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US5523657A
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Convergence correction apparatus for picture image display device
Assignee: Toshiba Corp
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Filing: 1994-05-10
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Granted: 1996-06-04
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Expires: 2014-05-10
Abstract
Abstract A convergence correction apparatus for a picture image display device including a picture tube provided with an anode and a convergence coil, for displaying a picture image, a receiver for receiving a composite video signal, a separator for separating a horizontal periodic pulse and a vertical periodic pulse from the composite video signal, a convergence unit responsive to the horizontal periodic pulse for generating a high voltage convergence signal to be applied to the anode of the picture tube, a detector for detecting a fluctuation of the high voltage convergence signal, a ripple signal generator for generating a high voltage ripple signal corresponding to the fluctuation, a correction signal generator for generating a convergence correction signal including at least one of a horizontal periodic sawtooth wave signal, a vertical periodic sawtooth wave signal and a parabolic wave signal based on the horizontal periodic pulse and a vertical periodic pulse, an adjuster for adjusting the convergence correction signal by arithmetically processing the convergence correction signal with the high voltage ripple signal, and a supply unit for supplying the convergence coil of the picture tube with the adjusted convergence correction signal to cancel distortions of a picture image displayed in associated with the picture tube.
Inventors
- 👤 Kenji Kamei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:52
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
190 words
A convergence correction apparatus for a picture image display device, comprising: a picture tube provided with an anode and a convergence coil, for displaying a picture image; means for receiving a composite video signal: means for separating a horizontal periodic pulse and a vertical periodic pulse from the composite video signal; convergence means responsive to the horizontal periodic pulse for generating a high voltage convergence signal to be applied to the anode of the picture tube; means for detecting a fluctuation of the high voltage convergence signal; means for generating a high voltage ripple signal corresponding to the fluctuation; means for generating a convergence correction signal including at least one of a horizontal periodic sawtooth wave signal, a vertical periodic sawtooth wave signal and a parabolic wave signal based on the horizontal periodic pulse and a vertical periodic pulse; means for adjusting the convergence correction signal by arithmetically processing the convergence correction signal with the high voltage ripple signal; and means for supplying the convergence coil of the picture tube with the adjusted convergence correction signal to cancel distortions of a picture image displayed in associated with the picture tube.
Claim 2
Dependent Claim
190 words
A convergence correction apparatus for a picture image display device, comprising: a picture tube provided with an anode and a convergence coil, for displaying a picture image; means for receiving a composite video signal: means for separating a horizontal periodic pulse and a vertical periodic pulse from the composite video signal; convergence means responsive to the horizontal periodic pulse for generating a high voltage convergence signal to be applied to the anode of the picture tube; means for detecting a fluctuation of the high voltage convergence signal; means for generating a high voltage ripple signal corresponding to the fluctuation; means for generating a convergence correction signal including at least one of a horizontal periodic sawtooth wave signal, a vertical periodic sawtooth wave signal and a parabolic wave signal based on the horizontal periodic pulse and a vertical periodic pulse; means for adjusting the convergence correction signal by arithmetically processing the convergence correction signal with the high voltage ripple signal; and means for supplying the convergence coil of the picture tube with the adjusted convergence correction signal to cancel distortions of a picture image displayed in associated with the picture tube.
Claim 3
Dependent Claim
32 words
A convergence correction apparatus as claimed in claim 1, wherein the high voltage ripple signal generating means includes a filter for removing a vertical periodic component from the high voltage ripple signal.
Claim 4
Dependent Claim
270 words
A convergence correction apparatus for a picture image display device, comprising: picture image projection means including red (R), green (G) and blue (B) monochrome projection picture tubes, for displaying a color picture image, each of which is provided with an anode and a convergence coil; means for receiving a composite video signal; means for separating a horizontal periodic pulse and a vertical periodic pulse from the composite video signal; convergence means responsive to the horizontal periodic pulse for generating R, G and B high voltage convergence signals to be applied to the another of the R, G and B projection picture tubes; means for detecting fluctuations of the R, G and B high voltage convergence signals; means for generating R, G and B high voltage ripple signals corresponding to the fluctuations associated with the R, G and B high voltage convergence signals; means for generating R, G and B convergence correction signals each including at least one of a horizontal periodic sawtooth wave signal, a vertical periodic sawtooth wave signal and a parabolic wave signal based on the horizontal periodic pulse and a vertical periodic pulse; means for adjusting the R, G and B convergence correction signals by arithmetically processing the R, G and B convergence correction signals with the R, G and B high voltage ripple signals; and means for supplying the R, G and B convergence coils of the R, G and B projection picture tubes with the adjusted R, G and B convergence correction signals to cancel distortions of R, G and B picture images displayed in associated with the R, G and B projection picture tubes.
Claim 5
Dependent Claim
270 words
A convergence correction apparatus for a picture image display device, comprising: picture image projection means including red (R), green (G) and blue (B) monochrome projection picture tubes, for displaying a color picture image, each of which is provided with an anode and a convergence coil; means for receiving a composite video signal; means for separating a horizontal periodic pulse and a vertical periodic pulse from the composite video signal; convergence means responsive to the horizontal periodic pulse for generating R, G and B high voltage convergence signals to be applied to the another of the R, G and B projection picture tubes; means for detecting fluctuations of the R, G and B high voltage convergence signals; means for generating R, G and B high voltage ripple signals corresponding to the fluctuations associated with the R, G and B high voltage convergence signals; means for generating R, G and B convergence correction signals each including at least one of a horizontal periodic sawtooth wave signal, a vertical periodic sawtooth wave signal and a parabolic wave signal based on the horizontal periodic pulse and a vertical periodic pulse; means for adjusting the R, G and B convergence correction signals by arithmetically processing the R, G and B convergence correction signals with the R, G and B high voltage ripple signals; and means for supplying the R, G and B convergence coils of the R, G and B projection picture tubes with the adjusted R, G and B convergence correction signals to cancel distortions of R, G and B picture images displayed in associated with the R, G and B projection picture tubes.
References Cited (Backward Citations)
US4611151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-06-04 | 1999-12-04 | 2000-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-04 | 2003-12-04 | 2004-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-04 | 2007-12-04 | 2008-06-04 | $7700.00 | Window Closed / Lapsed |