US3611348A
Expired / Lapsed
US
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Character display system
Assignee: Ultronic Systems Corp
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Filing: 1969-08-05
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Granted: 1971-10-05
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Expires: 1989-08-05
Abstract
Abstract A system responsive to incoming electrical digital signals representing alpha-numeric characters and supplied in series character format at a varying rate. The system is adapted to display these characters in the form of dot matrices and to move such displayed characters in a video line across the face of a cathode-ray tube. The rate of character movement is varied in accordance with changes in the rate at which the signals are supplied to the system to eliminate visually apparent changes in the speed of movement of the displayed characters.
Inventors
- 👤 William Paul Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:25
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/34; G09G5/343
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
351 words
A system responsive to incoming digital signals representing alpha-numeric characters and supplied in series character format at a varying rate, said system being adapted to display said characters serially and move same in a video line across the face of a cathode-ray tube, the visual speed of character movement varying in accordance with changes in the incoming signal rate to eliminate visually apparent rapid changes in said speed, said system comprising: a register having a predetermined number of storage stages and adapted to receive and store said signals prior to display in series character format, the stored characters being automatically shifted from stage to stage between an input and an output; first means coupled to the output of said register and responsive to each stored character appearing successively thereat to process same and thereafter to deliver same to said tube for display; second means coupled to said register and rendered responsive during each period between the end of the display of a video line and the beginning of the display of the next video line to provide a count signal in the form of a pulse train containing a variable number of pulses, the number of pulses varying in a predetermined manner with the number of full undisplayed stages in said register during said period; third means responsive to each pulse in each train to produce an output signal upon receipt of each Nthe pulse, N is a selected integer; and fourth means coupled to said register and responsive to said output signals, said fourth means, during each said period when the output signals are absent, repositioning the stored characters in the register in a manner at which each character to be displayed in the next video line is maintained in the same relative position as in the immediately preceding video line, said fourth means, during each said period when the output signals are present, repositioning the stored characters in the register in a manner at which each character to be displayed in the next video line is advanced one character position relative to its position in the preceding video line.
Claim 2
Independent Claim
351 words
A system responsive to incoming digital signals representing alpha-numeric characters and supplied in series character format at a varying rate, said system being adapted to display said characters serially and move same in a video line across the face of a cathode-ray tube, the visual speed of character movement varying in accordance with changes in the incoming signal rate to eliminate visually apparent rapid changes in said speed, said system comprising: a register having a predetermined number of storage stages and adapted to receive and store said signals prior to display in series character format, the stored characters being automatically shifted from stage to stage between an input and an output; first means coupled to the output of said register and responsive to each stored character appearing successively thereat to process same and thereafter to deliver same to said tube for display; second means coupled to said register and rendered responsive during each period between the end of the display of a video line and the beginning of the display of the next video line to provide a count signal in the form of a pulse train containing a variable number of pulses, the number of pulses varying in a predetermined manner with the number of full undisplayed stages in said register during said period; third means responsive to each pulse in each train to produce an output signal upon receipt of each Nthe pulse, N is a selected integer; and fourth means coupled to said register and responsive to said output signals, said fourth means, during each said period when the output signals are absent, repositioning the stored characters in the register in a manner at which each character to be displayed in the next video line is maintained in the same relative position as in the immediately preceding video line, said fourth means, during each said period when the output signals are present, repositioning the stored characters in the register in a manner at which each character to be displayed in the next video line is advanced one character position relative to its position in the preceding video line.
Claim 3
Dependent Claim
81 words
A system as set forth in claim 1 wherein the characters are displayed in the form of dot matrices, each shift of one character position representing a shift of K integral dot positions where K is a selected integer, said first means including first additional means responsive to said pulse train to advance the characters in the next video line by an integral number of dot positions ranging from zero to K, depending upon the number of pulses in the train.
Claim 4
Dependent Claim
54 words
A system as set forth in claim 2 wherein said first means includes second additional means responsive to said pulse train to advance the characters in the next video line by a fraction of an integral dot position, said fraction ranging from zero to one, depending upon thE number of pulses in the train.
Claim 5
Dependent Claim
48 words
A system as set forth in claim 3 wherein said first means includes a dot encoder coupled to the output of said register and an additional register having an output at which each encoded character appears in series dot format and coupled at its input to said encoder.
Claim 6
Dependent Claim
30 words
A system as set forth in claim 4 wherein said first additional means includes a first variable delay device coupled at its input to the output of the additional register.
Claim 7
Dependent Claim
30 words
A system as set forth in claim 5 wherein said second additional means includes a second variable delay device coupled at its input to the output of the first device.
Claim 8
Dependent Claim
15 words
A system as set forth in claim 6 wherein N is equal to K+ 1.
Claim 9
Dependent Claim
23 words
A system as set forth in claim 7 wherein the fraction of a dot position can attain any one of M different values.
Claim 10
Dependent Claim
28 words
A system as set forth in claim 8 wherein said third means includes a variable counter operative to decrease to zero in increments from any number inserted therein.
Claim 11
Dependent Claim
48 words
A system as set forth in claim 9 wherein said fourth means includes a first counter coupled at its input to the variable counter output and at its output to said second device and being operative to divide output signals from said variable counter by a factor M.
Claim 12
Dependent Claim
50 words
A system as set forth in claim 10 wherein said fourth means includes a second counter coupled at its input to said first counter output and its output to said first means and said first device and being operative to divide a signal at its input by a factor K.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |