CN111124194A

CN111124194A - Single-layer double-sided electrode capacitive screen and preparation method thereof

Info

Publication number: CN111124194A
Application number: CN202010059247.6A
Authority: CN
Inventors: 蔡劲锐; 鲁英杰
Original assignee: Huizhou Daqi Photoelectric Technology Co Ltd
Current assignee: Nantong Xianyan New Material Co ltd
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-05-08

Abstract

The invention relates to the technical field of transparent conductive films and preparation thereof, in particular to a single-layer double-sided electrode capacitive screen, which comprises a substrate, wherein: the upper surface of the base material is sequentially provided with a first conducting layer, a first protective layer and a cover plate layer upwards, wherein the first conducting layer is composed of a patterned first conducting film and a first conducting circuit arranged at the edge of the first conducting film; a second conductive layer and a second protective layer are sequentially arranged on the lower surface of the substrate downwards, and the second conductive layer is composed of a patterned second conductive film and a second conductive circuit arranged on the edge of the second conductive film; and signal leading-out ends of the first conductive circuit and the second conductive circuit are connected with an FPC wiring bar, and the FPC wiring bar is connected with a signal processor. The single-layer double-sided electrode capacitive screen integrates the functions of a flexible circuit board, realizes electronic ionization and touch surface on one substrate, does not need a laminating process of a film and the flexible circuit board, improves the yield, and has a double-sided touch function.

Description

Single-layer double-sided electrode capacitive screen and preparation method thereof

Technical Field

The invention relates to the technical field of electronic materials, in particular to a single-layer double-sided electrode capacitive screen and a preparation method thereof.

Background

The capacitive screen is used for the current middle-high-end electronic products, and due to the characteristics of the capacitive screen, the touch screen has a multi-point touch function, the controllability of the touch screen is improved, normal indication work is achieved, the surface of the electronic product can be protected, and therefore the electronic product is protected.

CN105446559A discloses a capacitive touch screen of single-layer double-sided wire electrode film and a manufacturing method thereof, the method includes: 1) cutting a glass plate material; 2) carrying out anti-dazzle function treatment on one surface of the glass plate; 3) then the integral hardness of the glass plate is strengthened; 4) curing printing ink around one surface of the glass plate which is not subjected to the anti-dazzle function treatment; 5) sequentially attaching a layer of transparent metal conducting wire film containing an X-pole metal conducting wire and a Y-pole metal conducting wire and a protective film on one surface of the glass plate on which the ink is cured; 6) spraying liquid antifouling glue on one surface of the glass plate treated by the anti-dazzle function and curing; 7) and the signal leading-out ends of the electrode surfaces of the two transparent metal conducting wires are welded with an FPC (flexible printed circuit) wiring bar, and the FPC wiring bar is connected with a signal processor.

Touch screens used in the current market are mainly resistive capacitive touch screens and capacitive touch screens with multilayer structures. The resistive touch screen needs to be pressed when in use, so that the operation efficiency is low, the operation touch feeling is poor, and the resistive touch screen is not beneficial to long-term use and high-efficiency use; the multilayer capacitive touch screen is high in production and manufacturing cost, poor in antistatic capacity, short in service life and not beneficial to large-scale use and use in places with high interference and severe environment. With the progress of technology, various structures of capacitive touch screens are emerging continuously, and the most commonly used structures include an apple double-sided ITO structure, a single-sided TP bridge structure, a film-glass structure, a film-glass structure and the like. The capacitive screen structure with the film-film structure adopts a double-layer structure, and multiple bonding processes are required in the manufacturing process, so that the manufacturing process is multiple, and bubbles are easily generated. Through multilayer laminating, the product is relatively thick, and former material cost is high, and the luminousness is lower.

Disclosure of Invention

The invention aims to overcome the defects and provides a single-layer double-sided electrode capacitive screen and a preparation method thereof. The single-layer double-sided electrode capacitive screen provided by the invention realizes the technical progress of touch screen products and enriches the types of touch screen products.

In order to achieve the purpose, the invention adopts the following technical scheme:

a single-layer double-sided electrode capacitive screen comprising a substrate, wherein:

the upper surface of the base material is sequentially provided with a first conducting layer, a first protective layer and a cover plate layer upwards, wherein the first conducting layer is composed of a patterned first conducting film and a first conducting circuit arranged at the edge of the first conducting film;

a second conducting layer and a second protective layer are sequentially arranged on the lower surface of the base material downwards; the second conducting layer is composed of a patterned second conducting film and a second conducting circuit arranged at the edge of the second conducting film;

and signal leading-out ends of the first conductive circuit and the second conductive circuit are connected with an FPC wiring bar, and the FPC wiring bar is connected with a signal processor.

Further, first conducting layer, second conducting layer, first protective layer and second protective layer form through inkjet printing, apron layer form through inkjet printing hardening layer solution or laminating apron.

Further, when the apron layer form through laminating apron, the apron be one of PC plastics, PMMA acrylic plate, mould and mould combined material or hardened resin.

Further, the first conductive line and the second conductive line are represented by a transverse conductive line and a longitudinal conductive line which are arranged to cross each other.

The invention provides a single-layer double-sided electrode capacitive screen, which integrates the functions of a flexible circuit board, realizes electronic ionization and a touch surface on one substrate, does not need a laminating process of a film and the flexible circuit board, reduces the requirements on the line width and the precision of the flexible circuit board, enhances the reliability, improves the yield, reduces the cost, reduces the thickness of the touch panel board, and has a double-sided touch function.

The invention also provides a preparation method of the single-layer double-sided electrode capacitive screen, wherein the preparation method comprises the following steps:

s1, ink-jet printing a layer of nano silver rod conductive ink on the lower surface of the base material, ink-jet printing the nano silver rod conductive ink on the second edge, and then performing pattern drawing to form a second conductive film and a second conductive circuit, wherein the second conductive film and the second conductive circuit form a second conductive layer;

s2, ink-jet printing a layer of protective layer solution on the surface of the second conductive layer to form a second protective layer;

s3, ink-jet printing a layer of nano silver rod conductive ink on the upper surface of the base material, ink-jet printing the nano silver rod conductive ink on the edge, and patterning to form a first conductive film and a first conductive circuit, wherein the first conductive film and the first conductive circuit form a first conductive layer;

s4, ink-jet printing a layer of protective layer solution on the surface of the first conductive layer to form a first protective layer;

s5, printing a hardened layer solution on the surface of the first protective layer in an ink-jet mode or attaching a glass cover plate to form a cover plate layer 4;

and S6, connecting FPC (flexible printed circuit) wiring bars at the signal leading-out ends of the first conductive circuit and the second conductive circuit, and connecting the FPC wiring bars with a signal processor to obtain the single-layer double-sided electrode capacitive screen.

In the present invention, the nano silver rod conductive ink may be a nano silver wire conductive ink in the prior art, such as a nano silver wire conductive ink disclosed in CN201810867435.4, CN201810181879.2, and the like.

As a preferable scheme, the composition of the nano silver rod conductive ink is as follows:

the nano silver rod dispersion liquid can be a nano silver rod dispersion liquid in the prior art, and specifically is a nano silver rod dispersion liquid prepared by adopting the method in CN 201910990587.8.

As a preferable scheme, the nano silver rod dispersion liquid in the invention is prepared by adopting the following method:

(1) adding 50ml of ethylene glycol into a single-neck flask, adding 10ml of silver nitrate ethylene glycol solution with the molar concentration of 5mM, 10ml of sodium chloride with the molar concentration of 0.006mM, 30ml of PVP ethylene glycol solution with the molar concentration of 2mM and a thickening agent sodium polyacrylate, mixing, and stirring for 30 minutes to obtain a reaction solution;

(2) adding the reaction liquid into a flask, placing the flask in a vacuum drying oven, introducing inert gas, replacing the gas for three times, adjusting the vacuum degree to be 0.1Mpa, rotating speed to be 1000r/min, heating to 120 ℃, and preserving heat for 24 hours to obtain a nano silver rod stock solution;

(3) dispersing 100ml of the nano silver rod stock solution into 500ml of water, slowly adding 2.5g of aluminum dihydrogen phosphate, stirring, centrifuging, and removing the upper layer liquid when the nano silver rod is settled to the bottom;

(4) dispersing the nano silver rod settled to the bottom into 500ml of water, slowly adding 0.5g of aluminum dihydrogen phosphate, stirring, centrifuging, removing the upper liquid after the nano silver rod settled to the bottom, and repeating for 3 times;

(5) and finally dispersing the nano silver rod settled to the bottom into 200ml of water to obtain the nano silver rod dispersion liquid.

Further, the monomer is a water-soluble or alcohol-soluble organic small molecular compound; preferably a water-soluble or alcohol-soluble organic small molecule compound having a relative molecular mass of less than 500; more preferably at least one of polyethylene glycol diacrylate, butyl acrylate, glyceryl acrylate, pentaerythritol tripropionate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, N-vinylpyrrolidone or acryloylmorpholine.

The resin is water-soluble or alcohol-soluble resin; at least one of aliphatic urethane acrylate oligomer, epoxy acrylate oligomer, or polyester (meth) acrylate is preferable.

Specifically, the aliphatic polyurethane acrylate oligomer can be Sadoma CN9006NS or Changxing chemical DR-U026, etc.; the epoxy acrylate oligomer can be chemical 6210G of Changxing, and the like; the polyester (methyl) acrylate can be M-7100 synthesized in east Asia and the like.

In the invention, the auxiliary agent can be one or more selected from wetting dispersant, defoaming agent and film-forming auxiliary agent.

Specifically, the wetting dispersant is mainly used for reducing the surface tension of the ink and improving the leveling property of the ink; such as bike DISPERBYK-199, DISPERBYK-2015, DISPERBYK-2012, BYK3410, DISPERBYK-180; TEGOERBYK-1802tps, 740, 750, 755, A,

Wet 280, Wet _ KL _245, Dispers _ 650; in particular, the wetting dispersant may also participate in the photocuring reaction, thereby giving the printed article a transparent appearance. Specifically, the wetting dispersant may be one or more of a silicone acrylate and a modified polysiloxane-based polymer capable of radiation crosslinking. The organic silicon acrylate capable of being subjected to radiation crosslinking can be TEGO RAD 2010, 2011, 2100, 2200N, 2250 and the like of Digao company, and can participate in a photocuring reaction and perform a crosslinking reaction, so that phenomena such as fogging of a printed product can be inhibited; the modified polysiloxane polymer may be BYK-333, BYK-371, BYK-377 from Bick, Tego wet 270 from Digao, Tego Glide 450 from Digao, and the like. Defoaming agentThe method is used for eliminating bubbles generated in the filtering and printing processes and avoiding the generated bubbles from influencing the printing fluency; the defoamer can be a silicone-free polymer, such as digao silicone-free defoamers TEGO Airex 920, TEGO Airex 921, and the like.

The film-forming assistant is used for preventing the ink composition from depositing, so that the stability of the ink composition in the storage process is ensured; the type of the film-forming aid is not particularly limited as long as the aforementioned requirements are satisfied. The film-forming auxiliary agent is starch, arabic gum, pectin, agar, gelatin, alginate jelly, carrageenan, dextrin, etc., general gelatin, soluble starch, polysaccharide derivative, etc.; the synthetic product comprises at least one of carboxymethyl cellulose, propylene glycol alginate, methyl cellulose, sodium starch phosphate, sodium carboxymethyl cellulose, sodium alginate, casein, sodium polyacrylate, polyoxyethylene, and polyvinylpyrrolidone.

The solvent is one or more of water, ethanol or isopropanol.

In the present invention, the protective layer solution may be a protective layer solution in the prior art, and may be, for example, a protective layer coating solution disclosed in CN201810842309.3 and the like.

As a preferable scheme, the composition of the protective layer solution is as follows:

in the composition, the resin is polyethylene, polyvinyl chloride, epoxy resin, polyurethane, polyacrylate, polymethyl methacrylate, fluoropolymer, polyamide, polyimide, polysiloxane, polycarbonate, polysulfone, polyvinyl alcohol, polyester, acrylonitrile-butadiene-phenylpropene copolymer or a blend thereof; the resin can also be a compound containing a conjugated structure or a charge transfer complex.

In particular, the first and second (c) substrates,

the conjugated structure is one or more of pyrrole, thiophene, aniline and derivatives thereof, oligomeric pyrrole, oligomeric thiophene, oligomeric aniline or copolymers among the pyrrole, thiophene, aniline and oligomeric pyrrole;

the charge transfer complex is a charge transfer complex formed by TMB, TCNQ or both.

The functional material is at least one of an ultraviolet absorbent, an antioxidant or a high-refraction high-hardness additive, specifically, the ultraviolet absorbent is one or a combination of more of salicylic acid esters, benzophenones, benzotriazoles, substituted acrylonitrile, triazines and hindered amines, the antioxidant is a free radical scavenging antioxidant such as N-phenyl- α -naphthylamine, alkyl phenothiazine and the like, the metal deactivation antioxidant such as one or a combination of more of benzotriazole derivatives and mercaptobenzothiazole derivatives, and the high-refraction high-hardness additive is silicon micropowder, talcum powder, argil, mica, silicon dioxide, fly ash, silicate and other minerals, glass fibers, carbon fibers, whiskers and the like.

The initiator used may be an aqueous initiator or an alcohol-soluble initiator.

Specifically, the aqueous initiator may be an aryl ketone, including at least one of a benzophenone derivative, a thioxanthone derivative, an alkyl aryl ketone derivative, or a benzil derivative. The aqueous initiator can also be at least one of a photoinitiator 2959, Dow AMP-95, IRGACURE 819 or IRGACURE 500.

The alcohol-soluble initiator can be at least one of 2-hydroxy-2-methyl-phenyl acetone-1 (photoinitiator 1173), TPO or BDK.

The initiator can be a water-insoluble initiator besides the water-soluble initiator or the alcohol-soluble initiator, and comprises benzoin and derivatives (benzoin, benzoin dimethyl ether and the like); benzils (diphenylethanone, etc.); alkylphenones (diethoxyacetophenone and the like); acylphosphine oxides (aroylphosphine oxide, bisbenzoylphenylphosphine oxide, etc.); benzophenones (benzophenone, etc.).

The auxiliary agent is the same as above.

The solvent is one or more of acetone, butanone, methyl ethyl ketone, ethyl acetate, toluene, xylene, heavy aromatic hydrocarbon and butyl acetate.

In the invention, the hardened layer solution can be a hardened layer solution commonly used in the prior art, and can also be prepared from the following components:

hardening resin 10-30%

The balance of solvent

Compared with the prior art, the invention has the following advantages:

(1) according to the single-layer double-sided electrode capacitive screen, the conductive patterns and the circuits are printed on the transparent substrate, so that the touch screen is light and thin, and the product sensitivity is higher;

(2) the substrate is designed by adopting an array structure of electrodes on the front side and the back side, and the two sides of the substrate adopt a printing structure of electrodes of opposite complementary transverse and longitudinal conductive wires, so that the recognition efficiency and the recognition precision of the touch screen are improved;

(3) printing a conductive film layer on one surface of a substrate by ink-jet printing, and continuing ink-jet printing the film on the other surface after the single-sided film is finished to manufacture a single-layer double-sided electrode capacitive screen;

(4) by adopting the integrated flexible single-layer double-sided electrode capacitive screen, the functions of the flexible circuit board are integrated, the electronic circuit and the thin film touch screen are on the same substrate, the screen printing and laser etching processes of the conducting circuit are not needed, and the reliability and the yield are improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a single-layer double-sided electrode capacitive screen according to the present invention;

FIG. 2 is a flow chart of a process for manufacturing a single-layer double-sided electrode capacitive screen according to the present invention;

wherein:

1-substrate, 21-first conducting layer, 211-first conducting film, 212-first conducting wire, 22-second conducting layer, 221-second conducting film, 222-second conducting wire, 31-first protective layer, 32-second protective layer, 4-cover plate layer, 5-FPC wiring row, 6-signal processor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The present embodiment provides a double-sided transparent conductive film, as shown in fig. 1, including: the manufacturing method comprises the following steps that a substrate 1 is provided, wherein a first conducting layer 21, a first protective layer 31 and a cover plate layer 4 are sequentially arranged on the upper surface of the substrate 1 upwards, and the first conducting layer 21 is composed of a patterned first conducting film 211 and a first conducting circuit 212 arranged at the edge of the first conducting film 211; the lower surface of the substrate 1 is sequentially provided with a second conductive layer 22 and a second protective layer 32 downwards; the second conductive layer 22 is composed of a patterned second conductive film 221 and a second conductive trace 222 disposed at an edge of the second conductive film 221; the signal leading-out ends of the first conductive circuit 212 and the second conductive circuit 222 are connected with an FPC wiring bar 5, and the FPC wiring bar 5 is connected with a signal processor 6.

The first conductive traces 212 and the second conductive traces 222 are shown as transverse conductive traces and longitudinal conductive traces disposed across from one another.

Referring to fig. 2, the method for preparing the double-sided transparent conductive film of the present embodiment includes the following steps:

s1, as shown in fig. 2 (S1), ink-jet printing a layer of silver nanorod conductive ink on the lower surface of the substrate 1, ink-jet printing the silver nanorod conductive ink on the edge, and patterning to form a second conductive film 221 and a second conductive trace 222, where the second conductive film 221 and the second conductive trace 222 form a second conductive layer 22;

s2, as shown in fig. 2 (S2), ink-jet printing a protective layer solution on the surface of the second conductive layer 22 to form a second protective layer 32;

s3, as shown in fig. 2 (S3), ink-jet printing a layer of nano silver rod conductive ink on the upper surface of the substrate 1, ink-jet printing the nano silver rod conductive ink on the edge, and patterning to form a first conductive film 211 and a first conductive trace 212, where the first conductive film 211 and the first conductive trace 212 form a first conductive layer 21;

s4, as shown in fig. 2 (S4), ink-jet printing a protective layer solution on the surface of the first conductive layer 21 to form a first protective layer 31;

s5, as shown in fig. 2 (S5), attaching a glass cover to the surface of the first protective layer 31 to form a cover layer 4;

and S6, as shown in (S6) of FIG. 2, connecting an FPC (flexible printed circuit) wiring bar 5 to the signal leading-out ends of the first conductive circuit 212 and the second conductive circuit 222, and connecting the FPC wiring bar 5 with a signal processor 6 to obtain the single-layer double-sided electrode capacitive screen.

In this embodiment, the nano silver rod conductive ink may be a nano silver wire conductive ink in the prior art, such as a nano silver wire conductive ink disclosed in CN201810867435.4, CN201810181879.2, and the like; the protective layer solution may be a protective layer solution in the prior art, such as a protective layer coating solution disclosed in CN201810842309.3 and the like; the cover plate can be a cover plate commonly used in the prior art, such as one of PC plastic, PMMA acrylic plate, plastic-plastic composite material or hardening resin.

Example 2

Different from the embodiment 1, in the preparation process of the single-layer double-sided electrode capacitive screen, the composition of the nano silver rod conductive ink is as follows:

the nano silver rod dispersion liquid is prepared by the following method:

The protective layer solution comprises the following components:

the hardening layer solution comprises the following components:

acrylic acid hardening resin 10%

And the balance of ethyl acetate.

Example 3

Different from the embodiment 2, in the preparation process of the single-layer double-sided electrode capacitive screen, the composition of the nano silver rod conductive ink is as follows:

the protective layer solution comprises the following components:

example 4

the protective layer solution was a protective layer coating solution prepared according to the method of example 1 in CN 201810842309.3.

