Abstract:
On a resin substrate ( 2 ) there are laminated, in the stated order, a conductive layer in which a bridge electrode ( 3   b ) and leads are formed, a first interlayer insulating layer ( 4 ), and an electrode layer that allows through visible light forming a unit electrode ( 5 XU) of a drive electrode line ( 5 X) and a unit electrode ( 5 YU) of a sensing electrode line ( 5 Y). It is accordingly possible to realize a touch panel substrate ( 1 ) capable of minimizing any increases in thickness, decreases in transmittance, complexity of terminal portions, and deterioration in optical characteristics.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a touch panel substrate and a display device including the touch panel substrate. 
       BACKGROUND ART 
       [0002]    In recent years, in order to achieve device miniaturization, display devices having a touch panel function in which the display unit and the input unit are integrally formed are in wide use. In particular, in mobile terminals such as mobile phones, PDAs (personal digital assistants), and table PCs, display devices having touch panels that can detect a position of contact if a finger or an input stylus is brought into contact with the surface of the display unit are widely used. 
         [0003]    As touch panels, conventionally, various types of touch panels such as the so-called resistive film type (pressure-sensing) and the capacitive type are known, and among those, the so-called capacitive type touch panels using the capacitive method in which a contact position is detected by changes in capacitance are widely used in display devices for mobile devices. 
         [0004]    Such capacitive touch panels are installed outside of the display panel and are widely used. 
         [0005]    In Patent Document 1, for example, a conventional capacitive touch panel such as that shown in  FIG. 8  is disclosed. 
         [0006]    As shown, a display device  100  including a conventional capacitive touch panel is configured as follows. 
         [0007]    A liquid crystal display panel  111  includes a TFT substrate  114  and a color filter substrate  115 , and between the two substrates  114  and  115 , a liquid crystal layer (not shown) is sandwiched. 
         [0008]    An upper polarizing plate  112  is provided on the top surface of the liquid crystal display panel  111 , and a lower polarizing plate  113  is provided on the bottom surface of the liquid crystal display panel  111 . 
         [0009]    Also, on the bottom surface side of the liquid crystal display panel  111  (where the lower polarizing plate  113  is provided), a backlight  116  for radiating light to the liquid crystal display panel  111  is provided. 
         [0010]    As shown, on one end of the TFT substrate  114 , a driver circuit  103  and an FPC substrate  105  are provided. 
         [0011]    On the other hand, the touch panel substrate  107  is bonded to the liquid crystal display panel  111  through a first adhesive  108 , and on the surface of the touch panel substrate  107  facing the liquid crystal display panel  111 , a transparent electrode layer  110  to be a shield layer that blocks noise originating from the liquid crystal display panel  111  is provided. 
         [0012]    On the top surface of the touch panel substrate  107 , a front surface protective plate  101  is bonded by a second adhesive  109 . 
         [0013]    A conductive member  106  for connecting the transparent electrode layer  110  to be the shield layer to ground potential is provided, and in addition, a spacer  102  is inserted between the touch panel substrate  107  and the TFT substrate  114 . 
         [0014]    Also, the FPC substrate  104  is connected to a touch panel control circuit (not shown), and sensor electrodes provided on the top surface of the touch panel substrate  107  and a control circuit (not shown) of the touch panel are electrically connected to each other through the FPC substrate  104 . Also, an appropriate voltage such as ground potential is supplied through the FPC substrate  104  to the transparent electrode layer  110  provided on the bottom surface of the touch panel substrate  107 . Thus, the FPC substrate  104  is connected to input terminals provided on the top surface of the touch panel substrate  107 , and therefore, there is a need to provide wiring lines from the input terminals to the transparent electrode layer  110  provided on the bottom surface in order to electrically connect the input terminals to the transparent electrode layer  110 . 
         [0015]      FIG. 9  shows another example of a conventional capacitive touch panel disclosed in Patent Document 1. 
         [0016]    As shown, on the bottom surface of the touch panel substrate  125 , a shield layer  110  is formed, while on the top surface of the touch panel substrate  125 , an X sensor layer  134  and a Y sensor layer  138  made of a transparent conductive layer are formed. On portions of the X sensor layer  134 , a wiring layer  135  made of a silver alloy is formed, and on the top surface of the touch panel substrate  125 , a first insulating layer  136 , contact holes  137  formed in the first insulating layer  136 , and a second insulating layer  139  are provided. 
         [0017]    A connecting terminal  127  has a structure in which the wiring layer  135  made of the silver alloy, and the Y sensor layer  138  are layered on the X sensor layer  134 . 
         [0018]    Non-Patent Document 1 discloses the possibility of attaining a thin touch panel substrate  200  by forming a polyimide film on a glass substrate, then forming a sensor electrode layer, and peeling away the glass substrate, as shown in  FIG. 10 . 
         [0019]    As shown in  FIG. 10 , the thin touch panel substrate  200  has a structure in which a buffer layer  202 , electrode layers  203  made of a transparent conductive layer, an interlayer insulating layer  204 , a conductive layer  205  for connecting two electrically separated electrode layers  203  through contact holes formed in the interlayer insulating layer  204 , and an anti-reflective layer  206  are layered in that order on the polyimide substrate  201 . 
         [0020]    Also, Patent Document 2 discloses a display device including a touch panel such as that shown in  FIG. 11 . 
         [0021]    As shown, the touch panel substrate  304  is made of PET at a thickness of 0.1 to 0.2 mm, and an X sensor pattern  303  is formed on the top surface of the touch panel substrate  304 , and a Y sensor pattern  306  is formed on the bottom surface of the touch panel substrate  304 . 
         [0022]    On the bottom surface of another PET substrate  309 , a shield layer  310  is formed, and a hard coat material  312  for protecting the shield layer  310  is provided. 
         [0023]    A surface panel  301  is bonded from the top side of the touch panel substrate  304  through an optical adhesive  302 , and the other PET substrate  309  is bonded from the bottom side of the touch panel substrate  304  through an optical adhesive  305 . 
       RELATED ART DOCUMENTS 
     Patent Documents 
       [0000]    
       
         Patent Document 1: Japanese Patent Application Laid-Open Publication, “Japanese Patent Application Laid-Open Publication No. 2010-086498 (Published on Apr. 15, 2010)” 
         Patent Document 2: Japanese Patent Application Laid-Open Publication, “Japanese Patent Application Laid-Open Publication No. 2011-90657 (Published on May 6, 2011)” 
       
     
       Non-Patent Document 
       [0000]    
       
         Non-Patent Document 1: C.-P. Kung, Ultra-Thin High-Transparency Projective Capacitive Touch Sensing Film, SID 10 DIGEST, 449-452, (2010) 
       
     
       SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
       [0027]    However, a display device including the conventional capacitive touch panel disclosed in Patent Document 1 and shown in  FIGS. 8 and 9  has the following problems. 
         [0028]    The first problem is that in display devices that include capacitive touch panels, the thicker the capacitive touch panel substrate is, the thicker the display device is. The second problem is that the capacitive touch panel is stacked on the outside of the display panel, and thus, display quality of the display device decreases due to decrease in transmittance by the touch panel substrate. The third problem is that the sensor layers and the shield layers are formed on both surfaces of the touch panel substrate, and thus, it is not possible to form terminals on the same surface, which makes the configuration of the terminal installation portion complex and connection difficult. The fourth problem is that the wiring  135  made of the silver alloy is patterned after first forming the X sensor layer  134 , and thus, when patterning the wiring layer  135 , the X sensor layer  134  is damaged, thus worsening optical characteristics of the touch panel. 
         [0029]    By using the configuration of the conventional capacitive touch panel disclosed in Non-Patent Document 1 and shown in  FIG. 10 , the first, second and third problems are mitigated to a certain extent, but in the configuration of the conventional capacitive touch panel shown in  FIG. 10 , the conductive layer  205  is patterned after forming the electrode layer  203 , and thus, when patterning the conductive layer  205 , the electrode layer  203  and the interlayer insulating layer  204  are damaged, which results in worsened optical characteristics in the touch panel, and fails to mitigate the fourth problem described above. 
         [0030]    One method to mitigate the fourth problem described above is to use the configuration of the conventional touch panel shown in  FIG. 11 , but with such a configuration, an X sensor pattern  303  is formed on one side of the touch panel substrate  304  made of an already formed resin film made of PET or the like at a thickness of 0.2 mm, and a Y sensor pattern  306  is formed on the other side of the touch panel substrate  304 , and in order to provide the shield layer  310 , another PET substrate  309  besides the touch panel substrate  304  is used, and thus, the substrate as a whole becomes thick and the transmittance thereof is decreased, which means that the first problem and the second problem cannot be mitigated. 
         [0031]    In the configuration above, the X sensor pattern  303 , the Y sensor pattern  306 , and the shield layer  310  are all formed as different layers, and thus, the third problem in which the terminals cannot be formed in the same layer, the terminal installing portion becomes complex, and connection becomes difficult cannot be mitigated. 
         [0032]    The present invention takes into account the above-mentioned problems, and an object thereof is to provide a touch panel substrate by which it is possible to mitigate an increase in thickness, a decrease in transmittance, increasing complexity of the terminals, and a worsening of optical characteristics. 
       Means for Solving the Problems 
       [0033]    In order to solve the above-mentioned problem, a touch panel substrate of the present invention includes, over a substrate, position detection electrodes that detect a coordinate position of an object to be detected by a change in capacitance, wherein the substrate is a resin substrate that allows through visible light and that has a glass transition point of 150° or greater, wherein the position detection electrodes include a plurality of first electrodes arranged in a first direction, and a plurality of second electrodes arranged in a second direction that intersects with the first direction, wherein, at intersections between the first electrodes and the second electrodes, either unit electrodes of the first electrodes or unit electrodes of the second electrodes that are respectively disposed to be adjacent to each other without overlapping in a plan view are electrically connected by a bridge electrode, the other thereof being electrically connected to each other over a first insulating layer that is formed over the bridge electrode, and wherein, on the resin substrate, a conductive layer that makes up the bridge electrode and wiring lines, the first insulating layer, and an electrode layer that makes up the unit electrodes of the first electrodes and the unit electrodes of the second electrodes and that allows through visible light are layered in this order. 
         [0034]    According to the configuration above, one resin substrate is used as the substrate of the touch panel substrate, and the one substrate is a resin substrate that allows through visible light, and that has a glass transition point of 150° or greater, and thus, it is possible to mitigate an increase in thickness of the touch panel substrate or a decrease in transmittance due to the substrate. 
         [0035]    Also, according to the configuration above, a conductive layer that forms the bridge electrodes and the respective wiring lines, and the electrode layer that allows through visible light and that forms the unit electrodes of the first electrodes and the unit electrodes of the second electrodes are formed on one surface of the resin substrate, and thus, it is possible to form the terminal portion on one surface of the resin substrate. Therefore, it is possible to mitigate increased complexity of the terminal installation portion, and it is possible to connect the respective elements with relative ease. 
         [0036]    Also, according to the configuration above, on the resin substrate, a conductive layer that forms the bridge electrodes and respective wiring lines, the first insulating layer, and an electrode layer that forms the unit electrodes of the first electrodes and the unit electrodes of the second electrodes and that allows through visible light are layered in that order. 
         [0037]    Therefore, the electrode layer and the first insulating layer are formed above the conductive layer, and thus, during patterning of the conductive layer, the electrode layer and the first insulating layer are not yet formed, which means that the electrode layer and the first insulating layer are not damaged during patterning of the conductive layer. 
         [0038]    The patterning of the conductive layer is performed on the highly planarized resin substrate, and thus, it is possible to form fine wiring lines. 
         [0039]    Therefore, it is possible to form fine wiring lines while mitigating worsening optical characteristics in the touch panel substrate. 
         [0040]    Thus, it is possible to attain a touch panel substrate by which it is possible to mitigate increase in thickness, decrease in transmittance, increase in complexity of the terminal portion, and worsening of optical characteristics. 
       Effects of the Invention 
       [0041]    As stated above, in a touch panel substrate according to the present invention, the substrate is a resin substrate that allows through visible light and that has a glass transition point of 150° or greater, the position detection electrodes include a plurality of first electrodes arranged in a first direction, and a plurality of second electrodes arranged in a second direction that intersects with the first direction, at intersections between the first electrodes and the second electrodes, either unit electrodes of the first electrodes or unit electrodes of the second electrodes that are respectively disposed to be adjacent to each other without overlapping in a plan view are electrically connected by a bridge electrode, the other thereof being electrically connected to each other over a first insulating layer that is formed over the bridge electrode, and on the resin substrate, a conductive layer that makes up the bridge electrode and wiring lines, the first insulating layer, and an electrode layer that makes up the unit electrodes of the first electrodes and the unit electrodes of the second electrodes and that allows through visible light are layered in this order. 
         [0042]    Thus, it is possible to attain a touch panel substrate by which it is possible to mitigate increase in thickness, decrease in transmittance, increase in complexity of the terminal portion, and worsening of optical characteristics. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0043]      FIG. 1  is a cross-sectional view of a touch panel substrate provided in a liquid crystal display device of an embodiment of the present invention along the line A-A′ shown in  FIG. 3 , and shows an intersection between a sensing electrode line and a drive electrode line. 
           [0044]      FIG. 2  is a cross-sectional view of the touch panel substrate provided in the liquid crystal display device of the embodiment of the present invention along the line B-B′ shown in  FIG. 3 , and shows a terminal portion for a ground potential wiring line. 
           [0045]      FIG. 3  is a plan view of the touch panel substrate included in the liquid crystal display device of the embodiment of the present invention. 
           [0046]      FIG. 4  shows manufacturing steps for the liquid crystal display device of the embodiment of the present invention. 
           [0047]      FIG. 5  shows the liquid crystal display device of the embodiment of the present invention including a touch panel substrate provided with COG (LSI). 
           [0048]      FIG. 6  is a plan view showing a schematic configuration of a touch panel substrate provided in a liquid crystal display device of another embodiment of the present invention. 
           [0049]      FIG. 7  is a plan view showing a schematic configuration of a touch panel substrate provided in a liquid crystal display device of yet another embodiment of the present invention. 
           [0050]      FIG. 8  shows a schematic configuration of a conventional capacitive touch panel disclosed in Patent Document 1. 
           [0051]      FIG. 9  shows another example of a conventional capacitive touch panel disclosed in Patent Document 1. 
           [0052]      FIG. 10  shows a conventional thin touch panel substrate disclosed in Non-Patent Document 1. 
           [0053]      FIG. 11  shows a schematic configuration of a conventional capacitive touch panel disclosed in Patent Document 2. 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0054]    Below, embodiments of the present invention will be explained in detail with reference to figures. However, dimensions, materials, shapes, positional relationships, and the like of constituting members described in these embodiments are merely individual embodiment examples, and the scope of the present invention shall not be narrowly interpreted by being limited thereto. 
         [0055]    In the respective embodiments below, examples are described of a liquid crystal display device, which includes a touch panel substrate of the present invention and a liquid crystal display panel, as the display device, but the configuration is not limited thereto, and the display device may be an organic EL display device including the touch panel substrate of the present invention and an organic EL display panel having an organic light-emitting layer, or an electrophoretic display device including the touch panel substrate of the present invention and an electrophoretic display panel. 
       Embodiment 1 
       [0056]    Embodiment 1 of the present invention will be described below with reference to  FIGS. 1 to 5 . 
         [0057]      FIG. 3  is a plan view that shows a touch panel substrate  1 . 
         [0058]    As shown, a plurality of drive electrode lines  5 X arranged with prescribed gaps therebetween in a first direction (up-and-down direction in the drawing), and a plurality of sensing electrode lines  5 Y arranged with prescribed gaps therebetween in a second direction (left-and-right direction in drawing) are formed on a substrate  2  so as to intersect each other. 
         [0059]    The drive electrode lines  5 X are constituted of adjacent unit electrodes  5 XU, and connecting portions  5 XC that connect adjacent unit electrodes  5 XU, and the sensing electrode lines  5 Y are constituted of adjacent unit electrodes  5 YU that are electrically separate from each other, and bridge electrodes  3   b  that electrically connect electrically separated adjacent unit electrodes  5 YU. 
         [0060]      FIG. 1  is a cross-sectional view of the touch panel substrate  1  shown in  FIG. 3  along the line A-A′, and shows the intersection between the drive electrode line  5 X and the sensing electrode line  5 Y. 
         [0061]    As shown in  FIG. 1 , in the intersection between the drive electrode line  5 X and the sensing electrode line  5 Y constituting position detection electrodes that detect the coordinate position of an object to be detected by changes in capacitance, the electrically separate adjacent unit electrodes  5 YU that constitute the sensing electrode line  5 Y are electrically connected to each other through the bridge electrodes  3   b.    
         [0062]    In the present embodiment, two contact holes  4 C formed in a first interlayer insulating film  4  covering the bridge electrode  3   b  are used in order to electrically connect the respective electrically separated adjacent unit electrodes  5 YU to the common bridge electrode  3   b , thus electrically connecting the electrically separated adjacent unit electrodes  5 YU, but the configuration is not limited thereto, and the electrically separated adjacent unit electrodes  5 YU may respectively be formed on the one common bridge electrode  3   b  without the use of contact holes. 
         [0063]    The connecting portion  5 XC of the drive electrode line  5 X is formed on the first interlayer insulating film  4  formed on the bridge electrode  3   b.    
         [0064]    Thus, as shown, in the intersection between the drive electrode line  5 X and the sensing electrode line  5 Y, the first interlayer insulating film  4  insulates the drive electrode line  5 X from the sensing electrode line  5 Y. 
         [0065]    A second interlayer insulating film  6  is formed so as to cover the drive electrode line  5 X, the unit electrodes  5 YU of the sensing electrode line  5 Y, and the first interlayer insulating film  4 , and a shield electrode  7  is formed so as to cover the second interlayer insulating film  6 . 
         [0066]    According to this configuration, a shield electrode  7  that blocks external signal noise is provided, and thus, a touch panel substrate  1  with a high detection accuracy can be attained. 
         [0067]    In the present embodiment, a polyimide substrate made of polyimide at a thickness of a few μm to a few tens of μm is used as the substrate  2 . 
         [0068]    It is preferable that the polyimide substrate have a high transmittance in the visible light spectrum. 
         [0069]    By using such a polyimide substrate, it is possible to mitigate an increase in thickness or a decrease in transmittance in the touch panel substrate that could otherwise occur depending on the substrate used. 
         [0070]    Also, it is possible to bend the touch panel substrate. 
         [0071]    The substrate  2  can be made of a substrate other than the polyimide substrate, and any substrate can be used as long as it allows through visible light, and as long as it is a resin substrate having a glass transition point of 150° or higher. 
         [0072]    Also, in the present embodiment, a polyimide layer to be the polyimide substrate is formed on a support glass substrate that supports the polyimide substrate, and the polyimide layer is peeled from the support glass substrate, thus forming the polyimide substrate. 
         [0073]    When peeling the polyimide substrate from the support glass substrate, it is preferable that light such as a laser beam be radiated on the polyimide substrate and the support glass substrate, thus decreasing the bonding strength between the polyimide layer and the support glass substrate, and peeling off the polyimide substrate thereafter. 
         [0074]    According to this configuration, the polyimide substrate can be formed thin, and it is possible to achieve a thin touch panel substrate  1 . 
         [0075]    As shown in  FIG. 3 , the respective wiring lines  3 L connected to the drive electrode lines  5 X and the sensing electrode lines Y are provided in the periphery of the position detection electrode formation region including the plurality of drive electrode lines  5 X and the plurality of sensing electrode lines  5 Y, and the wiring lines  3 L are drawn to the terminal portion formed on one end of the substrate  2 . 
         [0076]    Further to the outside than the wiring lines  3 L, ground potential wiring lines  3 L′ that are grounded are provided, and like the wiring lines  3 L are drawn to the terminal portion formed on one end of the substrate  2 . 
         [0077]    In other words, as shown in  FIG. 3 , it is preferable that the ground potential wiring lines  3 L′ be formed so as to surround the periphery, thereby increasing the resistance to noise coming from a horizontal direction, and increasing resistance to ESD damage that would occur during the manufacturing process. 
         [0078]    The wiring lines  3 L and the ground potential wiring line  3 L′ are formed in the same layer as the bridge electrodes  3   b , and in the terminal portion of the substrate  2 , the electrode layer  5 L that forms the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode line  5 Y is layered on the on the wiring lines  3 L and the ground potential wiring lines  3 L′. 
         [0079]      FIG. 2  is a cross-sectional view of the touch panel substrate  1  shown in  FIG. 3  along the line B-B′, and shows the terminal portion of the ground potential wiring line  3 L′. 
         [0080]    As shown, in the terminal portion of the substrate  2 , the electrode layer  5 L forming the drive electrode line  5 X and the unit electrodes  5 YU of the sensing electrode line  5 Y, and the electrode layer  7 L forming the shield electrode  7  are layered on the ground potential wiring line  3 L′. 
         [0081]    According to the configuration above, it is possible to electrically connect the shield electrode  7  to the ground potential wiring line  3 L′ with relative ease. 
         [0082]    In such a case, by grounding only the terminal portion of the ground potential wiring line  3 L′, it is also possible to ground the shield electrode  7 , and thus, it is possible to simplify the connection between the shield electrode  7  and the outer portion of the ground potential wiring line  3 L′. 
         [0083]    In the present embodiment, although not shown, the wiring lines  3 L and the ground potential wiring line  3 L′ are formed of the same layer as the bridge electrode  3   b , and thus, the first interlayer insulating layer  4  is formed so as to cover the wiring lines  3 L and the ground potential wiring line  3 L′. 
         [0084]    Therefore, because the respective wiring lines  3 L and  3 L′ are covered by the first interlayer insulating layer  4 , it becomes possible to make the respective wiring lines  3 L and  3 L′ durable when patterning the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y, and it is possible to improve reliability. 
         [0085]    The formation region for the second interlayer insulating layer  6  and the shield electrode  7  will be described with reference to  FIG. 3 . 
         [0086]    As shown, the second interlayer insulating layer  6  is formed in the region indicated with the inner dotted line, which is the formation region for the position detection electrodes in  FIG. 3 , and in  FIG. 3 , the shield electrode  7  is formed in the region indicated with the outer dotted line. Thus, in the present embodiment, only the first interlayer insulating layer  4  is formed on the wiring lines  3 L and the ground potential wiring line  3 L′. 
         [0087]    Thus, in the formation region for the position detection electrodes where the second interlayer insulating layer  6  is formed, the shield electrode  7  is formed on the second interlayer insulating layer  6 , and in the region peripheral to where the position detection electrodes are formed where only the first interlayer insulating layer  4  is formed, the shield electrode  7  is formed on the first interlayer insulating layer  4 . 
         [0088]    With such a configuration, it is possible to attain an even thinner touch panel substrate  1 . 
         [0089]    In the present embodiment, in order to make the connection with the FPC easier, as shown, in the terminal portion, the first interlayer insulating layer  4  is formed on the respective wiring lines  3 L and  3 L′ so as to maintain insulation therebetween without forming both the first interlayer insulating layer  4  and the second interlayer insulating layer  6 . 
         [0090]    In the touch panel substrate  1  described above, the conductive layer  3  that forms the bridge electrodes  3   b  and the respective wiring lines  3 L and  3 L′, the electrode layer that forms the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y, and the shield electrode  7  are formed on one surface of the substrate  1 , and thus it is possible to form the terminal portion on one surface of the substrate  2 . Therefore, despite the shield electrode  7  being provided, it is possible to mitigate an increase in complexity of the terminal installation portion, and it is possible to have a relatively easy connection without the use of other conductive members. 
         [0091]    Also, in the touch panel substrate  1  described above, the conductive layer that forms the bridge electrodes  3   b  and the respective wiring lines  3 L and  3 L′, the first interlayer insulating layer  4 , the electrode layer that forms the drive electrode line  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y are layered in that order on the substrate  2 . 
         [0092]    Therefore, because the electrode layer is above the conductive layer, during patterning, the electrode layer has not yet been formed, and thus, there is no damage to the electrode layer or the first interlayer insulating layer during patterning (dry etching, for example) of the conductive layer. Thus, it is possible to mitigate worsening of optical characteristics of the touch panel substrate  1 . 
         [0093]    It is possible to perform detailed patterning on the conductive layer  3  through dry etching without damaging the electrode layer or the first interlayer insulating layer, and thus, it is possible to form the respective wiring lines  3 L and  3 L′ in a small region, which allows for a small frame region. 
         [0094]    Thus, it is possible to attain a touch panel substrate  1  by which it is possible to mitigate increase in thickness, decrease in transmittance, increase in complexity of the terminal portion, and worsening of optical characteristics. 
         [0095]    As shown in  FIG. 3 , in the present embodiment, in the terminal portion of the touch panel substrate  1 , the electrode layer  5 L that forms the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode line  5 Y is layered on the respective wiring lines  3 L connected to the drive electrode lines  5 X and the sensing electrode line  5 Y in the terminal portion of the touch panel substrate  1 , but the configuration is not limited thereto as long as at least one layer among the electrode layer  5 L and the layer forming the shield electrode  7  is layered on the respective wiring lines  3 L. 
         [0096]    As shown in  FIG. 3 , in the present embodiment, the electrode layer  5 L forming the drive electrode line  5 X and the unit electrodes  5 YU of the sensing electrode line  5 Y and the layer forming the shield electrode  7  are layered on the ground potential wiring lines  3 L′ in the terminal portion of the touch panel substrate  1 , but the shield electrode  7  may be the only layer formed. Also, if it is necessary to connect the ground potential wiring line  3 L′ to the shield electrode  7 , only the electrode layer  5 L may be formed on the ground potential wiring line  3 L′. 
         [0097]    As described above, in the terminal portion, the electrode layer  5 L and the shield electrode  7  made of ITO (indium tin oxide), IZO (indium zinc oxide), or the like are formed on the respective wiring lines  3 L and  3 L′, and thus, it is possible to mitigate corrosion of the respective wiring lines  3 L and  3 L′. 
         [0098]    Also, in the present embodiment, it is possible to form the conductive layer  3  that forms the bridge electrodes  3   b  and the respective wiring lines  3 L and  3 L′ of a metal such as a low resistance metal such as titanium (Ti), copper (Cu), gold (Au), aluminum (Al), tungsten (W), zinc (Zn), nickel (Ni), tin (Sn), chromium (Cr), molybdenum (Mo), or tantalum (Ta), a metal compound or metal silicide thereof, or the like. A layered metal can also be used. 
         [0099]    The electrode layer forming the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y and the shield electrode  7  can be made of ITO (indium tin oxide) or IZO (indium zinc oxide) that allows through visible light. 
         [0100]    The first interlayer insulating layer  4  and the second interlayer insulating layer  6  can be made of an inorganic material such as a photosensitive acrylic resin, a silicon nitride film, a silicon oxide film, or a silicon nitride oxide film, or a hybrid material including a mixture of an organic material and an inorganic material. 
         [0101]    In the present embodiment, the conductive layer  3  that forms the bridge electrodes  3   b  and the respective wiring lines  3 L and  3 L′ are formed on the substrate  2 , but the conductive layer  3  may be formed after forming a nitride film to be a barrier layer on the substrate  2 . 
         [0102]    In the present embodiment, the first interlayer insulating layer  4  is a resin layer, and is formed so as to cover the only the bridge electrodes  3   b  and the respective wiring lines  3 L and  3 L′. The second interlayer insulating layer  6  is also made of a resin layer. 
       (Liquid Crystal Display Device) 
       [0103]      FIG. 4  shows the manufacturing process for the liquid crystal display device  20  including the touch panel substrate  1 . 
         [0104]      FIG. 4(   a ) shows a case in which the touch panel substrate  1  shown in  FIG. 3  is formed on the support substrate  8 , and does not show the first interlayer insulating layer  4 . 
         [0105]    In the terminal portion, the electrode layer  5 L that forms the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y is formed on the respective wiring lines  3 L connected to the drive electrode lines  5 X and the sensing electrode line  5 Y, and the FPC  9  is connected thereto from above. 
         [0106]    On the other hand, although not shown, on both ends of the terminal portion, the electrode layer  5 L that forms the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y and the shield electrode  7  are layered on the ground potential wiring line  3 L′ and the FPC  9  is connected thereto from above. 
         [0107]    Then, as shown in  FIG. 4(   b ), the FPC  12  is connected to the liquid crystal display panel  10 , which includes the upper polarizing plate  11   a  on the top surface (display surface) thereof and the lower polarizing plate  11   b  on the bottom surface thereof. The upper polarizing plate  11   a  is bonded to the FPC  9  and the shield electrode  7  through the adhesive layer  13 , with the support substrate  8  being on top. 
         [0108]    Then, as shown in  FIG. 4(   c ), the support substrate  8  is removed by radiating light such as a laser beam. 
         [0109]    Lastly, as shown in  FIG. 4(   d ), the substrate  2  and the protective plate  15  are bonded to each other through the adhesive layer  14 , which completes the liquid crystal display device  20  including the touch panel substrate  1 . 
         [0110]    The liquid crystal display device  20  includes the touch panel substrate  1  by which it is possible to mitigate an increase in thickness, a decrease in transmittance, increasing complexity of the terminals, and a worsening of optical characteristics, and thus, it is possible to attain a thin display device with improved display quality. 
       Modification Example 
       [0111]      FIG. 5  shows a liquid crystal display device  20   a  including a touch panel substrate provided with a COG  16  (LSI). 
         [0112]    As shown, in the touch panel substrate including the liquid crystal display device  20   a , the installation portion for the FPC  9  is located far from the protective plate  15 . 
         [0113]    Also, as shown, the installation surface on the touch panel substrate is opposite to the protective plate  15 , and thus, it is possible to install the COG  16  (LSI) without taking into consideration the thickness of the protective plate  15 , the touch panel substrate, and the adhesive layer  14 , and thus, it is possible to simplify peripheral circuits of the touch panel substrate. 
         [0114]    The COG  16  (LSI) is electrically connected to the respective wiring lines  3 L and  3 L′ through the shield electrode  7 . 
       Embodiment 2 
       [0115]    Embodiment 2 of the present invention will be described with reference to  FIG. 6 . In a touch panel substrate  1   a  of the present embodiment, the shape of the shield electrode  7   a  differs from that of Embodiment 1. Other configurations are the same as described in Embodiment 1. For ease of description, members that have the same functions as members shown in drawings of Embodiment 1 will be assigned the same reference characters, and descriptions thereof will be omitted. 
         [0116]      FIG. 6  is a plan view that schematically shows a touch panel substrate  1   a.    
         [0117]    As shown, the shield electrode  7   a  in the touch panel substrate  1   a  has a small area of overlap with the unit electrodes  5 XU of the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y in a plan view. 
         [0118]    In other words, the shield electrode  7   a  of the touch panel substrate  1   a  has line portions respectively aligned in a first direction (up-and-down direction in the drawing) and a second direction (left-and-right direction in the drawing) so as to intersect at intersections between the drive electrode lines  5 X and the sensing electrode lines  5 Y. 
         [0119]    The shield electrode  7   a  has a small area of overlap with the unit electrodes  5 XU of the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y in a plan view, and has line portions that can be patterned at a high degree of accuracy. Also, the line portions overlap the centers of the unit electrodes  5 XU of the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y, and can efficiently reduce noise. 
         [0120]    The shape of the shield electrode  7   a  is not limited to the shape shown in  FIG. 6  as long as the area of overlap with the unit electrodes  5 XU of the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y is small in a plan view. 
         [0121]    If the area of overlap between the shield electrode and the unit electrodes  5 XU of the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y is large in a plan view, then if the second interlayer insulating layer  6  were to be made thin, the capacitance would increase, which makes sensing difficult. 
         [0122]    As shown in  FIG. 6 , if the area of overlap between the shield electrode and the unit electrodes  5 XU of the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y is small, then it is possible to form the second interlayer insulating layer  6  thin, and it is possible to make the touch panel substrate  1  as a whole thin while mitigating the effect of noise. 
       Embodiment 3 
       [0123]    Embodiment 3 of the present invention will be described with reference to  FIG. 7 . The touch panel substrate  1   b  of the present embodiment differs from that of Embodiments 1 and 2 in that protective films made of a PET film that can be bent are provided on the top and bottom surfaces of a touch panel substrate  1   b , and in that the touch panel substrate  1   b  can be formed on a curved surface. Other configurations are the same as described in Embodiment 1. For ease of description, members that have the same functions as members shown in drawings of Embodiment 1 will be assigned the same reference characters, and descriptions thereof will be omitted. 
         [0124]      FIG. 7  is a plan view that schematically shows a touch panel substrate  1   b.    
         [0125]    In the touch panel substrate  1   b , after the substrate  2  of the touch panel substrate formed on a support substrate (not shown) and a protective film  19  made of a bendable PET film or the like are bonded together through an adhesive layer  17   b  and the support substrate (not shown) is removed, the protective film  18  is bonded through an adhesive layer  17   a  on the surface of the substrate  2  of the touch panel substrate opposite to the surface where the protective film  19  is formed. 
         [0126]    By forming the bonding portion (protective film  18 ) of the touch panel substrate  1   b  as a flexible substrate, a flexible touch panel substrate  1   b  can be attained. 
         [0127]    Also, in the touch panel substrate  1   b , after the respective layers requiring high temperature processes are formed on the support substrate, the protective film  18  made of a flexible PET film or the like is bonded through the adhesive layer, and the support substrate is removed by radiation with light such as a laser, and thus, there is no need to form the ITO layer and the like that forms the unit electrodes  5 XU of the drive electrode lines  5 X and the unit electrodes  5 YU of the sensing electrode lines  5 Y at a temperature at or below 150° C., which is the glass transition point Tg of PET films and the like, and thus, a high quality low resistance ITO layer can be formed. 
         [0128]    Also, the mounting of the FPC  9  on the support substrate is performed in a step requiring a high temperature process, and thus, when mounting, there is no deformation of the protective film  18  made of a PET film or the like. 
         [0129]    The resin substrate of the touch panel substrate of the present invention may be formed by forming a resin layer to be the resin substrate on a support substrate and peeling the resin layer from the support substrate. 
         [0130]    According to the configuration above, the resin substrate is formed by forming a resin layer to be the resin substrate on the support substrate and peeling the resin layer from the support substrate, and thus, it is possible to form the resin substrate so as to be thin, and to attain a thin touch panel substrate. 
         [0131]    In the touch panel substrate of the present invention, it is preferable that the first insulating layer be formed so as to cover the wiring lines. 
         [0132]    According to the configuration above, the respective wiring lines are covered by the first insulating layer, and thus, during patterning of the electrode layer, it is possible for the respective wiring lines to be durable, thereby improving reliability. 
         [0133]    In the touch panel substrate of the present invention, it is preferable that the first insulating layer be a resin layer and be formed so as to cover only the bridge electrode and the wiring lines. 
         [0134]    According to the configuration above, no first insulating layer is present below the unit electrodes of the first electrodes and the unit electrodes of the second electrodes, and thus, it is possible to attain a touch panel substrate having high transmittance and good optical characteristics. 
         [0135]    Also, according to the configuration above, the conductive layer that forms the bridge electrodes and the wiring lines, the first insulating layer, and the electrode layer, which allows through visible light and forms the unit electrodes of the first electrodes and the unit electrodes of the second electrodes, are layered in that order, and thus, even when forming the first insulating layer in a prescribed shape, no damage is done to the unit electrodes of the first electrodes and the unit electrodes of the second electrodes. 
         [0136]    The first insulating layer is a resin layer, and thus, it is flexible during bonding, and with the first insulating layer, it is also possible to form a touch panel with a curved surface. 
         [0137]    It is preferable that the resin substrate of the touch panel substrate of the present invention be formed of polyimide. 
         [0138]    According to the configuration above, the resin substrate can be formed so as to be thin using a PET film or the like, for example, and is formed of polyimide, which has excellent durability, and a high quality electrode layer can be formed on the resin substrate, and thus, it is possible to attain a high quality and thin touch panel substrate. 
         [0139]    According to the configuration above, the resin substrate can be formed so as to be thin, and thus, it is possible to attain a curved touch panel substrate. 
         [0140]    It is preferable that the resin substrate of the touch panel substrate of the present invention further include, over the resin substrate, a second insulating layer that is formed so as to cover at least the electrode layer, and a shield electrode layer that is formed so as to cover at least the second insulating layer, the shield electrode layer allowing through visible light. 
         [0141]    According to the configuration above, a shield electrode layer that blocks external signal noise is provided, and thus, a touch panel substrate with a high detection accuracy can be attained. 
         [0142]    Also, according to the configuration above, the shield electrode layer is provided on one surface of the resin substrate along with the electrode layer, and thus, despite the fact that the shield electrode layer is provided, it is possible to mitigate increased complexity of the terminal installation portion, and it is possible to connect the elements with relative ease. 
         [0143]    It is preferable that the touch panel substrate of the present invention further include, over the resin substrate, a second insulating layer that is formed so as to cover at least the electrode layer, and a shield electrode layer formed over at least the second insulating layer, the shield electrode layer allowing through visible light, and that the shield electrode layer be formed such that areas thereof that overlap the unit electrodes of the first electrodes and the unit electrodes of the second electrodes are small in a plan view. 
         [0144]    According to the configuration above, the shield electrode layer has a small area of overlap with the unit electrodes of the first electrodes and the unit electrodes of the second electrodes in a plan view, and thus, it is possible to form the second insulating layer so as to be thin, allowing a thin touch panel substrate to be attained. 
         [0145]    It is preferable that the shield electrode layer of the touch panel substrate of the present invention have line portions respectively aligned in the first direction and the second direction so as to intersect at the intersections between the first electrodes and the second electrodes. 
         [0146]    According to the configuration above, the shield electrode layer has a small area of overlap with the unit electrodes of the first electrodes and the unit electrodes of the second electrodes in a plan view, and has line portions that can be patterned at a high degree of accuracy. Also, the line portions overlap the centers of the unit electrodes of the first electrodes and the unit electrodes of the second electrodes, and thus, it is possible to reduce noise efficiently. 
         [0147]    Therefore, it is possible to form the second insulating layer to be thin, and to attain a thin touch panel substrate. 
         [0148]    In the touch panel substrate of the present invention, it is preferable that the second insulating layer be a resin layer. 
         [0149]    According to the configuration above, the second insulating layer is a resin layer, and thus, it is flexible during bonding, and with the second insulating layer, it is also possible to form a touch panel with a curved surface. 
         [0150]    It is preferable that the touch panel substrate of the present invention further include, in a periphery of where the position detection electrodes are formed, a ground potential wiring line that is grounded and that is made of the conductive layer. 
         [0151]    According to the configuration above, ground potential wiring lines that are grounded and that are formed of the conductive layer are provided in the periphery of where the position detection electrodes are formed, and thus, it is possible to reduce noise from the horizontal direction, and it is possible to mitigate ESD damage, which can occur during the manufacturing process. 
         [0152]    In the touch panel substrate of the present invention, it is preferable that the shield electrode layer be electrically connected to a ground potential wiring line that is made of the conductive layer, the ground potential wiring line being provided in the periphery of where the position detection electrodes are formed and being grounded. 
         [0153]    According to the configuration above, the shield electrode layer, and the upper conductive layer that forms the ground potential wiring line are formed on one surface of the resin substrate, and thus, it is possible to electrically connect the shield electrode layer to the ground potential wiring line with relative ease. 
         [0154]    Also, in this case, by grounding only the terminal portion of the ground potential wiring line, it is possible to also ground the shield electrode layer, and thus, it is possible to simplify the connection between the shield electrode layer and the ground potential wiring line. 
         [0155]    In a terminal portion provided on one end of the resin substrate of the touch panel substrate of the present invention, it is preferable that at least either of the electrode layer and the shield electrode layer be layered on the wiring lines. 
         [0156]    According to the configuration above, in the terminal portion provided on one end of the resin substrate, at least one layer among the electrode layer and the shield electrode layer is layered on the respective wiring lines, and thus, a highly reliable terminal portion can be formed, and a highly reliable touch panel substrate can be attained. 
         [0157]    In a terminal portion provided on one end of the resin substrate of the touch panel substrate of the present invention, it is preferable that at least either of the electrode layer and the shield electrode layer be layered on a ground potential wiring line that is made of the conductive layer and that is grounded. 
         [0158]    According to the configuration above, on the terminal portion provided on one end of the resin substrate, at least one layer among the electrode layer and the shield electrode layer is layered on the ground potential wiring line, and thus, a highly reliable terminal portion can be formed, and a highly reliable touch panel substrate can be attained. 
         [0159]    It is preferable that the resin substrate of the touch panel substrate of the present invention further include a protective layer formed through an adhesive layer on at least one of a topmost layer of one surface side of the resin substrate on which respective layers are formed, and another surface side of the resin substrate. 
         [0160]    According to the configuration above, at least one surface of the touch panel substrate has formed thereon a protective layer, and thus, a highly durable and reliable touch panel substrate can be attained. 
         [0161]    It is preferable that the resin substrate of the touch panel substrate of the present invention further include a protective layer formed through an adhesive layer on a surface of the resin substrate opposite to one surface side on which respective layers are formed; and a driver circuit on the surface side on which the respective layers are formed. 
         [0162]    According to the configuration above, the one surface of the resin substrate of the touch panel substrate where the respective layers are formed (mounting surface) is disposed opposite to the protective layer, and thus, it is possible to mount the driver circuit (COG (LSI)) without needing to take into account the thickness of the adhesive layer provided between the protective layer and the resin substrate, and thus, it is possible to simplify the peripheral circuitry of the touch panel substrate. 
         [0163]    The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the claims. Therefore, embodiments obtained by appropriately combining the techniques disclosed in different embodiments are included in the technical scope of the present invention. 
       INDUSTRIAL APPLICABILITY 
       [0164]    The present invention can be suitably used in a touch panel and a display device including a touch panel. 
       DESCRIPTION OF REFERENCE CHARACTERS 
       [0000]    
       
         
           
               1 ,  1   a ,  1   b  touch panel substrate 
               2  substrate (resin substrate) 
               3  conductive layer 
               3   b  bridge electrode 
               3 L wiring line 
               3 L′ ground potential wiring line 
               4  first interlayer insulating layer (first insulating layer) 
               5 X drive electrode line 
               5 Y sensing electrode line 
               5 XU,  5 YU unit electrode 
               5 XC connecting portion 
               5 L electrode layer 
               6  second interlayer insulating layer (second insulating layer) 
               7 ,  7   a  shield electrode 
               7 L electrode layer 
               8  support substrate 
               9 ,  12  FPC 
               10  liquid crystal display panel (display panel) 
               11   a ,  11   b  polarizing plate 
               20 ,  20   a  liquid crystal display device 
               13 ,  14  adhesive layer 
               15  protective plate (protective layer) 
               17   a ,  17   b  adhesive layer 
               18 ,  19  protective film (protective layer)