Patent ID: 9658724
Date: 2017-05-23
CPC Classifications: G06F

Claim:
1. A touch sensing circuit, applied to a touch panel to generate a touch sensing result, the touch panel comprising a plurality of capacitors, the touch sensing circuit comprising: a sensed value analyzing circuit, configured to charge the capacitors in a first time interval and to discharge the capacitor in a second time interval, and to generate a sensing signal according to capacitance information of the capacitors; and a determining unit, configured to generate the touch sensing result according to the sensing signal; wherein, a length of one of the first time interval and the second time interval changes according to a control signal, an interference signal detecting circuit, coupled to the sensed value analyzing circuit, configured to detect an interference signal of the touch panel to generate an interference signal detection result; a control signal generating unit, configured to generate the control signal according to the interference signal detection result; and wherein the control signal generating unit determines the length of one of the first time interval and the second time interval according to a first predetermined period and the interference signal detection result: when the interference signal detection result after reaching the first predetermined period indicates a presence of interference, the control signal generating unit extends the length of the first time interval by a second predetermined period via the control signal, wherein a time point that the first predetermined period is reached is not later than an end of an unextended first time interval.