US3717872A
Expired / Lapsed
US
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High fidelity symbol display through limited bandwidth system
Assignee: Raytheon Co
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Filing: 1970-06-01
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Granted: 1973-02-20
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Expires: 1990-06-01
Abstract
Abstract A symbol display system is disclosed which uses short strokes to form a symbol. The strokes proceed from point to point, each stroke being defined by cumulative changes in X and Y coordinates from a designated starting point. Each change from one point to another is sequentially read from a storage unit addressed by a symbol select matrix and a time counter. To maximize the speed of the strokes without distortion at corners of more than about 45*, a zero change is stored as the next change following a change leading to the corner point. More than one symbol may be programmed for display on a line. A program counter controls a sequencer to address the symbols to be displayed in sequence through the symbol display matrix, and to initiate displacement of the starting point for the next symbol a predetermined distance from the starting point of the last symbol.
Inventors
- 👤 W Yancey
- 👤 M Snook
- 👤 Roche P Joujon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:36
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/08; G09G1/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
143 words
In a display system employing a cathode ray tube having a beam deflection system for displacing an electron beaM from the center in response to X and Y signals which define points on the face of said tube according to their amplitude and polarity in a rectangular Cartesian coordinate system and having apparatus for displaying a symbol composed of short straight lines produced as strokes, each stroke requiring a period of predetermined duration that is the same for all strokes, the combination comprising; a source of system clock pulses, and means responsive to said clock pulses for generating waveform signals Xs and Ys to deflect said beam in said short straight line strokes with no change in amplitude or polarity of said waveforms for a predetermined period immediately preceding a stroke which changes direction of beam deflection by more than a predetermined amount.
Claim 2
Dependent Claim
143 words
In a display system employing a cathode ray tube having a beam deflection system for displacing an electron beaM from the center in response to X and Y signals which define points on the face of said tube according to their amplitude and polarity in a rectangular Cartesian coordinate system and having apparatus for displaying a symbol composed of short straight lines produced as strokes, each stroke requiring a period of predetermined duration that is the same for all strokes, the combination comprising; a source of system clock pulses, and means responsive to said clock pulses for generating waveform signals Xs and Ys to deflect said beam in said short straight line strokes with no change in amplitude or polarity of said waveforms for a predetermined period immediately preceding a stroke which changes direction of beam deflection by more than a predetermined amount.
Claim 3
Dependent Claim
143 words
In a display system employing a cathode ray tube having a beam deflection system for displacing an electron beaM from the center in response to X and Y signals which define points on the face of said tube according to their amplitude and polarity in a rectangular Cartesian coordinate system and having apparatus for displaying a symbol composed of short straight lines produced as strokes, each stroke requiring a period of predetermined duration that is the same for all strokes, the combination comprising; a source of system clock pulses, and means responsive to said clock pulses for generating waveform signals Xs and Ys to deflect said beam in said short straight line strokes with no change in amplitude or polarity of said waveforms for a predetermined period immediately preceding a stroke which changes direction of beam deflection by more than a predetermined amount.
Claim 4
Dependent Claim
143 words
In a display system employing a cathode ray tube having a beam deflection system for displacing an electron beaM from the center in response to X and Y signals which define points on the face of said tube according to their amplitude and polarity in a rectangular Cartesian coordinate system and having apparatus for displaying a symbol composed of short straight lines produced as strokes, each stroke requiring a period of predetermined duration that is the same for all strokes, the combination comprising; a source of system clock pulses, and means responsive to said clock pulses for generating waveform signals Xs and Ys to deflect said beam in said short straight line strokes with no change in amplitude or polarity of said waveforms for a predetermined period immediately preceding a stroke which changes direction of beam deflection by more than a predetermined amount.
Claim 5
Dependent Claim
15 words
The combination of claim 1 wherein said predetermined amount is about half a right angle.
Claim 6
Dependent Claim
19 words
The combination of claim 2 wherein said predetermined period and said stroke period is equal to a clock period.
Claim 7
Dependent Claim
38 words
The combination of claim 3 including means for generating static signals defining a point on the face of said tube where said symbol is to be displayed, and means for adding said waveforms signal to said static signals.
Claim 8
Independent Claim
176 words
A system for displaying on the face of a cathode ray tube a symbol formed with substantially straight line strokes of an electron beam controlled by an X-Y rectangular Cartesian coordinate beam deflection system, comprising; means for storing X and Y deflection values required for each of a sequence of strokes, each set of deflection values being specified relative to the end point of a preceding stroke, except values of the first set which are relative to a starting point, and for effectively storing zeros as no-deflection values between deflection values which will change direction of said beam by more than a predetermined amount; means for reading out of said storage means said X and Y deflection values in sequence, including said no-deflection values; means responsive to said reading means for generating signals corresponding in amplitude and polarity to the magnitude and sign of said X and Y deflection values; means for integrating said signals to provide waveforms comprising sequences of ramp voltages for deflection of said beam in said straight line strokes forming said symbol.
