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US3575634A
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Luminescent display device
Assignee: Panasonic Holdings Corp
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Filing: 1968-01-25
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Granted: 1971-04-20
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Expires: 1988-01-25
Abstract
Abstract A luminescent display device comprising an electroluminescent element; an energy-responsive element (for example, a photoelectroconductive element) connected in series to said electroluminescent element so that said energy-responsive element controls the bias voltage to said electroluminescent element in response to input energy, thereby controlling the luminescent output from said device; and means for selectively separating a portion of the wave form of the luminescent output, thereby to increase the sensitivity of said device and to make the luminescent output controllable.
Inventors
- 👤 Tadao Kohashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:10
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
35 words
A luminescent display device as defined in claim 1, wherein said means for controlling said DC voltage is an energy-responsive element, and said AC voltage is applied to said electroluminescent element through a capacitive element.
Claim 2
Dependent Claim
33 words
A luminescent display device as defined in claim 1, wherein is provided means for controlling at least either one of the width and the position of the sampling performed by said sampling means.
Claim 3
Dependent Claim
47 words
A luminescent display device as defined in claim 1, wherein a power source for generating said AC voltage is connected with said sampling means in such a manner that the frequency of said AC voltage is determined on the basis of the operation of said sampling means.
Claim 4
Dependent Claim
23 words
A luminescent display device as defined in claim 1, wherein said sampling means comprises a mechanical light chopper driven by a synchronous motor.
Claim 5
Dependent Claim
27 words
A luminescent display device as defined in claim 1, wherein said means for applying a DC voltage includes means for reversing the polarity of said DC voltage.
References Cited (Backward Citations)
US3107314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |