PROBLEM TO BE SOLVED: To reduce power consumption of a driver circuit.SOLUTION: A signal array generation circuit SIG_ARY_GEN time-divides a plurality of voltage signals and outputs them as a first signal train sequentially, and outputs the plurality of voltage signals as a second signal train in parallel at the same time. A maximum value/minimum value detection circuit MAX_MIN_DETECT outputs a maximum signal corresponding to the approximate maximum of the plurality of the voltage signals and a minimum signal corresponding to the approximate minimum of the plurality of the voltage signals. A bias control circuit BIAS_GEN outputs a bias control signal which changes according to the difference between the maximum signal and the minimum signal. A driver circuit DRV_CIR receives the first signal train and the bias control signal and outputs a driver output voltage obtained by converting the first signal train with transconductance according to the bias control signal. A sample-and-hold circuit SHC repeats an operation of sampling the driver output voltage in a sample period and an operation of holding the driver output voltage in a holding period.
