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US 5,352,959 AGranted
Method and circuit for generating the control voltages of the dynamic convergence in a color display tube
AssigneeSalcomp Oy
InventorKari Vigelius
Life of this patent
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AssigneeSalcomp Oy
InventorKari Vigelius
Estimating the term…
A method and a circuit for generating the control voltages of the dynamic convergence in a color display tube, in which the current of the convergence coils (HC, VC) is controlled. The control voltages for the convergence coils (HC, VC) are obtained from several controlling means (1-16). A voltage independent of the horizontal and vertical deflection frequencies is switched to the control means.(1-16). The voltage from each controlling means (1-16) is switched to the coils (HC, VC) by signals (f.sub.ch, f.sub.cv) synchronized to the horizontal and vertical deflection pulses (f.sub.h, f.sub.v), whereby the convergence of different parts (a1-a16) of the display is controlled by a voltage provided by a separate controlling means (1-16).
A method for generating the control voltages of the dynamic convergence in a color display tube, in which a current in a plurality of convergence coils is controlled and in which an electron beam is controlled by a plurality of horizontal and vertical deflection voltages, characterized in that the control voltages for the plurality of convergence coils are obtained from a plurality of respective controlling means, to which a voltage is coupled from at least one voltage supply, the magnitude of the voltage of the at least one voltage supply being independent of the horizontal and vertical deflection voltages, and that the voltage from each controlling means is switched to said plurality of convergence coils by a plurality of signals synchronized to the horizontal and vertical deflection voltages, and the convergence of a plurality of different non-overlapping parts of the display is controlled by a voltage provided by a separate controlling means for each part of the display.
A circuit for generating the control voltages of the dynamic convergence in a color display tube comprising a plurality of convergence coils with a current being controlled and an electron beam controlled by horizontal and vertical deflection voltages having respective horizontal and vertical deflection frequencies f.sub.h, f.sub.v, characterized in that the circuit contains means to generate a signal f.sub.ch, and a signal f.sub.cv, synchronized to the horizontal and vertical deflection frequencies f.sub.h, f.sub.v respectively, and a circuit controlling the coils and comprising:
Dependencies are inferred from the claim text.