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Driving electrodes with different phase signals

  • US 9,041,682 B2
  • Filed: 10/23/2009
  • Issued: 05/26/2015
  • Est. Priority Date: 10/23/2009
  • Status: Expired due to Fees
First Claim
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1. A controller comprising:

  • drive circuitry operable to;

    drive, over a time period, one target drive electrode of a touch sensitive device with a series of pulses having a predetermined phase, the series of pulses having the predetermined phase being a series of consecutive pulses having the predetermined phase; and

    drive, over the time period, each of at least first and second drive electrodes of the touch sensitive device with a corresponding series of out-of-phase pulses, the first and second drive electrodes each being directly adjacent to the target drive electrode, one or more of the first and second drive electrodes being driven using fractional bursts of out-of-phase pulses such that at least one of the first and second drive electrodes is not driven with a corresponding out-of-phase pulse for at least one pulse of the series of pulses; and

    sense circuitry operable to receive signal transferred to sense electrodes from the drive electrodes of the touch sensitive device, wherein the received signal is responsive to one or more touches on the touch sensitive device.

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