Bi-directional scan circuit.

摘要

At a horizontal deflecting circuit of bi-directional deflection, timings of deflection of forward scan path along a backward scan path are respectively controlled. The timing of deflection along forward path or backward path is controlled at the first timing control circuit 22 so that it is synchronized with the horizontal synchronizing signal HD and timing of deflection along backward path or forward path is controlled at the second timing control circuit 24 so that deflection cycles of forward path and backward path are equalized. Further, timings of deflection of forward scan path and backward scan path are controlled respectively at first and second phase comparison circuits 22 and 24 so that the relation in phase between the image signal and the deflection takes a constant value on the basis of the horizontal synchronizing signal, to previously prevent occurrence of steady phase error. <IMAGE>