KR20110041300A - Electrostatic capacity touch panel and method for manufacturing thereof - Google Patents

Abstract

PURPOSE: An electrostatic capacity touch panel and a method for manufacturing the same are provided to supply improved sensitivity and transmittance by minimizing the user of an adhesive film and a resin film. CONSTITUTION: A first panel(10) includes a window sheet(11), and a transparent conductive film(12) laminated on the window sheet. A second panel(20) includes a base panel(21), and a second transparent conductive film(22) laminated on the base panel. An adhesive layer(30) bonds the first panel to the second panel by placing the transparent conductive film between the panels. A transparent coating film is laminated between the window sheet and the first transparent conductive film. The conductive film on which the transparent insulating film and the transparent conductive film are sequentially laminated is laminated the first and/or second transparent conductive films.

Description

Capacitive touch panel and its manufacturing method {ELECTROSTATIC CAPACITY TOUCH PANEL AND METHOD FOR MANUFACTURING THEREOF}

The present invention relates to a capacitive touch panel which is one of information input devices of various electric and electronic devices, and a manufacturing method thereof.

The touch panel is a new information input method that can replace the information input method using a mouse, a keyboard, a remote controller, and the like, and directly inputs information on a screen of an electric or electronic device using a hand or a pen.

These touch panels can be easily operated by anyone, while the user directly performs the desired tasks while viewing the screen, and is evaluated as the most ideal information input method under a GUI (Graphical User Interface) environment. Currently, mobile phones, PDAs, banks, and government offices It is widely used in various fields such as medical, medical equipment, tourism, and guidance of major organizations.

Such a touch panel uses a resistive film type, a capacitive type, an infrared type, an ultrasonic type, and the like, and a resistive type has been used so far, but in order to minimize the thickness, the capacitive type is excellent and widely used. to be.

1 is an exploded view schematically showing the structure of a typical capacitive touch panel. As shown in FIG. 1, a general touch panel includes a window sheet 1, an upper panel 3, a lower panel 5, and a base panel 7.

 Although not shown, the window sheet 1 has a structure in which a printing layer is formed on a resin film, and the upper panel 3 and the lower panel 5 are formed of ITO (ITO) as a conductive film on the resin films 3a and 5a, respectively. 3b and 5b) are laminated. The resin films 3a and 5a may be PET films, and the base panel 7 may be made of glass, PMMA, or PC.

As described above, the window sheets 1, the upper panel 3, the lower panel 5, and the base panel 7, which are manufactured, are respectively bonded by using the first to third adhesive layers 2, 4, and 6, respectively. It is manufactured by connecting the electrodes with each other by wiring. As the first to third adhesive layers 2, 4 and 6, an optically clear adhesive or the like is used.

However, the general touch panel as described above has a problem in that the thickness is increased by using three adhesive layers 2, 4 and 6 and two resin films 3a and 5a, resulting in low sensitivity and low transmittance.

In addition, since a general touch panel is required to adhere the window sheet 1, the upper and lower panels 3 and 5, and the base panel 7 to the adhesive layers 2, 4 and 6, a plurality of touch panels are required. There is a problem that the work efficiency is reduced, such as the increase in the number of work due to the bonding work.

In addition, it is inevitable that a process defect occurs due to a plurality of bonding operations, and in particular, a thickness variation may occur due to a plurality of adhesive layers, and in addition, the overall appearance of the touch panel may be poor due to the incorporation of foreign substances and voids and wrinkles between resin films. There is a problem such as a significant drop in the overall process yield.

The present invention has been made in view of the above problems, and by minimizing the use of the adhesive layer and the resin film to reduce the number of work, the capacitive touch panel and the manufacturing that can be achieved to reduce the cost and improve the yield due to defective rate reduction The purpose is to provide a method.

Another object of the present invention is to provide a capacitive touch panel and a method of manufacturing the same, which can realize a high reliability touch panel due to improvement in sensitivity and transmittance by minimizing the use of an adhesive layer and a resin film.

A touch panel according to the present invention for achieving the above object comprises a first panel having a window sheet and a first transparent conductive film laminated on the window sheet; A second panel having a base panel and a second transparent conductive film laminated on the base panel; And an adhesive layer for bonding the first panel and the second panel to face the transparent conductive film.

A transparent coating layer may be stacked between the window sheet and the first transparent conductive film.

At least one conductive layer in which a transparent insulating film and a transparent conductive film are sequentially stacked may be laminated on all or one of the first transparent conductive film and the second transparent conductive film.

The window sheet further includes a film and a printing layer formed on the film, and the film may be composed of a resin film or a glass film.

In addition, the transparent conductive film may be formed of ITO.

In addition, the adhesive layer may use an optical clear adhesive (OCA) or a transparent double-sided adhesive tape.

The base panel may be formed of tempered glass, PMMA and PC.

The transparent coating layer may be selected from BCB or polyimide.

The transparent insulating film may be selected from OXIDE, BCB, or polyimide.

According to an aspect of the present invention, there is provided a method of manufacturing a touch panel, comprising: (a) forming a first panel by laminating a first transparent conductive film on a window sheet having a glass or resin film and a printing layer formed on the film; (b) forming a second panel by laminating a second transparent conductive film on the base panel; And (c) adhering the first panel and the second panel with an adhesive layer to face the transparent conductive film.

In the forming of the first panel, the transparent coating layer may be laminated before the first transparent conductive film is laminated on the window sheet.

The transparent conductive film may be deposited by a sputtering process or a coating process.

On the other hand, the touch panel according to the present invention configured as described above can be applied to flat panel display devices such as LCD, PDP, EL and the like, and an image display device such as a CRT.

Since the touch panel according to the present invention uses the adhesive layer and the resin film to a minimum, the number of work can be greatly reduced, thereby reducing manufacturing costs and improving productivity.

In addition, by minimizing the use of the adhesive layer and the resin film, it is possible to prevent a process defect, that is, a problem of generation of voids in the adhesive part and a foreign matter mixing problem, and to reduce process defects such as appearance defects or misalignment of the adhesive part due to thickness variation. Yield improvement can be aimed at.

In addition, the touch panel according to the present invention can improve the sensitivity and transmittance by being composed of a small number of members as well as a thin overall thickness due to the minimization of the use of the adhesive layer and the resin film.

In conclusion, according to the present invention, a highly reliable touch panel can be manufactured at low cost.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, embodiments of the present invention illustrated below may be modified in various other forms, and the scope of the present invention is not limited to the embodiments illustrated below. The embodiments of the present invention described below are only provided to more completely explain the present invention to those skilled in the art.

2 is an exploded view schematically showing the structure of a touch panel according to an embodiment of the present invention. As shown in FIG. 2, in the touch panel according to the exemplary embodiment, the first panel 10, the second panel 20, and the first panel 10 and the second panel 20 are adhered to each other. The adhesive layer 30 is provided.

The first panel 10 includes a window sheet 11 and a first transparent conductive layer 12. Although not shown in detail, the window sheet 11 may be formed of a glass or resin film and a printing layer formed on the film. The resin may be PI, PEP, PEN and the like. In addition, the print layer may be printed with a company logo or ad text. The first transparent conductive film 12 is formed by being coated on the window sheet 11 or laminated to a predetermined thickness by sputter deposition.

The second panel 20 includes a base panel 21 and a second transparent conductive film 22. The base panel 21 may be made of tempered glass, PMMA or PC. The second transparent conductive film 22 is formed by laminating a predetermined thickness on the base panel 21 by the same material and method as the first transparent conductive film 12 described above.

The adhesive layer 30 bonds the first panel 10 and the second panel 20 configured as described above so that the transparent conductive films 12 and 22 face each other, and an optically clear adhesive may be preferably used. . Alternatively, the double-sided adhesive tape may be used as the adhesive layer 30.

In the present invention, such an adhesive layer 30 is used in only one portion for adhering the first panel 10 and the second panel 20 to each other. Therefore, in the past, the number of steps is increased by performing the bonding step three times by using the adhesive layer in three places, but in the present invention, the number of steps can be reduced because only one bonding step is performed.

In this case, the transparent conductive films 12 and 22 are preferably indium tin oxide (ITO), but are not limited thereto. Indium zinc oxide (IZO), AZO (Al-doped ZnO), and carbon may be used. Nanotubes (CNT), conductive polymers (PEDOT: poly (3,4-ethylenedioxythiophene)), silver (Ag) or copper (Cu) transparent inks and the like may be used.

That is, indium-zinc-oxide (IZO), AZO (Al-doped ZnO), carbon nanotube (CNT), conductive polymer (PEDOT: poly (3,4-ethylenedioxythiophene)), silver (Ag) or copper as described above. One of the (Cu) transparent inks is deposited on the window sheet 11 and the base panel 21 by coating or sputtering to form the first panel 10 and the second transparent conductive material including the first transparent conductive film 12. The second panel 20 including the film 22 is constituted.

Preferably, the transparent conductive film may be formed by patterning the conductive film in a predetermined pattern form to form the electrostatic electrode and the electrostatic insulator.

Therefore, a touch panel can be comprised using only one adhesive layer at the same time, without using the resin film for forming a transparent conductive film conventionally.

3 illustrates a touch panel according to another embodiment of the present invention. The configuration of this embodiment is the same as that of FIG. 2 except for the first panel 10. The difference is that the transparent coating layer 13 is laminated between the window sheet 11 and the first transparent conductive film 12 of the first panel 10. That is, the transparent coating layer 13 is first laminated on the window sheet 11, and then the first transparent conductive film 12 is laminated.

The transparent coating layer 13 is deposited on the window sheet 11 by coating. The transparent coating layer 13 may be a resin-based material such as BCB or polyimide. The printed layer of the window sheet 11 may cause a slight height difference, and the surface may be planarized by depositing the transparent coating layer 13. Therefore, the first transparent conductive film 12 can be deposited on a flatter surface.

On the other hand, the transparent conductive film can be composed of several layers. To this end, the transparent insulating film and the transparent conductive film may be sequentially laminated on both or either of the first transparent conductive film and the second transparent conductive film. One or more additional conductive layers, ie, such conductive layers composed of a transparent insulating film and a transparent conductive film, can be laminated. This configuration can realize a multi-touch panel structure having a plurality of transparent conductive films.

4 is a flowchart illustrating a method of manufacturing a touch panel according to an embodiment of the present invention. Referring to this, the method for manufacturing a touch panel according to an embodiment of the present invention includes a first panel forming process S110, a second panel forming process S120, and a first and second panel bonding process S130. .

In the step S110, after forming a print layer on a glass or resin film to form a window sheet 11, the window sheet 11 is coated or sputtered with a conductive film forming material to form a first transparent conductive film 12. ) Is a process of forming the first panel 10 having integrally.

Meanwhile, in the process of FIG. 3, the transparent coating layer 13 may be laminated before the first transparent conductive film is laminated on the window sheet. That is, the transparent coating layer 13 may be laminated on the window sheet 11 first, and then the first transparent conductive film 12 may be laminated.

The step S120 is a process of forming the second panel 20 integrally provided with the second transparent conductive film 22 by coating or sputtering the conductive film forming material described above on the base panel 21.

In order to comprise the said transparent conductive film in several layers, a transparent insulating film and a transparent conductive film can be further laminated one by one or both in a 1st transparent conductive film and a 2nd transparent conductive film. By laminating one or more such conductive layers composed of a transparent insulating film and a transparent conductive film, a multi-touch panel structure having a plurality of transparent conductive films can be realized.

After forming the first panel 10 and the second panel 20 which are the main components of the present invention through the above steps, the first panel 10 and the second panel 20 are transparent as in step S130. The conductive panels 12 and 22 are disposed to face each other, and are bonded to each other via the adhesive layer 30 therebetween to manufacture the touch panel according to the embodiment of the present invention.

According to the manufacturing method as described above, the bonding process is minimized to one process of bonding the first panel 10 and the second panel 20, and each transparent conductive film (12, 22) does not use a resin film Since the window sheet 11 and the base film 21 are formed without being deposited, a separate transparent conductive film forming process can be excluded. In other words, it is possible to significantly reduce the labor compared to the conventional.

On the other hand, the touch panel according to an embodiment of the present invention manufactured by the structure and method as described above is an electronic organizer, a liquid crystal display panel (Plasma Display Panel), an organic electroluminescent display It can be applied to a flat panel display device such as an organic electroluminescence display pannel or a CRT.

As mentioned above, although preferred embodiments of the touch panel and the manufacturing method according to the present invention have been described, the present invention is not limited thereto, and various modifications are made within the scope of the claims and the detailed description of the invention and the accompanying drawings. It is possible and this also belongs to the present invention.

1 is an exploded view showing the structure of a typical capacitive touch panel,

2 is an exploded view showing the structure of a touch panel according to an embodiment of the present invention;

3 is an exploded view showing the structure of a touch panel according to another embodiment of the present invention, and

4 is a flowchart illustrating a method of manufacturing a touch panel according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10; first panel 11; window sheet

12; first transparent conductive film 13; Transparent insulating film

20; second panel 21; base panel

22; second transparent conductive film 30; adhesive layer

Claims (20)

A first panel having a window sheet and a first transparent conductive film laminated on the window sheet; A second panel having a base panel and a second transparent conductive film laminated on the base panel; And And an adhesive layer for bonding the first panel and the second panel to face the transparent conductive film. The method of claim 1, A capacitive touch panel, wherein a transparent coating layer is laminated between the window sheet and the first transparent conductive film. The method according to claim 1 or 2, A capacitive touch panel, wherein at least one conductive layer in which a transparent insulating film and a transparent conductive film are sequentially stacked is laminated on all or one of the first transparent conductive film and the second transparent conductive film. The method according to claim 1 or 2, The window sheet further comprises a film and a printed layer formed on the film. The method of claim 4, wherein The film is a capacitive touch panel, characterized in that the resin film or glass film. The method according to claim 1 or 2, The transparent conductive film is ITO capacitive touch panel, characterized in that. The method according to claim 1 or 2, The adhesive layer is a capacitive touch panel, characterized in that the optical transparent adhesive (OCA) or a transparent double-sided adhesive tape. The method according to claim 1 or 2, The base panel is a capacitive touch panel, characterized in that consisting of any one of tempered glass, PMMA and PC. The method of claim 2, The transparent coating layer is capacitive touch panel, characterized in that one selected from BCB or polyimide. The method of claim 3, The transparent insulating film is a capacitive touch panel, characterized in that one selected from OXIDE, BCB, or polyimide. (a) forming a first panel by laminating a first transparent conductive film on a window sheet having a glass or resin film and a printing layer formed on the film; (b) forming a second panel by laminating a second transparent conductive film on the base panel; And (c) adhering the first panel and the second panel with an adhesive layer so that the transparent conductive film faces each other. The method of claim 11, In the step (a), before the first transparent conductive film is laminated on the window sheet, a method of manufacturing a capacitive touch panel, characterized in that for laminating. 13. The method according to claim 11 or 12, Before the step (c), further comprising the step of laminating one or more conductive layers in which a transparent insulating film and a transparent conductive film are sequentially stacked on the first transparent conductive film or the second transparent conductive film. Capacitive touch panel manufacturing method. 13. The method according to claim 11 or 12, The transparent conductive film is a capacitive touch panel manufacturing method, characterized in that for depositing each by a sputtering process. 13. The method according to claim 11 or 12, The transparent conductive film is a capacitive touch panel manufacturing method, characterized in that each deposited by a coating process. 13. The method according to claim 11 or 12, The transparent conductive film is ITO, characterized in that the capacitive touch panel manufacturing method. 13. The method according to claim 11 or 12, The adhesive layer is an optical transparent adhesive (OCA) or a transparent double-sided adhesive tape, characterized in that the capacitive touch panel manufacturing method. 13. The method according to claim 11 or 12, The base panel is a capacitive touch panel manufacturing method, characterized in that any one of tempered glass, PMMA and PC. The method of claim 12, The transparent coating layer is capacitive touch panel, characterized in that one selected from BCB or polyimide. The method of claim 13, The transparent insulating film is a capacitive touch panel manufacturing method, characterized in that one selected from OXIDE, BCB, or polyimide.

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