Display device and method for operating display device

A display device comprising:

• a first transistor controlled by a first control signal, wherein the first transistor is to connect an input terminal to which an input voltage is applied and a first node;
• a second transistor controlled by a second control signal, wherein the second transistor is to connect a second node to which a power supply voltage is outputted and the first node;
• an overcharge recognition circuit configured to receive a reference voltage and a feedback reference voltage in order to determine whether a circuit is overcharged, and to output an overcharge recognition signal;
• and
• a discharge circuit configured to provide a first discharge path for discharging the power supply voltage based on an enable signal which is generated depending on the overcharge recognition signal.

An operating method of a display device, the method comprising steps of:

• receiving a value of a panel load;
• determining the value of the panel load;
• charging an inductor of a power management integrated circuit (PMIC) and adjusting charging and discharging times of the inductor of the PMIC by controlling a discharge rate of a power supply voltage when the value of the panel load exceeds a threshold value;
• and
• charging the inductor of the PMIC and adjusting charging and discharging times of the inductor of the PMIC by controlling the discharge rate of the power supply voltage through a discharge circuit of the PMIC when the value of the panel load is less than or equal to the threshold value.