Power consumption is reduced in a driving circuit of a display device capable
of handling a low voltage amplitude input signal by employing level shifters that
utilize a differential amplifier. The driving circuit is divided into a plurality
of units and each unit is provided with a constant current source. In addition
to a usual scanning circuit, there is provided a sub-scanning circuit for controlling
ON/OFF of the constant current source arranged in each unit. The sub-scanning circuit
turns ON only the constant current sources in the unit that is being scanned. A
current thus can be supplied efficiently.
