Display system utilizing cathode ray tube deflection error compensating means

Claim 1

IN A DISPLAY SYSTEM, A CATHODE RAY TUBE HAVING A FLUORESCENT FACE AND AN ELECTRON GUN FOR DIRECTING A BEAM OF ELECTRONS TOWARD THE FACE, A DEFLECTION YOKE DISPOSED BETWEEN THE GUN AND THE FACE FOR DEFLECTING THE ELECTRON BEAM ACROSS THE FACE IN ACCORDANCE WITH THE INTRODUCTION OF A SIGNAL TO THE YOKE, A DEFLECTION CHANNEL INTERCONNECTED WITH THE YOKE FOR INTRODUCING A SIGNAL TO THE YOKE TO OBTAIN A DEFLECTION OF THE BEAM, AN INPUT TO SAID CHANNEL FOR RECEIVING A DEFLECTION SIGNAL TO PROVIDE A DEFLECTION OF THE BEAM THROUGH A DISTANCE THAT IS A COMBINATION OF A PARTICULAR LINEAR COMPONENT AND A PARTICULAR NON-LINEAR HIGHER ORDER COMPONENT OF THE SIGNAL, AND MEANS INCLUDING A NON-LINEAR COMPENSATOR CONNECTED ACROSS THE CHANNEL, SAID COMPENSATOR BEING RESPONSIVE TO THE AMPLITUDE OF THE DEFLECTION SIGNAL IN THE CHANNEL TO PROVIDE FOR THE DEFLECTION SIGNAL A COMPENSATION CORRESPONDING TO THE PARTICULAR NON-LINEAR HIGHER ORDER FUNCTION OF THE DEFLECTION SIGNAL.