JP4593198B2 - Touch panel and method for manufacturing touch panel - Google Patents

Description

  The present invention relates to a touch panel, and more particularly to a thin and small display device integrated touch panel capable of detecting a high-resolution position and a manufacturing method thereof.

  A touch panel is one of input devices for information equipment, and has been widely used for display devices such as displays of ATMs (automated teller machines) in banks, and can compactly combine an image display portion and an input portion. Therefore, it is also used in portable devices such as PDAs that require space saving.

  Such a touch panel is usually arranged so as to overlap with a display device such as an LCD or an EL. When the touch panel is touched with a finger or a pen, the contact is converted into an electric signal, and the contact position (coordinate position) is detected. Such contact position detection methods include a resistive film method, a capacitance method, an electromagnetic induction method, and an ultrasonic surface acoustic wave (SAW) method.

  Among these, the resistive film type touch panel has a structure in which a spacer is provided between the glass substrate and the transparent film to provide a gap, and an electric circuit is wired in both the X and Y directions of the gap. Then, when the transparent film is touched with a finger or a pen, the film and the electrode on the substrate surface come into contact with each other due to the pressure, and a current flows, and the partial pressure ratio due to the resistance of the transparent electrode provided on the substrate surface and the film surface is measured. Thus, the contact position is detected. Patent Documents 1 and 2 disclose such a resistive film type display device integrated touch panel.

By the way, with the colorization and high performance of the display means of the portable information communication terminal, it is required to increase the light transmittance and lower the reflectance of the touch panel. Since it is composed of a plurality of layers such as a transparent film / air layer / glass substrate, light is scattered through each of these layers while its transmittance is about 82%. Even if the surface of each layer is coated to prevent such a decrease in transmittance, the transmittance is improved only to about 86%.
JP 2003-243170 A JP 2003-296032 A JP 2002-366303 A JP 2002-342027 A

  On the other hand, in the SAW method, the contact position is detected by detecting a strain (ultrasonic wave) when the touch panel is pressed by using a piezoelectric thin film transducer that generates surface acoustic waves. That is, surface acoustic waves traveling on the glass surface due to vibrations generated from the transmitting transducer are finally transmitted to the receiving transducer, but when the surface of the glass that is the surface acoustic wave transmitting surface is touched with a finger or the like, The vibration of the part is absorbed by the finger or the like by the pressure, and a position where energy is not transmitted from the transmission at a time ratio (that is, a contact position) is detected.

  In general, in a configuration in which a touch panel is placed on a display device, both a display device substrate and a touch panel substrate are required. However, using a plurality of substrates is an obstacle to thinning and downsizing. In addition, there is a problem that the display screen when viewed through the touch panel becomes dark because the interface reflection of each substrate lowers the light transmittance from the display device. However, in the SAW method, the touch panel substrate is a single plate. Therefore, there is an advantage that a bright panel through which light can easily pass is obtained, and a touch panel having a transmittance of 98% has been developed. Patent Documents 3 and 4 disclose such a SAW-type display device integrated touch panel.

  However, the SAW-type display device integrated touch panel described in Patent Document 3 is formed by etching a reflector provided continuously in a peripheral region (frame region) on one main surface of the substrate, and the outside of the reflector. The transducers are arranged at the four corners of the substrate. For this reason, there is a problem that it is difficult to reduce the thickness of the transducer part and there is a limit to the reduction in the size of the substrate.

  In addition, the SAW-type display device integrated touch panel described in Patent Document 4 includes transducers arranged in an array along one long side and one short side of one main surface of a rectangular substrate. Surface acoustic waves are transmitted, and the surface acoustic waves are received by transducers arranged in an array along the long and short sides facing these sides. When the transducers are arranged in this way, the resolution of contact position detection is determined by the width of the transducers arranged on each side, and there is a problem that it is difficult to increase the resolution of contact position detection.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a thin and small touch panel integrated with a display device capable of detecting a high-resolution position and a manufacturing method thereof.

In order to solve this problem, the present invention provides a touch panel, which is a touch panel provided on one main surface of a single non-piezoelectric substrate and the other of the non-piezoelectric substrates. An organic EL display unit provided on a main surface, and the SAW touch panel includes a transmitting transducer for exciting a surface acoustic wave and a receiving transducer for receiving the surface acoustic wave at a peripheral portion of the non-piezoelectric substrate. And detecting a contact position on one main surface of the non-piezoelectric substrate based on a reception result of the surface acoustic wave propagating from the excitation element to the reception element at the reception element. Each of the receiving transducers includes a "<"-shaped comb-shaped electrode provided on one main surface of the thin film piezoelectric body and a flat plate electrode provided on the other main surface, the comb-shaped electrode being in front It is successively arranged along the periphery of the non-piezoelectric substrate, wherein a partial area of the peripheral portion of the non-piezoelectric substrate, provided the first terminal portion is aggregated for connecting the said SAW touch the organic EL display unit And a second terminal portion for connecting to an external device is provided collectively in another partial region of the peripheral portion of the non-piezoelectric substrate, and the first terminal portion is provided on one main surface of the non-piezoelectric substrate. And the second terminal portion is provided on the other main surface of the non-piezoelectric substrate .

  According to a second aspect of the present invention, in the touch panel according to the first aspect, the thin film piezoelectric body is AlN or ZnO.

  A third aspect of the present invention is the touch panel according to the first or second aspect, wherein the organic EL display unit is provided on a transparent electrode and driven by a thin film transistor, wherein red (R), green (G), And a blue (B) full-color display portion in which one pixel is composed of three regions emitting light of each color.

  According to a fourth aspect of the present invention, in the touch panel according to the third aspect, the constituent member of the light emitting region is a light emitting polymer.

The invention according to claim 5 is the touch panel according to any one of claims 1 to 4, wherein the first terminal portion is the same on one main surface of the non-piezoelectric substrate and the other main surface of the non-piezoelectric substrate. It has an anisotropic conductive member which is provided in a field and which connects the 1st terminal part provided in the above-mentioned one principal surface, and the 1st terminal part provided in the above-mentioned other principal surface .

A sixth aspect of the present invention is the touch panel according to the fifth aspect, wherein the second terminal portion is a terminal to be connected to a flexible substrate or a flexible cable .

  The invention described in claim 7 is the touch panel according to any one of claims 1 to 6, wherein the non-piezoelectric substrate is a glass plate, a quartz plate, or a hard plastic plate.

  The invention described in claim 8 is the touch panel according to any one of claims 3 to 7, wherein the constituent material of the transparent electrode is ITO or a transparent conductive polymer material.

  The invention according to claim 9 is the touch panel according to any one of claims 3 to 8, wherein the constituent material of the thin film transistor is a polymer material.

According to a tenth aspect of the present invention, in the touch panel manufacturing method, a first step of forming a SAW touch panel on one main surface of a single non-piezoelectric substrate, and an organic EL display unit on the other main surface of the non-piezoelectric substrate. And forming a transmitting transducer for exciting the surface acoustic wave and a receiving transducer for receiving the surface acoustic wave at the periphery of the non-piezoelectric substrate. The sub-step comprising: forming a short-circuit electrode pattern on a predetermined region of the surface of the non-piezoelectric substrate; forming and patterning a piezoelectric body on the short-circuit electrode pattern; a step of forming the interdigital transducer on the piezoelectric element, and forming the bus electrode connected to the comb-shaped electrodes, the peripheral of the non-piezoelectric substrate Connecting the first terminal portions provided in the same region of the one main surface of the non-piezoelectric substrate and the other main surface of the non-piezoelectric substrate using an anisotropic conductive member; and Connecting a second terminal portion, which is aggregated in another partial region of the peripheral portion of the non-piezoelectric substrate and provided on the other main surface of the non-piezoelectric substrate, with a flexible substrate or a flexible cable . It is characterized by that.

  According to an eleventh aspect of the present invention, in the touch panel manufacturing method according to the tenth aspect, the second step includes a step of forming a transparent electrode pattern in a predetermined region on the back surface of the non-piezoelectric substrate. Features.

  A twelfth aspect of the present invention is the touch panel manufacturing method according to the tenth or eleventh aspect, wherein the second step is to form a thin film transistor for driving the organic EL display section in a predetermined back surface area of the non-piezoelectric substrate. It is characterized by having a step to do.

  A thirteenth aspect of the present invention is the touch panel manufacturing method according to any one of the tenth to twelfth aspects, wherein the second step is performed by any one of an ink jet method, a stamping method, and a screen printing method. It is characterized by being.

  The invention described in claim 14 is the method for manufacturing a touch panel according to any one of claims 11 to 13, wherein the formation temperature of the transparent electrode pattern is 250 ° C. or less.

  According to a fifteenth aspect of the present invention, in the touch panel manufacturing method according to the fourteenth aspect, the transparent electrode pattern is formed of a transparent conductive polymer material, and the transparent conductive polymer material is dried at 130 to 140 ° C. It is characterized by that.

  According to a sixteenth aspect of the present invention, in the touch panel manufacturing method according to any one of the twelfth to fifteenth aspects, the formation temperature of the thin film transistor is 250 ° C. or lower.

  According to a seventeenth aspect of the present invention, in the touch panel manufacturing method according to any one of the tenth to sixteenth aspects, prior to the second step, a third protective film is provided to protect the surface of the SAW touch panel. It is characterized by comprising the following steps.

  According to an eighteenth aspect of the present invention, in the touch panel manufacturing method according to the seventeenth aspect, the protective film is a strip mask.

  According to the present invention, since the display device and the touch panel are formed on the same substrate, it is possible to provide a thin and small display device integrated touch panel capable of detecting a high resolution position.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  1 and 2 are a schematic plan view (FIG. 1) and a schematic cross-sectional view (FIG. 2) along AA in FIG. 1 for explaining the configuration of the display device-integrated touch panel of the present invention. Referring to FIGS. 1 and 2, one main surface (surface) of the glass substrate 1 has transmission transducers 2a and 2b extending in the X-axis direction on the surface and a receiving transducer 3a extending in the Y-axis direction. 3b, and an organic EL display unit (OELD) 4 is integrally formed on the other main surface (back surface) of the glass substrate 1 to form a display device integrated touch panel. A region surrounded by a frame region where a transducer on the surface of the glass substrate 1 is formed becomes a contact position detection region. The substrate need not be a glass substrate as long as it is a rectangular non-piezoelectric substrate capable of propagating surface acoustic waves, and may be a quartz plate or a hard plastic plate.

  The transmitting transducers 2a and 2b convert electrical signals into SAWs, and the receiving transducers 3a and 3b convert SAWs into electrical signals. These transmitting transducers 2a and 2b and receiving transducers 3a and 3b are configured by forming a comb-shaped electrode on one main surface of a thin film piezoelectric body made of, for example, AlN or ZnO and forming a flat solid electrode on the other main surface. That is, each of the transducers 2a, 2b, 3a, and 3b has an SPT (Single Phase Transducer) electrode structure in which a piezoelectric thin film is sandwiched between an electrode and a unipolar comb-shaped electrode. It is a chevron type electrode configuration arranged continuously. With such an electrode configuration, only one electrical wiring needs to be provided in the same plane.

  When an AC voltage signal is applied between the comb-shaped electrode and the flat plate electrode included in the transmitting transducers 2a and 2b, the excited surface acoustic waves are converted into two pairs of the glass substrate 1 as shown in FIG. Propagated in the angular direction and received by the piezoelectric elements provided in the receiving transducers 3a and 3b.

FIG. 3 is a diagram for explaining the principle of contact position detection in such a SAW touch panel. For example, when a drive signal is output at time t = t ₀ and a SAW is emitted from the transmission transducers 2a and 2b, In the SAW, surface acoustic waves travel on the surface of the glass substrate 1 and are finally transmitted to the receiving transducers 3a and 3b to be converted into electric signals. At this time, if a specific position on the surface of the glass substrate 1 is touched with a finger or a pen, the vibration (energy) of the contact portion is absorbed by the finger or the pen, so that it is recognized as a lack of signal due to the contact. . From the time difference (Δt = t ₁ −t ₀ ) with respect to the time (t = t ₁ ) when the signal is lost (t = t ₁ ) and the output time (t = t ₀ ) of the drive signal, the surface of the glass substrate 1 where the SAW energy has not been transmitted The coordinate position (that is, the contact position) is detected.

  FIG. 4 is a schematic cross-sectional view for explaining a pixel configuration of the organic EL display unit 4 provided in the display device-integrated touch panel of the present invention. In this figure, a region of a single pixel composed of three light emitting regions of blue (B), green (G), and red (R) is shown.

