Abstract:
Disclosed herein is a structure of an FPC integrated touch panel. According to preferred embodiments of the present invention, a transparent substrate configured of a flexible transparent film is provided and an extension part protruded to the transparent substrate is integrally formed with the transparent substrate, such that a separate FPC needs not to be manufactured, thereby saving process time and manufacturing costs. In addition, the exemplary embodiments of the present invention bend an inactive area unnecessarily occupying an area of the transparent substrate to a side of the touch panel, thereby implementing a touch panel widening a substantial area of an active region.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2011-0090812, filed on Sep. 7, 2011, entitled “Touch Panel,” which is hereby incorporated by reference in its entirety into this application. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Technical Field 
         [0003]    The present invention relates to a touch panel. 
         [0004]    2. Description of the Related Art 
         [0005]    As a computer using a digital technology is developed, accessory devices of the computer have also been developed. A personal computer, a portable transmission device, and other personal only information processing devices, or the like, perform text and graphic processing using various input devices such as a keyboard, a mouse, or the like. 
         [0006]    However, as an information-oriented society is rapidly progressed, a usage of the computer has gradually expanded. It is difficult to efficiently drive products only by the keyboard and the mouse serving as the present input devices. Therefore, a need for devices that are simple and have little malfunction while allowing anyone to easily input information is increased. 
         [0007]    In addition, a technology for an input device has been evolved to a technology of high reliability, durability, innovation, design and machining, or the like, including a technology of satisfying general functions. In order to achieve the above objects, a touch panel as an input device capable of inputting information such as text, graphic, or the like, has been developed. 
         [0008]    The touch panel is installed on a display surface of a flat panel display, such as an electronic notebook, a liquid crystal display device (LCD), a plasma display panel (PDP), electroluminescence (El), or the like, and an image display device, such as a cathode ray tube (CRT), which is a tool used for a user to select desired information while watching an image display device. 
         [0009]      FIG. 1  shows a cross-sectional view of a touch panel according to the prior art and  FIG. 2  shows a perspective view of a touch panel shown in  FIG. 1 . Referring to  FIGS. 1 and 2 , a touch panel  100  according to the prior art includes transparent substrates  110  and  120 , transparent electrodes  115  and  125 , and electrode wirings  117  and  127  and further includes an FPC  130 . That is, the first transparent electrodes  115  and the second transparent electrodes  125  are formed on surfaces of each of the first transparent substrate  110  and the second transparent substrate  120  that faces each other are provided with and the first electrode wirings  117  electrically connected to the first transparent electrodes  115  are formed at edges of the first transparent electrodes  115  and the second electrode wirings  127  electrically connected to the second transparent electrodes  125  are formed at edges of the second transparent electrodes  125 . The first electrode wirings  117  and the second electrode wirings  127  are concentrated on side ends of the transparent substrates  110  and  120  and the separately disposed FPC  130  is connected to the first electrode wirings  117  and the second electrode wirings  127  and transmits electrical signals to a controller (not shown). 
         [0010]    The transparent substrates  110  and  120  configuring the touch panel  100  according to the prior art are partitioned into an active region in which the transparent electrodes  115  and  125  are formed and an inactive region in which the electrode wirings  117  and  127  are formed. The transparent electrodes  115  and  125  are configured to serve to sense a touch input position of a user. In order to more accurately sense the touch position, there is a need to densely dispose the transparent electrodes  115  and  125  that are formed in a predetermined area of the active region. Therefore, the number of electrode wirings  117  and  127  electrically connected to the transparent electrodes  115  and  125  is also increased, such that an area occupied by the inactive region may unnecessarily extend in the transparent substrates  110  and  120 . 
         [0011]    Meanwhile, a demand for a transparent conductive layer material has also increased with a sudden expansion of a thin display field business, centering around an LCD. As the transparent conductive layer material, indium tin oxide (ITO) has been mainly used. When considering the rising demand for applications due to excellent characteristics of the ITO as a transparent electrode, it is expected that the consumption of the material is gradually increased in the future. However, indium forming ITO is a representative one of scarce and depleting resources and the supply thereof is greatly reduced. According to the specialist, it is expected that the indium is fully exhausted from about 10 to about 25 years. The indium needs to be purified using by-products of a zinc ore, which also leads to high scarcity. Even before the indium is depleted, the sudden rise in indium price leads to increase manufacturing costs of applications. Therefore, a development of a new transparent conductive layer that does not include the indium is very urgently needed. 
       SUMMARY OF THE INVENTION 
       [0012]    The present invention has been made in an effort to provide a touch panel including a transparent substrate to which a flexible transparent film is applied to increase a substantial area of an active region by bending an inactive region unnecessarily occupying an area of the transparent substrate to a side of the touch panel. In addition, the present invention has been made in an effort to provide a touch panel capable of removing a depletion problem of resources used for a transparent conductive film by replacing ITO used for a transparent electrode so as to form a metal electrode configured of a metal film. 
         [0013]    According to a first preferred embodiment of the present invention, there is provided a touch panel, including: a first transparent substrate; a first extension part extending to be protruded from one side of the first transparent substrate so as to be integrally formed with the first transparent substrate; a first metal electrode formed on one surface of the first transparent substrate; a first electrode wiring extending from the first metal electrode so as to be formed on the first transparent substrate and the first extension part; a second transparent substrate facing the first transparent substrate; a second extension part extending to be protruded from one side of the second transparent substrate so as to be integrally formed with the second transparent substrate; a second metal electrode formed on one surface of the second transparent substrate; and a second electrode wiring extending from the second metal electrode so as to be formed on the second transparent substrate and the second extension part, wherein the first transparent substrate is divided into an active region and an inactive region and is bent at a boundary line between the active region and the inactive region of the first transparent substrate so that the inactive region of the first transparent substrate and the first extension part are vertically disposed to the active region of the first transparent substrate, and the second transparent substrate is divided into an active region and an inactive region and is bent at a boundary line between the active region and the inactive region of the second transparent substrate so that the inactive region of the second transparent substrate and the first extension part are vertically disposed to the active region of the second transparent substrate. 
         [0014]    The touch panel may further include a controller, wherein the controller may be connected to the first electrode wiring formed on the first extension part and the second electrode wiring formed on the second extension part. 
         [0015]    The first transparent substrate and the first extension part and the second transparent substrate and the second extension part may be configured of a flexible transparent film. 
         [0016]    The first metal electrode may be formed in the active region of the first transparent substrate so that straight electrode lines are repeatedly disposed in parallel in one direction and the second metal electrode may be formed in the active region of the second transparent substrate so that straight electrode lines formed in a direction vertical to the first metal electrode are repeatedly disposed in parallel. 
         [0017]    The touch panel may further include an adhesive layer bonding the other surface of the first transparent substrate to one surface of the second transparent substrate. 
         [0018]    A protruding direction of the first extension part may be orthogonal to a protrusion direction of the second extension part. 
         [0019]    The first metal electrode or the second metal electrode may be a metal mesh electrode. 
         [0020]    According to a second preferred embodiment of the present invention, there is provided a touch panel, including: a transparent substrate; a first extension part extending to be protruded from one side of the transparent substrate so as to be integrally formed with the transparent substrate; a first metal electrode formed on one surface of the first transparent substrate; a first electrode wiring extending from the first metal electrode so as to be formed on one surface of the transparent substrate and the first extension part; a second extension part extending to be protruded from the other side of the transparent substrate so as to be integrally formed with the transparent substrate; a second metal electrode formed on the other surface of the transparent substrate; and a second electrode wiring extending from the second metal electrode so as to be formed on the other surface of the transparent substrate and the second extension part. 
         [0021]    The one surface of the first transparent substrate may be divided into a first active region and a first inactive region and may be bent at a boundary line between the first active region and the first inactive region so that the first inactive region and the first extension part are vertically disposed to the first active region of the transparent substrate and the other surface of the transparent substrate may be divided into a second active region and a second inactive region, the second active region corresponding to the first active region, and may be bent at a boundary line between the second active region and the second inactive region so that the second inactive region and the second extension part are vertically disposed to the second active region of the transparent substrate. 
         [0022]    The touch panel may further include a controller, wherein the controller may be connected to the first electrode wiring formed on the first extension part and the second electrode wiring formed on the second extension part. 
         [0023]    The transparent substrate, the first extension part, and the second extension part may be configured of a flexible transparent film. 
         [0024]    The transparent substrate, the first extension part, and the second extension part may be configured of a flexible transparent film. 
         [0025]    The first metal electrode may be formed in the first active region of the transparent substrate so that straight electrode lines are repeatedly disposed in parallel in one direction and the second metal electrode may be formed in the second active region of the transparent substrate so that straight electrode lines formed in a direction vertical to the metal electrode are repeatedly disposed in parallel. 
         [0026]    The first metal electrode or the second metal electrode may be a metal mesh electrode. 
         [0027]    According to a third preferred embodiment of the present invention, there is provided a touch panel, including: a transparent substrate; an extension part extending to be protruded from one side of the transparent substrate so as to be integrally formed with the transparent substrate; metal electrode formed on one surface of the transparent substrate; and an electrode wiring extending from the metal electrode so as to be formed on the first transparent substrate and the extension part, wherein the transparent substrate is divided into an active region and an inactive region and is bent at a boundary line between the active region and the inactive region of the transparent substrate so that the inactive region of the transparent substrate and the extension part are vertically disposed to the active region of the transparent substrate. 
         [0028]    The transparent substrate may be configured of a flexible transparent film. 
         [0029]    The metal electrode may be a metal mesh electrode. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0030]      FIG. 1  is a cross-sectional view of a touch panel according to the prior art; 
           [0031]      FIG. 2  is a perspective view of the touch panel of  FIG. 1 ; 
           [0032]      FIG. 3A  is a cross-sectional view of the touch panel according to a first preferred embodiment of the present invention; 
           [0033]      FIG. 3B  is a perspective view of the touch panel according to the  FIG. 3A ; 
           [0034]      FIG. 4A  is a cross-sectional view of the touch panel according to another first preferred embodiment of the present invention; 
           [0035]      FIG. 4B  is a perspective view of the touch panel according to the  FIG. 4A ; 
           [0036]      FIG. 5A  is a plan view and a perspective view of a transparent substrate configuring the touch panel of  FIGS. 3A and 3B ; 
           [0037]      FIG. 5B  is a plan view and a perspective view of another transparent substrate configuring the touch panel of  FIGS. 3A and 3B ; 
           [0038]      FIG. 6A  is a cross-sectional view of a touch panel according to a second preferred embodiment of the present invention; 
           [0039]      FIG. 6B  is a perspective view of the touch panel according to the  FIG. 6A ; 
           [0040]      FIG. 7A  is a cross-sectional view of a touch panel according to another second preferred embodiment of the present invention; 
           [0041]      FIG. 7B  is a perspective view of the touch panel according to the  FIG. 7A ; 
           [0042]      FIG. 8A  is a plan view and a perspective view of a transparent substrate configuring the touch panel of  FIGS. 6A and 6B ; 
           [0043]      FIG. 8B  is a plan view and a perspective view of another transparent substrate configuring the touch panel of  FIGS. 6A and 6B . 
           [0044]      FIGS. 9A and 9B  are a cross-sectional view and a perspective view of a touch panel according to a third preferred embodiment of the present invention; 
           [0045]      FIGS. 10A and 10B  are a cross-sectional view and a perspective view of a touch panel according to another third preferred embodiment of the present invention; and 
           [0046]      FIG. 11  is a plan view and a perspective view of a transparent substrate of a touch panel according to the third preferred embodiment of the present invention. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0047]    Various objects, advantages and features of the invention will become apparent from the following description of embodiments with reference to the accompanying drawings. 
         [0048]    The terms and words used in the present specification and claims should not be interpreted as being limited to typical meanings or dictionary definitions, but should be interpreted as having meanings and concepts relevant to the technical scope of the present invention based on the rule according to which an inventor can appropriately define the concept of the term to describe most appropriately the best method he or she knows for carrying out the invention. 
         [0049]    Various objects, advantages and features of the invention will become apparent from the following description of embodiments with reference to the accompanying drawings. In the specification, in adding reference numerals to components throughout the drawings, it is to be noted that like reference numerals designate like components even though components are shown in different drawings. Further, when it is determined that the detailed description of the known art related to the present invention may obscure the gist of the present invention, the detailed description thereof will be omitted. 
         [0050]    Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
       First Preferred Embodiment 
       [0051]      FIGS. 3A and 3B  show a touch panel  200  according to a first preferred embodiment of the present invention and  FIGS. 4A and 4B  show a touch panel  200  according to another first preferred embodiment of the present invention. The touch panel  200  according to the first preferred embodiment of the present invention is configured to include a first transparent substrate  210  and a second transparent substrate  220  formed to face the first transparent substrate  210 , a first extension part  215  extending from the first transparent substrate  210  so as to be integrally formed with the first transparent substrate  210 , a second extension part  225  extending from the second transparent substrate  220  so as to be integrally formed with the second transparent substrate  220 , and metal electrodes (first metal electrodes  217  and second metal electrodes  227 ) formed on the transparent substrates (the first transparent substrate  210  and the second transparent substrate  220 ) and electrode wirings (first electrode wirings  219  and second electrode wirings  229 ). 
         [0052]    Referring to  FIGS. 5A and 5B , the transparent substrates  210  and  220  serve to provide a region in which the metal electrodes  217  and  227  and the electrode wirings  219  and  229  are formed (see  FIG. 5 ). The first transparent substrate  210  is divided into an active region A and an inactive region B, wherein the active region A is a part in which the first metal electrodes  217  are formed so as to recognize a touch of the input unit and occupies most of the first transparent substrate  210  and the inactive region B is a part in which the first electrode wirings  219  extending from the first metal electrodes  217  are formed and is formed on one side of the first transparent substrate  210 . The second transparent substrate  220  is divided into an active region A and an inactive region B, wherein the active region A is a part in which the second metal electrodes  227  are formed so as to recognize a touch of the input unit and occupies most of the second transparent substrate  220  and the inactive region B is a part in which the second electrode wirings  229  extending from the second metal electrodes  227  are formed and is formed on one side of the second transparent substrate  220 . The first metal electrodes  217  and the first electrode wirings  219  are formed on one surface of the first transparent substrate  210  and the second metal electrodes  227  and the second electrode wirings  229  are formed on one surface of the second transparent substrate  220 , the touch panel  200  is configured so that the other surface of the first transparent substrate  210  faces one surface of the second transparent substrate  220 . In this configuration, an adhesive layer  230  (see  FIGS. 3A and 3B ) bonding both transparent substrates  210  and  220  to each other may be further formed between the other surface of the first transparent substrate  210  and one surface of the second transparent substrate  220 . 
         [0053]    Meanwhile, the transparent substrates  210  and  220  configuring the touch panel  200  according to the preferred embodiment of the present invention include the protruded extension parts  215  and  225  and the transparent substrates  210  and  220  are configured of a flexible transparent film. 
         [0054]    First, the transparent substrates  210  and  220  include the extension parts  215  and  225  that are protruded from the inactive region B so as to be integrally formed with the transparent substrates  210  and  220 . That is, the first transparent substrate  210  includes the first extension part  215  that is protruded from the inactive region B so as to be integrally formed with the first transparent substrate  210  and the second transparent substrate  220  includes the second extension part  225  that is protruded from the inactive region B so as to be integrally formed with the second transparent substrate  220 . The first extension part  215  and the second extension part  225  are configured to correspond to an FPC  130  (see  FIGS. 1 and 2 ) connecting the touch panel to the controller, in the touch panel (see  FIGS. 1 and 2 ) according to the prior art. The transparent substrates  210  and  220  are manufactured using the flexible transparent film as a fundamental material and provides the FPC integrated touch panel  200  by integrally forming the extension parts  215  and  225  corresponding to the FPC according to the prior art with the transparent substrates  210  and  220 . As described below, in the touch panel  200 , the first metal electrodes  217  formed on the first transparent substrate  210  are orthogonal to the second metal electrodes  227  formed on the second transparent substrate  220 , such that a direction in which the first extension part  215  is protruded from the first transparent substrate  210  and a direction in which the second extension  225  is protruded from the second transparent substrate  220  forms 90° with respect to each other (see  FIGS. 3A and 3B ). 
         [0055]    Next, the transparent substrates  210  and  220  are configured of a flexible transparent film. The flexible transparent film has a function of an insulating material and has excellent flexibility. Therefore, a predetermined degree of freedom is provided to the inactive region B and the extension parts  215  and  225 . As the materials for the flexible transparent film, polyimide is preferable. However, the exemplary embodiment of the present invention may use any material without being limited if the materials for the flexible transparent film are the insulating materials having excellent flexibility. 
         [0056]    The transparent substrates  210  and  220  may be modified into various three-dimensional shapes due to the above-mentioned two characteristics. Representatively, as shown in  FIGS. 3A and 3B , transparent substrates  210  and  220  are bent at a boundary line between the active region A and the inactive region B of the transparent substrates  210  and  220  so that the inactive region B may be vertical to the active region A or as shown in  FIGS. 4A and 4B , the transparent substrates  210  and  220  are bent the boundary line between the active region A and the inactive region B of the transparent substrates  210  and  220  so that the inactive region B and the extension parts  215  and  225  may be smoothly curved. With reference to both of the modification examples, in a top of the touch panel  200 , only the active region A of the first transparent substrate  210  is occupies user vision, while the inactive region B unnecessarily occupying the area of the transparent substrate due to the electrode wirings  219  and  229  formed in the inactive region B encloses a side portion of the touch panel  200 . That is, it is possible to use the wider active region A. 
         [0057]    The metal electrodes  217  and  227  serve to allow an input unit to generate signals at the time of touch so as for the controller to recognize touched coordinates and are formed on one surface of the transparent substrates  210  and  220 . In the exemplary embodiment of the present invention, the metal electrode formed on one surface of the first transparent substrate  210  is named as the first metal electrode  217  and the metal electrode formed on one surface of the second transparent substrate  220  is named as the second metal electrode  227 . The metal electrodes may be formed by generally forming a thin film on the transparent substrate using a dry process, such as sputtering, evaporation, or the like, or a wet process such as dip coating, spin coating, roll coating, spray coating, or the like, and then, selectively etching the thin film or by using a direct patterning process, such as a screen printing method, a gravure printing method, an inkjet printing method, or the like. 
         [0058]    Meanwhile, edges of the first metal electrodes  217  and the second metal electrodes  227  are provided with the first electrode wirings  219  receiving electrical signals from the first metal electrodes  217  and the second electrode wirings  229  receiving electrical signals from the second metal electrodes  227 . In this configuration, the electrode wirings  219  and  229  may be printed using the screen printing method, the gravure printing method, the inkjet printing method, or the like. In addition, as the materials for the electrode wirings  219  and  229 , silver paste (Ag paste) having excellent electric conductivity or materials composed of organic silver may be used. However, the exemplary embodiment of the present invention is not limited thereto and therefore, a conductive polymer or low-resistance metal of metal oxides or metals such as carbon black (including CNT), or the like, may be used. Meanwhile, when the electrode wirings  219  and  229  are made of the same metal as the metal electrodes  217  and  227 , the metal electrodes  217  and  227  and the electrode wirings  219  and  229  may be simultaneously formed on the transparent substrates  210  and  220 . 
         [0059]    Meanwhile, as shown in  FIG. 5 , the first metal electrodes  217  are formed in the active region A of the first transparent substrate  210  and individual metal electrode lines configuring the first metal electrodes  217  may be formed so as to face the first extension part  215 . In other words, the first metal electrode  217  is configured so that the metal electrode lines disposed so as to be parallel with an x axis are disposed so as to be parallel with a y-axis direction. Meanwhile, the first electrode wirings  219  electrically connected to the first metal electrodes  217  are formed in the inactive region B and are concentrated at the boundary between the inactive region B and the first extension part  215  so as to extend to the first extension part  215 . The first transparent substrate  210  is configured of the flexible transparent film and thus, may be easily bent and may be flexible. In the exemplary embodiment of the present invention, the first transparent substrate  210  is bent at the boundary line between the active region A and the inactive region B of the first transparent substrate  210 . The first electrode wiring  219  formed in the inactive region B encloses the side portion of the touch panel  200  and the first extension part  215  extending to be protruded from the inactive region B faces the controller  290  (see  FIGS. 3A and 3B ) provided on the touch panel  200  and is connected to a printed circuit board (not shown) formed in the controller  290 . 
         [0060]    Similarly, the second metal electrodes  227  are formed in the active region A of the second transparent substrate  220  and individual metal electrode lines configuring the second metal electrodes  227  may be formed so as to face the second extension part  225 . In other words, the second metal electrode  227  is configured so that the metal electrode lines disposed so as to be parallel with a y axis are disposed so as to be parallel with an x-axis direction. Meanwhile, the second electrode wirings  229  electrically connected to the second metal electrodes  227  are formed in the inactive region B and are concentrated at the boundary between the inactive region B and the second extension part  225  so as to extend to the second extension part  225 . The second transparent substrate  210  is configured of the flexible transparent film and thus, may be easily bent and may be flexible. In the exemplary embodiment of the present invention, the second transparent substrate  220  is bent at the boundary line between the active region A and the inactive region B of the second transparent substrate  220 . The second electrode wirings  229  formed in the inactive region B encloses the side portion of the touch panel  200  and the second extension part  225  extending to be protruded from the inactive region B faces the controller  290  (see  FIGS. 3A and 3B ) provided on the touch panel  200  and is connected to the printed circuit board (not shown) formed in the controller  290 . 
         [0061]    In the exemplary embodiment of the present invention, since the directions of forming the first metal electrode  217  and the second metal electrode  227  are vertical to each other and the first metal electrode  217  and the second metal electrode  227  each face the first extension part  215  and the second extension part  225 , the protruding direction of the first extension part  215  extending from the first transparent substrate  210  and the protruding direction of the second extension part  225  extending from the second transparent substrate  220  also form 90° with respect to each other. 
         [0062]    An image display device  270  (see  FIGS. 3A and 3B ) is attached to the other surface of the second transparent substrate  220  and the second transparent substrate  220  may be bonded to the image display device  270  by using an adhesive member (not shown). The image display device  270  serves to output images and includes a liquid crystal display device (LCD), a plasma display panel (PDP), an electroluminescence (EL), a cathode ray tube (CRT), or the like. In addition, as the adhesive member (not shown), a transparent material so as not to hinder the user from recognizing the images output from the image display device  270  may be used. For example, an optical clear adhesive (OCA) may be used. 
       Second Preferred Embodiment 
       [0063]      FIGS. 6A and 6B  show a touch panel according to a second preferred embodiment of the present invention and  FIGS. 7A and 7B  show a touch panel according to another second preferred embodiment of the present invention. Unlike the first preferred embodiment of the present invention, in the second preferred embodiment of the present invention, a single transparent substrate  310  is provided and metal electrodes  317  and  327  are formed on both surfaces of the transparent substrate  310 . That is, a touch panel  300  according to the second exemplary embodiment of the present invention is configured to include a transparent substrate  310 , a first extension part  315  and a second extension part  325  extending from the transparent substrate  310  so as to be integrally formed with the transparent substrate  310 , first metal electrodes  317  and second metal electrodes  327  formed on both surfaces of the transparent substrate  310 , and first electrode wirings  310  and second electrode wirings  329  connected to the metal electrodes  317  and  327 . 
         [0064]    Referring to  FIGS. 8A and 8B , the transparent substrates  310  serve to provide a region in which the metal electrodes  317  and  327  and the electrode wirings  319  and  329  are formed. One surface of the transparent substrate  310  is divided into a first active regions A and a first inactive region B1 and the other surface thereof is divided into a second active region A2 and a second inactive region B2. The first active region A1 and the second active region A2 are formed at a position corresponding to each other and the first inactive region B1 and the second inactive region B2 are disposed to intersect with each other by 90°. For example, when the first inactive region B1 is disposed at any one of the left and right (an x axis on  FIGS. 8A  an  8 B) of the first active region A1, the second inactive region B2 is disposed at any one of the top and bottom (a y axis on  FIGS. 8A and 8B ) of the second active region A2. 
         [0065]    Meanwhile, similarly to the first preferred embodiment, the transparent substrate  310  configuring the touch panel  300  of the exemplary embodiment of the present invention includes a pair of protruded extension parts (the first extension part  315  and the second extension part  325 ) and the transparent substrate  310  is configured of the flexible transparent film. 
         [0066]    First, the transparent substrate  310  includes the first extension part  315  protruded from the first inactive region B1 of one surface thereof so as to be integrally formed with the transparent substrate  310  and the second extension part  325  protruded from the second inactive region B2 the other surface thereof so as to be integrally formed with the transparent substrate  310 . As described above, since the first inactive region B1 and the second inactive region B2 are disposed to intersect with each other by 90° based on the first active region A1 and the second active region A2 corresponding to each other, the extension parts  315  and  325  protruded to extend from these inactive regions B1 and B2 also form 90° on an x-y plane based on the active regions A1 and A2. 
         [0067]    Next, the transparent substrate  310  is configured of the flexible transparent film. The detailed description thereof is the same as the corresponding portions of the first preferred embodiment and therefore, the repeated description thereof will be omitted. 
         [0068]    The transparent substrate  310  may be modified into various three-dimensional shapes due to the above-mentioned two characteristics. Representatively, as shown in  FIGS. 6A and 6B , the transparent substrate  310  is bent at the boundary line between the first active region A1 and the first inactive region B1 of the transparent substrate  310  so that the first inactive region B1 may be vertical to the first active region A1 and the transparent substrate  310  is bent at the boundary line between the second active region A2 and the second inactive region B2 of the transparent substrate  310  so that the second inactive region B2 and the second active region A2 may be vertically bent to each other. In addition, as shown in  FIGS. 7A and 7B , the transparent substrate  310  is bent at the boundary line between the first active region A1 and the first inactive region B1 of the transparent substrate  310  so that the first inactive region B1 and the first extension part  315  may be smoothly curved and the transparent substrate  310  is bent from boundary line between the second active region A2 and the second inactive region B2 of the transparent substrate  310  so that the second inactive region B2 and the second extension part  325  may be smoothly curved. In both of the modified examples, in a top of the touch panel  300 , only the first active region A1 (or the second active region A2) of the transparent substrate  310  occupies the user&#39;s vision, while the inactive region (the first inactive region B1 and the second inactive region B2) unnecessary occupying an area of the transparent substrate  310  due to the electrode wirings  319  and  329  formed in the inactive region encloses the side portion of the touch panel  300 . That is, it is possible to use the wider active regions A1 and A2. 
         [0069]    The metal electrodes  317  and  327  serve to allow the input unit to generate signals at the time of touch so as for the controller to recognize touched coordinates and are formed on both surfaces of the transparent substrates  310 . In the exemplary embodiment of the present invention, the first metal electrode formed on one surface of the transparent substrate  310  is named as the first metal electrode  317  and the metal electrode formed on the other surface of the transparent substrate  310  is named as the second metal electrode  327 . A method for forming the metal electrodes  317  and  327  is the same as the corresponding portion of the above-mentioned first preferred embodiment. 
         [0070]    Edges of the first metal electrode  317  and the second metal electrode  327  are provided with the first electrode wiring  319  receiving electrical signals from the first metal electrode  317  and the second electrode wiring  329  receiving electrical signals from the second metal electrode  327 . In this configuration, the electrode wirings  319  and  329  may be printed using the screen printing method, the gravure printing method, the inkjet printing method, or the like. In addition, as the materials for the electrode wirings  319  and  329 , silver paste (Ag paste) having excellent electric conductivity or materials composed of organic silver may be used. However, the exemplary embodiment of the present invention is not limited thereto and therefore, a conductive polymer, a metal oxide such as carbon black (including CNT), or a low-resistance metal such as metals, or the like, may be used. Meanwhile, when the electrode wirings  319  and  329  are made of the same metal as the metal electrodes  317  and  327 , the metal electrodes  317  and  327  and the electrode wirings  319  and  329  may be simultaneously formed on the transparent substrate  310 . 
         [0071]    As shown in  FIGS. 8A and 8B , the first metal electrode  317  is formed in the first active region A1 of the transparent substrate  310  and individual metal electrode lines configuring the first metal electrode  317  may be formed to face the first extension part  315 . In other words, the first metal electrode  317  is configured so that the metal electrode lines disposed so as to be parallel with an x axis are disposed so as to be parallel with a y-axis direction. Meanwhile, the first electrode wirings  319  electrically connected to the first metal electrodes  317  are formed in the first inactive region B1 and are concentrated at the boundary between the first inactive region B1 and the first extension part  315  so as to extend to the first extension part  315 . Similarly, the second metal electrodes  327  are formed in the second active region A2 of the transparent substrate  310  and individual metal electrode lines configuring the second metal electrodes  327  may be formed so as to face the second extension part  325 . In other words, the second metal electrode  327  is configured so that the metal electrode lines disposed so as to be parallel with a y axis are disposed so as to be parallel with an x-axis direction. Meanwhile, the second electrode wirings  329  electrically connected to the second metal electrodes  327  are formed in the second inactive region B2 and are concentrated at the boundary between the second inactive region B2 and the second extension part  325  so as to extend to the second extension part  325 . 
         [0072]    The transparent substrate  310  is configured of the flexible transparent film and thus, may be easily bent and may be flexible. In the exemplary embodiment of the present invention, the transparent substrate  310  is bent at the boundary line between the first active region A1 and the first inactive region B1 of the transparent substrate  310 . The first electrode wiring  319  formed in the first inactive region B1 encloses the side portion of the touch panel  300  and the first extension part  315  extending to be protruded from the first inactive region B1 faces the controller  390  (see  FIGS. 6A and 6B ) provided on the touch panel  300  and is connected to a printed circuit board (not shown) formed in the controller  390 . In addition, the transparent substrate  310  is bent at the boundary line between the second active region A2 and the second inactive region B2 of the transparent substrate  310 . The second electrode wiring  329  formed in the second inactive region B2 encloses the side portion of the touch panel  300  and the second extension part  325  extending to be protruded from the second inactive region B2 faces the controller  390  (see  FIGS. 6A and 6B ) provided on the touch panel  300  and is connected to a printed circuit board (not shown) formed in the controller  390 . 
         [0073]    In the exemplary embodiment of the present invention, since the directions of forming the first metal electrode  317  and the second metal electrode  327  are vertical to each other and the first metal electrode  317  and the second metal electrode  327  each face the first extension part  315  and the second extension part  325 , the protruding direction of the first extension part  315  and the protruding direction of the second extension part  325  extending from the transparent substrate  310  also form 90° with respect to each other. 
         [0074]    The image display device  370  is attached to the other surface of the transparent substrate  310  and the transparent substrate  310  may be bonded to the image display device  370  by using the adhesive member (not shown). The detailed description of the image display device  370  and the adhesive member (not shown) are repeated with the first preferred embodiment and therefore, will be omitted. 
       Third Preferred Embodiment 
       [0075]      FIGS. 9A and 9B  are a cross sectional view and a perspective view according to the third preferred embodiment of the present invention and  FIGS. 10A and 10B  are a cross-sectional view and a perspective view according to another third preferred embodiment of the present invention.  FIG. 11  is a plan view and a perspective view of a transparent substrate of a touch panel according to the third preferred embodiment of the present invention. 
         [0076]    The touch panel according to the third preferred embodiment of the present invention includes a transparent substrate  410 , an extension part  415  protruded to extend from one side of the transparent substrate  410  so as to be integrally formed with the transparent substrate  410 , metal electrodes  417  formed on the transparent substrate  410 , and electrode wirings  419  extending from the metal electrode  417  so as to be formed on the transparent substrate  410  and the extension part  415 , wherein the transparent substrate  410  is divided into the active region A and the inactive region B and the inactive region B and the transparent substrate  410  is bent at a boundary line between the active region A and the inactive region B of the transparent substrate  410  so that the inactive region B of the transparent substrate  410  and the extension part  415  may be vertically disposed to the active region A of the transparent substrate  410 . 
         [0077]    Hereinafter, the detailed description of the overlapping components and effects as the first and second preferred embodiments will be omitted. 
         [0078]    Referring to  FIG. 11 , the transparent substrate  410  serve to provide a region in which the metal electrodes  417  and the electrode wirings  419  are formed. The transparent substrate  410  is divided into the active region A and the inactive region B, wherein the active region A is a portion in which the metal electrode  417  is formed so as to recognize the touch of the input unit and occupies most of the transparent substrate  410 . In addition, the inactive region B is a portion in which the electrode wirings  419  extending from the metal electrodes  417  are formed and is disposed on one side of the transparent substrate  410 . 
         [0079]    The transparent substrate  410  configuring the touch panel may be configured of the flexible transparent film as in the preferred embodiment described above. The extension part  415  using the flexible transparent film, formed to be protruded from the inactive region of the transparent substrate  410 , and serving the flexible printed circuit (FPC) for electrical connection with the printed circuit board is integrally formed with the transparent substrate  410 . The transparent substrate  410  may be changed in a design into various shapes due to the structural characteristics. As shown in  FIG. 9B , the active region A and the inactive region of the transparent substrate  410  are vertically bent to each other or as shown in  FIG. 10B , the active region A and the inactive region of the transparent substrate  410  may be smoothly curved at the boundary line therebetween. Due to the modification, the active region A of the touch panel may be more visually noticeably recognized by the user. 
         [0080]    In addition, the electrode wirings  419  are formed at the edges of the metal electrodes  417  and the function and formation method thereof overlaps with the above-mentioned preferred embodiments and therefore, the detailed description thereof will be omitted. 
         [0081]    In addition, it is previously described that the image display device  470  is attached on one surface of the transparent substrate  410 , one side of the image display device  470  is formed with the controller  490 , and the extension part  415  is connected to the printed circuit board formed in the controller  490 . An adhesive layer  430  may be applied to one surface of the transparent substrate  410  to reinforce the adhesion with the image display device  470 . Herein, as the adhesive layer  430 , various transparent adhesives such as an optical composite adhesive (OCA) may be used. 
         [0082]    In particular, despite the name thereof, as the metal electrodes used in the first to third preferred embodiments of the present invention, the transparent electrode or a metal mesh electrode may be used. In addition, it can be appreciated from those skilled in the art that both of the transparent electrode or the metal mesh electrode may be applied to a capacitive type, a resistive type, or the like, through the structural change of the transparent substrate and the metal electrodes and various changes in a design of the electrode type and the structural change may be made. 
         [0083]    Hereinafter, the transparent electrode and the metal mesh electrode will be briefly described. 
         [0084]    As the metal electrode, the transparent electrode or the metal mesh electrode may be used. 
         [0085]    First, the transparent electrode is formed on one surface of the transparent substrate. Herein, the transparent electrode may be made of the conductive polymer, in detail, may be made of poyl-3, 4-ethylene dioxy thiophene/polystyrene sulfonate (PEDOT/PSS), polyaniline, polyacetylene, or polyphenyl vinylene, or the like. In addition, materials such as the indium-tin-oxide (ITO), the carbon nanotube that is the organic transparent electrode material, graphene, zinc oxide (ZnO), tin oxide (SnO2), or the like, may be used. In addition, it is apparent that those skilled in the art can be selected and changed into the transparent electrode made of various materials. The transparent electrode may be formed on the transparent substrate by a physical method such as a sputtering method, a vacuum deposition method, an ion plating method, or the like, or a chemical method such as a spray method, a dip method, a chemical vapor deposition (CVD) method, or the like, but the preferred embodiments of the present invention are not limited thereto. 
         [0086]    The metal mesh electrode may be formed by radiating the radiation solution to a transparent substrate  11   a  by an electrospinning method. In this case, the radiation solution disperses the metal, the metal oxides, the conductive polymer, the carbon nanotube, the graphene, or a combination thereof as a solvent, together with a binder. In detail, the metal includes copper (Cu), aluminum (Al), gold (Au), silver (Ag), titanium (Ti), palladium (Pd), chromium (Cr) or a combination thereof and the metal oxide includes indium tin oxide (ITO), antimony tin oxide (ATO), aluminum zinc oxide (AZO), or a combination thereof. The conductive polymer includes the above-mentioned materials. Other methods for forming a metal mesh electrode by the electrospinning method are general and therefore, the detailed description thereof will be omitted. In addition, the formation of the metal mesh electrode may be formed by various methods, in addition to the electrospinning method. The description of the known method for forming the metal mesh electrode will be omitted. 
         [0087]    As set forth above, the exemplary embodiments of the present invention can increase the substantial area of the active region by bending the inactive region to the side of the touch panel. 
         [0088]    In addition, the exemplary embodiments of the present invention can integrate the touch panel with the FPC by integrally forming the extension part corresponding to the FPC according to the prior art with the transparent substrate, instead of the method according to the prior art that connects the separately disposed FPC to the transparent substrate. 
         [0089]    Although the embodiment of the present invention has been disclosed for illustrative purposes, it will be appreciated that a touch panel according to the invention is not limited thereto, and those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention. 
         [0090]    Accordingly, any and all modifications, variations or equivalent arrangements should be considered to be within the scope of the invention, and the detailed scope of the invention will be disclosed by the accompanying claims.