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

Claim 10:
11. 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 charge remover voltage compensation value based on the average data value;
a power controller configured to receive the charge remover voltage compensation value from the touch controller, and output a charge remover voltage based on the charge remover voltage compensation value; and
a touch driving circuit configured to receive the charge remover voltage from the power controller, sense a touch signal from each touch electrode and output a touch sensing value based on the charge remover voltage,
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;
a charge remover capacitor connected between an input terminal for receiving the charge remover voltage and the first input terminal of the OP amplifier; 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 charge remover capacitor is a variable capacitor and the charge remover voltage compensation value is used to adjust the charge remover capacitor for compensating the touch signal, and

wherein the charge remover voltage 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.