http://www.w3.org/ns/prov#value | - particular scanning electrode,wherein the scanning electrodes are provided in a number N, andsaid former voltage signal and said latter voltage signal are set to have pulse durations .DELTA.T.sub.1 (sec) and .DELTA.T.sub.2 (sec), respectively, satisfying: .DELTA.T.sub.1 +.DELTA.T.sub.21 >T.sub.1, wherein T.sub.1 is a time given as oneframe scanning period (sec)/N.13.
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