TWI622922B - Touch panel - Google Patents

Abstract

The present invention relates to a touch panel having a single-layer structure, the touch panel having an electrode structure of a transmitting electrode and a receiving electrode disposed orthogonally in two directions on the same surface of the substrate, and reducing the pull-out to the flexible substrate The manufacturing cost is reduced by the number of wirings. Since the overcoat layer (14) formed on the surface of the transmission lead (15a) has the contact hole (14a), the relevant electrode element in the transmission electrode element (12a) constituting the transmission electrode (12) can be electrically formed. In the connection, the transmission lead (15a) is connected to the transmission connection terminal (17a) disposed on the flexible substrate (16) provided at the end of the substrate (11).

Description

Touch panel

The invention relates to a projected capacitive touch panel capable of performing multi-point detection on a fingertip.

In recent years, in electronic devices such as mobile phones, tablet terminals, and e-book readers, and electronic devices such as car navigation systems, a display device (touch panel device) including a panel (touch panel) is mounted as an interface. In one form, the panel has a touch sensor function, and has the advantage of being intuitively operable and excellent in durability.

The touch panel is a position input device that detects a touch of a pointer such as a finger or a stylus and determines a coordinate of the touch position. In recent years, the demand for a projected capacitive touch panel has been gradually expanded. When the indicator body is approached, the capacitance change of the electrode in the vicinity of the indicator body is based on two electrode columns (longitudinal electrodes). The capacitance of the column and the lateral electrode column is detected and detected as a position coordinate on the touch panel.

The above-described projected capacitive touch panel is disclosed in Patent Document 1 below. The sensor portion of the touch panel is disposed on the back side of the glass substrate. Formed in the sensor portion: for detecting the proximity of the conductor a plurality of detecting electrodes in the case of the surface of the glass substrate; and wiring electrodes electrically connected to the detecting electrodes to transmit the detection signals to the external circuit.

The electrode structure disclosed in Patent Document 1 is an OGS (One Glass Solution) electrode structure. Forming an electrode (transmission electrode) disposed along the first direction and an electrode (receiving electrode) disposed along the second direction on the glass substrate by a photolithography technique, and intersecting the transmission electrode and the reception electrode A bridge structure capable of turning on the respective electrodes is used in part. Therefore, the above-described OGS type electrode structure has a problem that the manufacturing cost increases. Further, since the bridge structure of the wiring structure between the electrodes used in the OGS method can be visually observed from the outside, there is a possibility that the quality of the display as a touch panel device is degraded.

Patent Document 2 discloses an electrode structure (for example, a single-layer structure) in which electrodes parallel to each other in the X direction and parallel to the Y direction orthogonal to the X direction are formed on the same surface of the substrate. Electrode. By adopting the above-described single-layer structure disclosed in Patent Document 2, the photolithography process for forming the second layer required for the electrode structure disclosed in Patent Document 1 is no longer a necessary step. Therefore, the manufacturing cost of the above electrode structure can be reduced.

Prior Technical Literature Patent Literature

Patent Document 1: Japanese Laid-Open Patent Publication No. 2011-90443

Patent Document 2: Japanese Laid-Open Patent Publication No. 2010-182277

As disclosed in Patent Document 2, in the case of employing the electrode structure of the single-layer structure described above, two types of electrodes are disposed on the same surface of the substrate. Therefore, it is necessary to pull out a lead wire which is equivalent to the above-mentioned number of electrodes for conducting the above two kinds of electrodes.

In the electrode structure disclosed in Patent Document 2, the lead wire is drawn from a plurality of electrodes formed on the same surface of the substrate, and the lead wire is overlapped on the flexible substrate via an insulating layer. Methods. However, in the electrode structure, the size of the flexible substrate is increased. Therefore, there is a problem in that the number of members such as ACF (Anisotropic Conductive Film) used in the case of providing the above-mentioned substrate increases, which causes a problem that the manufacturing cost of the above-described electrode structure is improved.

The present invention has been made in view of the above problems, and an object of the invention is to provide a touch panel in which an electrode structure of the single-layer structure is formed by reducing a pull-out terminal that is pulled out from the glass substrate to the flexible substrate. The number can thereby suppress the manufacturing cost of the above electrode structure into a relatively inexpensive touch panel.

In order to achieve the above object, a first aspect of the present invention is a touch panel including: a transparent substrate having a front surface and a back surface, wherein the back surface has An operation region; the plurality of first electrodes, wherein the plurality of first electrode electrodes are configured to include a plurality of transmitting electrode elements arranged in parallel with the first direction in the operation region of the back surface of the substrate, and the transmitting electrode Each of the elements is arranged parallel to a second direction crossing the first direction and parallel to each other; a plurality of second electrodes, the plurality of second electrodes being configured to be on the back surface of the substrate a plurality of receiving electrode elements arranged in parallel with the second direction are provided in the operation region, and each row of the receiving electrode elements is disposed in parallel with the first direction and parallel to each other; the first lead, the first lead a lead wire is pulled out from the first electrode to an outer side of the operation region on the back surface side of the substrate; and a second lead wire is pulled out from the second electrode to the outer side of the operation region; An opaque conductive wiring, wherein the conductive wiring is used to connect the transmitting electrode elements constituting the first electrode Transmitting conductive electrode elements to each other; and a first insulating layer, the first insulating layer is formed as follows: not visually observed from the front surface side of the substrate to said conduction lines are formed in the surface.

A second aspect of the present invention is a touch panel, comprising: a transparent substrate having a surface and a back surface, wherein the back surface has an operation area; a plurality of first electrodes, wherein the plurality of first electrode electrodes are configured to include a plurality of transmitting electrode elements arranged in parallel with the first direction in the operation region of the back surface of the substrate, and each of the transmitting electrode elements Arranging in parallel with the second direction crossing the first direction and parallel to each other; the plurality of second electrodes, the plurality of second electrodes being configured to be in the operation region of the back surface of the substrate a plurality of receiving electrode elements arranged in parallel with the second direction, wherein each row of the receiving electrode elements is disposed in parallel with the first direction and parallel to each other; and the first lead is a first lead The first electrode is pulled out to the outside of the operation region on the back surface side of the substrate; the second lead is pulled out from the second electrode to the outside of the operation region; the opaque guide a general-purpose wiring, wherein the conductive wiring is used to connect the transmitting electrode in the transmitting electrode element constituting the first electrode The first insulating layer is formed such that the conductive wiring formed on the surface is not visually observed from the surface side of the substrate, and is on the surface of the first insulating layer Forming the first lead and the second lead; and a second insulating layer formed to cover the first lead and the second lead of the surface of the first insulating layer, and a surface of the second insulating layer is formed with a conductive position; The general-purpose wiring is electrically connected via a through hole formed in the conduction position.

In the touch panel of the present invention, in the operation region of the back surface of the transparent substrate having the front surface and the back surface, the first electrode formed of the transmission electrode elements arranged in parallel with the first direction The electrode elements associated with each of the transmission electrode elements are connected to each other via the conductive wiring formed on the surface of the first insulating layer. Further, in the above touch panel, the conductive wiring is electrically connected to the first lead, and the first lead is connected to the first connection terminal. Therefore, the number of the connection terminals provided on the flexible substrate can be reduced, and the size of the flexible substrate can be reduced. Thereby, the number of members such as ACF used when the flexible substrate is provided on the touch panel can be reduced. As a result, it is possible to suppress the cost at the time of manufacturing the touch panel.

1‧‧‧ touch panel

11‧‧‧Substrate

11a‧‧‧Back (opposite side of operation)

11b‧‧‧Surface (operation surface)

12‧‧‧Transmission electrode

12a‧‧‧Transmission electrode components

13‧‧‧ receiving electrode

13a‧‧‧ Receiving electrode components

13b‧‧‧Connecting wiring

14‧‧‧Overcoat

14a‧‧‧Contact hole

15‧‧‧ lead

15a‧‧‧Transmission lead

15b‧‧‧Receiving leads

15c‧‧‧General wiring

16‧‧‧Flexible substrate

17‧‧‧Connecting terminal

17a‧‧‧Send connection terminal

17b‧‧‧Receiving connection terminal

18‧‧‧Become the first insulating layer

19‧‧‧Be the protective layer of the second insulation layer

19a‧‧‧through hole

20‧‧‧Border Department

20a‧‧‧Width of the frame

E1‧‧‧Operating area

E2‧‧‧ lead area

Fig. 1 is a schematic plan view of a touch panel according to an embodiment of the present invention.

Fig. 2(a) is a schematic cross-sectional view showing a main part of a wiring structure (a first embodiment) of a transmitting electrode in the touch panel of Fig. 1, and Fig. 2(b) is a view showing a touch panel of Fig. 1 A schematic cross-sectional view of a main part of a wiring structure (morphological example 2) of a transmission electrode.

Hereinafter, embodiments for carrying out the invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments, and all other embodiments, examples, and application techniques that can be considered by those skilled in the art of the present invention in view of the above are all included in the scope of the present invention. .

In addition, in each of the drawings attached to the present specification, in order to facilitate the illustration and easy understanding, the scale, the aspect ratio, the shape, and the like may be appropriately changed to express the physical object, but it is a The examples are not intended to limit the invention.

Further, in the present specification, in the following description with reference to the attached drawings, in the case where the words of the up, down, left, and right are used to indicate the direction or position, these are observed with the user as shown in the figure. The top, bottom, left, and right of each figure are the same.

The touch panel 1 of the present embodiment is a projected capacitive touch panel. When the fingertip is close to the touch panel 1, the capacitance change of the electrode near the fingertip can be detected according to the change of the capacitance of the vertical electrode column and the lateral electrode column as the position coordinate on the touch panel 1. Thereby, multi-point detection of the above-mentioned fingertip can be achieved. When the touch panel device is manufactured, the touch panel 1 is disposed on a display device (a variety of display devices such as a liquid crystal display or an EL display) by adhesion or overlapping.

The configuration of the touch panel 1 of the present embodiment will be described. The shape of the touch panel 1 described above can be arbitrarily designed in accordance with the shape of the touch panel device to be manufactured, for example, rectangular (rectangular, square), circular, elliptical, polygonal, or the like.

As shown in FIG. 1( a ), the touch panel 1 of the present embodiment includes a substrate 11 having light transmissivity. The substrate 11 is provided with a surface 11b (see FIG. 2) serving as an operation surface, and a back surface 11a which is a surface opposite to the surface 11b. For example, the back surface 11a is a surface parallel to the surface 11b and opposite to the surface 11b. The touch panel 1 has a transmitting electrode (TX) 12 serving as a first electrode and a receiving electrode (RX) 13 serving as a second electrode on the back surface 11a, and both of which are single layers formed on the same surface Constructed electrode construction. Further, the touch panel 1 includes a flexible substrate 16 that is provided at an end of the substrate 11 and that is connected to an external control circuit (not shown) or the like.

In the present embodiment, by adopting the above-described single-layer structure as the electrode structure, it is not necessary to employ a bridge structure belonging to the wiring structure between the electrodes. Therefore, the bridge wiring formed of the opaque material is not seen from the outside when viewed visually, thereby improving the quality of the above display as the touch panel device. Further, since the lead wires 15 can be collectively arranged on one side, the width 20a of the frame portion 20 for surrounding the operation region E1 of the surface 11b can be reduced. As a result, the area of the above-described operation region E1 can be enlarged.

The substrate 11 is made of a substrate made of a light-transmitting insulating material, for example, a glass substrate or a film substrate. As the glass substrate, for example, an alkali-free glass, a soda lime glass, an aluminosilicate glass or the like can be used. Further, as the film type substrate, a transparent resin material such as polyethylene terephthalate (PET) or polycarbonate (PC) can be used.

The back surface 11a of the substrate 11 corresponds to the operation area E1 belonging to the observation area of the operator. The transmitting electrode 12 and the receiving electrode 13 serving as electrode portions are formed on the back surface 11a. Further, in the present embodiment, the operation region E1 indicates not only the surface (the operation surface) 11b of the substrate 11 actually operated by the operator but also the electrode formation region of the back surface 11a opposite to the operation surface 11b. The transmitting electrode 12 and the receiving electrode 13 are formed on the back surface 11a.

In the back surface 11a of the substrate 11, the transmitting electrode 12 is constituted by the transmitting electrode element 12a as a first electrode element. The transmission electrode element 12a can be formed by etching a transparent conductive material such as ITO (Indium Tin Oxide) by a photolithography technique or the like after forming a pattern by a photoresist. A plurality of them are arranged in parallel with the X direction (the horizontal direction (lateral direction) in the first drawing) belonging to the first direction. Further, on the substrate 11, the transmitting electrode 12 is arranged in parallel with the Y direction (upper and lower (longitudinal) direction in the first drawing) in the second direction intersecting the X direction, and is parallel to each other.

1(a) is an example in which the transmission electrode element 12a constituting the transmission electrode 12 is formed by arranging three laterally in a direction parallel to the X direction, and forming a row in the above-described row of the transmission electrode 12. Each of the transmission electrode elements 12a is arranged in three rows in parallel with the Y direction. Each of the above-described rows of the transmitting electrodes 12 is drawn with a different hatching to visualize the above-mentioned three rows of the transmitting electrodes 12 Said. Further, the shape of the transmitting electrode element 12a is not limited to the rhombic shape shown in Fig. 1, and may be arbitrarily designed as a circle, a rectangle, a polygon, or the like.

In the back surface 11a of the substrate 11, the receiving electrode 13 is constituted by a receiving electrode element 13a as a second electrode element. The receiving electrode element 13a can be formed by etching a transparent conductive material such as ITO or the like by a photolithography technique or the like after forming a pattern by a photoresist, whereby the plural can be arranged in parallel with the Y direction. One. Further, on the substrate 11, the receiving electrodes 13 are arranged in parallel with the X direction and parallel to each other. Further, the adjacent receiving electrode elements 13a in the respective rows of the receiving electrodes 13 are connected to each other by a connecting wiring 13b made of, for example, the above-mentioned transparent conductive material such as ITO.

In the first diagram (a), the receiving electrode elements 13a are respectively shown in a blank view, and three rows are arranged in parallel with the Y direction and the connection wiring 13b is interposed therebetween, and further, the X direction is further formed. Configure three lines in parallel. Further, the shape of the receiving electrode element 13a is not limited to the rhombic shape shown in Fig. 1, and may be arbitrarily designed as a circle, a rectangle, a polygon, or the like.

Further, on the surface of the transmitting electrode 12 and the receiving electrode 13, an overcoat layer 14 as an insulating layer can be formed by a general film forming method such as a screen printing method. As the material of the overcoat layer 14, it is preferable to use heat resistance, chemical resistance, smoothness, transparency, scratch resistance, and the above-described ITO as the above-mentioned transmitting electrode 12 and the above-mentioned receiving electrode 13. Insulating material with excellent adhesion. Insulation as described above As the material, for example, an acrylic resin, a polyester resin, an epoxy resin, a polyurethane resin, a melamine resin or the like can be used.

As shown in FIG. 1(a), the respective end portions of the transmitting electrode 12 and the receiving electrode 13 formed on the substrate 11 are pulled out from the operation region E1 on the substrate 11 via the lead wires 15 to A lead region E2 located outside the above-described operation region E1. Further, the transmitting electrode 12 and the receiving electrode 13 are connected to a terminal corresponding to the connection terminal 17 (the transmitting connecting terminal 17a and the receiving connecting terminal 17b) provided in the flexible board 16.

The lead wire 15 is a wire extending from the operation region E1 to the lead wire region E2, which is formed by the transmission electrode element 12a constituting the transmission electrode 12 and the reception electrode element 13a constituting the reception electrode 13. region.

In the present embodiment, the wiring drawn from each of the transmitting electrode elements 12a of the transmitting electrode 12 can be set as the transmitting lead 15a corresponding to the first lead. Further, the wiring drawn from the end of each row of the receiving electrodes 13 (the end of the receiving electrode element 13a closest to the flexible substrate 16 in Fig. 1(a)) can be set to be equivalent to the first The lead wire 15b for receiving the two leads. The transmission lead 15a and the reception lead 15b can be formed by using a transparent conductive material such as ITO, and then forming a film by a sputtering method, and then forming a predetermined pattern on the end portion of the substrate 11 by an etching method. .

The transmission lead wires 15a are respectively pulled out from the respective transmission electrode elements 12a constituting the transmission electrode 12 to the lead region. In the field E2, an arbitrary wiring structure shown in Fig. 2(a) or Fig. 2(b) is formed on the back surface 11a of the substrate 11.

Next, the wiring structure of the above-described transmission lead 15a will be described. In the touch panel 1 of the present embodiment, two types of wiring structures of the above-described transmission lead 15a as shown in Fig. 2(a) or Fig. 2(b) can be adopted. These forms can be arbitrarily selected in accordance with the structure of the touch panel 1 described above. In addition, in the second figure (a) and the second figure (b), the main part of the wiring structure of each form is observed from the direction parallel to the Y direction (the area surrounded by the broken line in Fig. 1(a) is enlarged. A diagram of a cross section at the ABCD line in Fig. 1(b).

(Form 1)

The wiring structure of the first embodiment is shown in Fig. 2(a). In the second diagram (a), the transmission lead 15a drawn from each of the transmission electrode elements 12a of the transmission electrode 12 is drawn to the surface of the decorative layer 18 which will be described later formed on the lead region E2. Further, at the conduction position of the overcoat layer 14, a contact hole 14a for exposing each of the transmission leads 15a is formed. Moreover, the above-described transmission leads 15a are electrically connected to each other via the conductive wiring 15c corresponding to the third lead. The material of the conductive wiring 15c may be selected to be opaque such as silver (Ag) or copper (Cu) (that is, the light transmittance is low and is easily observed from the surface side of the substrate 11). material.

Further, in the example of Fig. 2(a), the length of the wiring when pulling out from the transmitting electrode element 12a to the lead region E2 becomes the most In a short manner, the transmission lead 15a is pulled from the contact hole 14a closest to the transmission connection terminal 17a.

By using the wiring structure of the first embodiment, it is not necessary to provide the number of the transmission connection terminals 17a corresponding to the number of the transmission electrode elements 12a on the flexible substrate 16 as in the conventional wiring structure. Therefore, since the size of the flexible substrate 16 can be reduced, the number of members such as ACF used when the flexible substrate is mounted on a touch panel or the like can be suppressed to a small amount. As a result, in the case of manufacturing the above touch panel, it is possible to reduce the manufacturing cost.

(Form 2)

Fig. 2(b) shows the wiring structure of the morphological example 2. In the second diagram (b), the wiring structure of the first embodiment is used, and the transmission lead 15a formed on the surface of the decorative layer 18 corresponding to the first insulating layer is further formed to correspond to the second A protective layer 19 of the insulating layer. Further, a through hole 19a is formed in the conduction position of the conductive common line 15c of the protective layer 19 and the transmission lead 15a. Further, the contact hole 14a that communicates with the through hole 19a is formed to pass through the through hole 19a and the contact hole 14a, and the conductive wiring 15c and the transmission lead 15a can be electrically connected.

Further, in the present embodiment, the same material as the decorative layer 18 is used as the protective layer 19. However, the material of the protective layer 19 is not particularly limited as long as it has at least insulating properties and does not affect the product when it is formed into a touch panel device.

In the touch panel 1 of the present embodiment, the decorative layer 18 is formed, for example, by a screen printing method. Therefore, the surface of the decorative layer 18 may not be smooth but may be formed with fine irregularities. The transmission lead 15a is formed on the surface of the decorative layer 18. Therefore, when irregularities are formed on the surface of the decorative layer 18, the surface of the transmitting lead 15a also has an uneven shape. Therefore, a portion where the outer covering layer 14 of the transmitting lead 15a is peeled off may be formed, and the transmitting lead 15a is not properly covered to expose the surface of the wiring 15a. In this case, there is a possibility that the above-described transmission lead 15a to be insulated and the above-described conductive wiring 15c are short-circuited due to poor insulation.

Therefore, by using the wiring structure of the second aspect, it is assumed that the protective layer 19 can cover the outer cover even when the surface of the transmitting lead 15a is exposed by peeling of the outer covering layer 14 or the like. The layer 14 and the surface of the wiring 15a described above. Therefore, the insulation state of the above-described transmission lead 15a and the above-described conductive wiring 15c which should be insulated can be ensured. Therefore, there is no need to worry about causing the short-circuit problem described above, and the quality of the touch panel can be maintained.

The receiving lead 15b corresponding to the second lead is pulled out from the end of the receiving electrode element 13a closest to the flexible substrate 16 side of the receiving electrode 13 extending in the Y direction to The lead region E2 described above. Further, the receiving lead 15b is connected to the corresponding receiving connecting terminal 17b through the surface of the decorative layer 18.

The flexible substrate 16 is provided at a predetermined portion (near the end portion) of the substrate 11, and is connected to an external control circuit (for example, an IC circuit of a display device when the touch panel device is used). The connection terminals 17 connected to the lead wires 15 as shown in Fig. 1 are arranged in line on the flexible substrate 16. The connection terminal 17 is, for example, the transmission connection terminal 17a connected to the transmission lead 15a as the first connection terminal, and the connection terminal 15b connected to the reception lead 15b as a second connection terminal. The receiving connection terminal 17b described above.

The decorative layer 18 is provided on the outer side of the operation region E1 on the side of the back surface 11a of the substrate 11 by, for example, a screen printing method (for example, around the outer edge end portion of the back surface 11a of the substrate 11). The insulation layer. The decorative layer 18 has low light transmittance as compared with the above-described transmitting lead 15a and the receiving lead 15b. Therefore, by providing the decorative layer 18, it is possible to prevent the above-described conductive wiring 15c which is easily visually observed from the side of the operation surface 11b from the side of the operation surface 11b.

The material of the decorative layer 18 is preferably an insulating material which is excellent in the shielding rate, heat resistance, pressure resistance, and chemical resistance of the lead drawn from each electrode in the lead region E2. As such a material, for example, a polyester resin, an epoxy resin, a phenol resin, a polyoxymethylene resin, a polyimide resin, or the like can be used. Further, under the condition that the insulating property is ensured, the pigment or the like having the adjusted content can be mixed in the decorative layer 18, whereby the color of the decorative layer 18 can be adjusted to the color of the frame portion (not shown). Match.

Next, a method of forming the above-described transmitting electrode 12 and the above-described receiving electrode 13 will be described. Here, each of the first aspect and the second aspect of the wiring structure of the lead 15 described above will be described.

(Formation method of the above aspect example 1)

In the manufacturing method of the first aspect, the decorative layer 18 is first formed on a predetermined portion of the lead region E2 on the back surface 11a of the substrate 11. Then, a plurality of the transmitting electrodes 12 are formed in parallel with the Y direction and parallel to the Y surface of the substrate 11, and the transmitting electrode 12 is provided with a plurality of the transmitting electrode elements parallel to the X direction. 12a. In addition to the above-described transmitting electrode 12, the receiving electrode 13 is formed on the same surface of the substrate 11 in parallel with the X direction and parallel to each other, and the receiving electrode 13 is parallel to the Y direction. A plurality of the above-described receiving electrode elements 13a are continuously disposed via the connection wiring 13b.

In addition, the transmission lead 15a pulled out from each of the transmission electrode elements 12a of the transmission electrode 12 is drawn to the lead region E2. At the same time, the receiving lead 15b pulled out from the receiving electrode element 13a of the receiving electrode 13 is connected to the corresponding connecting terminal 17 of the flexible board 16. At this time, the transmitting lead 15a and the receiving lead 15b are formed on the surface of the decorative layer 18. Further, in the above-described transmission lead 15a, only one of the above-described transmission electrode elements 12a constituting the transmission electrode 12 is provided. The above-mentioned transmission lead 15a is connected to the corresponding transmission connection terminal 17a.

Next, when the above-described transmitting electrode 12 and the above-mentioned receiving electrode 13 are formed, an overcoat layer 14 is formed on the surface of these electrodes.

Thereafter, the contact hole 14a is formed by, for example, photolithography at a portion of the upper surface of the overcoat layer 14 formed above each of the transmission leads 15a. Then, the conductive wiring 15c is electrically connected via the contact hole 14a. Thereby, each of the transmission electrode elements 12a constituting the transmission electrode 12 is electrically connected to each other via the contact hole 14a.

Then, when the above-described conductive wiring 15c is disposed, the panel manufacturing step is completed. The conductive wiring 15c is formed above the overcoat layer 14 by, for example, a screen printing method.

(Formation method of the above aspect example 2)

Until the step of connecting the lead electrode 15 wound by the transmitting electrode 12 and the receiving electrode 13 to the connection terminal 17 and forming the overcoat layer 14 on the surface of the touch panel 1 excluding the connection terminal 17 The manufacturing method of the second aspect is the same as the manufacturing method of the first aspect. In the second aspect, after the outer covering layer 14 is formed, the protective layer 19 is further formed on the surface of the outer covering layer 14 so that a part of the lead wire 15 is covered.

Next, in order to electrically connect the transmission leads 15a pulled out onto the decorative layer 18, respectively, each of the above transmissions is used. The through hole 19a is formed in a portion which is formed above the lead 15a and which is a conduction position of the protective layer 19. In addition to the formation of the through hole 19a, the contact hole 14a is additionally formed on the outer cover 14 so as to communicate with the through hole 19a.

Further, when the conductive wiring 15c is formed by, for example, a screen printing method, and the wiring is over the protective layer 19, each of the transmitting electrodes 12 can be formed via the through hole 19a and the contact hole 14a. The above-described transmitting electrode members 12a are electrically connected to each other, thereby completing the panel manufacturing step.

As described above, in the touch panel 1 of the present embodiment, the contact layer 14a for forming the wiring structure of the transmitting electrode 12 and the receiving electrode 13 is formed on the overcoat layer 14, wherein the overcoat layer 14 is The surface of the transmission lead 15a connected to the transmission connection terminal 17a is formed. Then, the transmission lead 15a and the conductive common line 15c are electrically connected via the contact hole 14a. Thereby, the related electrode elements among the above-described transmitting electrode elements 12a constituting the above-described transmitting electrode 12 can be electrically connected to each other.

Thus, it is not necessary to provide the number of the transmission connection terminals 17a corresponding to the number of the transmission electrode elements 12a on the flexible substrate 16 as in the conventional wiring structure. Therefore, it is not necessary to increase the size of the above flexible substrate 16. Further, since the number of members such as ACF used when the flexible substrate 16 is placed on the touch panel 1 can be reduced, the manufacturing cost of the touch panel 1 can be suppressed to be relatively low.

Further, in the second aspect of the wiring structure, the surface of the decorative layer 18 which is the first insulating layer is formed. The protective layer 19 serving as the second insulating layer is further formed above the lead 15 . Further, the through hole 19a is formed at a position of the protective layer 19 that is electrically connected to the transmission lead 15a. Further, the contact hole 14a that communicates with the through hole 19a is formed, and the common wiring 15c and the transmission lead 15a are electrically connected via the through hole 19a and the contact hole 14a.

Thereby, even the overcoat layer 14 formed to cover the transmitting electrode 12 and the receiving electrode 13 formed above the decorative layer 18 formed by the screen printing method is peeled off or exposed. When the surface of the lead 15a is used, the surface of the outer covering layer 14 and the transmitting lead 15a can be covered by the protective layer 19, and the insulating state of the transmitting lead 15a and the conductive lead 15c can be ensured. Therefore, there is no need to worry about the above-mentioned short-circuit problem, and the quality of the touch panel can be maintained.

Claims (2)

A touch panel includes: a transparent substrate having a front surface and a back surface; the back surface having an operation region; a plurality of first electrodes, wherein the plurality of first electrodes are configured to be in the operation of the back surface of the substrate a plurality of transmitting electrode elements arranged in parallel with the first direction are provided in the region, and each row of the transmitting electrode elements is arranged parallel to a second direction crossing the first direction and parallel to each other; In the two electrodes, the plurality of second electrodes are configured to include a plurality of receiving electrode elements arranged in parallel with the second direction in the operation region of the back surface of the substrate, and the respective columns of the receiving electrode elements are Arranging in parallel with the first direction and parallel to each other; a first lead, the first lead being pulled out from the first electrode to an outer side of the operation area on the back side of the substrate; and a second lead The second lead is pulled out from the second electrode to the outer side of the operation area; the opaque conductive wiring is The common wiring is used to electrically connect the related transmitting electrode elements of the transmitting electrode elements constituting the first electrode to each other; and a first insulating layer formed to be incapable of being from the aforementioned surface of the substrate The above-described conductive wiring formed on the aforementioned surface was visually observed on the side. A touch panel includes: a transparent substrate having a front surface and a back surface; the back surface having an operation region; a plurality of first electrodes, wherein the plurality of first electrodes are configured to be in the operation of the back surface of the substrate a plurality of transmitting electrode elements arranged in parallel with the first direction are provided in the region, and each row of the transmitting electrode elements is arranged parallel to a second direction crossing the first direction and parallel to each other; In the two electrodes, the plurality of second electrodes are configured to include a plurality of receiving electrode elements arranged in parallel with the second direction in the operation region of the back surface of the substrate, and the respective columns of the receiving electrode elements are Arranging in parallel with the first direction and parallel to each other; a first lead, the first lead being pulled out from the first electrode to an outer side of the operation area on the back side of the substrate; and a second lead The second lead is pulled out from the second electrode to the outer side of the operation area; the opaque conductive wiring is The common wiring is used to electrically connect the transmitting electrode elements associated with the transmitting electrode elements constituting the first electrode to each other; the first insulating layer is formed such that the first insulating layer cannot be formed from the front surface side of the substrate The conductive wiring formed on the surface is visually observed, and the first lead and the second lead are formed on a surface of the first insulating layer; a second insulating layer, the second insulating layer is formed to cover the first lead and the second lead of the surface of the first insulating layer, and a conductive position is formed on a surface of the second insulating layer, and the guiding The general wiring is electrically connected via a through hole formed in the above-described conduction position.