CN212208258U

CN212208258U - Touch control screen

Info

Publication number: CN212208258U
Application number: CN202021157850.XU
Authority: CN
Inventors: 贺强; 雷贝; 彭颖杰; 冯晓丽; 姜锴; 潘克菲; 徐晔
Original assignee: Suzhou Huige Photoelectric Technology Co ltd; Nuovo Film Inc
Current assignee: Suzhou Huige Photoelectric Technology Co ltd; Nuovo Film Inc
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2020-12-22
Anticipated expiration: 2030-06-19

Abstract

The utility model relates to a touch screen, include first touch-control electrode layer, second touch-control electrode layer, be located first touch-control electrode layer with insulating layer between the second touch-control electrode layer, first touch-control electrode layer is patterned transparent conductive film layer, second touch-control electrode layer is patterned metal wire net check layer, the second touch-control electrode that metal wire net check layer includes metal wire or enameled wire constitution. Compare in the touch-control screen on two-layer metal wire net check layer, the utility model discloses a touch-control screen has increased the capacitance value of two touch-control electrode layers, reinforcing interference killing feature to can further reduce the line footpath of metal wire, and can not influence the capacitance value between two lines by a wide margin.

Description

Touch control screen

Technical Field

The utility model relates to a capacitive touch screen field especially relates to a touch screen.

Background

The existing metal grid touch screen is manufactured by printing metal wires of 10-30 mu m on the surface of a pressure-sensitive adhesive film. However, when the metal grid capacitive touch screen is zero-attached or fully attached to the surface of a liquid crystal, the emitting layer and the receiving layer are both made of metal wires with the thickness of 10-30 μm, and the capacitance value between the emitting layer and the receiving layer is extremely small, so that the metal grid capacitive touch screen is easily interfered by various electromagnetic fields of the liquid crystal screen and only can adopt a frame-attached structure with a certain reserved space.

In view of the above, it is desirable to provide a touch panel to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a touch screen.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:

a touch screen comprises a first touch electrode layer, a second touch electrode layer and an insulating layer located between the first touch electrode layer and the second touch electrode layer, wherein the first touch electrode layer is a patterned transparent conductive film layer, the second touch electrode layer is a patterned metal wire mesh layer, and the metal wire mesh layer comprises a second touch electrode formed by metal wires or enameled wires.

Further, the transparent conductive film layer is a nano metal layer, an ITO layer, a carbon nanotube layer, a graphene layer, or a nano-imprinted metal mesh layer.

Further, the nano metal layer comprises a nano metal wire, or a nano metal rod, or a nano metal film.

Furthermore, the touch screen further comprises first electrode leads in one-to-one correspondence with the first touch electrodes of the first touch electrode layer, the first electrode leads are metal wires or enameled wires, and the enameled wires comprise lap joint parts, wherein the inner metal wire cores of the enameled wires are exposed outwards so as to be electrically connected with the first touch electrodes; or the first electrode lead is an electrode wire formed by conductive paste.

Further, when the first electrode lead is a metal wire or an enameled wire, the metal wire or the enameled wire and the second touch electrode layer are located on the same layer.

Furthermore, the insulating layer is a complete film layer structure located between the first touch electrode layer and the second touch electrode layer, conductive holes corresponding to the first touch electrodes one to one are formed in the insulating layer, and the first touch electrodes and the first electrode leads are electrically connected at the conductive holes.

Further, the touch screen further comprises second electrode leads in one-to-one correspondence with the second touch electrodes, and the second electrode leads are extensions of metal wires or enameled wires constituting the second touch electrodes.

Further, the touch electrodes of the first touch electrode layer are in an arc-shaped series structure or a diamond-shaped series structure;

and/or the metal wire or the enameled wire forming the second touch electrode is in a reciprocating type, and the whole metal wire or the enameled wire is in a series structure.

Furthermore, the touch screen further comprises a cover plate, wherein the cover plate is located on one side, away from the insulating layer, of the first touch electrode layer, or the cover plate is located on one side, away from the insulating layer, of the second touch electrode layer.

Furthermore, the touch screen comprises a cover plate, a first adhesive layer positioned on one side of the cover plate, a metal wire mesh layer positioned on one side of the first adhesive layer away from the cover plate, a second adhesive layer positioned on one side of the metal wire mesh layer away from the adhesive layer, a patterned transparent conductive film layer positioned on one side of the second adhesive layer away from the metal wire mesh layer, and a base material positioned on one side of the patterned transparent conductive film layer away from the second adhesive layer;

or the touch screen comprises a cover plate, a first adhesive layer positioned on one side of the cover plate, a metal wire mesh layer positioned on one side of the first adhesive layer, which is far away from the cover plate, a second adhesive layer positioned on one side of the metal wire mesh layer, which is far away from the adhesive layer, a base material positioned on one side of the second adhesive layer, which is far away from the metal wire mesh layer, and the patterned transparent conductive film layer positioned on one side of the base material, which is far away from the second adhesive layer;

or the touch screen comprises a cover plate, a metal wire mesh layer positioned on one side of the cover plate, an adhesive layer positioned on one side of the metal wire mesh layer, which is far away from the cover plate, a base material positioned on one side of the adhesive layer, which is far away from the metal wire mesh layer, and a patterned transparent conductive film layer positioned on one side of the base material, which is far away from the adhesive layer;

or the touch screen comprises a cover plate, a metal wire mesh layer positioned on one side of the cover plate, an adhesive layer positioned on one side of the metal wire mesh layer, which is far away from the cover plate, a patterned transparent conductive film layer positioned on one side of the adhesive layer, which is far away from the metal wire mesh layer, and a base material positioned on one side of the patterned transparent conductive film layer, which is far away from the adhesive layer;

or the touch screen structure comprises a cover plate, an adhesive layer positioned on one side of the cover plate, a metal wire mesh grid layer positioned on one side of the adhesive layer, which is far away from the cover plate, a patterned transparent conductive film layer positioned on one side of the metal wire mesh grid layer, which is far away from the adhesive layer, and a base material positioned on one side of the patterned transparent conductive film layer, which is far away from the metal wire mesh grid layer, wherein the metal wire mesh grid layer is formed by enameled wires;

or the touch screen comprises a cover plate, a first adhesive layer positioned on one side of the cover plate, a patterned transparent conductive film layer positioned on one side of the first adhesive layer, which is far away from the cover plate, a base material positioned on one side of the patterned transparent conductive film layer, a second adhesive layer positioned on one side of the base material, which is far away from the patterned transparent conductive film layer, a metal wire mesh layer positioned on one side of the second adhesive layer, which is far away from the base material, and a single-side adhesive layer positioned on one side of the metal wire mesh layer, which is far away from the second adhesive layer;

or the touch screen comprises a cover plate, a first adhesive layer positioned on one side of the cover plate, a base material positioned on one side of the first adhesive layer away from the cover plate, the patterned transparent conductive film layer positioned on one side of the base material away from the first adhesive layer, a second adhesive layer positioned on one side of the patterned transparent conductive film layer away from the base material, a metal wire mesh layer positioned on one side of the second adhesive layer away from the base material, and a single-sided adhesive layer positioned on one side of the metal wire mesh layer away from the second adhesive layer;

or the touch screen comprises a cover plate, an adhesive layer positioned on one side of the cover plate, a patterned transparent conductive film layer positioned on one side of the adhesive layer, which is far away from the cover plate, a base material positioned on one side of the patterned transparent conductive film layer, which is far away from the adhesive layer, a metal wire mesh layer positioned on one side of the base material, which is far away from the patterned transparent conductive film layer, and a single-side adhesive layer positioned on one side of the metal wire mesh layer, which is far away from the base material;

or the touch screen comprises a cover plate, a first adhesive layer positioned on one side of the cover plate, a base material positioned on one side of the first adhesive layer, which is far away from the cover plate, the patterned transparent conductive film layer positioned on one side of the base material, which is far away from the first adhesive layer, a metal wire mesh layer positioned on one side of the patterned transparent conductive film layer, which is far away from the base material, and a single-side adhesive layer positioned on one side of the metal wire mesh layer, which is far away from the patterned transparent conductive film layer; the metal wire mesh layer is formed by enameled wires and used for forming the second touch electrode.

Compared with the prior art, the beneficial effects of the utility model reside in that: in the touch screen of the present invention, the first touch electrode layer is a patterned transparent conductive film layer, and the second touch electrode layer is a metal wire mesh layer; compared with a touch screen with two metal wire mesh layers, the touch screen has the advantages that the capacitance values of the two touch electrode layers are increased, the anti-interference capability is enhanced, the wire diameter of the metal wires can be further reduced, and the capacitance value between the two wires cannot be greatly influenced.

Drawings

Fig. 1 is a schematic structural diagram of a touch screen according to a preferred embodiment of the present invention;

fig. 2 is a schematic structural diagram of a touch screen according to another preferred embodiment of the present invention;

fig. 3 is a schematic structural diagram of a touch screen according to another preferred embodiment of the present invention;

fig. 4 is a schematic structural diagram of a touch screen according to another preferred embodiment of the present invention;

fig. 5 is a schematic structural diagram of a touch screen according to another preferred embodiment of the present invention;

fig. 6 is a schematic structural diagram of a touch screen according to another preferred embodiment of the present invention;

fig. 7 is a schematic structural diagram of a touch screen according to another preferred embodiment of the present invention;

fig. 8 is a schematic structural diagram of a touch panel according to another preferred embodiment of the present invention;

fig. 9 is a schematic structural diagram of a touch screen according to another preferred embodiment of the present invention;

fig. 10 is a schematic view of a patterned transparent conductive electrode according to a preferred embodiment of the present invention;

fig. 11 is a schematic view of a patterned transparent conductive electrode in accordance with yet another preferred embodiment of the present invention;

fig. 12 is a schematic diagram of a second touch electrode formed by a metal wire or an enameled wire according to the present invention;

FIG. 13 is a schematic view of a wire grid in accordance with a preferred embodiment of the present invention;

FIG. 14 is a schematic view of a wire grid in accordance with another preferred embodiment of the present invention;

fig. 15 is a top view of the first touch electrode layer and the second touch electrode layer after being combined, which only illustrates the first touch electrode and the second touch electrode.

100-a touch screen, 1-a first touch electrode layer, 11-a first touch electrode, 2-a second touch electrode layer, 21-a second touch electrode, 22-a metal wire or an enameled wire, and 3-a cover plate.

Detailed Description

The present application will now be described in detail with reference to specific embodiments thereof as illustrated in the accompanying drawings. These embodiments are not intended to limit the present application, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present application.

In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.

Referring to fig. 1 to 15, a touch panel 100 according to a preferred embodiment of the present invention includes a first touch electrode layer 1, a second touch electrode layer 2, and an insulating layer located between the first touch electrode layer 1 and the second touch electrode layer 2. One of the first touch electrode layer 1 and the second touch electrode layer 2 serves as a driving layer of the touch screen 100, and the other serves as a receiving layer of the touch screen 100.

The first touch electrode layer 1 is a patterned transparent conductive film layer, the second touch electrode layer 2 is a metal wire mesh layer, and the metal wire mesh layer includes a second touch electrode 21 formed by metal wires 22 or enameled wires 22. Compared with the touch screen 100 with two metal wire mesh layers, the capacitance of the two touch electrode layers is increased, the anti-interference capability is enhanced, the wire diameter of the metal wire 22 or the enameled wire 22 can be further reduced, and the capacitance between the two wires cannot be greatly influenced.

In particular, according to C ═ KR²When the wire diameter of the metal wire 22 or the enameled wire 22 is reduced from 20 μm to 10 μm, the capacitance value is reduced to 0.25, which is more susceptible to interference; when the combination of the patterned transparent conductive film layer and the metal wire mesh layer is used, C ═ KLR due to the fact that the length L of the overlap is in mmThe capacitance value generated by the method is more than 100 times of that of the original method, and the anti-interference capacity is stronger; the requirements of a zero-laminating or full-laminating touch screen can be met; meanwhile, the wire diameter of the metal wire 22 or the enameled wire 22 can be further reduced, and the touch screen 100 has a better effect compared with the conventional touch screen 100 with a full metal wire mesh layer.

Specifically, the transparent conductive film layer is a nano metal layer, an ITO layer, a carbon nanotube layer, a graphene layer, or a nano-imprinted metal mesh layer. That is, the first touch electrode layer 1 is formed by a patterned circuit made of transparent conductive films such as nano metal, ITO, carbon nanotubes, graphene, or nano-imprinted metal grids; the patterned circuit is insulated by spacing or interposing insulating structures.

The nano metal layer comprises a nano metal wire, a nano metal rod or a nano metal film. In a specific embodiment, the nano metal wire is a nano silver wire, and in a preferred embodiment, the nano silver wire has a diameter of 5nm to 100nm and a length of 15 μm to 25 μm.

The preparation method of the transparent conductive film layer includes but is not limited to the following steps:

taking nano metal wires, nano metal rods, carbon nanotubes and graphene as examples, the nano metal wires, the nano metal rods, the carbon nanotubes and the graphene can be coated on the surface of a substrate in a solution form to form a continuous conductive film layer, and then a patterned transparent conductive film layer is formed through an etching process; the coating process includes, but is not limited to, the use of high precision slot extrusion coating equipment. Or, directly forming a patterned transparent conductive film layer by means of screen printing or ink-jet printing.

Taking nano metal film and ITO as an example, a patterned transparent conductive film layer is directly formed on a substrate by means of a mask through magnetron sputtering, vacuum evaporation and the like.

Further, as shown in fig. 10 and 11, the first touch electrode 11 on the first touch electrode layer 1 is in a serial structure, for example, an arc-shaped serial structure shown in fig. 10 or a diamond-shaped serial structure shown in fig. 11, and the overlapping area with the second touch electrode layer 2 is as large as possible.

In the metal wire mesh layer, preferably, an enameled wire 22 forms the second touch electrode 21. The enameled wire 22 comprises a metal wire core and an enameled coating coated outside the metal wire core, insulation between the metal wire core and the metal wire core can be achieved without additionally coating an insulating glue layer, an enameled wire group with a small wire distance is formed, even the enameled wire 22 can be directly overlapped together, and the distance between the enameled wires 22 can be reduced to 0. The metal core wire can be completely wrapped by the paint coating, or the metal core wire can be wrapped only by the part needing to be insulated by the enameled wire; for example, when an enameled wire is printed on a glue line, the side of the enameled wire facing the glue line is a bare metal core wire, and the part of the enameled wire which is not covered by the glue line is covered by a paint coating.

Further, as shown in fig. 12, the metal wire 22 or the enameled wire 22 is in a reciprocating manner, that is, the metal wire or the enameled wire 22 is extended to one end of the touch screen and then returns to the other end. As shown in fig. 13 and 14, the metal wire or enamel wire 22 is integrally in a serial structure, such as an arc-shaped serial structure or a diamond-shaped serial structure.

In addition, the metal wires 22 or the enameled wires 22 are uniformly distributed to achieve the effects of visual shadow elimination and orientation elimination.

The insulating layer is not limited in material, and can be a special transparent resin layer as long as the insulating effect can be achieved; the touch panel may also be formed by an adhesive layer used for bonding the first touch electrode layer 1 and the second touch electrode layer 2; when the second touch electrode is formed by an enameled wire, the enameled jacket can also serve as the insulating layer.

In addition, the first touch electrode layer 1 and the second touch electrode 21 are both located in a visible area of the touch screen 100, the touch screen 100 further includes an electrode lead located in a routing area around the visible area, and the electrode lead extends to a binding area of the touch screen 100 and is bound with the FPC.

The electrode leads include first electrode leads electrically connected to the first touch electrodes 11 of the first touch electrode layer 1 in a one-to-one correspondence, and second electrode leads electrically connected to the second touch electrodes 21 of the second touch electrode layer 2 in a one-to-one correspondence.

In a specific embodiment, the first electrode lead is a metal wire or an enameled wire, preferably, the enameled wire includes a metal wire core and an enameled sheath covering the metal wire core, and the insulation between the metal wire and the metal wire can be realized without additionally coating an insulating adhesive layer, so as to form an enameled wire group with a small wire pitch, and even the enameled wires can be directly overlapped together, that is, the pitch between the enameled wires can be reduced to 0, so that the width of the wire running area can be reduced. At this time, the enameled wire includes the overlapping portion that the metal wire outwards exposes, be convenient for with corresponding touch electrode electric connection.

Preferably, the metal wire or the enameled wire and the second touch electrode layer 2 are located on the same layer, and can be wired at the same time. When the insulating layer is a complete film structure located between the first touch electrode layer 1 and the second touch electrode layer 2, conductive holes corresponding to the first touch electrodes 11 one to one are formed in the insulating layer, the first touch electrodes 11 and the first electrode leads are electrically connected at the conductive holes, and the electrical connection mode includes, but is not limited to, filling conductive glue or conductive slurry in the conductive holes to electrically connect the conductive holes; or when the insulating layer is thinner, the insulating layer is directly pressed at the position to realize electric connection.

In another embodiment, the first electrode lead is an electrode line formed by conductive paste, and the electrode line may be formed by curing the conductive paste such as silver paste printed by screen printing or inkjet printing, or formed by coating the conductive paste such as silver paste into a conductive film and then etching the conductive film. Preferably, the electrode lines and the first touch electrode layer 1 are located in the same layer, and may be formed simultaneously or in steps.

The second electrode lead is an extension of the metal wire 22 or the enameled wire 22 constituting the second touch electrode, that is, the second electrode lead is directly formed by extending the metal wire 22 or the enameled wire 22, and an electrode lead does not need to be additionally arranged.

The touch screen 100 further includes a transparent cover plate 3, wherein the cover plate 3 includes, but is not limited to, glass, plastic plate, and transparent film, and the transparent film includes, but is not limited to, PET film.

The cover plate 3 is located on a side of the first touch electrode layer 1 away from the insulating layer, and generally, the first touch electrode layer 1 is attached to the cover plate 3 through an adhesive layer; of course, the first touch electrode layer 1 may also be directly formed on the cover plate 3. Or, the cover plate 3 is located on a side of the second touch electrode layer 2 departing from the insulating layer, in general, the second touch electrode layer 2 is attached to the cover plate 3 through an adhesive layer, and of course, the second touch electrode layer 2 may also be directly formed on the cover plate 3.

Hereinafter, the structure of the touch screen 100 and the manufacturing method thereof will be described in detail with some specific embodiments.

As shown in fig. 1, in an embodiment, the touch screen 100 includes a cover plate 3, a first adhesive layer located on one side of the cover plate 3, a metal wire mesh layer located on one side of the first adhesive layer facing away from the cover plate 3, a second adhesive layer located on one side of the metal wire mesh layer facing away from the adhesive layer, a patterned transparent conductive film layer located on one side of the second adhesive layer facing away from the metal wire mesh layer, and a substrate located on one side of the patterned transparent conductive film layer facing away from the second adhesive layer. The substrate is a substrate on which the patterned transparent conductive film layer is directly formed, and the second adhesive layer constitutes the insulating layer. The first adhesive layer plays a role in eliminating shadows for the metal wires of the metal wire mesh layer, and the visual effect is good.

As shown in fig. 2, in another embodiment, the touch screen 100 includes a cover plate 3, a first adhesive layer located on one side of the cover plate 3, a metal wire mesh layer located on one side of the first adhesive layer facing away from the cover plate, a second adhesive layer located on one side of the metal wire mesh layer facing away from the adhesive layer, a substrate located on one side of the second adhesive layer facing away from the metal wire mesh layer, and the patterned transparent conductive film layer located on one side of the substrate facing away from the second adhesive layer.

As shown in fig. 3, in another embodiment, the touch screen 100 includes a cover plate 3, a metal wire mesh layer located on one side of the cover plate 3, an adhesive layer located on one side of the metal wire mesh layer facing away from the cover plate 3, a substrate located on one side of the adhesive layer facing away from the metal wire mesh layer, and a patterned transparent conductive film layer located on one side of the substrate facing away from the adhesive layer. The substrate is a spare substrate for forming the patterned transparent conductive film layer, and the adhesive layer and the substrate jointly form the insulating layer. Or the glue layer and the base material are PET single-sided glue films, and the patterned transparent conductive film layer is positioned on the glue-free surface of the PET single-sided glue film. The adhesive layer and the base material are arranged integrally or are two independent film layers; the integrated arrangement means that the base material is a single-sided adhesive layer, and the patterned transparent conductive film layer is positioned on the adhesive-free surface of the base material.

As shown in fig. 4, in another embodiment, the touch screen 100 includes a cover plate 3, a metal wire mesh layer located on one side of the cover plate 3, an adhesive layer located on one side of the metal wire mesh layer facing away from the cover plate, a patterned transparent conductive film layer located on one side of the adhesive layer facing away from the metal wire mesh layer, and a substrate located on one side of the patterned transparent conductive film layer facing away from the adhesive layer. The substrate is a spare substrate for forming the patterned transparent conductive film layer, and the adhesive layer forms the insulating layer. In the preparation process, the metal wires or the enameled wires 22 are printed on the adhesive layer to form the metal wire grid layer, the metal wires or the enameled wires 22 are partially embedded into the adhesive layer, and the cover plate 3 is bonded with the adhesive layer when being bonded.

As shown in fig. 5, in another embodiment, the obtained touch screen 100 structure includes a cover plate 3, an adhesive layer located on one side of the cover plate 3, a metal wire mesh layer located on one side of the adhesive layer away from the cover plate 3, a patterned transparent conductive film layer located on one side of the metal wire mesh layer away from the adhesive layer, and a substrate located on one side of the patterned transparent conductive film layer away from the metal wire mesh layer. The base material is a spare base material for forming the patterned transparent conductive film layer, the metal wire mesh grid layer is formed by an enameled wire, and the enameled skin of the enameled wire forms the insulating layer. The substrate is a spare substrate for forming the patterned transparent conductive film layer, and the adhesive layer and the substrate jointly form the insulating layer.

The first adhesive layer in the embodiment of fig. 1 and 2 and the adhesive layer in fig. 5 have a function of eliminating the metal wires of the metal wire mesh layer, and have a good visual effect.

As shown in fig. 6, in another embodiment, the touch screen 100 includes a cover plate 3, a first adhesive layer located on one side of the cover plate 3, a patterned transparent conductive film layer located on one side of the first adhesive layer facing away from the cover plate 3, a substrate located on one side of the patterned transparent conductive film layer facing away from the adhesive layer, a second adhesive layer located on one side of the substrate facing away from the patterned transparent conductive film layer, a metal wire mesh layer located on one side of the second adhesive layer facing away from the substrate, and a single-sided adhesive layer located on one side of the metal wire mesh layer facing away from the second adhesive layer. The substrate is a spare substrate for forming the patterned transparent conductive film layer, and the substrate and the second adhesive layer jointly form the insulating layer. The second glue layer and the base material are arranged integrally or are two independent film layers. The second adhesive layer plays a role in eliminating shadows for the metal wires of the metal wire mesh layer, and the visual effect is good.

As shown in fig. 7, in another embodiment, the touch screen 100 includes a cover plate 3, a first adhesive layer located on one side of the cover plate 3, a substrate located on one side of the first adhesive layer facing away from the cover plate, the patterned transparent conductive film layer located on one side of the substrate facing away from the first adhesive layer, a second adhesive layer located on one side of the patterned transparent conductive film layer facing away from the substrate, a metal wire mesh layer located on one side of the second adhesive layer facing away from the substrate, and a single-sided adhesive layer located on one side of the metal wire mesh layer facing away from the second adhesive layer. The substrate is a spare substrate for forming the patterned transparent conductive film layer, and the second adhesive layer forms the insulating layer. The first glue layer and the base material are arranged integrally or are two independent film layers.

The second adhesive layer in fig. 6 and 7 has a function of eliminating the metal wires of the metal wire mesh layer, and the visual effect is good.

As shown in fig. 8, in another embodiment, the touch screen 100 includes a cover plate 3, an adhesive layer located on one side of the cover plate 3, a patterned transparent conductive film layer located on one side of the adhesive layer facing away from the cover plate, a substrate located on one side of the patterned transparent conductive film layer facing away from the adhesive layer, a metal wire mesh layer located on one side of the substrate facing away from the patterned transparent conductive film layer, and a single-sided adhesive layer located on one side of the metal wire mesh layer facing away from the substrate. The substrate is a spare substrate for forming the patterned transparent conductive film layer, and the substrate constitutes the insulating layer. In the preparation process, the metal wire or the enameled wire 22 is printed on the single-side adhesive layer to form the metal wire grid layer, and part of the metal wire or the enameled wire 22 is embedded into the adhesive layer and is bonded with the adhesive layer during bonding.

As shown in fig. 9, in another embodiment, the touch screen 100 includes a cover plate 3, a first adhesive layer located on one side of the cover plate 3, a substrate located on one side of the first adhesive layer facing away from the cover plate, the patterned transparent conductive film layer located on one side of the substrate facing away from the first adhesive layer, a metal wire mesh layer located on one side of the patterned transparent conductive film layer facing away from the substrate, and a single-sided adhesive layer located on one side of the metal wire mesh layer facing away from the patterned transparent conductive film layer; the metal wire mesh layer is formed by an enameled wire 22 to form the second touch electrode 21, and an enameled layer of the enameled wire forms the insulating layer. The first glue layer and the base material are arranged integrally or in two layers, the base material is a standby base material when the patterned transparent conductive film layer is formed, and the base material forms the insulating layer.

The glue layer in the above embodiments may be selected from an OCA glue film, a double-sided glue and a single-sided glue according to the position and the bonding requirement thereof. When the second touch electrode 21 is formed by using the enameled wire 22, the enamel coating of the enameled wire 22 also forms the insulating layer.

A preparation method of a reference touch screen comprises the following steps: s1, coating a nano silver wire on the surface of the PET hardened film to form a nano silver wire conductive film, and printing a silver paste lapping block in a wire routing area; s2 laser film etches the nanometer silver line conductive film to form a patterned circuit, which is used as one of the receiving layer circuit or the emitting layer circuit; s3, adhering a pressure-sensitive adhesive layer on the patterned circuit, and printing 20-micrometer enameled copper wires to form the other of the receiving layer circuit or the emitting layer circuit and the frame wiring; s4 is a silver paste connecting block electrically connecting the frame trace and the silver nanowire layer according to the method of patent document 201920715526.6 in china; and S5, attaching the cover plate 3 to obtain the touch screen 100.

The preparation method of the other reference touch screen comprises the following steps: s1, coating a nano silver wire on the single-sided PET adhesive film without an adhesive surface and corona to form a nano silver wire conductive film; s2, etching the nano silver wire conductive film to form an emitting layer circuit; s3, uncovering the OCA adhesive film light release surface to print an enameled wire, and stripping the enameled layer corresponding to the overlapping region position of the emitting layer by using laser; s4 is compounded on the surface of the nano silver wire conducting film of S1 or the glue surface of the single-sided PET glue film, and silver paste is conducted to form the touch screen consisting of the nano silver wires and the enameled wires; and S5, attaching the cover plate 3 to obtain a finished product.

The preparation method of the other reference touch screen comprises the following steps: s1, coating a nano silver wire on the single-sided PET adhesive film without an adhesive surface and corona to form a nano silver wire conductive film; s2, printing frame silver paste, drying and curing, performing laser etching to form a circuit and a frame lead, and binding a corresponding FPC (flexible printed circuit) by using ACF (anisotropic conductive film) glue; s3, uncovering a release film on a light release surface of the OCA adhesive film, directly printing to form a circuit and a frame lead of a receiving layer window area, and laser welding the FPC; and S4, compounding the circuit obtained in the step S3 to the surface of the conductive film of the step S2 or the glue surface of the single-sided PET glue film, and attaching the cover plate 3 to obtain the capacitive touch screen.

To sum up, in the touch screen 100 of the present invention, the first touch electrode layer 1 is a patterned transparent conductive film layer, and the second touch electrode layer 2 is a metal wire mesh grid layer; compared with the touch screen 100 with two metal wire mesh layers, the capacitance of the two touch electrode layers is increased, the anti-interference capability is enhanced, the wire diameter of the metal wires can be further reduced, and the capacitance between the two wires cannot be greatly influenced.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above list of details is only for the feasible embodiments of the present invention, and is not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present invention are intended to be included within the scope of the present invention.

Claims

1. A touch screen comprises a first touch electrode layer, a second touch electrode layer and an insulating layer positioned between the first touch electrode layer and the second touch electrode layer, and is characterized in that: the first touch electrode layer is a patterned transparent conductive film layer, the second touch electrode layer is a patterned metal wire mesh layer, and the metal wire mesh layer comprises a second touch electrode formed by metal wires or enameled wires.

2. The touch screen of claim 1, wherein the transparent conductive film layer is a nano metal layer, an ITO layer, a carbon nanotube layer, a graphene layer, or a nano-imprinted metal mesh layer.

3. The touch screen of claim 2, wherein the nano-metal layer comprises nano-metal wires, or nano-metal rods, or nano-metal films.

4. The touch screen of claim 1, further comprising first electrode leads in one-to-one correspondence with the first touch electrodes of the first touch electrode layer, wherein the first electrode leads are metal wires or enameled wires, and the enameled wires comprise lap joint portions where inner metal wire cores are exposed outwards to be electrically connected with the first touch electrodes; or the first electrode lead is an electrode wire formed by conductive paste.

5. The touch screen of claim 4, wherein when the first electrode lead is a metal wire or an enameled wire, the metal wire or the enameled wire and the second touch electrode layer are located on the same layer.

6. The touch screen of claim 5, wherein the insulating layer is a complete film structure located between the first touch electrode layer and the second touch electrode layer, conductive holes corresponding to the first touch electrodes one to one are formed in the insulating layer, and the first touch electrodes and the first electrode leads are electrically connected at the conductive holes.

7. The touch screen of claim 1, further comprising second electrode leads in one-to-one correspondence with the second touch electrodes, wherein the second electrode leads are extensions of metal wires or enameled wires constituting the second touch electrodes.

8. The touch screen of claim 1, wherein the touch electrodes of the first touch electrode layer are in an arc-shaped series structure or a diamond-shaped series structure;

9. The touch screen of claim 1, further comprising a cover plate, wherein the cover plate is located on a side of the first touch electrode layer facing away from the insulating layer, or the cover plate is located on a side of the second touch electrode layer facing away from the insulating layer.

10. Touch screen according to claim 1,

the touch screen comprises a cover plate, a first adhesive layer positioned on one side of the cover plate, a metal wire mesh layer positioned on one side of the first adhesive layer, which is far away from the cover plate, a second adhesive layer positioned on one side of the metal wire mesh layer, which is far away from the adhesive layer, a patterned transparent conductive film layer positioned on one side of the second adhesive layer, which is far away from the metal wire mesh layer, and a base material positioned on one side of the patterned transparent conductive film layer, which is far away from the second adhesive layer;