Semiconductor device, display device and method of operating the same

A display device, comprising:

• a display panel comprising a plurality of source lines;
• source output circuitry configured to:
• in a last horizontal sync period of a display period, drive a first source line of the plurality of source lines with a drive voltage having a first polarity based on first display data, and drive a second source line of the plurality of source lines with a drive voltage having a second polarity different from the first polarity based on second display data;
• and
• drive the first source line with a first dummy pulse having the first polarity in a transition period between the display period and a touch sensing period, the first dummy pulse having a voltage level based on the second display data;
• and
• touch sensing circuitry configured to perform touch sensing on the display panel in the touch sensing period after the display period.

A method of operating a display device, the method comprising:

• supplying a first drive voltage having a first polarity to a first source line of a display panel of the display device in a final horizontal sync period of a display period, the first drive voltage having a voltage level based on first display data;
• supplying a second drive voltage having a second polarity different from the first polarity to a second source line of the display panel in the final horizontal sync period, the second drive voltage having a voltage level based on a second display data;
• outputting a first dummy pulse having the first polarity to the first source line in a transition period following the display period, the first dummy pulse having a voltage level based on the second display data;
• driving the first and second source lines to a predetermined potential after the transition period;
• and
• performing touch sensing on the display panel in a touch sensing period following the transition period.