Abstract: A method of projected capacitance touch sensing on a display includes updating the display by applying a drive waveform to each pixel of the display over a plurality of frame periods to update a pixel state. The updating includes selecting each row of the display in turn and repeating a frame update to drive pixels with successive time slices of the drive waveforms. The method further includes sensing a signal from a projected capacitance touch sensing electrode of the display during a sensing interval to provide a touch sensing response; identifying when column drive levels of the drive waveforms for pixels of one selected row change by more than a threshold level between the selected row and a next selected row; and inhibiting the touch sensing responsive to the column drive row change signal indicating a greater than the threshold level change of the drive levels between the selected rows.

Abstract: A method of projected capacitance touch sensing on a display screen, the method comprising: updating said display screen by applying a drive waveform to each pixel of the display screen over a plurality of frame periods, wherein a said drive waveform for a pixel defines a transition of the pixel from a current pixel state to an updated pixel state over said plurality of frame periods, and wherein said updating comprises selecting each row of said display screen in turn for a row driving period and driving columns of the display screen with a time slice of drive waveforms for pixels of the row to perform a frame update of said display screen, and repeating said frame update to drive pixels of said display with a plurality of successive time slices of said drive waveforms to drive said pixels with said drive waveforms; sensing a signal from a projected capacitance touch sensing electrode of said display screen during a sensing interval, and using said sensing to provide a touch sensing response; identifying whe

Abstract: We describe a projected capacitance touch screen sensing system comprising: a plurality of touch sensing circuit modules each configured to interpolate between sensed touching of a plurality of adjacent electrodes simultaneously and to output corresponding interpolated touch sense data at a resolution greater than that of a spacing between said electrodes; wherein each of said row and column electrodes has a break to divide the electrode into portions, one of said portions having an electrical connection at one side of the display screen, the other of said portions having an electrical connection at an opposite side of the screen; the sensing system comprising a controller coupled to touch sense data outputs of first to fourth touch sensing circuit modules, said controller configured to select interpolated touch sense data from one of first and second modules to provide row interpolated touch sense data, wherein selection of said first and second modules is responsive to interpolated touch sense data from sai