Patent ID: 8723533

Claim:
A method of detecting pressure on a touch sensing element, the touch sensing element comprising a first film and a second film each comprising two electrodes, the method comprising: providing a first potential difference to the two electrodes of the first film; charging a capacitor with a division voltage of the first potential difference; sampling a charged voltage of the capacitor to obtain a plurality of first voltage values and calculating a first voltage variation according to the plurality of first voltage values; comparing the first voltage variation with a threshold value; post-processing at least one of the first voltage values when the first voltage variation is smaller than the threshold value; identifying whether the first voltage values reach a stable state; ending pressure detecting when the first voltage values do not reach the stable state; when the first voltage values reach the stable state, the method further comprising: providing a second potential difference to the two electrodes of the second film; charging the capacitor with a division voltage of the second potential difference; sampling a charged voltage of the capacitor to obtain a plurality of second voltage values; identifying whether the second voltage values reach the stable state; ending pressure detecting when the second voltage values do not reach the stable state; and post-processing at least one of the first voltage values and at least one of the second voltage values when the second voltage values reach the stable state.