US4590128A
Expired / Lapsed
US
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Thin film EL element
Assignee: Hoya Corp
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Filing: 1985-02-22
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Granted: 1986-05-20
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Expires: 2005-02-22
Abstract
Abstract An electroluminescence element has a luminescence layer sandwiched between a transparent electrode and a back electrode so as to generate luminescence upon an application of an electric field between the transparent and back electrodes, wherein a light reflector is arranged behind the back electrode, and a light absorber is arranged at a side of a light extraction side of the electroluminescence element.
Inventors
- 👤 Hisao Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:24
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/22; H05B33/24; Y; Y10; Y10S; Y10S428/00; Y10S428/917; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
An electroluminescense element having a luminescence layer sandwiched between tranparent electrodes and back electrodes formed on a transparent substrate respectively in the form of a matrix, so as to generate luminescence upon the application of an electric field between said transparent electrodes and back electrodes, wherein a light reflector for reflecting light passing between adjacent back electrodes is arranged behind said back electrodes, and a light absorber for absorbing visible, reflected light of said electroluminiescence element is arranged on the light extracting side of said transparent electrodes.
Claim 2
Dependent Claim
87 words
An electroluminescense element having a luminescence layer sandwiched between tranparent electrodes and back electrodes formed on a transparent substrate respectively in the form of a matrix, so as to generate luminescence upon the application of an electric field between said transparent electrodes and back electrodes, wherein a light reflector for reflecting light passing between adjacent back electrodes is arranged behind said back electrodes, and a light absorber for absorbing visible, reflected light of said electroluminiescence element is arranged on the light extracting side of said transparent electrodes.
Claim 3
Dependent Claim
67 words
An element according to claim 1 wherein a visible light reflectance of said light reflector is substantially the same as that of a region with said back electrodes when viewed from the side of said transparent electrodes, a transmittance of said light absorber falls within a range between 10% and 70%, and a wavelength dispersion of transmittance of the visible light falls within a range of ±10%.
Claim 4
Dependent Claim
14 words
An element according to claim 2, wherein said light reflector comprises a metal plate.
Claim 5
Dependent Claim
14 words
An element according to claim 2, wherein said light absorber comprises a plastic material.
Claim 6
Dependent Claim
31 words
An element according to claim 2, wherein said light absorber comprises a glass substrate and at least one dielectric layer formed on at least one major surface of said glass substrate.
Claim 7
Dependent Claim
68 words
An element according to claim 5, wherein said glass substrate comprises an alkali metal oxide with iron and cobalt, and said at least one dielectric layer is constituted by either a single layer consisting of one of magnesium fluoride and silicon dioxide or at least two layers consisting of at least two materials selected from the group consisting of magnesium fluoride, silicon dioxide, titanium dioxide and hafnium oxide.
Claim 8
Dependent Claim
32 words
An element according to claim 2, wherein said light absorber comprises a glass substrate and a thin light-absorbing film formed on at least one of two major surfaces of said glass substrate.
Claim 9
Dependent Claim
39 words
An element according to claim 7, wherein said glass substrate comprises an alkali metal oxide with iron and cobalt, and said thin light-absorbing film comprises at least one material selected from the group consisting of lead-tellurium, cadmium-tellurium and carbon.
Claim 10
Dependent Claim
45 words
An element according to claim 2, wherein said light reflector comprises a sealing plate disposed above said transparent substrate with an intervening adhesive means for a sealing purpose, and a metal film for reflection formed on at least one major surface of said sealing plate.
Claim 11
Dependent Claim
27 words
An element according to claim 9, wherein said reflecting metal film comprises a metal selected from the group consisting of chrome, tantalum, nickel, nickel-chrome, molybdenum and aluminum.
Claim 12
Dependent Claim
26 words
An element according to claim 1, wherein said sealing plate comprises a member selected from the group consisting of a multicomponent glass and a quartz glass.
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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |