KR20130071862A - Method for manufacturing touch panel - Google Patents

Abstract

PURPOSE: A method for manufacturing a touch panel is provided to achieve excellent durability, by forming an electrode pattern containing silver through exposure/development of a silver halide emulsion layer. CONSTITUTION: An optical filter layer (140) blocking a light selectively is formed on one plane or both planes of a window (110) which is a supporting body comprised in the outermost. If the optical filter layer is formed on one plane of the window, a silver halide emulsion layer is formed on the other plane of the window and the optical filter layer. If the optical filter layer is formed on both planes of the window, the silver halide emulsion layer is formed on the optical filter layer. A first and a second electrode pattern (120,130) containing silver expose and develop the silver halide emulsion layer selectively, and are formed on both sides of the window. A protection layer covering the first electrode pattern is formed.

Description

Method for Manufacturing Touch Panel

The present invention relates to a method for manufacturing a touch panel.

With the development of computers using digital technology, auxiliary devices of computers are being developed together. Personal computers, portable transmission devices, and other personal information processing devices use various input devices such as a keyboard and a mouse And performs text and graphics processing.

However, as the use of computers is gradually increasing due to the rapid progress of the information society, there is a problem that it is difficult to efficiently operate a product by using only a keyboard and a mouse which are currently playing an input device. Therefore, there is an increasing need for a device that is simple and less error-prone, and that allows anyone to easily input information.

In addition, the technology related to the input device is shifting beyond the level that satisfies the general functions, such as high reliability, durability, innovation, design and processing related technology, etc. In order to achieve this purpose, As a possible input device, a touch panel has been developed.

Such a touch panel can be used as a flat panel display device such as an electronic notebook, a liquid crystal display device (LCD), a plasma display panel (PDP), or an electro luminescence (EL) And is a tool used by a user to select desired information while viewing the image display apparatus.

Meanwhile, the types of touch panels include resistive type, capacitive type, electro-magnetic type, SAW type, surface acoustic wave type, and infrared Type). These various types of touch panels are employed in electronic products in consideration of problems of signal amplification, differences in resolution, difficulty in design and processing technology, optical characteristics, electrical characteristics, mechanical characteristics, environmental characteristics, input characteristics, durability and economical efficiency Currently, the most widely used methods are resistive touch panels and capacitive touch panels.

In such a touch panel, an electrode pattern is usually formed of indium tin oxide (ITO). However, in the case of ITO, not only the electrical conductivity is low, but the indium (raw material) is expensive as a rare earth metal, and it is expected to be exhausted within the next 10 years. In addition, the electrode pattern formed of ITO is susceptible to brittle fracture, and thus has a problem of poor durability.

For this reason, as disclosed in Korean Patent Laid-Open Publication No. 10-2010-0091497, studies are being actively conducted to form electrode patterns using metals. However, there is a situation in which an electrode pattern forming method that can be used by satisfying both electrical conductivity and durability while using metal has not been developed.

The present invention has been made to solve the above problems, an object of the present invention is to produce an electrode pattern containing silver by exposing / developing the silver salt emulsion layer, replacing the ITO, but excellent electrical conductivity manufacturing method It is to provide.

Method for manufacturing a touch panel according to a preferred embodiment of the present invention comprises the steps of (A) forming an optical filter layer to selectively block the light on one or both sides of the window that is provided on the outermost, (B) one surface of the window Forming a silver salt emulsion layer on the optical filter layer and the other surface of the window, and forming the silver salt emulsion layer on the optical filter layer when the optical filter layer is formed on both surfaces of the window; C) selectively exposing / developing the silver salt emulsion layer to form a first electrode pattern and a second electrode pattern containing silver on both sides of the window.

Here, after the step (C), further comprising the step of forming a protective layer covering the first electrode pattern.

In addition, the protective layer is characterized in that the hard coating layer, optically transparent adhesive or AR coating layer.

In addition, the hard coating layer is characterized in that formed of acrylic (Acrylic), epoxy (Epoxy), urethane (Urethane) or a combination thereof.

The method may further include forming a first wiring connected to the first electrode pattern on one surface of the window and forming a second wiring connected to the second electrode pattern on the other surface of the window.

The first wiring may be formed by selectively exposing / developing the silver salt emulsion layer to contain silver, and integrally formed with the first electrode pattern, and the second wiring may be selectively exposed / developed by the silver salt emulsion layer. It is formed, containing silver, and is formed integrally with the second electrode pattern.

The method may further include providing a control unit in the window, wherein the first wire and the second wire are connected to the control unit.

The control unit may include a first control unit provided on one surface of the window, and a second control unit provided on the other surface of the window, wherein the first wiring is connected to the first control unit, and the second wiring is And is connected to the second control unit.

In addition, after the step (C), characterized in that it further comprises the step of forming a printing unit covering the first wiring.

Further, in the step (B), the silver salt emulsion layer is characterized in that it comprises a silver salt and a binder.

In addition, the silver salt is characterized in that the silver halide.

Further, in the step (A), the optical filter layer is characterized in that blocking the ultraviolet rays.

In addition, in the step (A), the optical filter layer is characterized in that blocking the I-line, H-line or G-line in the ultraviolet.

In addition, in the step (A), the optical filter layer is characterized in that the inorganic material for blocking UV.

Further, in the step (A), the optical filter layer is characterized in that formed with an organic material for UV blocking.

In addition, in the step (C), the silver salt emulsion layer is exposed using a proximity exposure machine or a contact exposure machine.

In addition, the sheet resistance of the first electrode pattern or the sheet resistance of the second electrode pattern is characterized in that less than 150Ω / □.

In addition, the sheet resistance of the first electrode pattern or the sheet resistance of the second electrode pattern is characterized in that 0.1 to 50Ω / □.

In addition, the line width of the fine pattern of the first electrode pattern or the line width of the fine pattern of the second electrode pattern is characterized in that 3 to 7μm.

In addition, the transmittance of the touch panel is characterized in that more than 85%.

In addition, the aperture ratio of the first electrode pattern or the aperture ratio of the second electrode pattern may be 95% or more.

In addition, the thickness of the first electrode pattern or the thickness of the second electrode pattern is characterized in that less than 2μm.

The line width of the first wiring or the line width of the second wiring is 50 µm or less.

The pitch of the first wiring or the pitch of the second wiring is 50 μm or less.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, by forming an electrode pattern containing silver by exposing / developing the silver salt emulsion layer, it is possible not only to implement excellent electrical conductivity while replacing ITO, but also to secure excellent durability without causing brittle fracture. There is this.

In addition, according to the present invention, even if the exposure to the silver salt emulsion layer formed on both sides of the window, by using the optical filter layer, there is an effect that it is possible to prevent affecting the silver salt emulsion layer formed on the opposite surface.

In addition, according to the present invention, by forming the electrode pattern directly on both sides of the window provided on the outermost side of the touch panel, the process of forming the electrode pattern on a separate transparent substrate and then attaching to the window can be omitted to simplify the manufacturing process It is possible to reduce the overall thickness of the touch panel.

1A to 1B are cross-sectional views of a touch panel according to a preferred embodiment of the present invention;
2A to 2B are plan views of a protective layer and a printed part removed from a touch panel according to an exemplary embodiment of the present invention;
3A to 3D are enlarged plan views of fine patterns of the first and second electrode patterns illustrated in FIG. 1A;
4 to 6 are plan views of first and second electrode patterns of a touch panel according to an exemplary embodiment of the present invention; And
7 to 13 are process cross-sectional views illustrating a manufacturing method of a touch panel according to a preferred embodiment of the present invention in the order of manufacturing process.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In addition, terms such as “first” and “second” are used to distinguish one component from another component, and the component is not limited by the terms. In the following description of the present invention, a detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A to 1B are cross-sectional views of a touch panel according to a preferred embodiment of the present invention, and FIGS. 2A to 2B are plan views of a protective layer and a printed part removed from the touch panel according to a preferred embodiment of the present invention.

1 to 2, the touch panel 100 according to the present embodiment includes a window 110, a first electrode pattern 120, a second electrode pattern 130, and an optical filter layer 140. It is a constitution.

The window 110 serves to provide a region in which the first electrode pattern 120 and the second electrode pattern 130 are to be formed, and is a support provided at the outermost side of the touch panel 100. Here, the window 110 should have a supporting force capable of supporting the first electrode pattern 120 and the second electrode pattern 130 and transparency for allowing a user to recognize an image provided by the image display apparatus. In view of the above-mentioned support and transparency, the window 110 is made of polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyether sulfone (PES), Cyclic olefin polymer (COC), Triacetylcellulose (TAC) film, Polyvinyl alcohol (PVA) film, Polyimide (PI) film, Polystyrene (PS), Biaxially oriented polystyrene (K resin-containing biaxially oriented) PS, BOPS), glass or tempered glass, etc., but is not necessarily limited thereto.

Meanwhile, first and second electrode patterns 120 and 130 are directly formed on both surfaces of the window 110. Therefore, the process of attaching the electrode pattern to the window 110 after the electrode pattern is formed on a separate transparent substrate can be omitted, thereby simplifying the manufacturing process and reducing the overall thickness of the touch panel 100.

The first electrode pattern 120 and the second electrode pattern 130 serve to generate a signal when a user touches the controller 190 so that the controller 190 can recognize the touch coordinates. ) Is formed on one surface of the window 110, and the second electrode pattern 130 is formed on the other surface of the window 110. Here, the fine pattern of the first electrode pattern 120 and the fine pattern of the second electrode pattern 130 are formed by selectively exposing / developing the silver salt emulsion layer 150 (containing red). ).

In addition, the first wiring 160 and the second wiring 170 are connected to the first electrode pattern 120 and the second electrode pattern 130, respectively, and serve to receive electrical signals. ) Is formed on one surface of the window 110, and the second wiring 170 is formed on the other surface of the window 110. Here, the first wiring 160 and the second wiring 170 may be formed by selectively exposing / developing the silver salt emulsion layer 150 (containing red). In this case, the first wiring 160 is integrally formed with the first electrode pattern 120, and the second wiring 170 is integrally formed with the second electrode pattern 130. In this way, the first wiring 160 is integrally formed with the first electrode pattern 120, and the second wiring 170 is integrally formed with the second electrode pattern 130, thereby simplifying the manufacturing process. The lead time can be shortened. In addition, since the bonding process between the first and second wirings 160 and 170 and the first and second electrode patterns 120 and 130 may be omitted, the first and second wirings 160 and 170 and the first and second electrode patterns may be omitted. There is an effect that can prevent the problem of step difference or poor bonding between (120, 130) in advance. However, the first and second wirings 160 and 170 are not necessarily formed integrally with the first and second electrode patterns 120 and 130 by exposing / developing the silver salt emulsion layer 150. , Organic silver may be formed separately from the first and second electrode patterns 120 and 130 using a conductive polymer, carbon black (including CNTs), metal oxides, or metals.

In addition, as illustrated in FIG. 2B, the window 110 may include a controller 190 which is a kind of controller. In this case, the first wiring 160 and the second wiring 170 are directly connected to the control unit 190 provided in the window 110. As such, since the first wiring 160 and the second wiring 170 are directly connected to the controller 190 provided in the window 110, the conventional flexible printed circuit board may be omitted. For example, the controller 190 may include a first control unit 195 provided on one surface of the window 110 and a second control unit 197 provided on the other surface of the window 110. In this case, the first wire 160 is connected to the first control unit 195, and the second wire 170 is connected to the second control unit 197.

Meanwhile, the silver salt emulsion layer 150 forming the first and second electrode patterns 120 and 130 and the first and second wirings 160 and 170 may be formed of silver salt 153 (see FIG. 8A or FIG. 8B) and the binder 155. Include. The silver salt 153 may be an inorganic silver salt such as silver halide (AgCl, AgBr, AgF, AgI), or an organic silver salt such as silver acetate. In addition, the binder 155 uniformly disperses the silver salt 153 and enhances the adhesive force between the silver salt emulsion layer 150 and the optical filter layer 140 or between the silver salt emulsion layer 150 and the window 110, gelatin, Polysaccharides such as polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), starch, cellulose and its derivatives, polyethylene oxide, polyvinylamine, chitosan, polylysine, polyacrylic acid, polyalginic acid, polyhyaluronic acid, carboxycellulose And the like. The binder 155 has neutral, anionic and cationic properties depending on the ionicity of the functional group.

In addition to the silver salt 153 and the binder 155, the silver salt emulsion layer 150 may further include additives such as a solvent or a dye. Specifically, the solvent includes water, an organic solvent (for example, alcohols such as methanol, ketones such as acetone, amides such as formamide, sulfoxides such as dimethylsulfoxide, esters such as ethyl acetate, ethers Etc.), ionic liquids, and mixtures thereof.

On the other hand, the sheet resistance of the first electrode pattern 120 or the sheet resistance of the second electrode pattern 130 may be 150 Ω / □ or less to suit the touch panel 100 by adjusting the thickness or by adjusting the silver content of the silver salt emulsion layer 150. have. More specifically, the sheet resistance of the first and second electrode patterns 120 and 130 may be 0.1 to 50Ω / □. Here, the reason for forming the sheet resistance of the first and second electrode patterns 120 and 130 to 0.1 to 50 Ω / □ is the silver salt 153 when the sheet resistance of the first and second electrode patterns 120 and 130 is 0.1 Ω / □ or less. This is because transparency may be impaired due to too much amount, and when the sheet resistance of the first and second electrode patterns 120 and 130 is 50 Ω / □ or more, the electrical conductivity is low and the utilization thereof is lowered. However, the sheet resistance of the first and second electrode patterns 120 and 130 is not necessarily limited to the above numerical values.

3A to 3D are enlarged plan views of the fine patterns of the first and second electrode patterns illustrated in FIG. 1A. Referring to this, FIGS. Let's take a look. As shown in FIG. 3A, the line width W of the fine patterns of the first and second electrode patterns 120 and 130 is preferably 3 μm or more in order to prevent the sheet resistance from becoming too high, and is prevented from being visually identified to the user. In order to do this, it is preferable that it is 7 micrometers or less. As a result, the line width W of the fine patterns of the first and second electrode patterns 120 and 130 is preferably 3 to 7 μm, but is not necessarily limited thereto.

In addition, the fine pattern of the first electrode pattern 120 and the fine pattern of the second electrode pattern 130 may be rectangular (see FIG. 3A), rhombus (see FIG. 3B), circular (see FIG. 3C), or ellipse (see FIG. 3D). ) May be a repeated mesh structure. That is, all of the fine patterns of the first and second electrode patterns 120 and 130 may have a mesh structure intersecting with the lattice pattern.

Meanwhile, as shown in the enlarged view of FIG. 2A, the line width X and the pitch P of the first and second wirings 160 and 170 may be 50 μm or less, respectively.

4 to 6 are plan views of the first and second electrode patterns of the touch panel according to the preferred embodiment of the present invention. As shown in FIGS. 4 to 6, the first electrode pattern 120 and the second electrode pattern 130 may be a bar type (see FIG. 4), a tooth type (see FIG. 5), or a diamond type. (Diamond Type, see FIG. 6).

In detail, the first electrode pattern 120 and the second electrode pattern 130 may be patterned into a bar type (see FIG. 4). In this case, the first electrode pattern 120 and the second electrode pattern 130 may be formed in the vertical direction. In addition, if necessary, any one of the first electrode pattern 120 and the second electrode pattern 130 may be patterned into a bar having a relatively large width, and the other may be patterned into a bar having a relatively small width ( Typically defined as Bar and Strip Type).

In addition, the first electrode pattern 120 and the second electrode pattern 130 may be patterned in a tooth type (see FIG. 5). In this case, the first electrode pattern 120 and the second electrode pattern 130 are formed of a plurality of triangles parallel to one direction. In addition, the first electrode pattern 120 is inserted between the second electrode pattern 130 and the second electrode pattern 130 so that the first electrode pattern 120 and the second electrode pattern 130 do not overlap each other. It may be formed to be inserted into the first electrode pattern 120.

In addition, the first electrode pattern 120 and the second electrode pattern 130 may be patterned into a diamond type (see FIG. 6). In this case, the first electrode pattern 120 and the second electrode pattern 130 are composed of the sensing units 137a and 137b and the connecting portions 139a and 139b, and the first electrode pattern 120 through the connecting portions 139a and 139b. ) And the second electrode pattern 130 may be connected to each other in a vertical direction. In addition, the sensing unit 137a of the first electrode pattern 120 and the sensing unit 137b of the second electrode pattern 130 may be disposed so as not to overlap each other.

However, as described above, patterning the first electrode pattern 120 and the second electrode pattern 130 into a bar shape, a tooth shape, or a diamond shape is exemplary, but is not limited thereto. ) And the second electrode pattern 130 may be patterned in any pattern known in the art.

In addition, the thickness of the first electrode pattern 120 or the thickness of the second electrode pattern 130 is not particularly limited, but may be 10 μm or less to secure an appropriate transmittance, and more preferably 2 μm or less.

Meanwhile, the first electrode pattern 120 and the second electrode pattern 130 are formed by selectively exposing / developing the silver salt emulsion layer 150, and when exposing the silver salt emulsion layer 150, a proximity exposure machine or a contact. A contact exposure machine may be used, which will be described later in the manufacturing method.

In addition, since the window 110 (refer to FIG. 1A or FIG. 1B) is a support provided on the outermost side of the touch panel 100, the first electrode pattern 120 formed on the upper surface of the window 110 may be connected to the input means 197. In order to prevent direct contact, the protective layer 190 may be provided. That is, the protective layer 190 serves to protect the first electrode pattern 120 and is formed on the first electrode pattern 120. Here, the protective layer 190 may be a hard coating layer (Hard Coating Layer), an optical clear adhesive (OCA) or AR coating layer (Anti Reflect Coating Layer), the hard coating layer is acrylic (Acrylic), epoxy ( Epoxy), urethane (Urethane) or a combination thereof may be formed.

In addition, the printing unit 195 covering the first wire 160 may be formed to cover the first wire 160 or to display a logo. Here, the printing unit 195 may be formed using screen printing or sputtering. Among them, when the printing unit 195 is formed by using a sputter, the thickness of the printing unit 195 may be thinly formed to a nanometer unit.

The optical filter layer 140 selectively blocks (reflects or absorbs) light so that the silver salt emulsion layer 150 formed on opposite surfaces may be affected even when the silver salt emulsion layer 150 formed on both sides of the window 110 is exposed. It serves to prevent giving. Here, the optical filter layer 140 is formed on at least one of one surface of the window 110 and the first electrode pattern 120, and the other surface of the window 110 and the second electrode pattern 130. That is, the optical filter layer 140 is formed on both sides of the window 110 (see FIG. 1A) or is formed on one side (see FIG. 1B).

Specifically, the optical filter layer 140 selectively blocks the light irradiated when the silver salt emulsion layer 150 is exposed. Therefore, the light blocked by the optical filter layer 140 is determined in consideration of the light irradiated during exposure. Here, the light irradiated during exposure can be any wavelength such as visible light, ultraviolet light, X-ray, etc., if the ultraviolet light (wavelength of about 10 to 397nm) is irradiated during exposure, the optical filter layer 140 is formed to selectively block the ultraviolet light. . More specifically, if the I-line (wavelength is 365nm), H-line (405nm) or G-line (436nm) is irradiated in the ultraviolet during exposure, the optical filter layer 140 is I-line, H-line or G- It is formed to selectively block only the line. As such, by selectively blocking the light irradiated during the exposure of the optical filter layer 140, it may be prevented from affecting the silver salt emulsion layer 150 formed on opposite surfaces. In addition, since the optical filter layer 140 passes most of the light except the light irradiated at the time of exposure, the optical filter layer 140 has substantially transparency and does not lower the visibility of the touch panel 100.

On the other hand, the optical filter layer 140 may be formed of a UV blocking inorganic material or UV blocking organic material. Here, the UV blocking inorganic material may be a metal oxide such as indium tin oxide and titanium dioxide, and the UV blocking organic material may be benzophenone, benzotriazole, or salicylic acid. (Salicylic Acid), acrylonitrile, organic nickel compounds, and the like. However, the above-described materials are exemplary, and the scope of the present invention is not limited thereto.

Meanwhile, as described above, the touch panel 100 including the window 110, the first electrode pattern 120, the second electrode pattern 130, and the optical filter layer 140 may display an image provided by the image display device. The transmittance is preferably 85% or more so that the user can recognize it. In addition, in order to implement the transmittance of the touch panel 100 to 85% or more, the aperture ratios of the first electrode pattern 120 and the second electrode pattern 130 may be adjusted. In this case, the opening ratio of the first electrode pattern 120 or the second electrode pattern 130 may be 95% or more.

In addition, since the first electrode pattern 120 and the second electrode pattern 130 are formed on both surfaces of the touch panel 100 according to the present invention, a self capacitive type touch is performed. It can be used as a panel or a mutual capacitive type touch panel.

7 to 13 are process cross-sectional views illustrating a manufacturing method of a touch panel according to a preferred embodiment of the present invention in the order of manufacturing process.

As shown in Figure 7 to Figure 13, the manufacturing method of the touch panel 100 according to the present embodiment (A) to selectively block the light on one or both sides of the window 110, which is a support provided on the outermost side Forming the optical filter layer 140, (B) when the optical filter layer 140 is formed on one surface of the window 110, the silver salt emulsion layer 150 is formed on the other surface of the optical filter layer 140 and the window 110 When the optical filter layer 140 is formed on both sides of the window 110, forming the silver salt emulsion layer 150 on the optical filter layer 140, and (C) selectively exposing / developing the silver salt emulsion layer 150. Forming a first electrode pattern 120 and a second electrode pattern 130 containing silver on both sides of the window 110.

First, as shown in FIG. 7A or 7B, the optical filter layer 140 is formed in the window 110. Here, the optical filter layer 140 serves to prevent affecting the silver salt emulsion layer 150 formed on opposite surfaces by selectively blocking light when the silver salt emulsion layer 150 is exposed in a step to be described later. Therefore, the optical filter layer 140 determines the light to be blocked in consideration of the light used during exposure. The light irradiated at the time of exposure may be any wavelength such as visible light, ultraviolet light, X-ray, etc., and if the ultraviolet light (wavelength is about 10 to 397 nm) is applied at the time of exposure, the optical filter layer 140 is formed to selectively block the ultraviolet light. More specifically, if the I-line (wavelength is 365nm), H-line (405nm) or G-line (436nm) is irradiated in the ultraviolet during exposure, the optical filter layer 140 is I-line, H-line or G- It is formed to selectively block only the line.

As such, in order to block ultraviolet rays, I-lines, H-lines, or G-lines with the optical filter layer 140, the optical filter layer 140 may be formed of an inorganic material for UV blocking or an organic material for UV blocking. Specifically, the UV blocking inorganic material may be a metal oxide such as indium tin oxide, titanium dioxide, and the like. The organic material for UV blocking may be benzophenone, benzotriazole, Salicylic acid, acrylonitrile, organic nickel compounds, and the like. On the other hand, in the case of using an inorganic material for UV blocking as the optical filter layer 140, the optical filter layer 140 may be formed by sputtering, evaporation, and the like. In addition, in the case of using the organic material for UV blocking as the optical filter layer 140, the optical filter layer 140 is die casting, screen printing, gravure printing, offset printing (Off- It may be formed by set Pringting, Bar Coating, or the like.

On the other hand, even if the optical filter layer 140 is formed only on at least one of the one surface or the other surface of the window 110 to block the light when exposing the silver salt emulsion layer 150 affects the silver salt emulsion layer 150 formed on the opposite surface each other. It can prevent. Therefore, as shown in FIG. 7A, the optical filter layer 140 does not necessarily need to be formed on both surfaces of the window 110, but may be formed only on at least one surface or the other surface of the window 110 as shown in FIG. 7B. It may be. Hereinafter, FIGS. 8A, 9A, 10A, 11A, 12A, and 13A are views based on the configuration in which the optical filter layer 140 is formed on both surfaces of the window 110, and FIGS. 8B, 9B, and FIG. 10B, 11B, 12B, and 13B illustrate the configuration in which the optical filter layer 140 is formed on one surface of the window 110.

Next, as shown in FIG. 8A or 8B, the silver salt emulsion layer 150 is formed. When the optical filter layer 140 is formed on both surfaces of the window 110 in the above-described step, the silver salt emulsion layer 150 is formed on the optical filter layer 140 formed on both surfaces of the window 110 (see FIG. 8A). When the optical filter layer 140 is formed on one surface of the 110, the silver salt emulsion layer 150 is formed on the other surface of the optical filter layer 140 and the window 110 (see FIG. 8B). Here, the silver salt emulsion layer 150 includes a silver salt 153 and a binder 155. Specifically, the silver salt 153 may be an inorganic silver salt such as silver halide (AgCl, AgBr, AgF, AgI) or an organic silver salt such as silver acetate. In addition, the binder 155 is gelatin, polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), polysaccharides such as starch, cellulose and its derivatives, polyethylene oxide, polyvinylamine, chitosan, polylysine, polyacrylic acid , Polyalginic acid, polyhyaluronic acid, carboxycellulose and the like. For reference, silver salt 153 in the drawings is exaggerated for clarity of understanding and does not represent actual size or concentration. In addition to the silver salt 153 and the binder 155, the silver salt emulsion layer 150 may further include additives such as a solvent or a dye.

Meanwhile, the silver salt emulsion layer 150 is formed using die casting, screen printing, gravure printing, offset printing, and bar coating. can do. In addition, after the silver salt emulsion layer 150 is formed, the silver salt emulsion layer 150 may be dried by thermal drying, IR drying or natural drying.

Next, as shown in FIGS. 9 to 11, the silver salt emulsion layer 150 is selectively exposed / developed to form the first electrode pattern 120 and the second electrode pattern 130 containing silver. . That is, the first electrode pattern 120 is formed on one side of the window 110 and the second electrode pattern 130 is formed on the other side of the window 110.

Specifically, as shown in FIG. 9A or 9B, the silver salt emulsion layer 150 is selectively exposed. Since the silver salt emulsion layer 150 is formed on both sides of the window 110 in the above-described step, the exposure is performed on both sides of the window 110 in this step. In this case, the exposure may be simultaneously performed at both sides with respect to the window 110, or may be sequentially performed one by one. On the other hand, the light irradiated during exposure can be any wavelength, such as visible light, ultraviolet rays, X-rays, ultraviolet rays can usually be used. More specifically, the high-pressure mercury discharge can be exposed using I-line (365 nm), H-line (405 nm) or G-line (436 nm), which has a large relative intensity. A relatively short wavelength I-line can be selected.

In this step, if the mask 180 is disposed on both sides of the window 110 and selectively irradiates light to the silver salt emulsion layer 150, the silver salt 153 is light in the silver salt emulsion layer 150 of the irradiated portion. Photosensitized by energy produces a fine silver nucleus, defined as a so-called latent image. As a result, silver nuclei are selectively generated only in portions irradiated with light through exposure. As such, the first electrode pattern 120, the first wiring 160, the second electrode pattern 130, and the second wiring 170 are finally formed in the portion irradiated with light. Therefore, in this step, the first electrode pattern 120, the first wiring 160, the second electrode pattern 130, and the second wiring 170 to be implemented should be selectively exposed.

On the other hand, as described above, even if the exposure from both sides relative to the window 110, the optical filter layer 140 blocks the light irradiated during exposure (see arrow), the silver salt emulsion layer 150 is the window 110 It is not affected by the light irradiated from the opposite side. Therefore, even if the fine patterns of the first electrode pattern 120 and the second electrode pattern 130 to be finally formed are different, the silver salt emulsion layer 150 may be exposed to light on the opposite side of the window 110 during exposure. Since it is not affected, the first electrode pattern 120 and the second electrode pattern 130 can be formed precisely.

