US3872446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual display system
Assignee: Raytheon Co
•
Filing: 1973-05-07
•
Granted: 1975-03-18
•
Expires: 1993-05-07
Abstract
Abstract An enhanced alphanumeric character display system in which a raster scan dot matrix is generated at a plurality of display locations with local computer control over local groups of displays is disclosed. Data from the generation of an individual dot matrix characters is locally stored in a recirculating register independently from a random access refresh memory thereby removing the recirculation function from the refresh memory. A technique for shifting selected dots in the character matrix to obtain improved characters is also disclosed.
Inventors
- 👤 Derek Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:16
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/22; G09G5/222; G06; G06F; G06F3/00; G06F3/14; G06F3/153; G09G5/24; G09G5/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
Apparatus for generating a visual display of characters on a cathode ray tube in a raster; said generated characters being formed from a dot matrix comprising means for generating a plurality of rows of characters each of which generated characters comprises a plurality of horizontal slices each of which slices comprises a plurality of dots such that each of said generated characters is comprised of a plurality of dots; means for sweeping the electron beam of said cathode ray tube across the screen in a raster pattern such that said electron beam is normally blanked; means for unblanking said electron beam in accordance with a predetermined instruction sequence such that a display of said characters is generated; and means for displacing certain of said generated dots from their normal character positions such that an enhanced character display is produced, said displacing means operating independently of said electron beam sweeping means.
Claim 2
Dependent Claim
150 words
Apparatus for generating a visual display of characters on a cathode ray tube in a raster; said generated characters being formed from a dot matrix comprising means for generating a plurality of rows of characters each of which generated characters comprises a plurality of horizontal slices each of which slices comprises a plurality of dots such that each of said generated characters is comprised of a plurality of dots; means for sweeping the electron beam of said cathode ray tube across the screen in a raster pattern such that said electron beam is normally blanked; means for unblanking said electron beam in accordance with a predetermined instruction sequence such that a display of said characters is generated; and means for displacing certain of said generated dots from their normal character positions such that an enhanced character display is produced, said displacing means operating independently of said electron beam sweeping means.
Claim 3
Dependent Claim
19 words
A visual display system in accordance with claim 1 wherein said character generating means comprises a read only memory.
Claim 4
Dependent Claim
20 words
A visual display system in accordance with claim 2 further comprising a recirculating memory for addressing said read only memory.
Claim 5
Dependent Claim
46 words
A visual display system in accordance with claim 3 wherein said read only memory has a plurality of output lines and further comprising means coupled to said output lines for sequentially coupling each of said output lines one at a time to said signal displacing means.
Claim 6
Dependent Claim
17 words
A visual display system in accordance with claim 4 wherein said coupling means comprises a shift register.
Claim 7
Dependent Claim
17 words
A visual display system in accordance with claim 1 wherein said signal displacing means comprises delay means.
Claim 8
Dependent Claim
16 words
A visual display system in accordance with claim 6 wherein said delay means comprises a flip-flop.
Claim 9
Dependent Claim
17 words
A visual display system in accordance with claim 6 wherein said delay means comprises a delay line.
Claim 10
Dependent Claim
42 words
A visual display system in accordance with claim 6 further comprising video amplifier means, the input of said video amplifier means being coupled to said delay means and the output of said video amplifier means being coupled to said cathode ray tube.
Claim 11
Dependent Claim
34 words
A visual display system in accordance with claim 1 wherein said signal displacing means comprises means for causing selected ones of said dots to be displayed shifted by substantially one-half the normal inter-dot spacing.
References Cited (Backward Citations)
US3388391A
Cited
US3422420A
Cited
US3418518A
Cited
US3701988A
Cited
US3597757A
Cited
US3685039A
Cited
US3581290A
Cited
US3611348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |