JP5520093B2 - Manufacturing method of touch panel - Google Patents

Description

The present invention relates to a manufacturing method of the touch panel by the input position detection electrode is formed on the cover glass.

  Among various touch panels, for example, in a capacitive touch panel, a translucent input position detection electrode is formed on one surface of a glass substrate. The input position detection electrode is formed in the input region at the center of the glass substrate, and wiring is formed in the peripheral region outside the input region of the glass substrate. In a capacitive touch panel, a light-transmitting cover glass is disposed on the side where an input operation is performed on a glass substrate (see Patent Document 1).

JP 2009-259203 A

  In the touch panel, if the electrode for detecting the input position and the wiring are formed on the cover glass itself with a light-transmitting conductive film, a glass substrate separate from the cover glass can be omitted, so that the number of parts can be reduced. There is an advantage that it can be made thinner and lighter.

  However, when the wiring is formed on the cover glass, the flexible wiring board is connected to the cover glass. Therefore, when viewed from the input operation surface side, the connection portion of the flexible wiring board is visible, and the appearance is significantly reduced. There is a problem. Such deterioration in appearance is caused by the flexible wiring board being connected through the cover glass when viewed from the input operation surface even when the flexible wiring substrate is connected to the second surface side opposite to the first surface located on the input operation surface side in the cover glass. Since the connection part of the substrate is visible, the same occurs.

  On the other hand, in order to improve the appearance of the touch panel, a light-shielding printing layer may be provided in a peripheral area outside the input area of the cover glass, and this light-shielding printing layer is said to look good when viewed from the input operation surface side. From the viewpoint, it is formed on the second surface side of the cover glass. Therefore, on the second surface side of the cover glass, a light-shielding printing layer is formed before the input position detection electrodes and wiring are formed of the light-transmitting conductive film, and the flexible wiring board is hidden by the light-shielding printing layer. Can be considered. However, when a light-transmitting conductive film such as an ITO film is formed in a state where the light-shielding printed layer is formed on the cover glass, the light-transmitting conductive film is generated by the outgas generated from the light-shielding printed layer when the light-transmitting conductive film is formed. There is a problem that the transparency of the image is greatly reduced. For example, when an ITO (Indium Tin Oxide) film (translucent conductive film) is formed in a state where no print layer is present, the transmittance is 92% or more, but when a light-shielding print layer is present in the entire peripheral region, The transmittance of the ITO film decreases to 86% to 88%. Such a decrease in transmittance is not preferable because it causes the presence of the input position detection electrode to be conspicuous and also causes the image quality to deteriorate when the image is displayed through the touch panel.

In view of the above problems, an object of the present invention is to provide a light shielding property in which a flexible wiring board connected to a cover glass is provided on the second surface side opposite to the first surface located on the input operation surface side of the cover glass. even when hidden printing layer, light-shielding printed layer because the transmittance of the translucent conductive film constituting the input position detection electrode is to provide a method for manufacturing a touch panel capable of preventing a decrease There is.

  In order to solve the above problems, a touch panel according to the present invention includes a cover glass, a first surface side of the cover glass on the input operation surface side, and a second surface side opposite to the first surface. In any one of the above, the translucent conductive film constituting the translucent input position detecting electrode in the input area, the translucent peripheral wiring extending in the peripheral area outside the input area, and the cover A light-shielding printed layer formed in the peripheral region on the second surface side of the glass; a conductive film for mounting formed on the light-shielding printed layer and electrically connected to the peripheral wiring; and And a flexible wiring board electrically connected to the mounting conductive film on the second surface side.

  Moreover, the manufacturing method of the touchscreen which concerns on this invention is in the input area in any one of the 1st surface side by the side of the input operation surface of a cover glass, and the 2nd surface side opposite to this 1st surface. A translucent conductive film forming step of forming a translucent input position detecting electrode and a translucent conductive film constituting a peripheral wiring extending in a peripheral region outside the input region; and A light-shielding printing step for forming a light-shielding printing layer in the peripheral region on the second surface side; and a mounting conductive film for forming a mounting conductive film electrically connected to the peripheral wiring on the light-shielding printing layer. And a flexible wiring board connecting step of electrically connecting the flexible wiring board to the mounting conductive film on the light-shielding printed layer.

  In the present invention, “upper layer side” and “lower layer side” mean the positional relationship between a plurality of layers formed on the cover glass regardless of the vertical direction of the touch panel. Therefore, the “lower layer side” means the side close to the cover glass (the side formed in the previous step), and the “upper layer side” means the side far from the cover glass (the side formed in the subsequent step). ).

  In the present invention, the input position detecting electrode and the wiring are formed on the cover glass, and the input position detecting electrode and the wiring are not formed on the glass substrate separate from the cover glass. For this reason, since a glass substrate separate from the cover glass is not required, the number of components can be reduced, and the touch panel can be made thinner and lighter. Moreover, since the light-shielding printed layer is formed on the second surface side of the cover glass, the light-shielding printed layer looks as a smooth surface when viewed from the input operation surface side, and has a good appearance. In addition, a flexible wiring board is connected to the second surface side of the cover glass, but the flexible wiring board is mounted on the light-shielding printing layer. For this reason, since the light-shielding printing layer exists on the input operation surface side with respect to the flexible wiring substrate, the flexible wiring substrate cannot be seen from the input operation surface side (first surface side) of the cover glass. Furthermore, since the conductive film for mounting that is electrically connected to the peripheral wiring is formed on the light-shielding printed layer, even when the flexible wiring board is mounted on the light-shielding printed layer, the flexible wiring board and the wiring Can be electrically connected. Furthermore, the peripheral wiring and the mounting conductive film are separate, and after the peripheral wiring is formed, a light-shielding printed layer is formed, and then the mounting conductive film is formed. For this reason, since a light-transmitting conductive film can be formed before forming a light-shielding printing layer on a cover glass, the light-transmitting conductive film is not affected by the outgas generated from the light-shielding printing layer. . Therefore, since a highly transparent translucent conductive film can be formed, the presence of the input position detection electrode is not noticeable, and a high-quality image is displayed when the image is displayed through the touch panel. Can do. The peripheral wiring is located closer to the input operation surface than the light-shielding printed layer, but the peripheral wiring can be composed of a highly transparent translucent conductive film, like the input position detection electrode. The presence of wiring is not noticeable.

  In the present invention, the input position detection electrode and the peripheral wiring can adopt a configuration formed on the first surface side of the cover glass. In this case, the mounting conductive film and the wiring are A configuration in which the cover glass is electrically connected via the side end face is adopted.

  In this case, the cover glass is preferably chamfered at a corner portion where the first surface and the side end surface are connected and a corner portion where the second surface and the side end surface are connected. If comprised in this way, while the disconnection by the side end surface of a cover glass can be prevented, the part protruded to the side by chamfering can be utilized as a formation area of the electrically conductive film for mounting.

  In the present invention, the input position detection electrode and the peripheral wiring may be configured to be formed on the second surface side of the cover glass.

  In this case, the peripheral wiring extends to the side end face side of the cover glass through the lower layer side of the light shielding print layer, and the mounting conductive film is located on the side end face side of the light shielding print layer. A configuration in which the peripheral wiring is electrically connected can be employed.

  In this case, the cover glass is preferably chamfered at a corner where the second surface and the side end surface are connected. If comprised in this way, the part protruded to the side by chamfering can be utilized as a formation area | region of the electrically conductive film for mounting.

