JP2005071123A - Touch panel and electronic equipment using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch panel mounted on the display face side of a liquid crystal display or the like and having superior surface smoothness and environment resistance. <P>SOLUTION: A configuration is made by including insulating layers 27 for correcting a difference in level to uniform film thickness on a frame-like outer periphery section sticking and fixing a first transparent substrate 21 to a second transparent substrate 31, in a facing state to eliminate difference in levels. An adhesive 29 or the like is disposed above the insulating layers to make a portion between the substrates 21, 31 stick. Thus, the stuck and fixed state is stabilized, and adhesive strength is enhanced to create the touch panel applicable to the on-vehicle touch panel having the superior surface smoothness and environment resistance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a touch panel that is mounted on a display surface side of a liquid crystal display device or the like and can input a coordinate position by a pressing operation with a pen or a finger corresponding to display contents, and an electronic device using the touch panel.

  2. Description of the Related Art In recent years, various electronic devices including portable devices have been widely used that use a touch panel that can input a coordinate position by a pressing operation with a pen or a finger corresponding to display contents.

  There are several types of touch panels, but the most commonly used resistive film analog type touch panel will be described below with reference to the drawings.

  In each drawing, the dimension in the thickness direction is shown enlarged so that the configuration can be easily understood.

  13 is a top view of a conventional touch panel, FIG. 14 is an exploded perspective view thereof, and FIG. 15 is a cross-sectional view taken along the line AA of FIG.

  In the figure, reference numeral 1 denotes a light transmissive first transparent substrate. On the upper surface of the first transparent substrate 1, a first transparent conductive material made of indium tin oxide (hereinafter referred to as ITO) or the like is formed by sputtering or the like. A film 2 is formed on the entire surface.

  And the center area | region of the 1st transparent substrate 1 shown with a dotted line in FIG. 13 is an operation area | region of the said touchscreen comprised in rectangular shape, and the said area position on said 1st transparent conductive film 2 has insulating property. The dot spacers 5 (see FIG. 15) with minute dimensions made of epoxy resin or the like are provided at a predetermined pitch.

  In addition, as said 1st transparent substrate 1, the thing of materials, such as a glass plate, the polycarbonate resin processed into a sheet form, an acrylic resin, or a biaxially-stretched polyethylene terephthalate film, a polycarbonate film, is used.

  Reference numeral 3 denotes a light transmissive second transparent substrate disposed opposite to the first transparent substrate 1, and a second transparent conductive film 4 made of ITO or the like is formed on the entire lower surface thereof by sputtering or the like. The first transparent conductive film 2 and the second transparent conductive film 4 are arranged in an opposing state while maintaining a predetermined interval, including within the operation area of the touch panel provided with the dot spacers 5.

  As described above, the first transparent conductive film 2 and the second transparent conductive film 4 are both formed on the entire surfaces of the substrates 1 and 3, that is, etchingless in which unnecessary portions are not etched. Something is used.

  And this 1st transparent substrate 1 and the 2nd transparent substrate 3 are adhere | attached by the frame-shaped outer peripheral part provided so that the said operation area | region outer side might be surrounded, and the said opposing state is maintained.

  In addition, a hard coat with a pencil hardness of 3H made of an acrylic resin is applied to the upper surface of the second transparent substrate 3 on the operated side in order to protect the occurrence of scratches or the like that are likely to occur during operation with a pen or a finger. Layer 6 is provided.

  Reference numeral 7 denotes an FPC for external device connection that is electrically connected to each of the first transparent conductive film 2 and the second transparent conductive film 4.

  Here, the configuration of the outer peripheral portion bonding the first and second transparent substrates 1 and 3 will be described. Hereinafter, the side where the FPC 7 is installed will be described as the front side in accordance with the illustrated state of FIG. To do.

  As shown in FIGS. 14 and 15, the first transparent substrate 1 has the front edge and the left and right sides in the outer part around the operation region on the first transparent conductive film 2 formed on the entire surface. An undercoat resist 11 made of an insulating material is formed in a U shape at the side edge position.

  The undercoat resist 11 is usually formed by screen printing using an epoxy resin, an acrylic UV resin, or the like.

  Note that the undercoat resist 11 is often constituted by two times of repeated printing in order to ensure insulation.

  On the first transparent conductive film 2, linear electrodes 12 are respectively formed at the front position in the U-shape of the undercoat resist 11 and the rear edge position of the first transparent substrate 1. Yes.

  The pair of electrodes 12 are arranged in an electrically connected state directly on the first transparent conductive film 2 in parallel with each other.

  In addition, the wiring pattern 12A connected to each of the pair of electrodes 12 has the undercoat to prevent inadvertent electrical contact with the first transparent conductive film 2 formed on the entire surface of the first transparent substrate 1. The resist 11 is drawn around, and its end is collected at the center position of the front side of the first transparent substrate 1.

  In addition, a wiring pattern 13A for the second transparent conductive film 4 of the second transparent substrate 3 is also routed on the undercoat resist 11 of the substrate 1, and the end thereof is similarly formed on the first transparent substrate 1. Are gathered at the center of the front side.

  On the other hand, on the second transparent conductive film 4 of the second transparent substrate 3, linear electrodes 14 are respectively formed at the end positions of the left and right opposite sides that are in a positional relationship orthogonal to the electrodes 12.

  The electrodes 14 are arranged in an electrically connected state directly on the second transparent conductive film 4 in parallel with each other.

  Each of the electrodes 14 is connected to an upper end of an electrical connection conductor 15 disposed on the wiring pattern 13A, and each electrode 14 is connected to the substrate 1 via the electrical connection conductor 15. The wiring pattern 13A is electrically connected.

  And in the 1st transparent substrate 1 in which each layer etc. were formed as mentioned above, the upper surface of the electrode 12 and the wiring patterns 12A and 13A is covered with an overcoat resist 16 in a frame shape, and is further overlapped above the frame shape. The first transparent substrate 1 and the second transparent substrate 3 are disposed in an opposed state by adhering the adhesive 17 disposed on the second transparent substrate 3 to the second transparent substrate 3.

  Next, the operation of the conventional touch panel configured as described above will be described.

  First, by pressing a predetermined position from above the second transparent substrate 3 with a finger or a pen, the second transparent substrate 3 is partially bent downward about the operation location, and the first transparent conductive material corresponding to the operation location is obtained. The film 2 and the second transparent conductive film 4 are in contact with each other.

  At this time, portions other than the above-described operation locations are restricted by the dot spacers 5 and maintained in a non-contact state.

  In this state, a predetermined voltage is alternately applied to the electrodes 12 and 14 of the first transparent conductive film 2 and the second transparent conductive film 4, and a voltage ratio at the contact point is derived through the FPC 7, Originally, the input operation position was detected by an external circuit.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP-A-4-284525

  However, in the conventional touch panel, in order to ensure insulation, the undercoat resist 11 is often overprinted on the first transparent substrate 1 side, and the thickness of the undercoat resist 11 is about 30 to 50 μm. If the overcoat resist 16 or the adhesive 17 is overlaid, the height position is uneven between the portion where the undercoat resist 11 is present and the portion where it is not present. The substrates 1 and 3 must be bonded under heating and pressing conditions that can easily absorb the influence.

  That is, if there is a defect in the heating and pressing state, for example, as shown in FIG. 16, a range of the width X where the adhesive force by the adhesive 17 cannot be sufficiently developed due to the effect of the stepped portion occurs, and the adhesive is wide and wide. In spite of constituting 17, the surface smoothness of the second transparent substrate 3 is lost due to a partial adhesion state with the second transparent substrate 3 and a decrease in the adhesion force. It may be unfavorable in terms of appearance or dignity.

  In order to prevent this phenomenon, the heating and pressing conditions during the bonding operation between the substrates 1 and 3 must be heated and pressed at a relatively high temperature and pressure for a long time, thereby reducing the number of work steps, etc. It was difficult to do.

  In addition, touch panels have recently been used in in-vehicle applications such as navigation systems, and in particular, in vehicles, demands for strict environmental resistance characteristics are required. There is a demand for a narrow frame with a small outer shape but a wide operation area, that is, a narrow width of the outer peripheral portion that serves as a bonding portion between the substrates.

  The present invention solves such a conventional problem, and the substrate can be bonded and fixed at the outer peripheral portion more stably than the conventional one, and the surface smoothness can be achieved even if the outer peripheral portion is narrow. An object of the present invention is to provide a touch panel excellent in performance and environmental resistance and an electronic device using the same.

  In order to achieve the above object, the present invention has the following configuration.

  The invention according to claim 1 of the present invention includes a first transparent substrate having a first transparent conductive film formed on an upper surface, a second transparent substrate having a second transparent conductive film formed on a lower surface, and each of the conductive films. It consists of a frame-shaped outer periphery that adheres the transparent substrates in a state of being opposed to each other at a predetermined interval. The outer periphery includes an insulating layer for step correction, and the step is corrected by the insulating layer. It is a touch panel in which the substrates are bonded to each other by a pressure-sensitive adhesive layer arranged at a uniform height position, and a pressure-sensitive adhesive is disposed on the portion where the height position is uniformed by an insulating layer for level difference correction. Adhering to each other makes it possible to achieve a stable and strong adhesion between the substrates, making it possible to handle a narrow frame at the outer periphery, and excellent surface smoothness and environmental resistance even under severe environmental conditions. Touch panel can be easily realized and the adhesive has a uniform height Because it is arranged in location, effect that bonding work efficiency likely to be also uniformly dispersed such conduction state of the heat and pressure can be improved is obtained.

  According to a second aspect of the present invention, in the first aspect of the present invention, a flexible wiring board (hereinafter referred to as FPC) for connecting an external device is connected to one side of either the first transparent substrate or the second transparent substrate. In addition, the substrate on which the FPC is not installed is provided with a cutout for releasing the outer shape of the FPC, and electrodes of the transparent conductive film of the substrate are installed on the side with the cutout and on the opposite side. After bonding the first transparent substrate and the second transparent substrate, the FPC can be easily arranged, the FPC connection condition setting and the connection work are easy, and the touch panel can be configured with good workability. Is obtained.

  Furthermore, when the electrode of the transparent conductive film of the substrate is installed on the side with the notch and the opposite side thereof, the linearity characteristics can be eliminated without affecting the linearity of the transparent conductive film of the substrate due to the notched portion. Can also be easily maintained, and an effect of being excellent in characteristics can also be obtained.

  The invention according to claim 3 is the invention according to claim 1, wherein the FPC for connecting external devices is connected to one side of either the first transparent substrate or the second transparent substrate, and the FPC is connected. An electrical connection conductor that is electrically connected to the electrode of the transparent conductive film on the other side substrate is installed only on one side, and only on the side where the FPC that has the widest outer peripheral part and is required is installed. Since it is the structure which arrange | positions an electrical connection conductor, the electrical connection conductor of a big external shape can be arrange | positioned, and the effect that the connection state can be made more stable is acquired.

  The invention according to claim 4 is the invention according to claim 1, wherein the FPC for connecting an external device is sandwiched and installed between the first transparent substrate and the second transparent substrate. Although it is somewhat inferior, there is an advantage that even a substrate material such as glass can be easily configured as long as it is the configuration, and there is an advantage that there is no restriction on the side where the electrode to the transparent conductive film is installed. Therefore, the effect of increasing the degree of freedom in pattern design can be obtained.

  The invention according to claim 5 is the invention according to claim 1, wherein the FPC for connecting an external device is a double-sided board type, and is sandwiched and installed between the first transparent substrate and the second transparent substrate. A wiring pattern derived from the electrode of the transparent conductive film of each substrate is electrically connected to each of the wiring portions arranged on both sides of the FPC, and the electrical connection is made between the first transparent substrate and the second transparent substrate. There is no need to provide a special connection conductor, and the wiring pattern portion can be saved in space. As a result, the frame-like outer peripheral portion can be made narrower and a touch panel with a wide operation area can be realized.

  The invention according to claim 6 is the invention according to claim 1, wherein a polarizing plate or a circularly polarizing plate is disposed on the second transparent substrate, and the second transparent substrate has a high adhesive force at the outer peripheral portion. Since it adhere | attaches on the 1st transparent substrate, even if curvature will generate | occur | produce in a polarizing plate or a circularly-polarizing plate, the effect that the influence degree of the curvature can be reduced is acquired.

  According to a seventh aspect of the present invention, the touch panel according to the first aspect is disposed on the display surface side of the display device, and a predetermined signal obtained by operating the touch panel is determined by the control circuit unit to operate a predetermined function. Because it is an electronic device and the touch panel is excellent in surface smoothness and environmental resistance, it can be realized that the electronic device using the touch panel has good quality and excellent environmental resistance. The effect is obtained.

  As described above, the present invention includes an insulating layer for correcting a film thickness difference in a frame-like outer peripheral portion that bonds and fixes the first transparent substrate and the second transparent substrate in an opposing state, and the step is corrected by the insulating layer. Because the touch panel is made by adhering the substrates with the adhesive layer placed at a uniform height position, the adhesive fixing state is stabilized and the adhesive force is also improved. As a result, the width of the outer peripheral part is narrowed. In addition, it is possible to obtain an advantageous effect that a material having excellent surface smoothness and environmental resistance and capable of complying with severe environmental resistance characteristics such as in-vehicle use can be obtained.

  Also, an electronic device using this touch panel can be realized with a good quality and excellent environmental resistance.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
The first aspect of the present invention will be described using the first embodiment.

  In addition, although it demonstrates using drawing below, as a drawing, the dimension of the thickness direction is expanded and shown so that a structure may be understood easily.

  FIG. 1 is a top view of a touch panel according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a cross-sectional view taken along line AA of FIG.

  In the figure, reference numeral 21 denotes a first transparent substrate having a rectangular outer shape made of soda glass. On the upper surface of the first transparent substrate 21, a first transparent conductive material made of indium tin oxide (hereinafter referred to as ITO) or the like. A film 22 is formed on the entire surface, and a portion within the operation region (region within a dotted line shown in FIG. 1) in the center on the first transparent conductive film 22 has a minute dimension by an insulating epoxy resin as in the prior art. Dot spacers 20 are provided at a predetermined pitch.

  On the other hand, 31 is a second transparent substrate having a rectangular outer shape made of a biaxially stretched polyethylene terephthalate film having a thickness of 188 μm, and a second transparent conductive film 32 made of ITO is formed on the entire lower surface of the second transparent substrate 31. The first transparent substrate 21 and the second transparent substrate 31 are formed in a frame shape, which will be described later, so that the second transparent conductive film 32 is maintained at a distance of about 20 to 500 μm from the first transparent conductive film 22. It is bonded at the outer periphery.

  In addition, on the upper surface side of the second transparent substrate 31 to be operated, a hard coat with a pencil hardness of 3H made of acrylic resin is used to protect scratches and the like that are likely to occur during operation with a pen or a finger. A layer 33 is provided.

  Reference numeral 40 denotes a flexible wiring board (hereinafter referred to as FPC) that is electrically connected to the first and second transparent conductive films 22 and 32, and is bonded to a substantially central position on one side of the outer peripheral portion of the first transparent substrate 21. It is fixed.

  Hereinafter, the side on which the FPC 40 is installed will be described as the front side in accordance with the illustrated state of FIG.

  As shown in FIG. 1, the second transparent substrate 31 is formed in a rectangular shape smaller than the first transparent substrate 21 by the installation width of the FPC 40, and the entire upper surface of the FPC 40 is exposed upward. It is attached to the first transparent substrate 21 in a state.

  Here, the structure of the frame-shaped outer peripheral part which adhere | attaches between both the said board | substrates 21 and 31 is demonstrated.

  First, from the first transparent substrate 21 side, as shown in FIG. 2, on the first transparent conductive film 22, an undercoat resist made of an epoxy-based resin is located at the front edge portion and the left and right edge portions. 23 is formed in a U-shape when viewed from above.

  The undercoat resist 23 may be formed by stacking multiple layers.

  Reference numeral 24 denotes a pair of linear electrodes arranged in parallel with each other on the first transparent conductive film 22, one of which is at the front position in the U-shape of the undercoat resist 23 and the other is the first electrode. It is arranged at the position of the rear edge of the transparent substrate 21.

  The wiring pattern 24A extending from each of the pair of electrodes 24 is routed on the undercoat resist 23 and collected at the front center position of the first transparent substrate 21 serving as the FPC 40 installation portion, and its end portion is the front portion. It is derived toward the edge.

  The electrode 24 and the wiring pattern 24A are both made of silver powder and polyester resin.

  In addition, wiring patterns 25A are also arranged on the left and right side portions on the undercoat resist 23. These wiring patterns 25A are also routed on the undercoat resist 23 so as to be in front of the first transparent substrate 21. Collected at a central position, the end is led out toward the front edge.

  This wiring pattern 25A is arranged for the second transparent conductive film 32, and is made of silver powder and polyester resin, like the electrode 24 and the wiring pattern 24A.

  On the wiring patterns 25A arranged on the left and right side positions, several electrical connection conductors 26 made of silver powder and polyester resin are arranged.

  Reference numeral 27 denotes an insulating layer disposed so as to cover the electrode 24 formed at a lower position than the other wiring pattern 24A and the like because the undercoat resist 23 is not formed. In order to make the film thickness height position uniform, each electrode 24 is formed linearly.

  The frame-shaped outer peripheral portion on the first transparent conductive film 22 composed of the undercoat resist 23 and the insulating layer 27 is configured such that the front, rear, left and right sides are almost at the same height position.

  The inner area of the frame-shaped outer periphery is a rectangular operation area, and the dot spacer 20 described above is formed in this area.

  On the frame-shaped outer peripheral portion configured as described above, an overcoat made of an epoxy resin is used to ensure insulation, except for the location where the electrical connection conductor 26 is disposed and the installation portion of the FPC 40. An acrylic adhesive 29 is formed in a frame shape, with the coat resist 28 being further stacked thereon.

  In this way, the insulating layer 27 is provided, and the adhesive 29 is disposed after the step height is corrected and the film thickness is made uniform. Including, it will be arranged at a uniform height position.

  On the other hand, on the second transparent conductive film 32 of the second transparent substrate 31, linear electrodes 30 made of silver powder and polyester resin are arranged in parallel with each other at the positions of the left and right side edges. ing.

  And the 2nd transparent conductive film 32 is adhere | attached on the said adhesive 29 formed in the uppermost layer of the 1st transparent substrate 21 outer peripheral part, and the 2nd transparent substrate 31 with the electrode 30 is the 1st transparent substrate 21 and predetermined spacing. It is bonded and fixed in a state where

  The FPC 40 described above has a wiring portion only on the lower surface, and this wiring portion is anisotropically formed on the upper exposed portions of the ends of the wiring patterns 24A and 25A collected at the center of the front side on the undercoat resist 23. It is heat-sealed through a conductive film or the like and is electrically and mechanically attached.

  Here, a method for manufacturing the touch panel having the above-described configuration will be briefly described.

  First, the first transparent conductive film 22 made of ITO is formed on the surface of the first transparent substrate 21 by sputtering.

  On the other hand, on the second transparent substrate 31, a hard coat layer 33 is formed on the upper surface by applying a paint mainly composed of an acrylic resin with a roll coater, and a second transparent conductive film 32 is formed on the lower surface by sputtering. To do.

  And on the 1st transparent conductive film 22 of the 1st transparent substrate 21, while forming the dot spacer 20 in the part corresponding to an operation area | region by screen printing, the undercoat resist 23, the electrode 24, wiring in the outer peripheral part The patterns 24A and 25A, the thickness difference correcting insulating layer 27, and the like are printed and formed so as to have the above-described configuration.

  Then, the pressure-sensitive adhesive 29 is printed on the overcoat resist 28 and further on the upper layer over the outer peripheral portion where the insulating layer 27 for level difference correction is formed and the film thickness is made uniform.

  At this time, the overcoat resist 28 and the pressure-sensitive adhesive 29 can be easily formed in a uniform state in which the entire height of the frame-shaped outer peripheral portion is necessary and the height positions are uniform.

  On the other hand, on the second transparent conductive film 32 of the second transparent substrate 31, the electrodes 30 are printed and formed at the positions of the left and right side edges, respectively.

  In addition, at the time of printing each of these layers and patterns, a large-size glass or film may be used, and a multi-catch configuration in which a large number of individual touch panels are arranged in a plane may be used.

  After that, the first transparent substrate 21 made of glass is scribed and cut, and the second transparent substrate 31 made of polyethylene terephthalate film is cut and made into individual touch panel sizes.

  Subsequently, the first transparent substrate 21 and the second transparent substrate 31 are positioned and bonded together so that the first transparent conductive film 22 and the second transparent conductive film 32 are in an opposing state.

  Then, it is set as the outer periphery pressing process for strengthening the adhesiveness of the outer periphery, and is pressed from above the second transparent substrate 31 by applying a predetermined pressure with a jig or the like whose position of the outer periphery is set to a predetermined temperature. .

  At this time, since the adhesive 29 has been printed and formed in a state where the entire required width is uniform over the entire circumference of the frame-shaped outer peripheral portion, the heat and pressure are uniformly conducted and act. Even in the pressing step with this pressing jig, the number of man-hours can be reduced, and the bonded state can be easily obtained surely bonded over the entire outer periphery of the frame shape.

  Then, after passing through an aging process for stabilizing the surface smoothness as the next process, the FPC 40 is heat-sealed to the FPC 40 installation portion of the first transparent substrate 21 using an anisotropic conductive film or the like. Completed as a touch panel.

  In addition, since the in-process product is in the same adhesive width as in the conventional case or in a stronger adhesive state in the case of the same adhesive width, the work after the aging process can be assembled in a more stable state, In addition, since the degree of influence such as heat on the outer peripheral portion transmitted during the heat sealing of the FPC 40 is also reduced, a high quality product with excellent appearance and the like can be easily obtained.

  In addition, since the adhesive state at the outer peripheral portion between the substrates is more firmly bonded over the entire outer periphery of the frame shape than the conventional one, the adhesive 29 Reliability can be ensured even if the width dimension is set narrow.

  The operation of the touch panel according to the present embodiment configured as described above is performed by pressing a predetermined position in the operation area with a finger or a pen from above the second transparent substrate 31 as in the conventional case. The second transparent substrate 31 is partially bent downward about the operation portion, the first transparent conductive film 22 and the second transparent conductive film 32 are partially contacted, and the voltage ratio at the contact point is determined as FPC 40. And is detected by an external circuit.

  At this time, the portions other than the operation location are restricted by the dot spacer 20, and the non-contact state is maintained between the conductive films 22 and 32 as in the conventional case.

  Next, examples of the actual use size of the touch panel according to the first embodiment having the above-described configuration will be described.

  As a size to be mounted on an electronic device, a size that is mounted on a 7-inch liquid crystal (about 170 mm × 110 mm) is frequently used. In this case, for example, the outer peripheral width is the electrical connection conductor 26. The width of the left and right sides is 2 to 8 mm, the front side is 4 to 8 mm, the rear side is 1.5 to 4 mm, the electrical connection conductor 26 is 1 to 1.5 mm square, and the width of the adhesive 29 is electrically connected. When the width of the outer peripheral portion of the side where the conductor 26 is 2 to 8 mm, under a high temperature and high humidity environment of 60 ° C. and 95% RH, under a high temperature environment of 95 ° C. and under a low temperature environment of −40 ° C. Left for 1000 hours or more, or as heat cycle conditions, -40 ° C for 0.5 hour, 85 ° C for 0.5 hour as a cycle of 1000 cycles. Resistance value, straight line Without deterioration of the main electrical characteristics etc., surface smoothness even substantially maintaining the initial state, deterioration of the appearance or on dignity that there was no occurring.

  Similar results were obtained even with a 10-15 inch liquid crystal size.

  As a result of the above, as a result of the provision of the insulating layer 27 for uniform film thickness, the substrates 21 and 31 are made of the adhesive 29 that is configured to have a full width necessary for the entire outer periphery and no step. This is considered to be a result of stable and high adhesive strength and reliable adhesion. With this configuration, a touch panel excellent in surface smoothness and environmental resistance can be easily realized.

  As the first transparent substrate 21, in addition to the soda glass described above as an example, general extrusion molding, casting molding, or injection molding of methacrylic resin, polyolefin resin, polycyclohexadiene resin, norbornene resin, etc. May be used, and a film such as a biaxially stretched polyester film or a polycarbonate film may be used, and a thickness of 0.1 to 10 mm, preferably 0.15 to 3 mm is practical.

  Further, as the second transparent substrate 31, in addition to biaxially stretched polyethylene terephthalate, stretched films such as biaxially stretched polyethylene naphthalate and uniaxially stretched polyethylene terephthalate, polycarbonate or polyolefin film by casting method, and the thickness thereof can be used. A thickness of 0.01 to 0.4 mm, preferably 0.025 to 0.2 mm is practical.

As the first transparent conductive film 22 and the second transparent conductive film 32, in addition to ITO, tin oxide (SnO ₂ ), zinc oxide (ZnO), gold (Au) thin film, silver (Ag) thin film, etc. may be used. As the formation method, in addition to the above sputtering, CVD (Chemical Vapor Deposition), vacuum deposition, ion plating, coating and baking of metal organic matter, and the like may be used.

  Furthermore, the undercoat resist 23, the overcoat resist 28, and the insulating layer 27 for uniform film thickness can be made of an epoxy resin, an acrylic resin, a polyester resin, a urethane resin, a phenol resin, or the like. It is important to select one that has good adhesion to the printed surface.

  The electrodes 24, 30 and the wiring patterns 24A, 25A, and the electrical connection conductor 26 may be made of silver powder and polyester resin, or mixed powder of silver powder and carbon powder, copper powder, gold powder, or the like as the conductive powder. Also, the resin component can be appropriately selected from epoxy, phenol, acrylic, urethane, and the like suitable for electrical resistance value, adhesion, dispersibility of conductive powder, environmental resistance, and the like.

  As a method of forming each layer constituting the outer peripheral portion, a printing method other than screen printing, for example, offset printing, or other ink coating methods, for example, an ink patterning coating method using a drawing head may be used.

  In particular, when forming the electrical connection conductor 26 requiring a high film thickness of 100 μm or more, an ink filling method using a dispenser or the like can be used. As the adhesive 29, a double-sided adhesive tape is patterned. It may be processed and bonded together.

  The step correction insulating layer 27 for uniform film thickness is ideally formed with exactly the same film thickness as the undercoat resist 23, but with respect to the film thickness of the undercoat resist 23, If it is in the range of about 10 to 20 μm, the same effect can be obtained.

  It is preferable that the insulating layer 27 is first printed and formed as described above, because the height position of the adhesive 29 disposed via the overcoat resist 28 tends to be more stable. May be printed and an insulating layer for correcting the step may be formed thereon, and the adhesive 29 may be disposed on a part of the overcoat resist and the insulating layer.

  In the above, an etching-less type in which a transparent conductive film is disposed on the entire surface of the substrate has been described as an example. However, the transparent conductive film is left only in necessary portions such as the operation region and its outer periphery, and other portions are etched. Even if it is removed in the above, if the outer peripheral part that includes a step compensation insulating layer for uniform film thickness is formed in the outer peripheral part that bonds between the substrates, the adhesive stability between the substrates is excellent Is easily obtained.

(Embodiment 2)
The second embodiment of the present invention, particularly, the inventions described in claims 2 and 3 will be described.

  4 is a top view of a touch panel according to a second embodiment of the present invention, FIG. 5 is an exploded perspective view thereof, FIG. 6 is a cross-sectional view taken along line AA of FIG. 4, and FIG. It is sectional drawing in a B line.

  In addition, about the component similar to the structure of Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in the figure, the touch panel according to the present embodiment also has a frame in which the first and second transparent substrates 21 and 31 face each other while maintaining a predetermined distance between the first and second transparent conductive films 22 and 32. It is the same as in the case of the first embodiment that the FPC 40 is attached and fixed on the outer peripheral portion of the shape and the front side thereof is mounted.

  As shown in FIG. 4, the second transparent substrate 31 has a rectangular shape whose outer shape is almost the same size as the first transparent substrate 21, and is located at a position corresponding to the installation portion of the FPC 40 than the FPC 40 outer shape. A slightly larger notch 31A is used.

  The touch panel according to the present embodiment differs from that according to the first embodiment in the configuration of the frame-shaped outer peripheral portion including various wiring routing states, and here, the configuration of the outer peripheral portion will be described.

  As shown in FIG. 5, on the first transparent conductive film 22 of the first transparent substrate 21, an undercoat resist 41 </ b> A is linearly formed at the rear side edge position, and linearly under the front side edge position. The coat resists 41B are respectively disposed with a film thickness of 45 μm.

  At this time, the undercoat resist 41B on the front side is formed with the same width as that according to the first embodiment because the FPC 40 is installed.

  The linear electrodes 42 are arranged in parallel with each other at the left and right side edge positions on the first transparent conductive film 22 that are opposite to the undercoat resists 41A and 41B.

  The pair of electrodes 42 is directly disposed on the first transparent conductive film 22, and the wiring pattern 42 </ b> A extending from the front end of each electrode 42 is routed around the undercoat resist 41 </ b> B to be centered forward. Collected at a position, its end is led out towards the front edge.

  Then, the insulating layer 43 for level difference correction for equalizing the film thickness is positioned on the left and right side edge portions so as to cover each electrode 42 and to be the same height as the undercoat resists 41A and 41B. Each of the undercoat resists 41A and 41B and the insulating layer 43 forms a frame-shaped outer periphery, and an overcoat resist 44 and an adhesive 45 are formed on the frame-shaped outer periphery. Has been.

  On the other hand, on the second transparent substrate 31 side, an undercoat resist 41C is formed in a substantially U-shape with a film thickness of 45 μm at the front side and the left and right side edge positions on the second transparent conductive film 32.

  In addition, a pair of linear electrodes 46 are also directly disposed on the second transparent conductive film 32, and one of the electrodes 46 is positioned forward in a region surrounded by a U-shaped undercoat resist 41C. In addition, the other electrode 46 is arranged in parallel with each other at the position of the rear edge of the substrate 31.

  In the arrangement state of the electrode 46, the influence on the linearity characteristic at the time of voltage application can be reduced in the second transparent conductive film 32 that is not rectangular due to the provision of the notch 31A.

  The wiring pattern 46A extending from each electrode 46 is routed to the front center position of the second transparent substrate 31 on the undercoat resist 41C.

  Then, an insulating layer 47 for level difference correction is formed with a film thickness of 45 μm so as to cover each electrode 46, and a frame-shaped overcoat resist 48 is further formed on the frame-shaped outer peripheral portion having a uniform height. Is formed.

  Further, a wiring pattern 46B is disposed on the undercoat resist 41B of the first transparent substrate 21, and each wiring pattern 46A is opposed to each corresponding wiring pattern 46B in the vertical direction and is electrically connected to each other. 49.

  If the electrical connection conductor 49 is provided in the front portion where the FPC 40 having the widest outer peripheral portion is required, the size of the electrical connection conductor 49 can be increased and the connection stability is excellent. Become.

  The wiring patterns 46B are also collected at the front center position, and the end portions thereof are led out toward the front side end portions.

  In the portion where the electrical connection conductor 49 is disposed, the overcoat resists 44 and 48 and the adhesive 45 are in a state of being released by holes or the like, as in the case of the first embodiment.

  The adhesive 45 is bonded to the overcoat resist 48 disposed on the upper side, and the substrates 21 and 31 are bonded and fixed in an opposing state.

  Since the material of each layer constituting the outer peripheral portion is the same as that of the first embodiment, detailed description thereof is omitted.

  The FPC 40 is heat-sealed and attached to the end portions of the wiring patterns 42A and 46B collected at the front center position in the cutout 31A.

  At this time, since the upper surface of the FPC 40 is in an exposed state, it is the same as in the first embodiment that the heat seal condition can be easily set and can be mounted with good workability.

  In addition, it is good also as a structure which arrange | positions an adhesive on the lower surface of the overcoat resist 48 located on the upper side, and adhere | attaches between adhesives, In this case, the thing of a more reliable adhesion state can be obtained easily. It becomes possible, and it becomes more reliable.

  The touch panel according to the present embodiment configured in this way effectively utilizes the front portion where the FPC 40 that needs to be configured with a predetermined wide width is used in any case, and has an outer peripheral portion that bonds the substrates 21 and 31 to each other. The width dimension of the other part excluding the front side part can be narrowed, and the operation area can be widened with good area efficiency.

  Also in this configuration, since the frame-shaped outer peripheral portion includes the insulating layers 43 and 47 for level difference correction, even if the outer peripheral width is narrow, the bonding state between the substrates 21 and 31 A stable touch panel with excellent surface smoothness and environmental resistance can be realized.

  The operation and manufacturing method according to the present embodiment are almost the same as those according to the first embodiment, and a description thereof will be omitted.

  The touch panel according to the second embodiment has an actual use size of 7 inch liquid crystal (about 170 mm × 110 mm) and before the FPC 40 and the electrical connection conductor 49 are arranged. The width of the outer peripheral portion of the side is 4 to 8 mm, the width of the other side is 1.5 to 4 mm, the size of the electrical connection conductor 49 is 1 to 1.5 mm square, and the width of the adhesive 45 is the width of the electrical connection conductor 49. When it is 4 to 8 mm according to the width of the front side of a certain outer peripheral part, it is left for 2000 hours or more in a high temperature and high humidity environment of 60 ° C. and 95% RH, a high temperature environment of 95 ° C., and a low temperature environment of −40 ° C. As a heat cycle condition, after moving 2000 cycles with -40 ° C. for 0.5 hours and 85 ° C. for 0.5 hours as one cycle, and confirming, resistance between terminals of touch panel, linearity etc Without deterioration of the main electrical characteristics, surface smoothness even substantially maintaining the initial state, deterioration of the appearance or on dignity that there was no occurring.

  Similar results were obtained for a 10-15 inch liquid crystal size.

  The substrates 21 and 31 and the layers constituting the outer peripheral portion can be made of the same material as that of the first embodiment, and an etching process or the like is performed so as to leave only a necessary portion of the transparent conductive film. Further, the electrode arrangement state may be arranged in the positional relationship described in the first embodiment.

(Embodiment 3)
The third embodiment of the present invention, particularly, the inventions described in claims 4 and 5 will be described.

  FIG. 8 is a top view of a touch panel according to a third embodiment of the present invention, and FIG. 9 is an exploded perspective view thereof.

  As shown in the figure, the touch panel according to the present embodiment is different from that according to the second embodiment in the installation state of the FPC 52, and the same components as those in the second embodiment are the same. Reference numerals are assigned and explanations thereof are omitted.

  In the figure, reference numeral 51 denotes a second transparent substrate made of polyethylene terephthalate having a second transparent conductive film 53 formed on the entire lower surface and a hard coat layer 54 formed on the entire upper surface. The first portion of the first transparent substrate 21 is overlapped with the first transparent conductive film 22 and fixed to the first transparent substrate 21 so that the predetermined portion overlaps the first portion. It is arranged facing the transparent substrate 21.

  According to the second embodiment, the substrates 21 and 51 are stably bonded and fixed at a frame-shaped outer peripheral portion including insulating layers 43 and 47 for uniform film thickness. The same.

  The wiring pattern routed state on the outer peripheral portion is different from that of the second embodiment.

  That is, as shown in FIG. 9, the undercoat resist 41B disposed at the front edge portion position on the first transparent substrate 21 has a wiring pattern extending from the electrodes 42 disposed at the left and right side edge portions. Only 42A is routed, and the two wiring patterns 42A are collected at the front center position of the first transparent substrate 21, and the end portions thereof are led out toward the front side end portions.

  Also, the wiring patterns 46C extending from the electrodes 46 disposed at the front and rear sides of the second transparent substrate 51 are routed on the undercoat resist 41C and collected at the front center position on the second transparent substrate 51. The end portion is led out toward the front side end portion.

  The FPC 52 is of a so-called double-sided board type, has wiring portions on the upper and lower surfaces, and is electrically connected to the wiring patterns 46C and 42A, respectively.

  Note that the overcoat resists 44 and 48 and the adhesive 45 are configured such that at least a portion corresponding to the wiring portion position of the FPC 52 is escaped.

  Moreover, since the thing of the said structure is a structure which does not require an electrical connection conductor, it does not need to provide the hole for releasing an electrical connection conductor in the overcoat resists 44 and 48 and the adhesive 45, Pattern formation can be facilitated, and only the wiring patterns 46C and 42A need only be arranged on the upper and lower sides at the front side position of the outer peripheral portion, so that the width dimension of the front portion of the outer peripheral portion can be made narrower than that of the second embodiment. Further, it is possible to further reduce the space of the frame-shaped outer peripheral portion.

  Even in the case of the configuration, the adhesive frame 45 is disposed on the outer peripheral portion where the insulating layers 43 and 47 are formed and the level difference is corrected, so that the substrates 21 and 51 are bonded and fixed. However, reliability can be secured.

  In the present embodiment, since the notch for installing the FPC 52 is not provided in the second transparent substrate 51, the first transparent substrate 21 and the second transparent substrate 51 are bonded so as to sandwich the FPC 52. In this case, the heat seal condition management and workability are slightly inferior to those of the first and second embodiments, but the crimped portion of the FPC 52 can be completely protected by both substrates 21 and 51. Since the substrates 21 and 51 that are in a stable adhesive fixing state are sandwiched, the mounting state of the FPC 52 is easily stabilized.

  In particular, in the second transparent substrate 51, since the second transparent conductive film 53 disposed on the entire surface remains rectangular, the electrode 46 does not necessarily have to be disposed at the front and rear side positions. In addition, the effect of increasing the degree of design freedom can be obtained.

  In the configuration in which the FPC 52 is sandwiched, the thicknesses of the undercoat resists 41B and 41C corresponding to the FPC 52 installation range and the insulating layer 47 for uniform film thickness can be set in consideration of the thickness of the FPC 52. preferable.

  The actual use size according to the present embodiment is a size that is mounted on a 7-inch liquid crystal (about 170 mm × 110 mm), and the width of the outer peripheral portion on the front side where the FPC 52 is installed is narrow. Even when framed 3-4mm and width of other side is 1.5-3mm, under high temperature high humidity environment of 60 ° C 95% RH, high temperature environment of 95 ° C, low temperature environment of -40 ° C Each of the following was allowed to stand for 2000 hours or more, or, as heat cycle conditions, after moving between atmospheres at −40 ° C. for 0.5 hours and at 85 ° C. for 0.5 hours as one cycle, it was confirmed that the touch panel was touched. No major electrical characteristics such as inter-terminal resistance value and linearity were deteriorated, and the surface smoothness was almost maintained at the initial state, and there was no deterioration in appearance or quality.

  Note that the structure in which the FPC is sandwiched and protected between the upper and lower substrates according to this embodiment can also be applied to the first and second embodiments.

(Embodiment 4)
A fourth embodiment of the present invention, particularly the invention described in claim 6, will be described.

  In this embodiment, the optical characteristics of the second embodiment are improved. The same components as those of the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 10 is a top view of a touch panel according to the fourth embodiment of the present invention, and FIG. 11 is a cross-sectional view taken along line AA of FIG.

  In the figure, reference numeral 61 denotes a second transparent substrate made of a polycarbonate film manufactured by a casting method having a thickness of 100 μm, and a second transparent conductive film 32 made of ITO is formed on the entire lower surface of the second transparent substrate 61. The first transparent substrate 21 is bonded to the transparent conductive film 22 at a frame-shaped outer peripheral portion so as to be in an insulating state maintaining an interval of about 50 to 300 μm.

  The second transparent substrate 61 is provided with a notch 61A, and the FPC 40 is mounted on the first transparent substrate 21 with the upper surface exposed in the region, as in the second embodiment.

  A quarter-wave retardation plate 62 and a polarizing plate 63 are laminated and integrated on the upper surface of the second transparent substrate 61. The upper surface of the polarizing plate 63 is generated during operation with a pen or a finger. A hard coat layer 64 made of acrylic resin and having a pencil hardness of 3H is provided to protect scratches and the like that are easily damaged.

  On the other hand, on the lower surface of the first transparent substrate 21 made of soda glass, a 1 / 4λ phase difference plate 62 and a 1 / 4λ phase difference plate 65 whose axial angle is changed by 90 ° are bonded.

  Since the components other than the above are the same as those in the second embodiment, the description thereof is omitted, but also in this configuration, the frame-shaped outer peripheral portion that bonds the substrates 21 and 61 in an opposing state is An insulating layer 47 for level difference correction for equalizing the film thickness (the insulating layer 43 that performs the same function is not shown) is configured, and the two substrates 21 and 61 are in a stable adhesively fixed state. It has become.

  The touch panel configured as described above is allowed to stand for 1000 hours or more in a high temperature and high humidity environment of 60 ° C. and 95% RH, in a high temperature environment of 95 ° C. and in a low temperature environment of −40 ° C., or under heat cycle conditions. As a result, it was confirmed that the movement between atmospheres at −40 ° C. for 0.5 hours and 85 ° C. for 0.5 hours was left as 1000 cycles, and then the main electrical characteristics such as resistance value between terminals of touch panel and linearity were confirmed. The surface smoothness was almost the same as the initial state, and it was of high quality with no appearance or quality deterioration.

  In addition, according to the present embodiment, a 1 / 4λ phase difference plate 62 and a polarizing plate 63 are stacked above the second transparent substrate 61, and a 1 / 4λ phase difference is formed on the lower surface of the first transparent substrate 21. Since the plate 65 is provided, the light reflection at the substrate interface of the touch panel can be reduced, and the reflectance of about 13% in the second embodiment can be reduced to about 5%.

  According to the present embodiment, the second transparent substrate 61 on which the ¼λ phase difference plate 62 and the polarizing plate 63 are bonded together is bonded and fixed to the first transparent substrate 21 with high adhesive strength at the outer periphery. Therefore, even if the quarter-wave retardation plate 62 and the polarizing plate 63 are warped, the degree of influence is reduced.

  The second transparent substrate 61 may be a polycarbonate film formed by a casting method, or a film having a small optical phase difference, such as a polyolefin film (Arton manufactured by JSR Corporation), a polyarylate film, or the like. Is practically 0.01 to 0.4 mm, preferably 0.025 to 0.2 mm.

  As the first transparent substrate 21, a film having a small optical retardation, for example, a polycarbonate film, a polyolefin film, a polyarylate film, etc. by the above casting method can be used in addition to soda glass. A thickness of 1 to 10 mm, preferably 0.15 to 3 mm is practical.

  Further, the ¼λ phase difference plate 62 and the polarizing plate 63 attached to the upper surface of the second transparent substrate 61 are not necessarily the same size as the second transparent substrate 61, and are large enough to cover the operation area of the touch panel. I just need it.

  Similarly, the quarter-wave retardation plate 65 attached to the lower surface of the first transparent substrate 21 only needs to have a size that can cover the operation area of the touch panel.

  The quarter-wave retardation plate 65 to be attached to the lower surface of the first transparent substrate 21 is not attached to the lower surface of the first transparent substrate 21, but is attached to the upper surface of a liquid crystal display element or an organic EL element disposed on the lower surface of the touch panel. It may be.

