Salcomp Oy

Nokia Corporation

Kari Vigelius

Sami Vilhonen

Jarmo J Heinonen

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).

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Salo, Finland

Kari Vigelius