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

Abstract

The present invention relates to the field of transparent conductive films and the technical field of their preparation, and specifically to a single-layer double-sided electrode capacitive screen, comprising a substrate, wherein: the upper surface of the substrate is sequentially provided with a first conductive layer, a first protective layer and a cover layer, the first conductive layer is composed of a patterned first conductive film and a first conductive circuit arranged at the edge of the first conductive film; the lower surface of the substrate is sequentially provided with a second conductive layer and a second protective layer, the second conductive layer is composed of a patterned second conductive film and a second conductive circuit arranged at the edge of the second conductive film; the signal lead-out ends of the first conductive circuit and the second conductive circuit are connected to an FPC wiring row, and the FPC wiring row is connected to a signal processor. The single-layer double-sided electrode capacitive screen integrates the functions of a flexible circuit board, realizes electron ionization and a touch surface on a substrate, no longer requires a lamination process of the film and the flexible circuit board, improves the yield rate, and has a double-sided touch function.

Description

Technical Field

[0001] The present 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 Art

[0002] Currently, mid-to-high-end electronic products all use capacitive screens, and due to the characteristics of capacitive screens, the touch screen has a multi-touch function, which increases the controllability of the touch screen to achieve normal indication work, which will protect the surface of the electronic products and thus protect the electronic products. Single-layer capacitive touch screens have lower manufacturing costs than multi-layer capacitive touch screens, simpler structures, stronger anti-static capabilities, and are not easily disturbed. They do not need to be calibrated during work and are suitable for promotion, so they have broad market application prospects.

[0003] CN105446559A discloses a capacitive touch screen with a single-layer double-sided wire electrode film and a manufacturing method, the method comprising: 1) cutting a glass plate material; 2) performing an anti-glare treatment on one side of the glass plate; 3) strengthening the overall hardness of the glass plate; 4) curing ink around the side of the glass plate that has not been treated with an anti-glare function; 5) then sequentially attaching a layer of a transparent metal conductive wire film including an X-pole metal conductive wire and a Y-pole metal conductive wire and a protective film to the side of the glass plate where the ink is cured; 6) spraying liquid anti-fouling glue on the side of the glass plate treated with an anti-glare function and curing it; 7) welding an FPC wiring block to the signal lead-out end of the electrode surface of the transparent metal conductive wires on both sides, and the FPC wiring block is connected to a signal processor.

[0004] At present, the touch screens used in the market are mostly resistive and multi-layer capacitive touch screens. Among them, the resistive touch screen needs to be pressed when used, with low operating efficiency and poor operating touch, which is not conducive to long-term and efficient use; the multi-layer capacitive touch screen has high production and manufacturing costs, poor anti-static ability, and short service life, which is not conducive to large-scale use and use in some high-interference and harsh environmental locations. With the advancement of technology, various structures of capacitive touch screens continue to emerge, among which the most commonly used are Apple's double-sided ITO structure, single-sided TP bridge structure, film-glass structure, film-film-glass structure, etc. Among them, the capacitive screen structure of the film-film structure, because it adopts a double-layer structure, requires multiple laminations in its manufacturing process, which not only has many process steps, but also easily generates bubbles. After multi-layer lamination, the product is relatively thick, the cost of raw materials is high, and the light transmittance is low. Summary of the invention

[0005] The purpose of the present invention is to overcome the above defects and provide a single-layer double-sided electrode capacitive screen and a preparation method thereof. The single-layer double-sided electrode capacitive screen provided by the present invention realizes the progress of touch screen product technology and enriches the variety of touch screen products.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A single-layer double-sided electrode capacitive screen comprises a substrate, wherein:

[0008] The upper surface of the substrate is provided with a first conductive layer, a first protective layer and a cover layer in sequence, wherein the first conductive layer is composed of a patterned first conductive film and a first conductive circuit provided at the edge of the first conductive film;

[0009] A second conductive layer and a second protective layer are sequentially arranged downwardly on the lower surface of the substrate; the second conductive layer is composed of a patterned second conductive film and a second conductive circuit arranged at the edge of the second conductive film;

[0010] The signal lead-out ends of the first conductive circuit and the second conductive circuit are connected to an FPC wiring block, and the FPC wiring block is connected to a signal processor.

[0011] Furthermore, the first conductive layer, the second conductive layer, the first protective layer and the second protective layer are formed by inkjet printing, and the cover plate layer is formed by inkjet printing a hardening layer solution or by laminating a cover plate.

[0012] Furthermore, when the cover plate layer is formed by laminating cover plates, the cover plate is one of PC plastic, PMMA acrylic plate, plastic-plastic composite material or hardened resin.

[0013] Furthermore, the first conductive circuit and the second conductive circuit are embodied as a transverse conductive circuit and a longitudinal conductive circuit that are arranged to cross each other.

[0014] The present invention provides a single-layer double-sided electrode capacitive screen, which integrates the functions of a flexible circuit board, realizes electron ionization and a touch surface on a single substrate, no longer requires a lamination process of a film and a flexible circuit board, reduces the requirements for the line width and precision of the flexible circuit board, enhances reliability, improves the yield rate, reduces costs, reduces the thickness of the touch panel, and has a double-sided touch function.

[0015] The present invention also provides a method for preparing the single-layer double-sided electrode capacitive screen, wherein the method comprises the following steps:

[0016] S1, inkjet printing a layer of nano silver rod conductive ink on the lower surface of the substrate, and then inkjet printing the nano silver rod conductive ink on the second edge, and then patterning to form a second conductive film and a second conductive circuit, the second conductive film and the second conductive circuit constitute a second conductive layer;

[0017] S2, inkjet printing a layer of protective layer solution on the surface of the second conductive layer to form a second protective layer;

[0018] S3, inkjet printing a layer of nano silver rod conductive ink on the upper surface of the substrate, and then inkjet printing the nano silver rod conductive ink on the edge, and then patterning to form a first conductive film and a first conductive circuit, the first conductive film and the first conductive circuit constitute a first conductive layer;

[0019] S4, inkjet printing a layer of protective layer solution on the surface of the first conductive layer to form a first protective layer;

[0020] S5, inkjet printing a hardening layer solution on the surface of the first protective layer or bonding a glass cover plate to form a cover plate layer 4;

[0021] S6. Connect an FPC wiring row to the signal lead-out ends of the first conductive circuit and the second conductive circuit, and connect the FPC wiring row to the signal processor to obtain the single-layer double-sided electrode capacitive screen.

[0022] In the present invention, the nano silver rod conductive ink may be the nano silver wire conductive ink in the prior art, such as the nano silver wire conductive ink disclosed in CN201810867435.4 and CN201810181879.2.

[0023] As a preferred solution, the composition of the nano silver rod conductive ink is as follows:

[0024]

[0025] Among them, the nano silver rod dispersion can be a nano silver rod dispersion in the prior art, specifically a nano silver rod dispersion prepared by the method in CN201910990587.8.

[0026] As a preferred embodiment, the nano silver rod dispersion described in the present invention is prepared by the following method:

[0027] (1) Add 50 ml of ethylene glycol into a single-necked flask, add 10 ml of 5 mM silver nitrate ethylene glycol solution, 10 ml of 0.006 mM sodium chloride, 30 ml of 2 mM PVP ethylene glycol solution and thickener sodium polyacrylate, mix, and stir for 30 minutes to obtain a reaction solution;

[0028] (2) adding the reaction solution into a flask, placing it in a vacuum drying oven, introducing inert gas, replacing the gas three times, adjusting the vacuum degree to -0.1 MPa, rotating speed to 1000 r / min, heating to 120° C., and keeping the temperature for 24 h to obtain a nanosilver rod stock solution;

[0029] (3) Disperse 100 ml of the nanosilver rod stock solution into 500 ml of water, slowly add 2.5 g of aluminum dihydrogen phosphate, stir, centrifuge, wait for the nanosilver rods to settle to the bottom, and remove the upper liquid;

[0030] (4) Disperse the silver nanorods that have settled to the bottom into 500 ml of water, slowly add 0.5 g of aluminum dihydrogen phosphate, stir, centrifuge, wait for the silver nanorods to settle to the bottom, remove the upper layer of liquid, and repeat 3 times;

[0031] (5) Finally, the silver nanorods that have settled to the bottom are dispersed in 200 ml of water to obtain a silver nanorod dispersion.

[0032] Furthermore, the monomer is a water-soluble or alcohol-soluble organic small molecule compound; preferably a water-soluble or alcohol-soluble organic small molecule compound with a relative molecular mass of less than 500; more preferably at least one of polyethylene glycol diacrylate, butyl acrylate, glycerol acrylate, pentaerythritol tripropionate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, N-vinyl pyrrolidone or acryloylmorpholine.

[0033] The resin is a water-soluble or alcohol-soluble resin; preferably at least one of aliphatic polyurethane acrylate oligomer, epoxy acrylate oligomer or polyester (meth) acrylate.

[0034] Specifically, the aliphatic polyurethane acrylate oligomer may be Sartomer CN9006NS or Changxing Chemical DR-U026, etc.; the epoxy acrylate oligomer may be Changxing Chemical 6210G, etc.; the polyester (meth) acrylate may be East Asia Synthetic M-7100, etc.

[0035] In the present invention, the auxiliary agent can be selected from one or more of a wetting and dispersing agent, a defoaming agent, and a film-forming auxiliary agent.

[0036] Specifically, wetting and dispersing agents are mainly used to reduce the surface tension of ink and improve the leveling of ink; for example, BYK DISPERBYK-199, DISPERBYK-2015, DISPERBYK-2012, BYK3410, DISPERBYK-180; TEGOORBYK-1802tps, 740, 750, 755, Wet 280, Wet_KL_245, Dispers_650; in particular, the wetting and dispersing agent can also participate in the photocuring reaction, so that the printed product presents a transparent appearance. Specifically, the wetting and dispersing agent can be one or more of silicone acrylates and modified polysiloxane polymers that can be crosslinked by radiation. Among them, the silicone acrylate that can be crosslinked by radiation can be TEGO RAD 2010, 2011, 2100, 2200N, 2250, etc. of Tego Company, and the silicone acrylate that can be crosslinked by radiation can participate in the photocuring reaction and undergo a crosslinking reaction, which is beneficial to suppress the phenomenon of haziness of the printed product; the modified polysiloxane polymer can be BYK-333, BYK-371, BYK-377 of BYK Company, Tego wet 270, Tego Glide 450 of Tego Company, etc. Defoaming agents are mainly used to eliminate bubbles generated during the filtering and printing process to prevent the bubbles from affecting the smoothness of printing. The defoaming agent can be a silicone-free polymer, such as Digo's silicone-free defoaming agent TEGO Airex 920, TEGO Airex 921, etc.

[0037] The film-forming aid is used to prevent the ink composition from sedimentation, thereby ensuring the stability of the ink composition during storage; the present invention does not strictly limit the type of film-forming aid, as long as it can meet the above requirements. The film-forming aid is starch, gum arabic, pectin, agar, gelatin, alginate, carrageenan, dextrin, etc., general gelatin, soluble starch, polysaccharide derivatives, etc.; synthetic products include at least one of carboxymethyl cellulose, propylene glycol alginate, methyl cellulose, sodium starch phosphate, sodium carboxymethyl cellulose, sodium alginate, casein, sodium polyacrylate, polyethylene oxide, and polyvinyl pyrrolidone.

[0038] The solvent is one or more of water, ethanol or isopropanol.

[0039] In the present invention, the protective layer solution may be a protective layer solution in the prior art, such as the protective layer coating solution disclosed in CN201810842309.3 and the like.

[0040] As a preferred embodiment, the protective layer solution is composed of the following:

[0041]

[0042] In the above composition, the resin is polyethylene, polyvinyl chloride, epoxy resin, polyurethane, polyacrylate, polymethyl methacrylate, fluoropolymer, polyamide, polyimide, polysiloxane, polycarbonate, polysulfone, polyvinyl alcohol, polyester, acrylonitrile-butadiene-styrene copolymer or its blend; the resin can also be a compound containing a conjugated structure or a charge transfer complex.

[0043] Specifically,

[0044] The conjugated structure is one or more of pyrrole, thiophene, aniline and its derivatives, oligopyrrole, oligothiophene, oligoaniline or copolymers thereof;

[0045] The charge transfer complex is TMB, TCNQ or a charge transfer complex formed by the two.

