US3742288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Raster control device for controlling the positioning of the raster at the beginning of each new line
Assignee: Bunker Ramo Corp
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Filing: 1971-09-08
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Granted: 1973-06-26
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Expires: 1991-09-08
Abstract
Abstract A circuit for controlling the raster of a cyclically scanned display device such as a cathode ray tube (CRT). The circuit may control both the horizontal and vertical positioning of the raster at the beginning of each new line of the display. The line positioning control responds to predetermined sync pulse patterns generated in response to detected raster position, data type, or other conditions. The raster may advance a predetermined number of full or partial line positions in response to a received sync pulse pattern, for example a single sync pulse, and may advance an additional like number of full or partial line positions in response to a variation in the received sync pattern, such as for example the receipt of additional sync pulses. The horizontal position at which each line of the display commences is controlled by a circuit which is operative in response to variations in the received sync pulse pattern for altering the line starting position.
Inventors
- 👤 F Albrecht
- 👤 W Baxter
- 👤 C Greenblum
- 👤 S Grosky
- 👤 Michiel J De
- 👤 R Duggan
- 👤 A Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:51
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/04; G09G1/06; G09G1/14; G09G5/00; G09G5/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
122 words
A circuit for controlling the movement of a multiline raster on a cyclically scanned display device comprising: means for incrementing said raster from line to line in steps of predetermined size; means for indicating the number of steps by which said raster is to be incremented between each two lines of said raster; means normally operative for generating a first predetermined sync pulse pattern between raster lines; means responsive to an indication from said indicating means that more than one step is required for generating a different sync pulse pattern for each number of steps required; and control means responsive to each of said sync pulse patterns for causing said incrementing means to increment said raster by the required number of steps.
Claim 2
Dependent Claim
122 words
A circuit for controlling the movement of a multiline raster on a cyclically scanned display device comprising: means for incrementing said raster from line to line in steps of predetermined size; means for indicating the number of steps by which said raster is to be incremented between each two lines of said raster; means normally operative for generating a first predetermined sync pulse pattern between raster lines; means responsive to an indication from said indicating means that more than one step is required for generating a different sync pulse pattern for each number of steps required; and control means responsive to each of said sync pulse patterns for causing said incrementing means to increment said raster by the required number of steps.
Claim 3
Dependent Claim
43 words
A circuit of the type described in claim 1 wherein said indicating means includes means for detecting various display data type, raster position, and/or other conditions; and means responsive to the detected conditions for generating a signal representing the number of incrementing steps.
Claim 4
Dependent Claim
76 words
A circuit of the type described in claim 1 wherein said means for generating a first predetermined sync pulse pattern includes means for generating a single sync pulse; wherein said means for generating different sync pulse patterns includes means for generating an additional sync pulse for each additional step required; and wherein said control means includes means responsive to each of said sync pulses for causing said incrementing means to increment said raster by one step.
Claim 5
Dependent Claim
24 words
A circuit of the type described in claim 3 wherein each of said sync pulses follows a preceding pulse by a predetermined time interval.
Claim 6
Dependent Claim
34 words
A circuit of the type described in claim 3 wherein each of said sync pulses is of predetermined duration; and wherein said control means includes means for detecting sync pulses of said predetermined duration.
Claim 7
Dependent Claim
48 words
A circuit of the type described in claim 3 wherein said control means includes a single-shot the duration of which is less than the time between sync pulses, said incrementing means being operative to increment the raster by one step in response to each setting of said single-shot.
Claim 8
Dependent Claim
59 words
A circuit of the type described in claim 1 including means for controlling the horizontal position at which each line of said raster begins; means for detecting selected display data type, raster position, and/or other conditions; and means responsive to said detected conditions for altering the position at which said position controlling means initiates a line of the display.
Claim 9
Dependent Claim
33 words
A circuit of the type described in claim 7 wherein said position altering means includes means responsive to each of said sync patterns for controlling the positioN at which a line is initiated.
Claim 10
Dependent Claim
71 words
A circuit of the type described in claim 7 wherein a predetermined number of character positions are available for a predetermined group of display lines; and including means operative when lines of greater than a predetermined length are displayed within a line group for shortening at least one of the lines of the line group to assure that no more than said predetermined number of character positions exist within the group.
Claim 11
Dependent Claim
104 words
A circuit of the type described in claim 7 wherein said display device is a cathode ray tube having a display screen and a horizontal deflection coil; and wherein said position altering means includes means operative at the beginning of lines of the display which are to begin at a point near the left edge of said screen for applying sufficient current to said coil to move the raster to said point, and means operative at the beginning of each line which is to start at a selected point to the right of said predetermined point for reducing the current flow through said coil.
Claim 12
Dependent Claim
48 words
A circuit of the type described in claim 10 including means for applying a bias potential across said coil; and wherein said position altering means includes means operative for shunting current flowing through the deflection coil bias applying means, whereby the current flowing through said coil is reduced.
Claim 13
Dependent Claim
99 words
A circuit for controlling the movement of a multiline raster on a cyclically scanned display device comprising: first control means normally operative to cause each line of said raster to be initiated at a first predetermined position; second control means selectively operative to, in conjunction with said first control means, cause said line of the raster to be initiated at a second predetermined position; means for detecting selected raster position and other conditions; and means responsive to the detection of said conditions for a given line of the raster for rendering said second control means operative for said line.
Claim 14
Dependent Claim
99 words
A circuit for controlling the movement of a multiline raster on a cyclically scanned display device comprising: first control means normally operative to cause each line of said raster to be initiated at a first predetermined position; second control means selectively operative to, in conjunction with said first control means, cause said line of the raster to be initiated at a second predetermined position; means for detecting selected raster position and other conditions; and means responsive to the detection of said conditions for a given line of the raster for rendering said second control means operative for said line.
Claim 15
Dependent Claim
109 words
A circuit of the type described in claim 12 wherein said display device is a cathode ray tube having a display screen and a horizontal deflection coil; wherein said first control means includes means operative at the beginning of each line of the display to apply sufficient current to said coil to move the raster to a predetermined point near the left edge of said screen; and wherein said second control means includes means for reducing the current flow through said coil at the beginning of each of said given lines, causing said raster to be deflected only to a selected point to the right of said predetermined point.
Claim 16
Dependent Claim
48 words
A circuit of the type described in claim 13 including means for applying a bias potential across said coil; and wherein said second control means includes means operative for shunting current flowing through the deflection coil bias applying means whereby the current flowing through said coil is reduced.
Claim 17
Dependent Claim
71 words
A circuit of the type described in claim 11 wherein a predetermined number of character positions are available for a predetermined group of display lines; and including means operative when lines of greater than a predetermined length are displayed within a line group for shortening at least one of the lines of the line group to assure that no more than said predetermined number of character positions exist within the group.
Claim 18
Dependent Claim
198 words
A circuit for controlling a CRT raster, said raster consisting of a plurality of horizontal lines, each formed by a plurality of vertical strokes, characters being formed for display on said CRT be selectively intensifying index points on said strokes, comprising: means for advancing said raster from line to line; means for controlling the position along a line at which the raster for the line begins; means normally operative at the end of each line for generating a predetermined sync pulse pattern; means responsive to said predetermined sync pulse pattern for causinG said advancing means to advance said raster by a predetermined number of full or partial lines and for causing said position controlling means to begin said raster at a predetermined position on the line; means operative at the end of a selected line of the display for generating a different sync pulse pattern; means responsive to said different sync pulse pattern, said means including in part said predetermined sync pulse pattern responsive means, for causing at least one of said advancing means and position controlling means to function differently from the manner in which it functioned in response to said predetermined sync pulse pattern responsive means.
Claim 19
Dependent Claim
198 words
A circuit for controlling a CRT raster, said raster consisting of a plurality of horizontal lines, each formed by a plurality of vertical strokes, characters being formed for display on said CRT be selectively intensifying index points on said strokes, comprising: means for advancing said raster from line to line; means for controlling the position along a line at which the raster for the line begins; means normally operative at the end of each line for generating a predetermined sync pulse pattern; means responsive to said predetermined sync pulse pattern for causinG said advancing means to advance said raster by a predetermined number of full or partial lines and for causing said position controlling means to begin said raster at a predetermined position on the line; means operative at the end of a selected line of the display for generating a different sync pulse pattern; means responsive to said different sync pulse pattern, said means including in part said predetermined sync pulse pattern responsive means, for causing at least one of said advancing means and position controlling means to function differently from the manner in which it functioned in response to said predetermined sync pulse pattern responsive means.
Claim 20
Dependent Claim
73 words
A circuit of the type described in claim 16 wherein said predetermined sync pulse pattern generating means includes means for generating a predetermined number of sync pulses; wherein said different sync pulse pattern generating means includes means for generating a different number of sync pulses; and wherein said advancing means is operative to advance said raster by a predetermined number of full or partial lines in response to each of said sync pulses.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |