Coordinate input device and display device including the same

摘要

A coordinate input device includes: a coordinate input unit 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 detection circuit that detects a signal of the first and/or second detection electrode; a selection circuit 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; a detection circuit for detecting a signal of the selected reference electrode; an input coordinate computing circuit for correcting a detection result of the detection circuit on the basis of the detected capacitance of the reference electrode and for calculating an input coordinate from the corrected detection result.

主权项

1. A coordinate input device comprising:
a plurality of first detection electrodes disposed in parallel to each other, a plurality of second detection electrodes intersecting the first detection electrodes; an electrode drive circuit configured to apply a drive signal to one or more of the first detection electrodes; and a detection circuit configured to detect a signal of the second detection electrode generated by the drive signal, wherein the electrode drive circuit is configured to select one or more of the first detection electrodes to which the drive signal is not applied as a reference electrode; wherein the detection circuit is configured to detect a signal of the selected reference electrode as a noise signal, and further comprising an input coordinate computing circuit configured to correct a detection result of the detection circuit on the basis of the detected noise signal of the reference electrode, and to calculate an input coordinate from the corrected detection result.