| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique which improves accuracy of detecting capacity by reducing random noise mixed from a display panel. <P>SOLUTION: A coordinate input device includes: a coordinate input part having a plurality of first detection electrodes and a plurality of second detection electrodes; an electrode drive circuit that applies a drive signal to one or more of the detection electrodes; a capacitance detection circuit that detects a capacitance of the first and/or second detection electrodes; and an input coordinate computing circuit that calculates an input coordinate from the capacitance detection result of the capacitance detection circuit. The coordinate input device includes: means for selecting one or more of the detection electrodes to which the drive signal is not applied from among the detection electrodes which are disposed in parallel to the detection electrodes to which the drive signal is applied, as a reference electrode; means for detecting the capacitance of the selected reference electrode; and means for correcting a capacitance detection result of the capacitance detection circuit on the basis of the detected capacitance of the reference electrode, wherein the input coordinate computing circuit calculates the input coordinate from the corrected capacitance detection result. <P>COPYRIGHT: (C)2011,JPO&INPIT |
