US4190834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit and method for producing a full-screen cross-hair cursor on a raster-scan type display
Assignee: Tektronix Inc
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Filing: 1978-10-16
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Granted: 1980-02-26
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Expires: 1998-10-16
Abstract
Abstract A circuit and method for receiving and sequentially decrementing the x and y coordinates of a desired cursor location so as to produce in a raster-scan display system a cross-hair cursor the component parts of which extend the full height and width of the display area.
Inventors
- 👤 Douglas J. Doornink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:53
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
147 words
A circuit for producing a full-screen cross-hair cursor in a display system including a display screen and means for producing a raster-scan image thereon, said circuit comprising: (a) positional means for producing first and second digital signals representative respectively of first and second coordinate values of a desired location on said screen of a cursor to be produced; (b) first counter means for receiving and selectively decrementing said first digital signal and for producing a first indication when said signal has been decremented to zero; (c) second counter means for receiving and selectively decrementing said second signal and for producing a second indication when said signal has been decremented to zero; and (d) means responsive to said first and second indications for producing an illuminated spot on the screen of said display system whenever either, but not both, of said digital signals have been decremented to zero.
Claim 2
Dependent Claim
147 words
A circuit for producing a full-screen cross-hair cursor in a display system including a display screen and means for producing a raster-scan image thereon, said circuit comprising: (a) positional means for producing first and second digital signals representative respectively of first and second coordinate values of a desired location on said screen of a cursor to be produced; (b) first counter means for receiving and selectively decrementing said first digital signal and for producing a first indication when said signal has been decremented to zero; (c) second counter means for receiving and selectively decrementing said second signal and for producing a second indication when said signal has been decremented to zero; and (d) means responsive to said first and second indications for producing an illuminated spot on the screen of said display system whenever either, but not both, of said digital signals have been decremented to zero.
Claim 3
Dependent Claim
75 words
The cursor producing circuit of claim 1 wherein said image produced by said display system is composed of a plurality of sequentially generated frames each of which is composed of a plurality of sequentially generated, mutually parallel raster-line segments divided into a plurality of equally spaced, sequentially occuring time divisions, and wherein said first counter means includes means for decrementing said first digital signal at a rate of one digital unit per said time division.
Claim 4
Dependent Claim
31 words
The cursor producing circuit of claim 2 wherein said second counter means includes means for decrementing said second digital signal at a rate of one digital unit per said line segment.
Claim 5
Dependent Claim
32 words
The cursor producing circuit of claim 2 wherein said first counter means includes means for receiving said first digital signal prior to the beginning of the production of each said line segment.
Claim 6
Dependent Claim
31 words
The cursor producing circuit of claim 3 wherein said second counter means includes means for receiving said second digital signal prior to the beginning of the production of each said frame.
Claim 7
Dependent Claim
52 words
The cursor producing circuit of claim 2 wherein the raster-line segments of every other said frame are interlaced with the raster-line segments of the immediately preceding said frame, and wherein said circuit further comprises means for disabling the operation of said second counter means during the production of every other said frame.
Claim 8
Independent Claim
128 words
A method for producing a full-screen cross-hair cursor in a display system including a display screen and means for producing a raster-scan image thereon, said method comprising the steps of: (a) producing first and second digital signals representative respectfully of first and second coordinate of a desired location on said screen of a cursor to be produced; (b) receiving and selectively decrementing said first digital signal and producing a first indication when said signal has been decremented to zero; (c) receiving and selectively decrementing said second digital signal and producing a second indication when said signal has been decremented to zero; and (d) producing an illuminated spot on the screen of said display system whenever either, but not both, of said digital signals have been decremented to zero.
Claim 9
Independent Claim
128 words
A method for producing a full-screen cross-hair cursor in a display system including a display screen and means for producing a raster-scan image thereon, said method comprising the steps of: (a) producing first and second digital signals representative respectfully of first and second coordinate of a desired location on said screen of a cursor to be produced; (b) receiving and selectively decrementing said first digital signal and producing a first indication when said signal has been decremented to zero; (c) receiving and selectively decrementing said second digital signal and producing a second indication when said signal has been decremented to zero; and (d) producing an illuminated spot on the screen of said display system whenever either, but not both, of said digital signals have been decremented to zero.
Claim 10
Dependent Claim
75 words
The cursor producing method of claim 7 wherein said image produced by said display system is composed of a plurality of sequentially generated frames each of which is composed of a plurality of sequentially generated, mutually parallel raster-line segments divided into a plurality of equally spaced sequentially occuring time divisions, and wherein said step (b) includes the step of decrementing said first digital signal at a rate of one digital unit per said time division.
Claim 11
Dependent Claim
30 words
The cursor producing method of claim 8 wherein said step (c) includes the step of decrementing said second digital signal at a rate of one digital unit per line segment.
Claim 12
Dependent Claim
29 words
The cursor producing method of claim 8 wherein said step (b) includes the step of receiving said first digital signal prior to the beginning of each said line segment.
Claim 13
Dependent Claim
30 words
The cursor producing method of claim 9 wherein said step (c) includes the step of receiving said second digital signal prior to the beginning of the production of each frame.
Claim 14
Dependent Claim
48 words
The cursor producing method of claim 8 wherein the raster-line segments of every other said frame are interlaced with the raster-line segments of the immediately preceding said frame, and wherein said step (c) includes decrementing said second digital signal only during the production of every other said frame.
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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) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |