Display device and driving method thereof

A method for operating a touch display device, the method comprising:

• generating, by a controller, a touch sync signal for controlling timing of a touch sensing period and a display period in each of a plurality of frames, the touch sensing period and the display period alternating with each other;
• sequentially supplying gate pulses to gate lines of a touch panel during the display period by sequentially driving a gate high voltage from a gate high voltage supply line onto the gate lines for a pulse period and otherwise driving a gate low voltage from a gate low voltage supply line onto the gate lines, the gate high voltage supply line and the gate low voltage supply line in a non-display area of the touch panel;
• supplying, by a touch sensing circuit, a touch drive signal to a plurality of touch electrodes in a display area of the touch panel during the touch sensing period;
• supplying during the touch sensing period by a touch assistance signal supply circuit, a touch assistance signal on at least one of the gate high voltage supply line and the gate low voltage supply line, the touch assistance signal mimicking the touch drive signal during the touch sensing period;
• generating, by the plurality of touch electrodes, touch sensing signals indicating whether or not a touch occurred during the touch sensing period;
• and
• detecting, by the touch sensing circuit, if the touch occurred during the touch sensing period based on the touch sensing signals received from the plurality of touch electrodes.

A touch display device, comprising:

• a touch panel having a display area and a non-display area surrounding the display area, the touch panel having a plurality of touch electrodes in the display area to generate touch sensing signals indicating whether or not a touch occurs during a touch sensing period, the plurality of touch electrodes including center touch electrodes and edge touch electrodes disposed at edges of the display area between the center touch electrodes and the non-display area;
• a gate low voltage supply line disposed in the non-display area of the touch panel, the gate low voltage supply line supplying a gate low voltage during a display period;
• a gate high voltage supply line disposed in the non-display area of the touch panel, the gate high voltage supply line supplying a gate high voltage during the display period;
• a gate driver to sequentially supply gate pulses to gate lines of the touch panel during the display period by alternately driving the gate high voltage from the gate high voltage supply line onto the gate lines for a pulse period of the gate pulse and otherwise driving the gate low voltage from the gate low voltage supply line onto the gate lines;
• a touch sensing circuit to supply a touch drive signal to the plurality of edge touch electrodes and to detect if the touch occurred based on the touch sensing signals received from the plurality of touch electrodes;
• and
• wherein at least one of the gate high voltage supply line and the gate voltage supply line is to supply a touch assistance signal during the touch sensing period, the touch assistance signal mimicking the touch drive signal applied to the edge touch electrodes during the touch sensing period.