The cover plate layer is formed by ink-jet printing of a hardening layer solution, and the hardening layer solution is hardening liquid with the model number of CH202 of the Japan Seisaku company.

Example 5

Different from the embodiment 4, in the preparation process of the single-layer double-sided electrode capacitive screen, the nano silver rod dispersion liquid adopted in the composition of the nano silver rod conductive ink is a nano silver rod dispersion liquid in the prior art, and specifically is the nano silver rod dispersion liquid prepared by the method of the embodiment 1 in 201910990587.8.

The protective layer solution comprises the following components:

the hardening layer solution comprises the following components:

acrylic acid hardening resin 30%

The balance of ethyl acetate

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a two-sided electrode capacitive screen of individual layer, includes substrate (1), its characterized in that:

the upper surface of the base material (1) is sequentially and upwards provided with a first conductive layer (21), a first protective layer (31) and a cover plate layer (4), wherein the first conductive layer (21) is composed of a patterned first conductive film (211) and a first conductive circuit (212) arranged at the edge of the first conductive film;

a second conductive layer (22) and a second protective layer (32) are sequentially arranged on the lower surface of the base material (1) downwards, and the second conductive layer (22) is composed of a patterned second conductive film (221) and a second conductive circuit (222) arranged at the edge of the second conductive film;

the signal leading-out ends of the first conductive circuit (212) and the second conductive circuit (222) are connected with an FPC (flexible printed circuit) wiring bar (5), and the FPC wiring bar (5) is connected with a signal processor (6).

2. Single-layer double-sided electrode capacitive screen according to claim 1, characterized in that the first (21), second (22), first (31) and second (32) conductive layers are formed by ink-jet printing and the cover plate layer (4) is formed by ink-jet printing of a hardened layer solution or by applying a cover plate.

3. The single-layer double-sided electrode capacitive screen of claim 2, wherein when the cover sheet layer (4) is formed by attaching a cover sheet, the cover sheet is one of PC plastic, PMMA acrylic, plastic-plastic composite, or hardened resin.

4. The single-layer double-sided electrode capacitive screen as recited in any one of claims 1-3, characterized in that the first conductive traces (212) and the second conductive traces (222) are embodied as transverse conductive traces and longitudinal conductive traces disposed to cross each other.

5. A method for preparing a single-layer double-sided electrode capacitive screen according to any one of claims 1 to 4, wherein the method comprises the following steps:

s1, performing ink-jet printing on a layer of nano silver rod conductive ink on the lower surface of the base material (1), performing ink-jet printing on the nano silver rod conductive ink on the edge, and performing pattern drawing to form a second conductive film (221) and a second conductive circuit (222), wherein the second conductive film (221) and the second conductive circuit (222) form a second conductive layer (22);

s2, ink-jet printing a layer of protective layer solution on the surface of the second conductive layer (22) to form a second protective layer (32);

s3, ink-jet printing a layer of nano silver rod conductive ink on the upper surface of the base material (1), ink-jet printing the nano silver rod conductive ink on the edge, and then patterning to form a first conductive film (211) and a first conductive circuit (212), wherein the first conductive film (211) and the first conductive circuit (212) form a first conductive layer (21);

s4, ink-jet printing a layer of protective layer solution on the surface of the first conductive layer (21) to form a first protective layer (31);

s5, printing a hardened layer solution on the surface of the first protective layer (31) in an ink-jet mode or attaching a glass cover plate to form a cover plate layer 4;

and S6, connecting an FPC (flexible printed circuit) wiring bar (5) at signal leading-out ends of the first conductive circuit (212) and the second conductive circuit (222), and connecting the FPC wiring bar (5) with a signal processor (6) to obtain the single-layer double-sided electrode capacitive screen.

6. The preparation method according to claim 5, wherein the composition of the nano silver rod conductive ink is as follows:

7. the method according to claim 5, wherein the composition of the protective layer solution is as follows:

8. the method according to claim 5, wherein the composition of the hardened layer solution is as follows:

hardening resin 10-30%

The balance of solvent.