Driving circuit, touch display device, and driving method thereof

A driving circuit of a touch display device comprising:

• a touch power integrated circuit including at least one of a common voltage output circuit generating a touch driving signal to be applied to a plurality of touch electrodes and a first signal to be applied to a plurality of data lines during a touch sensing period in which the touch sensing is performed and a gate low voltage output circuit generating a second signal to be applied to a plurality of gate lines during the touch sensing period,
• wherein when the touch power integrated circuit includes the common voltage output circuit, the common voltage output circuit includes:
• a low-level common voltage generation circuit generating a low-level common voltage;
• a high-level common voltage generation circuit generating a high-level common voltage;
• and
• a first multiplexer outputting the first signal in an alternating signal waveform based on the high-level common voltage and the low-level common voltage, and wherein the low-level common voltage generation circuit generates the low-level common voltage by receiving the high-level common voltage or the high-level common voltage generation circuit generates the high-level common voltage by receiving the low-level common voltage;
• wherein when the touch power integrated circuit includes the gate low voltage output circuit, the gate low voltage output circuit includes:
• a low-level gate low voltage generation circuit generating a low-level gate low voltage;
• a high-level gate low voltage generation circuit generating a high-level gate low voltage;
• and
• a second multiplexer outputting the second signal in the alternating signal waveform based on the high-level gate low voltage and the low-level gate low voltage, and wherein the low-level gate low voltage generation circuit generates the low-level gate low voltage by receiving the high-level gate low voltage or the high-level gate low voltage generation circuit generates the high-level gate low voltage by receiving the low-level gate low voltage.

A touch display device comprising:

• a display panel, with a touchscreen panel including a plurality of touch electrodes being embedded therein;
• a gate driving circuit supplying a gate signal to a plurality of gate lines;
• a data driving circuit supplying a data signal to a plurality of data lines;
• a touch driving circuit supplying a touch driving signal to the display panel and performing touch sensing in accordance with a signal received in response to the touch driving signal;
• and
• a touch power integrated circuit supplying a signal for the touch sensing to the touch driving circuit,
• wherein the touch power integrated circuit includes:
• a common voltage output circuit generating the touch driving signal to be applied to the touch electrodes and a first alternating signal to be applied to the data lines during a touch sensing period in which the touch sensing is performed;
• a gate low voltage output circuit generating a second alternating signal to be applied to the gate lines during the touch sensing period;
• and
• a trimming circuit applying a deviation in a reference gate low voltage to the gate low voltage output circuit using a common voltage generated by the common voltage output circuit or applying the deviation in the reference common voltage to the common voltage output circuit using a gate low voltage generated by the gate low voltage output circuit.