PURPOSE: To save the power for a hybrid integrated circuit by switching the power supply of the own integrated circuit from the drivable state into the stand-by state only when a control signal is outputted from one integrated circuit and switching the power supply of the integrated circuit driven later for a prescribed number from the stand-by state into the drivable state.

CONSTITUTION: A control signal is outputted to a terminal Pwo at the end of a shift register 2, the control signal is inputted to a terminal Pwl of the integrated circuit arranged at the right side at the next adjacent position and becomes a control input to supply the normal current to amplifiers A1∼Ai from the constant current source 3 in the integrated circuit. The input is given to a point of time when the integrated circuit operated precedingly starts it operation to raise the amplifier from the standby state into the drivable state with a sufficient time margin. Moreover, at the end of the shift operation of the shift register, the control signal is inputted also to the constant current source 3 of the own integrated circuit, the signal acts like a signal restoring the constant current source 3 to the original stand-by state because the operation is finished.