CN111857402A - Touch screen and preparation method thereof - Google Patents
Touch screen and preparation method thereof Download PDFInfo
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- CN111857402A CN111857402A CN202010331856.2A CN202010331856A CN111857402A CN 111857402 A CN111857402 A CN 111857402A CN 202010331856 A CN202010331856 A CN 202010331856A CN 111857402 A CN111857402 A CN 111857402A
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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
- G06F3/0412—Digitisers structurally integrated in a display
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
Abstract
The invention relates to a touch screen and a preparation method thereof, wherein the touch screen comprises: the substrate comprises a touch area and a frame wiring area positioned around the touch area; the electrode layer comprises a plurality of touch electrodes positioned in the touch area, and the touch electrodes are provided with lap joint areas; a plurality of enameled wires with a plurality of touch-control electrode one-to-one, the enameled wire includes that the metal wire is by insulating part, the metal wire of insulating layer cladding to outer naked overlap joint portion, insulating part is located the frame is walked the line district, the overlap joint portion of enameled wire is located and is corresponded with this enameled wire touch-control electrode's overlap joint district department, just overlap joint portion with overlap joint district electric connection. According to the invention, the enameled wire with the insulating part and the lap joint part is used as the frame routing, so that the insulation between the metal wire and the metal wire can be realized without additionally coating an insulating glue layer, the wire spacing can be reduced, and the width of the frame routing area is further reduced.
Description
Technical Field
The invention relates to the field of touch screens, in particular to a touch screen with a narrow frame and a preparation method thereof.
Background
Touch screens have entered into people's lives in various forms, including small-sized mobile phones, tablets, medium-sized notebooks, all-in-one machines, medium-sized business displays, ordering machines, large-sized education whiteboards, meeting tablets, advertisement applications and the like, which bring convenience to people's lives. Meanwhile, people are also continuously improving the requirements for touch screens, such as fully-fitted 'black-in-one' effect touch screens, future flexible (/ foldable) touch screens, and ultra-narrow frame 'full-screen' required by current mobile phones, even large-size touch screens also require ultra-narrow frames like televisions.
However, in order to achieve a more accurate multi-point touch effect, a large-sized touch screen needs to have more electrode channels in the touch area, and the number of routing from the electrode channels to the frame of the binding area is more and more; and the increase of frame wiring, the space grow that occupies leads to the frame of touch-control screen wider and wider, and user experience feels poor.
In view of the above, it is desirable to provide a touch panel and a method for manufacturing the same to solve the above problems.
Disclosure of Invention
The invention aims to provide a touch screen with a narrow frame and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a touch screen, comprising:
the substrate comprises a touch area and a frame wiring area positioned around the touch area;
the electrode layer comprises a plurality of touch electrodes positioned in the touch area, and the touch electrodes are provided with lap joint areas;
a plurality of enameled wires with a plurality of touch-control electrode one-to-one, the enameled wire includes that the metal wire is by insulating part, the metal wire of insulating layer cladding to outer naked overlap joint portion, at least part the insulating part is located the frame is walked the line district, the overlap joint portion of enameled wire is located and is corresponded with this enameled wire the overlap joint district department of touch-control electrode, just the overlap joint portion with overlap joint district electric connection.
Furthermore, the touch screen further comprises an adhesive layer positioned on one side of the electrode layer, which is opposite to the substrate, a through hole for exposing the lap joint area to one side of the adhesive layer, which is opposite to the substrate, is formed in the adhesive layer, the enameled wire is positioned on one side of the adhesive layer, which is opposite to the electrode layer, and the lap joint part is electrically connected with the lap joint area at the through hole; or the touch screen is still including being located the overlap joint district dorsad the first conductive paste layer of one side of base plate, being located first conductive paste layer dorsad the glue film of one side of overlap joint district, be equipped with the confession on the glue film first conductive paste layer to deviating from the through-hole that one side of base plate exposes, the enameled wire is located the glue film deviates from one side of first conductive paste layer, just overlap joint portion in through-hole department with first conductive paste layer electric connection.
Further, conductive slurry is arranged in the through hole.
Furthermore, the touch screen further comprises a second conductive paste layer located on one side of the enameled wire, which faces away from the substrate, and the second conductive paste layer is electrically connected with the lap joint part and the touch electrode, or the touch screen further comprises a protective adhesive located at the joint of the lap joint part and the lap joint area.
In order to achieve the purpose, the invention also adopts the following technical scheme:
a preparation method of a touch screen comprises the following steps: s1, forming an electrode layer on the touch area of the substrate, wherein the electrode layer comprises a plurality of touch electrodes, and the touch electrodes are provided with lap joint areas; s2, arranging enameled wires corresponding to the touch electrodes one by one on a substrate, wherein each enameled wire comprises an insulating part and a lapping part, the insulating part is formed by covering a metal wire by an insulating layer, the metal wire is exposed outwards, at least part of the insulating part is located in a frame wiring area of the substrate, and the lapping part of each enameled wire is located in a lapping area, corresponding to the enameled wire, of the touch electrode; s3 electrically connecting the lap joint part with the lap joint area.
Further, the method for manufacturing the touch screen further includes the following steps between the step S1 and the step S2: the preparation method of the touch screen further comprises the following steps between the step S1 and the step S2: forming a glue layer on one side of the electrode layer, which is back to the substrate, wherein the glue layer is provided with a through hole for exposing the lap joint region to one side, which is away from the substrate;
or, a first conductive paste layer is formed in the lap joint area, a glue layer is formed on one side of the first conductive paste layer, which is back to the lap joint area, and a through hole for exposing the first conductive paste layer to one side, which is far away from the substrate, is formed in the glue layer.
Further, the preparation method of the touch screen further comprises the following steps: and filling the conductive slurry into the through hole and curing.
Further, step S3 is resistance welding the lap joint portion and the conductive paste; or, in step S3, a conductive paste is applied to the bonding portion to electrically connect the bonding portion and the bonding region.
Further, the preparation method of the touch screen further comprises the steps of carrying out dispensing fixation on the welding position; or the preparation method of the touch screen further comprises the step of carrying out dispensing fixation on the part coated with the conductive slurry.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, an enameled wire with an insulating part and a lapping part is used as a frame to route, the insulating part is positioned in the frame routing area, and the lapping part of the enameled wire is positioned at the lapping area of the touch electrode corresponding to the enameled wire; the metal wires can be insulated without additionally coating an insulating glue layer, so that enameled wire groups with small wire intervals are formed, the enameled wires can be directly overlapped, the interval between the enameled wires can be reduced to 0, and the width of a wire routing area of the frame can be reduced.
Drawings
Fig. 1 is a schematic layout view of a touch electrode and an enameled wire according to a preferred embodiment of the present invention;
FIG. 2 is a schematic structural view of an enameled wire according to a preferred embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a touch screen according to a preferred embodiment of the invention;
FIG. 4 is a schematic structural diagram of a touch screen according to another preferred embodiment of the invention;
fig. 5 is a schematic structural diagram of a touch screen according to another preferred embodiment of the invention.
100-a touch screen, 1-a substrate, 11-a touch area, 12-a frame wiring area, 2-an electrode layer, 21-a touch electrode, 22-an etching area, 3-an enameled wire, 31-a metal wire, 32-an insulating layer, 33-an insulating part, 34-a lap joint part, 4-an adhesive layer, 5-a first conductive paste layer, 6-a conductive paste, 7-a second conductive paste layer and 8-a protective adhesive.
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 5, a touch panel 100 of the present invention includes a substrate 1, an electrode layer 2 on the substrate 1, and a plurality of enameled wires 3, where the enameled wires 3 are used as frame traces.
Referring to fig. 1, the substrate 1 is functionally divided into a touch area 11 for performing touch operation and a border routing area 12 located around the touch area 11 by using conventional materials.
The electrode layer 2 comprises a plurality of touch electrodes 21 located in the touch area 11, the touch electrodes 21 are provided with lap areas electrically connected with the enameled wires 3, and the lap areas are located at the edge of the touch area 11 or at the junction of the touch area 11 and the frame wiring area 12.
In one embodiment, as shown in fig. 1, the touch electrode 21 is a circuit channel with a diamond structure formed by silver nanowires; specifically, a layer of silver nanowire conductive film may be formed on the substrate 1, and then a circuit channel with a diamond structure may be formed by a large-sized thin film laser etching apparatus.
Referring to fig. 1 and 2, the enameled wire 3 includes an insulating portion 33 formed by wrapping a metal wire 31 with an insulating layer 32, and a lap portion 34 formed by exposing the metal wire 31 outward, and when the enameled wire is wired as a frame, the metal wire 31 and the metal wire 31 can be insulated without additionally coating an insulating adhesive layer 4, so as to form an enameled wire 3 group with a small wire pitch, for example, a gap between adjacent enameled wires 3 is 1 μm to 10 μm; even the enameled wires 3 can be directly overlapped, that is, the space between the enameled wires 3 can be reduced to 0, and the width of the border routing area 12 can be reduced.
One end of the enameled wire 3 is electrically connected with the overlapping area of the touch electrode 21, and the other end extends to the binding area at the edge of the touch screen 100 and is connected with the FPC board. In the invention, the insulating parts 33 of the enameled wires 3 corresponding to the touch electrodes 21 one by one are centrally located in the frame routing area 12 and extend along the edge of the touch screen 100, the lap joint parts 34 of the enameled wires 3 extend to the lap joint area of the touch electrodes in a bending manner, and the lap joint parts 34 are electrically connected with the lap joint area; when the lap joint region is located at the edge of the touch control region 11 and is a certain distance away from the frame routing region 12, and the lap joint portion 34 bends and extends to the lap joint region, the partial insulation portion 33 adjacent to the lap joint portion also bends and extends and may leave the frame routing region; when the lap region is located at the intersection of the touch region 11 and the frame trace region 12, the insulation portion 33 is substantially remained in the frame trace region 12 even if the lap portion 34 bends and extends to the lap region.
In a specific embodiment, the diameter of the metal wire 31 is 1 μm to 100 μm, and the metal wire can be electrically connected to the bonding region; the thickness of the insulating layer 32 is 0.1-10 μm, so that the metal wire 31 can be insulated and protected, the wire diameter of the enameled wire 3 cannot be increased too much, and the wire stripping process is easy to control accurately. Preferably, the enameled wires 3 are laid by adopting an online wire stripping printing device.
Further, as shown in fig. 3 and fig. 5, the touch screen 100 further includes an adhesive layer 4 located on a side of the electrode layer 2 away from the substrate 1, and a through hole (not numbered) for exposing the bonding region to the side away from the substrate 1 is formed on the adhesive layer 4. The glue layer 4 has viscosity, is convenient for lay fixedly enameled wire 3, overlap joint portion 34 with the through-hole corresponds, simultaneously with the overlap joint district is corresponding, the diameter of through-hole is 0.5mm ~ 5mm, the electric connection of being convenient for. In the case that the adhesive layer 4 is thin, the bonding portion 34 can directly penetrate through the through hole to be electrically connected with the bonding region.
Or, referring to fig. 4, the touch screen 100 further includes a first conductive paste layer 5 located on one side of the lap joint region opposite to the substrate 1, and an adhesive layer 4 located on one side of the first conductive paste layer 5 opposite to the lap joint region, wherein a through hole for exposing one side of the first conductive paste layer 5 opposite to the substrate 1 is formed in the adhesive layer 4, and the diameter of the through hole is 0.5mm to 5 mm. The glue film 4 has viscosity, is convenient for lay the enameled wire 3, the overlap joint portion 34 with the through-hole corresponds, simultaneously with the first conductive paste layer 5 is corresponding, through setting up the first conductive paste layer 5 can realize the overlap joint portion 34 with the stable electric connection in overlap joint area. In the case where the adhesive layer 4 is thin, the bonding portion 34 can directly penetrate through the through hole to be electrically connected to the first conductive paste layer 5.
In a preferred embodiment, as shown in fig. 3 to 5, the through holes are filled with the conductive paste 6, so that the stability of the electrical connection can be further enhanced, and the process options of the electrical connection are expanded.
Further, referring to fig. 3 and 4, the touch screen 100 further includes a second conductive paste layer 7 located on a side of the enameled wire 3 opposite to the substrate 1, wherein the second conductive paste layer 7 is electrically connected to the bonding part 34 and the touch electrode 21.
In addition, as shown in fig. 5, the touch screen 100 further includes a protective adhesive 8 located at a connection position between the overlapping portion 34 and the overlapping area.
In order to solve the above technical problem, the method for manufacturing a touch screen of the present invention is capable of manufacturing the touch screen 100. Referring to the structures and their labels shown in fig. 1 to 5, the method for manufacturing the touch screen includes the following steps: s1, forming an electrode layer 2 on the touch area 11 of the substrate 1, wherein the electrode layer 2 comprises a plurality of touch electrodes 21, and the touch electrodes 21 are provided with lap joint areas; s2, laying enameled wires 3 corresponding to the touch electrodes 21 one by one on a substrate 1, where each enameled wire 3 includes an insulating portion 33 where a metal wire 31 is covered by an insulating layer 32, and a lapping portion 34 where the metal wire 31 is exposed outward, the insulating portion 33 is located in a border routing area 12 of the substrate 1, and the lapping portion 34 of the enameled wire 3 is located in a lapping area of the touch electrode 21 corresponding to the enameled wire 3; s3 electrically connects the bonding pad 34 and the bonding region.
Step S1 is to form a conductive film on the substrate 1, and then form a circuit path with a diamond structure by a large-scale thin film laser etching apparatus. In one embodiment, the conductive film is formed using a nano-silver wire.
In step S2, the enameled wires 3 with the diameter of 1 μm to 100 μm of the metal wire 31 and the thickness of the insulating layer 32 of 0.1 μm to 10 μm are selected as a frame for routing, and the insulation between the metal wire 31 and the metal wire 31 can be realized without additionally coating an insulating glue layer 4, so as to form groups of enameled wires 3 with a small wire pitch, for example, a gap between adjacent enameled wires 3 is 1 μm to 10 μm; even the enameled wires 3 can be directly overlapped, that is, the space between the enameled wires 3 can be reduced to 0, and the width of the border routing area 12 can be reduced
Further, the method for manufacturing the touch screen 100 further includes the following steps between the step S1 and the step S2: forming a glue layer 4 on one side of the electrode layer 2, which faces away from the substrate 1, wherein a through hole for exposing one side of the lap joint region, which faces away from the substrate 1, is formed in the glue layer 4; fig. 3 and 5 show the touch screen 100 finally formed. The glue film 4 has viscosity, is convenient for lay and fix the enameled wire 3, the overlap joint portion 34 with the through-hole corresponds, simultaneously with the overlap joint district is corresponding, the diameter of through-hole is 0.5mm ~ 5mm, is convenient for realize electric connection. In the case where the adhesive layer 4 is thin, the lap joint portion 34 may be electrically connected to the lap joint region.
Or, the preparation method of the touch screen 100 further includes the following steps between the step S1 and the step S2: forming a first conductive paste layer 5 in the lap joint area, and forming a glue layer 4 on one side of the first conductive paste layer 5, which is opposite to the lap joint area, wherein the glue layer 4 is provided with a through hole for exposing one side of the first conductive paste layer 5, which is opposite to the substrate 1, and the diameter of the through hole is 0.5-5 mm; fig. 4 is a diagram of a touch screen 100. The glue film 4 has viscosity, is convenient for lay fixedly enameled wire 3, overlap joint portion 34 with the through-hole corresponds, simultaneously with first conductive paste layer 5 is corresponding, through setting up first conductive paste layer 5 can realize overlap joint portion 34 with the stable electric connection in overlap joint district. In the case where the adhesive layer 4 is thin, the bonding portion 34 may be electrically connected to the first conductive paste layer 5.
Preferably, the method for manufacturing the touch screen 100 further includes: the preparation method of the touch screen 100 fills the conductive paste 6 into the through hole and solidifies; the stability of the electrical connection can be further enhanced, and the process selection of the electrical connection is enlarged; fig. 3 to 5 show the touch panel 100 finally formed.
Based on any one of the above methods for manufacturing the touch panel 100, in step S3, a second conductive paste layer 7 may be formed by coating a conductive paste on the bonding portion 34, and the bonding portion 34 is electrically connected to the touch electrode 21; fig. 3 and fig. 4 show the touch screen 100 finally formed. In the embodiment having the through-hole, the through-hole has a diameter of 0.5mm to 5mm, and the conductive paste has fluidity, and the landing zone and the landing part 34 can be realized through the through-hole.
Further, the preparation method of the touch screen 100 further includes dispensing and fixing the portion coated with the conductive paste, so as to improve the electrical connection stability, and particularly, dispensing and protecting the relevant portion with a low-viscosity UV glue or an self-drying glue through a dispensing head.
Based on any one of the above methods for manufacturing the touch screen 100, in step S3, the bonding portion 34 and the conductive paste 6 may be electrically connected by resistance welding; fig. 5 shows a touch panel 100 formed finally. For example, in the embodiment provided with the conductive silver paste, the metal wire 31 and the conductive paste 6 are conducted through the metallurgical fusion of welding by resistance welding.
Further, the manufacturing method of the touch screen 100 further includes dispensing and fixing the welding position, so as to improve welding stability, and particularly, dispensing and protecting the relevant position by using low-viscosity UV glue or self-drying glue through a dispensing head; fig. 5 shows a touch panel 100 formed finally.
Further, the preparation method of the touch screen 100 further includes the following steps: cutting off the ends of the frame routing area 12 to form separate channels; connecting the enameled wire 3 with an FPC board at the other end by using a laser welding mode; and cutting the appearance, and attaching the cover plate to the upper line and the lower line to obtain the touch screen.
In the steps of the invention, the first conductive paste layer 5 and the adhesive layer 4 are both formed by screen printing equipment, and the conductive paste is silver paste; and the enameled wire 3 is arranged by adopting an enameled wire 3 printer.
In summary, in the touch panel 100 and the manufacturing method thereof of the present invention, the enameled wire 3 having the insulating portion 33 and the overlapping portion 34 is used as a frame routing, the insulating portion 33 is located in the frame routing region 12, and the overlapping portion 34 of the enameled wire 3 is located at the overlapping region of the touch electrode 21 corresponding to the enameled wire 3; the metal wire 31 and the metal wire 31 can be insulated without additionally coating the insulating glue layer 4, so that groups of the enameled wires 3 with small wire spacing are formed, and even the enameled wires 3 can be directly overlapped together, that is, the spacing between the enameled wires 3 can be reduced to 0, so that the width of the frame wiring area 12 can be reduced.
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-listed detailed description is only a specific description of a possible embodiment of the present invention and is not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A touch screen, comprising:
the substrate comprises a touch area and a frame wiring area positioned around the touch area;
the electrode layer comprises a plurality of touch electrodes positioned in the touch area, and the touch electrodes are provided with lap joint areas;
a plurality of enameled wires with a plurality of touch-control electrode one-to-one, the enameled wire includes that the metal wire is by insulating part, the metal wire of insulating layer cladding to outer naked overlap joint portion, at least part the insulating part is located the frame is walked the line district, the overlap joint portion of enameled wire is located and is corresponded with this enameled wire the overlap joint district department of touch-control electrode, just the overlap joint portion with overlap joint district electric connection.
2. The touch screen of claim 1, further comprising an adhesive layer on a side of the electrode layer opposite to the substrate, wherein the adhesive layer is provided with a through hole for exposing the overlapping area to a side opposite to the substrate, the enameled wire is located on a side of the adhesive layer opposite to the electrode layer, and the overlapping portion is electrically connected to the overlapping area at the through hole;
or, the touch screen is still including being located the overlap joint district dorsad the first conductive paste layer of one side of base plate, being located first conductive paste layer dorsad the glue film of one side of overlap joint district, be equipped with the confession on the glue film first conductive paste layer to deviating from the through-hole that one side of base plate exposes, the enameled wire is located the glue film deviates from one side of first conductive paste layer, just overlap joint portion in through-hole department with first conductive paste layer electric connection.
3. The touch screen of claim 2, wherein the through holes are filled with conductive paste.
4. The touch screen of claim 1, further comprising a second conductive paste layer on a side of the enameled wire facing away from the substrate, wherein the second conductive paste layer is electrically connected to the overlapping portion and the touch electrode.
5. The touch screen of claim 1, further comprising a protective adhesive at a junction of the landing portion and the landing zone.
6. A preparation method of a touch screen is characterized by comprising the following steps:
s1, forming an electrode layer on the touch area of the substrate, wherein the electrode layer comprises a plurality of touch electrodes, and the touch electrodes are provided with lap joint areas;
s2, arranging enameled wires corresponding to the touch electrodes one by one on a substrate, wherein each enameled wire comprises an insulating part and a lapping part, the insulating part is formed by covering a metal wire by an insulating layer, the metal wire is exposed outwards, at least part of the insulating part is located in a frame wiring area of the substrate, and the lapping part of each enameled wire is located in a lapping area, corresponding to the enameled wire, of the touch electrode;
s3 electrically connecting the lap joint part with the lap joint area.
7. The method for preparing a touch screen according to claim 6, further comprising the following steps between the step S1 and the step S2:
forming a glue layer on one side of the electrode layer, which is back to the substrate, wherein the glue layer is provided with a through hole for exposing the lap joint region to one side, which is away from the substrate;
Or, a first conductive paste layer is formed in the lap joint area, a glue layer is formed on one side of the first conductive paste layer, which is back to the lap joint area, and a through hole for exposing the first conductive paste layer to one side, which is far away from the substrate, is formed in the glue layer.
8. The method for manufacturing the touch screen according to claim 7, further comprising: and filling the conductive slurry into the through hole and curing.
9. The method for manufacturing the touch screen according to any one of claims 6 to 8, wherein step S3 is to perform resistance welding on the lap joint part and the conductive paste; or, in step S3, a conductive paste is applied to the bonding portion to electrically connect the bonding portion and the bonding region.
10. The method for manufacturing the touch screen according to claim 9, further comprising dispensing and fixing a welding part; or the preparation method of the touch screen further comprises the step of carrying out dispensing fixation on the part coated with the conductive slurry.
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| CN202010331856.2A CN111857402A (en) | 2020-04-24 | 2020-04-24 | Touch screen and preparation method thereof |
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| CN202010331856.2A CN111857402A (en) | 2020-04-24 | 2020-04-24 | Touch screen and preparation method thereof |
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