Patent US4442136A successfully refreshed from Google Patents.
US4442136A
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Electroluminescent display with laser annealed phosphor
Assignee: Texas Instruments Inc
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Filing: 1982-03-02
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Granted: 1984-04-10
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Expires: 2002-03-02
Abstract
Abstract A method for producing AC-driven thin film electroluminescent displays, wherein the phosphor is laser annealed to enhance crystallinity. Preferably the phosphor is zinc fluoride, which has a relatively low melting point, facilitating low temperature processing.
Inventors
- 👤 Milo R. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:21
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145; H05B33/22
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
52 words
A process for fabricating thin film electroluminescent displays, comprising the steps of: providing a transparent substrate; providing a patterned transparent conductor on said substrate; providing a first continuous dielectric layer on said pattern conductor; providing a phosphor layer on said first dielectric layer; and transiently annealing said phosphor to induce recrystallization therein.
Claim 2
Dependent Claim
52 words
A process for fabricating thin film electroluminescent displays, comprising the steps of: providing a transparent substrate; providing a patterned transparent conductor on said substrate; providing a first continuous dielectric layer on said pattern conductor; providing a phosphor layer on said first dielectric layer; and transiently annealing said phosphor to induce recrystallization therein.
Claim 3
Dependent Claim
25 words
The process of claim 1, further comprising the step of applying a second uniform dielectric layer on said phosphor, prior to said step of annealing.
Claim 4
Dependent Claim
24 words
The process of claim 1, further comprising the step of: providing an inert atmosphere in contact with said phosphor, during said step of annealing.
Claim 5
Dependent Claim
15 words
The process of claim 1, 2, or 3, wherein said annealing step comprises laser annealing.
Claim 6
Dependent Claim
14 words
The process of claim 1, 2, or 3 wherein said phosphor comprises zinc fluoride.
Claim 7
Dependent Claim
11 words
The process of claim 4, wherein said phosphor comprises zinc fluoride.
Claim 8
Dependent Claim
11 words
The process of claim 4, wherein said phosphor comprises zinc sulfide.
Claim 9
Dependent Claim
20 words
The process of claim 1, 2, or 3, wherein said phosphor layer has a melting point below 1200 degrees C.
Claim 10
Dependent Claim
17 words
The process of claim 4, wherein said phosphor layer has a melting point below 1200 degrees C.
Claim 11
Dependent Claim
33 words
The process of claim 1 or 2, wherein each said dielectric layer comprises a composite of a first material having a high dielectric constant and a second material having a low dielectric loss.
Claim 12
Dependent Claim
18 words
The process of claim 10, wherein said first material is titanium dioxide and said second material is alumina.
Claim 13
Dependent Claim
17 words
The process of claim 1, wherein said annealing step is applied to substantially all of said phosphor.
Claim 14
Dependent Claim
11 words
The process of claim 1, wherein said substrate comprises borosilicate glass.
Claim 15
Dependent Claim
11 words
The process of claim 6, wherein said substrate comprises borosilicate glass.
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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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |