CN114489361B - Conductive electrode and touch screen with same - Google Patents

Conductive electrode and touch screen with same Download PDF

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Publication number
CN114489361B
CN114489361B CN202011149780.8A CN202011149780A CN114489361B CN 114489361 B CN114489361 B CN 114489361B CN 202011149780 A CN202011149780 A CN 202011149780A CN 114489361 B CN114489361 B CN 114489361B
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China
Prior art keywords
metal
wire
metal core
core wire
wires
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CN114489361A (en
Inventor
雷贝
刘大虎
孙敏轩
李增成
鲁亮
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Suzhou Huige Photoelectric Technology Co ltd
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Suzhou Huige Photoelectric Technology Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04112—Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • Manufacturing Of Printed Wiring (AREA)

Abstract

The invention relates to a conductive electrode and a touch screen with the same, wherein the conductive electrode comprises a substrate and an electrode circuit positioned on the substrate, the electrode circuit comprises metal wires which are arranged in a pattern mode, each metal wire comprises a metal core wire and a transparent coating layer coated outside the metal core wire, and the wire diameter of each metal core wire is not more than 9 mu m. According to the invention, the coating layer is arranged outside the metal core wire, so that the strength of the metal wire can be improved under the condition that the wire diameter of the metal core wire is smaller, the tensile strength of the metal wire is not smaller than 0.01N, the strength requirement of the printing equipment on wires is met, the wire can be automatically printed by the 3D printing equipment, and the product yield is greatly improved.

Description

Conductive electrode and touch screen with same
Technical Field
The invention relates to the field of conductive electrodes, in particular to a conductive electrode and a touch screen with the same.
Background
In the existing metal grid touch screen, a metal wire, or a photoetching metal thin wire, or silver paste is used as an electrode line to form an emitting layer or a receiving layer.
At present, copper wires with 12 μm are generally adopted as metal wires of a metal grid layer, and the requirements of higher-speed and more-precision communication equipment and the like at present and in the future cannot be met.
In view of the foregoing, it is necessary to provide a conductive electrode and a touch screen having the same.
Disclosure of Invention
The invention aims to provide a conductive electrode and a touch screen with the same.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a conductive electrode, comprising:
a substrate;
the electrode circuit is positioned on the substrate and comprises metal wires which are arranged in a pattern mode, wherein each metal wire comprises a metal core wire and a transparent coating layer which is coated outside the metal core wire, and the wire diameter of each metal core wire is not more than 9 mu m.
A conductive electrode, comprising:
a substrate;
an electrode line on the substrate, the electrode line including a metal wire arranged in a pattern, the metal wire including only a metal core wire; or the metal wire positioned in the window area comprises a metal core wire, and the metal wire outside the window area comprises a metal core wire and a transparent coating layer coated outside the metal core wire; the wire diameter of the metal core wire is not more than 9 mu m.
Further, the metal core wire has a single-layer structure;
or, the metal core wire comprises a metal core wire and at least one metal shell layer coated outside the metal core wire.
Further, the metal shell layer includes a blackened layer.
Further, the thickness of the metal shell layer is not less than 1nm.
Further, the section of the metal core wire is round, oval or rectangular.
Further, the wire diameter of the metal core wire is unchanged along the axial direction of the metal core wire; or, at least part of the metal core wire has a wire diameter different from that of other parts along the axial direction of the metal core wire.
Further, preferably, the wire diameter of the metal core wire is between 0.1 μm and 9 μm; the wire diameter of the metal core wire is not more than 5 mu m; preferably, the wire diameter of the metal core wire is between 0.1 and 5 mu m;
and/or the thickness of the coating layer is between 2 mu m and 100 mu m; preferably, the thickness of the coating layer is not less than 5 μm; preferably, the thickness of the coating layer is not more than 50 μm.
Further, the thickness difference of different parts on the coating layer is not more than 1 mu m.
Further, the coating layer of the metal wire in the lap joint area of the electrode circuit is provided with a through hole and an electric connecting piece in the through hole, and the conductive electrode further comprises an FPC electrically connected with the metal core wire through the electric connecting piece or comprises a frame wiring electrically connected with the metal core wire through the electric connecting piece.
Further, the metal wire only comprises a metal core wire, and the conductive electrode further comprises an FPC electrically connected with the metal core wire positioned in the lap joint area of the electrode circuit or a frame wire electrically connected with the metal core wire of the metal wire positioned in the lap joint area of the electrode circuit.
A touch screen comprising any one of the conductive electrodes described above.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the coating layer is arranged outside the metal core wire, so that the strength of the metal wire is improved, the wire diameter of the metal core wire is reduced to 9 mu m, and the revolutionary development is brought to the development of the communication field.
Drawings
FIG. 1 is a schematic cross-sectional view of a metal wire according to a preferred embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a metal wire according to another preferred embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a metal wire according to another preferred embodiment of the present invention;
fig. 4 is a schematic structural view of a touch screen according to a preferred embodiment of the present invention.
100-metal wires, 1-metal core wires, 11-metal core wires, 12-metal shell layers, 2-coating layers and 200-touch screen.
Detailed Description
The present application will be described in detail with reference to the following detailed description of the embodiments shown in the drawings. However, these embodiments are not intended to limit the present application, and structural, methodological, or functional modifications made by one of ordinary skill in the art based on these embodiments are included within 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 convenience of illustration, and thus serve only to illustrate the basic structure of the subject matter of the present application.
Referring to fig. 1 to 3, the present invention provides a method for preparing a conductive electrode, which includes the following steps: the electrode circuit is formed by printing a metal wire 100 on a substrate with an adhesive layer, the metal wire 100 comprises a metal core wire 1 and a coating layer 2 coated outside the metal core wire 1, and the tensile strength of the metal wire 100 is greater than 0.01N.
Through set up cladding 2 outside metal core 1, also can improve the intensity of metal wire 100 under the less circumstances of metal core 1 wire footpath, make its tensile strength be not less than 0.01N, satisfied the printing equipment and to the intensity requirement of line, the accessible 3D printing equipment is printed automatically and is accomplished, has improved the product yield greatly.
Wherein, the metal core wire 1 is a key structure for signal transmission.
In one class of embodiments, the metal core 1 is a single metal layer, and the metal core 1 is selected from magnesium and its alloy, aluminum and its alloy, zinc and its alloy, iron and its alloy, nickel and its alloy, tin and its alloy, lead and its alloy, copper and its alloy, silver and its alloy, tungsten and its alloy, molybdenum and its alloy, gold and its alloy, platinum and its alloy, or palladium and its alloy.
Preferably, the metal core wire 1 is made of inert metal and alloy thereof, which is not easy to oxidize or corrode in the manufacturing process and the subsequent use process, and has long service life. For example: nickel and its alloys, or copper and its alloys, or tungsten and its alloys, or gold and its alloys, or silver and its alloys, or platinum and its alloys, or palladium and its alloys.
In another class of embodiments, the metal core wire 1 includes a metal core wire 11 and at least one metal shell layer 12 coated outside the metal core wire 11, and may be obtained by, but not limited to, a composite multilayer metal drawing method and a sandwich wire melt drawing method.
Preferably, the chemical activity decreases from inside to outside in the radial direction of the metal wire 100, which is advantageous for protecting the inner layer wire.
For example, the metal core wire 1 has a double-layer structure, the chemical activity of the metal shell layer 12 is lower than that of the metal core wire 11, that is, the metal core wire 1 is formed by coating common metal with inert metal, so that the metal core wire 11 positioned inside is protected from oxidation or corrosion, the selection range of the metal core wire 11 is enlarged, the amount of expensive and scarce metal is reduced to a certain extent, and the cost is reduced.
The metal core wire 1 is selected from gold-coated copper, platinum-coated copper, silver-coated copper, palladium-coated copper, gold-coated silver, or platinum-coated silver.
Alternatively, the metal core wire 1 has at least a three-layer structure, and is different from the two-layer structure in that: the metal core wire 1 comprises at least two layers of the metal shell layer 12. The chemical activity of the metal shell 12 on the outer side is lower than that of the metal shell 12 on the inner side.
For example, the metal core wire 1 has a three-layer structure selected from, but not limited to, palladium-clad copper or silver-clad copper.
Preferably, the thickness of the metal shell layer 12 is not less than 1nm, so as to ensure the effective integrity of the film layer, and effectively protect the inner core layer metal.
The method also comprises the step of blackening the metal shell, wherein a blackening agent is optionally added to blacken the metal shell. In one embodiment, when the metal shell is a silver layer, the blackening treatment agent includes, but is not limited to, sodium hypochlorite solution, or sodium perchlorate solution, sodium thiosulfate solution, or linear alkyl mercapto alcohol.
In addition, the cross section of the metal core wire is circular, oval or rectangular, and it will be understood by those skilled in the art that the metal wire formed by coating the coating material with the core material having different shapes is not a gauge moment and may be slightly deformed. The circle includes an approximate circle, the ellipse includes an approximate ellipse, and the rectangle includes an approximate rectangle.
When the conductive electrodes formed by the metal core wires with rectangular and elliptic cross sections are used for forming the touch screen, the cross area of the metal wires between the two layers of conductive electrodes is large, and the capacitance value is large.
And the wire diameter of the metal core wire is unchanged along the axial direction of the metal core wire. Or, along the axial direction of the metal core wire, the wire diameter of the metal core wire can be changed according to actual needs, and at least part of the wire diameter of the metal core wire is different from the wire diameters of other parts. For example, the metal core wire in the window area has a smaller wire diameter, the metal core wire in the FPC binding area has a larger wire diameter, the metal core wire in the frame routing area has a larger wire diameter or a smaller wire diameter, and the frame can be made narrower when the metal core wire is smaller.
The wire diameter of the metal core wire 1 is not more than 9 mu m; preferably not more than 5 μm, electrode lines of 5 μm or less can be obtained; preferably, the wire diameter of the metal core wire 1 is between 0.1 μm and 9 μm, more preferably between 0.1 μm and 5 μm; the metal core wire 1 is effectively prevented from being broken during the production and use process. The wire diameter represents the thickness of the metal core wire, and can be calculated in two ways: the distance between the two farthest points on the section of the metal core wire; or equivalent the cross-sectional area of the metal core wire to the area of a circle, the diameter of which is the wire diameter.
The coating layer 2 protects and improves the strength of the metal core wire 1.
The coating layer 2 is a non-metal coating layer 2, and the non-metal coating layer 2 is selected from silicon, glass, metal oxide, ionic crystal or transparent polymer. The nonmetallic coating 2 may be combined with any one of the metallic core wires 1 to construct the metallic wire 100.
Or, the coating layer 2 is a metal coating layer 2, and the metal coating layer 2 is selected from copper, silver, iron or nickel.
Preferably, the chemical activity of the metal coating layer 2 is greater than that of the metal core wire 1, so that the metal coating layer 2 loses electrons earlier than the metal core wire 1 to generate chemical reaction under the same chemical environment, thereby effectively protecting the inner metal core wire 1. When the metal core wire 1 has a multilayer structure, the chemical activity of the metal coating layer 2 is greater than the chemical activity of the metal shell layer 12 of the outermost layer of the metal core wire 1.
The metal coating layer 2 may be combined with any one of the metal core wires 1 to form the metal wire 100. In one embodiment, the metal wire 100 formed by the metal cladding 2 and the metal core wire 1 with a single layer structure, for example, is formed by: copper-clad gold wire and silver-clad platinum wire. In another embodiment, the metal clad 2 and the metal core wire 1 of a double-layer structure form the metal wire 100, for example, the following: and (5) copper-clad gold-clad copper wires.
Further, the thickness difference of different parts on the coating layer 2 is not more than 1 μm, and the thickness difference of the whole coating layer 2 is smaller, so as to avoid insufficient local protection force and strength.
The thickness of the coating layer 2 is between 2 mu m and 100 mu m. Preferably, the thickness of the clad layer 2 is not less than 5 μm; preferably, the thickness of the coating layer 2 is not more than 50 μm. The metal core wire 1 of any wire diameter may be combined with the cladding layer 2 of any thickness to form the metal wire 100.
In a preferred embodiment, the thickness of the coating layer 2 is not smaller than the wire diameter of the metal core wire 1, and the metal wire 100 can be ensured to have sufficient tensile strength even if the wire diameter of the metal core wire 1 is small. For example: the wire diameter of the metal core wire 1 is between 0.1 and 5 mu m, and the thickness of the coating layer 2 is between 5 and 50 mu m; the requirements of the thin metal core wire 1 are satisfied and the strength of the metal wire 100 is also satisfied.
In addition, the coating layer 2 is transparent, and shadows can be eliminated in a plurality of film layers.
Preferably, when the conductive electrode layer is adhered to other conductive electrode layers, the refractive index of the coating layer 2 is close to or the same as that of the adjacent adhesive layer, and the shadow eliminating effect is better. For example, the refractive index of the cladding layer 2 is between 1 and 3, preferably 1.5; the haze of the clad layer 2 is not more than 10%, and a transparent conductive electrode can be formed.
Based on any one of the above preparation methods of the conductive electrode, it further comprises electrically connecting the electrode line with the FPC or the frame wire.
The connection mode with the frame wire comprises forming the frame wire on the substrate; removing the coating layer 2 of the lap joint area connected with the frame wire on the metal wire 100; and electrically connecting the metal core wire 1 with the frame wire.
The FPC typically includes a flexible circuit board, flexible flat cables, and tail flick structures. Removing the coating layer 2 of the lap joint area connected with the frame wire on the metal wire 100; and electrically connecting the metal core wire 1 with the FPC.
After the electrode circuit is formed by printing the metal wire, a protective layer is formed on the metal wire by coating resin or an adhesive layer, so that the position corresponding to the metal wire is punched by adopting the forms of laser punching and the like, the coating layer 2 is removed by means of solvent elution, laser ablation and solution cleaning, and the metal core wire exposed outwards on the metal wire is electrically connected with the FPC or the frame wire, wherein the electrical connection modes comprise but are not limited to welding, conductive adhesive connection, conductive paste solidification connection and embossing.
Hereinafter, an FPC will be described as an example. The FPC is a flexible flat cable or a custom connector. The golden finger of the FPC, which is a soft flat cable, means a PIN end, a tinned or gold-plated wire or a wire without treatment. The PIN end of the FPC soft flat cable and the FPC can be on two sides or one side. The FPC flexible flat cable can also be a complex formed by two wires, one section is of a metal wire structure and comprises FPC flat cables formed by other welding, namely a conventional traditional tail-flicking structure for pre-batch welding and measurement.
FPC flexible flat cable is transparent structure, is convenient for counterpoint. Or, the FPC flexible flat cable is of an opaque structure, so that visual observation in alignment is facilitated; or, the FPC includes a positioning hole or a positioning target.
The FPC and the metal wires can be connected through holes or blind holes. In one embodiment, each hole corresponds to a metal wire, the wire diameter of the hole is not more than 0.5mm, and the holes are insulated; or each hole corresponds to a plurality of metal wires, insulation is realized between adjacent metal wires through control of printing intervals, for example, all the coating layers 2 of the binding area are removed, the metal wires are attached to golden fingers of the FPC or the wires of the FPC in a one-to-one correspondence manner, and then the metal wires and the wires are electrically contacted in an embossing manner.
In the on position, the structural strength can be improved by the reinforcing structure, for example, the strength can be improved by attaching the reinforcing sheet to the back.
In addition, the preparation method of the conductive electrode further comprises removing the coating layer 2. This step may be selectively performed after printing the metal wire 100 according to the appearance requirements of the final touch screen or the like. The coating layer 2 is preferably removed by a chemical reaction or a solution so as not to damage the inner metal core wire 1.
And after the coating layer 2 is removed, directly attaching a frame wire or an FPC, and conducting to obtain a single-layer complete circuit.
Or in the printing process, the printing precision of the metal wire 100 is controlled, the proper spacing is kept, after the coating layer 2 is removed, the wires are densely arranged and mutually independent, and a single-layer complete circuit can be obtained.
A conductive electrode is prepared by any one of the preparation methods of the conductive electrode. The conductive electrode can be applied to solar cells, OLED devices, electromagnetic shields, transparent conductive heating films and the like.
The conductive electrode of the preferred embodiment of the invention comprises a substrate and an electrode circuit arranged on the substrate, wherein the electrode circuit comprises a metal wire 100 which is arranged in a pattern, the metal wire comprises a metal core wire 1 and a coating layer 2 coated outside the metal core wire 1, and the wire diameter of the metal core wire 1 is not more than 5 mu m. The structures of the metal core wire 1 and the cladding 2 are as described above, and will not be described in detail herein.
The coating layer 2 of the metal wire 100 in the lap joint area of the electrode line is provided with a through hole and an electric connecting piece in the through hole, and the conductive electrode further comprises an FPC electrically connected with the metal core wire through the electric connecting piece, or the conductive electrode further comprises a frame wiring electrically connected with the metal core wire through the electric connecting piece. Typically, the electrical connection is formed from an infused conductive paste.
The conductive electrode of the preferred embodiment of the invention comprises a substrate and an electrode circuit positioned on the substrate, wherein the electrode circuit comprises metal wires which are arranged in a pattern mode, the metal wires comprise metal core wires, and the wire diameter of the metal core wires is not more than 5 mu m. This embodiment is the conductive electrode structure after removing the cladding layer 2 in the above-described method.
Further, the conductive electrode further comprises an FPC electrically connected to the metal core wire 1 located in the lap joint area of the electrode circuit, or a frame trace electrically connected to the metal core wire of the metal wire 1 located in the lap joint area of the electrode circuit.
Referring to fig. 1 to 4, the present invention further provides a method for manufacturing a touch screen, including the following steps:
preparing an emission circuit layer by any one of the preparation methods of the conductive electrodes;
preparing a receiving circuit layer by any one of the preparation methods of the conductive electrodes;
and attaching the transmitting circuit layer and the receiving circuit layer which are independently and separately arranged.
The invention also provides a preparation method of the touch screen, which comprises the following steps: the transmitting circuit layer and the receiving circuit layer are prepared on the same layer on the substrate by the preparation method of any one of the conductive electrodes, and are positioned on the same layer at the moment and are arranged in an insulating and staggered mode.
The method for manufacturing the conductive electrode and the method for manufacturing the touch screen according to the present invention will be described in detail with specific examples.
Example 1: printing a glass-coated copper wire on a single-sided adhesive film of a PET substrate with the thickness of 75 mu m, wherein the outer diameter of the copper wire is 10 mu m, and the wire diameter of the copper wire is 3 mu m; printing to form a TX circuit layer and an RX circuit layer; and laser perforation is used at the channel end points of the TX circuit layer and the RX circuit layer to expose the glass cladding wires, HF acid is used to remove the glass cladding layer 2, so that copper wires at the joint are exposed outwards to form a bonding wire, and then the bonding wire is conducted and welded with the FPC.
Example 2: printing a glass-coated copper wire on a single-sided adhesive film of a PET substrate with the thickness of 75 mu m, wherein the outer diameter of the copper wire is 10 mu m, and the wire diameter of the copper wire is 3 mu m; printing to form a TX circuit layer and an RX circuit layer; exposing the glass cladding wires by using laser perforation at the channel end points of the TX circuit layer and the RX circuit layer, removing the glass cladding layer 2 by using HF acid, and exposing the copper wires at the joint to form a bonding wire; and (3) attaching a frame lead wire formed by an insulated metal wire, and conducting and welding silver paste.
Example 3: printing a glass-coated copper wire on a single-sided adhesive film of a PET substrate with the thickness of 75 mu m, wherein the outer diameter of the copper wire is 10 mu m, and the wire diameter of the copper wire is 1 mu m; printing to form a TX circuit layer and an RX circuit layer; attaching a frame lead wire formed by insulating metal wires, and conducting and welding silver paste; the copper wire is attached to a corresponding layer formed by conducting materials such as ITO or nano silver wire layers, and the problem that the capacitance value is too small caused by too thin copper wires is solved.
Example 4: printing a glass-coated copper wire on a single-sided adhesive film of a PET substrate with the thickness of 75 mu m, wherein the outer diameter of the copper wire is 10 mu m, and the wire diameter of the copper wire is 1 mu m; printing to form a TX circuit layer and an RX circuit layer; after UV glue is printed at the intersection position of the TX line and the RX line, hydrofluoric acid corrosion is carried out on the whole surface, and the glass coating layer 2 is removed, so that the influence of possible haze on the optical effect of the glass coating layer 2 can be avoided; and (3) attaching a frame lead wire formed by an insulated metal wire, and conducting and welding silver paste.
Example 5: printing a glass-coated copper wire on a single-sided adhesive film of a PET substrate with the thickness of 75 mu m, wherein the outer diameter of the copper wire is 8 mu m, and the wire diameter of the copper wire is 2 mu m; printing to form a TX circuit layer and an RX circuit layer, and etching the whole surface by using 3% of hydrofluoric acid by mass percent to remove the glass coating layer 2; respectively attaching frame leads formed by insulated metal wires, and conducting and welding silver paste; the TX line layer and the RX line layer are combined in a bonding manner or combined as in example 3.
Example 6: printing tungsten wires coated by polyurethane resin layers on a double-sided adhesive film of a PET (polyethylene terephthalate) substrate with the thickness of 75 mu m, wherein the outer diameter of the tungsten wires is 20 mu m, and the wire diameter of the tungsten wires is 3 mu m; printing to form a TX circuit layer and a frame lead thereof, or an RX circuit layer and a frame lead thereof; and removing the polymer layer at the tail-throwing position by using a laser perforation wire stripping, conducting the polymer layer with the FPC through silver paste to obtain a TX circuit or an RX circuit, and combining the TX circuit and the RX circuit which are made of any one or any other materials to obtain the touch screen.
Example 7: printing a copper-clad gold wire on a single-sided adhesive film of a PET (polyethylene terephthalate) substrate with the thickness of 75 mu m, wherein the outer diameter of the copper-clad gold wire is 10 mu m, the thickness of a copper wire layer is 4.5 mu m, and the wire diameter of the gold wire is 1 mu m; printing to form a TX circuit layer and an RX circuit layer respectively; removing the copper layer by using ferric trichloride solution or removing the copper layer of the alloy wire by using copper sulfate solution in an electrolysis way, and leaving the gold wire; attaching a copper wire frame, and welding and conducting; and finishing the lamination of the TX circuit and the RX circuit to obtain the touch screen.
Example 8: printing a copper-clad copper wire with the outer diameter of 10 mu m, the thickness of a copper wire layer of 4.5 mu m, the wire diameter of the copper wire with the gold wire of 1 mu m and the thickness of the gold layer of 0.1 mu m on a double-sided adhesive film of a PET substrate with the thickness of 75 mu m; printing a TX circuit layer or an RX circuit layer respectively; removing the copper layer by using ferric trichloride solution or removing the copper layer of the alloy wire by using copper sulfate solution in an electrolysis manner, and leaving a gold-clad copper metal core wire 1; and (3) attaching a copper wire frame, welding and conducting to form a TX circuit and an RX circuit, and completing the attachment of the TX circuit and the RX circuit to obtain the touch screen.
Example 9: printing a silver-coated platinum wire on a single-sided adhesive film of a PET substrate with the thickness of 75 mu m, wherein the outer diameter of the silver-coated platinum wire is 20 mu m, the thickness of a silver layer is 9 mu m, and the wire diameter of the platinum wire is 2 mu m; printing and forming a TX circuit layer and an RX circuit layer respectively by using a 3D printing device; using hydrogen peroxide and EDTA solution to dissolve and remove the silver layer of the alloy wire, and leaving a platinum wire; and (3) attaching a copper wire frame, conducting silver paste, and completing the attachment of the TX circuit and the RX circuit to obtain the touch screen.
Example 10: printing an aluminum alloy silver-coated copper wire on a single-sided adhesive film of a PET (polyethylene terephthalate) substrate with the thickness of 75 mu m, wherein the outer diameter of the aluminum alloy silver-coated copper wire is 30 mu m, the thickness of an aluminum layer is 13 mu m, silver is 0.5 mu m, and the wire diameter of a copper wire is 3 mu m; printing respectively by using 3D printing equipment to form a TX circuit layer and an RX circuit layer, wherein the circuit spacing is controlled during printing, and cross overlapping is not allowed; dissolving and removing the aluminum layer of the composite metal wire by using sodium hydroxide solution, and leaving a silver-coated copper wire layer;
the addition of the 6 sodium thiosulfate solution promotes the blackening of the silver layer in the window area, and the shadow eliminating effect is better. And finishing the lamination of the TX circuit and the RX circuit and welding the FPC to obtain the touch screen.
The manner in which the metal wire is soldered to the FPC will be described with emphasis below.
Example 11: the line-to-line conduction method includes, but is not limited to, the following:
11a) Aligning and attaching the FPC and the metal wire to enable the wire of the FPC to be aligned with the metal wire; forming a through hole by using staggered laser ablation or array ablation; and sticking a reinforcing sheet on the back, filling silver paste into holes or conducting the solder paste, and solidifying to form the welding.
11b) The metal wire is stripped through laser perforation; or stripping the base material by laser perforation to form a hole, and removing the coating layer by a chemical method; the wire of the FPC is stripped by using laser perforation; aligning and attaching the FPC and the metal wire, and aligning the positions of the holes of the FPC and the metal wire; and sticking a reinforcing sheet on the back, filling silver paste into holes or conducting the solder paste, and solidifying to form the welding.
11c) Laser perforation wire stripping is carried out on metal wires arranged in the multilayer film, or holes are formed by stripping the base material through laser perforation, and then a chemical method is used for removing the coating layer; wire stripping is carried out on wires with metal wire positions in a tail-flick mode (a metal wire array is printed on a glue film and an FPC is welded) by using laser perforation; aligning and attaching the metal wires in the tail flick and the printed metal wires (frames or metal grid touch screens), and aligning the positions of the holes of the metal wires and the printed metal wires; and sticking a reinforcing sheet on the back, filling silver paste into holes or conducting the solder paste, and solidifying to form the welding.
Example 12: the wire-to-golden finger conduction mode includes but is not limited to the following modes:
12a) The method comprises the following steps Aligning and attaching the FPC golden finger and the metal wire, so that the metal wire is aligned with the central position of the golden finger, and the attaching process can be performed by using glue or inapplicable glue, and the glue film and UV liquid glue can be used; forming blind holes by using staggered laser ablation or array ablation; at this time, the positions of the golden fingers are exposed to the metal wires; filling silver paste into holes or conducting tin paste, solidifying to form welding
12b) The method comprises the following steps Laser perforation wire stripping of metal wires; or stripping the base material by laser perforation to form a hole, and removing the coating layer by a chemical method; the golden finger position of the FPC is aligned with the copper wire conducting point position, and the golden finger is larger than the opening hole of the metal wire; filling silver paste into holes or conducting tin paste, solidifying to form welding
12c) The method comprises the following steps Laser perforation wire stripping of metal wires; or stripping the base material by laser perforation to form a hole, and removing the coating layer by a chemical method; bonding or brushing a glue layer on the golden finger position of the FPC; stripping part of the adhesive layer by using laser to form conducting points of the array; the metal wire conducting points are aligned with conducting points on the golden finger, and the area of the conducting points on the golden finger is slightly larger than that of the holes formed in the metal wire; filling silver paste into holes or conducting tin paste, solidifying to form welding
Embodiment 13 golden finger conduction by wire and flat cable includes, but is not limited to, the following:
13a are aligned and attached with the wires of the FPC and the metal wires, so that the metal wires are aligned with the central positions of the wires of the FPC, and the wires of the FPC are wider than the wires of the metal wires. Forming blind holes by using staggered laser ablation or array ablation; at this time, the positions of the golden fingers on the metal wires are exposed; and filling silver paste into the holes or conducting the solder paste, and solidifying to form the welding.
13b) The method comprises the following steps Laser perforation wire stripping of metal wires; or stripping the base material by laser perforation to form a hole, and removing the coating layer by a chemical method; the FPC winding displacement is adhered with pressure-sensitive adhesive or is coated with pressure-sensitive adhesive, when the copper wire surface is provided with an adhesive layer, the adhesive layer and the coating layer at the position of the conducting point can be removed by laser; aligning and attaching the wires of the FPC and the metal wires to align the metal wires with the central positions of the wires of the FPC; forming blind holes by using staggered laser ablation or array ablation, wherein the positions of the gold fingers on the copper wires are exposed; and filling silver paste into the holes or conducting the solder paste, and solidifying to form the welding.
Example 14: ACF welding
The metal wire is stripped through laser perforation; or stripping the base material by laser perforation to form a hole, and removing the coating layer by a chemical method; the reinforcing sheet is stuck on the back, and silver paste is poured into holes or solder paste is poured on the back to form conductive leading-out points which can resist hot pressure; and sticking ACF to FPC golden finger, and thermocompression bonding.
The preparation method of the touch screen further comprises a packaging process, for example, packaging is carried out by attaching a cover plate.
The invention also comprises a touch screen which is prepared by the preparation method of any one of the touch screens, or the touch screen comprises any one of the conductive electrodes.
The touch screen can be attached to a display screen for use, and has the following structure:
in summary, according to the invention, the coating layer 2 is arranged outside the metal core wire 1, so that the strength of the metal wire 100 can be improved under the condition that the wire diameter of the metal core wire 1 is smaller, the tensile strength of the metal wire is not smaller than 0.01N, the strength requirement of the printing equipment on wires is met, the wire can be automatically printed by the 3D printing equipment, and the product yield is greatly improved.
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical 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 spirit of the present invention should be included in the scope of the present invention.

Claims (15)

1. A conductive electrode, comprising:
a substrate;
the electrode circuit is positioned on the substrate and comprises metal wires which are arranged in a patterning way, the electrode circuit is a metal grid formed by the metal wires, the metal wires comprise metal core wires and transparent coating layers which are coated outside the metal core wires, and the wire diameter of the metal core wires is not more than 9 mu m; the tensile strength of the metal wire is more than 0.01N, so that the strength requirement of printing equipment on wires is met; the coating layer is a metal coating layer, and the chemical activity of the metal coating layer is larger than that of the metal core wire.
2. A conductive electrode, comprising:
a substrate;
the electrode circuit is positioned on the substrate and comprises metal wires which are arranged in a patterning way, the metal wires positioned in a window area comprise metal core wires, and the metal wires outside the window area comprise metal core wires and transparent coating layers coated outside the metal core wires; the wire diameter of the metal core wire is not more than 9 mu m; the tensile strength of the metal wire is more than 0.01N, so that the strength requirement of printing equipment on wires is met; the coating layer is a metal coating layer, and the chemical activity of the metal coating layer is larger than that of the metal core wire.
3. The conductive electrode according to claim 1 or 2, wherein the metal core wire has a single-layer structure;
or, the metal core wire comprises a metal core wire and at least one metal shell layer coated outside the metal core wire.
4. A conductive electrode according to claim 3, wherein the metal shell layer comprises a blackened layer.
5. A conductive electrode according to claim 3, wherein the thickness of the metal shell layer is not less than 1nm.
6. A conductive electrode according to claim 3, wherein the metal core wire has a circular, elliptical, rectangular cross section.
7. The conductive electrode according to claim 3, wherein a wire diameter of the metal core wire is constant along an axial direction of the metal core wire; or, at least part of the metal core wire has a wire diameter different from that of other parts along the axial direction of the metal core wire.
8. The conductive electrode according to claim 1 or 2, wherein the wire diameter of the metal core wire is between 0.1 μm and 9 μm; and/or the thickness of the coating layer is 2-100 microns.
9. The conductive electrode of claim 8, wherein the metal core wire has a wire diameter of no more than 5 μm.
10. The conductive electrode of claim 9, wherein the metal core wire has a wire diameter between 0.1 μm and 5 μm.
11. The conductive electrode according to claim 8, wherein the thickness of the coating layer is not less than 5 μm.
12. The conductive electrode of claim 11, wherein the thickness of the coating is no greater than 50 μιη.
13. The conductive electrode according to claim 1 or 2, wherein the thickness difference of different parts on the coating layer is not more than 1 μm.
14. The conductive electrode according to claim 1 or 2, wherein a through hole and an electrical connector in the through hole are provided on a coating layer of the metal wire in a lap joint area of the electrode line, the conductive electrode further comprises an FPC electrically connected to the metal core wire through the electrical connector, or the conductive electrode further comprises a frame trace electrically connected to the metal core wire through the electrical connector.
15. A touch screen comprising the conductive electrode of any one of claims 1-14.
CN202011149780.8A 2020-10-23 2020-10-23 Conductive electrode and touch screen with same Active CN114489361B (en)

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