WO2019093067A1

WO2019093067A1 - Touch sensor

Info

Publication number: WO2019093067A1
Application number: PCT/JP2018/038020
Authority: WO
Inventors: 到大谷
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2017-11-13
Filing date: 2018-10-12
Publication date: 2019-05-16
Also published as: JP2021015315A

Abstract

This touch sensor comprises: a view area through which visual information is transmitted and obtained; a plurality of sensor electrodes disposed within the view area; a plurality of guide wires respectively connected electrically to the plurality of sensor electrodes; a plurality of wiring units respectively connected electrically to the plurality of guide wires; and a ground electrode which is disposed outside of the view area and to which a ground potential is applied. The touch sensor can improve sensitivity and positional precision of sensing.

Description

Touch sensor

The present invention relates to a touch sensor.

Patent Document 1 discloses a touch sensor provided with a conductive film having a view area (sensor area) corresponding to a display screen of a display panel. The conductive film has a base, a plurality of sensor electrodes formed on the main surface of the base, and a plurality of lead-out lines formed on the main surface of the base. The plurality of sensor electrodes are disposed in the view area and are spaced apart in the left-right direction orthogonal to the up-down direction of the view area. The plurality of lead wires are disposed in the view area and extend linearly from the plurality of sensor electrodes.

In the above-described conventional touch sensor, each sensor electrode has a first electrode and a plurality of second electrodes formed to face each other on the main surface of the base. In addition, all of the lead wirings extend in the up and down direction from the respective second electrodes of the sensor electrodes toward the lower side of the view area. The plurality of lead-out lines are disposed between the sensor electrodes adjacent to each other among the plurality of sensor electrodes, and are spaced apart in the left-right direction.

In the above-mentioned conventional touch sensor, the position accuracy and sensitivity of sensing by a sensor electrode may fall.

WO 2015/079816

The touch sensor includes a view area obtained by transmitting visual information, a plurality of sensor electrodes disposed in the view area, a plurality of lead-out lines electrically connected to the plurality of sensor electrodes, and a plurality of lead wires. A plurality of wiring portions electrically connected to the lead-out wiring, and a ground electrode disposed outside the view area to which a ground potential is applied.

This touch sensor can improve the position accuracy and sensitivity of sensing.

FIG. 1 is a perspective view of the touch sensor according to the first embodiment. FIG. 2A is a plan view showing a substrate, electrodes and lead wirings of the touch sensor according to the first embodiment. FIG. 2B is an enlarged view of the touch sensor shown in FIG. 2A. FIG. 3 is a partially enlarged view showing a portion III of the touch sensor shown in FIG. 2A. FIG. 4 is a partial enlarged view showing a portion IV of the touch sensor shown in FIG. 2A. FIG. 5 is a partially enlarged view showing a portion V of the touch sensor shown in FIG. 2A. FIG. 6 is a plan view of the touch sensor according to the second embodiment. FIG. 7 is a partial plan view showing a substrate, electrodes and lead wirings of a touch sensor according to another embodiment.

Hereinafter, each embodiment of the present invention will be described in detail based on the drawings. The following description of each embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its application.

First Embodiment
FIG. 1 is a perspective view showing the entire touch sensor 1 according to the first embodiment. The touch sensor 1 is a sensor-type input device capable of touch operation. The touch sensor 1 is, for example, various devices in which a display device such as a liquid crystal display or an organic EL display is incorporated (for example, an in-vehicle device such as a car navigation, a display device of a personal computer, a mobile phone, a portable information terminal, a portable game machine, It is used as an input device for copying machines, ticket vending machines, automatic teller machines, clocks, and the like.

In the following description, the positional relationship in the touch sensor 1 and each component thereof is specified based on the vertical direction Dud shown in each drawing and the horizontal direction Dhm intersecting the vertical direction Dud. In the first embodiment, the horizontal direction Dhm is perpendicular to the vertical direction Dud. However, such positional relationship is irrelevant to the actual direction in the touch sensor 1 or the device in which the touch sensor 1 is incorporated.

(Cover member)
As shown in FIG. 1, the touch sensor 1 includes a cover member 2 having light transparency. The cover member 2 is made of a cover glass or a cover lens made of plastic. The cover member 2 has, for example, a rectangular plate shape.

(View area)
At the outer peripheral position of the cover member 2, a window frame portion 3 having a substantially frame shape and a dark color such as black is formed by printing or the like. An internal rectangular area surrounded by the window frame portion 3 is provided as a translucent view area 4. The view area 4 is an area obtained by transmitting visual information in the touch sensor 1. In the present embodiment, the view area 4 is configured such that the short side is along the vertical direction Dud and the long side is along the horizontal direction Dhm. Further, the surface of the cover member 2 corresponding to the view area 4 is configured as an operation surface with which the user's finger or the like comes in contact with the touch operation.

(Flexible wiring board)
The touch sensor 1 includes a flexible wiring board 5. The flexible wiring board 5 is configured so as to be flexible and not change its electrical characteristics even in a deformed state. The flexible wiring board 5 is made of, for example, a flexible insulating film such as polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or the like.

(substrate)
FIG. 2A is a plan view of the touch sensor 1. As shown in FIG. 2A, the touch sensor 1 includes a substrate 7. The substrate 7 is made of, for example, a light transmitting resin material such as polycarbonate, polyethylene terephthalate, polyether sulfone, PMMA (acrylic), polyarylate and the like. The substrate 7 has a substantially rectangular shape. The substrate 7 may include a resin layer, a resin film or the like to be laminated. The thickness of the substrate 7 is, for example, about 0.01 to 4 mm. The surface of the substrate 7 is a surface 7 a on which a sensor electrode 10 or the like described later is disposed. The surface 7 a may be the back surface of the substrate 7. An LCD display 501 (see FIG. 1) is disposed on the back side of the substrate 7. When the substrate 7 is made of a relatively hard material, the cover member 2 may not be provided. In such a case, the window frame portion 3 having a substantially frame shape is formed on the substrate 7 to provide the view area 4. The cover member 2 is laminated on the surface 7 a of the substrate 7. The tip of the flexible wiring board 5 is fixed to the lower side of the surface 7 a of the substrate 7 by, for example, an anisotropic conductive adhesive.

(Conductive part)
The touch sensor 1 includes a conductive portion. The conductive portion is disposed in the view area 4. FIG. 2B is an enlarged view of the touch sensor 1 shown in FIG. 2A, and particularly shows a conductive portion. As shown in FIG. 2B, the conductive portion is composed of conductive thin wires 503 arranged in a mesh pattern of net shape. As a material of the conductive fine wire 503, for example, a conductive metal such as copper or silver is desirable, but a conductive resin may be used. Alternatively, the other material of the conductive thin wire 503 is not limited to the above-described conductive metal or conductive resin, and may be a transparent material (transparent conductive film) having light transparency such as indium tin oxide or tin oxide. Alternatively, the conductive portion may be formed of a so-called solid transparent conductive film. The sensor electrode 10, the lead wiring 15, and the

ground electrodes

21 and 22 are configured by the conductive portion. The lead wiring 15 may be formed of a conductive portion in which the conductive thin wire 503 is arranged in a ladder shape.

(Sensor electrode)
The plurality of sensor electrodes 10 are configured as an electrostatic capacitance system capable of detecting a touch operation by the user's finger (detection target) in contact with the surface of the cover member 2 serving as the operation surface. The sensor electrode 10 is formed on the surface 7 a of the substrate 7 and extends along the vertical direction Dud of the view area 4. The plurality of sensor electrodes 10 are arranged at intervals in the left-right direction Dhm. The plurality of sensor electrodes 10 include sensor electrodes 10 n (n is an integer) disposed at an end of the right direction Dm from the sensor electrode 101 disposed at an end of the left direction Dh.

FIGS. 3, 4 and 5 are partial enlarged views showing a portion III, a portion IV and a portion V of the touch sensor shown in FIG. 2A, respectively. As shown in FIGS. 2A to 5, the sensor electrode 10 includes a plurality of transmission electrodes 11 and a plurality of reception electrodes 12. In FIGS. 2A to 5, in order to emphasize and show the transmission electrode 11 and the reception electrode 12, the transmission electrode 11 and the reception electrode 12 are hatched with different dots. The wiring portion 18 is omitted in FIG. 5 for the sake of clarity.

The transmission electrode 11 is connected to a drive circuit 602 (see FIG. 1), and is configured to emit an electric field to the surroundings when a voltage is applied by the drive circuit 602. The transmission electrode 11 has a substantially comb shape in plan view. The shape of the transmission electrode 11 is not limited to the substantially comb shape, but may be various shapes. Specifically, the sensor electrode 101 has a transmitting electrode 111, and the transmitting electrode 111 is constituted by five independent electrodes 1111 to 1115 which are independent of each other. The independent electrodes 1111 to 1115 are arranged along the vertical direction Dud. The sensor electrode 102 has a transmitting electrode 112, and the transmitting electrode 112 is constituted by five independent electrodes 1121 to 1125 which are separated from each other. The independent electrodes 1121 to 1125 are arranged along the vertical direction Dud. The sensor electrode 103 has a transmitting electrode 113 consisting of five independent electrodes separated from one another, which are similarly arranged along the vertical direction Dud. The sensor electrode 10n also has a transmitting electrode 11n, and the transmitting electrode 11n is configured of five independent electrodes 11n1 to 11n5 which are separated from each other. The independent electrodes 11n1 to 11n5 are arranged along the vertical direction Dud.

The independent electrode 1111, the independent electrode 1121,..., The independent electrode 11n1 are arranged in a row LL1 along the left-right direction Dhm and arranged at the upper end position of the view area 4. Hereinafter, the independent electrode 1111, the independent electrode 1121,..., The independent electrode 11n1 will be described as the first row of the plurality of transmission electrodes 11. In the first row downward direction Dd of each transmission electrode 11, an independent electrode 1112, an independent electrode 1122,..., An independent electrode 11n2 are arranged in a row LL2 along the left-right direction Dhm. The independent electrode 1112, the independent electrode 1122,..., And the independent electrode 11 n2 form a second row of transmission electrodes 11 arranged immediately below the first row of transmission electrodes 11. Likewise, the independent electrode 1113, the independent electrode 1123,..., The independent electrode 11n3 are arranged in the row LL3 along the left-right direction Dhm. The third row of the plurality of transmission electrodes 11 is formed immediately below the second row of the plurality of transmission electrodes 11 by the independent electrodes 1113, the independent electrodes 1123,..., And the independent electrodes 11n3. The independent electrode 1114, the independent electrode 1124,..., The independent electrode 11n4 are arranged in the line LL4 along the left-right direction Dhm. The independent electrode 1114, the independent electrode 1124,..., The independent electrode 11n4 form a fourth row of the plurality of transmission electrodes 11. The independent electrode 1115, the independent electrode 1125,..., The independent electrode 11n5 are arranged in the row LL5 along the left-right direction Dhm. The independent electrode 1115, the independent electrode 1125,..., The independent electrode 11n5 form the fifth column of the plurality of transmission electrodes 11. The fifth column of the plurality of transmission electrodes 11 is disposed at the lower end position of the view area 4.

The receiving electrode 12 is configured to receive an electric field radiated from each transmitting electrode 11 and detect it by the detection circuit 603 (see FIG. 1). The receiving electrode 12 has a substantially comb shape in a plan view, and faces each transmitting electrode 11 at an interval in the left-right direction Dhm. The plurality of transmission electrodes 11 and the plurality of reception electrodes 12 constitute a plurality of sensing nodes arranged along the vertical direction Dud. The shape of each receiving electrode 12 is not limited to the substantially comb shape, but may be various shapes.

Specifically, the sensor electrode 101 has a receiving electrode 121. The receiving electrode 121 faces the left side of the independent electrodes 1111 to 1115 in the left-right direction Dhm at a first interval. The sensor electrode 102 has a receiving electrode 122. The receiving electrode 122 is opposed to the independent electrodes 1121 to 1125 at the right side in the left-right direction Dhm with a first interval. The sensor electrode 10 n has a receiving electrode 12 n. The receiving electrodes 12 n face the independent electrodes 11 n 1 to 11 n 5 at the right side in the left-right direction Dhm with a first interval.

As shown in FIGS. 2A and 3, among the plurality of sensor electrodes 10, the sensor electrode 101 located on the leftmost side in the left-right direction Dhm has the receiving electrode 121 located near the end in the left-right direction Dhm in the view area 4. It is arranged as. The independent electrodes 1111 to 1115 of the sensor electrode 101 are disposed on the right side of the receiving electrode 121.

The sensor electrode 102 is disposed on the right side of the sensor electrode 101 with a second interval. That is, the independent electrodes 1121 to 1125 of the sensor electrode 102 are arranged at a second interval on the right side from the independent electrodes 1111 to 1115 of the sensor electrode 101, and the first intervals are further opened on the right side of the transmission electrodes 1121 to 1125. The receiving electrode 122 is disposed.

The sensor electrode 103 is disposed on the right side of the sensor electrode 102 with a third interval. That is, the reception electrode 123 of the sensor electrode 103 is disposed at a third interval on the right side from the reception electrode 122 of the sensor electrode 102, and the transmission electrode 113 is disposed at a first interval on the right of the reception electrode 123. It is done.

Among the plurality of sensor electrodes 10, the sensor electrode 10n located on the rightmost side in the left-right direction Dhm is disposed such that the receiving electrode 12n is located near the end in the left-right direction Dhm in the view area 4. The independent electrodes 11n1 to 11n5 of the sensor electrode 10n are disposed on the left side of the receiving electrode 12n.

As described above, the sensor electrode 101 and the sensor electrode 102 are disposed in the order of the receiving electrode 121, the transmitting electrode 111, the transmitting electrode 112, and the receiving electrode 122 from left to right. The transmission electrode 111 and the transmission electrode 112 are opposed to each other in the left-right direction Dhm. The receiving electrode 122 and the receiving electrode 123 face each other in the left-right direction Dhm.

Here, in the plurality of sensor electrodes 10, when the predetermined potential different from the ground potential is applied to the predetermined column in the plurality of transmission electrodes 11, the ground potential is applied to the other columns in the plurality of transmission electrodes 11 It is configured to be applied. That is, each receiving electrode 12 is configured to be able to receive only the electric field radiated from a predetermined row of the plurality of transmitting electrodes 11 to which a predetermined potential is applied.

(Put wiring)
The plurality of lead wirings 15 are electrically connected to the plurality of transmission electrodes 11 respectively. The plurality of lead wirings 15 include a plurality of lower wirings 16 and a plurality of upper wirings 17 which are divided into the upper direction Du and the lower direction Dd. The plurality of lower wirings 16 are located in the downward direction Dd of the plurality of upper wirings 17. The plurality of lower wirings 16 and the plurality of upper wirings 17 are disposed between the transmission electrode 111 and the transmission electrode 112. That is, the plurality of lower wirings 16 and the plurality of upper wirings 17 are disposed between the transmission electrodes 11 adjacent to each other without interposing the reception electrode 12 in the left-right direction Dhm. An area between the adjacent transmission electrodes 11 without the reception electrode 12 is a dead area of the view area 4. The dead area is an area where the sensor electrode 10 is not disposed and detection of a touch operation is impossible.

As shown in FIGS. 2A and 3, the lower wirings 16 extend from the transmission electrodes 11 toward the lower side of the view area 4 in the vertical direction Dud, that is, the lower direction Dd. The plurality of lower wirings 16 are arranged at intervals in the left-right direction Dhm between the transmission electrodes 11 adjacent to each other. Further, in the sensor electrodes 10 adjacent to each other, the lower wirings 16 located on the uppermost side among the plurality of lower wirings 16 are under the view area 4 in a state of being converged into one line between the transmission electrodes 11 adjacent to each other. It extends in the vertical direction Dud toward the side. That is, as shown in FIG. 2A, the lower wiring 16 between the independent electrode 1113 of the transmission electrode 111 and the independent electrode 1123 of the transmission electrode 112 is directed to the lower side of the view area 4 in a state of being converged into one line. And extend in the vertical direction Dud.

As shown in FIGS. 2A and 4, each upper wire 17 extends from the transmission electrode 11 to the upper side of the view area 4 in the vertical direction Dud, that is, in the upper direction Du. The plurality of upper wires 17 are arranged at intervals in the left-right direction Dhm between the transmission electrodes 11 adjacent to each other. Further, in the sensor electrodes 10 adjacent to each other, the upper wires 17 located on the lowermost side among the plurality of upper wires 17 are located on the upper side of the view area 4 in a state of being converged to one line between the adjacent transmission electrodes 11. It extends in the vertical direction Dud. That is, as shown in FIG. 2A, the upper wiring 17 between the independent electrode 1112 of the transmission electrode 111 and the independent electrode 1122 of the transmission electrode 112 converges in a single line and moves upward and downward of the view area 4 It extends in the direction Dud.

(Ground electrode)
As shown in FIGS. 2A to 5, on the surface 7 a of the substrate 7, a plurality of ground electrodes 21 to which a ground potential is applied and a plurality of ground electrodes 22 are provided. Each of the

ground electrodes

21 and 22 has a rectangular shape in plan view. The rectangular long side extends in the vertical direction Dud from the upper side to the lower side of the view area 4. In FIG. 2A to FIG. 5, in order to emphasize and show the

ground electrodes

21 and 22, the

ground electrodes

21 and 22 are hatched in a hatched shape.

The ground electrodes 21 are respectively provided with the plurality of wiring portions 18 connected to the plurality of upper wires 17 and the sensor electrodes 10 located on the outermost side in the left-right direction Dhm outside the left-right direction Dhm on the outer periphery of the view area 4. It is disposed between. The ground electrode 21 is disposed between the sensor electrode 10 located at the end in the left direction Dh of the plurality of sensor electrodes 10 and each of the plurality of wiring portions 18 connected to the plurality of upper wirings 17. Another ground electrode 21 is disposed between the sensor electrode 10 located at the end in the right direction Dm of the plurality of sensor electrodes 10 and each of the plurality of wiring portions 18 connected to the plurality of upper wirings 17 There is. Specifically, the ground electrode 21 faces the receiving electrode 121 of the sensor electrode 101 located at the end in the left direction Dh in the left-right direction Dhm, and the other ground electrode 21 is a sensor located at the end in the right direction Dm It opposes the receiving electrode 12n of the electrode 10n in the left-right direction Dhm.

The ground electrodes 22 are disposed between the sensor electrodes 10 adjacent to each other, and face the respective sensor electrodes 10 in the left-right direction Dhm. Specifically, the ground electrode 22 is disposed, for example, between the sensor electrode 102 and the sensor electrode 103, and is located between the receiving electrode 122 and the receiving electrode 123. In other words, the ground electrode 22 is at least disposed between the two reception electrodes 12 disposed opposite to each other without interposing the transmission electrode 11.

(Wiring section)
The touch sensor 1 includes a plurality of wiring portions 18 for electrically connecting to the drive circuit 602 and the detection circuit 603. The plurality of wiring portions 18 are disposed outside the view area 4 and are concentrated below the substrate 7. In addition, the plurality of wiring portions 18 are elongated in the extending direction, and are spaced apart from each other in the direction orthogonal to the extending direction. One ends of the plurality of wiring portions 18 are electrically connected to the reception electrode 12, the plurality of lower wirings 16, the plurality of upper wirings 17, the ground electrode 21, and the ground electrode 22. The other end of the wiring portion 18 is electrically connected to the flexible wiring board 5.

The plurality of wiring portions 18 a among the plurality of wiring portions 18 are respectively connected to the plurality of upper side wirings 17. The plurality of wiring portions 18 b among the plurality of wiring portions 18 are respectively connected to the plurality of lower wirings 16. The wiring portion 18 a connected to the upper wiring 17 is routed from the upper side of the outer periphery of the view area 4 to the lower side through the outside in the left-right direction Dhm. That is, the wiring portion 18 a connected to the upper side wiring 17 is drawn to the lower side of the view area 4 along the outer periphery of the view area 4.

[Operation and effect of the first embodiment]
In the conventional touch sensor disclosed in Patent Document 1, the plurality of lead-out lines are disposed between the sensor electrodes adjacent to each other and spaced apart in the left-right direction. That is, all the lead-out lines are arranged side by side in the lateral direction between the sensor electrodes. For this reason, the distance between the sensor electrodes is expanded, and it becomes difficult to narrow the area for arranging a plurality of lead-out lines, that is, the insensitive area where the sensor electrode is not arranged in the view area 4. As a result, in this touch sensor, positional accuracy and sensitivity of sensing by the sensor electrode may be reduced.

As described above, in the touch sensor 1 according to the first embodiment, the plurality of lead wirings 15 include the plurality of lower wirings 16 and the plurality of upper wirings 17 divided into the upper direction Du and the lower direction Dd. . Therefore, as compared with the conventional touch sensor in which the lead wiring is drawn only in the downward direction of the view area 4, it is possible to narrow the intervals of the plurality of sensor electrodes 10 in which the plurality of lead wirings 15 are located. That is, it is possible to narrow the dead area in the view area 4. As a result, as a result, the detectable region in the view area 4 is relatively expanded, so that the positional accuracy and sensitivity of sensing by the sensor electrode 10 are improved. On the other hand, by providing the plurality of upper wires 17, each of the plurality of wiring portions 18 connected to the plurality of upper wires 17 and the outermost in the left and right direction Dhm are outward in the left and right direction Dhm of the outer periphery of the view area 4. A parasitic capacitance is likely to occur between the sensor electrode 10 located. In the touch sensor 1 according to the first embodiment, the ground electrode 21 to which the ground potential is applied is disposed between each of the plurality of wiring portions 18 and the sensor electrode 10 positioned at the outermost side in the left-right direction Dhm. The generation of the parasitic capacitance can be appropriately suppressed. That is, as the ground electrode 21 suppresses the influence of the wiring portion 18 on the sensor electrode 10 located on the outermost side in the left-right direction Dhm, the positional accuracy and sensitivity of sensing by the sensor electrode 10 are maintained. Therefore, in the touch sensor 1 according to the first embodiment, the positional accuracy and sensitivity of sensing can be improved.

The ground electrode 21 extends in the vertical direction from the upper side to the lower side of the view area 4. As a result, the generation of the parasitic capacitance can be appropriately suppressed so that the vertical direction Dud is not biased at a position outside the lateral direction Dhm on the outer periphery of the view area 4.

Further, each of the sensor electrode 10, the lead wiring 15, and the ground electrode 21 is formed by arranging conductive thin wires 503 having conductivity in a mesh pattern of a net shape. Therefore, for example, when the user looks at the touch sensor 1 in an oblique direction, the presence of the lead wiring 15 and the ground electrode 21 can be prevented from being visually recognized by the user. Furthermore, the productivity of the touch sensor 1 can be improved by forming the sensor electrode 10, the lead wiring 15, and the ground electrode 21 in the same mesh pattern.

Further, in the sensor electrodes 10 adjacent to each other, for example, the transmission electrode 111 of the transmission electrode 11 and the transmission electrode 112 are disposed at an interval so as to face each other in the left-right direction Dhm. The plurality of lower wirings 16 and the plurality of upper wirings 17 are electrically connected to the transmission electrode 111 and the transmission electrode 112, respectively, and disposed between the transmission electrode 111 and the transmission electrode 112. Therefore, in the

sensor electrodes

101 and 102 adjacent to each other, the plurality of lower wirings 16 and the plurality of upper wirings 17 are spaced apart from the receiving electrode 121 and the receiving electrode 122 via the respective transmitting electrodes 11 in the left-right direction Dhm. Will be placed. Thereby, parasitic capacitance generated between each of the plurality of lower wirings 16 and each of the plurality of upper wirings 17 and the reception electrode 12 (the reception electrode 121, the reception electrode 122) can be suppressed. Furthermore, the plurality of lower wirings 16 and the plurality of upper wirings 17 can be collectively disposed efficiently between transmission electrodes 111 and transmission electrodes 112 adjacent to each other.

Further, the sensor electrode 10 located at the outermost side in the left-right direction Dhm is configured such that the receiving electrode 12 is disposed in the vicinity of the end in the left-right direction Dhm in the view area 4. For this reason, in the sensor electrode 10 located on the outermost side in the left-right direction Dhm, the plurality of lead-out lines 15 connected to the plurality of transmission electrodes 11 of the sensor electrode 10 are arranged near the end in the left-right direction Dhm in the view area 4 There is no need. Thereby, the frame portion of the touch sensor 1 can be narrowed to make the view area 4 relatively wide.

Further, the ground electrode 21 is opposed to the receiving electrode 12 of the sensor electrode 10 positioned at the outermost side in the left-right direction Dhm among the plurality of sensor electrodes 10. Therefore, the parasitic capacitance generated between each of the plurality of wiring portions 18 connected to the plurality of upper side wirings 17 and the reception electrode 12 in the lateral direction Dhm on the outer periphery of the view area 4 is determined by the ground electrode 21. It can be suppressed appropriately.

When a predetermined potential different from the ground potential is applied to the independent electrode 1111 of the transmission electrode 111 and the independent electrode 1121 of the transmission electrode 112 forming a line in the horizontal direction Dhm in the plurality of sensor electrodes 10 A ground potential is applied to the independent electrodes 1112 to 1115 and the independent electrodes 1122 to 1125. The predetermined potential is also applied to the independent electrode 1111 to which the predetermined potential is applied, and the lead wiring 15 connected to the independent electrode 1121. The routing wiring 15 to which a predetermined potential is applied is likely to be capacitively coupled to the receiving electrode 12. That is, there is a possibility that parasitic capacitance may occur to reduce the position accuracy of sensing. However, the above-mentioned capacitive coupling is reduced by applying a ground potential to the independent electrodes 1112 to 1115 and the independent electrodes 1122 to 1125 positioned between the lead wiring 15 and the receiving electrode 12, thereby suppressing parasitic capacitance. Can. Furthermore, in this embodiment, the driven drawing wiring 15 does not approach to the outside of the reception electrode 12 located at the outermost side in the left-right direction Dhm. Here, in the case where the ground electrode 21 is not disposed, the capacitance is reduced only by the node formed by the reception electrode 12 positioned at the outermost side, and the entire sensing variation occurs. However, in this embodiment, the ground electrode 21 is opposed to the receiving electrode 12 of the sensor electrode 10 located on the outermost side in the left-right direction Dhm. Then, due to the relationship between the lead wiring 15 to which the ground potential is applied and the ground electrode 21, the capacitance does not decrease only at the node formed by the receiving electrode 12 located at the outermost position in the left-right direction Dhm. Overall variation in sensing can be eliminated.

In addition, the lower wiring 16 electrically connected to the transmission electrodes 11 of the sensor electrodes 10 adjacent to each other and located at the uppermost position is located under the view area 4 in a state of being converged into one line between the transmission electrodes 11. It extends in the upward and downward direction Dud, that is, downward direction Dd. This makes it possible to reduce the overall number of lower wirings 16. As a result, the distance between the sensor electrodes 10 adjacent to each other, that is, the dead area in the view area 4 is narrowed, and the positional accuracy and sensitivity of sensing by the sensor electrodes 10 can be improved.

Further, the upper wire 17 electrically connected to the transmission electrodes 11 of the sensor electrodes 10 adjacent to each other and located at the lowermost side is directed to the upper side of the view area 4 in a state of being converged into one line between the transmission electrodes 11 And extends in the vertical direction Dud, that is, in the upper direction Du. This makes it possible to reduce the overall number of the plurality of upper wires 17. As a result, the distance between the sensor electrodes 10 adjacent to each other, that is, the dead area in the view area 4 is narrowed, and the positional accuracy and sensitivity of sensing by the sensor electrodes 10 can be improved.

In the

sensor electrodes

102 and 103 among the plurality of sensor electrodes 10, the receiving electrodes 12 face each other in the left-right direction Dhm. A ground electrode 22 to which a ground potential is applied is disposed between the receiving electrodes 12. As a result, in the

sensor electrodes

102 and 103 adjacent to each other, the transmission electrode 11 and the reception electrode 12 are mutually symmetrical with the ground electrode 22 as a symmetry axis. For this reason, it becomes possible to sense the change of the electrostatic capacitance at the time of touch operation so that bias does not arise in the left-right direction Dhm by the

sensor electrodes

102 and 103 adjacent to each other. As a result, the positional accuracy of sensing by the

sensor electrodes

102 and 103 can be improved.

Second Embodiment
FIG. 6 is a plan view of the touch sensor 1a according to the second embodiment. The same reference numerals as in the touch sensor 1 of the first embodiment shown in FIG. 2A denote the same parts in FIG. In the touch sensor 1a according to the second embodiment, the arrangement of the wiring portions 18 and the number of ground electrodes 21 are mainly different from those of the touch sensor 1 in the first embodiment. The other configuration of the touch sensor 1a according to the second embodiment is the same as the configuration of the touch sensor 1 according to the first embodiment. Therefore, in the following description, the same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals, and the detailed description thereof is omitted.

As shown in FIG. 6, in this embodiment, the flexible wiring board 5 is fixed to the right direction Dm of the surface 7 a of the substrate 7. Further, all the wiring portions 18 are integrated on the side of the substrate 7 in the right direction Dm. Then, one ends of the plurality of wiring portions 18 are electrically connected to the reception electrode 12, the plurality of lower wirings 16, the plurality of upper wirings 17, and the

ground electrodes

21 and 22, respectively. The other ends of the plurality of wiring portions 18 are electrically connected to the flexible wiring board 5 fixed on the right direction Dm side of the surface 7 a of the substrate 7. In the touch sensor 1 a according to the second embodiment, the wiring portion 18 connected to the receiving electrode 12 is pulled from the upper end portion of the receiving electrode 12 toward the right side of the substrate 7 in consideration of the upper and lower arrangement balance. It has been turned.

Further, in this embodiment, the plurality of wiring portions 18 connected to the plurality of upper side wires 17 are not located outside the sensor electrode 10 positioned on the most left side in the view area 4. Therefore, it is not necessary to provide the ground electrode 21 at this position. That is, in the second embodiment, the ground electrode 21 is located only on the outside of the sensor electrode 10 located on the rightmost side in the view area 4.

As described above, in the touch sensor 1a according to this embodiment, the same operation and effect as those of the first embodiment can be obtained even if the arrangement configuration of the wiring portion 18 is appropriately changed.

In this embodiment, the flexible wiring board 5 is fixed to the right direction Dm side of the surface 7 a of the substrate 7 and all the wiring portions 18 are integrated on the right side of the substrate 7. . That is, the flexible wiring board 5 may be fixed to the left direction Dh side of the surface 7 a of the substrate 7, and all the wiring portions 18 may be integrated on the left side of the substrate 7. In this embodiment, the ground electrode 21 is provided outside the sensor electrode 10 located at the end in the left direction Dh in the view area 4 among the plurality of sensor electrodes 10. In the second embodiment described above, only one ground electrode 21 is disposed. However, as in the first embodiment, the position in the view area 4 at the end in the horizontal direction Dhm is the same as in the first embodiment. The ground electrode 21 may be disposed in each of the left and right directions Dhm outside the sensor electrode 10.

Other Embodiments
In the touch sensor 1 or 1a according to each of the above embodiments, the plurality of lead wirings 15 include the plurality of lower wirings 16 and the plurality of upper wirings 17. It is not limited to this form. That is, in the touch sensor 1, 1 a, the plurality of lead wirings 15 have one or more lower wirings 16 and one or more upper wirings 17.

Further, in each of the above-described embodiments, in the sensor electrodes 10 adjacent to each other, the lower wires 16 located in the uppermost direction Du among the plurality of lower wires 16 are converged into a single line between the transmitting electrodes 11 facing each other. In the state, it extends in the vertical direction Dud, that is, the lower direction Dd toward the lower side of the view area 4. In the state where the upper wires 17 located in the lowermost direction Dd among the plurality of upper wires 17 are converged into one line between the transmitting electrodes 11 facing each other, the upper and lower direction Dud toward the upper side of the view area 4, that is, the upper direction It extends to Du, but is not limited to this form. For example, only the lowermost wiring 16 located at the uppermost side may be converged into one line. FIG. 7 is an enlarged view of the touch sensors 1 and 1a shown in FIG. 2A and FIG. Specifically, as shown in FIG. 7, only one of the plurality of lower interconnections 16 and the plurality of upper interconnections 17 (the lower interconnection 16 in FIG. 7) is divided into one line as described above. It may be focused. Even with such a configuration, it is possible to narrow the width of the insensitive section as in the above embodiments. Furthermore, in FIG. 7, regardless of the number of lower wirings 16 and the number of upper wirings 17, the bottom of the plurality of upper wirings 17 is determined according to the arrangement of each component in the touch sensor 1 or 1 a. Only the upper wiring 17 located in the direction Dd may be converged into one line.

Moreover, although each sensor electrode 10 has the some transmission electrode 11 and the receiving electrode 12 in said each embodiment, it is not restricted to this form. That is, each sensor electrode 10 may have one transmission electrode 11 and a plurality of reception electrodes 12. In such an embodiment, the arrangement relationship between the transmission electrodes 11 and the reception electrodes 12 described in each of the above embodiments is the opposite. In particular, the plurality of lead wirings 15 (the plurality of lower wirings 16 and the plurality of upper wirings 17) are electrically connected to the respective reception electrodes 12.

In each of the above embodiments, the

ground electrodes

21 and 22 have a rectangular shape in plan view, but the present invention is not limited to such a shape, and the

ground electrodes

21 and 22 may have other various shapes. In particular, it is preferable to design the ground electrode 22 so as to approximate the shape and size of the lead wiring 15. Thereby, the symmetry in the left-right direction Dhm in the view area 4 is secured, and the positional accuracy of sensing can be further improved.

As mentioned above, although the embodiment about the present invention was described, the present invention is not limited only to the above-mentioned embodiment, and various change is possible within the limits of an invention.

As described above, the touch sensor 1 is electrically connected to the view area 4 obtained by transmitting visual information, the plurality of sensor electrodes 10 disposed in the view area 4, and the plurality of sensor electrodes 10. And a plurality of wiring lines 15 connected to each other, a plurality of wiring portions 18 arranged outside the view area 4, and a first ground arranged outside the view area 4 and to which a ground potential is applied. And an electrode 21. The view area 4 extends in the vertical direction Dud and in the horizontal direction Dhm intersecting the vertical direction Dud. The plurality of sensor electrodes 10 extend in the vertical direction Dud, and are arranged in the horizontal direction Dhm at an interval from each other. The plurality of lead-out lines 15 are disposed between the first sensor electrode 101 and the second sensor electrode 102 adjacent to each other among the plurality of sensor electrodes 10. The plurality of wiring portions 18 are electrically connected to the plurality of lead wirings 15 respectively. The plurality of routing wires 15 include one or more lower wires 16 and one or more upper wires 17. One or more lower wirings 16 extend downward Dd from the first sensor electrode 101 and the second sensor electrode 102 toward the lower side of the view area 4. One or more upper wires 17 extend in the upward direction Du from the first sensor electrode 101 and the second sensor electrode 102 toward the upper side of the view area 4. The one or more wiring parts 18 a connected to the one or more upper wiring lines 17 of the plurality of wiring parts 18 are one direction among the left direction Dh and the right direction Dm from above the view area 4 It is routed around the lower side through the outside of (left direction Dh). The first ground electrode 21 is disposed between each of the one or more wiring portions 18 a and the sensor electrode 101 located at the end of the one direction (left direction Dh) of the plurality of sensor electrodes 10. It is arranged.

The first ground electrode 21 extends in the vertical direction Dud from the upper side to the lower side of the view area 4.

Each of the plurality of sensor electrodes 10, the plurality of lead-out lines 15, and the first ground electrode 21 is composed of conductive thin wires 503 arranged in a mesh pattern of a net shape.

The first sensor electrode 101 has a first transmission electrode 111 and a first reception electrode 121. The second sensor electrode 102 has a second transmission electrode 112 and a second reception electrode 122. The first reception electrode 121, the first transmission electrode 111, the second transmission electrode 112, and the second reception electrode 122 are arranged in this order in the right direction Dm. The first transmission electrode 111 includes a plurality of first independent electrodes 1111 to 1115 arranged in the vertical direction Dud. The second transmission electrode 112 includes a plurality of second independent electrodes 1121 to 1125 arranged in the vertical direction Dud. The one or more upper wires 17 are disposed between the first transmission electrode 111 and the second transmission electrode 112, and one or more of the plurality of first independent electrodes 1111 to 1115 are disposed. The first

independent electrodes

1111 and 1122 are electrically connected to one or more second

independent electrodes

1121 and 1122 of the plurality of second independent electrodes 1121 to 1125, respectively. The one or more lower wirings 16 are disposed between the first transmission electrode 111 and the second transmission electrode 112, and the one of the plurality of first independent electrodes 1111 to 1115. One or more other first independent electrodes 1113 to 1115 located below the first

independent electrodes

1111 and 1121, and one or more of the plurality of second independent electrodes 1121 to 1125. It is electrically connected to one or more other second independent electrodes 1123 to 1125 located below the second

independent electrodes

1121 and 1122, respectively.

The first receiving electrode 121 is disposed near the end of the one direction (left direction Dh) in the view area 4.

The first ground electrode 21 is disposed outside the view area 4 and faces the first receiving electrode 121.

The plurality of first independent electrodes 1111 to 1115 and the plurality of second independent electrodes 1121 to 1125 are arranged along a plurality of columns LL1 to LL5 along the left-right direction Dhm. Among the plurality of first independent electrodes 1111 to 1115 and the plurality of second independent electrodes 1121 to 1125, the plurality of columns LL1 to LL5 along the left-right direction Dhm among the plurality of columns LL1 to LL5 When a predetermined potential is applied to a first independent electrode 1112 and a second independent electrode 1122 arranged along a predetermined column of, for example, the column LL2, the columns LL1, LL3 different from the predetermined column LL2 A ground potential is applied to the first

independent electrodes

1111 and 1113 to 1115 and the second

independent electrodes

1121 and 1123 to 1125 disposed along the LL5.

The lowermost first independent electrode 1112 of the one or more first

independent electrodes

1111 and 1122 and the lowermost one of the one or more second

independent electrodes

1121 and 1122 The independent electrodes 1122 are connected to each other and connected to one of the one or more upper wires 17.

Of the one or more other first independent electrodes 1113 to 1115, the uppermost one of the first independent electrode 1113 and the one or more other second independent electrodes 1123 to 1125 are the uppermost one. The second independent electrodes 1123 are connected to each other and connected to one of the one or more lower wirings 16.

A ground potential is applied to the second ground electrode 22. The plurality of sensor electrodes 10 further include a third sensor electrode 103. The third sensor electrode 103 is spaced apart on the right side of the second reception electrode 122, and is spaced apart on the right side of the third reception electrode 123. The transmission electrode 113 of The second ground electrode 22 is disposed between the second reception electrode 122 and the third reception electrode 123.

The ground electrode 22 is disposed between the

sensor electrodes

102 and 103 adjacent to each other among the plurality of sensor electrodes 10, and a ground potential is applied.

In the embodiment, terms such as “upper and lower direction” “upper direction” “lower direction” “upper” “lower” “left and right” “left direction” “right direction” “upper wiring” “lower wiring” It indicates a relative direction determined only by the relative positional relationship of the touch sensor components such as the sensor electrode 10 and the lead wiring 15, and does not indicate an absolute direction such as a vertical direction.

1, 1a touch sensor 2 cover member 3 window frame 4 view area 5 flexible wiring board 7 substrate 7a surface 10 sensor electrode 101 sensor electrode (first sensor electrode)
102 Sensor electrode (second sensor electrode)
11 Transmission electrode 111 Transmission electrode (first transmission electrode)
1111 to 1115 Independent electrode (first independent electrode)
112 Transmitting electrode (second transmitting electrode)
1121 to 1125 Independent electrode (second independent electrode)
11n Transmitting Electrode 12 Receiving Electrode 121 Receiving Electrode (First Receiving Electrode)
122 Receiving electrode (second receiving electrode)
12 n Receiving electrode 15 Lead wiring 16 Lower wiring 17 Upper wiring 18 Wiring part 21 Grand electrode (first ground electrode)
22 Ground electrode (second ground electrode)
Dud Vertical direction Du Up direction Dd Down direction Dhm Left and right direction Dh Left direction Dm Right direction

Claims

A viewing area obtained by transmitting visual information and extending in the vertical direction and the horizontal direction intersecting the vertical direction;
A plurality of sensor electrodes disposed in the view area and extending in the vertical direction and spaced apart from one another in the lateral direction;
A plurality of lead-out lines disposed between the first sensor electrode and the second sensor electrode adjacent to each other among the plurality of sensor electrodes and electrically connected to the plurality of sensor electrodes,
A plurality of wiring portions disposed outside the view area and electrically connected to the plurality of lead wirings,
A first ground electrode disposed outside the view area to which a ground potential is applied;
Equipped with
The plurality of lead wires are
One or more lower wires extending downward from the first sensor electrode and the second sensor electrode toward the lower side of the view area;
One or more upper wires extending upward from the first sensor electrode and the second sensor electrode to the upper side of the view area;
Including
The one or more wiring parts respectively connected to the one or more upper wiring lines of the plurality of wiring parts are downward from the upper side of the view area, passing outward in one of the left direction and the right direction. Are routed around the
The touch sensor, wherein the first ground electrode is disposed between each of the one or more wiring portions and a sensor electrode positioned at the one end of the plurality of sensor electrodes.
In the touch sensor according to claim 1,
The first ground electrode extends in the vertical direction from the upper side to the lower side of the view area.
The touch sensor according to claim 1 or 2
The touch sensor, wherein each of the plurality of sensor electrodes, the plurality of lead-out lines, and the first ground electrode is formed of a conductive thin wire arranged in a mesh pattern of a net shape.
The touch sensor according to any one of claims 1 to 3.
The first sensor electrode comprises a first transmitting electrode and a first receiving electrode,
The second sensor electrode has a second transmitting electrode and a second receiving electrode,
The first reception electrode, the first transmission electrode, the second transmission electrode, and the second reception electrode are arranged in this order in the right direction,
The first transmission electrode comprises a plurality of first independent electrodes arranged in the vertical direction,
The second transmission electrode comprises a plurality of second independent electrodes arranged in the vertical direction,
The one or more upper wires are disposed between the first transmission electrode and the second transmission electrode, and one or more first independent electrodes of the plurality of first independent electrodes and And each of the plurality of second independent electrodes is electrically connected to one or more second independent electrodes,
The one or more lower wires are disposed between the first transmission electrode and the second transmission electrode, and the one or more first independent ones of the plurality of first independent electrodes are disposed. One or more other first independent electrodes located below the electrode, and one or more other ones located below the one or more second independent electrodes of the plurality of second independent electrodes A touch sensor electrically connected to each of the second independent electrodes.
In the touch sensor according to claim 4,
The touch sensor, wherein the first receiving electrode is disposed near the one end in the view area.
In the touch sensor according to claim 5,
The touch sensor, wherein the first ground electrode is disposed outside the view area and faces the first receiving electrode.
The touch sensor according to any one of claims 4 to 6,
The plurality of first independent electrodes and the plurality of second independent electrodes are disposed along a plurality of rows along the left-right direction,
Of the plurality of first independent electrodes and the plurality of second independent electrodes, a first independent electrode and a second independent electrode arranged along a predetermined one of the plurality of columns A touch sensor, wherein a ground potential is applied to a first independent electrode and a second independent electrode arranged along a column different from the predetermined column when a predetermined potential is applied.
The touch sensor according to any one of claims 4 to 7.
The lowermost first independent electrode of the one or more first independent electrodes and the lowermost second independent electrode of the one or more second independent electrodes are connected to each other A touch sensor connected to one of the one or more upper wires.
The touch sensor according to any one of claims 4 to 8.
A first independent electrode positioned uppermost of the one or more other first independent electrodes and a second independent electrode positioned uppermost of the one or more other second independent electrodes Are touch sensors connected to each other and to one of the one or more lower wires.
The touch sensor according to any one of claims 4 to 9.
And a second ground electrode to which a ground potential is applied,
The plurality of sensor electrodes further include a third sensor electrode,
The third sensor electrode includes a third receiving electrode spaced apart on the right side of the second receiving electrode and a third transmitting electrode spaced apart on the right side of the third receiving electrode. Have
The touch sensor, wherein the second ground electrode is disposed between the second reception electrode and the third reception electrode.
A viewing area obtained by transmitting visual information and extending in the vertical direction and the horizontal direction intersecting the vertical direction;
A plurality of sensor electrodes disposed in the view area and extending along the vertical direction and spaced apart from one another in the horizontal direction;
A plurality of lead-out wires disposed between adjacent sensor electrodes of the plurality of sensor electrodes and electrically connected to the plurality of sensor electrodes,
Equipped with
The plurality of lead wires are
A plurality of lower wirings extending downward from the adjacent sensor electrodes toward the lower side of the view area;
A plurality of upper wirings extending upward from the adjacent sensor electrodes to the upper side of the view area;
Including
The plurality of lower wirings and the plurality of upper wirings are
Among the plurality of lower wirings, the lower wirings positioned at the upper end are connected to the sensor electrodes adjacent to each other, or
Among the plurality of upper wires, the upper wires located at the lower end are connected to the adjacent sensor electrodes,
It is configured as a touch sensor.
A viewing area obtained by transmitting visual information and extending in the vertical direction and the horizontal direction intersecting the vertical direction;
A plurality of sensor electrodes disposed in the view area and extending along the vertical direction and spaced apart in the horizontal direction;
A plurality of lead wires disposed between the plurality of sensor electrodes and electrically connected to the plurality of sensor electrodes;
A ground electrode disposed between adjacent ones of the plurality of sensor electrodes and to which a ground potential is applied;
Touch sensor with.