Display device and a touch sensing system including the same

A touch sensing system, comprising:

• a display device comprising a display panel in which a plurality of pixels are arranged in an image display area, and a display driving circuit configured to drive the pixels;
• a first touch sensing unit disposed on a surface of the display panel to sense a touch by a user's body part;
• a second touch sensing unit disposed on a surface of the first touch sensing unit to sense a touch of an electronic pen;
• and
• a touch sensing circuit configured to generate touch coordinate data by detecting a touch position of the electronic pen,
• wherein the touch sensing circuit is configured to drive pen touch electrodes so that the electronic pen is electromagnetically charged through the pen touch electrodes, and to recognize a touch and a touch position of the electronic pen by detecting a variation of a pen touch sensing signal of the pen touch electrodes,
• wherein the pen touch electrodes comprise:
• first pen touch electrodes arranged in parallel with each other in a first direction;
• and
• second pen touch electrodes arranged in parallel with each other in a second direction crossing the first direction,
• wherein the touch sensing circuit comprises:
• at least one driving signal supply unit configured to supply a pulse type pen touch driving signal to the first and second pen touch electrodes;
• and
• at least one signal analysis circuit unit configured to detect an amplitude variation of pen touch sensing signals output from the first and second pen touch electrodes.

A display device, comprising:

• a display panel in which a plurality of pixels are arranged in an image display area;
• a touch sensing unit disposed on the display panel, wherein the touch sensing unit includes first touch electrodes arranged in a first direction and second touch electrodes arranged in a second direction, and wherein the touch sensing unit is configured to sense a touch of an electronic pen;
• a display driving circuit configured to drive the pixels, and
• a touch sensing circuit configured drive the first and second touch electrodes so that the electronic pen is electromagnetically charged, and to recognize a touch position of the electronic pen by detecting variations of touch sensing signals of the first and second touch electrodes,
• wherein the touch sensing circuit comprises:
• a driving signal supply unit configured to supply a pulse type pen touch driving signal to the first and second touch electrodes;
• and
• a signal analysis circuit unit configured to detect an amplitude variation of the touch sensing signals output from the first and second touch electrodes.