US5595790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a reflective surface for a LCD
Assignee: China Star Optoelectronics International HK Ltd
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Filing: 1996-06-21
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Granted: 1997-01-21
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Expires: 2016-06-21
Abstract
Abstract An effective non-specular reflector, for use in a Liquid Crystal Display, is formed by first coating a substrate with a two component solution. One component hardens when heated or when exposed to ultraviolet light (optionally through a mask) while the other component remains liquid. The result is a solid layer in which are dispersed multiple liquid regions, some of which break the surface where they are easily removed, leaving behind a roughened surface. Once a high reflectance metal has been deposited onto this surface it becomes an effective nonspecular reflector. Examples of materials for use as the two components are given.
Inventors
- 👤 Chung-Kuang Wei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:16
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G18/3876; C08G18/67; C08G18/671; C08G18/672; G; G02; G02B; G02B1/00; G02B1/10; G02B1/12; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133553; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/26; G03F7/40; G02B5/00; G02B5/08; G02B5/0808
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
121 words
A method for forming a non-specular reflecting surface for use in a liquid crystal display comprising: providing a solution consisting of a first component, that is subject to hardening when exposed to ultraviolet light, and a second component that is not subject to hardening when exposed to ultraviolet light; providing a substrate; coating said substrate with a layer of the solution; exposing the solution to ultraviolet light thereby transforming the solution to a solid layer, having an upper surface, wherein are dispersed liquid regions; removing said liquid regions wherever they are part of said upper surface, thereby deplanarizing said surface; heating the layer to solidify said liquid regions; and depositing a layer of a reflective material on said deplanarized upper surface.
Claim 2
Independent Claim
121 words
A method for forming a non-specular reflecting surface for use in a liquid crystal display comprising: providing a solution consisting of a first component, that is subject to hardening when exposed to ultraviolet light, and a second component that is not subject to hardening when exposed to ultraviolet light; providing a substrate; coating said substrate with a layer of the solution; exposing the solution to ultraviolet light thereby transforming the solution to a solid layer, having an upper surface, wherein are dispersed liquid regions; removing said liquid regions wherever they are part of said upper surface, thereby deplanarizing said surface; heating the layer to solidify said liquid regions; and depositing a layer of a reflective material on said deplanarized upper surface.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said first liquid component is a photosensitive monomer.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein said photosensitive monomer further comprises: trimethololpropane diallyl ether, trimethololpropane tris thiol, isophorone diisocynate ester, and benzophenone photoinitiator.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein said second liquid component is a liquid crystal.
Claim 6
Dependent Claim
20 words
The method of claim 4 wherein said liquid crystal further comprises: cyano compounds, terphenyl, cyclohexylphenyl, cyclohexylbiphenyl, and two other biphenyls.
Claim 7
Dependent Claim
31 words
The method of claim 1 wherein the ratio of the concentrations of said first and second liquid components in said solution is between about 10 and 0.1 to 1, by weight.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein the step of exposing to ultraviolet light is performed through a mask.
Claim 9
Dependent Claim
18 words
The method of claim 1 wherein the method for coating the substrate with the solution is spin coating.
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein said reflective material is taken from the group consisting of aluminum, silver, chromium and molybdenum.
Claim 11
Dependent Claim
28 words
The method of claim 1 wherein the method for depositing the metallic layer is taken from the group consisting of sputtering, vacuum evaporation, chemical vapor deposition, and electrodeposition.
Claim 12
Independent Claim
103 words
A method for forming a non-specular reflecting surface for use in a liquid crystal display comprising: providing a solution consisting of a first component; providing a substrate; coating said substrate with a layer of the solution; subjecting the solution to a first heat treatment thereby transforming the solution to a solid layer, having an upper surface, wherein are dispersed liquid regions; removing said liquid regions wherever they are part of said upper surface, thereby deplanarizing said surface; subjecting the layer to a second heat treatment to solidify said liquid regions; and depositing a layer of a reflective material on said deplanarized upper surface.
Claim 13
Independent Claim
103 words
A method for forming a non-specular reflecting surface for use in a liquid crystal display comprising: providing a solution consisting of a first component; providing a substrate; coating said substrate with a layer of the solution; subjecting the solution to a first heat treatment thereby transforming the solution to a solid layer, having an upper surface, wherein are dispersed liquid regions; removing said liquid regions wherever they are part of said upper surface, thereby deplanarizing said surface; subjecting the layer to a second heat treatment to solidify said liquid regions; and depositing a layer of a reflective material on said deplanarized upper surface.
Claim 14
Dependent Claim
15 words
The method of claim 11 wherein said first liquid component is a heat sensitive monomer.
Claim 15
Dependent Claim
17 words
The method of claim 11 and further comprising a second liquid component which is a liquid crystal.
Claim 16
Dependent Claim
31 words
The method of claim 13 wherein the ratio of the concentrations of said first and second liquid components in said solution is between about 10 and 0.1 to 1, by weight.
References Cited (Backward Citations)
US5220444A
Cited
US5204765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2000-01-21 | 2000-07-22 | 2001-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-21 | 2004-07-22 | 2005-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-21 | 2008-07-22 | 2009-01-21 | $7700.00 | Window Closed / Lapsed |