US4634639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent panel having a light absorption layer of germanium oxide
Assignee: Hoya Corp
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Filing: 1985-04-29
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Granted: 1987-01-06
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Expires: 2005-04-29
Abstract
Abstract In an electroluminescent panel comprising a transparent electrode, a back electrode, an electroluminescent layer between the transparent and the back electrodes, and a light absorption layer between the electroluminescent layer and the back electrode, the light absorption layer comprises a lower-order oxide of germanium and has a light absorption coefficient which is not smaller than 3.3×10 -4 cm -1 . The light absorption coefficient may be discretely or continuously increased from an electroluminescent layer side towards a back electrode side. The light absorption layer may be selectively deposited under the back electrode when it has a low resistivity.
Inventors
- 👤 Hisao Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:08
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
An electroluminescent panel comprising: a transparent electrode; a back electrode opposite to said transparent electrode; an electroluminescent layer laid between said transparent and said back electrodes for emitting electroluminescent light; and a light absorption layer between said back electrode and said electroluminescent layer, said light absorption layer essentially consisting of a lower-order oxide of germanium represented by GeO x where x represents a positive number which is smaller than two.
Claim 2
Dependent Claim
70 words
An electroluminescent panel comprising: a transparent electrode; a back electrode opposite to said transparent electrode; an electroluminescent layer laid between said transparent and said back electrodes for emitting electroluminescent light; and a light absorption layer between said back electrode and said electroluminescent layer, said light absorption layer essentially consisting of a lower-order oxide of germanium represented by GeO x where x represents a positive number which is smaller than two.
Claim 3
Dependent Claim
34 words
An electroluminescent panel as claimed in claim 1, wherein said light absorption layer has a light absorption coefficient which is not smaller than 3.3×10 4 cm -1 for the electroluminescent light of 580 nm.
Claim 4
Dependent Claim
45 words
An electroluminescent panel as claimed in claim 1, wherein said light absorption layer has a first surface directed towards said electroluminescent layer, a second surface directed towards said back electrode, and a light absorption coefficient which increases from said first surface to said second surface.
Claim 5
Dependent Claim
24 words
An electroluminescent panel as claimed in claim 3, wherein said light absorption coefficient is continuously varied from said first surface to said second one.
Claim 6
Dependent Claim
24 words
An electroluminescent panel as claimed in claim 3, wherein said light absorption coefficient is discretely varied from said first surface to said second surface.
Claim 7
Dependent Claim
36 words
An electroluminescent panel as claimed in claim 3, wherein said light absorption layer comprises a first and a second film which have said first and said second surfaces, respectively, and are in contact with each other.
Claim 8
Dependent Claim
35 words
An electroluminescent panel as claimed in claim 3, wherein: said back electrode comprises a plurality of conductors; said light absorption layer comprising a plurality of partial absorption layers selectively formed only under said conductors, respectively.
Claim 9
Dependent Claim
41 words
An electroluminescent panel as claimed in claim 7, further comprising: an etching resistant dielectric layer which is between said back electrode and said light absorption layer and which is capable of withstanding an etchant used in forming said partial absorption layers.
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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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |