If the power is supplied to the processor 190, the processor 190 may determine whether the display panel 150 has satisfied the cooling time during a period of time during which the supply of power to the display panel 150 is interrupted, based on the signal output from the discharge circuit 130.

The processor 190 determines the cooling time if the power is supplied to the processor 190, because the processor 190 is not enabled if the power is not supplied to the processor 190, and thus, the processor 190 cannot determine whether the display panel 150 has satisfied the cooling time.

The DC power supply unit 131 may supply DC power to the discharge circuit 130. In particular, the DC power supply unit 131 may supply DC power to the first switch 133 or the second switch 135.

The DC power supply unit 131 may include the discharge circuit 130 as shown in FIG. 2, but this is merely an example. The DC power supply unit 131 may be present as a separate element from the discharge circuit 130.

The discharge control terminal 132 may apply, to the first switch 133, a signal capable of determining whether the capacitor 134 is charged or discharged under the control of the processor 190.

The discharge control terminal 132 may be a general port input/output (GPIO) output terminal.

The discharge control terminal 132 may determine whether to apply a high signal for turning on the first switch 133 according to whether the power is supplied to the display panel 150.