Patent US4663618A successfully refreshed from Google Patents.
US4663618A
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US
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Arbitrary raster blanking circuit
Assignee: Boeing North American Inc
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Filing: 1983-12-22
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Granted: 1987-05-05
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Expires: 2003-12-22
Abstract
Abstract An apparatus is disclosed for displaying arbitrary forms on a raster-scanned cathode ray tube converting the analog X and Y deflection voltages of the raster signal directly into a digital TTL level blanking signal. The circuit designer, utilizing cartesian or polar coordinates, specifies a desired shape and its location utilizing the appropriate formulas. In this manner, a number of raster cut-out circuits are readily coupled to define a desired number of arbitrary shapes on a raster scanned cathode ray tube.
Inventors
- 👤 Donald G. Hayles
- 👤 Mark N. Hepworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:35
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
A circuit for displaying arbitrary forms on a raster scanned cathode ray tube display as a corrdinate function relative to a specified reference point on said display comprising: a. means, 106, 128 for designating a specified rference point on said display, said reference point having predetermined X and Y deflection voltage constants, respectively; b. means 102, 122, coupled to said means for designating, for defining an X and Y coordinate system for said cathode ray tube display, wherein each possible location of said specified reference point on said display is represented in the form (positive X, positive Y); c. means 100, 120 in cooperation with said means for designating and coupled thereto, for sensing operational analog X and Y deflection voltages relative to said reference point voltage constants; and d. means 160, coupled to said means for defining, through comparator means 149, for relating a specified coordinate function, relative to said operational analog X and Y deflection voltages, respectively, and in terms defined by said means for defining, to said specified reference point voltage constants, thereby defining a predetermined form and location on said display.
Claim 2
Dependent Claim
185 words
A circuit for displaying arbitrary forms on a raster scanned cathode ray tube display as a corrdinate function relative to a specified reference point on said display comprising: a. means, 106, 128 for designating a specified rference point on said display, said reference point having predetermined X and Y deflection voltage constants, respectively; b. means 102, 122, coupled to said means for designating, for defining an X and Y coordinate system for said cathode ray tube display, wherein each possible location of said specified reference point on said display is represented in the form (positive X, positive Y); c. means 100, 120 in cooperation with said means for designating and coupled thereto, for sensing operational analog X and Y deflection voltages relative to said reference point voltage constants; and d. means 160, coupled to said means for defining, through comparator means 149, for relating a specified coordinate function, relative to said operational analog X and Y deflection voltages, respectively, and in terms defined by said means for defining, to said specified reference point voltage constants, thereby defining a predetermined form and location on said display.
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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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |