US5672939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moire control of a color display device
Assignee: BenQ Corp
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Filing: 1995-11-02
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Granted: 1997-09-30
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Expires: 2015-11-02
Abstract
Abstract The present invention provides a horizontal (H) position modulator circuit for adjusting the horizontal impingement location of the electronic beam of a predetermined scan line and a vertical (V) position modulator circuit for adjusting the vertical impingement location of the electronic beam of a predetermined scan field. The H-position modulator, which is coupled to the H-position control circuit existing in the conventional color display device, responsive to the H-MOIRE control signal, changes the relative timing relation of horizontal synchronization signal to the video signals via the horizontal deflection circuit. The H-positions of electronic beam impingement of the predetermined scan lines are therefore adjusted. The V-position modulator, which is coupled to the V-position control circuit existing in the conventional color display device, responsive to the V-MOIRE control signal, changes the current flowing through the vertical deflection coil. The V-positions of electronic beam impingement of the predetermined scan field are therefore adjusted.
Inventors
- 👤 Chang Fa Hsiesh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:55
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
262 words
A video circuit for a color cathode ray tube which has an inner surface and a plurality of phosphors dots thereon and on which an electric beam is selectively impinged for generating image, responsive to a video signal, against a raster, the video circuit being coupled to a horizontal deflection circuit, comprising: a divide-by-2N circuit for generating an activation signal, responsive to a horizontal synchronization signal, N being an integer; a horizontal position control circuit having an input terminal adapted to receive a horizontal position control signal for controlling horizontal position of said image relative to the raster, said horizontal position control circuit having a terminal coupled to the horizontal deflection circuit for sinking current therefrom and for changing timing of the horizontal synchronization signal relative to the video signal; a horizontal position modulation circuit coupled to said horizontal position control circuit at said current-sinking terminal for micro-adjusting horizontal impingement position of electric beam of a predetermined horizontal scan lines relative to the phosphors dots, responsive to am H-MOIRE control signal and the activation signal, wherein the horizontal position modulation circuit comprises a transistor having an emitter connected in a DC path to ground via a resistor, a base of said transistor is adapted to receive the H-MOIRE control signal, a collector of said transistor is connected to said current-sinking terminal, the horizontal position modulation circuit further includes a switch transistor having a collector connected to the base of said transistor, an emitter connected to ground, and a base, the base of the switch transistor is adapted to receive the activation signal.
Claim 2
Dependent Claim
262 words
A video circuit for a color cathode ray tube which has an inner surface and a plurality of phosphors dots thereon and on which an electric beam is selectively impinged for generating image, responsive to a video signal, against a raster, the video circuit being coupled to a horizontal deflection circuit, comprising: a divide-by-2N circuit for generating an activation signal, responsive to a horizontal synchronization signal, N being an integer; a horizontal position control circuit having an input terminal adapted to receive a horizontal position control signal for controlling horizontal position of said image relative to the raster, said horizontal position control circuit having a terminal coupled to the horizontal deflection circuit for sinking current therefrom and for changing timing of the horizontal synchronization signal relative to the video signal; a horizontal position modulation circuit coupled to said horizontal position control circuit at said current-sinking terminal for micro-adjusting horizontal impingement position of electric beam of a predetermined horizontal scan lines relative to the phosphors dots, responsive to am H-MOIRE control signal and the activation signal, wherein the horizontal position modulation circuit comprises a transistor having an emitter connected in a DC path to ground via a resistor, a base of said transistor is adapted to receive the H-MOIRE control signal, a collector of said transistor is connected to said current-sinking terminal, the horizontal position modulation circuit further includes a switch transistor having a collector connected to the base of said transistor, an emitter connected to ground, and a base, the base of the switch transistor is adapted to receive the activation signal.
Claim 3
Dependent Claim
29 words
The video circuit of claim 1 wherein the collector of said transistor of said horizontal position modulation circuit is connected in a DC path to said current sinking terminal.
Claim 4
Dependent Claim
180 words
A video circuit for a color cathode ray tube which has an inner surface and a plurality of phosphors dots thereon and on which an electric beam is selectively impinged for generating image, in response to a video signal, against a raster, the video circuit being coupled to a horizontal deflection circuit, comprising: a divide-by-2N circuit for generating an activation signal, responsive to a horizontal synchronization signal, N being an integer; a horizontal position control circuit having an input terminal adapted to receive a horizontal position control signal for controlling horizontal position of said image relative to the raster, said horizontal position control circuit having a terminal coupled to the horizontal deflection circuit for sinking current therefrom and for changing timing of the horizontal synchronization signal relative to the video signal; a horizontal position modulation circuit coupled to said horizontal position control circuit at said current-sinking terminal, the horizontal position modulation circuit, responsive to an H-MOIRE control signal and the activation signal, micro-adjusting horizontal impingement position of electric beam of a predetermined horizontal scan line relative to the phosphorus dots.
Claim 5
Dependent Claim
180 words
A video circuit for a color cathode ray tube which has an inner surface and a plurality of phosphors dots thereon and on which an electric beam is selectively impinged for generating image, in response to a video signal, against a raster, the video circuit being coupled to a horizontal deflection circuit, comprising: a divide-by-2N circuit for generating an activation signal, responsive to a horizontal synchronization signal, N being an integer; a horizontal position control circuit having an input terminal adapted to receive a horizontal position control signal for controlling horizontal position of said image relative to the raster, said horizontal position control circuit having a terminal coupled to the horizontal deflection circuit for sinking current therefrom and for changing timing of the horizontal synchronization signal relative to the video signal; a horizontal position modulation circuit coupled to said horizontal position control circuit at said current-sinking terminal, the horizontal position modulation circuit, responsive to an H-MOIRE control signal and the activation signal, micro-adjusting horizontal impingement position of electric beam of a predetermined horizontal scan line relative to the phosphorus dots.
References Cited (Backward Citations)
US5430502A
Cited
US5440353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-29 | 2001-03-31 | 2001-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-29 | 2005-03-31 | 2005-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-29 | 2009-03-31 | 2009-09-30 | $7700.00 | Window Closed / Lapsed |