US5357356A
Expired / Lapsed
US
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Electro-optical device and method for forming the same
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1992-12-23
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Granted: 1994-10-18
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Expires: 2012-12-23
Abstract
Abstract A process for fabricating a polymer-dispersed liquid crystal electro-optical device, which comprises: placing a mixture of a liquid crystal material having anisotropy in refractive index and a photocurable resin on a substrate equipped with an electrode; and curing the resin by irradiating a light to said mixture; wherein, said light has such a wavelength distribution that it covers the peak of light absorption of the portion which undergoes photo-curing reaction in said photocurable resin, provided that 90% or more of said light is distributed within a wavelength range ±20 nm from the wavelength of said light absorption peak of the resin.
Inventors
- 👤 Toshimitsu Konuma
- 👤 Takeshi Nishi
- 👤 Michio Shimizu
- 👤 Kouji Moriya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:25
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1334
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
77 words
A method for forming an electro-optical device comprising the steps of: providing a mixture comprising a liquid crystal and a photocurable resin on a substrate; and irradiating said mixture with a light to harden said photocurable resin, the reaction initiator for said photocurable resin having a characteristic light absorption peak wavelength, wherein said light absorption peak wavelength minus 20 nm to said light absorption peak wavelength plus 20 nm accounts for 90% or more of said light.
Claim 2
Independent Claim
77 words
A method for forming an electro-optical device comprising the steps of: providing a mixture comprising a liquid crystal and a photocurable resin on a substrate; and irradiating said mixture with a light to harden said photocurable resin, the reaction initiator for said photocurable resin having a characteristic light absorption peak wavelength, wherein said light absorption peak wavelength minus 20 nm to said light absorption peak wavelength plus 20 nm accounts for 90% or more of said light.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said light is obtained by passing through a filter a light emitted from a light source.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein said light comprises a light having a single wavelength.
Claim 5
Dependent Claim
16 words
The method of claim 3 wherein said light having a single wavelength is a laser light.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein said liquid crystal is dispersed in said photocurable resin by the irradiation of said light.
Claim 7
Dependent Claim
29 words
The method of claim 1 wherein said light absorption peak wavelength minus 20 nm to said light absorption peak wavelength plus 20 nm is 380 nm to 420 nm.
Claim 8
Dependent Claim
24 words
The method of claim 1 further comprising the steps of: forming an electrode on the mixture; and forming a protection film on said electrode.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein said substrate is provided with an electrode thereon.
Claim 10
Independent Claim
86 words
A method for forming an electro-optical device comprising the steps of: mating a pair of substrates with a space therebetween; introducing a mixture comprising a liquid crystal and a photocurable resin into said space; and irradiating said mixture with a light to harden said photocurable resin, the reaction initiator for said photocurable resin having a characteristic light absorption peak wavelength, wherein said light absorption peak wavelength minus 20 nm to said light absorption peak wavelength plus 20 nm accounts for 90% or more of said light.
Claim 11
Independent Claim
86 words
A method for forming an electro-optical device comprising the steps of: mating a pair of substrates with a space therebetween; introducing a mixture comprising a liquid crystal and a photocurable resin into said space; and irradiating said mixture with a light to harden said photocurable resin, the reaction initiator for said photocurable resin having a characteristic light absorption peak wavelength, wherein said light absorption peak wavelength minus 20 nm to said light absorption peak wavelength plus 20 nm accounts for 90% or more of said light.
Claim 12
Dependent Claim
22 words
The method of claim 9 wherein said light is obtained by passing through a filter a light emitted from a light source.
Claim 13
Dependent Claim
13 words
The method of claim 10 wherein said filter is a band pass filter.
Claim 14
Dependent Claim
15 words
The method of claim 9 wherein said light comprises a light having a single wavelength.
Claim 15
Dependent Claim
16 words
The method of claim 12 wherein said light having a single wavelength is a laser light.
Claim 16
Dependent Claim
21 words
The method of claim 9 wherein said liquid crystal is dispersed in said photocurable resin by the irradiation of said light.
Claim 17
Dependent Claim
29 words
The method of claim 9 wherein said light absorption peak wavelength minus 20 nm to said light absorption peak wavelength plus 20 nm is 380 nm to 420 nm.
Claim 18
Dependent Claim
47 words
An electro-optical device comprising: a substrate provided with an electrode thereon; and an electro-optical modulating layer provided on said substrate and comprising a liquid crystal and a resin, wherein said resin comprises a photocurable part having a light absorption peak wavelength of 380 nm to 420 nm.
Claim 19
Dependent Claim
47 words
An electro-optical device comprising: a substrate provided with an electrode thereon; and an electro-optical modulating layer provided on said substrate and comprising a liquid crystal and a resin, wherein said resin comprises a photocurable part having a light absorption peak wavelength of 380 nm to 420 nm.
Claim 20
Dependent Claim
15 words
The device of claim 16 further comprising another substrate provided on said electro-optical modulating layer.
Claim 21
Dependent Claim
15 words
The device of claim 16 further comprising another electrode provided on said electro-optical modulating layer.
Claim 22
Dependent Claim
15 words
The device of claim 18 further comprising a protection film provided on said another electrode.
Claim 23
Dependent Claim
15 words
The device of claim 16 wherein said resin surrounds a droplet comprising said liquid crystal.
Claim 24
Independent Claim
77 words
A method for manufacturing a liquid crystal electro-optical device comprising the steps of: preparing a mixture comprising a liquid crystal and a photocurable resin containing a reaction initiator; and curing said photocurable resin by irradiating said mixture with a light emitted from a light source, wherein a filter is placed in a light path between said mixture and said light source in order to selectively pass a light which is to be absorbed by said reaction initiator.
Claim 25
Independent Claim
77 words
A method for manufacturing a liquid crystal electro-optical device comprising the steps of: preparing a mixture comprising a liquid crystal and a photocurable resin containing a reaction initiator; and curing said photocurable resin by irradiating said mixture with a light emitted from a light source, wherein a filter is placed in a light path between said mixture and said light source in order to selectively pass a light which is to be absorbed by said reaction initiator.
Claim 26
Dependent Claim
43 words
The device of claim 21 wherein the light after passing through said filter is such that at least 90% of the light has a wavelength which is within ±20 nm of the light absorption peak wavelength of the reaction initiator in the resin.
Claim 27
Dependent Claim
13 words
The device of claim 21 wherein said light source is a mercury lamp.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-17 | 1998-04-18 | 1998-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-17 | 2002-04-18 | 2002-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-17 | 2006-04-18 | 2006-10-18 | $7700.00 | Window Closed / Lapsed |