Input device, contact position detection method, and display device provided with input device
First Claim
1. An input device comprising:
- a touch panel that includes M (where M is a natural number of 5 or more) driving electrodes, and a plurality of detection electrodes forming capacitances between the respective driving electrodes, in which the M driving electrodes and the plurality of detection electrodes are perpendicular to each other and are disposed in a matrix;
a driving circuit that is connected to the M driving electrodes, sequentially drives the M driving electrodes for each predetermined selection period in the unit of a driving electrode group including continuous Nd (where 3≦
Nd<
M) driving electrodes, makes a driving electrode which is located further toward a rear side in a direction in which the M driving electrodes are arranged than a driving electrode located at a center of a driving electrode group which is driven in one selection period of continuous selection periods overlap a driving electrode which is located further toward a front side in the direction in which the M driving electrodes are arranged than a driving electrode located at a center of a driving electrode group which is driven in the other selection period, and reduces a voltage of a driving signal to be applied to a driving electrode as the driving electrode forming each driving electrode group is located at a position more distant from the center of the driving electrode group;
a plurality of detection circuits that are respectively connected to the plurality of detection electrodes and acquire detection voltages which respectively correspond to potentials of the plurality of detection electrodes; and
a control unit that is connected to the driving circuit and the plurality of detection circuits,wherein the control unit includes a coordinate acquisition portion that acquires a coordinate of a position in which an object is in contact with the touch panel in the direction in which the M driving electrodes are arranged, based on a detection voltage acquired by the detection circuit in one of the continuous selection periods and a detection voltage acquired by the detection circuit in the other selection period.
1 Assignment
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Accused Products
Abstract
Detection accuracy is improved without reducing a driving frequency and an S/N ratio.
Driving electrodes (DL(j−2) and DL(j−1)) of a driving electrode group (GDL(i)) overlap a driving electrode group GDL(i−1), and driving electrodes (DL(j+1) and DL(j+2)) thereof overlap a driving electrode group GDL(i+1). A first changeover terminal of a changeover switch (SW(i)) is connected to a wire to which a burst clock signal (BCK) is given, and a ground potential is given to a second changeover terminal thereof. A common terminal of the changeover switch (SW(i)) is connected to a driving electrode (DL(j)) located at a center of the driving electrode group (GDL(i)), is connected to the driving electrodes (DL(j−1) to DL(j−3)), respectively, via one to three resistive elements (Rd), and is connected to the driving electrodes (DL(j+1) to DL(j+3)), respectively, via one to three resistive elements (Rd).
5 Citations
14 Claims
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1. An input device comprising:
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a touch panel that includes M (where M is a natural number of 5 or more) driving electrodes, and a plurality of detection electrodes forming capacitances between the respective driving electrodes, in which the M driving electrodes and the plurality of detection electrodes are perpendicular to each other and are disposed in a matrix; a driving circuit that is connected to the M driving electrodes, sequentially drives the M driving electrodes for each predetermined selection period in the unit of a driving electrode group including continuous Nd (where 3≦
Nd<
M) driving electrodes, makes a driving electrode which is located further toward a rear side in a direction in which the M driving electrodes are arranged than a driving electrode located at a center of a driving electrode group which is driven in one selection period of continuous selection periods overlap a driving electrode which is located further toward a front side in the direction in which the M driving electrodes are arranged than a driving electrode located at a center of a driving electrode group which is driven in the other selection period, and reduces a voltage of a driving signal to be applied to a driving electrode as the driving electrode forming each driving electrode group is located at a position more distant from the center of the driving electrode group;a plurality of detection circuits that are respectively connected to the plurality of detection electrodes and acquire detection voltages which respectively correspond to potentials of the plurality of detection electrodes; and a control unit that is connected to the driving circuit and the plurality of detection circuits, wherein the control unit includes a coordinate acquisition portion that acquires a coordinate of a position in which an object is in contact with the touch panel in the direction in which the M driving electrodes are arranged, based on a detection voltage acquired by the detection circuit in one of the continuous selection periods and a detection voltage acquired by the detection circuit in the other selection period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A contact position detection method of detecting a position in which an object is in contact with a touch panel that includes M (where M is a natural number of 5 or more) driving electrodes, and a plurality of detection electrodes forming capacitances between the respective driving electrodes, in which the M driving electrodes and the plurality of detection electrodes are perpendicular to each other and are disposed in a matrix, the method comprising:
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a step of sequentially driving the M driving electrodes for each predetermined selection period in the unit of a driving electrode group including continuous Nd (where 3≦
Nd<
M) driving electrodes, making a driving electrode which is located further toward a rear side in a direction in which the M driving electrodes are arranged than a driving electrode located at a center of a driving electrode group which is driven in one selection period of continuous selection periods overlap a driving electrode which is located further toward a front side in the direction in which the M driving electrodes are arranged than a driving electrode located at a center of a driving electrode group which is driven in the other selection period, and reducing a voltage of a driving signal to be applied to a driving electrode as the driving electrode forming each driving electrode group is located at a position more distant from the center of the driving electrode group;a step of acquiring detection voltages which respectively correspond to potentials of the plurality of detection electrodes; and a step of acquiring a coordinate of a position in which the object is in contact with the touch panel in the direction in which the M driving electrodes are arranged, based on a detection voltage acquired in the step of acquiring detection voltages in one of the continuous selection periods and a detection voltage acquired in the step of acquiring detection voltages in the other selection period.
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14. A display device comprising:
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a display unit that displays an image; and an input device, wherein the input device includes a touch panel that has M (where M is a natural number of 5 or more) driving electrodes, and a plurality of detection electrodes forming capacitances between the respective driving electrodes, in which the M driving electrodes and the plurality of detection electrodes are perpendicular to each other and are disposed in a matrix; a driving circuit that is connected to the M driving electrodes, sequentially drives the M driving electrodes for each predetermined selection period in the unit of a driving electrode group including continuous Nd (where 3≦
Nd<
M) driving electrodes, makes a driving electrode which is located further toward a rear side in a direction in which the M driving electrodes are arranged than a driving electrode located at a center of a driving electrode group which is driven in one selection period of continuous selection periods overlap a driving electrode which is located further toward a front side in the direction in which the M driving electrodes are arranged than a driving electrode located at a center of a driving electrode group which is driven in the other selection period, and reduces a voltage of a driving signal to be applied to a driving electrode as the driving electrode forming each driving electrode group is located at a position more distant from the center of the driving electrode group;a plurality of detection circuits that are respectively connected to the plurality of detection electrodes and acquire detection voltages which respectively correspond to potentials of the plurality of detection electrodes; and a control unit that is connected to the driving circuit and the plurality of detection circuits, wherein the control unit includes a coordinate acquisition portion that acquires a coordinate of a position in which an object is in contact with the touch panel in the direction in which the M driving electrodes are arranged, based on a detection voltage acquired by the detection circuit in one of the continuous selection periods and a detection voltage acquired by the detection circuit in the other selection period.
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Specification