LG Display Co., Ltd.
Touch driving circuit driving touch electrode, touch controller controlling touch driving circuit, and touch display device including touch driving circuit and touch controller

Abstract:

Exemplary embodiments of the present disclosure relate to a touch driving circuit that operates according to an internal clock signal and a touch controller that calibrates a variation in internal clock signal between touch driving circuits. The touch driving circuit operates using an internal clock signal, thus preventing electromagnetic interference caused by a clock signal line that connects the touch controller and a plurality of touch driving circuits. Further, the touch controller calibrates the output frequencies of internal clock signals of the respective touch driving circuits to be the same on the basis of the counting values of the internal clock signals of the touch driving circuits, which are obtained during a certain period before performing touch sensing, and performs touch sensing, thereby performing touch sensing while controlling the plurality of touch driving circuits operating with the internal clock signals without any operational variation.