Touch Display Device and Method of Driving the Same

A method of driving a touch display device including a display panel configured to display an image, a touch sensor including a first touch electrode and a second touch electrode arranged to cross each other, and a dummy touch electrode disposed adjacent to the first touch electrode and the second touch electrode, on the display panel, and a touch driver configured to drive the first touch electrode and the second touch electrode and apply a signal or a voltage to the dummy touch electrode, the method comprising:

• generating an uplink signal to be transmitted to an active pen placed on the touch sensor;
• and
• sensing a downlink pulse generated from the active pen placed on the touch sensor,
• wherein the same signal as an uplink signal applied to the first touch electrode or the second touch electrode is applied to the dummy touch electrode during the uplink signal generation.

A touch display device comprising:

• a display panel configured to display an image;
• and
• a touch sensor on the display panel, the touch sensor including a first touch electrode, a second touch electrode arranged to cross the first touch electrode, and a dummy touch electrode disposed around the first touch electrode and the second touch electrode,
• wherein the dummy touch electrode is electrically connected to the first touch electrode or the second touch electrode in response to a dummy control signal being in a first state, and
• wherein the dummy touch electrode is electrically disconnected from the first touch electrode and the second touch electrode in response to the dummy control signal being in a second state.