Patent US3836902A successfully refreshed from Google Patents.
US3836902A
Expired / Lapsed
US
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Graphic display having recirculating video memory
Assignee: Toshiba Corp
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Filing: 1972-12-14
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Granted: 1974-09-17
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Expires: 1992-12-14
Abstract
Abstract Graphic information from an electronic computer or the like is written into a memory matrix in a dotted pattern corresponding to a figure to be displayed using a function generator which generates line segments, corresponding to the graphic information. The information in the memory matrix is then shifted into a recirculating memory for displaying the graphic information in the form of a figure on a CRT, such as the screen of a TV set. The recirculating memory is synchronized with the raster scan of the TV set, and thus there is no need for synchronizing the display system with the computer.
Inventors
- 👤 N Okuda
- 👤 T Kunikyo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:23
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/36; G09G5/39; G09G5/363
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A graphic display system comprising: a function generator means for generating coordinate components of line segments of a figure to be displayed in accordance with input information; memory matrix means for storing a dotted pattern of said figure to be displayed in accordance with output signals from said function generator; raster scanning means for scanning a cathode-ray tube; and a recirculating memory means for storing information shifted from said memory matrix means, said information shifted from said memory matrix means being circulated in synchronism with said raster scanning means; wherein said recirculating memory means is comprised of a number of closed loop shift registers, said number corresponding to the number of raster scans of said cathode-ray tube carried out by said raster scanning means in one cycle of its operation.
Claim 2
Dependent Claim
130 words
A graphic display system comprising: a function generator means for generating coordinate components of line segments of a figure to be displayed in accordance with input information; memory matrix means for storing a dotted pattern of said figure to be displayed in accordance with output signals from said function generator; raster scanning means for scanning a cathode-ray tube; and a recirculating memory means for storing information shifted from said memory matrix means, said information shifted from said memory matrix means being circulated in synchronism with said raster scanning means; wherein said recirculating memory means is comprised of a number of closed loop shift registers, said number corresponding to the number of raster scans of said cathode-ray tube carried out by said raster scanning means in one cycle of its operation.
Claim 3
Dependent Claim
66 words
A graphic display system, as in claim 1, further comprising: raster counter means for transferring said dotted pattern stored in said matrix memory means to said shift registers on a line by line basis in a predetermined sequence, pulse generator means for generating shift pulses; and, line counter means for feeding pulses to said raster counter by counting predetermined shift pulses from said pulse generator means.
Claim 4
Dependent Claim
43 words
A graphic display system as in claim 1 wherein said function generator means includes reversible counter means for addressing said memory matrix means and further includes gate means connected to said reversible counter means for counting the origin coordinates of a line segment.
Claim 5
Dependent Claim
20 words
A graphic display system as in claim 1 including means for a partial elimination of said figure to be displayed.
Claim 6
Dependent Claim
20 words
A graphic display system as in claim 1 including means for a partial addition of said figure to be displayed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |