Patent ID: 8866792

Claim:
A method of scanning a touch panel, comprising: dividing the touch panel into a plurality of regions. comprising: dividing mutual capacitance formed by driving electrodes and sensing electrodes of the touch panel into a plurality of groups with each group having a plurality of mutual capacitance located in the corresponding region; scanning the different regions by using excitation signals of different frequency respectively; obtaining candidate mutual capacitance whose capacitance changes after being scanned by excitation signals, comprising: obtaining a first current voltage of each mutual capacitance: comparing the first current voltage with a first reference voltage; and obtaining the candidate mutual capacitance whose first current voltage exceed the first reference voltage by a first threshold value; and scanning the candidate mutual capacitance by using excitation signals of low frequency to obtain touched mutual capacitance, comprising: obtaining a second current voltage of each candidate mutual capacitance; comparing the second current voltage of each candidate mutual capacitance with a corresponding second reference voltage; and obtaining touched mutual capacitance whose second current voltage exceed the corresponding second reference voltage by a second threshold value.