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US5598058A
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Multi-color electroluminescent display
Assignee: TECHNOMARK Inc
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Filing: 1995-02-09
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Granted: 1997-01-28
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Expires: 2015-02-09
Abstract
Abstract A thick-film multi-color electroluminescent display (10) includes a transparent substrate (12), a transparent electrode (14) deposited on the substrate (12), a phosphor layer (16) deposited on the transparent electrode (14) having two regions (18, 20) having different compositions providing visually distinct spectra of light when placed in a common electric field, a dielectric layer (22) deposited on the phosphor layer (16), and a second electrode (24) deposited on the dielectric layer (22). In an alternate embodiment, the phosphor layer (16) is composed of a marbled ink having a mixture of a first phosphor ink and a second phosphor ink having different compositions providing visually distinct spectra of light when placed in a common electric field. In another alternate embodiment, the phosphor layer (16) is composed of at least two halftone screen prints corresponding to at least two phosphor compositions providing visually distinct spectra of light when placed in a common electric field.
Inventors
- 👤 Bradley J. LaPointe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:30
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A thick film multi-color display comprising: a transparent substrate; a transparent electrode deposited thereon; a phosphor layer deposited thereon, said phosphor layer having at least two regions having different overall compositions providing visually distinct spectra of light, said compositions selected to luminesce when placed in a common electric field; a dielectric layer deposited onto said phosphor layer; and a second electrode deposited on to said dielectric layer.
Claim 2
Dependent Claim
67 words
A thick film multi-color display comprising: a transparent substrate; a transparent electrode deposited thereon; a phosphor layer deposited thereon, said phosphor layer having at least two regions having different overall compositions providing visually distinct spectra of light, said compositions selected to luminesce when placed in a common electric field; a dielectric layer deposited onto said phosphor layer; and a second electrode deposited on to said dielectric layer.
Claim 3
Dependent Claim
20 words
The multi-color display of claim 1 wherein said at least two regions of said phosphor layer have distinct homogenous compositions.
Claim 4
Dependent Claim
61 words
The multi-color display of claims 1 wherein said at least two regions of said phosphor layer are composed of a multiplicity of dots differing in chemistry, each of said regions having a distribution of said dots such that said dots collectively, when placed in an electric field, luminesce with a light which is distinct with respect to each of said regions.
Claim 5
Dependent Claim
103 words
A thick film multi-color display comprising: a transparent substrate; a transparent electrode deposited thereon; a phosphor layer deposited onto said transparent electrode, said phosphor layer being formed using a marbled ink, said marbled ink comprising a mixture of a first phosphor ink and a second phosphor ink, said first phosphor ink and said second phosphor ink having compositions such that when said phosphor layer is placed in an electric field, said first phosphor ink and said second phosphor ink luminesce with light having visually different colors; a dielectric layer deposited onto said phosphor layer; and a second electrode deposited onto said dielectric layer.
Claim 6
Dependent Claim
103 words
A thick film multi-color display comprising: a transparent substrate; a transparent electrode deposited thereon; a phosphor layer deposited onto said transparent electrode, said phosphor layer being formed using a marbled ink, said marbled ink comprising a mixture of a first phosphor ink and a second phosphor ink, said first phosphor ink and said second phosphor ink having compositions such that when said phosphor layer is placed in an electric field, said first phosphor ink and said second phosphor ink luminesce with light having visually different colors; a dielectric layer deposited onto said phosphor layer; and a second electrode deposited onto said dielectric layer.
Claim 7
Dependent Claim
28 words
The thick film multi-color display of claim 4 wherein said marbled ink further comprises dispersed droplets of said second phosphor ink partially intermingled with said first phosphor ink.
Claim 8
Dependent Claim
89 words
A thick film multi-color display comprising: a transparent substrate; a transparent electrode deposited thereon; a phosphor layer deposited thereon, said phosphor layer being deposited with at least two halftone screens, each of said at least two halftone screens being used to deposit a corresponding one of at least two phosphor compositions providing a visually distinct spectrum of light, said phosphor compositions selected to luminesce when placed in a common electric field; a dielectric layer deposited onto said phosphor layer; and a second electrode deposited on to said dielectric layer.
Claim 9
Dependent Claim
89 words
A thick film multi-color display comprising: a transparent substrate; a transparent electrode deposited thereon; a phosphor layer deposited thereon, said phosphor layer being deposited with at least two halftone screens, each of said at least two halftone screens being used to deposit a corresponding one of at least two phosphor compositions providing a visually distinct spectrum of light, said phosphor compositions selected to luminesce when placed in a common electric field; a dielectric layer deposited onto said phosphor layer; and a second electrode deposited on to said dielectric layer.
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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) | 2000-01-28 | 2000-07-29 | 2001-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-28 | 2004-07-29 | 2005-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-28 | 2008-07-29 | 2009-01-28 | $7700.00 | Window Closed / Lapsed |