US4770950A
Expired / Lapsed
US
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Thin film electroluminescent device
Assignee: Murata Manufacturing Co Ltd
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Filing: 1987-03-18
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Granted: 1988-09-13
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Expires: 2007-03-18
Abstract
Abstract A thin film luminescent device comprises a luminescent layer which consists essentially of a luminous matrix compound of an alkaline earth metal sulfide, a luminescent center element of the rare earth elements embedded in the matrix compound, and additives of copper incorporated in the matrix compound. The content of copper is not more than 1 wt % with respect to the amount of the alkaline earth metal sulfide in the thin film luminescent layer.
Inventors
- 👤 Hideomi Ohnishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:53
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
A thin film luminescent (EL) device comprising: a substrate; a first electrode layer formed on said substrate; a thin-film EL layer formed on said first electrode layer; second electrode means formed on the EL layer; said EL layer consisting essentially of a luminous matrix compound of an alkaline earth metal sulfide, a luminescent center element of the rare earth elements embedded in the matrix compound, and additives of copper incorporated in the matrix compound.
Claim 2
Dependent Claim
74 words
A thin film luminescent (EL) device comprising: a substrate; a first electrode layer formed on said substrate; a thin-film EL layer formed on said first electrode layer; second electrode means formed on the EL layer; said EL layer consisting essentially of a luminous matrix compound of an alkaline earth metal sulfide, a luminescent center element of the rare earth elements embedded in the matrix compound, and additives of copper incorporated in the matrix compound.
Claim 3
Dependent Claim
39 words
The thin film electroluminescent device according to claim 1 wherein the content of copper is substantially not more than 1 wt% with respect to the amount of the alkaline earth metal sulfide in the thin film luminescent (EL) layer.
Claim 4
Dependent Claim
24 words
A thin film EL device as in claim 1, wherein said first electrode layer has a terminal electrode formed on a peripheral portion thereof.
Claim 5
Dependent Claim
18 words
A thin film EL device as in claim 1, wherein said substrate is substantially a transparent insulating substrate.
Claim 6
Dependent Claim
17 words
A thin film EL device as in claim 4, wherein said first electrode layer is substantially transparent.
Claim 7
Dependent Claim
29 words
A thin film EL device as in claim 1, further comprising a pair of insulating layers formed between said EL layer and said first and second electrode layers, respectively.
Claim 8
Dependent Claim
39 words
An electroluminescent composition consisting essentially of a luminous matrix compound of an alkaline earth metal sulfide, a luminescent center element of the rare earth elements embedded in the matrix compound, and additives of copper incorporated in the matrix compound.
Claim 9
Dependent Claim
39 words
An electroluminescent composition consisting essentially of a luminous matrix compound of an alkaline earth metal sulfide, a luminescent center element of the rare earth elements embedded in the matrix compound, and additives of copper incorporated in the matrix compound.
Claim 10
Dependent Claim
30 words
An electroluminescent composition according to claim 7, wherein the content of copper is substantially not more than 1 wt% with respect to the amount of the alkaline earth metal sulfide.
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) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |