Preferably, the voltages V1 and V2, the mean capacitance value Cfavg for each pixel group, capacitance Cfi for each sensing electrode, capacitance C formed between the coupling electrode and the sensing electrode, and a voltage V0′ for {HEAD ~ each sensing electrode} at {TAIL ~ the third step} are represented by the following equation: 
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Preferably , the voltages V1 and V2 , the mean capacitance value Cfavg for each pixel group , capacitance Cfi for each sensing electrode , capacitance C formed between the coupling electrode and the sensing electrode , and a voltage V0′ for { HEAD ~ each sensing electrode } at { TAIL ~ the third step } are represented by the following equation :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH