Patent ID: 11861111
Assignee: LG DISPLAY CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 8:
9. A touch sensing display device comprising:
a display panel including a plurality of touch electrodes and a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines;
a timing controller configured to output an average data value and a touch synchronization signal in which a plurality of display driving periods and a plurality of touch driving periods are alternately time-divided;
a touch controller configured to receive the average data value from the timing controller, and output a gain compensation value based on the average data value; and
a touch driving circuit configured to receive the gain compensation value from the touch controller, sense a touch signal from each touch electrode and output a touch sensing value based on the gain compensation value,
wherein the touch driving circuit includes:
an amplifier configured to receive the touch signal from each touch electrode through a first input terminal and a reference voltage through a second input terminal, amplify the touch signal, and output the touch sensing value; and
a feedback capacitor connected between the first input terminal and an output terminal of the OP amplifier to adjust amplification gain of the OP amplifier,

wherein the feedback capacitor is a variable capacitor whose capacitance varies according to the gain compensation value, and
wherein the gain compensation value is set to be low when the average data value is a low grayscale, and is set to be high when the average data value is a high grayscale.