A display driving device includes a high voltage operating unit obtaining an operating current according to the application of the high power supply voltage from the first voltage application line; a low voltage operating unit that operates according to an application of a low power supply voltage to control the high voltage operating unit; a recycling circuit that receives the operating current from the high voltage operating unit via a relay coupling line and applies the low power supply voltage to the low voltage operating unit while supplying the received operating current to a reference potential line via the low voltage operating unit; and a current bypass circuit that flows a part of the operating current flowing through the relay coupling line into the reference potential line without supplying the part of the operating current to the recycling circuit according to a voltage increase in the low power supply voltage.