US3768092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphic display apparatus
Assignee: Unisys Corp
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Filing: 1971-10-21
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Granted: 1973-10-23
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Expires: 1991-10-21
Abstract
Abstract A cathode ray tube display apparatus which uses a set of character codes sequentially addressed in a storage device in the process of generating a line-type display such as, for example, a graph. The direction of the line segments forming the display is encoded in the character set, and the direction encoded in each character code together with the character code determine the display position for the line segment represented by the next character code in the sequence. Input to the storage device is through a keyboard, but may be from an external source such as, for example, a data processor. The number of input keys is less than the number of character codes in the set, so that the display apparatus determines the nature of the character code to be loaded into the storage device by each keyboard input. A background line-type scale for the graph, in the form of coordinate axes, is also generated and displayed.
Inventors
- 👤 T Dodds
- 👤 H Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:15
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/02; G06F3/0202; G06F3/0219; G06F3/048; G06F3/0487; G06F3/0489; G09; G09G; G09G1/00; G09G1/06; G09G1/08; G09G1/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
174 words
An apparatus for generating and displaying line segments as characters wherein the display generated depends upon the sequence in which the segments are displayed, having a cathode ray tube display, a memory for holding line segment instructions, a keyboard input device, and a computer storage input device, the improvement comprising: a graphic decoder tied to said memory; a count vertical-up register tied to said graphic decoder; a count vertical-down register tied to said graphic decoder; a vertical position counter coupled to said count vertical-up and count vertical-down registers, said vertical position counter driving said CRT vertical deflection; a horizontal position counter coupled to said CRT horizontal deflection; symbol generating means responsive to each line segment instruction in said memory for driving said vertical position counter and said horizontal position counter for generating each individual line segment; and detector means responsive to each of certain line segment codes in said memory for affecting said horizontal position means in accordance with the particular instruction for establishing the position of the next line segment in the sequence.
Claim 2
Independent Claim
174 words
An apparatus for generating and displaying line segments as characters wherein the display generated depends upon the sequence in which the segments are displayed, having a cathode ray tube display, a memory for holding line segment instructions, a keyboard input device, and a computer storage input device, the improvement comprising: a graphic decoder tied to said memory; a count vertical-up register tied to said graphic decoder; a count vertical-down register tied to said graphic decoder; a vertical position counter coupled to said count vertical-up and count vertical-down registers, said vertical position counter driving said CRT vertical deflection; a horizontal position counter coupled to said CRT horizontal deflection; symbol generating means responsive to each line segment instruction in said memory for driving said vertical position counter and said horizontal position counter for generating each individual line segment; and detector means responsive to each of certain line segment codes in said memory for affecting said horizontal position means in accordance with the particular instruction for establishing the position of the next line segment in the sequence.
Claim 3
Dependent Claim
67 words
The apparatus of claim 1 wherein said symbol generating means includes: a line type storage register connected to said graphic decoder; a modulator connected to said line storage register; a symbol generator fed by said modulator and said memory; and memory control and timing means fed by said symbol generator for controlling said vertical position counter and said horizontal position counter for generating each individual line segment.
Claim 4
Dependent Claim
59 words
The apparatus of claim 2 wherein said detector means includes: a display direction register loaded from said memory and said graphic deCoder; a change of direction detector connected to said display direction register and said graphic decoder; and horizontal count inhibiting means associated with said graphic decoder and said change of direction detector for affecting said horizontal position counter.
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |