To realize low power consumption without shortage of an output current ability of a signal electrode driving circuit group.

An output current ability of the signal electrode driving circuit group 16 is increased or decreased according to the analog output voltage levels by arranging a signal level comparison circuit 10, detecting a potential difference between the video signal level outputted from a video signal processing circuit 12 and a counter signal level outputted from a counter electrode driving circuit 11 for a period of transmitting sample-held video signals to signal electrodes, generating an analog output voltage proportional to this potential difference, and supplying this analog output voltage to the signal electrode driving circuit group 16 as an output current ability control signal.