MULTI MODE DYNAMIC BEAM LANDING CORRECTION CIRCUIT

摘要

PURPOSE: A beam landing distortion correction arrangement is provided to improve a defect and distortion such as defocusing and nonlinearity of a cathode ray tube. CONSTITUTION: The correction arrangement comprises: (a)a cathode ray tube including a focus electrode; (b)a amplifier with a fist input responding the focus voltage correction input signal for generating a dynamic focus voltage of the focus voltage coupled to the focus electrode from the amplifier; (c)a first semiconductor switch connected to a signal route of the focus correction input signal for disabling the dynamic focus voltage and responding to a parabola controlling signal during a period measuring automatic kine bias; and (d)a second semiconductor switch coupled to the amplifier for transmitting the second input signal to a second input and responding to a parabola controlling signal during a period measuring automatic kine bias.