US4412155A
Expired / Lapsed
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Aging method for thin-film electroluminescent display element
Assignee: Sharp Corp
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Filing: 1981-06-18
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Granted: 1983-10-25
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Expires: 2001-06-18
Abstract
Abstract An aging method for a thin-film electroluminescent display element comprises the steps of applying an AC voltage having at least one characteristic selected from the features that its frequency is approximately within 500 Hz through 10 KHz, its pulse width is approximately within 20 μsec through 100 μsec, and its voltage is of a magnitude, at which a virgin thin-film electroluminescent display element starts to emit electroluminescence, plus 30 V through 60 V.
Inventors
- 👤 Kinichi Isaka
- 👤 Masashi Kawaguchi
- 👤 Hisashi Uede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:31
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
36 words
A method for aging a thin-film electroluminescent display element comprising the steps of: applying an AC voltage to electrode means of the element, the frequency of the AC voltage being approximately 500 Hz through 10 KHz.
Claim 2
Independent Claim
36 words
A method for aging a thin-film electroluminescent display element comprising the steps of: applying an AC voltage to electrode means of the element, the frequency of the AC voltage being approximately 500 Hz through 10 KHz.
Claim 3
Dependent Claim
15 words
The method of claim 1, wherein the frequency is approximately 500 Hz through 2.5 KHz.
Claim 4
Dependent Claim
37 words
An aging method for a thin-film electroluminescent display element comprising the steps of: applying an AC voltage to electrode means of the element, the pulse width of the AC voltage being approximately 20 μsec through 100 μsec.
Claim 5
Dependent Claim
37 words
An aging method for a thin-film electroluminescent display element comprising the steps of: applying an AC voltage to electrode means of the element, the pulse width of the AC voltage being approximately 20 μsec through 100 μsec.
Claim 6
Dependent Claim
16 words
The method of claim 3, wherein the pulse width is approximately 40 μsec through 70 μsec.
Claim 7
Dependent Claim
51 words
An aging method for a thin-film electroluminescent display element comprising the steps of: applying an AC voltage to electrode means of the element, wherein the magnitude of the AC voltage is approximately at which a virsin thin-film electroluminescent display element starts to emit electroluminescense plus 30 V to voltage 60 V.
Claim 8
Dependent Claim
51 words
An aging method for a thin-film electroluminescent display element comprising the steps of: applying an AC voltage to electrode means of the element, wherein the magnitude of the AC voltage is approximately at which a virsin thin-film electroluminescent display element starts to emit electroluminescense plus 30 V to voltage 60 V.
Claim 9
Dependent Claim
19 words
The method of claim 5, wherein the magnitude of the AC voltage is approximately 180 V through 210 V.
Claim 10
Dependent Claim
79 words
An aging method for a thin-film electroluminescent display element comprising the steps of: applying an AC voltage to electrode means of the element, the frequency of the AC voltage being approximately 500 Hz through 10 KHz, the pulse width of the AC voltage being approximately 20 μsec through 100 μsec, and the magnitude of the AC voltage being approximately the voltage at which a virgin thin-film electroluminescent display element starts to emit electroluminescence plus 30 V to 60 V.
Claim 11
Dependent Claim
79 words
An aging method for a thin-film electroluminescent display element comprising the steps of: applying an AC voltage to electrode means of the element, the frequency of the AC voltage being approximately 500 Hz through 10 KHz, the pulse width of the AC voltage being approximately 20 μsec through 100 μsec, and the magnitude of the AC voltage being approximately the voltage at which a virgin thin-film electroluminescent display element starts to emit electroluminescence plus 30 V to 60 V.
Claim 12
Dependent Claim
13 words
The method of claim 7, wherein the AC voltage has a rectangular waveform.
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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |