Patent US4635052A successfully refreshed from Google Patents.
US4635052A
Expired / Lapsed
US
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Large size image display apparatus
Assignee: Toshiba Denzai KK
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Filing: 1983-07-25
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Granted: 1987-01-06
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Expires: 2003-07-25
Abstract
Abstract A large number of luminous display elements are arrayed on a board, and the quantity of light emitted by each display element is controlled in accordance with a video signal generated by a video signal generator. Each display element is constituted by a discharge lamp and a high frequency generator lighting the same.
Inventors
- 👤 Nanjou Aoike
- 👤 Katsuyuki Ide
- 👤 Hisao Kobayashi
- 👤 Mitsuhiro Hamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:24
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N5/00; H04N5/66
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
116 words
Image display apparatus comprising: a display board on which a plurality of luminous elements are arrayed; means for generating a video signal indicative of a video image to be displayed by said display board; control means responsive to said video signal for generating control signals establishing periods of lighting of said respective luminous elements required to produce an intensity corresponding to said video signal; each of said display elements comprising a low pressure gas discharge lamp; and high frequency generator means controlled by said control means for supplying high frequency power to said low pressure gas discharge lamps, said frequency being sufficiently high to decrease an attenuation time of a transient oscillation of said display elements.
Claim 2
Dependent Claim
116 words
Image display apparatus comprising: a display board on which a plurality of luminous elements are arrayed; means for generating a video signal indicative of a video image to be displayed by said display board; control means responsive to said video signal for generating control signals establishing periods of lighting of said respective luminous elements required to produce an intensity corresponding to said video signal; each of said display elements comprising a low pressure gas discharge lamp; and high frequency generator means controlled by said control means for supplying high frequency power to said low pressure gas discharge lamps, said frequency being sufficiently high to decrease an attenuation time of a transient oscillation of said display elements.
Claim 3
Dependent Claim
29 words
The image display apparatus according to claim 1 wherein three discharge lamps respectively emitting red, green and blue color lights are disposed closely adjacent to form one picture element.
Claim 4
Dependent Claim
26 words
The image display apparatus according to claim 1 wherein said high frequency generator generates a high frequency voltage having a frequency of 20 to 50 KHz.
Claim 5
Dependent Claim
19 words
The image display apparatus according to claim 1 wherein said high frequency generator is provided for each discharge lamp.
Claim 6
Dependent Claim
21 words
The image display apparatus according to claim 1 wherein said high frequency generator is provided for two or more discharge lamps.
Claim 7
Dependent Claim
46 words
The image display apparatus according to claim 1 wherein said high frequency generator comprises a rectifier for rectifying voltage of a commercial alternating current source to produce a rectified voltage signal, and an inverter which converts said rectified voltage signal into a high frequency AC voltage.
Claim 8
Dependent Claim
50 words
The image display apparatus according to claim 1 wherein said control menas includes means for varying an interval in which output of said high frequency generator is supplied to said discharge lamp at each frame of the video image represented by said video signal generated by said video signal generator.
Claim 9
Dependent Claim
51 words
The image display apparatus according to claim 1 wherein said control means includes means for varying a magnitude of the output voltage of said high frequency generator in accordance with said video signal at each frame of said video image represented by said video signal generated by said video signal generator.
Claim 10
Dependent Claim
19 words
The image display apparatus according to claim 1 wherein said high frequency generator comprises a self exciting type inverter.
Claim 11
Dependent Claim
19 words
The image display apparatus according to claim 1 wherein said high frequency generator comprises a separate exciting type inverter.
Claim 12
Dependent Claim
29 words
The image display apparatus according to claim 1 wherein said high frequency generator comprises control means for starting and stopping the operation thereof in accordance with said video signal.
Claim 13
Dependent Claim
25 words
The image display according to claim 1, wherein the frequency of the high frequency generator means is substantially greater than frequency of the video signal.
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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 |