Patent ID: 8194050
Filing Date: 2012-06-05
Classification: G06F

Abstract:
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.