  In the present invention, a contact hole that penetrates the light-shielding print layer is formed in the light-shielding print layer, and the peripheral wiring passes through the lower layer side of the light-shielding print layer from the input position detection electrode. The mounting conductive film may extend to a position overlapping with the contact hole, and the mounting conductive film may be a light-shielding conductive material filled in the contact hole from the upper side of the light-shielding printed layer.

  In the present invention, the cover glass is preferably made of tempered glass. According to such a configuration, since the cover glass can be thinned, the touch panel can be thinned and lightened.

It is explanatory drawing of the electro-optical apparatus with an input function provided with the touchscreen which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the plane structure of the principal part of the touchscreen which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the cross-sectional structure etc. of the principal part of the touchscreen which concerns on Embodiment 1 of this invention. It is process sectional drawing which shows the manufacturing method of the touchscreen which concerns on Embodiment 1 of this invention. It is explanatory drawing of the electro-optical apparatus with an input function provided with the touchscreen which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows the planar structure of the principal part of the touchscreen which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows the cross-sectional structure etc. of the principal part of the touchscreen which concerns on Embodiment 2 of this invention. It is process sectional drawing which shows the manufacturing method of the touchscreen which concerns on Embodiment 2 of this invention. It is explanatory drawing of the electro-optical apparatus with an input function provided with the touchscreen which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows the planar structure of the principal part of the touchscreen which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows the cross-sectional structure etc. of the principal part of the touchscreen which concerns on Embodiment 3 of this invention. It is process sectional drawing which shows the manufacturing method of the touchscreen which concerns on Embodiment 3 of this invention. It is explanatory drawing of the electronic device provided with the electro-optical apparatus with an input function to which this invention is applied.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings to be referred to in the following description, the scales are different for each layer and each member so that each layer and each member have a size that can be recognized on the drawing. Further, in the drawings referred to in the following description, the input operation surface side is shown upward, but when explaining the mutual positional relationship of a plurality of layers formed on the cover glass, the side closer to the cover glass (front The side formed in the above step) is defined as the “lower layer side”, and the side far from the cover glass (the side formed in the subsequent step) is defined as the “upper layer side”.

[Embodiment 1]
(Overall configuration of electro-optical device with input function)
1A and 1B are explanatory diagrams of an electro-optical device with an input function including a touch panel according to Embodiment 1 of the present invention, and FIGS. 1A and 1B are perspective views of the electro-optical device with an input function. And FIG.

  1A and 1B, an electro-optical device 100 with an input function according to the present embodiment is generally an image generation device 5 composed of a liquid crystal device or the like, and a surface on the side from which display light is emitted in the image generation device 5. The image forming device 5 and the touch panel 1 are bonded to each other by an adhesive layer 85 or the like. The image generating apparatus 5 includes a liquid crystal panel as an electro-optical panel 5a (display panel). In this embodiment, both the touch panel 1 and the electro-optical panel 5a have a rectangular planar shape, and the central area when the touch panel 1 and the electro-optical device 100 with an input function are viewed in plan is the input area 2a. Further, in the image generating device 5 and the electro-optical device 100 with an input function, an area that overlaps the input area 2a in plan view is an image forming area. In the touch panel 1, a mounting region 240 is provided on a side where the side end surface 90 e is located among the side end surfaces 90 e to 90 h of the cover glass 90 used for the touch panel 1, and an end portion of the flexible wiring board 35 is provided in the mounting region 240. Is connected. Further, the end of the flexible wiring board 73 is connected to the side where the side end face 90e of the touch panel 1 is located in the electro-optical panel 5a.

  The image generation device 5 is a transmissive or transflective active matrix liquid crystal display device, and is opposite to the side on which the touch panel 1 is disposed with respect to the electro-optical panel 5a (display light emission side and Is provided with a backlight device (not shown). The backlight device includes, for example, a translucent light guide plate that is placed on the side opposite to the side where the touch panel 1 is placed with respect to the electro-optical panel 5a, and a white color toward the side end of the light guide plate. A light source such as a light emitting diode that emits light, etc., and the light emitted from the light source is incident on the side edge of the light guide plate and then emitted toward the electro-optical panel 5a while propagating through the light guide plate. Is done. A sheet-like optical member such as a light scattering sheet or a prism sheet may be disposed between the light guide plate and the electro-optical panel 5a.

  In the image generating apparatus 5, a first polarizing plate 81 is placed on the electroluminescent panel 5a on the display light emission side, and a second polarizing plate 82 is placed on the opposite side. The electro-optical panel 5a includes a light-transmitting element substrate 50 disposed on the side opposite to the display light emission side, and a light-transmitting counter element disposed opposite to the element substrate 50 on the display light emission side. And a substrate 60. The counter substrate 60 and the element substrate 50 are bonded to each other with a rectangular frame-shaped sealing material 71, and the liquid crystal layer 55 is held in a region surrounded by the sealing material 71 between the counter substrate 60 and the element substrate 50. ing. In the element substrate 50, a plurality of pixel electrodes 58 are formed on a surface facing the counter substrate 60 by a translucent conductive film such as an ITO (Indium Tin Oxide) film or an IZO (Indium Zinc Oxide) film. A common electrode 68 is formed of a light-transmitting conductive film such as an ITO film on the surface facing the element substrate 50. Further, a color filter is formed on the counter substrate 60. When the image generation apparatus 5 is an IPS (In Plane Switching) method or an FFS (Fringe Field Switching) method, the common electrode 68 is provided on the element substrate 50 side. Further, the element substrate 50 may be arranged on the display light emitting side with respect to the counter substrate 60. In the element substrate 50, a driving IC 75 is COG-mounted in an overhang region 59 projecting from the edge of the counter substrate 60, and a flexible wiring board 73 is connected to the overhang region 59. Note that a drive circuit may be formed on the element substrate 50 simultaneously with the switching elements on the element substrate 50.

(Schematic configuration of the touch panel 1)
The touch panel 1 includes a cover glass 90 on the input operation surface side. In this embodiment, the cover glass 90 is made of chemically strengthened glass. Such chemically tempered glass is glass that has been subjected to chemical tempering treatment by immersing it in a potassium salt molten bath at a temperature of about 400 ° C., and sodium ions of the glass substrate are ion-exchanged with potassium ions. Here, the ionic radius of sodium is 95 nm, whereas the ionic radius of potassium ions is 133 nm. The ionic radius of potassium ions is larger than that of sodium ions. For this reason, the glass substrate is in a state where the strength is enhanced by the compressive stress resulting from the chemical strengthening layer on the surface. Therefore, the cover glass 90 of this embodiment has a very thin thickness of about 0.2 mm.

  As shown in FIG. 1B, the first light-transmitting conductive film is formed on the side of the first surface 90 a on the input operation surface side in the cover glass 90, as will be described in detail later, from the lower layer side to the upper layer side. 4a, the interlayer insulation film 23, the 2nd translucent conductive film 4b, and the topcoat layer 96 are formed in this order. In the cover glass 90, a light-shielding print layer 94 is formed on the second surface 90b opposite to the first surface 90a, and an area surrounded by the light-shielding print layer 94 is the input area 2a. In this embodiment, the light-shielding print layer 94 is not limited in color as long as it has light-shielding properties, but the light-shielding print layer 94 used in this embodiment is a black print layer.

  In the touch panel 1 configured as described above, the input position detecting electrode 21 in the input region 2a by the first translucent conductive film 4a out of the first translucent conductive film 4a and the second translucent conductive film 4b, In the peripheral region 2b, peripheral wiring 27 extending from the input region 2a toward the side end surface 90e of the cover glass 90 is formed. Of the side end faces 90e, 90f, 90g, 90h of the cover glass 90, the flexible wiring board 35 is connected to the second face 90b side at the side end face 90e, and the flexible wiring board 35 will be described later. Are electrically connected to the peripheral wiring 27.

  Between the touch panel 1 and the electro-optical panel 5a, a conductive film for shielding in which a light-transmitting conductive film such as an ITO film is formed on the light-transmitting film may be disposed. It has the function of preventing the potential change on the image generating device 5 side from affecting the input position detecting electrode 21 as noise. Note that the conductive film may be omitted when a sufficient distance can be secured between the image generation device 5 and the input position detection electrode 21.

(Plane configuration of the touch panel 1)
FIG. 2 is an explanatory diagram showing a planar configuration of the main part of the touch panel 1 according to Embodiment 1 of the present invention. FIGS. 2 (a) and 2 (b) are light-shielding printed layers 94 formed on the cover glass 90. FIG. 2 is an explanatory diagram showing a planar configuration such as the above, and an explanatory diagram showing a planar configuration of the position detection electrode 21 and the like formed on the cover glass. In FIG. 2B, the corner of the input area 2a is indicated by an English letter “L” mark.

  As shown in FIGS. 2A and 2B, in the touch panel 1 of the present embodiment, the input extending on the first surface 90a side of the cover glass 90 in the X direction (first direction) in the input region 2a. A plurality of first electrodes 211 for position detection, and a plurality of second electrodes 212 for input position detection extending in the Y direction (second direction) intersecting the X direction in the input region 2a, These first electrode 211 and second electrode 212 form an input position detection electrode 21. Further, in the first surface 90 a of the cover glass 90, the peripheral region 2 b includes the peripheral wiring 27 extending from one end portion of the first electrode 211 and the peripheral portion extending from one end portion of the second electrode 212. Wiring 27 is formed, and all the peripheral wiring 27 extends toward the side end face 90e.

(Cross-sectional configuration of the touch panel 1)
FIG. 3 is an explanatory diagram illustrating a cross-sectional configuration of a main part of the touch panel 1 according to Embodiment 1 of the present invention. FIGS. 3 (a), 3 (b), and 3 (c) illustrate the touch panel 1 in FIG. Sectional drawing cut | disconnected along the C1-C1 'line of b), sectional drawing which cut | disconnected the touch panel 1 along the D1-D1' line of FIG.2 (b), and the structure of the side end surface 90e of the cover glass 90 are shown. It is a side view.

  As shown in FIGS. 2 (a), 2 (b) and FIGS. 3 (a), 3 (b), in the touch panel 1 of this embodiment, the first surface 90a side of the cover glass 90 is arranged from the lower layer side to the upper layer side. A top coat layer 96 made of the first translucent conductive film 4a, the translucent interlayer insulating film 23, the second translucent conductive film 4b, and the translucent photosensitive resin is formed in this order. ing.

  The first translucent conductive film 4a is made of a polycrystalline ITO film, and an interlayer insulation made of a translucent insulating film such as a photosensitive resin film or a silicon oxide film is formed on the upper side of the first translucent conductive film 4a. A film 23 is formed. In the present embodiment, the second translucent conductive film 4b is also made of a polycrystalline ITO film, like the first translucent conductive film 4a.

  The first translucent conductive film 4a is first formed as a plurality of rhombus regions in the input region 2a, and the rhombus regions are pad portions 211a of the input position detection electrodes 21 (first electrode 211 and second electrode 212). , 212a (large area portion). These pad portions 211a and 212a are alternately arranged in the X direction and the Y direction. In the plurality of pad portions 211a, adjacent pad portions 211a in the X direction (first direction) are connected via a connecting portion 211c, and the pad portion 211a and the connecting portion 211c extend in the X direction. Is configured. On the other hand, the plurality of pad portions 212a constitute the second electrode 212 extending in the Y direction (second direction), but overlap between the pad portions 212a adjacent in the Y direction, that is, the connecting portion 211c. The portion is a discontinuous portion 218a.

  The interlayer insulating film 23 is formed over the entire input region 2a. A contact hole 23a is formed in the interlayer insulating film 23, and the contact hole 23a is formed at a position overlapping the end portion facing the gap portion 218a in the pad portion 212a. On the upper layer side of the interlayer insulating film 23, the second translucent conductive film 4b is formed as a relay electrode 215 in a region overlapping the contact hole 23a.

  In the touch panel 1 configured as described above, the first electrode 211 and the second electrode 212 are formed of the same conductive film (first translucent conductive film 4a) and extend in directions intersecting each other. Therefore, an intersection 218 where the first electrode 211 and the second electrode 212 intersect exists on the cover glass 90. Here, of the first electrode 211 and the second electrode 212, the first electrode 211 extends in the X direction by the connecting portion 211c made of the second light-transmissive conductive film 4b even at the intersection 218. On the other hand, the second electrode 212 has a discontinuous portion 218 a at the intersection 218. However, at the intersection 218, a relay electrode 215 is formed above the interlayer insulating film 23, and the relay electrode 215 is adjacent to the pad adjacent to the interrupted portion 218a via the contact hole 23a of the interlayer insulating film 23. 212a is electrically connected. For this reason, the second electrode 212 extends in the Y direction while being electrically connected in the Y direction. The relay electrode 215 overlaps the connecting portion 211c with the interlayer insulating film 23 interposed therebetween, so there is no possibility of short circuit.

  In this embodiment, the peripheral wiring 27 is formed by the first light-transmitting conductive film 4a on the first surface 90b side of the cover glass 90, and the input position detection electrode 21 (the first electrode 211 and the second electrode). 212) and the peripheral wiring 27 are electrically connected in a one-to-one relationship. Here, the peripheral wiring 27 is made of the first translucent conductive film 4a, like the input position detecting electrode 21. For this reason, the peripheral wiring 27 cannot be seen from the input operation surface side (the first surface 90a side).

  In this embodiment, a top coat layer 96 made of a photosensitive resin or the like is formed on the upper surface side of the second translucent conductive film 4b on the first surface 90a side of the cover glass 90, and the top coat layer 96 is formed. Is formed in the entire input area 2a.

(Mounting structure of light-shielding printed layer 94 and flexible wiring board 35)
In this embodiment, a light-shielding printing layer 94 is formed in the peripheral region 2b on the second surface 90b side of the cover glass 90, and the thickness of the light-shielding printing layer 94 is, for example, 30 μm to 50 μm. . In this embodiment, a mounting area 240 for the flexible wiring board 35 is provided on the light-shielding print layer 94. For this reason, the flexible wiring board 35 is connected to the second surface 90 b of the cover glass 90. However, in this embodiment, since the following configuration is adopted, the peripheral wiring 27 and the flexible wiring board 35 formed on the first surface 90a of the cover glass 90 are electrically connected.

  First, as shown in FIGS. 3B and 3C, in the touch panel 1 of this embodiment, a plurality of side end surface wirings 28 made of a polycrystalline ITO film or the like are formed on the side end surface 90e of the cover glass 90. The side end face wiring 28 is electrically connected to the peripheral wiring 27 on a one-to-one basis.

  A plurality of mounting conductive films 24 are formed on the light-shielding printed layer 94 on the second surface 90 b side of the cover glass 90. The mounting conductive film 24 extends from the light-shielding printed layer 94 to the side end face 90 e and overlaps the end of the side end face wiring 28. For this reason, the mounting conductive film 24 is electrically connected to the side end face wiring 28 on a one-to-one basis, and as a result, is electrically connected to the peripheral wiring 27 on a one-to-one basis. Thus, in this embodiment, the mounting region 240 is formed on the light-shielding print layer 94 by the mounting conductive film 24 on the second surface 90b side, and the flexible wiring board 35 is connected to the mounting region 240. . Here, the flexible wiring board 35 has a structure in which a conductive layer 351 is formed on an insulating base film 350, and the conductive layer 351 and the mounting conductive film 24 are electrically connected. For this reason, the flexible wiring substrate 35 is electrically connected to the peripheral wiring 27 formed on the first surface 90 a of the cover glass 90 via the mounting conductive film 24 and the side end surface wiring 28. In this embodiment, the mounting conductive film 24 is made of a polycrystalline or amorphous ITO film 24a.

  Here, the cover glass 90 has a chamfered corner portion where the side end surface 90e and the first surface 90a are connected, and a corner portion where the side end surface 90e and the second surface 90b are connected, and the side end surface 90e is It consists of a slope 90s on the first surface 90a side, an orthogonal surface 90u orthogonal to the first surface 90a, and a slope 90t on the second surface 90b side. In this embodiment, the peripheral wiring 27 is formed on the first surface 90a and the inclined surface 90s, and the side end surface wiring 28 is formed on the entire side end surface 90e (the inclined surface 90s, the orthogonal surface 90u, and the inclined surface 90t). The mounting conductive film 24 is formed on the light-shielding printed layer 94 and on the inclined surface 90t.

(Input position detection method)
In the touch panel 1 configured as described above, when a position detection signal in the form of a rectangular pulse is output to the input position detection electrode 21, if no capacitance is parasitic on the input position detection electrode 21, it is applied to the input position detection electrode 21. A signal having the same waveform as the detected position detection signal is detected. On the other hand, if a capacitance is parasitic on the input position detection electrode 21, a waveform distortion due to the capacitance occurs. Therefore, it is detected whether or not the capacitance is parasitic on the input position detection electrode 21. be able to. Accordingly, when the finger approaches one of the plurality of input position detection electrodes 21 on the first surface 90a side (the input operation surface side) of the cover glass 90, the input position detection electrode 21 that the finger has approached. Then, since the electrostatic capacitance increases by the electrostatic capacitance generated between the finger and the electrode, the electrode close to the finger can be specified.

(Method for manufacturing touch panel 1)
FIG. 4 is a process cross-sectional view illustrating the manufacturing method of the touch panel 1 according to Embodiment 1 of the present invention. Note that FIG. 4 corresponds to the cross section at the position represented by the cross section in FIG.

  In manufacturing the touch panel 1 of this embodiment, a cover glass 90 made of chemically strengthened glass is prepared as shown in FIG. In this embodiment, the cover glass 90 is a chemically strengthened glass obtained by cutting a large glass substrate into the size of the cover glass 90, chamfering the side end surface 90e, and then performing a chemical strengthening process.

  Next, a film forming process, a patterning process, and the like are repeatedly performed on the first surface 90 side of the cover glass 90, so that the first light-transmitting conductive film 4a, the interlayer insulating film 23, and the second light-transmitting conductive film 4b are formed. Form.

  More specifically, in the first translucent conductive film forming step, the ITO film forming step and the patterning step are performed on the first surface 90a side of the cover glass 90, and the input position detecting electrode 21 and the periphery A first translucent conductive film 4a constituting the wiring 27 is formed. Next, as shown in FIG. 4B, the orientation of the cover glass 90 is changed and the ITO film forming process and the patterning process are performed on the side end face 90e to form the side end face wiring 28. Next, as shown in FIG. A lift-off method may be used to form the side end surface wiring 28. In addition, after the ITO film forming step is continuously performed on the first surface 90a and the side end surface 90e of the cover glass 90, the patterning step is simultaneously performed on the ITO film formed on the first surface 90a and the side end surface 90e. May be.

  Next, as shown in FIG. 4C, the interlayer insulating film 23 provided with the contact hole 23a described with reference to FIG. 3 is formed. Here, when the interlayer insulating film 23 is formed of a silicon oxide film, a silicon oxide film forming process and a patterning process are performed. When the interlayer insulating film 23 is formed of a photosensitive resin, A coating process, an exposure / development process are performed. Note that the interlayer insulating film 23 is formed over substantially the entire input region 2a and is not formed in the peripheral region 2b. Next, in the second translucent conductive film forming process, the ITO film forming process and the patterning process are performed to form the second translucent conductive film 4b constituting the relay electrode 215 described with reference to FIG. To do. Next, in the top coat layer forming step, a resin coating step and a solidifying step are performed on the second surface 90 b side of the cover glass 90 to form the top coat layer 96.

  Next, in the light shielding printing process shown in FIG. 4D, the light shielding printing layer 94 is formed on the peripheral region 2b on the second surface 90b side of the cover glass 90.

  Next, in the mounting conductive film forming step shown in FIG. 4E, on the second surface 90b side of the cover glass 90, a plurality of mounting conductive films made of a conductive film such as an ITO film 24a on the light-shielding printed layer 94. A film 24 is formed. At that time, the mounting conductive film 24 extends from the light-shielding printed layer 94 to the side end face 90 e and is overlaid on the end of the side end face wiring 28. In this way, the mounting area 240 is formed on the light-shielding print layer 94.

  After that, as shown in FIG. 3B, the flexible wiring board 35 is electrically connected to the mounting region 240 on the light-shielding printed layer 94 through solder, anisotropic conductive film, conductive paste, or the like. (Flexible wiring board connection step).

(Main effects of this form)
As described above, in the touch panel 1 and the manufacturing method thereof according to the present embodiment, the input position detecting electrode 21 and the peripheral wiring 27 are formed on the cover glass 90 itself, and the input position is formed on the glass substrate separate from the cover glass 90. It does not have a structure in which the detection electrode 21 and the peripheral wiring 27 are formed. For this reason, the number of parts can be reduced as much as the glass substrate is omitted, and the touch panel 1 can be made thinner and lighter.

  Further, since the light-shielding printed layer 94 is formed on the second surface 90b side of the cover glass 90, the light-shielding printed layer 94 looks as a smooth surface when viewed from the input operation surface side, and has a good appearance.

  In addition, the flexible wiring board 35 is connected to the second surface 90 b side of the cover glass 90, and the flexible wiring board 35 is mounted on the light-shielding print layer 94. For this reason, since the light-shielding printed layer 94 exists on the input operation surface side with respect to the flexible wiring substrate 35, the flexible wiring substrate 35 cannot be seen from the input operation surface side (first surface side) of the cover glass 90. Further, since the mounting conductive film 24 that is electrically connected to the peripheral wiring 27 formed on the first surface 90 a side of the cover glass 90 is formed on the light-shielding print layer 94, the light-shielding print layer 94. Even when the flexible wiring board 35 is mounted thereon, the flexible wiring board 35 and the peripheral wiring 27 can be electrically connected.

  Furthermore, the peripheral wiring 27 and the mounting conductive film 24 are separate, and after the peripheral wiring 27 is formed, the light-shielding printed layer 94 is formed, and then the mounting conductive film 24 is formed. Yes. For this reason, since the 1st translucent conductive film 4a can be formed before forming the light-shielding printing layer 94 on the cover glass 90, the 1st translucent conductive film 4a is the light-shielding printing layer 94. Not affected by outgas generated from Accordingly, since the first transparent conductive film 4a having a high transparency with a transmittance of 92% or more can be formed, the presence of the input position detection electrode 21 is not noticeable, and an image is transmitted through the touch panel 1. When displaying, a high-quality image can be displayed. The peripheral wiring 27 is located on the input operation surface side of the light-shielding print layer 94, but the peripheral wiring 27 is configured by the first transparent conductive film 4a having high transparency like the input position detection electrode 21. Therefore, the presence of the peripheral wiring 27 is not conspicuous.

  Further, the cover glass 90 is chamfered at a corner portion where the first surface 90a and the side end surface 90e are connected and a corner portion where the second surface 90b and the side end surface 90e are connected. For this reason, disconnection of the peripheral wiring 27, the side end surface wiring 28, and the mounting conductive film 24 at the side end surface 90e of the cover glass 90 can be prevented. Further, a portion protruding sideways by chamfering on the side end face 90e can be used as a formation region of the mounting conductive film 24, and a connection area between the side end face wiring 28 and the mounting conductive film 24 can be widened. . In this embodiment, the cover glass 90 has a chamfered corner portion where the first surface 90a and the side end surface 90e are connected and a corner portion where the second surface 90b and the side end surface 90e are connected. May be.

  In this embodiment, since the cover glass 90 is tempered glass, the cover glass 90 can be thinned to about 0.2 m. Therefore, the touch panel 1 can be reduced in thickness and weight.

[Embodiment 2]
(Overall configuration of touch panel 1)
FIGS. 5A and 5B are explanatory diagrams of an electro-optical device with an input function including a touch panel according to Embodiment 2 of the present invention. FIGS. 5A and 5B are perspective views of the electro-optical device with an input function. And FIG. 6A and 6B are explanatory views showing a planar configuration of a main part of the touch panel 1 according to Embodiment 2 of the present invention. FIGS. 6A and 6B are light-shielding print layers 94 formed on the cover glass 90. FIG. FIG. 2 is an explanatory diagram showing a planar configuration such as the above, and an explanatory diagram showing a planar configuration of the position detection electrode 21 and the like formed on the cover glass. In FIG. 6B, the position of the corner of the input area 2a is indicated by an English letter “L”. FIG. 7 is an explanatory diagram showing a cross-sectional configuration and the like of the main part of the touch panel 1 according to Embodiment 2 of the present invention. FIGS. 7 (a), 7 (b), and 7 (c) show the touch panel 1 in FIG. Sectional drawing cut | disconnected along the C2-C2 'line of b), sectional drawing which cut | disconnected the touch panel 1 along the D2-D2' line of FIG.6 (b), and the structure of the side end surface 90e of the cover glass 90 are shown. It is a side view. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 5A and 5B, the electro-optical device 100 with an input function according to the present embodiment is also similar to the first embodiment in that the image generating device 5 is generally composed of a liquid crystal device and the like, and 5 has a capacitance-type touch panel 1 that is disposed so as to overlap the surface on the display light emitting side. In the touch panel 1, a mounting region 240 is provided on the side where the side end surface 90 e of the cover glass 90 used in the touch panel 1 is located, and the end of the flexible wiring board 35 is connected to the mounting region 240. In the touch panel 1, the cover glass 90 is made of chemically strengthened glass having a thickness of about 0.2 mm.

  As shown in FIG. 5 (b), in the present embodiment, unlike the first embodiment, the second surface 90b on the side opposite to the first surface 90a on the input operation surface side is changed from the lower layer side to the upper layer side. The first light-transmitting conductive film 4a, the interlayer insulating film 23, the second light-transmitting conductive film 4b, and the top coat layer 96 are formed in this order. In the cover glass 90, a light-shielding print layer 94 is formed on the second surface 90b, and an area surrounded by the light-shielding print layer 94 is the input area 2a. In this embodiment, the light-shielding print layer 94 is not limited in color as long as it has light-shielding properties, but the light-shielding print layer 94 used in this embodiment is a black print layer.

  As shown in FIGS. 6A, 6 </ b> B, and 7 </ b> A, in the touch panel 1 of the present embodiment, input is performed on the second surface 90 b side of the cover glass 90 by the first translucent conductive film 4 a. A position detection electrode 21 is formed. Further, on the second surface 90 b of the cover glass 90, the peripheral region 2 b includes the peripheral wiring 27 extending from one end of the first electrode 211 and the peripheral extending from one end of the second electrode 212. Wiring 27 is formed, and all the peripheral wiring 27 extends toward the side end face 90e. Here, the peripheral wiring 27 is made of the first translucent conductive film 4a, like the input position detecting electrode 21. For this reason, the peripheral wiring 27 cannot be seen from the input operation surface side (the first surface 90a side).

(Mounting structure of light-shielding printed layer 94 and flexible wiring board 35)
In the present embodiment, as in the first embodiment, a light-shielding print layer 94 is formed in the peripheral region 2b on the second surface 90b side of the cover glass 90, and the thickness of the light-shielding print layer 94 is as follows. For example, it is 30 micrometers-50 micrometers. Here, the light-shielding printed layer 94 is formed on the upper layer side of the peripheral wiring 27, and the mounting area 240 of the flexible wiring board 35 is provided on the light-shielding printed layer 94. For this reason, the flexible wiring board 35 is connected to the second surface 90 b of the cover glass 90. However, in this embodiment, since the following configuration is adopted, the peripheral wiring 27 formed on the lower layer side of the light-shielding print layer 94 on the second surface 90b of the cover glass 90 and the light-shielding print layer 94 are arranged. The flexible wiring board 35 formed on the upper layer side is electrically connected.

  First, as shown in FIG. 7B, in the touch panel 1 of the present embodiment, the light-shielding print layer 94 is formed slightly inside the side end surface 90e of the cover glass 90, whereas the peripheral wiring 27 is The light reaches the side end face 90e of the cover glass 90 through the lower layer side of the light-shielding print layer 94. For this reason, the end of the peripheral wiring 27 protrudes toward the side end face 90 e of the cover glass 90 from the light-shielding print layer 94.

  Also, as shown in FIGS. 7B and 7C, a plurality of mounting conductive films 24 are formed on the light-shielding printed layer 94 on the second surface 90 b side of the cover glass 90. The mounting conductive film 24 extends from the light-shielding printed layer 94 to the side end face 90 e and overlaps the end of the peripheral wiring 27. For this reason, the mounting conductive film 24 is electrically connected to the peripheral wiring 27 on a one-to-one basis. Thus, in this embodiment, the mounting region 240 is formed on the light-shielding print layer 94 by the mounting conductive film 24 on the second surface 90b side, and the flexible wiring board 35 is connected to the mounting region 240. . For this reason, the flexible wiring board 35 is electrically connected to the peripheral wiring 27 formed on the lower layer side of the light-shielding printed layer 94 through the mounting conductive film 24. In this embodiment, the mounting conductive film 24 is made of a polycrystalline or amorphous ITO film 24a.

  Here, the cover glass 90 has a chamfered corner portion where the side end surface 90e and the first surface 90a are connected, and a corner portion where the side end surface 90e and the second surface 90b are connected, and the side end surface 90e is It consists of a slope 90s on the first surface 90a side, an orthogonal surface 90u orthogonal to the first surface 90a, and a slope 90t on the second surface 90b side. In this embodiment, the peripheral wiring 27 is formed from the second surface 90b to the inclined surface 90t, and the mounting conductive film 24 is formed on the light-shielding printed layer 94 and on the inclined surface 90t.

(Method for manufacturing touch panel 1)
FIG. 8 is a process cross-sectional view illustrating the manufacturing method of the touch panel 1 according to Embodiment 2 of the present invention. Note that FIG. 8 corresponds to the cross section at the position represented by the cross section in FIG.

  In manufacturing the touch panel 1 of this embodiment, a cover glass 90 made of chemically strengthened glass is prepared as shown in FIG. In this embodiment, the cover glass 90 is a chemically strengthened glass obtained by cutting a large glass substrate into the size of the cover glass 90, chamfering the side end surface 90e, and then performing a chemical strengthening process.

  Next, a film forming process, a patterning process, and the like are repeatedly performed on the second surface 90b side of the cover glass 90, so that the first light-transmitting conductive film 4a, the interlayer insulating film 23, and the second light-transmitting conductive film 4b are formed. Form.

  More specifically, in the first translucent conductive film forming step, an ITO film forming step and a patterning step are performed on the second surface 90b side of the cover glass 90, and the input position detecting electrode 21 and the periphery A first translucent conductive film 4a constituting the wiring 27 is formed.

  Next, as shown in FIG. 8B, the interlayer insulating film 23 provided with the contact hole 23a shown in FIG. 7A is formed. Here, when the interlayer insulating film 23 is formed of a silicon oxide film, a silicon oxide film forming process and a patterning process are performed. When the interlayer insulating film 23 is formed of a photosensitive resin, A coating process, an exposure / development process are performed. Note that the interlayer insulating film 23 is formed over substantially the entire input region 2a and is not formed in the peripheral region 2b. Next, in the second translucent conductive film forming process, the ITO film forming process and the patterning process are performed to form the second translucent conductive film 4b constituting the relay electrode 215 shown in FIG. . Next, in the top coat layer forming step, a resin coating step and a solidifying step are performed on the second surface 90 b side of the cover glass 90 to form the top coat layer 96.

  Next, in the light shielding printing process shown in FIG. 8C, the light shielding printing layer 94 is formed on the peripheral region 2b on the second surface 90b side of the cover glass 90.

  Next, in the mounting conductive film forming step shown in FIG. 8D, a plurality of mounting conductive films made of a conductive film such as an ITO film 24a on the light-shielding printed layer 94 on the second surface 90b side of the cover glass 90. A film 24 is formed. At that time, the mounting conductive film 24 extends from the light-shielding printed layer 94 to the side end face 90 e and is overlaid on the end of the peripheral wiring 27. In this way, the mounting area 240 is formed on the light-shielding print layer 94.

  After that, as shown in FIG. 7B, the flexible wiring board 35 is electrically connected to the mounting region 240 on the light-shielding printed layer 94 through solder, anisotropic conductive film, conductive paste, or the like. (Flexible wiring board connection step).

(Main effects of this form)
As described above, also in the touch panel 1 and the manufacturing method thereof according to the present embodiment, the input position detection electrode 21 and the peripheral wiring 27 are formed on the cover glass 90 itself as in the first embodiment, It does not have a structure in which the input position detecting electrode 21 and the peripheral wiring 27 are formed on the body glass substrate. For this reason, the number of parts can be reduced as much as the glass substrate is omitted, and the touch panel 1 can be made thinner and lighter. Further, since the light-shielding printed layer 94 is formed on the second surface 90b side of the cover glass 90, the light-shielding printed layer 94 looks as a smooth surface when viewed from the input operation surface side, and has a good appearance.

  In addition, the flexible wiring board 35 is connected to the second surface 90 b side of the cover glass 90, and the flexible wiring board 35 is mounted on the light-shielding print layer 94. For this reason, since the light-shielding printed layer 94 exists on the input operation surface side with respect to the flexible wiring substrate 35, the flexible wiring substrate 35 cannot be seen from the input operation surface side (first surface side) of the cover glass 90. Further, since the mounting conductive film 24 electrically connected to the peripheral wiring 27 formed on the lower layer side of the light-shielding print layer 94 is formed on the light-shielding print layer 94. Even when the flexible wiring board 35 is mounted on the flexible wiring board 35, the flexible wiring board 35 and the peripheral wiring 27 can be electrically connected.

  Furthermore, the peripheral wiring 27 and the mounting conductive film 24 are separate, and after the peripheral wiring 27 is formed, the light-shielding printed layer 94 is formed, and then the mounting conductive film 24 is formed. Yes. For this reason, since the 1st translucent conductive film 4a can be formed before forming the light-shielding printing layer 94 on the cover glass 90, the 1st translucent conductive film 4a is the light-shielding printing layer 94. Not affected by outgas generated from Accordingly, since the first transparent conductive film 4a having high transparency can be formed, the presence of the input position detection electrode 21 is not noticeable, and when the image is displayed through the touch panel 1, the quality is high. An image can be displayed. The peripheral wiring 27 is located on the input operation surface side of the light-shielding print layer 94, but the peripheral wiring 27 is configured by the first transparent conductive film 4a having high transparency like the input position detection electrode 21. Therefore, the presence of the peripheral wiring 27 is not conspicuous.

  In addition, the cover glass 90 is chamfered at the corner portion where the first surface 90a and the side end surface 90e are connected, and the corner portion where the second surface 90b and the side end surface 90e are connected, so that the side end surface 90e is chamfered. The portion protruding to the side can be used as a region for forming the mounting conductive film 24, and the connection area between the peripheral wiring 27 and the mounting conductive film 24 can be widened. In this embodiment, the cover glass 90 has a chamfered corner portion where the first surface 90a and the side end surface 90e are connected and a corner portion where the second surface 90b and the side end surface 90e are connected. May be.

  In this embodiment, since the cover glass 90 is tempered glass, the cover glass 90 can be thinned to about 0.2 m. Therefore, the touch panel 1 can be reduced in thickness and weight.

[Embodiment 3]
(Overall configuration of touch panel 1)
9 is an explanatory diagram of an electro-optical device with an input function including a touch panel according to Embodiment 3 of the present invention. FIGS. 9A and 9B are perspective views of the electro-optical device with an input function. And FIG. 10A and 10B are explanatory views showing a planar configuration of the main part of the touch panel 1 according to Embodiment 3 of the present invention. FIGS. 10A and 10B are light-shielding print layers 94 formed on the cover glass 90. FIG. 2 is an explanatory diagram showing a planar configuration such as the above, and an explanatory diagram showing a planar configuration of the position detection electrode 21 and the like formed on the cover glass. In FIG. 10B, the corner of the input area 2a is indicated by a letter “L” in English. FIG. 11 is an explanatory diagram showing a cross-sectional configuration and the like of the main part of the touch panel 1 according to Embodiment 3 of the present invention. FIGS. b) A cross-sectional view taken along the line C3-C3 ', a cross-sectional view taken along the line D3-D3' of FIG. 10B, and a position where the cover glass 90 passes through the mounting conductive film. It is explanatory drawing which shows a mode that it cut | disconnected by. Since the basic configuration of this embodiment is the same as that of Embodiments 1 and 2, common portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 9A and 9B, the electro-optical device 100 with an input function according to the present embodiment is also similar to the first and second embodiments in that the image generating device 5 generally composed of a liquid crystal device or the like and The generating device 5 includes a capacitive touch panel 1 that is disposed so as to overlap the surface on the display light emitting side. In the touch panel 1, a mounting region 240 is provided on the side where the side end surface 90 e of the cover glass 90 used in the touch panel 1 is located, and the end of the flexible wiring board 35 is connected to the mounting region 240. In the touch panel 1, the cover glass 90 is made of chemically strengthened glass having a thickness of about 0.2 mm.

  As shown in FIG. 9 (b), in this embodiment, as in the first and second embodiments, the second surface 90b opposite to the first surface 90a on the input operation surface side is shifted from the lower layer side to the upper layer side. The first light-transmitting conductive film 4a, the interlayer insulating film 23, the second light-transmitting conductive film 4b, and the top coat layer 96 are formed in this order. In the cover glass 90, a light-shielding print layer 94 is formed on the second surface 90b, and an area surrounded by the light-shielding print layer 94 is the input area 2a. In this embodiment, the light-shielding print layer 94 is not limited in color as long as it has light-shielding properties, but the light-shielding print layer 94 used in this embodiment is a black print layer.

  As shown in FIGS. 10A, 10 </ b> B, and 11 </ b> A, in the touch panel 1 of the present embodiment, the first transparent conductive film 4 a is input on the second surface 90 b side of the cover glass 90. A position detection electrode 21 is formed. Further, on the second surface 90 b of the cover glass 90, the peripheral region 2 b includes the peripheral wiring 27 extending from one end of the first electrode 211 and the peripheral extending from one end of the second electrode 212. Wiring 27 is formed, and all the peripheral wiring 27 extends toward the side end face 90e. Here, the peripheral wiring 27 is made of the first translucent conductive film 4a, like the input position detecting electrode 21. For this reason, the peripheral wiring 27 cannot be seen from the input operation surface side (the first surface 90a side).

(Mounting structure of light-shielding printed layer 94 and flexible wiring board 35)
In the present embodiment, as in the second embodiment, the light shielding printing layer 94 is formed in the peripheral region 2b on the second surface 90b side of the cover glass 90, and the thickness of the light shielding printing layer 94 is as follows. For example, it is 30 micrometers-50 micrometers. Here, the light-shielding printed layer 94 is formed on the upper layer side of the peripheral wiring 27, and the mounting area 240 of the flexible wiring board 35 is provided on the light-shielding printed layer 94. For this reason, the flexible wiring board 35 is connected to the second surface 90 b of the cover glass 90. However, in this embodiment, since the following configuration is adopted, the peripheral wiring 27 formed on the lower layer side of the light-shielding print layer 94 on the second surface 90b of the cover glass 90 and the light-shielding print layer 94 are arranged. The flexible wiring board 35 formed on the upper layer side is electrically connected.

  First, as shown in FIGS. 11B and 11C, in the light-shielding printed layer 94, in the vicinity of the side end surface 90 e of the cover glass 90, the light-shielding printed layer 94 passes through to the upper surface of the peripheral wiring 27. A reaching contact hole 94a is formed. In addition, a plurality of mounting conductive films 24 are formed on the light-shielding printed layer 94 on the second surface 90b side of the cover glass 90, and a part of the mounting conductive films 24 are formed in the contact holes 94a. Filled. For this reason, the mounting conductive film 24 is electrically connected to the peripheral wiring 27 on a one-to-one basis. Thus, in this embodiment, the mounting region 240 is formed on the light-shielding print layer 94 by the mounting conductive film 24 on the second surface 90b side, and the flexible wiring board 35 is connected to the mounting region 240. . For this reason, the flexible wiring board 35 is electrically connected to the peripheral wiring 27 formed on the lower layer side of the light-shielding printed layer 94 through the mounting conductive film 24. In this embodiment, the mounting conductive film 24 is made of a light-shielding conductive material 24b such as a black anisotropic conductive film or black carbon paste.

(Method for manufacturing touch panel 1)
FIG. 12 is a process cross-sectional view illustrating the manufacturing method of the touch panel 1 according to Embodiment 3 of the present invention. Note that FIG. 12 corresponds to the cross section at the position represented by the cross section in FIG.

  In manufacturing the touch panel 1 of this embodiment, a cover glass 90 made of chemically strengthened glass is prepared as shown in FIG. In this embodiment, the cover glass 90 is a chemically strengthened glass that has been subjected to a chemical strengthening treatment after cutting a large glass substrate into the size of the cover glass 90.

  Next, a film forming process, a patterning process, and the like are repeatedly performed on the second surface 90b side of the cover glass 90, so that the first light-transmitting conductive film 4a, the interlayer insulating film 23, and the second light-transmitting conductive film 4b are formed. Form.

  More specifically, in the first translucent conductive film forming step, an ITO film forming step and a patterning step are performed on the second surface 90b side of the cover glass 90, and the input position detecting electrode 21 and the periphery A first translucent conductive film 4a constituting the wiring 27 is formed.

  Next, as shown in FIG. 12B, an interlayer insulating film 23 having contact holes 23a shown in FIG. 11A is formed. Here, when the interlayer insulating film 23 is formed of a silicon oxide film, a silicon oxide film forming process and a patterning process are performed. When the interlayer insulating film 23 is formed of a photosensitive resin, A coating process, an exposure / development process are performed. Note that the interlayer insulating film 23 is formed over substantially the entire input region 2a and is not formed in the peripheral region 2b. Next, in the second translucent conductive film forming process, the ITO film forming process and the patterning process are performed to form the second translucent conductive film 4b constituting the relay electrode 215 shown in FIG. . Next, in the top coat layer forming step, a resin coating step and a solidifying step are performed on the second surface 90 b side of the cover glass 90 to form the top coat layer 96.

  Next, in the light shielding printing process shown in FIG. 12C, the light shielding printing layer 94 is formed on the peripheral region 2b on the second surface 90b side of the cover glass 90. At this time, a contact hole 94 a that penetrates the light shielding print layer 94 and reaches the upper surface of the peripheral wiring 27 is formed in the light shielding print layer 94.

  Next, in the mounting conductive film forming step shown in FIG. 12D, on the second surface 90b side of the cover glass 90, a black anisotropic conductive film, black carbon paste, etc. A plurality of mounting conductive films 24 made of the light-shielding conductive material 24 b are formed by printing or the like, and the mounting region 240 is formed on the light-shielding print layer 94.

  After that, as shown in FIG. 11B, the flexible wiring board 35 is overlaid on the mounting region 240 on the light-shielding print layer 94, and the flexible wiring board 35 and the peripheral wiring are connected via the mounting conductive film 24. Are electrically connected (flexible wiring board connecting step).

(Main effects of this form)
As described above, also in the touch panel 1 and the manufacturing method thereof according to the present embodiment, the input position detection electrode 21 and the peripheral wiring 27 are formed on the cover glass 90 itself as in the first and second embodiments. The input position detection electrode 21 and the peripheral wiring 27 are not formed on a separate glass substrate. For this reason, the number of parts can be reduced as much as the glass substrate is omitted, and the touch panel 1 can be made thinner and lighter. Further, since the light-shielding printed layer 94 is formed on the second surface 90b side of the cover glass 90, the light-shielding printed layer 94 looks as a smooth surface when viewed from the input operation surface side, and has a good appearance.

  In addition, the flexible wiring board 35 is connected to the second surface 90 b side of the cover glass 90, and the flexible wiring board 35 is mounted on the light-shielding print layer 94. For this reason, since the light-shielding printed layer 94 exists on the input operation surface side with respect to the flexible wiring substrate 35, the flexible wiring substrate 35 cannot be seen from the input operation surface side (first surface side) of the cover glass 90. Further, since the mounting conductive film 24 electrically connected to the peripheral wiring 27 formed on the lower layer side of the light-shielding print layer 94 is formed on the light-shielding print layer 94. Even when the flexible wiring board 35 is mounted on the flexible wiring board 35, the flexible wiring board 35 and the peripheral wiring 27 can be electrically connected.

  Furthermore, the peripheral wiring 27 and the mounting conductive film 24 are separate, and after the peripheral wiring 27 is formed, the light-shielding printed layer 94 is formed, and then the mounting conductive film 24 is formed. Yes. For this reason, since the 1st translucent conductive film 4a can be formed before forming the light-shielding printing layer 94 on the cover glass 90, the 1st translucent conductive film 4a is the light-shielding printing layer 94. Not affected by outgas generated from Accordingly, since the first transparent conductive film 4a having high transparency can be formed, the presence of the input position detection electrode 21 is not noticeable, and when the image is displayed through the touch panel 1, the quality is high. An image can be displayed. The peripheral wiring 27 is located on the input operation surface side of the light-shielding print layer 94, but the peripheral wiring 27 is configured by the first transparent conductive film 4a having high transparency like the input position detection electrode 21. Therefore, the presence of the peripheral wiring 27 is not conspicuous.

  In this embodiment, since the cover glass 90 is tempered glass, the cover glass 90 can be thinned to about 0.2 m. Therefore, the touch panel 1 can be reduced in thickness and weight.

[Other embodiments]
In the above embodiment, the input position detection electrode 21 and the peripheral wiring 27 are configured by a common light-transmitting conductive film (first light-transmitting conductive film 4a / ITO). The first light-transmitting conductive film 4a (ITO) may be used, and for the peripheral wiring 27, another light-transmitting conductive film, for example, IZO may be used. The input position detecting electrode 21 is composed of the first translucent conductive film 4a (ITO), and the peripheral wiring 27 is composed of a translucent conductive film made of a multilayer film of IZO / Au (gold) / IZO. Alternatively, a translucent conductive film made of a multilayer film of ITO / Au (gold) / ITO may be used. According to such a multilayer film, the wiring resistance of the peripheral wiring 27 can be reduced.

  In the embodiment described above, the input position detection electrode 21 is formed by the first light-transmissive conductive film 4a, and the relay electrode 215 is formed by the second light-transmissive conductive film 4b. The present invention may be applied to a touch panel in which the relay electrode 215 is formed by the translucent conductive film 4a and the input position detection electrode 21 is formed by the second translucent conductive film 4b.

  In the above embodiment, a liquid crystal device is used as the image generating device 5, but an organic electroluminescence device may be used as the image generating device 5.

[Example of mounting on electronic devices]
An electronic apparatus to which the electro-optical device 100 with an input function according to the above-described embodiment is applied will be described. FIG. 13 is an explanatory diagram of an electronic apparatus including the electro-optical device 100 with an input function to which the present invention is applied. FIG. 13A shows the configuration of a mobile personal computer including the electro-optical device 100 with an input function. The personal computer 2000 includes an electro-optical device 100 with an input function as a display unit and a main body 2010. The main body 2010 is provided with a power switch 2001 and a keyboard 2002. FIG. 13B shows a configuration of a mobile phone including the electro-optical device 100 with an input function. A cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and the electro-optical device 100 with an input function as a display unit. By operating the scroll button 3002, the screen displayed on the electro-optical device 100 with an input function is scrolled. FIG. 13C shows the configuration of a personal digital assistant (PDA) to which the electro-optical device 100 with an input function is applied. The information portable terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002, and the electro-optical device 100 with an input function as a display unit. When the power switch 4002 is operated, various types of information such as an address book and a schedule book are displayed on the electro-optical device 100 with an input function.

  As an electronic apparatus to which the electro-optical device 100 with an input function is applied, in addition to those shown in FIG. 13, a digital still camera, a liquid crystal television, a viewfinder type, a monitor direct-view type video tape recorder, a car navigation device, a pager, Examples include electronic notebooks, calculators, word processors, workstations, video phones, POS terminals, bank terminals, and other electronic devices. The electro-optical device 100 with an input function described above can be applied as a display unit of these various electronic devices.

1 .. Touch panel, 2a .. Input area, 2b .. Peripheral area, 21 .. Input position detecting electrode, 23 .. Interlayer insulating film, 24 .. Conductive film for mounting, 27 .. Peripheral wiring, 35. Flexible wiring board, 90 ... cover glass, 90a ... first surface of cover glass, 90b ... second surface of cover glass, 94 ... light-shielding printed layer, 96 ... top coat layer, 100 ... input function With electro-optic device, 240 ...

Claims (8)

  On the first surface side of the cover glass on the input operation surface side and on the second surface side opposite to the first surface, a translucent input position detection electrode in the input region, and A translucent conductive film forming step of forming a translucent conductive film constituting a translucent peripheral wiring extending in a peripheral region outside the input region;
  A light-shielding printing step of forming a light-shielding printing layer in the peripheral region on the second surface side of the cover glass after forming the light-transmitting conductive film;
  A mounting conductive film forming step of forming a mounting conductive film electrically connected to the peripheral wiring on the light-shielding printed layer;
  A flexible wiring board connecting step of electrically connecting a flexible wiring board to the mounting conductive film on the light-shielding printing layer;
  A method for manufacturing a touch panel, comprising: In the translucent conductive film forming step, the input position detection electrode and the peripheral wiring are formed on the first surface side of the cover glass,
2. The touch panel according to claim 1, wherein in the mounting conductive film forming step, the mounting conductive film is formed by being electrically connected to the peripheral wiring via a side end surface of the cover glass . Manufacturing method . The corner portion where the first surface and the side end surface are connected to each other and the corner portion where the second surface and the side end surface are connected to each other are chamfered. Touch panel manufacturing method . Wherein the light-transmitting conductive film formation step, the manufacturing method as set forth in claim 1, characterized that you form the input position detection electrode and the peripheral wiring on the second surface side of the cover glass. Wherein the light-transmitting conductive film formation step, to extend the peripheral wiring to said end face,
In the light shielding printing step, the light shielding printing layer is formed on the upper layer side of the peripheral wiring,
The implementation conductive film formation step, producing a touch panel of claim 4 wherein the mounting conductive film by the end face side of the light-shielding printed layer characterized that you electrically connected to the peripheral wiring Way . 6. The method for manufacturing a touch panel according to claim 5, wherein the cover glass is chamfered at a corner portion where the second surface and the side end surface are connected to each other. In the light-shielding printing step, thereby forming the light-shielding printed layer on the upper side of the peripheral wiring, a contact hole is formed penetrating the light-shielding printed layer at a position overlapping with the peripheral wiring,
5. The touch panel according to claim 4 , wherein, in the mounting conductive film forming step, the mounting conductive film is formed by filling the contact hole with a conductive electric material from an upper layer side of the light-shielding printed layer . Manufacturing method . The said cover glass consists of tempered glass , The manufacturing method of the touchscreen as described in any one of Claim 1 thru | or 7 characterized by the above-mentioned.

Images