US4247869A
Expired / Lapsed
US
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Method and apparatus for improving resolution and linearity in a beam-index display system
Assignee: Tektronix Inc
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Filing: 1979-04-16
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Granted: 1981-01-27
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Expires: 1999-04-16
Abstract
Abstract A beam-index display system wherein a control signal representative of the position of an electron beam within a beam-index cathode-ray tube is employed to control concurrently both the generation and selection of video drive signals for transmission to the beam-producing apparatus of the tube.
Inventors
- 👤 Robert G. Culter
- 👤 Charles S. Osborne, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/22; H04N9/24; G; G09; G09G; G09G1/00; G09G1/28
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
A beam-index color display system comprising: (a) A beam-index cathode-ray tube including a display medium, means for producing an electron beam, and means for directing said beam toward said medium; (b) deflection means for causing said beam to sweep across said display medium; (c) means responsive to the presence of said electron beam for producing a beam-index signal representative of the position of said beam within said tube; (d) means responsive to said index signal for generating a digital bit stream defining an image to be displayed; and (e) means also responsive to said index signal for sequentially selecting successive bits of said bit stream in continuous timed synchrony with their generation and for transmitting said selected bits to said cathode-ray tube for conversion into a visual display representative of said image.
Claim 2
Dependent Claim
132 words
A beam-index color display system comprising: (a) A beam-index cathode-ray tube including a display medium, means for producing an electron beam, and means for directing said beam toward said medium; (b) deflection means for causing said beam to sweep across said display medium; (c) means responsive to the presence of said electron beam for producing a beam-index signal representative of the position of said beam within said tube; (d) means responsive to said index signal for generating a digital bit stream defining an image to be displayed; and (e) means also responsive to said index signal for sequentially selecting successive bits of said bit stream in continuous timed synchrony with their generation and for transmitting said selected bits to said cathode-ray tube for conversion into a visual display representative of said image.
Claim 3
Dependent Claim
81 words
The beam-index color display system of claim 1 wherein said means (d) includes means responsive to said beam-index signal for generating a plurality of digital bit streams, each of which defines a differentiable characteristic of said image, and wherein said means (e) includes means also responsive to said beam-index signal for sequentially selecting a successive bit from each of said bit streams and for transmitting said selected bits, in the order of their selection, to said cathode-ray tube for said conversion.
Claim 4
Dependent Claim
57 words
The beam-index color display system of claim 1 wherein said beam-index signal comprises a series of digital pulses and wherein said means (d) comprises a digital character generator having means for receiving said beam-index signal and means for producing a successive bit of said digital bit stream in response to the receipt of each said digital pulse.
Claim 5
Dependent Claim
75 words
In a color display system including a beam-index cathode-ray tube, means for producing a beam-index signal, means for generating a plurality of digital drive signals defining an image to be displayed, and means responsive to said beam-index signal for sequentially selecting said drive signals for transmission to said tube, the improvement comprising means also responsive to said beam-index signal for causing said drive signals to be generated in continuous timed synchrony with their sequential selection.
Claim 6
Dependent Claim
75 words
In a color display system including a beam-index cathode-ray tube, means for producing a beam-index signal, means for generating a plurality of digital drive signals defining an image to be displayed, and means responsive to said beam-index signal for sequentially selecting said drive signals for transmission to said tube, the improvement comprising means also responsive to said beam-index signal for causing said drive signals to be generated in continuous timed synchrony with their sequential selection.
Claim 7
Independent Claim
94 words
A method of improving resolution and linearity in a beam-index display system, said method comprising the steps of: (a) generating a beam-index signal representative of the position of an electron beam within a cathode-ray display tube; (b) responsive to said beam-index signal, generating a digital bit stream defining an image to be displayed; (c) also responsive to said beam-index signal, sequentially selecting successive bits of said bit stream in continuous timed synchrony with their generation; and (d) transmitting said selected bits to said display tube for conversion into a visual representation of said image.
Claim 8
Independent Claim
94 words
A method of improving resolution and linearity in a beam-index display system, said method comprising the steps of: (a) generating a beam-index signal representative of the position of an electron beam within a cathode-ray display tube; (b) responsive to said beam-index signal, generating a digital bit stream defining an image to be displayed; (c) also responsive to said beam-index signal, sequentially selecting successive bits of said bit stream in continuous timed synchrony with their generation; and (d) transmitting said selected bits to said display tube for conversion into a visual representation of said image.
Claim 9
Dependent Claim
80 words
The method of claim 5 wherein said step (b) includes, responsive to said beam-index signal, generating a plurality of digital bit streams, each of which defines a differentiable characteristic of said image to be displayed, wherein said step (c) includes, also responsive to said beam-index signal, sequentially selecting a successive bit from each of said bit streams, and wherein said step (d) includes transmitting said selected bits, in the order of their selection, to said display tube for said conversion.
References Cited (Backward Citations)
US2887528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |