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SENSING CIRCUIT DISCHARGE CONTROL METHOD AND DEVICE FOR TOUCH PANEL

  • US 20100073324A1
  • Filed: 09/16/2009
  • Published: 03/25/2010
  • Est. Priority Date: 09/19/2008
  • Status: Active Grant
First Claim
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1. A sensing circuit discharge control method, the sensing circuit comprising a sensing electrode and a discharging unit, the sensing electrode having a capacitance when no touch event occurs, while the capacitance increasing when a touch event occurs, the discharging unit having a first current source and a second current source, said method comprising:

  • providing a clock having a clock period;

    setting a current level for the first current source;

    setting a value P, a discharging duration of the first current source being defined as P times the clock period;

    charging the sensing electrode;

    discharging the sensing electrode by the first current source with the set current level and discharging duration;

    discharging the sensing electrode by the second current source until discharge of the sensing electrode is completed;

    determining whether the discharge of the sensing electrode is completed within a predetermined duration; and

    adjusting the value P to adjust the discharging duration of the first current source if it is determined that the discharge of the sensing electrode is failed to be completed within the predetermined duration.

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