US4983880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Edge breakdown protection in ACEL thin film display
Assignee: Osram Sylvania Inc
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Filing: 1990-08-08
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Granted: 1991-01-08
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Expires: 2010-08-08
Abstract
Abstract The present invention is directed to novel AC thin film electroluminescent display devices employing a protective dielectric stripe along the edges of the transparent electrode (or conductor). In particular, the present invention is directed to an AC thin film electroluminescent display device comprising: a multilayer stack including a first dielectric layer; a phosphor layer; and a second dielectric layer; situated on a glass substrate which includes parallel stripes of etched transparent conductors; said multilayer stack further including a protective stripe of dielectric material placed at least along the edges of the transparent conductors. The present invention is also directed to a method for protecting an AC thin film electroluminescent display device against premature breakdown at the edges of the transparent conductors. This protection is achieved by depositing a stripe of dielectric material along the edges of the transparent conductors.
Inventors
- 👤 Mohamed I. Abdalla
- 👤 Lawrence L. Hope
- 👤 Timothy Fohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:12
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; H05B33/28; H05B33/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
58 words
An Ac tin film electroluminescent display device comprising: a multilayer stack including a first dielectric layer; a phosphor layer; and a second dielectric layer; situated on a glass substrate which includes parallel stripes of etched transparent conductors; said multilayer stack further including plural protective stripes of dielectric material placed at least along the edges of the transparent conductors.
Claim 2
Dependent Claim
58 words
An Ac tin film electroluminescent display device comprising: a multilayer stack including a first dielectric layer; a phosphor layer; and a second dielectric layer; situated on a glass substrate which includes parallel stripes of etched transparent conductors; said multilayer stack further including plural protective stripes of dielectric material placed at least along the edges of the transparent conductors.
Claim 3
Dependent Claim
32 words
The AC thin film electroluminescent display device of claim 1, wherein the protective stripes of dielectric material at least partially fills the spaces between the parallel stripes of the etched transparent conductors.
Claim 4
Dependent Claim
43 words
The AC thin film electroluminescent display device of claim 2, wherein the protective stripes of dielectric material are selected from the group consisting of Y 2 O 3 , Si 3 N 4 , Al 2 O 3 , or any combination thereof.
Claim 5
Dependent Claim
24 words
The AC thin film electroluminescent display device of claim 3, wherein the protective stripes of dielectric material consist of Al 2 O 3 .
Claim 6
Dependent Claim
28 words
The AC thin film electroluminescent display device of claim 4, wherein the thickness of the protective stripes of dielectric material is from about 200 to about 1,000 Angstroms.
Claim 7
Dependent Claim
24 words
The AC thin film electroluminescent display device of claim 5, wherein the thickness of the protective stripes of dielectric material is about 500 Angstroms.
Claim 8
Independent Claim
39 words
A method for protecting an AC thin film electroluminescent display device against premature breakdown at the edges of the transparent electrodes comprising depositing plural protective stripes of dielectric material of sufficient thickness along the edges of the transparent electrodes.
Claim 9
Independent Claim
39 words
A method for protecting an AC thin film electroluminescent display device against premature breakdown at the edges of the transparent electrodes comprising depositing plural protective stripes of dielectric material of sufficient thickness along the edges of the transparent electrodes.
Claim 10
Dependent Claim
38 words
The method of claim 7, wherein the protective stripes of dielectric material are selected from the group consisting of Y 2 O 3 , Si 3 N 4 , Al 2 O 3 , or any combination thereof.
Claim 11
Dependent Claim
19 words
The method of claim 8, wherein the dielectric material of the protective stripes is Al 23 O 3 .
Claim 12
Dependent Claim
21 words
The method of claim 9, wherein the thickness of the protective dielectric stripes is from about 500 to about 1,000 Angstroms.
Claim 13
Dependent Claim
17 words
The method of claim 10, wherein the thickness of the protective dielectric stripes is about 500 Angstroms.
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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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |