Touch-panel device

A touch panel device comprising:

• a touch panel including
• a plurality of first electrodes arranged apart from one another in a first direction and extending in a second direction different from the first direction,
• an insulation layer, and
• a plurality of second electrodes arranged apart from one another in a third direction and extending in a fourth direction different from the second direction and the third direction, the plurality of second electrodes facing the plurality of first electrodes across the insulation layer and apart from the plurality of first electrodes at a plurality of crossing points;
• an alternating-current (AC) signal source operable to input an AC signal into the plurality of first electrodes;
• an inductive element electrically connected in series between the AC signal source and each of the plurality of first electrodes;
• and
• a detection circuit operable to detect a change of a capacitance at each of the plurality of crossing points between respective one of the plurality of first electrodes and respective one of the plurality of second electrodes upon a touch of an object on the touch panel, based on a change of signals output from the plurality of second electrodes.

A touch panel device comprising:

• a touch panel including a first electrode and a second electrode;
• an alternating-current (AC) signal source operable to input an AC signal into the first electrode and the second electrode;
• an inductive element electrically connected in series between the AC signal source and the first electrode;
• and
• a detection circuit operable to detect a change of a capacitance between the first electrode and a ground or a change of a capacitance between the second electrode and the ground upon a touch of an object on the touch panel based on a change of signals output from the first electrode and the second electrode.

A touch panel device comprising:

• a touch panel including
• a plurality of first electrodes arranged apart from one another in a first direction and extending in a second direction different from the first direction,
• an insulation layer, and
• a plurality of second electrodes arranged apart from one another in a third direction and extending in a fourth direction different from the second direction and the third direction, the plurality of second electrodes facing the plurality of first electrodes across the insulation layer at plurality of crossing points;
• an alternating-current (AC) signal source operable to input an AC signal into the plurality of first electrodes and the plurality of second electrodes;
• an inductive element electrically connected in series between the AC signal source and each of the plurality of first electrodes or between the AC signal source and each of the plurality of second electrodes;
• and
• a detection circuit operable to detect a change of a capacitance between a ground and each of the plurality of first electrodes or a change of a capacitance between the ground and each of the plurality of second electrodes upon a touch of an object on the touch panel, based on a change of signals output from the plurality of first electrodes and the plurality of second electrodes.