CN-122003655-A - Touch sensor

Abstract

The touch sensor (1) is provided with a base material (40) which is made of an insulating material, a first touch electrode (10) which is positioned below the base material (40), a second touch electrode (20) which is positioned above the base material (40), and an antenna electrode (30) which is positioned on the same layer as the first touch electrode (10) or below the first touch electrode (10), wherein the second touch electrode (20) is a grid electrode which is formed of fine metal wires formed in a grid shape, and when the wavelength of an electric wave used by the touch sensor (1) is lambda, the distance between the antenna electrode (30) and the second touch electrode (20) is lambda/32 or less.

Inventors

• Yongjin Xiongyi
• ARAKI KOTA
• SHIBATA KENJI
• FUJITA KOUSUKE
• Ji Chuanxue

Assignees

• 松下知识产权经营株式会社

Dates

Publication Date

20260508

Application Date

20240909

Priority Date

20231003

Claims (10)

1. 1. A touch sensor is provided with: a base material made of an insulating material; A first touch electrode located below the substrate; a second touch electrode above the substrate, and An antenna electrode located at the same layer as the first touch electrode or below the first touch electrode, Wherein the second touch electrode is a grid electrode formed of fine metal wires formed in a grid shape, When the wavelength of the radio wave to be used is λ, the distance between the antenna electrode and the second touch electrode is λ/32 or less.
2. 2. The touch sensor of claim 1, wherein, The antenna electrode is a mesh electrode formed of fine metal wires formed in a mesh shape.
3. 3. The touch sensor of claim 2, wherein, The first touch electrode is a mesh electrode formed of fine metal wires formed in a mesh shape.
4. 4. The touch sensor of claim 3, wherein, The pitch of the thin metal wires constituting the second touch electrode is equal to or greater than the pitch of the thin metal wires constituting the antenna electrode.
5. 5. The touch sensor of claim 4, wherein, The pitch of the thin metal wires constituting the second touch electrode is 200 μm or more.
6. 6. The touch sensor of any one of claims 1-5, wherein, The antenna electrode is located below the first touch electrode.
7. 7. The touch sensor of any one of claims 1-5, wherein, The touch sensor has an active area and an inactive area outside the active area, The antenna electrode is disposed in the active region.
8. 8. The touch sensor of claim 7, wherein, The antenna electrode is disposed between two adjacent first touch electrodes.
9. 9. The touch sensor of claim 7, wherein, The antenna electrode is disposed in the active region at a position near the inactive region.
10. 10. The touch sensor of claim 3, wherein, A plurality of the first touch electrodes are disposed along a first direction, A plurality of the second touch electrodes are disposed along a second direction crossing the first direction.

Description

Touch sensor Technical Field The present disclosure relates to a touch sensor, and more particularly, to a touch sensor having an antenna function. Background In an electronic device such as a mobile terminal including a smart phone and a tablet pc, a display (touch panel) including a touch sensor for detecting an input operation to the electronic device by a user and a display panel is used. As a touch sensor, a touch sensor that detects an input operation of a user by an electrostatic capacitance method is known. In the capacitive touch sensor, a change in capacitance generated when a user's finger touches or approaches a display screen is detected by a touch electrode, thereby detecting a position touched by the user. Further, a mobile terminal such as a smart phone or a tablet pc is equipped with an antenna for transmitting and receiving radio waves. The antenna is disposed on, for example, a display panel of a display of a portable terminal, but a space for disposing the antenna in the display panel is reduced due to a reduction in thickness, a reduction in size, and a reduction in weight of the display. For this reason, a technology has been proposed in which an antenna is mounted on a touch sensor in a display including the touch sensor and a display panel (for example, patent document 1). Prior art literature Patent literature Patent document 1 Japanese patent No. 6421077 Disclosure of Invention Problems to be solved by the invention In a touch sensor in which a touch electrode and an antenna electrode (antenna) are disposed, if the touch electrode is disposed on the top surface side of the touch sensor and the antenna electrode is disposed on the bottom surface side of the touch sensor, a radio wave radiated from the antenna electrode is reflected by the touch electrode and is less likely to radiate from the touch surface side to the outside of the touch sensor. The present disclosure has been made to solve the above-described problems, and an object of the present disclosure is to provide a touch sensor capable of radiating radio waves of an antenna electrode in a front direction of the touch sensor even when the touch electrode is disposed on a top surface side as a mesh electrode and the antenna electrode is disposed on a bottom surface side. Solution for solving the problem In order to achieve the above object, one embodiment of a touch sensor according to the present disclosure includes a substrate made of an insulating material, a first touch electrode located below the substrate, a second touch electrode located above the substrate, and an antenna electrode located on the same layer as the first touch electrode or below the first touch electrode, wherein the second touch electrode is a grid electrode made of fine metal wires formed in a grid shape, and a distance between the antenna electrode and the second touch electrode is λ/32 or less when a wavelength of an electric wave to be used is λ. ADVANTAGEOUS EFFECTS OF INVENTION According to the present disclosure, even if a touch electrode as a grid electrode is disposed on the top surface side and an antenna electrode is disposed on the bottom surface side, radio waves of the antenna electrode can be radiated in the front direction of the touch sensor. Drawings Fig. 1 is a plan view schematically showing a touch sensor according to an embodiment. Fig. 2 is an enlarged plan view of the touch sensor according to the embodiment. Fig. 3 is an enlarged cross-sectional view of the touch sensor according to the embodiment. Fig. 4 is a diagram showing the structure of the touch sensor of the comparative example. Fig. 5 is a diagram for explaining the operational effects of the touch sensor according to the embodiment. Fig. 6 is a diagram showing a model of the touch sensor of the comparative example and the embodiment used in the simulation. Fig. 7 is a diagram showing electric field distribution of each of the touch sensors of the comparative example and the embodiment shown in fig. 6. Fig. 8 is a diagram showing a model and a layer structure of a touch sensor used in an experiment for confirming an effect of the touch sensor according to the embodiment. Fig. 9 is a diagram showing the structures of five samples 1 to 5 in an experiment for confirming the effect of the touch sensor according to the embodiment. Fig. 10 is a diagram showing the front gain of the antenna in the five samples 1 to 5 shown in fig. 9. Fig. 11 is a diagram showing electric field distribution of five samples 1 to 5 shown in fig. 9. Fig. 12 is an enlarged cross-sectional view of the touch sensor according to modification 1. Fig. 13 is an enlarged cross-sectional view of the touch sensor according to modification 2. Fig. 14 is an enlarged plan view of the touch sensor according to modification 3. Fig. 15 is an enlarged plan view of the touch sensor according to modification 4. Detailed Description Embodiments of the present disclosure are described below with reference to the d