US4668582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film EL panel
Assignee: Panasonic Holdings Corp
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Filing: 1985-03-19
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Granted: 1987-05-26
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Expires: 2005-03-19
Abstract
Abstract New black color insulator thin films comprising Pr oxide, composite oxides of Pr-Mn, Pr-Ni, Pr-Co or Mn oxide are used to constitute at least one part or all parts of interface film between a phosphor film and a back electrode film of an AC thin film EL panel; and the panel with such a high contrast as 5:1 even at an illumination of 400 lux has been obtained.
Inventors
- 👤 Tomizo Matsuoka
- 👤 Masahiro Nishikawa
- 👤 Yosuke Fujita
- 👤 Atsushi Abe
- 👤 Tsuneharu Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:53
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C28/00; H; H05; H05B; H05B33/00; H05B33/12; H05B33/22; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A thin film EL panel comprising: a transparent electrode film, a phosphor film formed above said transparent electrode film, a thin insulator film formed on said phosphor film and at least a part thereof is a thin film of an oxide selected from the group consisting of (i) Pr oxides wherein said thin film of Pr oxides is a sputtered film or an evaporated film, (ii) composite oxides of Pr-Mn wherein said thin film said Pr-Mn composite oxides have a Pr/Pr+Mn atom ratio of at least 0.35, (iii) composite oxides of Pr-Co wherein said thin film said Pr-Co composite oxides have a Pr/Pr+Co atom ratio of ranging from 0.1 to 0.6, and (iv) composite oxides of Pr-Ni wherein said thin film said Pr-Ni composite oxides have a Pr/Pr+Ni atom ratio ranging from 0.2 to 0.7 a back electrode formed on said thin insulator film.
Claim 2
Dependent Claim
144 words
A thin film EL panel comprising: a transparent electrode film, a phosphor film formed above said transparent electrode film, a thin insulator film formed on said phosphor film and at least a part thereof is a thin film of an oxide selected from the group consisting of (i) Pr oxides wherein said thin film of Pr oxides is a sputtered film or an evaporated film, (ii) composite oxides of Pr-Mn wherein said thin film said Pr-Mn composite oxides have a Pr/Pr+Mn atom ratio of at least 0.35, (iii) composite oxides of Pr-Co wherein said thin film said Pr-Co composite oxides have a Pr/Pr+Co atom ratio of ranging from 0.1 to 0.6, and (iv) composite oxides of Pr-Ni wherein said thin film said Pr-Ni composite oxides have a Pr/Pr+Ni atom ratio ranging from 0.2 to 0.7 a back electrode formed on said thin insulator film.
Claim 3
Dependent Claim
18 words
A thin film El panel according to claim 1 wherein said oxides is a composite oxide of Pr.
Claim 4
Dependent Claim
17 words
A thin film EL panel according to claim 1 wherein said oxides are composite oxides of Pr-Ni.
Claim 5
Dependent Claim
17 words
A thin film EL panel according to claim 1 wherein said oxides are composite oxides of Pr-Co.
Claim 6
Dependent Claim
17 words
A thin film EL panel according to claim 1 wherein said oxides are composite oxides of Pr-Mn.
Claim 7
Dependent Claim
24 words
A thin film EL panel according to claim 1 wherein said oxides are composite oxides of Pr 6 O 11 and PrO 2 .
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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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |