Patent US4145685A successfully refreshed from Google Patents.
US4145685A
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Image display devices
Assignee: SKEPSY SA
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Filing: 1977-08-09
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Granted: 1979-03-20
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Expires: 1997-08-09
Abstract
Abstract An image display device comprising a plurality of elements which can be made luminous is described. The elements are arranged in a matrix formed by rows and columns, and each column of the matrix is piloted by as many outputs of a delay line of the charge displacement type, fed by a video signal representative, for lines, of the image to be reproduced and by a clock signal. The main feature of the device is that the delay of the line is substantially equal to the effective duration of information in one line of the video signal, and that there are provided means for interrupting the passage of the clock signal to the delay line during a substantial period of time within the line blanking interval of the video signal, so that during the said period the status of the charges in the delay line remains unchanged, and said status is utilized to render luminous a row of the elements.
Inventors
- 👤 Attilio Farina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:08
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
An image display device, comprising a plurality of elements which can be made luminous, arranged in a matrix formed by rows and columns, in which each column of the matrix is piloted by as many outputs of a single delay line of the charge displacement type, which delay line is fed by a video signal representative, for lines, of the image to be reproduced, and by a clock signal, the delay of said line being substantially equal to the effective duration of information in one line of said video signal, and there being provided means for interrupting the passage of the clock signal to said delay line for a time which substantially corresponds to the line blanking interval of said video signal, so that during said time the status of the charges in said delay line remains unchanged, said unchanged charge status being utilized to render luminous a row of said elements.
Claim 2
Dependent Claim
152 words
An image display device, comprising a plurality of elements which can be made luminous, arranged in a matrix formed by rows and columns, in which each column of the matrix is piloted by as many outputs of a single delay line of the charge displacement type, which delay line is fed by a video signal representative, for lines, of the image to be reproduced, and by a clock signal, the delay of said line being substantially equal to the effective duration of information in one line of said video signal, and there being provided means for interrupting the passage of the clock signal to said delay line for a time which substantially corresponds to the line blanking interval of said video signal, so that during said time the status of the charges in said delay line remains unchanged, said unchanged charge status being utilized to render luminous a row of said elements.
Claim 3
Dependent Claim
25 words
The device of claim 1, wherein said unchanged charge status is utilized to render luminous said row for the duration of said line blanking interval.
Claim 4
Dependent Claim
60 words
The device of claim 1, wherein each row of the matrix is piloted by as many outputs of a shift register, said shift register receiving a pulse signal which is repeated at vertical scanning frequency of said matrix and with a duration not longer than one scanning line of the video signal, and a clock signal at line repetition frequency.
Claim 5
Dependent Claim
39 words
The device of claim 3, wherein there is comprised change-over means for establishing the connection between rows of the matrix and said shift register only for a period of time within the line blanking interval of said video signal.
Claim 6
Dependent Claim
30 words
The device of claim 4, wherein said change-over means comprise a plurality of logic AND gates arranged between the outputs of said shift register and the rows of said matrix.
Claim 7
Dependent Claim
52 words
The device of claim 4, wherein at said means for interrupting the passage of the clock signal to said delay line, and at said change-over means there arrive control signals at line frequency and having such a duration and phase that they correspond to the line blanking interval of said video signal.
Claim 8
Dependent Claim
107 words
The image display device of claim 1, wherein the outputs of said delay line are connected to a memory device having a plurality of cells one for each output of the delay line, the memory device being fed with a control signal, synchronized with the video signal fed to the delay line and operating to control the feeding of the output signals from the delay line to the memory device during each line blanking interval of the video signal, the memory device then feeding the signals to the columns of the matrix during at least a part of the scanning period of one of the next lines.
Claim 9
Dependent Claim
57 words
The device of claim 7, wherein said control signal is at line frequency, arrives at said memory device, and arrives also at said means for interrupting the passage of the clock signal to said delay line; said control signal having such a duration and phase that it corresponds to the line blanking interval of said video signal.
Claim 10
Dependent Claim
51 words
The device of claim 1, wherein said means for interrupting the passage of the clock signal to said delay line comprise a change-over device connected on the path of said clock signal towards said delay line, the opening and the closure of said change-over device being controlled by a control signal.
Claim 11
Dependent Claim
16 words
The device of claim 1, wherein the device is included in a television image display apparatus.
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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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |