Patent US5463484A successfully refreshed from Google Patents.
US5463484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing laminated U V-sensitive color filters for liquid crystal displays
Assignee: VERVE LLC
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Filing: 1993-10-29
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Granted: 1995-10-31
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Expires: 2013-10-29
Abstract
Abstract A method of producing a color filter to be used in conjunction with a display element such as an active or passive matrix liquid crystal panel. The color filter is formed by a stack of exposed and developed film layers, and each layer corresponds to a color of the resulting filter. The stack of exposed film layers is deposited on a transparent sheet.
Inventors
- 👤 Thomas P. Brody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:12
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02B; G02B5/00; G02B5/20; G02B5/201; G02F1/133509; G02F1/133514; G02F1/133516
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
184 words
A method of producing at least one color filter for an electronic display element comprising the steps of: a) laminating a pigmented layer structure onto a carrier sheet, wherein said pigmented layer structure includes an ultraviolet light-sensitive layer containing pigment of a first color of said at least one color filter and an attached release layer; b) removing said attached release layer; c) positioning a photomask adjacent said light-sensitive layer; d) exposing said light-sensitive layer to ultraviolet light; e) developing said exposed light-sensitive layer; f) laminating another pigmented layer structure onto said developed layer, wherein said another pigmented layer structure includes another ultraviolet light-sensitive layer containing pigment of another color of said at least one color filter and another attached release layer; g) removing said another attached release layer; h) positioning another photomask adjacent said another light-sensitive layer; i) exposing said another light-sensitive layer to ultraviolet light; j) developing said exposed another light-sensitive layer; k) repeating steps f) to j) for remaining colors of said color filter forming a stack of developed layers; and l) depositing transparent conductors onto said stack of developed layers.
Claim 2
Independent Claim
184 words
A method of producing at least one color filter for an electronic display element comprising the steps of: a) laminating a pigmented layer structure onto a carrier sheet, wherein said pigmented layer structure includes an ultraviolet light-sensitive layer containing pigment of a first color of said at least one color filter and an attached release layer; b) removing said attached release layer; c) positioning a photomask adjacent said light-sensitive layer; d) exposing said light-sensitive layer to ultraviolet light; e) developing said exposed light-sensitive layer; f) laminating another pigmented layer structure onto said developed layer, wherein said another pigmented layer structure includes another ultraviolet light-sensitive layer containing pigment of another color of said at least one color filter and another attached release layer; g) removing said another attached release layer; h) positioning another photomask adjacent said another light-sensitive layer; i) exposing said another light-sensitive layer to ultraviolet light; j) developing said exposed another light-sensitive layer; k) repeating steps f) to j) for remaining colors of said color filter forming a stack of developed layers; and l) depositing transparent conductors onto said stack of developed layers.
Claim 3
Dependent Claim
46 words
The method of claim 1 further including: i) laminating said stack of developed layers and said carrier sheet to a backing layer; and ii) removing said carrier sheet from said stack of developed layers prior to depositing said transparent conductors onto said stack of developed layers.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein said backing layer is formed of glass.
Claim 5
Dependent Claim
16 words
The method of claim 3 further including cutting said stack into a plurality of color filters.
Claim 6
Dependent Claim
29 words
The method of claim 4 wherein said stack is cut into said plurality of color filters subsequent to laminating said stack of developed layers to said glass backing layer.
Claim 7
Dependent Claim
29 words
The method of claim 1 further including depositing a planarizing layer onto said stack of developed layers prior to depositing said transparent conductors onto said stack of developed layers.
Claim 8
Dependent Claim
19 words
The method of claim 6 wherein said planarizing layer is selected from the group consisting of benzocyclobutene and perfluorocyclobutane.
Claim 9
Dependent Claim
30 words
The method of claim 1 wherein depositing said transparent conductors onto said stack of developed layers includes laminating an indium-tin oxide coated glass sheet to said stack of developed layers.
Claim 10
Dependent Claim
19 words
The method of claim 8 wherein said coated glass sheet has a thickness no greater than about 35 microns.
Claim 11
Dependent Claim
19 words
The method of claim 1 further comprising cutting said stack of developed layers into a plurality of color filters.
Claim 12
Dependent Claim
13 words
The method of claim 1 wherein said display device is an active matrix.
Claim 13
Dependent Claim
26 words
The method of claim 1 wherein said stack of developed layers includes four layers including a red layer, green layer, blue layer and a black layer.
Claim 14
Dependent Claim
52 words
The method of claim 1 further including laminating the completed filter stack to a second carrier sheet and peeling off said original carrier sheet, whereby said second carrier sheet improves the color purity of the topmost layer by removing any traces of adhesive which cling to the surface of said filter stack.
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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) | 1998-10-30 | 1999-05-01 | 1999-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-30 | 2003-05-01 | 2003-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-30 | 2007-05-01 | 2007-10-31 | $7700.00 | Window Closed / Lapsed |