A display driver (10) includes a power supply circuit (60) that generates at least one power supply voltage, a drive circuit (20) that drives an electro-optical panel (150) based on the at least one power supply voltage, and a control circuit (50) that controls the power supply circuit (60) based on a control signal, a first monitoring circuit (M1) that monitors the control signal on the control circuit (50) side, and a second monitoring circuit (M2) that monitors the control signal on the power supply circuit (60) side.