Display system having touch driver configured to transmit uplink signals, and method of driving display device

A display system comprising:

• a display device comprising a display panel including pixels, and a touch array on the display panel and including touch electrodes, the display device being configured to operate in a unit of a frame period including an active period and a blank period and to display an image on the display panel in the active period of the frame period, based on image data;
• and
• an external device configured to communicate with the display device through the touch array,
• wherein the display device is configured to transmit, in an uplink period, uplink signals including different information to the external device in proximity to the touch array through the touch electrodes, to receives, from the external device, a sensing signal generated by the external device using at least some of the uplink signals, and to determine the uplink period based on the image data, and
• wherein the external device is configured to generate the sensing signal using the uplink signals received through the touch electrodes in the uplink period,
• wherein the display device is configured to determine the uplink period with reference to grayscale levels of data pixels in the image data.

A method of driving a display device configured to operate in a unit of a frame period including an active period and a blank period and display an image on a display panel in the active period of the frame period, based on image data,

• the display device comprising the display panel including pixels, and a touch array on the display panel and including touch electrodes,
• the method comprising:
• determining an uplink period in which uplink signals including different information are transmitted through the touch electrodes based on the image data,
• wherein the uplink period is determined with reference to grayscale levels of data pixels in the image data;
• transmitting the uplink signals to an external device in proximity to the touch array in the uplink period;
• and
• receiving, from the external device, a sensing signal generated by the external device using at least some of the uplink signals.