In addition, when exposing the silver salt emulsion layer 150, a proximity exposure machine or a contact exposure machine may be used. A proximity exposure machine or a contact exposure machine may have a relatively tact time. Short) not only improves productivity, but also has the advantage of being suitable for mass production.

Next, as shown in FIG. 10A or 10B, the silver salt emulsion layer 150 is developed. In this step, the developer is supplied to the silver salt emulsion layer 150 to reduce the metal silver 157. At this time, the silver ions provided from the silver salt 153 or the developer are reduced to the metal silver 157 using the silver nucleus as a catalyst by the reducing agent in the developer. Since the silver nucleus was selectively generated only in the portion irradiated with light in the above-described step, the metal silver 157 is selectively reduced only in the portion irradiated with light in this step.

On the other hand, the method for supplying the developer to the silver salt emulsion layer 150 may use any method known in the art. For example, the silver salt emulsion layer 150 is immersed in the developer, or the developer is sprayed onto the silver salt emulsion layer 150 by spraying, or the developer is contacted with the silver salt emulsion layer 150 in the form of a vapor by the method. The developer can be supplied.

In addition, after the silver salt emulsion layer 150 is developed, the developer may be removed using water or high pressure air.

Next, as shown in FIG. 11A or 11B, the fixing process is performed on the silver salt emulsion layer 150. Here, the fixing process is to remove the silver salt 153 that is not reduced to silver by supplying a fixing solution to the silver salt emulsion layer 150. As such, when the silver salt 153 that is not reduced to silver is removed, only a binder 155 such as gelatin remains in the portion where the silver salt 153 is removed.

As a result, a portion of the silver salt emulsion layer 150 that is reduced to the metallic silver 157 through exposure / development is formed by the first electrode pattern 120, the first wiring 160, the second electrode pattern 130, and the second wiring ( 170), the portion from which the silver salt 153 has been removed through the fixing process remains transparent only the binder 155 remains.

As described above, after the silver salt emulsion layer 150 is selectively exposed / developed, the first electrode pattern 120 and the first wiring 160 connected to the first electrode pattern 120 may be formed through a fixing process. The second wire 170 connected to the second electrode pattern 130 and the second electrode pattern 130 can be formed. In this case, the first wiring 160 is integrally formed with the first electrode pattern 120, and the second wiring 170 is integrally formed with the second electrode pattern 130.

However, the first and second wirings 160 and 170 are not necessarily formed integrally with the first and second electrode patterns 120 and 130 by exposing / developing the silver salt emulsion layer 150. The organic silver may be formed separately from the first and second electrode patterns 120 and 130 by using a conductive polymer, carbon black (including CNT), metal oxides or metals. In this case, the first and second wirings 160 and 170 may be formed using a screen printing method, a gravure printing method, an inkjet printing method, or the like.

Next, as shown in FIG. 12A or 12B, the printing unit 195 covering the first wiring 160 is formed. Here, the printing unit 195 covers the first wiring 160 or displays a logo. The printing unit 195 may be formed by using a screen printing method or a sputter.

Next, as shown in FIG. 13A or 13B, the protecting layer 190 is formed on the first electrode pattern 120. Here, the protective layer 190 is to protect the first electrode pattern 120 so that the first electrode pattern 120 is not in direct contact with the input means 197, the hard coating layer (Hard Coating Layer), the optical transparent adhesive ( Optical Clear Adhesive (OCA) or AR Reflective Layer (Anti Reflect Coating Layer). At this time, the hard coating layer may be formed of acrylic (Acrylic), epoxy (Epoxy), urethane (Urethane) or a combination thereof. In addition, the protective layer 190 may be laminated on the first electrode pattern 120 in the form of a film, or may be coated in a liquid state by using spin coating.

On the other hand, as shown in Figure 2b, the manufacturing method of the touch panel 100 according to the present embodiment may further include providing a control unit 190 which is a kind of controller in the window (110). . In this case, the first wiring 160 and the second wiring 170 are directly connected to the controller 190 provided in the window 110. As such, since the first wiring 160 and the second wiring 170 are directly connected to the controller 190 provided in the window 110, the conventional flexible printed circuit board may be omitted. For example, the controller 190 may include a first control unit 195 provided on one surface of the window 110 and a second control unit 197 provided on the other surface of the window 110. In this case, the first wire 160 is connected to the first control unit 195, and the second wire 170 is connected to the second control unit 197.

Although the present invention has been described in detail through specific embodiments, this is for explaining the present invention in detail, and the manufacturing method of the touch panel according to the present invention is not limited thereto. It is clear that modifications and improvements are possible by those with knowledge of the world. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: touch panel 110: window
120: first electrode pattern 130: second electrode pattern
137a, 137b: detection part 139a, 139b: connection part
140: optical filter layer 150: silver salt emulsion layer
153: silver salt 155: binder
157: metal silver 160: first wiring
170: second wiring 180: mask
190: protective layer 195: printing unit
197: input means W: line width of fine pattern
X: line width of the first and second wirings P: pitch of the first and second wirings

Claims (24)

(A) forming an optical filter layer to selectively block light on one or both sides of the window that is the support provided on the outermost side;
(B) when the optical filter layer is formed on one surface of the window, a silver salt emulsion layer is formed on the optical filter layer and the other surface of the window, and when the optical filter layer is formed on both surfaces of the window, the silver salt emulsion layer on the optical filter layer. Forming a; And
(C) selectively exposing / developing the silver salt emulsion layer to form first and second electrode patterns containing silver on both sides of the window;
Method of manufacturing a touch panel comprising a.
The method according to claim 1,
After the step (C),
Forming a protective layer covering the first electrode pattern;
Method of manufacturing a touch panel further comprising.
The method according to claim 2,
The protective layer is a manufacturing method of the touch panel, characterized in that the hard coating layer, optically transparent adhesive or AR coating layer.
The method according to claim 3,
The hard coating layer is a method of manufacturing a touch panel, characterized in that formed of acrylic (Acrylic), epoxy (Epoxy), urethane (Urethane) or a combination thereof.
The method according to claim 1,
Forming a first wiring connected to the first electrode pattern on one surface of the window, and forming a second wiring connected to the second electrode pattern on the other surface of the window;
Method of manufacturing a touch panel further comprising.
The method according to claim 5,
The first wiring is formed by selectively exposing / developing the silver salt emulsion layer to contain silver, and is integrally formed with the first electrode pattern.
And wherein the second wiring is formed by selectively exposing / developing the silver salt emulsion layer to contain silver and integrally formed with the second electrode pattern.
The method according to claim 5,
Providing a control unit in the window;
Further comprising:
And the first wiring and the second wiring are connected to the control unit.
The method of claim 7,
The control unit,
A first control unit provided on one surface of the window; And
A second control unit provided on the other surface of the window;
Lt; / RTI >
The first wiring is connected to the first control unit,
And wherein the second wiring is connected to the second control unit.
The method according to claim 5,
After the step (C),
Forming a printing unit covering the first wiring;
Method of manufacturing a touch panel further comprising.
The method according to claim 1,
In the step (B)
The silver salt emulsion layer is a touch panel manufacturing method comprising a silver salt and a binder.
The method of claim 10,
The silver salt is a manufacturing method of the touch panel, characterized in that the silver halide.
The method according to claim 1,
In the step (A)
The optical filter layer is a manufacturing method of the touch panel, characterized in that blocking the ultraviolet rays.
The method according to claim 1,
In the step (A)
The optical filter layer is a manufacturing method of a touch panel, characterized in that to block the I-line, H-line or G-line in the ultraviolet.
The method according to claim 1,
In the step (A)
The optical filter layer is a manufacturing method of the touch panel, characterized in that formed with inorganic UV blocking.
The method according to claim 1,
In the step (A)
The optical filter layer is a manufacturing method of a touch panel, characterized in that formed with organic UV blocking.
The method according to claim 1,
In the step (C),
A method of manufacturing a touch panel, comprising exposing the silver salt emulsion layer using a proximity exposure machine or a contact exposure machine.
The method according to claim 1,
The sheet resistance of the first electrode pattern or the sheet resistance of the second electrode pattern is 150Ω / □ or less method of manufacturing a touch panel.
The method according to claim 1,
The sheet resistance of the first electrode pattern or the sheet resistance of the second electrode pattern is 0.1 to 50Ω / □ method of manufacturing a touch panel.
The method according to claim 1,
The line width of the fine pattern of the first electrode pattern or the line width of the fine pattern of the second electrode pattern is 3 to 7μm manufacturing method of the touch panel.
The method according to claim 1,
The transmittance of the touch panel is a manufacturing method of the touch panel, characterized in that more than 85%.
The method according to claim 1,
The aperture ratio of the first electrode pattern or the aperture ratio of the second electrode pattern is 95% or more.
The method according to claim 1,
The thickness of the first electrode pattern or the thickness of the second electrode pattern is a manufacturing method of the touch panel, characterized in that 2μm or less.
The method according to claim 5,
The line width of the first wiring or the line width of the second wiring is 50 μm or less.
The method according to claim 5,
The pitch of the first wiring or the pitch of the second wiring is 50μm or less manufacturing method of the touch panel.

Images