PURPOSE: To select and output a phase-locked signal from a phase-locked circuit and to generate a driving signal with a prescribed timing at a timing signal generation part based on the output in the case where a horizontal synchronizing signal can not be separated in the synchronizing separator due to noise or the like.

CONSTITUTION: The device consists of a synchronizing separator 2 separating a horizontal synchronizing signal from a video signal input, phase-locked circuit 3 outputting a phase-locked signal subjected to phase-locking with the horizontal synchronizing signal inputted from the separator 2, and synchronizing signal detection circuit 10 consisting of gate circuits 4, 8, and 9 inputting the output from the separator 2 and the circuit 3 and selecting the phase-locked signal when no horizontal synchronizing signal is detected at the output and multivibrators 5 and 6. Based on the output from the circuit 10, the driving signal is outputted from the timing signal generation part in the prescribed timing.