Touch input detection using complex gradients
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United States of America Patent
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Jan 31, 2023
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N/A
app pub date -
May 31, 2022
filing date -
May 31, 2022
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Abstract
A method for touch detection includes, at a touch-sensitive device having a plurality of touch-sensing electrodes, driving a first subset of the plurality of touch-sensing electrodes with a drive signal having a first phase. A second subset of the plurality of touch-sensing electrodes are driven with a drive signal having a second phase, different from the first phase. Output signals for each of the plurality of touch-sensing electrodes are measured. For each touch-sensing electrode of the plurality of touch-sensing electrodes, a complex gradient is determined between the measured output signal for the touch-sensing electrode and the measured output signal for a neighboring touch-sensing electrode, the neighboring touch-sensing electrode driven with a different phase of a drive signal from the touch-sensing electrode. A location of a touch input is identified based at least in part on magnitudes of the determined complex gradients.
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