Patent ID: 8362998

Claim:
A driving circuit comprising: a shift register which includes stages, each of which includes a flip-flop, each of the stages generating an input signal for the next flip-flop by an MOS type logical operation which uses an output signal of the flip-flop and at least one of a first clock signal and a second clock signal, and each of the stages generating, from the output signal of the flip-flop, an output signal of the shift register as a drive signal of a display panel, wherein: each of the stages includes a logical operation circuit for performing the logical operation, the logical operation circuit includes a first logical derivation stage to which the output signal of the flip-flop and at least one of the first clock signal and the second clock signal are input, the logical operation circuit further including a second logical derivation stage to which an output signal of the first logical derivation stage and at least one of the first clock signal and the second clock signal are input, based on the output signal of the flip-flop, a first conduction switching operation between a plurality of logical derivation paths which have different power source voltages used in deriving logic is hindered in the first logical derivation stage while the output signal of the flip-flop is inactive, the first conduction switching operation occurring with accordance to a periodic level change of at least one of the first clock signal and the second clock signal, based on the output signal of the first logical derivation stage, a second conduction switching operation between a plurality of logical derivation paths which have different power source voltages used in deriving logic is hindered in the second logical derivation stage while the output signal of the flip-flop is inactive, the second conduction switching operation occurring in accordance with a periodic level change of at least one of the first clock signal and the second clock signal, and the second logical derivation stage generates (i) the input signal for the next flip-flop and (ii) the output signal of the shift register as the drive signal of the display panel.