| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a touch input device having good sensitivity to various contact objects. <P>SOLUTION: A peak detector section 16 receives electrostatic capacitance data C<SB POS="POST">i,j</SB>, which is generated every frame and represents electrostatic capacitance of each of a plurality of sensor electrodes SE, and determines a peak capacitance value data C<SB POS="POST">PEAK</SB>corresponding to the largest electrostatic capacitance. An arithmetic processing section 18 compares the peak capacitance value data C<SB POS="POST">PEAK</SB>generated every frame to a threshold value TH to determine presence of a touch by a user. When the peak capacitance value data C<SB POS="POST">PEAK</SB>that is smaller than the current threshold value TH and greater than a predetermined minimum value TH<SB POS="POST">LOW</SB>is detected in a predetermined number N of consecutive frames, a threshold value controller 20 revises the threshold value TH to an average value AVE of the peak capacitance value data C<SB POS="POST">PEAK</SB>, acquired over the predetermined number N of frames, multiplied by a predetermined coefficient K (0<K<1). <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