  Alternatively, the quarter-wave retardation plates 62 and 65 may be removed, and only the polarizing plate 63 may be attached on the second transparent substrate 61.

  In this case, the reflectance is about 9%, which is inferior to that of the case where the phase difference plates 62 and 65 are provided, but it is possible to provide an inexpensive one having a reduced reflectance compared to that of the second embodiment.

  Even if a circularly polarizing plate is used, the same effect as described above can be obtained.

(Embodiment 5)
Hereinafter, the fifth aspect of the present invention will be described with reference to the fifth embodiment.

  FIG. 12 is an exploded perspective view of a car navigation liquid crystal monitor as an electronic apparatus according to a fifth embodiment of the present invention. In FIG. 12, reference numeral 71 denotes the configuration according to the first embodiment arranged on the lower surface of the upper case 72. 7-inch type touch panel, 73 is a 7-inch liquid crystal display device disposed under the touch panel 71, 74 is disposed under the liquid crystal display device 73, and is composed of electronic components such as a central processing unit and a storage element. This is a monitor control circuit unit.

  Each of these members is housed and held in a predetermined positional relationship inside the space formed by the upper case 72 and the lower case 75, and the FPC 77 led out from each side of the touch panel 71 and the liquid crystal display device 73. 78 are respectively connected to connectors arranged in the monitor control circuit unit 74.

  Reference numeral 76 denotes a car navigation control system main body connected to the monitor control circuit unit 74.

  Thus, the car navigation system as an electronic apparatus according to the present embodiment is configured.

  The operation is performed by pressing the position on the touch panel 71 corresponding to a desired function display position with a finger or a pen in a state where each operation function is displayed on the liquid crystal display device 73, and the touch panel obtained thereby. The monitor control circuit 74 performs predetermined control based on the coordinate position signal from 71, for example, ON / OFF of the monitor, selection of software, and the function of the selected software are operated. is there.

  Then, the car navigation liquid crystal monitor having the above-described configuration is left in a high-temperature and high-humidity environment of 60 ° C. and 95% RH for 1000 hours, or as a heat cycle condition, at −40 ° C. for 0.5 hours and 85 ° C. for 0.5 hours. When the inter-atmosphere transfer was left as it was for 1000 cycles and confirmed, the operation of the touch panel 71 had no problem, and good operability and reliability of car navigation could be maintained.

  Even when the touch panel 71 has a liquid crystal size exceeding 7 inches, the same result as above was obtained, and an electronic device having high environmental resistance and easy operation was easily obtained.

  The touch panel according to the present invention and an electronic device using the same have an effect of realizing a high-quality touch panel excellent in environmental resistance that can cope with a severe use environment such as in-vehicle use and an electronic device using the touch panel. In addition, it is attached to the display surface of a liquid crystal display device, etc., and is useful for touch panels that constitute an input operation unit that can input coordinate positions by pressing with a pen or a finger corresponding to the display contents, and various electronic devices using the same. It is.

Top view of the touch panel according to the first embodiment of the present invention. Exploded perspective view Sectional view in the AA line of FIG. Top view of the touch panel according to the second embodiment of the present invention Exploded perspective view Sectional view in the AA line of FIG. Sectional drawing in the BB line of FIG. Top view of a touch panel according to a third embodiment of the present invention Exploded perspective view The top view of the touch panel by the 4th Embodiment of this invention Sectional view in the AA line of FIG. The disassembled perspective view of the car navigation liquid crystal monitor as an electronic device by the 5th Embodiment of this invention Top view of a conventional touch panel Exploded perspective view Sectional drawing in the AA line of the same FIG. It is sectional drawing in the AA line of the same figure, and is a figure which shows the state of insufficient adhesion

Explanation of symbols

20 dot spacer 21 first transparent substrate 22 first transparent conductive film 23, 41A, 41B, 41C undercoat resist 24, 30, 42, 46 electrode 24A, 25A, 42A, 46A, 46B, 46C wiring pattern 26, 49 electrical Connection conductor 27, 43, 47 Insulating layer 28, 44, 48 Overcoat resist 29, 45 Adhesive 31, 51, 61 Second transparent substrate 31A, 61A Notch 32, 53 Second transparent conductive film 33, 54, 64 Hard Coat layer 40, 52, 77, 78 Flexible wiring board 62, 65 Phase difference plate 63 Polarizing plate 71 Touch panel 72 Upper case 73 Liquid crystal display device 74 Monitor control circuit part 75 Lower case 76 Car navigation control system main body

Claims (7)

The first transparent substrate having the first transparent conductive film formed on the upper surface, the second transparent substrate having the second transparent conductive film formed on the lower surface, and the conductive films facing each other with a predetermined gap therebetween. It consists of a frame-shaped outer peripheral part that bonds between each transparent substrate, and includes an insulating layer for level difference correction in the outer peripheral part, and the adhesive layer disposed at a uniform height position where the level difference is corrected by the insulating layer. A touch panel with substrates bonded together. A flexible wiring board (hereinafter referred to as an FPC) for connecting an external device is connected to one side of either the first transparent substrate or the second transparent substrate, and the outer shape of the FPC is escaped from the substrate on which the FPC is not installed. The touch panel according to claim 1, further comprising a cutout for forming a transparent conductive film of the substrate on the side having the cutout and the opposite side. An FPC for connecting an external device is connected to one side of either the first transparent substrate or the second transparent substrate, and is electrically connected to the electrode of the transparent conductive film of the other side substrate only on one side to which the FPC is connected. The touch panel according to claim 1, wherein an electrical connection conductor to be connected is installed. The touch panel as set forth in claim 1, wherein an FPC for connecting an external device is interposed between the first transparent substrate and the second transparent substrate. The FPC for connecting an external device is a double-sided board type, and is sandwiched and installed between the first transparent board and the second transparent board, and each of the wiring portions arranged on both sides of the FPC is transparent to each board. The touch panel according to claim 1, wherein wiring patterns derived from the electrodes of the conductive film are electrically connected to each other. The touch panel according to claim 1, wherein a polarizing plate or a circularly polarizing plate is disposed on the second transparent substrate. An electronic device in which the touch panel according to claim 1 is disposed on a display surface side of a display device, and a predetermined signal obtained by operating the touch panel is determined by a control circuit unit to operate a predetermined function.

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