  The pixels of the organic EL display unit 4 are periodically arranged in the back region corresponding to the contact position detection region on the surface of the glass substrate 1. In the single pixel formation region, for example, a glass layer 5 is provided as an undercoat layer. On the glass layer 5, for example, a polysilicon layer in which a channel and source / drain are formed, or the like. A top gate type thin film transistor (hereinafter referred to as TFT) 6 is provided which is formed by sequentially stacking a semiconductor layer, a gate insulating film, and a gate electrode.

  A contact hole 8 is formed in the transparent electrode layer 7 a such as ITO and the interlayer insulating layer 7 b, and the anode 9 is electrically connected to the source / drain of the TFT 6 through the contact hole 8. An organic light emitting layer (light emitting polymer layer) 10 corresponding to each of blue, green, and red pixels is provided on the anode 9 exposed between the interlayer insulating layers 7b. The organic light emitting layer 10 may include a conductive organic material layer for injecting holes from the anode 9 to the organic light emitting layer 10. These pixels are separated from each other by an inter-pixel insulating wall 11, and a reflective electrode 12 is formed on the upper surface to constitute one pixel.

  The comb electrode and the plate electrode included in the transducer are connected to an external circuit such as an oscillation circuit or a reception level detection circuit, and a flexible substrate (FPC) or a flexible cable is preferably used for the connection. The display device integrated touch panel of the present invention has a structure in which a predetermined material is laminated on the surface of a single glass substrate to configure the touch panel. Therefore, the connection terminals can be easily arranged at any position, Can be collected in part.

  FIG. 5A is a schematic cross-sectional view for explaining a state in which a flexible substrate or the like is connected to the display device integrated touch panel of the present invention. FIG. 5B and FIG. Of the wiring pattern connection pads 18 provided on the surface of the touch panel side and the wiring pattern connection pads 19 and the FPC connection pads 20 provided on the surface of the glass substrate 1 on the organic EL display side. It shows a state.

  Referring to FIG. 5A, the FPC 21 is connected to the FPC connection pad 20 provided in one end region of the surface of the glass substrate 1 on the organic EL display portion side, and is provided at the other end facing the FPC connection pad 20. The connecting pads 18 and 19 are fixed to the glass substrate holding member 22 in an electrically connected state via the anisotropic conductive member 23.

  That is, the FPC connection pads 20 provided on the surface of the glass substrate 1 on the side of the organic EL display unit are provided on one side of the frame area, thereby enabling electrical connection with an external device in a narrow space. . Similarly, both the connection pad 18 provided on the surface on the touch panel side and the connection pad 19 provided on the surface on the organic EL display unit side correspond to the front and back surfaces of one frame region of the glass substrate 1. Therefore, the space required for electrical connection is extremely narrow and the arrangement is sufficient.

Usually, since there are eight touch panel connection terminals, the eight connection pads 18 arranged near the end of the touch panel side surface of the glass substrate 1 are different from the eight connection pads 19 formed on the back surface. If the FPC connection pad 20 and the FPC 21 arranged together on the back surface of the glass substrate 1 are connected using the isotropic conductive member 23, the number of connection with the FPC 21 can be reduced to one.

  The display device-integrated touch panel of the present invention can be manufactured as follows.

  FIG. 6 is a process conceptual diagram for explaining an example of the manufacturing process of the display device-integrated touch panel of the present invention. First, a glass substrate 1 (TFT-formed glass substrate) in which TFTs (not shown) are formed in advance on each pixel formation region on the back surface of the glass substrate 1 is prepared, and ITO is formed on the back surface thereof as a transparent electrode layer 7a (step) S101). An aluminum layer 13 is formed by sputtering on the surface of the glass substrate 1 (step S102), and a short-circuit electrode pattern is formed by photolithography and etching (step S103). Subsequently, a ZnO film 14 that is a piezoelectric material is formed by sputtering on the surface of the glass substrate 1 (step S104), and this is processed by photolithography and etching so that only the ZnO film 14 on the short-circuit electrode pattern remains. A piezoelectric pattern is formed (step S105).

  A comb-shaped electrode 15 is formed on the piezoelectric pattern by screen printing (step S106), and the bus electrode 16a is formed at a predetermined position of the comb-shaped electrode 15 and a predetermined position on the glass substrate 1 adjacent to the comb-shaped electrode 15. 16b is formed by screen printing (step S107). A SAW touch panel is produced on the surface of the glass substrate 1 by the series of steps S102 to S107.

  Following the production of the SAW touch panel, an inter-pixel insulating wall 11 is formed on the transparent electrode layer 7a on the back surface of the glass substrate 1 to separate each pixel by screen printing (step S108). A hole injection layer 17 is provided by ink jet printing in the pixel formation region defined by the wall 11 (step S109), and a light emitting polymer that emits blue, green, and red light is further ink jet printed on the hole injection layer 17 ( Alternatively, the organic light-emitting layer 10 is formed by coating by stamping or the like (step S110). Finally, the reflective electrode 11 as the cathode layer is screen-printed to complete the organic EL display unit (step S111).

  Preferably, the SAW touch panel surface is covered with a protective film or the like in order to prevent the SAW touch panel from being scratched or soiled prior to the organic EL display section manufacturing process after step S108. As the protective film in this case, an adhesive film having a relatively weak adhesive force, a film obtained by printing and drying a strip mask, or the like can be used.

  Further, in the above manufacturing process example, the ITO film is formed prior to the formation of the ZnO which is the piezoelectric material, but the order of these film formations may be reversed. That is, after the SAW touch panel is manufactured on the surface of the glass substrate 1 by the procedure of steps S102 to S107, a transparent electrode pattern is formed with a material such as ITO at a position corresponding to the pixel formation region on the back surface of the glass substrate 1. Also good. In this case, the transparent electrode pattern is formed at a low temperature of 250 ° C. or lower in order to prevent the already formed transducer from being exposed to a high temperature to deteriorate the SAW transmission / reception characteristics. Further, instead of ITO, the transparent electrode pattern may be formed using a transparent conductive polymer that can be processed at a low temperature. In this case, the transparent conductive polymer material is dried at 130 to 140 ° C., and a transparent electrode pattern can be formed at an extremely low temperature.

  Furthermore, in the manufacturing process example described above, a TFT-formed glass substrate is used as the glass substrate 1. However, TFTs may be formed on the back surface of the bare glass substrate 1 at a low temperature of 250 ° C. or lower. If a polymer material is used as the TFT forming material in this case, there is a merit that low-temperature processing is possible.

  As described above, according to the present invention, since the display device and the touch panel are formed on the same substrate, it is possible to provide a thin and small display device integrated touch panel capable of high-resolution position detection. It becomes possible.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

It is a plane schematic diagram for demonstrating the structure of the display apparatus integrated touch panel of this invention. It is a cross-sectional schematic diagram for demonstrating the structure of the display apparatus integrated touch panel of this invention. It is a figure for demonstrating the principle of the contact position detection in a SAW touch panel. It is a cross-sectional schematic diagram for demonstrating the structure of the organic electroluminescent display part with which the display apparatus integrated touch panel of this invention is provided. It is a figure for demonstrating the state which connected the flexible substrate etc. to the display apparatus integrated touch panel of this invention. It is a process conceptual diagram for demonstrating the manufacturing process of the display apparatus integrated touch panel of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass substrate 2a, 2b Transmitting transducer 3a, 3b Receiving transducer 4 Organic EL display part 5 Glass layer 6 Thin-film transistor 7a Transparent electrode layer 7b Interlayer insulating layer 8 Contact hole 9 Anode 10 Organic light emitting layer 11 Interpixel insulating wall 12 Reflective electrode

Claims (18)

A SAW touch panel provided on one main surface of a single non-piezoelectric substrate, and an organic EL display unit provided on the other main surface of the non-piezoelectric substrate,
The SAW touch panel includes a transmitting transducer for exciting a surface acoustic wave and a receiving transducer for receiving a surface acoustic wave at a peripheral portion of the non-piezoelectric substrate, and the surface elasticity propagating from the excitation element to the receiving element. Detecting a contact position on one main surface of the non-piezoelectric substrate based on a reception result of the wave at the receiving element;
Each of the transmitting and receiving transducers includes a "<"-shaped comb-shaped electrode provided on one main surface of a thin-film piezoelectric body and a flat plate electrode provided on the other main surface. A mold electrode is continuously disposed along the peripheral edge of the non-piezoelectric substrate ;
A first terminal portion for connecting the SAW touch panel and the organic EL display portion is collectively provided in a partial region of the peripheral portion of the non-piezoelectric substrate,
A second terminal portion for connecting to an external device is provided collectively in another partial region of the peripheral portion of the non-piezoelectric substrate,
The first terminal portion is provided on one main surface of the non-piezoelectric substrate and the other main surface of the non-piezoelectric substrate,
The touch panel, wherein the second terminal portion is provided on the other main surface of the non-piezoelectric substrate . The touch panel according to claim 1, wherein the thin film piezoelectric body is AlN or ZnO. The organic EL display unit is provided on a transparent electrode and is driven by a thin film transistor. One pixel is formed by three regions emitting light of each color of red (R), green (G), and blue (B). The touch panel according to claim 1, wherein the touch panel is a configured full-color display unit. The touch panel as set forth in claim 3, wherein the constituent member of the light emitting region is a light emitting polymer. The first terminal portion is provided in the same region of one main surface of the non-piezoelectric substrate and the other main surface of the non-piezoelectric substrate,
5. The anisotropic conductive member for connecting the first terminal portion provided on the one main surface and the first terminal portion provided on the other main surface, respectively. 6. The touch panel as described in Crab. The touch panel as set forth in claim 5, wherein the second terminal portion is a terminal to be connected to a flexible substrate or a flexible cable . The touch panel according to claim 1, wherein the non-piezoelectric substrate is a glass plate, a quartz plate, or a hard plastic plate. The touch panel according to claim 3, wherein the constituent material of the transparent electrode is ITO or a transparent conductive polymer material. 9. The touch panel according to claim 3, wherein the constituent material of the thin film transistor is a polymer material. A first step of forming a SAW touch panel on one main surface of a single non-piezoelectric substrate, and a second step of forming an organic EL display unit on the other main surface of the non-piezoelectric substrate,
The first step includes a sub-step of forming a transmitting transducer for exciting a surface acoustic wave and a receiving transducer for receiving the surface acoustic wave at a peripheral portion of the non-piezoelectric substrate,
The substep is:
Forming a short-circuit electrode pattern on a predetermined region of the surface of the non-piezoelectric substrate;
Forming and patterning a piezoelectric body on the short-circuit electrode pattern; and
Forming a comb electrode on the patterned piezoelectric body;
Forming a bus electrode connected to the comb electrode;
Using the anisotropic conductive member, the first terminal portion that is concentrated on the peripheral portion of the non-piezoelectric substrate and is provided in the same region of the one main surface of the non-piezoelectric substrate and the other main surface of the non-piezoelectric substrate is used. Connecting, and
Connecting a second terminal portion that is aggregated in another partial region of the peripheral portion of the non-piezoelectric substrate and provided on the other main surface of the non-piezoelectric substrate to a flexible substrate or a flexible cable. A method for manufacturing a touch panel, comprising: The touch panel manufacturing method according to claim 10, wherein the second step includes a step of forming a transparent electrode pattern in a predetermined area on the back surface of the non-piezoelectric substrate. 12. The method of manufacturing a touch panel according to claim 10, wherein the second step includes a step of forming a thin film transistor for driving the organic EL display unit in a predetermined back surface region of the non-piezoelectric substrate. . The touch panel manufacturing method according to claim 10, wherein the second step is performed by any one of an inkjet method, a stamping method, and a screen printing method. The method for manufacturing a touch panel according to claim 11, wherein the formation temperature of the transparent electrode pattern is 250 ° C. or less. The method of claim 14, wherein the transparent electrode pattern is formed of a transparent conductive polymer material, and the transparent conductive polymer material is dried at 130 to 140 ° C. The method for manufacturing a touch panel according to claim 12, wherein a formation temperature of the thin film transistor is 250 ° C. or less. The touch panel manufacturing method according to any one of claims 10 to 16, further comprising a third step of applying a protective film for protecting the surface of the SAW touch panel prior to the second step. . The touch panel manufacturing method according to claim 17, wherein the protective film is a strip mask.

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