TOUCH SENSING CIRCUIT

摘要

PURPOSE: A touch sensing circuit for sensing touch is provided to efficiently remove noise of a display device by allowing a differential amplifier which removes a common mode to sense the variation of a coupling capacitance. CONSTITUTION: A differentiator(310) receives an operating signal applied to a first driving electrode or a second driving electrode and generates first and second differential signals. An amplifier(320) receives first and second differential signals and outputs a differential amplifying signal. A detector(330) receives the amplifying signal and outputs a detecting signal. Difference between first coupling capacitance and a second coupling capacitance is sensed.