Patent ID: 7518648

Claim:
A horizontal register transfer pulse generation circuit comprising: phase adjustment means for generating an output signal, subjected to predetermined phase adjustment, from a reference signal by means of which a horizontal register transfer pulse is generated; and horizontal blanking period generation means for generating a horizontal register transfer pulse provided with a horizontal blanking period, based on said output signal, said reference signal, and a horizontal blanking pulse, wherein said horizontal blanking period generation means includes: a delay masking pulse generation means for generating a delay masking pulse which is delayed by a predetermined phase relative to a masking pulse generated based on the horizontal blanking pulse inputted into said horizontal blanking period generation means; and determination means for determining a phase difference between said output signal and said reference signal, when the phase difference between said output signal and said reference signal is less than the predetermined phase as a result of the determination by said determination means, said horizontal blanking period generation means combines said masking pulse with said output signal to generate a horizontal register transfer pulse provided with a horizontal blanking period, and when the phase difference between said output signal and said reference signal is equal to or greater than the predetermined phase, said horizontal blanking period generation means combines said delay masking pulse with said output signal to generate a horizontal register transfer pulse provided with the horizontal blanking period.