| 摘要 |
PURPOSE:To ensure a stable deflecting operation by stably synchronizing a corrected waveform in which a transient waveform is not generated in principle to a screen corresponding to the shortening of a fly-back period, in the pincushion distortion correcting circuit of a cathode-ray tube display device. CONSTITUTION:A triangular wave form is directly generated by a triangular wave form generator 31 constituted of a flip flop 19, voltage control type constant current source 14, and current switching circuit 15, and capacitor 16, etc. Then, the current value of the constant current circuit of the triangular wave form generator 31 is controlled by the output voltage of a phase synchronizing circuit 32 by using the phase synchronizing circuit 32 for the triangular wave generator 31. The phase synchronizing circuit 32 is constituted of a phase comparator 11 which generates the first or second output base on whether a comparison pulse (output of the flip flop) is forwarding or delayed than a reference pulse (screen synchronizing signal), change pump 12 in which currents inflow or outflow according to the first or second output, and low pass filter 13 which used the output currents of the charge pump 12 as the input currents. |
