a third step, in which the second sensing electrode switches are turned off to prevent the pixels contained in each pixel group from being electrically interconnected, and a voltage of {HEAD ~ V1} is applied to {TAIL ~ the second voltage source}, such that changed capacitance for each sensing electrode is calculated, 
a third step , in which the second sensing electrode switches are turned off to prevent the pixels contained in each pixel group from being electrically interconnected , and a voltage of { HEAD ~ V1 } is applied to { TAIL ~ the second voltage source } , such that changed capacitance for each sensing electrode is calculated ,
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 OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH