Patent ID: 6274989
Filing Date: 2001-08-14
Classification: H04N

Abstract:
A video display deflection apparatus, comprising:a source of a first signal at a frequency related to a horizontal deflection frequency;a horizontal deflection winding coupled to a retrace capacitance and to a switch, responsive to said first signal, for generating a horizontal deflection current in said horizontal deflection winding;an S-shaping capacitor coupled to said horizontal deflection winding for developing a voltage in said S-shaping capacitor that varies in a manner to provide horizontal linearity distortion correction;a source of a second signal that varies at a frequency related to a vertical deflection frequency coupled to said S-shaping capacitor for varying said S-shaping capacitor voltage in accordance therewith for providing East-West distortion correction; anda third capacitor coupled to a rectifier to form a clamp circuit for clamping said S-shaping capacitor voltage, during a portion of a horizontal period, said third capacitor having a first terminal coupled to said S-shaping capacitor and a second terminal coupled to said second signal source for developing, from said second signal, voltage variations at each of said first and second terminals of said third capacitor that compensate each other.