An operating method of a display device includes: forming a plurality of capacitors between a plurality of monitor lines of a display device and a plurality of power lines of the display device via a plurality of light-emitting diodes; and performing touch sensing by using the capacitors. The light-emitting diodes are arranged in a matrix. A plurality of control switches of the display device is arranged in the matrix, and is electrically coupled to a plurality of first terminals of the light-emitting diodes, respectively. The monitor lines are electrically coupled to the first terminals of the light-emitting diodes, respectively. The power lines are electrically coupled to a plurality of second terminals of the light-emitting diodes, respectively.