Patent ID: 8427435

Claim:
A touch screen apparatus, comprising: a touch line; and a plurality of touch sensors coupled to the touch line, wherein each of the plurality of touch sensors comprises: a first node; a sensor capacitor operatively coupled to the first node for changing an electrical state of the first node depending on a respective touch action; a reference capacitor operatively coupled to the first node; a first switch having at least two respective terminals, the first switch being interposed between and coupled by way of two of the respective terminals thereof respectively to the first node and to the touch line such that when the first switch is activated, it provides a sensing signal from the first node to the touch line; and a second switch having at least two respective terminals, the second switch being interposed between and coupled by way of two of the respective terminals thereof to the first node and to a reference voltage providing node such that when the second switch is activated, it supplies a reference voltage to the sensor capacitor and it simultaneously discharges or charges the reference capacitor.