Stylus hover and position communication protocol
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United States of America Patent
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May 18, 2021
Grant Date -
N/A
app pub date -
Sep 11, 2019
filing date -
Nov 4, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
An active stylus includes a stylus electrode, receive circuitry, and transmit circuitry. The stylus electrode is configured to capacitively couple with one or more electrodes of a capacitance-based touch sensor of a touch-sensitive device. The receive circuitry is operatively coupled to the stylus electrode and configured to receive a synchronization waveform from the touch-sensitive device. The transmit circuitry is operatively coupled to the stylus electrode and configured to, upon receiving the synchronization waveform, transmit stylus information to the touch-sensitive device according to a communication frame including a first set of sub-frames and a second set of sub-frames. The transmit circuitry is configured to transmit a first waveform during the first set, if the active stylus is hovering, transmit the first waveform during the second set, and if the active stylus is not hovering, transmit one or more additional waveforms during the second set.
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