Patent ID: 8654083

Claim:
A touch screen comprising an in-plane-switching (IPS) liquid crystal display with integral touch sensing, the touch screen comprising: a first substrate having display control circuitry formed thereon, the display control circuitry comprising a pair of electrodes for each display pixel, the pair of electrodes operative for in-plane-switching; a second substrate adjacent the first substrate; a liquid crystal layer disposed between the first and second substrates; a plurality of touch sensing elements wherein each touch sensing element comprises a first electrode and a second electrode forming the pair of electrodes for each of the display pixels, the first electrode and the second electrode spaced apart from one another and operative in a display mode of operation and in a touch sensing mode of operation; one or more transistors disposed on the first substrate for switching the mode of operation between the display mode of operation and the touch sensing mode of operation, one or more gate lines exclusively for controlling the one or more transistors; in the display mode of operation, for each pair of electrodes, the first electrode, serving as a common electrode and receiving a common voltage modulation signal, and the second electrode coupled to receive LCD display data over a display data line; in a touch sensing mode of operation, for each pair of electrodes, the first electrode receiving a stimulation signal over a touch drive line, and the second electrode coupled to a capacitance measuring circuit over a touch sense line; and wherein, for each pixel, the display data line, used for display data in the display mode of operation, is used as the touch sense line in the touch sensing mode of operation.