Claim 9
Independent Claim
176 words
A system for displaying on the face of a cathode ray tube a symbol formed with substantially straight line strokes of an electron beam controlled by an X-Y rectangular Cartesian coordinate beam deflection system, comprising; means for storing X and Y deflection values required for each of a sequence of strokes, each set of deflection values being specified relative to the end point of a preceding stroke, except values of the first set which are relative to a starting point, and for effectively storing zeros as no-deflection values between deflection values which will change direction of said beam by more than a predetermined amount; means for reading out of said storage means said X and Y deflection values in sequence, including said no-deflection values; means responsive to said reading means for generating signals corresponding in amplitude and polarity to the magnitude and sign of said X and Y deflection values; means for integrating said signals to provide waveforms comprising sequences of ramp voltages for deflection of said beam in said straight line strokes forming said symbol.
Claim 10
Dependent Claim
38 words
The combination of claim 5 including: means for generating static signals defining a point on the face of said tube at which said symbol is to be displayed; and means for adding said waveforms to said static signals.
Claim 11
Dependent Claim
104 words
The combination of claim 5 wherein said cathode ray tube has a beam unblanking means, said point defined by said static signals differs from said starting point, said storage means includes deflection values required to move said beam from said defined point to said starting point in at least one initial stroke, and said storage means further includes a beam unblanking code with the next non-zero deflection value to be read out for the next stroke from said starting point, said combination including means responsive to said unblanking code for producing an unblanking signal to cause said beam unblanking means to unblank said beams.
Claim 12
Dependent Claim
29 words
The combination of claim 7 including means for terminating said beam unblanking signal a predetermined period after the last non-zero deflection value has been read from said storage means.
Claim 13
Dependent Claim
34 words
The combination of claim 8 wherein said means for terminating said beam unblanking signal comprises an unblanking code read from said storage means as the second non-deflection value following said last non-zero deflection value.
Claim 14
Dependent Claim
170 words
A symbol display system employing short straight line strokes to form symbols on the face of a cathode ray tube having a beam deflection system, said strokes proceeding from point to point, the starting point of a stroke being the end point of the last stroke imMediately preceding it, and the initial starting point being defined by static deflection signals in a rectangular Cartesian coordinate system comprising; means for storing in digital form stroke values of symbols to be displayed with zeros as non-deflection strokes between successive strokes having directions of beam deflection that differ by more than about 45*; means for addressing a group of stored stroke values pertaining to a selected one of said symbols; means for reading said stored stroke values pertaining to any selected one of said symbols in sequence; means for converting successive stroke values read into analog step voltage signals; means for integrating successive step voltage signals to produce a symbol waveform; and means for adding said symbol waveform to said static deflection signals.
Claim 15
Dependent Claim
170 words
A symbol display system employing short straight line strokes to form symbols on the face of a cathode ray tube having a beam deflection system, said strokes proceeding from point to point, the starting point of a stroke being the end point of the last stroke imMediately preceding it, and the initial starting point being defined by static deflection signals in a rectangular Cartesian coordinate system comprising; means for storing in digital form stroke values of symbols to be displayed with zeros as non-deflection strokes between successive strokes having directions of beam deflection that differ by more than about 45*; means for addressing a group of stored stroke values pertaining to a selected one of said symbols; means for reading said stored stroke values pertaining to any selected one of said symbols in sequence; means for converting successive stroke values read into analog step voltage signals; means for integrating successive step voltage signals to produce a symbol waveform; and means for adding said symbol waveform to said static deflection signals.
Claim 16
Dependent Claim
75 words
A symbol display system as defined in claim 10 wherein said cathode ray tube has a beam unblanking means, and said stroke values stored in digital code include beam unblanking control signals for unblanking from a first stroke forming a given symbol to a second no-deflection stroke value following a first no-deflection stroke value after a final stroke forming said given symbol, and means responsive to said beam unblanking signal to said beam unblanking means.
Claim 17
Dependent Claim
148 words
A symbol display system as defined in claim 11 wherein said addressing means include means for addressing more than one group of stroke values pertaining to more than one of said symbols for display in sequence, each displaced from the other a predetermined amount, and said second no-deflection stroke value following a first no-deflection stroke value includes a stop code digit, said display system including; means for programming the addressing of more than one group of stroke values; means for advancing said programming means from the address of one programmed group of stroke value to another in response to said stop code digit; means responsive to said stop code digit for changing said static deflection signals to move the initial starting point for each symbol displayed a predetermined distance in a predetermined direction; and means responsive to said stop code digit for resetting said integrating means to zero.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |