US4776671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High property, high precision color filter and method for manufacturing the same
Assignee: Nissha Printing Co Ltd
•
Filing: 1986-11-28
•
Granted: 1988-10-11
•
Expires: 2006-11-28
Abstract
Abstract The high-property, high-precision color filter has an active film layer formed on a transparent substrate and comprised of at least one or more of active alumina or active silica, and fine patterns in the form of dot, stripe, and/or other patterns formed on the active film layer by a dye of any desired color being taken up into fine holes in the active film layer, and further an overcoat layer placed on the active film layer and having no affinity to the dye. In the method for manufacture of the color filter, the step of forming the fine patterns comprises mounting a metal mask having specified patterns holes on the active film layer, mounting a transfer sheet having an ink layer containing a dye on top of the active film layer, and subsequent heating in an atmosphere of reduced pressure. According to the invention, it is possible to obtain a color filter having excellent properties, including smoothness, heat resistance, water resistance, and light-resistance, and fine patterns in three colors, red green, and blue, having excellent spectral properties, and which can be manufactured by a simple process.
Inventors
- 👤 Takao Sumi
- 👤 Tenri Hiratani
- 👤 Yoshihide Inako
- 👤 Masahiro Nishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:18
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/223; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; G02F1/133516
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
175 words
A method of manufacturing a high-property, high-precision color filter, which comprises: (a) a step of forming on a transparent substrate an active film layer comprised of at least one or more of active alumina or active silica and mounting on said active film layer a metal mask having specified pattern holes; (b) a step of mounting on said metal mask a transfer sheet having an ink layer containing a heat migrating dye; (c) step of migrating said dye in said ink layer in vapor state to said active film layer by heating for dyeing said film layer; (d) a step of removing said transfer sheet and said metal mask; (e) repeating said steps (a) through (d) sequentially according to the number of colors required, thereby forming sequentially on said active film layer patterns corresponding to the pattern holes in said metal mask, and (f) a step of forming an overcoat layer for closing fine holes in said active film layer at the top thereof, said heating being carried out in an atmosphere of reduced pressure.
Claim 2
Independent Claim
175 words
A method of manufacturing a high-property, high-precision color filter, which comprises: (a) a step of forming on a transparent substrate an active film layer comprised of at least one or more of active alumina or active silica and mounting on said active film layer a metal mask having specified pattern holes; (b) a step of mounting on said metal mask a transfer sheet having an ink layer containing a heat migrating dye; (c) step of migrating said dye in said ink layer in vapor state to said active film layer by heating for dyeing said film layer; (d) a step of removing said transfer sheet and said metal mask; (e) repeating said steps (a) through (d) sequentially according to the number of colors required, thereby forming sequentially on said active film layer patterns corresponding to the pattern holes in said metal mask, and (f) a step of forming an overcoat layer for closing fine holes in said active film layer at the top thereof, said heating being carried out in an atmosphere of reduced pressure.
Claim 3
Dependent Claim
26 words
A method of manufacturing a high-property, high-precision color filter as set forth in claim 1, wherein said heat migrating dye is a dye capable of sublimation.
Claim 4
Dependent Claim
28 words
A method of manufacturing a high-property, high-precision color filter as set forth in claim 1, wherein said heat migrating dye is a hot-melt dye capable of being vaporized.
Claim 5
Dependent Claim
35 words
A method of manufacturing a high-property, high-precision color filter as set forth in claim 1, wherein said heat migrating dye consists of a dye capaable of sublimation and a hot-melt dye capable of being vaporized.
Claim 6
Dependent Claim
75 words
A high-property, high-precision color filter comprising a transparent substrate, an active film layer formed on said transparent substrate and comprised of at least one or more of active alumina or active silica, fine patterns formed on said active film layer by a dye of any desired color being taken up into fine holes in said active film layer, and an overcoat layer provided on said active film layer and having no affinity to said dye.
Claim 7
Dependent Claim
75 words
A high-property, high-precision color filter comprising a transparent substrate, an active film layer formed on said transparent substrate and comprised of at least one or more of active alumina or active silica, fine patterns formed on said active film layer by a dye of any desired color being taken up into fine holes in said active film layer, and an overcoat layer provided on said active film layer and having no affinity to said dye.
Claim 8
Dependent Claim
56 words
A high-property, high-precision color filter as set forth in claim 5, wherein said active film layer is an active alumina layer and wherein said active alumina layer is formed of an alumina sol having an electric conductance of more than 3.70 mΩ -1 cm -1 , said layer, after being calcined, having a thickness of 1μm˜5μm.
Claim 9
Dependent Claim
19 words
A high-property, high-precision color filter as set forth in claim 5, wherein said dye is a heat migrating dye.
Claim 10
Dependent Claim
22 words
A high-property, high-precision color filter as set forth in claim 7 wherein said heat migrating dye is a dye capable of sublimation.
Claim 11
Dependent Claim
24 words
A high-property, high-precision color filter as set forth in claim 7, wherein said heat migrating dye is a hot-melt dye capable of being vaporized.
Claim 12
Dependent Claim
30 words
A high-property, high-precision color filter as set forth in claim 7, wherein said heat-migrating dye consists of a dye capable of sublimation and a hot-melt dye capable of being vaporized.
Claim 13
Dependent Claim
18 words
A high-property, high-precision color filter as set forth in claim 5, wherein said pattern is a dot pattern.
Claim 14
Dependent Claim
18 words
A high-property, high-precision color filter as set forth in claim 5, wherein said pattern is a stripe pattern.
Claim 15
Dependent Claim
68 words
A high-property, high-precision color filter as set forth in claim 11, wherein said dot pattern consists of three colors, red, green, and blue, and wherein said dot pattern has a maximum transmittance wavelength within the wavelength ranges of 570˜700 nm for red, 480˜580 nm for green, and 400˜480 nm for blue, and wherein said dot pattern is dimensionally as fine as several tens to several hundreds of μm.
Claim 16
Dependent Claim
37 words
A high-property, high-precision color filter as set forth in claim 5, wherein said overcoat layer is formed of an organic or inorganic material capable of forming a good bond with a material constituting a transparent conductive layer.
Claim 17
Dependent Claim
34 words
A high-property, high-precision color filter as set forth in claim 14, wherein that portion of said overcoat layer which corresponds to the entire surface of said pattern is covered with the transparent conductive layer.
References Cited (Backward Citations)
US4012250A
Cited
JPS503045B1
Cited
US4081277A
Cited
JPS53110379A
Cited
US4196009A
Cited
US4196010A
Cited
US4388387A
Cited
JPS55166607A
Cited
US4383018A
Cited
US4239842A
Cited
US4600833A
Cited
JPS5986011A
Cited
JPS60254001A
Cited
JPS6151102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |