Touch panel device detecting water

摘要

A touch panel device includes: an electrostatic capacitance touch panel of mutual capacitance type which includes transmission-side electrodes and reception-side electrodes; a detecting unit which detects a contact with the electrostatic touch panel and outputs contact information; and a detection signal variation calculating unit which calculates and outputs detection signal variations of the transmission-side electrodes and the reception-side electrodes based on the contact information. The touch panel device further includes: a variation distribution calculating unit which calculates and outputs a variation distribution of the detection signals based on the detection signal variations; and a determining unit which determines that an object contacting the electrostatic touch panel is a drop of water when a peak value of the variation distribution of the detection signals is a predetermined negative threshold or less.

主权项

1. A touch panel device comprising:
an electrostatic capacitance touch panel of mutual capacitance type which comprises a plurality of transmission-side electrodes and a plurality of reception-side electrodes; a detecting unit which detects a contact with the electrostatic touch panel and outputs contact information; a detection signal variation calculating unit which calculates and outputs detection signal variations of the plurality of transmission-side electrodes and the plurality of reception-side electrodes based on the contact information; a variation distribution calculating unit which calculates and outputs a variation distribution of the detection signals based on the detection signal variations; and a determining unit which determines that an object contacting the electrostatic touch panel is a drop of water when a peak value of the variation distribution of the detection signals is a predetermined negative threshold or less and when a peak value of the variation distribution of the detection signals in a peripheral area which is around an area on the electrostatic touch panel where the peak value of the variation distribution of the detection signals is the predetermined negative threshold or less is a predetermined positive threshold or more.