Patent ID: 8730202

Claim:
A touch sensing apparatus adapted to a LCD panel, the touch sensing apparatus comprising: a plurality of capacitance touch sensors disposed in the LCD panel, each of the capacitance touch sensors having a touch sensing capacitor, each of the touch sensing capacitors having a first electrode and a second electrode, each of the capacitance touch sensors determining a value of an output current according to a distance between the first electrode and the second electrode of the touch sensing capacitor thereof; and a post-processing circuit electrically coupled to the capacitance touch sensors for performing an integration operation on the output currents to obtain a plurality of voltage values, the post-processing circuit further determining whether a touch event occurs according to a voltage difference between two voltage values corresponding to a first capacitance touch sensor and a second capacitance touch sensor of the capacitance touch sensors, so as to further determine whether to calculate a coordinate of a touch position; wherein there is a linear relation between a variation of each of the voltage values and a variation of the distance between the first electrode and the second electrode of a corresponding one of the touch sensing capacitors.