent Claim
11 words
The method of claim 7 wherein said liquid crystal is encapsulated.
Claim 14
Dependent Claim
16 words
The method of claim 11 wherein said resin comprises a polyvinyl alcohol encapsulating said liquid crystal.
Claim 15
Dependent Claim
52 words
The method of claim 7 wherein said electro-optical modulating layer forming step is carried out by applying a solution comprising said resin, said liquid crystal and a solvent to one of said substrates, subsequently volatilizing said solvent, and providing the other one of said substrates on said resin and said liquid crystal.
Claim 16
Dependent Claim
22 words
The method of claim 7 wherein said substrates are pressed at a temperature of 50° to 150° C. during said transforming step.
Claim 17
Dependent Claim
20 words
The method of claim 13 wherein the application of said solution is carried out by spinner method or cast method.
Claim 18
Independent Claim
56 words
A method for forming an electro-optical device comprising the steps of: forming between a pair of substrates an electro-optical modulating layer comprising an ultraviolet ray hardening resin and a liquid crystal; irradiating said electro-optical modulating layer with an ultraviolet ray; and transforming said liquid crystal into an oblate shape by pressing said substrates toward one another.
Claim 19
Independent Claim
56 words
A method for forming an electro-optical device comprising the steps of: forming between a pair of substrates an electro-optical modulating layer comprising an ultraviolet ray hardening resin and a liquid crystal; irradiating said electro-optical modulating layer with an ultraviolet ray; and transforming said liquid crystal into an oblate shape by pressing said substrates toward one another.
Claim 20
Dependent Claim
29 words
The method of claim 16 wherein said liquid crystal comprises a liquid crystal selected from the group consisting of nematic liquid crystal, cholesteric liquid crystal and smectic liquid crystal.
Claim 21
Dependent Claim
13 words
The method of claim 17 wherein said electro-optical modulating layer comprises a dye.
Claim 22
Dependent Claim
23 words
The method of claim 16 wherein said substrates are pressed at a pressure of 1 to 5 kg/cm 2 during said transforming step.
Claim 23
Dependent Claim
22 words
The method of claim 16 wherein said substrates are pressed at a temperature of 50° to 150° C. during said transforming step.
Claim 24
Independent Claim
72 words
A method for forming an electro-optical device comprising the steps of: forming an electro-optical modulating layer between a pair of substrates having at least patterned electrodes formed thereon, said electro-optical modulating layer comprising a resin and droplets of a liquid crystal dispersed in said resin; and pressing said pair of substrates towards one another in order that the cross section of said droplets in a direction parallel to said substrates is increased.
Claim 25
Independent Claim
72 words
A method for forming an electro-optical device comprising the steps of: forming an electro-optical modulating layer between a pair of substrates having at least patterned electrodes formed thereon, said electro-optical modulating layer comprising a resin and droplets of a liquid crystal dispersed in said resin; and pressing said pair of substrates towards one another in order that the cross section of said droplets in a direction parallel to said substrates is increased.
Claim 26
Dependent Claim
16 words
The method of claim 21 wherein said substrates have TFTs for switching said electro-optical modulating layer.
Claim 27
Independent Claim
41 words
A method for forming an electro-optical device comprising the steps of: forming between a pair of substrates an electro-optical modulating layer comprising a resin and a liquid crystal dispersed in said resin; and reducing the space between said pair of substrates.
Claim 28
Independent Claim
41 words
A method for forming an electro-optical device comprising the steps of: forming between a pair of substrates an electro-optical modulating layer comprising a resin and a liquid crystal dispersed in said resin; and reducing the space between said pair of substrates.
Claim 29
Dependent Claim
24 words
The method of claim 23 wherein said reducing step is performed by pressing said pair of substrates toward one another after curing said resin.
References Cited (Backward Citations)
US4688900A
Cited
US5113270A
Cited
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