Touch controller, operating method of the same, and touch sensing device including touch controller

A touch sensing device comprising:

• a touch sensor array including a plurality of sensing electrodes stacked on a display panel and arranged in rows and columns;
• and
• a touch controller connected to the touch sensor array via the plurality of sensing electrodes,
• wherein the touch sensor array comprises:
• a first electrode and a second electrode arranged on lines except a line on which touch sensing is performed, among the plurality of sensing electrodes;
• and
• a third electrode arranged on the line on which the touch sensing is performed, among the plurality of sensing electrodes, and
• wherein the touch controller comprises:
• a noise detection circuit configured to respectively provide a first reference voltage and a second reference voltage for detecting display noise to the first electrode and the second electrode, the second reference voltage being different from the first reference voltage;
• a driving signal generation circuit configured to receive a first noise voltage and a second noise voltage that are generated based on the first reference voltage and the second reference voltage from the first electrode and the second electrode, respectively, and alternately select the first noise voltage and the second noise voltage as a driving signal and output the driving signal;
• and
• a receiving circuit configured to receive the driving signal via a first input terminal, receive a touch sensing signal generated based on the driving signal via a second input terminal connected to the third electrode, and generate a sensing voltage based on the touch sensing signal and the driving signal.

An operating method of a touch controller configured to drive a touch sensor array comprising a plurality of sensing electrodes stacked on a display panel, and arranged in rows and columns, the operating method comprising:

• providing respectively a first reference voltage and a second reference voltage for detecting display noise to a first electrode and a second electrode arranged on lines except a line on which touch sensing is performed, among the plurality of sensing electrodes, the second reference voltage being different from the first reference voltage;
• receiving a first noise voltage and a second noise voltage generated based on the first reference voltage and the second reference voltage from the first electrode and the second electrode, respectively;
• selecting alternately the first noise voltage and the second noise voltage as a driving signal and outputting the driving signal;
• receiving the driving signal from a first input terminal, and receiving a touch sensing signal generated based on the driving signal via a second input terminal connected to a third electrode arranged on the line on which touch sensing is performed, among the plurality of sensing electrodes;
• and
• generating a sensing voltage based on the touch sensing signal and the driving signal.