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Touch-sensing systems

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 when column drive levels of said drive waveforms for pixels of one selected row change by more than a threshold level between said one selected row and a next selected row to provide a column drive row change signal; and inhibiting said touch sensing responsive to said column drive row change signal indicating a greater than said threshold level change of said column drive levels from said one selected row to said next selected row during said sensing interval.
Owner:FLEHKSENEHBL LTD
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