US3594756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crt curved character generator
Assignee: Unisys Corp
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Filing: 1967-12-26
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Granted: 1971-07-20
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Expires: 1987-12-26
Abstract
Abstract A character generator for a cathode-ray tube display system including the capability of digitally generating curved characters. Each diode matrix used for generating a character produces output signals in digital form representing the Xcoordinate, the Y-coordinate, the intensity of the particular stroke of the character being drawn, the degree of departure of the stroke from a straight line if it is to be curved and the direction in which it is to be curved.
Inventors
- 👤 Mauritz L Granberg
- 👤 Howard N Hanson
- 👤 Charles A Kiesling
- 👤 Jerome J Stoffel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:30
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/08; G09G1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
351 words
In a CRT display system having driving circuits coupled to deflection coils for generating alphanumeric characters composed of individual line segments, a circuit for curving selected ones of said line segments comprising: a. a character generator for generating n sequential groups of digital signals necessary to produce an alphanumeric character formed of n variable length line segments, each of said n groups of digital signals including first signals representing one of said line segments and second signals representing the degree of displacement from a straight line path for each line segment, b. a curve generator coupled to said character generator for receiving said second signals and generating j sequential groups of digital signals during the time each of said n groups of digital signals is being generated, each of said j groups of digital signals representing the extent of orthogonal displacement from a straight line path of one of said n line segments at a corresponding one of j locations along said segment, c. a first and second plurality of D/A converters having their outputs connected to said driving circuits, said first plurality of converters having their inputs coupled to said character generator for receiving said first signals in each of said n sequential groups of signals and producing analog signals for sequentially generating the n segments of said alphanumeric character, d. gate means coupling said j sequential groups of signals to said second group of D/A converters for producing a current through said deflection coils, and e. a translator coupled to said character generator for receiving said second signals and producing outputs which are coupled to said gate means, said translator generating any one of r signals each of which represents a different extent of displacement said r signals enabling selected ones of said gate means whenever any one of said n line segments is to be curved such that the j sequential groups of signals are coupled to selected ones of the D/A converters in said second group whereby said selected one of said n line segments is orthogonally displaced the desired degree at j points along said segment.
Claim 2
Dependent Claim
351 words
In a CRT display system having driving circuits coupled to deflection coils for generating alphanumeric characters composed of individual line segments, a circuit for curving selected ones of said line segments comprising: a. a character generator for generating n sequential groups of digital signals necessary to produce an alphanumeric character formed of n variable length line segments, each of said n groups of digital signals including first signals representing one of said line segments and second signals representing the degree of displacement from a straight line path for each line segment, b. a curve generator coupled to said character generator for receiving said second signals and generating j sequential groups of digital signals during the time each of said n groups of digital signals is being generated, each of said j groups of digital signals representing the extent of orthogonal displacement from a straight line path of one of said n line segments at a corresponding one of j locations along said segment, c. a first and second plurality of D/A converters having their outputs connected to said driving circuits, said first plurality of converters having their inputs coupled to said character generator for receiving said first signals in each of said n sequential groups of signals and producing analog signals for sequentially generating the n segments of said alphanumeric character, d. gate means coupling said j sequential groups of signals to said second group of D/A converters for producing a current through said deflection coils, and e. a translator coupled to said character generator for receiving said second signals and producing outputs which are coupled to said gate means, said translator generating any one of r signals each of which represents a different extent of displacement said r signals enabling selected ones of said gate means whenever any one of said n line segments is to be curved such that the j sequential groups of signals are coupled to selected ones of the D/A converters in said second group whereby said selected one of said n line segments is orthogonally displaced the desired degree at j points along said segment.
References Cited (Backward Citations)
US3335416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |