In the touch sensing periods, a data voltage Vdata, the voltage and phase of which are the same as those of the touch driving signal TDS, may be supplied to the data lines DL during the touch sensing periods. Here, since a gate low voltage VGL is applied to the gate lines during the touch sensing periods, a signal (e.g. gate low voltage VGL) may be supplied to the gate lines so as to have the same voltage and phase as the touch driving signal TDS.

As described above, due to the supply of the alternating signal, the voltage and phase of which are the same as those of the touch driving signal TDS, to the gate lines, the data lines DL, and the like during the touch sensing periods, parasitic capacitance between the touch electrodes TE and the signal lines may be prevented, thereby improving the ability to detect the touch sensing signals TSS.

The touch display device 100 may simultaneously perform the display driving and the touch sensing.

FIG. 3 is another timing diagram of the display driving and the touch sensing performed in the touch display device according to embodiments, in a case in which the display driving period and the touch sensing period are simultaneously performed.

Referring to FIG. 3, the touch display device 100 according to embodiments may simultaneously perform the display driving period and the touch sensing period.

Here, the touch sensing period may be the same as the display driving period or may be a blank period between the display driving periods. That is, the touch sensing period may be independently performed, irrespective of the display driving period, so that the touch sensing period and the display driving period may be simultaneously performed.