Patent US5176971A successfully refreshed from Google Patents.
US5176971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color filter
Assignee: Kyodo Printing Co Ltd
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Filing: 1991-08-05
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Granted: 1993-01-05
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Expires: 2011-08-05
Abstract
Abstract A technique related to color filters to be arranged on the light-receiving surface of a color liquid crystal display device, color video camera, and the like. The color filter consists of a substrate (10) and a colored filter layer (12) formed thereon. The colored filter layer (12) comprises, for example, three groups of filter picture elements (14R), 14G, 14B) having spectral characteristics respectively corresponding to red, green and blue. Each group of filter picture elements are made of polyimide resin and dye contained therein. Further, each group of the filter picture elements (R, G, B) are arranged in direct contact with one surface of the substrate (10) without using any intermediate protecting film. The first group of filter picture elements patterned on one surface of the substrate (10) are subjected to heat treatment at a high temperature of about 250 DEG C., for example, to increase their resistance against the solvent. Then, a second coating layer for patterning the second group of filter picture elements is directly formed without using any intermediate protecting film.
Inventors
- 👤 Masayoshi Shimamura
- 👤 Tadahiro Furukawa
- 👤 Akiyoshi Murakami
- 👤 Toshio Haga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:14
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; G02F1/133516
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
141 words
A color filter adapted to be placed on a light-receiving surface comprising: (a) a substrate having one surface parallel to the light-receiving surface; and (b) a color filter layer formed on said one surface of said substrate; said color filter layer comprising not less than tow groups of filter picture elements having different spectral characteristics, each of groups being composed of a number of said filter picture elements, each of said filter picture elements of each group comprising a polyimide and coloring dye retained in said polyimide, and each filter picture element being disposed in direct contact with said one surface of said substrate, said color dye being of a relatively high solubility in the polyimide polymer which provides the filter element with excellent transparency, excellent coating properties and uniform tinting, said dye having thermal resistance of at least 250° C.
Claim 2
Dependent Claim
141 words
A color filter adapted to be placed on a light-receiving surface comprising: (a) a substrate having one surface parallel to the light-receiving surface; and (b) a color filter layer formed on said one surface of said substrate; said color filter layer comprising not less than tow groups of filter picture elements having different spectral characteristics, each of groups being composed of a number of said filter picture elements, each of said filter picture elements of each group comprising a polyimide and coloring dye retained in said polyimide, and each filter picture element being disposed in direct contact with said one surface of said substrate, said color dye being of a relatively high solubility in the polyimide polymer which provides the filter element with excellent transparency, excellent coating properties and uniform tinting, said dye having thermal resistance of at least 250° C.
Claim 3
Dependent Claim
15 words
A color filter according to claim 1, in which said substrate is a light-transmitting plate.
Claim 4
Dependent Claim
21 words
A color filter according to claim 1, in which said substrate has a transparent electrode layer on said one surface thereof.
Claim 5
Dependent Claim
29 words
A color filter according to claim 1, in which each of said filter picture elements is a square shape, said filter picture elements being arranged in a matrix manner.
Claim 6
Dependent Claim
24 words
A color filter according to claim 4, in which each adjacent filter picture elements in both transverse and longitudinal directions have different spectral characteristics.
Claim 7
Dependent Claim
29 words
A color filter according to claim 1, in which there are provided three groups of filter picture elements having respective spectral characteristics corresponding respectively to red, green and blue.
Claim 8
Dependent Claim
27 words
A color filter according to claim 6, in which a light-intercepting layer is disposed at a boundary between each adjacent filter picture elements of said three groups.
Claim 9
Dependent Claim
21 words
A color filter according to claim 7, in which said light-intercepting layer comprises polyimide and black dye retained in said polyimide.
Claim 10
Dependent Claim
24 words
A color filter according to claim 7, in which said light-intercepting layer is disposed in direct contact with said one surface of the substrate.
Claim 11
Dependent Claim
24 words
A color filter according to claim 1, in which a transparent protective layer is applied to an upper surface of said color filter layer.
Claim 12
Dependent Claim
21 words
A color filter according to claim 2, in which said substrate has a transparent electrode layer on said one surface thereof.
Claim 13
Dependent Claim
24 words
A color filter according to claim 8, in which said light-intercepting layer is disposed in direct contact with said one surface of the substrate.
Claim 14
Dependent Claim
24 words
A color filter according to claim 7, in which a transparent protective layer is applied to an upper surface of said color filter layer.
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) | 1996-01-05 | 1996-07-06 | 1997-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-05 | 2000-07-06 | 2001-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-05 | 2004-07-06 | 2005-01-05 | $7700.00 | Window Closed / Lapsed |