EP0103982A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Display control device
Assignee: Sharp Corp
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Filing: 1983-08-15
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Granted: —
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Expires: 2003-08-15
Abstract
Abstract A cathode-ray tube control device is disclosed which displays data obtained from a personal computer on the screen of a television receiver in superimposing relation to the picture of a broadcast. Clock pulses are generated, and these are counted in synchronism with the horizontal and vertical synchronizing signals from the television receiver. Display timing signals including horizontal scanning display period signal, horizontal retrace period signal, vertical scanning display period signal, and vertical retrace period signal are delivered in response to the resultant counts. Then, read-out of data to be displayed is controlled in accordance with the produced timing signals, and the read data is displayed on the screen such that it is superimposed on the picture of a television broadcast.
Inventors
- 👤 Haruki Ishimochi
- 👤 Kimio Yamamura
- 👤 Yuji Fukuyama
- 👤 Masato Yanai
- 👤 Satoshi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 21:50
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/02; G09G5/022; G06; G06F; G06F3/00; G06F3/14; G06F3/153; G09G1/00; G09G1/06; G09G1/14; G09G1/16; G09G5/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
117 words
A cathode-ray tube control device for connecting a personal computer with a television receiver to superimpose information obtained from the computer on the picture of a television broadcast, the control device comprising: means for storing data to be displayed, an oscillator means for producing clock signals in synchronism with the horizontal and vertical synchronizing signals from the television receiver, means for delivering timing signals defining horizontal scanning display period, horizontal scanning retrace period, vertical scanning display period, and vertical retrace period by counting the clock signals from the oscillator means, and a means for controlling the read-out of data to be displayed in accordance with the timing signals and for supplying the data to the television receiver.
Claim 2
Dependent Claim
117 words
A cathode-ray tube control device for connecting a personal computer with a television receiver to superimpose information obtained from the computer on the picture of a television broadcast, the control device comprising: means for storing data to be displayed, an oscillator means for producing clock signals in synchronism with the horizontal and vertical synchronizing signals from the television receiver, means for delivering timing signals defining horizontal scanning display period, horizontal scanning retrace period, vertical scanning display period, and vertical retrace period by counting the clock signals from the oscillator means, and a means for controlling the read-out of data to be displayed in accordance with the timing signals and for supplying the data to the television receiver.
Claim 3
Dependent Claim
128 words
A cathode-ray tube control device as set forth in claim 1, wherein the timing signal delivering means comprises a means for counting the clock signals such that the number of dots of picture elements arrayed during each of the horizontal scanning display periods differs from the number of dots of picture elements arrayed during each of the horizontal retrace periods so that the total number of dots of picture elements arrayed horizontally on the screen has a predetermined relation to the chrominance subcarrier frequency in order that one picture element is made up of a predetermined number of dots arrayed horizontally and a predetermined number of dots arrayed vertically and that such picture elements are arrayed horizontally on the screen of the television receiver to form one picture.
Claim 4
Dependent Claim
144 words
A cathode-ray tube control device for connecting a personal computer with a television receiver to superimpose information obtained from the computer on the picture of a television broadcast, the control device comprising: means for storing data to be displayed, an oscillator means for producing clock signals in synchronism with the horizontal and vertical synchronizing signals from the television receiver, means for delivering display timing signals including horizontal scanning display period signal, horizontal retrace period signal, vertical scanning display period signal, and vertical retrace period signal by counting the clock signals from the oscillator means, a means for delivering said vertical retrace period signal in accordance with both said display timing signals and said clock signals, and a means for controlling the read-out of data to be displayed in accordance with said vertical retrace period signal and for supplying the data to the television receiver.
Claim 5
Dependent Claim
144 words
A cathode-ray tube control device for connecting a personal computer with a television receiver to superimpose information obtained from the computer on the picture of a television broadcast, the control device comprising: means for storing data to be displayed, an oscillator means for producing clock signals in synchronism with the horizontal and vertical synchronizing signals from the television receiver, means for delivering display timing signals including horizontal scanning display period signal, horizontal retrace period signal, vertical scanning display period signal, and vertical retrace period signal by counting the clock signals from the oscillator means, a means for delivering said vertical retrace period signal in accordance with both said display timing signals and said clock signals, and a means for controlling the read-out of data to be displayed in accordance with said vertical retrace period signal and for supplying the data to the television receiver.
Claim 6
Dependent Claim
39 words
A cathod-ray tube control device as set forth in claim 3, wherein the storing means are comprised of at least three image memories for respectively storing red picture element data, green picture element data, and blue picture element data.
Claim 7
Dependent Claim
43 words
A cathode-ray tube control device as set forth in claim 4, further comprising a means for delivering address signals, and a means for simultaneously specifying addresses of at least two of the at least three image memories in response to the address signals.
Claim 8
Dependent Claim
110 words
A cathode-ray tube display device comprising: a horizontal oscillator'circuit for producing horizontal pulses to effect horizontal deflecting scan in a cathode-ray tube, a first counter for dividing the horizontal pulses down into vertical pulses for vertical deflecting scan in the cathode-ray tube, an image memory capable of storing image information equivalent to at least one picture of the screen, and a second counter for dividing the horizontal ..pulses down into a timing signal for access to the image memory with a submultiple of frequency division slightly different from that of the first counter, whereby the image information displayed on the screen of the cathode-ray tube can be scrolled as needed.
Claim 9
Dependent Claim
110 words
A cathode-ray tube display device comprising: a horizontal oscillator'circuit for producing horizontal pulses to effect horizontal deflecting scan in a cathode-ray tube, a first counter for dividing the horizontal pulses down into vertical pulses for vertical deflecting scan in the cathode-ray tube, an image memory capable of storing image information equivalent to at least one picture of the screen, and a second counter for dividing the horizontal ..pulses down into a timing signal for access to the image memory with a submultiple of frequency division slightly different from that of the first counter, whereby the image information displayed on the screen of the cathode-ray tube can be scrolled as needed.
Claim 10
Dependent Claim
119 words
A display device comprising displaying means (33) and a drive circuit (31) which is operable to receive a video signal and to derive from the video signal timing signals which are used to control the scanning of the displaying means (33) and a picture signal which defines an image to be displayed by the displaying means (33), characterised in that the drive circuit (31) is responsive to the timing signals for providing output signals which can be used to control the reading-out of display data in a memory for generating a display signal, the drive circuit-(31) being further operable to combine the display signal with the picture signal and to deliver the combined signal to the displaying means (33).
Claim 11
Dependent Claim
119 words
A display device comprising displaying means (33) and a drive circuit (31) which is operable to receive a video signal and to derive from the video signal timing signals which are used to control the scanning of the displaying means (33) and a picture signal which defines an image to be displayed by the displaying means (33), characterised in that the drive circuit (31) is responsive to the timing signals for providing output signals which can be used to control the reading-out of display data in a memory for generating a display signal, the drive circuit-(31) being further operable to combine the display signal with the picture signal and to deliver the combined signal to the displaying means (33).
Claim 12
Dependent Claim
17 words
A device as claimed in claim 7, wherein the displaying means (33) comprises a cathode ray tube.
Claim 13
Dependent Claim
39 words
A combination of a display device as claimed in claim 7 or claim 8 and a computer, the computer comprising said memory and being operable to deliver output information to the memory for display on said displaying means (33).
References Cited (Backward Citations)
No citation records indexed.
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