Title:
WAVEFORM GENERATOR FOR CONTROLLING AN ELECTRON BEAM IN A CATHODE RAY TUBE
Document Type and Number:
WIPO Patent Application WO2003090450
Kind Code:
A3
Abstract:
A parabola generator for providing dynamic correction includes a capacitor (C201) source of a parabolic input signal (18H) at a frequency related to a horizontal deflection frequency coupled to a first terminal of the capacitor (C201)(Fig. 1C). A diode switch (D203) is coupled to a voltage at a reference level and to a second terminal of the capacitor (C201) for periodically clamping a peak level of a signal developed at the second terminal. A transistor switch (Q401) is responsive to a periodic switch control signal and coupled to the second terminal capacitor (C201) for periodically clamping a signal applied from the second terminal, during retrace, for removing a parasitic parabolic voltage portion to generate a dynamic correction signal. The dynamic correction signal is coupled to a cathode ray tube to vary a field in a beam path of an electron beam of the cathode ray tube for providing dynamic correction.
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Inventors:
GEORGE JOHN BARRETT (US)
Application Number:
PCT/US2003/012178
Publication Date:
April 01, 2004
Filing Date:
April 21, 2003
Export Citation:
Assignee:
THOMSON LICENSING SA (FR)
GEORGE JOHN BARRETT (US)
GEORGE JOHN BARRETT (US)
International Classes:
G05F1/00; G05F1/14; G09G1/00; G09G1/04; H04N3/26; (IPC1-7): H01J29/58; H01J29/70
Foreign References:
| US4560910A | 1985-12-24 | |||
| US5705900A | 1998-01-06 | |||
| US3757162A | 1973-09-04 | |||
| US6504326B2 | 2003-01-07 | |||
| US4500816A | 1985-02-19 | |||
| US4184104A | 1980-01-15 |
Other References:
See also references of EP 1497970A4
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