Touch detection method of a touch detection device for obtaining a calibrated variation for determining whether a touch event has been triggered

A touch detection method of a touch detection device, the touch detection device comprising a processing unit, a first capacitor and a second capacitor, a first terminal of the first capacitor being coupled to an output terminal of the processing unit, a second terminal of the first capacitor being coupled to an input terminal of the processing unit and a first terminal of the second capacitor, a second terminal of the second capacitor being coupled to a ground terminal, the touch detection method comprising:

• outputting a first signal via the output terminal of the processing unit;
• receiving a second signal via the input terminal of the processing unit, wherein a voltage level of the second signal corresponds to a voltage level of the first signal, a first capacitance of the first capacitor and a second capacitance of the second capacitor;
• calibrating a variation of the voltage level of the second signal by using a calibration parameter to obtain a calibrated variation;
• and
• determining a touch event has been triggered if the calibrated variation is greater than a threshold.