Patent ID: 8552989

Claim:
An integrated display touch screen having a plurality of display pixels comprising: a first polarizer; a second polarizer; a first substrate having display control circuitry formed thereon, the first substrate being disposed between the first polarizer and the second polarizer and adjacent the first polarizer; a second substrate disposed between the first polarizer and the second polarizer and adjacent the first substrate; a color filter disposed directly or indirectly on the second substrate; a first plurality of touch sensing elements disposed between the first and second substrate; and a second plurality of touch sensing elements disposed between the first and second polarizers but not between the first and second substrates; the first plurality of touch sensing elements comprising a plurality of touch drive electrodes disposed along a first direction and the second plurality of touch sensing elements comprising a plurality of touch sense electrodes disposed along a second direction transverse to the first direction such that capacitive coupling nodes are formed at the crossing of the plurality of touch drive and touch sense electrodes; wherein: a touch stimulation waveform is provided exclusively to the plurality of touch drive electrodes such that the plurality of touch drive electrodes are used exclusively for applying the touch stimulation waveform to the capacitive coupling nodes during a touch sensing mode of operation and, during the touch sensing mode of operation, the plurality of touch sense electrodes exclusively connect the capacitive coupling nodes to capacitive sensing circuitry such that the touch sense electrodes are used exclusively for touch sensing during the touch sensing mode of operation; and the plurality of touch drive electrodes also serving as a display element for the integrated display touch screen during a display mode of operation, the display element operative to provide a voltage waveform different from the touch stimulation waveform during the display mode of operation.