KR20110082464A - Touch screen having transparent adhesive layer - Google Patents

Abstract

PURPOSE: A touch screen including a transparent adhesive layer is provided to prevent Newton ring effects by replacing an air layer with transparent adhesive resins. CONSTITUTION: A first transparent electrode(103) is formed in a transparent substrate(101). A second transparent electrode(107) is formed in a transparent film(109). A transparent adhesive layer(105) is located between the first and second transparent electrode. The transparent adhesive layer includes transparent adhesives including conductive balls(123). The transparent adhesive contains transparent resins and electrification preventing agent.

Description

Touch screen having a transparent adhesive layer

The present invention relates to a touch screen including a transparent adhesive layer.

As computers, various home appliances, and communication devices are digitized and rapidly becoming high-performance, there is an urgent need for the implementation of portable displays. In order to realize a portable display, the electrode material for the display should not only exhibit a transparent and low resistance value, but also have high flexibility to be mechanically stable, and should not have a short circuit or a large change in surface resistance even at high temperatures. .

In order to prevent contact between the upper electrode and the lower electrode, the resistive touch screen has a structure in which a dot spacer is formed with an air layer between the electrodes.

However, when the air layer is formed between the electrodes as described above, there is a difficulty in manufacturing a large area touch screen and a rollable flexible display.

In addition, due to the presence of the air layer, there have been many difficulties in continuously manufacturing the touch screen.

Accordingly, the present invention has been made to solve the above problems, it is an object of the present invention to provide a resistive touch screen that does not include an air layer.

Further, another object of the present invention relates to a continuous manufacturing method of a resistive touch screen.

In order to achieve the above object, the present invention includes a first transparent electrode formed on a transparent film, a second transparent electrode formed on a transparent film, and a conductive ball positioned between the first transparent electrode and the second transparent electrode. It provides a touch screen comprising a transparent adhesive layer formed of a transparent adhesive.

In one embodiment of the present invention, the transparent adhesive is characterized in that it comprises a transparent resin and an antistatic agent.

In one embodiment of the present invention, the transparent adhesive layer is characterized in that it has a resistance of 104 to 1010 Ω / □.

In one embodiment of the present invention, the antistatic agent is one or more selected from alkyl phosphate sodium salt (Alkylphosphate Sodium salt), conductive carbon black, carbon nanotubes (CNT), conductive polymers and surfactants, the conductive polymers Polyaniline, Polyethylenedioxythiophene, Polypyrole, Polythiophene, Poly (pphenylene), Polyacetylene, Polypyenylenevinylene (Poly (p-phenylene vinylene)), Polythienylenevinylene, Polyisothianaphyhene, Poly (p-phenylene sulfide) or poly-3,4-ethylene Dioxythiophene / polystyrenesulfonate (PEDOT / PSS), the surfactant being a cationic surfactant, anionic surfactant, amphoteric surfactant, nonionic surfactant, natural surfactant or polymer surfactant The cationic surfactants include trimethylammonium ethoxide, trimethylammonium butoxide, trimethylammonium phenoxide, trimethylammonium pi-chlorophenoxide, trimethylammonium lauoxide, alkyltrimethylammonium chloride and dichloride. Alkylmethylammonium or benzalkonium chloride, and the anionic surfactant is (3-lauramidopropyl) trimethylammoniummethyl sulfate, carbonic acid type, sulfate ester type, sulfonate or phosphate ester type, and the amphoteric surfactant is alkyldimethylamino acetic acid. Betaine, alkylamide dimethylamino beta acetate or 2-alkyl-ene-carboxy-ene-hydroxyimidazolinium betaine, and the nonionic surfactant is polyoxyethylene type, polyhydric alcohol ester type or ethylene oxide propylene oxide Block copolymer, the natural surfactant is characterized in that the lecithin.

 In one embodiment of the present invention, the conductive ball is characterized in that it contains 0.05 to 10% by weight based on the total weight of the transparent adhesive.

In one embodiment of the present invention, the conductive ball is characterized in that it has a diameter of 10 nm to 100 ㎛.

In one embodiment of the present invention, the transparent resin is characterized in that the compound containing any one or more of silicone, polyurethane, PVC, acrylic.

In one embodiment of the present invention, the transparent film is characterized in that the corona treatment or primer treatment layer is formed on one or both sides to improve the adhesion.

In one embodiment of the present invention, the first and second transparent electrode layer is characterized in that made of 50 ~ 5000 Ω / □ conductive polymer composition.

In one embodiment of the invention, the outer surface of the transparent film, a hard coating layer, an anti-finger (AF) layer, an anti-glare (AG) layer and anti-reflection (AR) At least one of the layers is formed.

In one embodiment of the present invention, the transparent film

Polyethylene Terephthalate (PET), Polycarbonate (PC), Polymethyl Methacrylate (PMMA), Polyethylene Naphthalate (PEN), Polyether Sulfone (PES), Cyclic Olefin Copolymer (COC), Triacetylcellulose (TAC) Film, Polyvinyl Alcoho (PVA) Film, Polyimide (PI) Film, Polystyrene (PS,), Biaxially Stretched Polystyrene K resin-containing bisxially oriented PS) BOPS), a transparent material such as glass or tempered glass, or a mixture thereof.

In order to achieve another object of the present invention, the present invention provides a step of providing a transparent adhesive film or an adhesive containing a conductive ball, and continuously pressing or coating a transparent film coated with a conductive polymer on the upper and lower portions of the adhesive film. It provides a method of manufacturing a touch screen comprising the step of.

In one embodiment of the present invention, the method may further comprise performing a corona treatment or a primer treatment to improve adhesion to the transparent film.

The touch screen according to the present invention can prevent the new uton ring phenomenon by improving the air layer with a transparent adhesive resin and can improve the transmittance. In addition, in the prior art, due to the air layer, it is possible to solve the problem that a bad stenosis occurs during winding.

In addition, when the upper electrode and the lower electrode are bonded to each other, the difficulty in automating the manufacturing method according to the dot spacer forming process may be solved.

1 schematically shows a cross section of a resistive touch screen according to the present invention.
2 and 3 schematically illustrate the continuous manufacture of a resistive touch screen according to the present invention.
4 schematically illustrates a roll of a touch screen panel manufactured according to the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the drawings.

In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail.

1 schematically shows a resistive touch screen 100 according to the present invention.

Touch screen 100 according to an embodiment of the present invention is a first transparent electrode 103 formed on a transparent substrate, a second transparent electrode 107 formed on a transparent film, and the first transparent electrode 103 and the second It characterized in that it comprises a transparent adhesive layer 105 formed of a transparent adhesive including a conductive ball 123, located between the transparent electrode 107.

The transparent adhesive layer may include a transparent adhesive resin and an antistatic agent. The transparent adhesive resin is preferably 70 to 99.1% by weight of the total transparent adhesive. In the case where the transparent adhesive resin is included in less than 70% by weight, the adhesive strength is inferior to the adhesion between the first transparent electrode 103 and the second transparent electrode 107, and in the case of exceeding 99.1% by weight. Relatively, the content of the conductive balls 123 is reduced, so that when a pressure is applied to the touch screen, a smooth conduction function cannot be given.

In addition, the transparent adhesive resin may be used by mixing an antistatic agent in a transparent adhesive resin having properties such as rubber (rubber) such as silicone, polyurethane, PVC, acrylic.

The antistatic agent is preferably used at 0.1 to 30% by weight of the total transparent adhesive layer of more than 104 Ω / □ material, Alkylphosphate Sodium salt (Alkylphosphate Sodium salt), conductive carbon black, carbon nanotubes (CNT), conductive polymer Examples include polyaniline, polyethylenedioxythiophene, polypyrole, polythiophene, poly (pphenylene), polyacetylene, polypyphenylenevinylene At least one selected from (Poly (p-phenylene vinylene)), polythienylenevinylene, polyisothianaphyhene, and poly (p-phenylene sulfide); As an active agent, it selects from a trimethyl ammonium ethoxide, a trimethyl ammonium butoxide, a trimethyl ammonium phenoxide, a trimethyl ammonium pi-chlorophenoxide, and a trimethyl ammonium lauoxide One cationic surfactant; and (3-lauramidopropyl) trimethylammoniummethyl sulfate as an anionic surfactant, and the antistatic agent is anionic surfactants such as carbonic acid type, sulfate ester type, sulfonate type and phosphate ester type; alkyltrimethylammonium chloride, chloride Cationic surfactants such as dialkylmethylammonium, benzalkonium chloride; bilateral interfaces such as alkyldimethylaminoacetic acid betaine, alkylamidedimethylaminoacetic acid betaine, 2-alkyl-ene-carboxy-ene-hydroxyimidazolinium betaine Active agent; nonionic surfactant such as polyoxyethylene type, polyhydric alcohol ester type, ethylene oxide propylene oxide block copolymer; natural surfactant such as lecithin; and one or more selected from polymer surfactant, poly-3, 4-ethylenedioxythiophene / polystyrenesulfonate (PEDOT / PSS) is particularly preferred.

The transparent adhesive layer 105 is formed by mixing an antistatic agent to the transparent adhesive resin as described above, preferably having a resistance of 104 to 1010 10 / □. When the resistance of the transparent adhesive layer exceeds 1010 mA / □, current is not transmitted from the first electrode 103 to the second electrode 107 even when a pressure is applied to the touch screen, and the conductivity is applied by the applied pressure. Even if the distance between the balls is narrowed, there is a problem that the recognition of the transmitted pressure is impossible. In addition, when the resistance is less than 104 kV / square, energization is performed between the first transparent electrode 103 and the second transparent electrode 107 even when no pressure is applied or when a pressure that is less than a predetermined pressure is applied. There is a problem that can be.

In addition, the transparent adhesive layer 105 may include a conductive ball 123, it is preferably included in the 0.05 to 10% by weight based on the total weight of the transparent adhesive. When the content is less than 0.05% by weight, it is difficult to exert a proper power supply function even when pressurized, whereas when the content is more than 10% by weight, there is a problem that excessive conduction is given.

The conductive ball 123 has a size of 10 nm to 100 ㎛. Such conductive balls can be made through, for example, three manufacturing steps. For example, in one step, the acrylic pellet, which is a transparent material, is made of a particulate core to have a uniform size with a diameter of 1 nm to 99 μm, and nickel plating of 8 to 100 nm is performed in two steps, and one to three steps is performed. It can be prepared through the step of applying a gold plating of 30 nm meter, this is just an example, the present invention is not limited to the method of manufacturing the conductive ball.

The transparent adhesive layer 105 may be manufactured by applying a film. In this case, the antistatic agent is mixed with the polymer resin used for the transparent adhesive film to prepare the extruder in a film state or in a liquid state.

In addition, the transparent films 101 and 109 may be corona-treated or primer-treated 115 on one or both sides to improve adhesion to the transparent electrode. Similarly, even when the transparent electrode is formed on the transparent substrate 101, a layer 113 formed of a primer treatment or the like may be formed to improve adhesion.

The first and second transparent electrode layers may be made of a conductive polymer composition, preferably made of poly-3,4-ethylenedioxythiophene / polystyrenesulfonate (PEDOT / PSS), more preferably It may be prepared from a conductive polymer composition comprising a conductive polymer and a liquid crystal polymer (including a liquid polymer binder).

Hard coating layer 111 may be formed on the other surface of the transparent film. Corona treatment or primer treatment 117 may be similarly performed to improve adhesion to the hard coating layer. In addition, instead of the hard coating layer 111, a window layer (products that have been improved in hardness and BM for mobile phones, hereinafter referred to as a window layer), an anti-finger (AF) layer, and light refraction blocking (AG; One or more of an anti-glare (AR) layer and an anti-reflection (AR) layer may be formed.

The transparent substrates 101 and 109 are combined with the image display device 121 through a double-sided adhesive film (DAT) or an OCA (119).

The transparent films 101 and 109 may be polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), poly Polyether Sulfone (PES), Cyclic Olefin Copolymer (COC), Triacetylcellulose (TAC) Film, Polyvinyl Alcoho (PVA) Film, Polyimide (PI) Film, Polystyrene , PS,), biaxially oriented polystyrene (K resin-containing bisxially oriented PS) BOPS), a transparent material such as glass or tempered glass, or a mixture thereof, may also be used.

In addition, an Ag electrode 125 for supplying a voltage to the transparent electrode may be formed. The Ag electrode 125 may be formed of an Ag paste or an organic silver based paste. The conductive parts of Ag electrodes include low resistance metals (Ag, Au, Cu, Al, etc.) or low resistance materials (conductive polymers), ITO, IZO, AZO, ATO, CNT, graphene, carbon black, organic silver, etc. It is manufactured by including an adhesive polymer in a material of 100 μs / sq or less.

2 and 3 schematically illustrate a method for continuously manufacturing a touch screen according to the present invention.

In the general resistive touch screen, it is difficult to continuously manufacture the touch screen due to the air layer. However, in the case of the resistive touch screen according to the present invention, there is no air layer. There is this.

Continuous production method of a touch screen according to the present invention comprises the steps of providing a transparent adhesive film containing a conductive ball; And continuously compressing the transparent film coated with the conductive polymer on the upper and lower portions of the adhesive film.

As shown in FIG. 2, a transparent adhesive film 201 containing conductive balls is prepared. The transparent film 203 coated with the conductive polymer is adhered to the upper and lower portions of the adhesive film 201 by bonding.

In order to bond the transparent film 203, a heat roll 209 that applies heat to the adhesive film 201 is used. The transparent film 203 coated with the conductive polymer to the upper and lower portions of the adhesive film 201 heated by the heat roll 209 is compressed by the cold pressing roll 211.

As in the touch screen, the transparent adhesive film is characterized in that it comprises a transparent resin and an antistatic agent, it is preferable to have a resistance of 104 to 1010 Ω / □. It may also be prepared by including a conductive ball 123 in the transparent adhesive film.

In addition, the antistatic agent is an alkyl sodium phosphate salt (Alkylphosphate Sodium salt), conductive carbon black, carbon nanotubes (CNT), as the conductive polymer polyaniline (Poltaniline), polyethylene dioxythiophene (Polyethylenedioxythiophene), polypyrole (Polypyrole), Polythiophene, Poly (pphenylene), Polyacetylene, Poly (p-phenylene vinylene), Polythienylenevinylene, Polys Tiana pentylene (Polyisothianaphyhene), Poly (p-phenylene sulfide) is used at least one selected; as a surfactant trimethyl thylammonium ethoxide, tmethyl ammonium butoxide, trimethyl ammonium A cationic surfactant selected from phenoxide, trimethylammonium pi-chlorophenoxide and trimethylammonium lauoxide; and (3-lauramidopropyl) trimethyl arm as an anionic surfactant Monium methyl sulfate and antistatic agent are anionic surfactants such as carbonic acid type, sulfuric acid ester type, sulfonate, phosphate ester type; cationic surfactants such as alkyltrimethylammonium chloride, dialkylmethylammonium chloride, benzalkonium chloride; alkyldimethylaminoacetic acid Amphoteric surfactants such as betaine, alkylamide dimethylamino beta acetate, 2-alkyl-ene-carboxy-ene-hydroxyimidazolinium betaine; polyoxyethylene type, polyhydric alcohol ester type, ethylene oxide propylene oxide block Nonionic surfactants such as coalesce; natural surfactants such as lecithin; and one or more selected from polymeric surfactants, and particularly poly-3,4-ethylenedioxythiophene / polystyrenesulfonate (PEDOT / PSS). desirable.

The transparent adhesive resin may be a material in which any one or more of silicon-based, polyurethane-based, PVC-based, and acrylic-based materials are mixed, and maintains adhesive strength.

When the conductive ball is added to the above, it is preferable to include 0.05 to 10% by weight based on the total weight of the transparent adhesive, and may have a diameter of 10 nm to 100 μm.

The transparent film 203 is polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyether sulfone (Polyether Sulfone, PES), Cyclic Olefin Copolymer (COC), Triacetylcellulose (TAC) Film, Polyvinyl Alcoho (PVA) Film, Polyimide (PI) Film, Polystyrene, PS ), Biaxially stretched polystyrene (K resin-containing bisxially oriented PS BOPS), transparent materials such as glass or tempered glass, or mixtures thereof, and laminated ones thereof may be used, in which Corona treatment or primer treatment can be performed.

A hard coat layer may be provided on one surface or both surfaces of the transparent film 203. This plays a role of preventing the film from falling off and transparency due to scratches and heat that may occur in the transparent film during manufacture of the touch screen input device.

