US4547703A
Expired / Lapsed
US
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Thin film electroluminescent element
Assignee: Panasonic Holdings Corp
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Filing: 1983-05-26
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Granted: 1985-10-15
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Expires: 2003-05-26
Abstract
Abstract In a thin film electroluminescent element comprising a phosphor thin film, a dielectric thin film disposed on at least one of the surfaces of the phosphor thin film and electrodes for applying a voltage across the thin films, the aforementioned dielectric thin film is formed of a dielectric material expressed by a general formula of AB 2 O 6 (where A represents a divalent metal element and B represents a pentavalent metal element). By employing the dielectric material, the voltage for driving a thin film electroluminescent element can be lowered without decreasing the brightness of the element. Further, by using a composite dielectric thin film in which the dielectric thin film expressed by the aforementioned general formula AB 2 O 6 is laminated with a dielectric thin film which is not susceptible to dielectric breakdown of self-healing type, the composite dielectric thin film is made susceptible to the dielectric breakdown of self-healing type. Additionally, the value of product of the dielectric breakdown field intensity and dielectric constant is increased to obtain a thin film electroluminescent element having excellent characteristics.
Inventors
- 👤 Yosuke Fujita
- 👤 Takao Tohda
- 👤 Tomizo Matsuoka
- 👤 Atsushi Abe
- 👤 Tsuneharu Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:21
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/22; H01; H01B; H01B3/00; H01B3/02; H01B3/12; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
140 words
A thin film electroluminescent element comprising a phosphor thin film, a dielectric thin film disposed on at least one surface of said phosphor thin film, and electrodes for applying a voltage across said films, wherein said dielectric thin film comprises a dielectric material subject to dielectric breakdown of the self-healing type having a composition expressed by the general formula of AB 2 O 6 , where A is at least one divalent metal element selected from the group consisting of Pb, Sn, Mg, Ca, Sr, Ba, Zn and Cd, and B is at least one pentavalent metal element selected from the group consisting of Ta and Nb, wherein the product E b ·ε.sub.γ of the dielectric breakdown electric field intensity E b and dielectric constant ε.sub.γ for the dielectric thin film is greater than or equal to 80×10 6 V/cm.
Claim 2
Dependent Claim
140 words
A thin film electroluminescent element comprising a phosphor thin film, a dielectric thin film disposed on at least one surface of said phosphor thin film, and electrodes for applying a voltage across said films, wherein said dielectric thin film comprises a dielectric material subject to dielectric breakdown of the self-healing type having a composition expressed by the general formula of AB 2 O 6 , where A is at least one divalent metal element selected from the group consisting of Pb, Sn, Mg, Ca, Sr, Ba, Zn and Cd, and B is at least one pentavalent metal element selected from the group consisting of Ta and Nb, wherein the product E b ·ε.sub.γ of the dielectric breakdown electric field intensity E b and dielectric constant ε.sub.γ for the dielectric thin film is greater than or equal to 80×10 6 V/cm.
Claim 3
Dependent Claim
29 words
A thin film electroluminescent element according to claim 1, wherein the divalent metal element A is at least one selected from a group consisting of Pb, Sr and Ba.
Claim 4
Dependent Claim
17 words
A thin film electroluminescent element according to claim 1, wherein the divalent metal element A is Pb.
Claim 5
Dependent Claim
97 words
A thin film electroluminescent element comprising a phosphor thin film, a dielectric thin film disposed on at least one surface of said phosphor thin film, and electrodes for applying a voltage across said films, wherein said dielectric thin film comprises a dielectric material having a composition expressed by the general formula of AB 2 O 6 , wherein A is at least one divalent metal selected from a group consisting of Pb, Sn, Mg, Ca, Sr, Ba, Zn and Cd, and B is at least one pentavalent metal selected from the group consisting of Ta and Nb.
Claim 6
Dependent Claim
97 words
A thin film electroluminescent element comprising a phosphor thin film, a dielectric thin film disposed on at least one surface of said phosphor thin film, and electrodes for applying a voltage across said films, wherein said dielectric thin film comprises a dielectric material having a composition expressed by the general formula of AB 2 O 6 , wherein A is at least one divalent metal selected from a group consisting of Pb, Sn, Mg, Ca, Sr, Ba, Zn and Cd, and B is at least one pentavalent metal selected from the group consisting of Ta and Nb.
Claim 7
Dependent Claim
29 words
A thin film electroluminescent element according to claim 4, wherein the divalent metal element A is at least one selected from a group consisting of Pb, Sr and Ba.
Claim 8
Dependent Claim
16 words
A thin film electroluminescent element according to claim 5, wherein the divalent metal element is Pb.
Claim 9
Dependent Claim
155 words
A thin film electroluminescent element comprising a phosphor thin film, a dielectric thin film disposed on at least one surface of said phosphor thin film, and electrodes for applying a voltage across said films, wherein the dielectric thin film comprises a first dielectric thin film layer which is subject to dielectric breakdown of the self-healing type, expressed by the general formula of AB 2 O 6 where A represents a divalent metal element selected from the group consisting of Pb, Sn, Mg, Ca, Sr, Ba, Zn and Cd, and B represents a pentavalent metal element selected from the group consisting of Ta and Nb, and a second dielectric thin film layer superimposed thereon, wherein said second dielectric thin film has a product E b ·ε.sub.γ of dielectric breakdown electric field intensity E b and dielectric constant ε.sub.γ not smaller than 80×10 6 V/cm and is not susceptible to a dielectric breakdown of the self-healing type.
Claim 10
Dependent Claim
155 words
A thin film electroluminescent element comprising a phosphor thin film, a dielectric thin film disposed on at least one surface of said phosphor thin film, and electrodes for applying a voltage across said films, wherein the dielectric thin film comprises a first dielectric thin film layer which is subject to dielectric breakdown of the self-healing type, expressed by the general formula of AB 2 O 6 where A represents a divalent metal element selected from the group consisting of Pb, Sn, Mg, Ca, Sr, Ba, Zn and Cd, and B represents a pentavalent metal element selected from the group consisting of Ta and Nb, and a second dielectric thin film layer superimposed thereon, wherein said second dielectric thin film has a product E b ·ε.sub.γ of dielectric breakdown electric field intensity E b and dielectric constant ε.sub.γ not smaller than 80×10 6 V/cm and is not susceptible to a dielectric breakdown of the self-healing type.
Claim 11
Dependent Claim
39 words
A thin film electroluminescent element according to claim 7, wherein the second dielectric thin film, not susceptible to the dielectric breakdown of the self-healing type, is formed from a dielectric material containing perovskite type titanate as a main component.
Claim 12
Dependent Claim
29 words
A thin film electroluminescent element according to claim 4, wherein the divalent metal element A is at least one selected from a group consisting of Pb, Sr and Ba.
Claim 13
Dependent Claim
16 words
A thin film electroluminescent element according to claim 9, wherein the divalent metal element is Pb.
Claim 14
Dependent Claim
29 words
A thin film electroluminescent element according to claim 7, wherein the divalent metal element A is at least one selected from a group consisting of Pb, Sr and Ba.
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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) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |