US5658697A
Expired / Lapsed
US
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Method for producing color filters by the use of anionic electrocoats
Assignee: Industrial Technology Research Institute
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Filing: 1996-04-17
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Granted: 1997-08-19
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Expires: 2016-04-17
Abstract
Abstract An improved method for making color filter plates from anionic electrocoats is disclosed. It comprises the steps of: (a) forming a positive photoresist layer on an electrically conductive transparent glass substrate; (b) exposing the portions of the glass substrate to be electrodeposited with a designated color electrocoat by removing corresponding portions of the positive photoresist layer using a photomasked light exposure procedure followed by a development procedure with a developer solution; (c) electrodepositing the designated color electrocoat on the exposed portions of the glass substrate; (d) performing a flood exposure on remaining portions of the positive photoresist; (e) performing a postbake procedure by heating the glass substrateto thereby harden the color electrocoat; (f) using a basic developer solution to remove the remaining portions of the positive photoresist; and (g) repeating steps (a) through (f) until all the desired electrocoats are electrodeposited on the glass substrate. The flood exposure step causes the photoresist to undergo a chemical reaction so that it will not crosslink during the postbake step and thus can be readily removed in step (f).
Inventors
- 👤 Hsien-Kuang Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:37
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/201; C; C25; C25D; C25D13/00; C25D13/12; G03; G03F; G03F7/00; G03F7/0005; G03F7/0007
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
184 words
A method for making color filter plates each having a plurality of color filters comprising the steps of: (a) forming a positive photoresist layer on an electrically conductive transparent glass substrate; (b) exposing portions of said glass substrate to be electrodeposited with a designated color electrocoat by removing corresponding portions of said positive photoresist layer using a photomasked light exposure procedure followed by a development procedure with a developer solution, wherein said electrocoat is an anionic electrocoat; (c) electrodepositing said designated color electrocoat on said exposed portions of said glass substrate; (d) performing a flood exposure on remaining portions of said positive photoresist; (e) performing a postbake procedure by heating said glass substrate to thereby harden said color electrocoat; (f) using a developer solution to remove said remaining portions of said positive photoresist; and (g) repeating steps (a) through (f) until all the desired electrocoats are electrodeposited on said glass substrate; (h) wherein said flood exposure step causes said photoresist to undergo a chemical reaction so that it will not crosslink during said postbake step and thus can be readily removed in step (f).
Claim 2
Independent Claim
184 words
A method for making color filter plates each having a plurality of color filters comprising the steps of: (a) forming a positive photoresist layer on an electrically conductive transparent glass substrate; (b) exposing portions of said glass substrate to be electrodeposited with a designated color electrocoat by removing corresponding portions of said positive photoresist layer using a photomasked light exposure procedure followed by a development procedure with a developer solution, wherein said electrocoat is an anionic electrocoat; (c) electrodepositing said designated color electrocoat on said exposed portions of said glass substrate; (d) performing a flood exposure on remaining portions of said positive photoresist; (e) performing a postbake procedure by heating said glass substrate to thereby harden said color electrocoat; (f) using a developer solution to remove said remaining portions of said positive photoresist; and (g) repeating steps (a) through (f) until all the desired electrocoats are electrodeposited on said glass substrate; (h) wherein said flood exposure step causes said photoresist to undergo a chemical reaction so that it will not crosslink during said postbake step and thus can be readily removed in step (f).
Claim 3
Dependent Claim
28 words
A method for making color filter plates according to claim 1 which further comprises the step of forming black matrix prior to the formation said positive photoresist layer.
Claim 4
Dependent Claim
24 words
A method for making color filter plates according to claim 1 wherein said positive photoresist comprises a cresol novolac resin and a quinonediazide compound.
Claim 5
Dependent Claim
28 words
A method for making color filter plates according to claim 3 wherein said flood exposure step causes quinonediazide groups of said positive photoresist to decomposed into carboxyl groups.
Claim 6
Dependent Claim
30 words
A method for making color filter plates according to claim 1 wherein said electrocoat is an anionic emulsified solution comprising an acrylic resin, a thermosetting melamine resin, and a pigment.
Claim 7
Dependent Claim
38 words
A method for making color filter plates according to claim 1 wherein said electrocoat is electrodeposited on said glass substrate under a voltage of about 15 to 80 volts for a duration of about 10 to 120 seconds.
Claim 8
Dependent Claim
29 words
A method for making color filter plates according to claim 1 wherein said flood exposure is conducted at an exposure energy of at least about 20 mJ/cm 2 .
Claim 9
Dependent Claim
29 words
A method for making color filter plates according to claim 1 wherein said flood exposure is conducted at an exposure energy of at least about 40 mJ/cm 2 .
Claim 10
Dependent Claim
27 words
A method for making color filter plates according to claim 1 wherein said postback step is conducted at temperatures between about 120° C. and about 220° C.
Claim 11
Dependent Claim
27 words
A method for making color filter plates according to claim 1 wherein said postback step is conducted at temperatures between about 130° C. and about 160° C.
Claim 12
Dependent Claim
24 words
A method for making color filter plates according to claim 1 wherein said postback step has a duration of about 5 to 60 minutes.
Claim 13
Dependent Claim
44 words
A method for making color filter plates according to claim 1 wherein said developer solution is a basic developer solution selected from the group consisting of sodium hydroxide, sodium metasilicate, potassium hydroxide, and tetramethylammonium hydroxide solutions at concentrations between 2 and 5 wt %.
Claim 14
Dependent Claim
23 words
A method for making color filter plates according to claim 1 wherein said color filter plate consists red, green, and blue color filters.
Claim 15
Dependent Claim
38 words
A method for making color filter plates according to claim 1 wherein each of said color filters comprises a plurality of generally square-shaped pixels arranged in a manner selected from the group consisting of triangle, mosaic, and stripes.
Claim 16
Dependent Claim
26 words
A method for making color filter plates according to claim 1 wherein said glass substrate comprises an indium tin oxide layer formed on a glass plate.
Claim 17
Dependent Claim
39 words
A method for making color filter plates according to claim 1 which further comprises a prebake step prior to said flood exposure step by heating said positivie photoresist at temperatures that will not cause said positive photoresist to crosslink.
Claim 18
Independent Claim
184 words
A method for making color filter plates each having a plurality of color filters comprising the steps of: (a) forming a positive photoresist layer on an electrically conductive transparent glass substrate; (b) exposing portions of said glass substrate to be electrodeposited with a designated color electrocoat by removing corresponding portions of said positive photoresist layer using a photomasked light exposure procedure followed by a development procedure with a developer solution, wherein said electrocoat is an anionic electrocoat; (c) performing a flood exposure on remaining portions of said positive photoresist; (d) electrodepositing said designated color electrocoat on said exposed portions of said glass substrate; (e) performing a postbake procedure by heating said glass substrate to thereby harden said color electrocoat; (f) using a developer solution to remove said remaining portions of said positive photoresist; and (g) repeating steps (a) through (f) until all the desired electrocoats are electrodeposited on said glass substrate; (h) wherein said flood exposure step causes said photoresist to undergo a chemical reaction so that it will not crosslink during said postbake step and thus can be readily removed in step (f).
Claim 19
Independent Claim
184 words
A method for making color filter plates each having a plurality of color filters comprising the steps of: (a) forming a positive photoresist layer on an electrically conductive transparent glass substrate; (b) exposing portions of said glass substrate to be electrodeposited with a designated color electrocoat by removing corresponding portions of said positive photoresist layer using a photomasked light exposure procedure followed by a development procedure with a developer solution, wherein said electrocoat is an anionic electrocoat; (c) performing a flood exposure on remaining portions of said positive photoresist; (d) electrodepositing said designated color electrocoat on said exposed portions of said glass substrate; (e) performing a postbake procedure by heating said glass substrate to thereby harden said color electrocoat; (f) using a developer solution to remove said remaining portions of said positive photoresist; and (g) repeating steps (a) through (f) until all the desired electrocoats are electrodeposited on said glass substrate; (h) wherein said flood exposure step causes said photoresist to undergo a chemical reaction so that it will not crosslink during said postbake step and thus can be readily removed in step (f).
Claim 20
Independent Claim
200 words
A method for making color filter plates each having a plurality of color filters comprising the steps of: (a) forming a positive photoresist layer on an electrically conductive transparent glass substrate; (b) exposing portions of said glass substrate to be electrodeposited with a designated color electrocoat by removing corresponding portions of said positive photoresist layer using a photomasked light exposure procedure followed by a development procedure with a developer solution, wherein said electrocoat is an anionic electrocoat; (c) performing a flood exposure on remaining portions of said positive photoresist; (d) electrodepositing said designated color electrocoat on said exposed portions of said glass substrate; (e) performing a postbake procedure by heating said glass substrate to thereby harden said color electrocoat; (f) using a developer solution to remove said remaining portions of said positive photoresist; and (g) repeating steps (a) through (f) until all the desired electrocoats, except the last electrocoat, are electrodeposited on said glass substrate; (h) depositing said last electrocoat on naked portions of said glass substrate; (i) wherein said flood exposure step causes said photoresist to undergo a chemical reaction so that it will not crosslink during said postbake step and thus can be readily removed in step (f).
Claim 21
Independent Claim
200 words
A method for making color filter plates each having a plurality of color filters comprising the steps of: (a) forming a positive photoresist layer on an electrically conductive transparent glass substrate; (b) exposing portions of said glass substrate to be electrodeposited with a designated color electrocoat by removing corresponding portions of said positive photoresist layer using a photomasked light exposure procedure followed by a development procedure with a developer solution, wherein said electrocoat is an anionic electrocoat; (c) performing a flood exposure on remaining portions of said positive photoresist; (d) electrodepositing said designated color electrocoat on said exposed portions of said glass substrate; (e) performing a postbake procedure by heating said glass substrate to thereby harden said color electrocoat; (f) using a developer solution to remove said remaining portions of said positive photoresist; and (g) repeating steps (a) through (f) until all the desired electrocoats, except the last electrocoat, are electrodeposited on said glass substrate; (h) depositing said last electrocoat on naked portions of said glass substrate; (i) wherein said flood exposure step causes said photoresist to undergo a chemical reaction so that it will not crosslink during said postbake step and thus can be readily removed in step (f).
Claim 22
Independent Claim
132 words
A method for making color filter plates each having at least one color filter, said color filter comprising a plurality of spaced apart color pixels which are formed by electrodepositing an anionic electrocoat on a conductive glass substrate using a positive photoresist in cooperation with a masked exposure procedure, said method comprising the steps of: (a) performing a flood exposure on said photoresist after said anionic electrocoat is electrodeposited on said conductive glass substrate; (b) heating said conductive glass substrate in a postbake step to thereby harden said electrocoat; and (c) removing said photoresist; (d) wherein said flood exposure step causes said photoresist to undergo a chemical reaction so that it will not crosslink during said postbake step and is thereby completely removed by a developer solution in said photoresist removal step.
Claim 23
Independent Claim
132 words
A method for making color filter plates each having at least one color filter, said color filter comprising a plurality of spaced apart color pixels which are formed by electrodepositing an anionic electrocoat on a conductive glass substrate using a positive photoresist in cooperation with a masked exposure procedure, said method comprising the steps of: (a) performing a flood exposure on said photoresist after said anionic electrocoat is electrodeposited on said conductive glass substrate; (b) heating said conductive glass substrate in a postbake step to thereby harden said electrocoat; and (c) removing said photoresist; (d) wherein said flood exposure step causes said photoresist to undergo a chemical reaction so that it will not crosslink during said postbake step and is thereby completely removed by a developer solution in said photoresist removal step.
Claim 24
Dependent Claim
41 words
A method for making color filter plates according to claim 19 which further comprises a prebake step prior to said flood exposure step in which said positive photoresist is heated at temperatures that will not cause said positive photoresist to crosslink.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-08-18 | 2001-02-17 | 2001-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-18 | 2005-02-17 | 2005-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-18 | 2009-02-17 | 2009-08-19 | $7700.00 | Window Closed / Lapsed |