FIG. 4 is a graph showing a change in the output voltage of the second switch according to the voltage discharge of the capacitor, according to an embodiment of the present disclosure.

Hereinafter, the description of FIG. 4 is given based on the description provided with reference to FIGS. 2 and 3.

In the graph of FIG. 4, a horizontal axis represents a time and a vertical axis represents a voltage value.

A first waveform 410 is a waveform showing a change in a voltage discharged from the capacitor 134. That is, the first waveform 410 is a waveform showing a change in a voltage across the capacitor 134.

A second waveform 430 is a waveform showing a change in a voltage output from the reference point K1 of FIG. 3.

As can be seen from the first waveform 410, as the voltage charged in the capacitor 134 is discharged, the voltage across the capacitor 134 is reduced.

Accordingly, the discharged voltage is applied to the gate terminal G of the second switch 135, and thus the voltage measured at the reference point K1 may increase (see the second waveform).

As a result, the voltage measured at the reference point K1 may be a voltage that increases as the capacitor 134 is discharged.

If the voltage measured at the reference point K1 is a second voltage A, the processor 190 may determine that the cooling time of the display panel 150 is satisfied.