Display device

A display device, comprising:

• a display panel including pixels;
• a touch sensor on the display panel and including touch electrodes;
• a touch driver configured to drive the touch sensor at a first frequency, provide touch driving signals to the touch electrodes during a touch sensing period of a touch frame period, and stop providing the touch driving signals during a touch waiting period of the touch frame period;
• and
• a display driver configured to drive the display panel at a second frequency lower than the first frequency in a first mode, provide scan signals to the pixels during a display period of a display frame period, and stop providing the scan signals during a display waiting period of the display frame period, wherein when the display driver is switched from the first mode to a second mode, the display driver is configured to drive the display panel at a third frequency lower than the second frequency, and the touch driver is configured to increase the touch waiting period of the touch frame period,
• wherein when the display driver is driven in the first mode:
• the touch sensing period includes a mutual capacitance period and a self-capacitance period,
• during the mutual capacitance period, the touch driver is configured to provide the touch driving signals to some of the touch electrodes and sense variations in mutual capacitances between the touch electrodes based on touch sensing signals received from other touch electrodes, and
• during the self-capacitance period, the touch driver is configured to provide the touch driving signals to the touch electrodes and sense charge variations in the touch electrodes,
• when the display driver is driven in the second mode, the touch driver is configured to sequentially perform the touch waiting period, the mutual capacitance period, and the touch waiting period during a first touch frame period corresponding to a display period of the first display frame period and to sequentially perform the self-capacitance period and the touch waiting period during a second touch frame period that follows the first touch frame period.

An apparatus, comprising:

• a touch driver configured to drive a touch sensor of a display device,
• wherein the touch driver configured to:
• drive the touch sensor based on a first touch waiting period of a first touch frame period when a display driver of the display device is in a first mode, and
• drive the touch sensor based on a second touch waiting period of a second touch frame period when the display driver is in a second mode, wherein the first touch waiting period is of a different duration from the second touch waiting period and wherein the touch driver is configured to drive the touch sensor at a frequency different from at least one frequency of the display driver in the first mode or the second mode,
• wherein when the display driver is in the first mode, the touch driver is configured to sequentially perform a self-capacitance period, a mutual capacitance period, and the first touch waiting period during the first touch frame period.