[0046] The functional material is at least one of an ultraviolet absorber, an antioxidant or a high-refractive and high-hardness additive. Specifically, the ultraviolet absorber is one or a combination of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines and hindered amines; the antioxidant is a free radical scavenging antioxidant, such as N-phenyl-α-naphthylamine and alkyl phenothiazine; a metal deactivation antioxidant, such as one or a combination of benzotriazole derivatives and mercaptobenzothiazole derivatives; the high-refractive and high-hardness additive is silica powder, talc, clay, mica, silicon dioxide, fly ash, silicate and other minerals, glass fiber, carbon fiber, whisker, etc.

[0047] The initiator used can be a water-based initiator or an alcohol-soluble initiator.

[0048] Specifically, the aqueous initiator can be aromatic ketones, including at least one of benzophenone derivatives, thioxanthone derivatives, alkyl aromatic ketone derivatives or benzil derivatives. The aqueous initiator can also be at least one of photoinitiator 2959, Dow AMP-95, IRGACURE 819 or IRGACURE 500.

[0049] The alcohol-soluble initiator may be at least one of 2-hydroxy-2-methyl-phenylacetone-1 (photoinitiator 1173), TPO or BDK.

[0050] In addition to the above-mentioned aqueous initiators or alcohol-soluble initiators, the initiator may also be a non-water-soluble initiator, including benzoin and its derivatives (benzoin, benzoin dimethyl ether, etc.); benzyls (diphenylacetophenone, etc.); alkyl phenones (diethoxyacetophenone, etc.); acylphosphine oxides (aroylphosphine oxide, dibenzoylphenylphosphine oxide, etc.); benzophenones (benzophenone, etc.).

[0051] The auxiliary agent is the same as above.

[0052] The solvent is one or more of acetone, butanone, methyl ethyl ketone, ethyl acetate, toluene, xylene, heavy aromatics and butyl acetate.

[0053] In the present invention, the hardening layer solution may be a hardening layer solution commonly used in the prior art, or may be prepared by the following composition:

[0054] Hardening resin 10-30%

[0055] Solvent Residue

[0056] Compared with the prior art, the present invention has the following advantages:

[0057] (1) The single-layer double-sided electrode capacitive screen of the present invention realizes a thinner touch screen by printing conductive patterns and circuits on a transparent substrate, and the product has higher sensitivity;

[0058] (2) The substrate adopts a front and back electrode array structure design, and both sides of the substrate adopt a relatively complementary horizontal and vertical two-way conductive wire electrode printing structure to improve the recognition efficiency and recognition accuracy of the touch screen;

[0059] (3) Printing a conductive film layer on one side of the substrate by inkjet printing, and then continue to inkjet print the film on the other side after the single-sided film is completed, so as to make a single-layer double-sided electrode capacitive screen;

[0060] (4) It adopts an integrated flexible single-layer double-sided electrode capacitive screen, which integrates the function of a flexible circuit board, and realizes the electronic circuit and thin-film touch screen on the same substrate. It does not require screen printing and laser etching processes for conductive lines, thereby improving reliability and yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0062] Figure 1 It is a structural schematic diagram of a single-layer double-sided electrode capacitive screen of the present invention;

[0063] Figure 2 The present invention is a single-layer double-sided electrode capacitive screen manufacturing process flow chart;

[0064] in:

[0065] 1 - substrate, 21 - first conductive layer, 211 - first conductive film, 212 - first conductive circuit, 22 - second conductive layer, 221 - second conductive film, 222 - second conductive circuit, 31 - first protective layer, 32 - second protective layer, 4 - cover layer, 5 - FPC terminal block, 6 - signal processor. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] Example 1

[0068] This embodiment provides a double-sided transparent conductive film. Figure 1 As shown, it includes: a substrate 1, the upper surface of the substrate 1 is sequentially provided with a first conductive layer 21, a first protective layer 31 and a cover layer 4, 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 211; the lower surface of the substrate 1 is sequentially provided with a second conductive layer 22 and a second protective layer 32; 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 221; the signal lead-out ends of the first conductive circuit 212 and the second conductive circuit 222 are connected to the FPC wiring board 5, and the FPC wiring board 5 is connected to the signal processor 6.

[0069] The first conductive circuit 212 and the second conductive circuit 222 are lateral conductive circuits and longitudinal conductive circuits that are arranged to cross each other.

[0070] See also Figure 2 The method for preparing the double-sided transparent conductive film of this embodiment comprises the following steps:

[0071] S1, such as Figure 2 As shown in (S1), a layer of nano silver rod conductive ink is inkjet printed on the lower surface of the substrate 1, and then nano silver rod conductive ink is inkjet printed on the edge, and then patterned to form a second conductive film 221 and a second conductive circuit 222, and the second conductive film 221 and the second conductive circuit 222 constitute a second conductive layer 22;

[0072] S2, such as Figure 2 As shown in (S2), a layer of protective layer solution is inkjet printed on the surface of the second conductive layer 22 to form a second protective layer 32;

[0073] S3, such as Figure 2 As shown in (S3), a layer of nanosilver rod conductive ink is inkjet printed on the upper surface of the substrate 1, and then the nanosilver rod conductive ink is inkjet printed on the edge, and then patterned to form a first conductive film 211 and a first conductive circuit 212, and the first conductive film 211 and the first conductive circuit 212 constitute a first conductive layer 21;

[0074] S4, such as Figure 2 As shown in (S4), a layer of protective layer solution is inkjet printed on the surface of the first conductive layer 21 to form a first protective layer 31;

[0075] S5, such as Figure 2 As shown in (S5), a glass cover plate is attached to the surface of the first protective layer 31 to form a cover plate layer 4;

[0076] S6, such as Figure 2 As shown in (S6), the signal lead-out ends of the first conductive circuit 212 and the second conductive circuit 222 are connected to the FPC wiring row 5, and the FPC wiring row 5 is connected to the signal processor 6, so as to obtain the single-layer double-sided electrode capacitive screen.

[0077] In this embodiment, the nano silver rod conductive ink can be the nano silver wire conductive ink in the prior art, such as the nano silver wire conductive ink disclosed in CN201810867435.4 and CN201810181879.2, etc.; the protective layer solution can be the protective layer solution in the prior art, such as the protective layer coating liquid disclosed in CN201810842309.3, etc.; 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 hardened resin.

[0078] Example 2

[0079] Different from Example 1, during the preparation of the single-layer double-sided electrode capacitive screen, the composition of the nano silver rod conductive ink is as follows:

[0080]

[0081] The nano silver rod dispersion is prepared by the following method:

[0082] (1) Add 50 ml of ethylene glycol into a single-necked flask, add 10 ml of 5 mM silver nitrate ethylene glycol solution, 10 ml of 0.006 mM sodium chloride, 30 ml of 2 mM PVP ethylene glycol solution and thickener sodium polyacrylate, mix, and stir for 30 minutes to obtain a reaction solution;

[0083] (2) adding the reaction solution into a flask, placing it in a vacuum drying oven, introducing inert gas, replacing the gas three times, adjusting the vacuum degree to -0.1 MPa, rotating speed to 1000 r / min, heating to 120° C., and keeping the temperature for 24 h to obtain a nanosilver rod stock solution;

[0084] (3) Disperse 100 ml of the nanosilver rod stock solution into 500 ml of water, slowly add 2.5 g of aluminum dihydrogen phosphate, stir, centrifuge, wait for the nanosilver rods to settle to the bottom, and remove the upper liquid;

[0085] (4) Disperse the silver nanorods that have settled to the bottom into 500 ml of water, slowly add 0.5 g of aluminum dihydrogen phosphate, stir, centrifuge, wait for the silver nanorods to settle to the bottom, remove the upper layer of liquid, and repeat 3 times;

[0086] (5) Finally, the silver nanorods that have settled to the bottom are dispersed in 200 ml of water to obtain a silver nanorod dispersion.

[0087] The composition of the protective layer solution is as follows:

[0088]

[0089]

[0090] The composition of the hardening layer solution is as follows:

[0091] Acrylic hardening resin 10%

[0092] Ethyl acetate residue.

[0093] Example 3

[0094] Different from Example 2, during the preparation of the single-layer double-sided electrode capacitive screen, the composition of the nano silver rod conductive ink is as follows:

[0095]

[0096] The composition of the protective layer solution is as follows:

[0097]

[0098] Example 4

[0099] Different from Example 2, during the preparation of the single-layer double-sided electrode capacitive screen, the composition of the nano silver rod conductive ink is as follows:

[0100]

[0101]

[0102] The protective layer solution is a protective layer coating solution prepared according to the method of Example 1 in CN201810842309.3.

[0103] The cover plate layer is formed by inkjet printing of a hardening layer solution, and the hardening layer solution is a hardening liquid model CH202 produced by Japan's Arakawa Corporation.

[0104] Example 5

[0105] Different from Example 4, during the preparation of the single-layer double-sided electrode capacitive screen, the nanosilver rod dispersion used in the composition of the nanosilver rod conductive ink is the nanosilver rod dispersion in the prior art, specifically the nanosilver rod dispersion prepared by the method of Example 1 in 201910990587.8.

[0106] The composition of the protective layer solution is as follows:

[0107]

[0108] The composition of the hardening layer solution is as follows:

[0109] Acrylic hardening resin 30%

[0110] Ethyl acetate residue

[0111] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a single-layer double-sided electrode capacitive screen, characterized in that: The single-layer double-sided electrode capacitive screen comprises a substrate (1), the upper surface of the substrate (1) being provided with a first conductive layer (21), a first protective layer (31) and a cover layer (4) in sequence, the first conductive layer (21) being composed of a patterned first conductive film (211) and a first conductive circuit (212) provided at the edge of the first conductive film; A second conductive layer (22) and a second protective layer (32) are sequentially arranged downwardly on the lower surface of the substrate (1); 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 lead-out ends of the first conductive circuit (212) and the second conductive circuit (222) are connected to an FPC wiring block (5), and the FPC wiring block (5) is connected to a signal processor (6). The preparation method comprises the following steps: S1, inkjet printing a layer of nano silver rod conductive ink on the lower surface of the substrate (1), and then inkjet printing the nano silver rod conductive ink on the edge, and then performing pattern drawing to form a second conductive film (221) and a second conductive circuit (222), the second conductive film (221) and the second conductive circuit (222) forming a second conductive layer (22); S2, inkjet printing a layer of protective layer solution on the surface of the second conductive layer (22) to form a second protective layer (32); S3, inkjet printing a layer of nanosilver rod conductive ink on the upper surface of the substrate (1), and then inkjet printing nanosilver rod conductive ink on the edge, and then patterning to form a first conductive film (211) and a first conductive circuit (212), the first conductive film (211) and the first conductive circuit (212) forming a first conductive layer (21); S4, inkjet printing a layer of protective layer solution on the surface of the first conductive layer (21) to form a first protective layer (31); S5, inkjet printing a hardening layer solution on the surface of the first protective layer (31) or bonding a glass cover plate to form a cover plate layer 4; S6. The signal lead-out ends of the first conductive circuit (212) and the second conductive circuit (222) are connected to an FPC wiring block (5), and the FPC wiring block (5) is connected to a signal processor (6), thereby obtaining the single-layer double-sided electrode capacitive screen.

2. The preparation method according to claim 1, characterized in that: The composition of the nano silver rod conductive ink is as follows:

3. The preparation method according to claim 1, characterized in that: The composition of the protective layer solution is as follows:

4. The preparation method according to claim 1, characterized in that: The composition of the hardening layer solution is as follows: Hardening resin 10-30% Solvent Residue.

5. The preparation method according to claim 1, characterized in that: The first conductive layer (21), the second conductive layer (22), the first protective layer (31) and the second protective layer (32) are formed by inkjet printing, and the cover plate layer (4) is formed by inkjet printing a hardening layer solution or by laminating the cover plate.

6. The preparation method according to claim 5, characterized in that: When the cover plate layer (4) is formed by laminating cover plates, the cover plate is one of PC plastic, PMMA acrylic plate, plastic-plastic composite material or hardened resin.

7. The preparation method according to claim 6, characterized in that: The first conductive circuit (212) and the second conductive circuit (222) are lateral conductive circuits and longitudinal conductive circuits that are arranged to cross each other.

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