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US 9,001,080 B2Granted
Touch-panel device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsMotoyuki Okayama, Hidenori Kitamura, Susumu Fukushima
Life of this patent
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Abstract
A touch panel device includes a touch panel including first and second electrodes, an alternating-current (AC) signal source operable to input an AC signal into the first 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 the second electrode upon a touch of an object on the touch panel, based on a change of a signal output from the second electrode. This touch panel device can enhance detection sensitivity with a simple configuration.
Claims95
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 configured 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;
- a detection circuit configured 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 first electrode switch configured to change a connection status of connecting and disconnecting between the inductive element and each of the plurality of first electrodes;
- a second electrode switch configured to change a connection status of connecting and disconnecting between the detection circuit and each of the plurality of second electrodes;
- a control circuit configured to control the first electrode switch and the second electrode switch;
- and
- an image display element facing the touch panel,
- wherein the image display element is configured to generate a larger noise during a noise period larger than during a further period other than the noise period, and
- wherein the control circuit is configured to control the first electrode switch to:
- connect, to a ground during the noise period, a first electrode out of the plurality of first electrodes which is disconnected from the AC signal source, and
- disconnect, from the ground during at least a part of the further period, the first electrode which is disconnected from the AC signal source.
13 more elements
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 configured 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;
- a detection circuit configured 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 first electrode switch configured to change a connection status of connecting and disconnecting between the inductive element and each of the plurality of first electrodes;
- a second electrode switch configured to change a connection status of connecting and disconnecting between the detection circuit and each of the plurality of second electrodes;
- a control circuit configured to control the first electrode switch and the second electrode switch;
- and
- an image display element facing the touch panel,
- wherein the image display element is configured to generate a larger noise during a noise period than during a further period other than the noise period, and
- wherein the control circuit is configured to control the second electrode switch to:
- connect, to a ground during the noise period, a second electrode out of the plurality of second electrodes which is disconnected from the detection circuit, and
- disconnect, from the ground during at least a part of the further period, the second electrode out of the plurality of second electrodes which is disconnected from the detection circuit.
13 more elements
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 configured 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 configured 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,
- wherein a resonance frequency of each of the plurality of second electrodes is different from a frequency of the AC signal.
7 more elements
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 configured 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;
- a detection circuit configured 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;
- a first electrode switch configured to changes a connection status of connecting and disconnecting between the inductive element and each of the plurality of first electrodes;
- a second electrode switch configured to change a connection status of connecting and disconnecting the detection circuit and each of the plurality of second electrodes;
- a control circuit configured to control the first electrode switch and the second electrode switch;
- and
- an image display element facing the touch panel,
- wherein the image display element is configured to generate a larger noise during a noise period than during a further period other than the noise period, and
- wherein the control circuit is configured to control the first electrode switch to:
- connect, to a ground during the noise period, a first electrode out of the plurality of first electrodes which is disconnected from the AC signal source, and
- disconnect, from the ground during at least a part of the further period, the first electrode out of the plurality of first electrodes which is disconnected from the AC signal source.
13 more elements
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 configured 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;
- a detection circuit configured 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;
- a first electrode switch configured to changes a connection status of connecting and disconnecting between the inductive element and each of the plurality of first electrodes;
- a second electrode switch configured to change a connection status of connecting and disconnecting the detection circuit and each of the plurality of second electrodes;
- a control circuit configured to control the first electrode switch and the second electrode switch;
- and
- an image display element facing the touch panel,
- wherein the image display element is configured to generate a larger noise during a noise period than during a further period other than the noise period, and
- wherein the control circuit is configured to control the second electrode switch to:
- connect, to a ground during the noise period, a second electrode out of the plurality of second electrodes which is disconnected from the detection circuit;
- and
- disconnect, from the ground during at least a part of the further period, the second electrode out of the plurality of second electrodes which is disconnected from the detection circuit.
14 more elements
Dependencies are inferred from the claim text.