In addition, when the Ag electrode wiring was printed at the edge, a printing line was given before supplying the transparent film 203, and the Ag electrode wiring was printed or treated with Ag paste in advance.

The hard coating layer 206 may be at least one of a hard coating layer, a window layer, an anti-finger (AF) layer, an anti-glare (AG) layer, and an anti-reflection (AR) layer. have.

And to protect the product with the protective film 207, when using the display and the product is used to remove the film. When the protective film is attached, it is simply laminated without thermocompression bonding.

The touch screen continuously manufactured as described above may be roll-packed 213 or cut into sheets to be laminated and supplied, and may be cut and supplied for each product size printed on a roll or sheet fabric.

This is shown in FIG. 4. Although FIG. 4 illustrates the product 401 in the longitudinal direction of the fabric, many products can be manufactured for each size (3 inches, 4 inches, etc.) to be manufactured. At this time, the width of the fabric is not limited. Depending on the device, 3m and 4m widths are also available. And in all processes that require drying, such as all printing and coating process was equipped with a drying line.

In addition, the Ag electrode coating 214 to the conductive film containing the conductive ball-containing antistatic liquid adhesive to the antistatic liquid adhesive 212 on the transparent film 203 in advance the Ag electrode is silk-screen printing, and the transparent adhesive film 205, hard coating sol 206 or 215 (or functional coating sol), and protective film 207.

Although the touch screen according to the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, and the transparent electrode film for the touch screen and the manufacturing method thereof according to the present invention are not limited thereto. It will be apparent that modifications and improvements are possible by those skilled in the art within the technical idea of the present invention.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.

100: touch screen 101: transparent film
103: first transparent electrode 105: transparent adhesive layer
107: second transparent electrode 109: transparent film
111: layers 113, 115, and 117: primer layers
119: double-sided adhesive film (DAT), OCA 121: image display device
123: conductive ball 125: Ag electrode
201: antistatic adhesive film containing conductive balls
203: conductive polymer coated transparent film 205: transparent adhesive film (OCA)
206: hard coat layer 207: protective film
209: hot roll 211: cold press roll
212: adhesive film containing a conductive ball 213: manufactured product
214: Ag electrode coating 215: sol for hard coating layer

Claims (20)

A first transparent electrode formed on the transparent substrate;
A second transparent electrode formed on the transparent film; And
A transparent adhesive layer comprising a transparent adhesive including conductive balls, positioned between the first transparent electrode and the second transparent electrode;
Touch screen comprising a. The touch screen as set forth in claim 1, wherein the transparent adhesive includes a transparent resin and an antistatic agent. The touch screen as set forth in claim 1, wherein the transparent adhesive layer has a resistance of 104 to 1010 μs / square. The method according to claim 2, wherein the antistatic agent uses at least one selected from alkyl sodium phosphate salt (Alkylphosphate Sodium salt), conductive carbon black, carbon nanotubes (CNT), conductive polymers and surfactants,
The conductive polymer may be polyaniline, polyethylenedioxythiophene, polypyrole, polythiophene, polypiphenylene, polyacetylene, polyacetylene Poly (p-phenylene vinylene), polythienylenevinylene, polyisothianaphyhene, poly (p-phenylene sulfide) or poly-3, 4-ethylenedioxythiophene / polystyrenesulfonate (PEDOT / PSS),
The surfactant is a cationic surfactant, anionic surfactant, amphoteric surfactant, nonionic surfactant, natural surfactant or polymer surfactant,
The cationic surfactants include trimethylylammonium ethoxide, trimethylammonium butoxide, trimethylammonium phenoxide, trimethylammonium phenoxide, chlorophenoxide, trimethylammonium lauoxide, alkyltrimethylammonium chloride and dialkylmethyl chloride. Ammonium or benzalkonium chloride,
The anionic surfactant is (3-lauramidopropyl) trimethylammonium methyl sulfate, carboxylic acid type, sulfate ester type, sulfonate or phosphate ester type,
The amphoteric surfactant is alkyl dimethylamino acetic acid betaine, alkylamide dimethylamino acetic acid betaine or 2-alkyl-ene-carboxy-ene-hydroxyimidazolinium betaine,
The nonionic surfactant is a polyoxyethylene type, polyhydric alcohol ester type or ethylene oxide propylene oxide block copolymer,
The natural surfactant is a touch screen, characterized in that the lecithin. The touch screen as set forth in claim 1, wherein the conductive balls are contained in an amount of 0.05 to 10 wt% based on the total weight of the transparent adhesive. The touch screen as set forth in claim 1, wherein the conductive balls have a diameter of 10 nm to 100 nm. The touch screen as set forth in claim 2, wherein the transparent resin is any one of silicone, polyurethane, PVC, and acrylic. The touch screen as set forth in claim 1, wherein the transparent film is formed with a corona treatment or a primer treatment to improve adhesion. The touch screen as set forth in claim 1, wherein the first and second transparent electrode layers are made of a conductive polymer composition. The method of claim 1, wherein the outer surface of the transparent film, one of a hard coating layer, an anti-finger (AF) layer, an anti-glare (AG) layer and an anti-reflection (AR) layer Touch screen, characterized in that formed above. The touch screen as set forth in claim 1, wherein the antistatic agent is present in an amount of 0.1 wt% to 30 wt% of the total transparent adhesive layer. The method of claim 1, wherein the transparent film is polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (Polymethyl Methacrylate (PMMA), polyethylene naphthalate (PEN), poly Polyether Sulfone (PES), Cyclic Olefin Copolymer (COC), Triacetylcellulose (TAC) Film, Polyvinyl Alcoho (PVA) Film, Polyimide (PI) Film, Polystyrene , PS), biaxially stretched polystyrene (K resin-containing bisxially oriented PS) BOPS), a transparent screen such as glass or tempered glass or a touch screen, characterized in that the mixture. Providing a transparent adhesive film containing conductive balls; And
Continuously compressing a transparent film coated with a conductive polymer on the upper and lower portions of the adhesive film;
Method of manufacturing a touch screen comprising a. The method of claim 13, wherein the transparent adhesive film comprises a transparent resin and an antistatic agent. The method of claim 13, wherein the transparent adhesive film has a resistance of 104 to 1010 μs / square. The method according to claim 14, wherein the antistatic agent is used at least one selected from alkyl sodium phosphate (Alkylphosphate Sodium salt), conductive carbon black, carbon nanotubes (CNT), conductive polymers and surfactants,
The conductive polymer may be polyaniline, polyethylenedioxythiophene, polypyrole, polythiophene, polypiphenylene, polyacetylene, polyacetylene Poly (p-phenylene vinylene), polythienylenevinylene, polyisothianaphyhene, poly (p-phenylene sulfide) or poly-3, 4-ethylenedioxythiophene / polystyrenesulfonate (PEDOT / PSS),
The surfactant is a cationic surfactant, anionic surfactant, amphoteric surfactant, nonionic surfactant, natural surfactant or polymer surfactant,
The cationic surfactants include trimethylylammonium ethoxide, trimethylammonium butoxide, trimethylammonium phenoxide, trimethylammonium phenoxide, chlorophenoxide, trimethylammonium lauoxide, alkyltrimethylammonium chloride and dialkylmethyl chloride. Ammonium or benzalkonium chloride,
The anionic surfactant is (3-lauramidopropyl) trimethylammonium methyl sulfate, carboxylic acid type, sulfate ester type, sulfonate or phosphate ester type,
The amphoteric surfactant is alkyl dimethylamino acetic acid betaine, alkylamide dimethylamino acetic acid betaine or 2-alkyl-ene-carboxy-ene-hydroxyimidazolinium betaine,
The nonionic surfactant is a polyoxyethylene type, polyhydric alcohol ester type or ethylene oxide propylene oxide block copolymer,
The natural surfactant is a method of manufacturing a touch screen, characterized in that the lecithin. The method of claim 13, wherein the conductive ball is included in an amount of 0.1 to 30 wt% based on the total weight of the transparent adhesive. The method of claim 13, wherein the conductive ball has a diameter of 10 nm to 100 nm. The method of claim 14, wherein the transparent resin is any one of silicone, polyurethane, PVC, and acrylic. The method of claim 13, wherein the method further comprises performing a corona treatment or a primer treatment to improve adhesion to the transparent film.

Images