Preferably, the voltages V1 and V2, the mean capacitance value {HEAD ~ Cfavg} for {TAIL ~ 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 each sensing electrode at the third step are represented by the following equation: 
for
Preferably , the voltages V1 and V2 , the mean capacitance value { HEAD ~ Cfavg } for { TAIL ~ 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 each sensing electrode at the third step are represented by the following equation :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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