Display device and method of driving the same

A method of driving a display device including:

• pixels each of which is connected to a first power line and a second power line;
• and a power supply which, in a first display mode, supplies a first power voltage to the first power line and supplies a second power voltage to the second power line, the method comprising:
• changing a power control signal from a first logic level to a second logic level;
• detecting a magnitude of the second power voltage;
• checking whether the second power voltage is greater than a first reference voltage at a first time point;
• checking whether the second power voltage is greater than a second reference voltage at a second time point after the first time point in a case where the second power voltage is greater than the first reference voltage at the first time point;
• and
• shutting down a first power supply and a second power supply of the power supply in a case where the second power voltage is greater than the second reference voltage at the second time point, wherein the first power supply generates the first power voltage, and the second power supply generates the second power voltage.