CN-121986316-A - Touch sensor

Abstract

The touch sensor (1) is provided with a shield wiring (40) set to a shield potential that is higher than the ground potential. The shield wiring (40) is arranged between the second wiring portion (16 a) and the ground portion (30). The shield wiring (40) is not electrically connected to any of the transmitting electrode (11), the receiving electrode (12), the first wiring section (15), the second wiring section (16), and the grounding section (30).

Inventors

• MORIMOTO KAZUMI
• Tanba Hiromitsu
• SATO HIKARU

Assignees

• 松下知识产权经营株式会社

Dates

Publication Date

20260505

Application Date

20240925

Priority Date

20231012

Claims (6)

1. 1. A touch sensor is characterized by comprising a transmitting electrode, a receiving electrode, a plurality of first wiring parts, a second wiring part, a grounding part and a shielding wiring, A plurality of the first wiring portions are electrically connected to the transmitting electrode, The second wiring portion is electrically connected to the receiving electrode, The ground portion is set to a ground potential and is located between the first wiring portion and the second wiring portion, The shield wiring is set to a shield potential, the shield potential becomes a potential higher than the ground potential, The transmitting electrode, the receiving electrode, the first wiring portion, the second wiring portion, the ground portion, and the shield wiring are each formed of a conductive metal, The shield wiring is arranged between the second wiring portion and the ground portion, The shield wiring is not electrically connected to any of the transmitting electrode, the receiving electrode, the first wiring portion, the second wiring portion, and the grounding portion.
2. 2. The touch sensor of claim 1, wherein: An electric signal identical to an electric signal flowing in the second wiring portion flows in the shield wiring.
3. 3. The touch sensor of claim 1, wherein: the shield wiring includes a first base trunk, a second base trunk, and a first bridging line, The first backbone line extends in a first direction in which the ground portion extends, The second base trunk line is arranged at a spacing from the first base trunk line and extends in the first direction, The first bridge wire connects the first and second base trunks and extends in a direction different from the first direction.
4. 4. A touch sensor according to claim 3, wherein: the shield wiring further includes a third base trunk and a second bridging line, The third backbone line extends in the first direction and is located on the opposite side of the first backbone line with respect to the second backbone line, The second bridge wire connects the second base trunk and the third base trunk and extends in a direction different from the first direction.
5. 5. The touch sensor of claim 1, wherein: The shield wiring extends parallel to the second wiring portion.
6. 6. The touch sensor of claim 5, wherein: In the case where the area where the transmitting electrode and the receiving electrode are arranged is set as an active area, and the area where the first wiring portion, the second wiring portion, the ground portion, and the shield wiring are arranged is set as an inactive area, The active region includes a reference edge that forms a portion of an outer edge in the active region, The inactive area includes a connection area for connecting the plurality of first wiring portions, the plurality of second wiring portions, the ground portion, and the shield wiring to an external device, The connection region is located in the vicinity of the reference edge and is arranged at a distance from the reference edge, The ground portion is disposed in a range extending from a position corresponding to the connection region in the extending direction of the reference edge to the vicinity of the outer edge of the active region, The shield wiring extends from a position corresponding to the connection region at least to a position identical to an end of the ground portion in an extending direction of the reference side.

Description

Touch sensor Technical Field The present invention relates to a touch sensor. Background Heretofore, as for a capacitive touch sensor, a touch sensor shown in patent document 1, for example, has been known. Specifically, patent document 1 discloses a touch sensor (touch panel) including a plurality of sensor electrodes located in an active region and a plurality of frame wirings located in an inactive region. The plurality of sensor electrodes are constituted by a plurality of transmitting electrodes (second sensor electrode array 45) and a plurality of receiving electrodes (first sensor electrode array 41). The plurality of frame wirings are constituted by a plurality of transmission wirings, a plurality of reception wirings, and a plurality of ground wirings (transmission/reception wiring separating ground wirings 63). Among the plurality of transmission electrodes, each transmission electrode is electrically connected to another transmission electrode. Among the plurality of receiving electrodes, each receiving electrode is electrically connected to the other receiving electrode. The plurality of ground wirings are arranged to be located between the plurality of transmission wirings and the plurality of reception wirings. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2015-148942 Disclosure of Invention Technical problem to be solved by the invention In the touch sensor of patent document 1, a predetermined potential for detecting an electric field emitted from a plurality of transmitting electrodes is generally applied to a plurality of receiving electrodes at all times. Therefore, the state in which the electric signal corresponding to the predetermined potential flows through the receiving wiring is maintained. On the other hand, in the case where each frame wiring is formed of a conductive metal such as copper, from the viewpoint of the relationship between the ground wiring and the receiving wiring located closest to the ground wiring, as described above, since an electric signal always flows in the receiving electrode, copper as a forming material of the receiving wiring is easily ionized. Electrons released into the atmosphere due to the ionization are adsorbed by oxygen and moisture contained in the atmosphere. As a result, hydroxide ions are generated. Particularly, hydroxide ions are easily generated in a high-temperature and high-humidity environment. Further, electrolysis occurs in the receiving wiring due to a potential difference between the grounding wiring set to the ground potential and the receiving wiring located closest to the grounding wiring. Copper (II) hydroxide is generated in the receiving wiring located closest to the ground wiring due to the electrolysis. In addition, copper (II) hydroxide is heated and easily changed into copper (II) oxide under a high-temperature and high-humidity environment. That is, in the high-temperature and high-humidity environment, the receiving wiring located closest to the ground wiring is susceptible to corrosion according to the above principle. As a result, the sensor electrode (first sensor electrode array 41) electrically connected to the corroded receiving wiring may significantly reduce the sensing function of the touch sensor. The present disclosure has been made to solve the above-described problems, and an object thereof is to prevent corrosion of wiring. Technical solution for solving the technical problems In order to achieve the above object, a touch sensor according to an embodiment of the present disclosure includes a transmitting electrode, a receiving electrode, a first wiring portion, a second wiring portion, a grounding portion, and a shield wiring. The first wiring portion is electrically connected to the transmitting electrode, the second wiring portion is electrically connected to the receiving electrode, the ground portion is set to a ground potential and is located between the first wiring portion and the second wiring portion, and the shield wiring is set to a shield potential which is higher than the ground potential. The transmitting electrode, the receiving electrode, the first wiring portion, the second wiring portion, the ground portion, and the shield wiring are each formed of a conductive metal. The shield wiring is arranged between the second wiring portion and the ground portion. The shield wiring is not electrically connected to any of the transmitting electrode, the receiving electrode, the first wiring portion, the second wiring portion, and the ground portion. Effects of the invention According to the present disclosure, the wiring can be prevented from being corroded. Drawings Fig. 1 is an overall perspective view of a touch sensor according to an embodiment of the present disclosure. Fig. 2 is a sectional view taken along line II-II of fig. 1. Fig. 3 is a perspective view schematically showing the touch sensor when viewed from the front side. Fig. 4 is a sch