WO2019056580A1

WO2019056580A1 - Touch panel and touch device

Info

Publication number: WO2019056580A1
Application number: PCT/CN2017/114411
Authority: WO
Inventors: 李明麟; 李学才; 叶丹霞; 龚得杏; 黄宜浪; 郭永龙
Original assignee: 意力(广州)电子科技有限公司
Priority date: 2017-09-21
Filing date: 2017-12-04
Publication date: 2019-03-28
Also published as: CN107665065A; TW201915690A

Abstract

Provided are a touch panel and a touch device. The touch panel comprises a first touch electrode layer and a second electrode layer which are arranged at different layers and insulated from each other. The first touch electrode layer comprises multiple first touch electrodes arranged in parallel. The second electrode layer comprises multiple second touch electrodes arranged in parallel. Extension directions of the first touch electrodes and the second touch electrodes intersect. At least one of the first touch electrodes and the second touch electrodes is a target touch electrode. The target touch electrode is made of a transparent electrically-conductive material having a sheet resistance lower than a preset value. The target touch electrode has a mesh structure.

Description

Touch panel and touch device

Technical field

This embodiment relates to the field of touch screen technologies, and relates to a touch panel and a touch device.

Background technique

With the development of electronic technology, touch screens are widely used in mobile phones, digital cameras, media players, navigation systems, PAD (tablets), gaming devices and displays.

In the related art, the touch electrode of the touch screen is mainly formed of Indium Tin Oxide (ITO) material, and the square resistance is above 100 Ω/□. Due to the high impedance, it can only be applied to some small-sized touch screens. Large touch screens with lower impedance requirements are not suitable. In order to solve the above problem, a low-resistance metal grid is generally used as a touch electrode of a large-sized touch screen.

However, since the metal mesh itself is opaque, the wiring in the display area is easily exposed, so a small line width (below 5 μm) is required in the process to achieve a good concealing effect, so that the metal mesh preparation process High difficulty.

Summary of the invention

The present invention provides a touch panel and a touch device, which can reduce the preparation difficulty of the touch electrode on the premise of satisfying the requirement of the low-impedance of the touch electrode and the overall high light transmittance of the large-screen touch screen.

In a first aspect, the embodiment provides a touch panel, and the touch panel includes:

a first touch electrode layer and a second touch electrode layer disposed in different layers;

The first touch electrode layer includes a plurality of first touch electrodes arranged in parallel, and the second touch electrode layer includes a plurality of second touch electrodes arranged in parallel, the first touch electrodes and the Second touch The direction of extension of the poles intersects;

At least one of the first touch electrode and the second touch electrode is a target touch electrode, and the target touch electrode is formed by using a transparent conductive material with a square resistance lower than a preset value;

The target touch electrode is a grid structure.

In a second aspect, the embodiment further provides a touch device, which includes the touch panel according to the first aspect.

The touch panel provided by the embodiment enables the square resistance of the target touch electrode to meet the requirements of the large-size touch screen, and when applied to the touch display device, the transparent target touch electrode can be partially located in the display area without affecting The display effect of the touch display device is such that the target touch electrode line width can be made larger, thereby reducing the difficulty of preparing the target touch electrode.

DRAWINGS

1 is a schematic top plan view of a touch panel provided by this embodiment;

Figure 2 is a cross-sectional structural view taken along the line AA' in Figure 1;

3 is a schematic structural view of a first touch electrode layer of FIG. 1;

Figure 4 is a partial enlarged view of the rectangular dotted line frame of Figure 3;

Figure 5 is a partial enlarged view of the rectangular dotted line frame of Figure 3;

FIG. 6 is a schematic structural diagram of a touch device according to the embodiment; FIG.

FIG. 7 is a schematic structural diagram of a touch display panel according to the embodiment.

Detailed ways

The terms "vertical", "horizontal", "left", "right", and the like, as used herein, are for the purpose of illustration and are not intended to be the only embodiment. Unless otherwise defined, used herein All technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items. The terms "first," "second," and the like, as used herein, are used herein to distinguish between objects, but such objects are not limited by these terms.

FIG. 1 is a schematic top plan view of a touch panel provided by the embodiment. Figure 2 is a cross-sectional structural view taken along the line AA' in Figure 1. As shown in FIG. 1 , the touch panel 10 includes a first touch electrode layer and a second touch electrode layer, wherein the first touch electrode layer includes a plurality of first touch electrodes 121 arranged in parallel, and the second touch The electrode layer includes a plurality of second touch electrodes 131 arranged in parallel, and the extending directions of the first touch electrodes 121 and the second touch electrodes 131 intersect. As shown in FIG. 2 , the first touch electrode layer 120 and the second touch electrode layer 130 are disposed in different layers, and the first insulating layer 150 is disposed between the first touch electrode layer 120 and the second touch electrode layer 130 . The first touch electrode 121 and the second touch electrode 131 can cooperate to realize the detection of the user's touch operation. Optionally, the first insulating layer 150 can serve as an insulating substrate of the first touch electrode layer 120. That is, the first touch electrode layer 120 is prepared by sputtering or coating on the first insulating layer 150. Up. Optionally, the material of the first insulating layer 150 may be polyethylene terephthalate (PET), polyimide (PI), polycarbonate (Poly Carbonate, PC), cyclic olefin. Polymer (Cyclo Olefin Polymer, COP) and the like. The material of the first insulating layer 150 can be selected according to actual production needs. A second connection layer 160 may be disposed between the second touch electrode layer 130 and the first insulating layer 150 to implement a connection between the first touch electrode layer 120 and the second touch electrode layer 130. Optionally, the second connecting layer 160 may be an Optically Clear Adhesive (OCA), and may be other materials that can realize the connecting function.

Exemplarily, the second touch electrode layer 130 is provided with a second insulating layer 170 on a side away from the first insulating layer 150 . Optionally, the second insulating layer 170 can serve as an insulating substrate of the second touch electrode layer 130 , that is, the second touch electrode layer 130 is prepared on the second insulating layer 170 . Optionally, the material of the second insulating layer 170 may be the same as or different from the material of the first insulating layer 150, and the material of the second insulating layer 170 may be selected according to actual production needs.

For example, in the embodiment, the first touch electrode 121 is a target touch electrode, and the target touch electrode is formed by using a transparent conductive material with a square resistance lower than a preset value. 3 is a schematic structural view of the first touch electrode layer of FIG. 1. Figure 4 is a partial enlarged view of the rectangular dotted line frame of Figure 3. As shown in FIG. 4, the first touch electrode 120 (target touch electrode) has a mesh structure.

The target touch electrode is a specially designed touch electrode in the embodiment, and the touch electrode can meet the low impedance requirement of the large-size touch screen, can ensure the overall light transmittance of the screen, and is relatively simple to prepare. The transparent conductive material with a square resistance lower than the preset value is used to form the target touch electrode, which can reduce the overall resistance of the target touch electrode and meet the requirement of the low-impedance of the touch electrode on the large-size touch screen. When applied to a touch display panel, the transparent nature allows the target touch electrode to be partially located in the display area without affecting the display effect of the display panel, so that the line width of the target touch electrode can be made larger, thereby achieving a lower target. The beneficial effects of the touch electrode preparation process difficulty.

In this embodiment, the target touch electrode is used as the first touch electrode 121 as an example. In other embodiments of the present embodiment, the target touch electrode may also be the second touch electrode 131 or the first touch electrode 121. And the second touch electrode 131. For example, the material of the non-target touch electrodes in the first touch electrode 121 and the second touch electrode 131 may be low resistance ITO, silver metal mesh, copper metal mesh or nano silver.

In addition, designing the target touch electrode as a grid structure can reduce the coverage of the target touch electrode, thereby improving the light transmittance of the target touch electrode.

In this embodiment, the shape, size, number, and extension direction of the first touch electrode 121 and the second touch electrode 131 can be adjusted according to actual conditions.

The touch panel 10 of the present embodiment includes a first touch electrode layer 120 and a second touch electrode layer 130. The first touch electrode layer 120 includes a plurality of first touch electrodes arranged in parallel. The second touch electrode layer 130 includes a plurality of second touch electrodes 131 arranged in parallel, and the extending directions of the first touch electrodes 121 and the second touch electrodes 131 intersect, the first touch electrodes 121 and the At least one of the second touch electrodes 131 is a target touch electrode, wherein the target touch electrode is formed by a transparent conductive material having a square resistance lower than a preset value, and is a grid structure, so that the square resistance of the target touch electrode can be When the touch panel is used, the transparent target touch electrode can be partially located in the display area without affecting the display effect of the touch display device, so the line width can be made larger. , thereby reducing the difficulty of preparation of the target touch electrode.

Optionally, the preset value may be 70 Ω/□. The touch electrode needs to be driven by the touch IC. Therefore, the square resistance of the touch electrode should match the driving capability of the touch IC. For a large touch screen, the number, length and width of the touch electrodes are It is relatively large, so its square resistance should be relatively low. Based on the above analysis, in this embodiment, the square resistance of the target touch electrode can be set to be lower than 70 Ω/□.

Optionally, the transparent conductive material used for the target touch electrode may be ITO. In other embodiments of the embodiment, the transparent conductive material may also be ITO/Ag, ITO/Ag/ITO, ITO/Cu/ITO, nano silver wire or Polyethylenedioxythiophene (PEDOT). In the present embodiment, the ITO having a square resistance lower than a preset value can be prepared by a sputtering or coating method, and the process is mature, so that the production cost can be reduced while ensuring a high yield.

Optionally, the first touch electrode 121 can be a touch driving electrode, and the second touch electrode 131 can be a touch sensing electrode; or the first touch electrode 121 can be a touch sensing electrode, and the second touch electrode 131 It can be a touch drive electrode.

Optionally, the touch panel 10 can be a touch display panel. As shown in FIG. 2, the touch display panel includes a fixed substrate 110. The first touch electrode layer 120 is insulatively attached to the fixed substrate 110 and is separated from the touch display panel. On one side of the surface, the second touch electrode layer 130 is insulatively attached to the side of the first touch electrode 120 away from the fixed substrate 110. Exemplarily, the fixed substrate 110 may be a cover plate or a polarizer.

The insulating substrate is an insulating material, and a first connecting layer 140 is disposed between the first touch electrode layer 120 and the first touch electrode layer 120 to achieve a connection between the first touch electrode layer 120 and the fixed substrate 110. A first insulating layer 150 is disposed between the first touch electrode layer 120 and the second touch electrode layer 130 , and a second insulating layer 170 is disposed on a side of the second touch electrode layer 130 away from the first insulating layer 150 . The materials and structures of the first connection layer 140 and the second connection layer 160 may be the same. For example, the materials of the first connection layer 140 and the second connection layer 160 may both be OCA. It can be understood that the materials and structures of the first connection layer 140 and the second connection layer 160 may also be different as long as the connection can be achieved.

Optionally, the first touch electrode layer 120 may be a conductive layer having the same structure or different structure as the second touch electrode layer 130 . Continuing to refer to FIG. 2 , for example, if the first touch electrode layer 120 and the second touch electrode layer 130 have the same structure, the first touch electrode layer 120 and the second touch electrode layer 130 pass through the first insulating layer. 150 is insulated and connected through the second connection layer 160. If the structure is different, for example, the first touch electrode layer 120 may be a transparent conductive transfer film. In this case, the first touch electrode layer 120 itself is composed of a two-layer structure, including an insulating substrate, and coated on the insulating substrate. The conductive layer, the conductive layer may be nano silver wire. In this case, the first touch electrode layer 120 and the second touch electrode layer 130 can be insulated by a process such as hot pressing, and the insulating substrate is deformed by heat to achieve connection with the second touch electrode layer 130. The structure of the second connection layer 160 may be omitted according to actual conditions.

Continuing to refer to FIG. 3, the target touch electrode may include a plurality of annular portions 1211 and a plurality of connecting portions 1212. The annular portion 1211 is spaced apart from the connecting portion 1212, and the adjacent annular portion 1211 and the connecting portion 1212 are connected. The shape and size of the target touch electrode shown in FIG. 3 and the number of the annular portion 1211 and the connecting portion 1212 The amount can be adjusted according to the actual situation.

Figure 5 is a partial enlarged view of the rectangular dotted line frame of Figure 3. As shown in FIG. 5, the other areas of the same layer of the target touch electrode are further provided with a transmittance adjusting layer 122, and the transmittance adjusting layer 122 is insulated from the target touch electrode. The transmittance adjustment layer 122 includes a plurality of discrete light transmission adjustment portions 1221 having the same structure as the target touch electrode grid structure.

Since the light transmittance of the low-resistance transparent conductive material (for example, the low-resistance ITO material) is relatively low, the light transmittance of the region where the target touch electrode is disposed is lower than other regions of the touch panel, when the touch panel When applied to a touch display device, a part of the target touch electrodes located in the display area may form a display shadow, which affects the display effect of the touch display device. In order to avoid the above problem, in this embodiment, a transmittance adjusting layer is disposed in other areas of the same layer of the target touch electrode, so that the light transmittance of the film layer of the target touch electrode is more uniform, and the touch display device is avoided. The appearance of obvious shadows improves the display effect of the touch display device.

FIG. 6 is a schematic structural diagram of a touch device according to the embodiment. The touch device 20 can be the touch panel 10 including any of the above embodiments.

FIG. 7 is a schematic structural diagram of a touch display panel according to the embodiment. As shown in FIG. 7 , the touch display panel includes a fixed substrate 110 . The first touch electrode layer 120 is insulatively attached to the side of the fixed substrate 110 away from the light emitting surface of the touch display panel, and the second touch electrode layer 130 is insulated and attached. A display component 180 is disposed on a side of the second touch electrode layer 130 away from the first touch electrode layer 120 on a side of the first touch electrode 120 away from the fixed substrate 110 . Exemplarily, the fixed substrate 110 may be a cover plate or a polarizer.

When the fixed substrate 110 is a cover plate, the display component 180 is an organic light emitting diode OLED.

When the fixed substrate 110 is a polarizer, the display component 180 is a liquid crystal display panel.

Optionally, the liquid crystal display panel includes a backlight module, a TFT array substrate, and the like in the light emitting direction. a first polarizer, a first glass substrate, a first alignment film, a liquid crystal, a second alignment film, a color filter, a second glass substrate, and a second polarizer. The fixed substrate 110 refers to the second polarizer.

Industrial applicability

The touch panel provided by the present disclosure enables the square resistance of the target touch electrode to meet the requirements of the large-size touch screen, and when applied to the touch display device, the transparent target touch electrode can be partially located in the display area without affecting the touch. The display effect of the display device is controlled, so that the target touch electrode line width can be made larger, thereby reducing the difficulty of preparing the target touch electrode.

Claims

A touch panel includes a first touch electrode layer and a second touch electrode layer disposed in different layers;

The first touch electrode layer includes a plurality of first touch electrodes arranged in parallel, and the second touch electrode layer includes a plurality of second touch electrodes arranged in parallel, the first touch electrodes and the The extending directions of the second touch electrodes intersect;

At least one of the first touch electrode and the second touch electrode is a target touch electrode, and the target touch electrode is formed by using a transparent conductive material with a square resistance lower than a preset value;

The target touch electrode is a grid structure.
The touch panel of claim 1 , wherein the target touch electrode comprises a plurality of annular portions and a plurality of connecting portions, the annular portions are spaced apart from the connecting portion, adjacent to the annular portion and the The connecting parts are connected.
The touch panel of claim 1 or 2, wherein another area in the same layer as the target touch electrode is further provided with a transmittance adjustment layer, the transmittance adjustment layer and the target touch electrode Insulation setting

The transmittance adjusting layer includes a plurality of discrete light transmission adjusting portions, and the light transmitting adjusting portion is the same mesh structure as the target touch electrodes.
The touch panel of claim 1, wherein the preset value is 70 Ω/□.
The touch panel of claim 1 , wherein the first touch electrode is a touch driving electrode, and the second touch electrode is a touch sensing electrode.
The touch panel of claim 1 , wherein the first touch electrode is a touch sensing electrode, and the second touch electrode is a touch driving electrode.
The touch panel of claim 1, wherein the transparent conductive material is indium tin oxide.
The touch panel of any one of the preceding claims, wherein the touch panel is a touch display panel, the touch display panel includes a fixed substrate, and the first touch electrode layer is insulatively attached to the touch panel. Place The second touch electrode layer is insulatively attached to a side of the first touch electrode away from the fixed substrate, and the second touch electrode layer is disposed away from a side of the touch surface of the touch display panel. A display component is disposed away from a side of the first touch electrode layer.
The touch panel of claim 8, wherein the fixed substrate is a cover plate, and the display component is an organic light emitting diode OLED.
The touch panel according to claim 8, wherein the fixed substrate is a polarizer, and the display component is a liquid crystal display panel.
A touch device comprising the touch panel of any one of claims 1-8.