JP2013148951A - Method for manufacturing projected capacitive touch panel, method for manufacturing touch panel module, projected capacitive touch panel, and touch panel module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a highly reliable projected capacitive touch panel with two-substrate structure capable of decreasing a manufacturing cost compared with the conventional one.SOLUTION: The method for manufacturing a projected capacitive touch panel includes in this order: a substrate preparing step of preparing a fist substrate 10 having a first transparent substrate 12 and a first transparent electrode, and a second substrate 20 having a second transparent substrate 22 and a second transparent electrode; a seal material forming step of forming a seal material 41 for sticking the first transparent substrate 10 and the second transparent substrate 20 at a predetermined first interval apart from each other; a sticking step of sticking the first substrate 10 and the second substrate 20 with the seal material 41; and a fixing step of injecting an optical adhesive 34 between the first substrate 10 and the second substrate using a vacuum injection method, hardening the optical adhesive 34, and fixing the first substrate 10 and the second substrate 20 at the predetermined first interval apart.

Description

  The present invention relates to a method for manufacturing a projected capacitive touch panel, a method for manufacturing a touch panel module, a projected capacitive touch panel, and a touch panel module.

  In recent years, mobile phones, notebook PCs, PC monitors, tablet devices, digital cameras, etc. that have a display-integrated touch panel capable of multi-touch (multi-point recognition) input are rapidly becoming popular. There is a growing interest in playful operations. As a touch panel, a resistive touch panel has been the mainstream before, but currently, a projection capacitive touch panel is widely used particularly in the electronic devices as described above.

In general, the term “touch panel” may refer to the entire display-integrated touch panel, but in this specification refers to the touch panel itself.
Further, a “touch panel module” to be described later refers to a device including the above-mentioned “touch panel” and a “cover lens” that covers the touch panel.

Conventionally, various projected capacitive touch panels are known (see, for example, Patent Document 1). FIG. 7 is a view for explaining a conventional projected capacitive touch panel 900. FIG. 7A is a top view of the projected capacitive touch panel 900, and FIG. 7B is a cross-sectional view of the projected capacitive touch panel 900.
As shown in FIG. 7, a conventional projected capacitive touch panel 900 includes a transparent substrate 910 on which a transparent electrode electrode or the like is mounted, and a first transparent electrode made of a transparent electrode (for example, indium tin oxide (ITO) film). 922 and a first external connection wiring 924, a first insulating layer 930, a second transparent electrode 942 and a second external connection wiring 944, and a second insulating layer 950. Reference numeral 960 denotes a connection portion with the outside (for example, an external drive circuit).

  The projected capacitive touch panel 900 includes a first transparent electrode 922 and a second transparent electrode 942 that are separated by a first insulating layer 930 in order to detect two-dimensional coordinates. The first transparent electrode 922 and the second transparent electrode 942 are for detecting the coordinate in the X-axis direction and the coordinate in the Y-axis direction, respectively, and are formed in stripes orthogonal to each other when seen in a plan view. Yes.

  Here, the principle of the projected capacitive touch panel will be briefly described. When a conductive substance (for example, a finger) is brought close to the vicinity of the transparent electrode, the capacitance between the first transparent electrode and the second transparent electrode at a position close to the conductive substance changes. The projected capacitive touch panel detects a position where a conductive substance has approached by detecting a change in the capacitance.

The projected capacitive touch panel has a first transparent electrode and a second transparent electrode separated by an insulator on one side of one transparent substrate, like the projected capacitive touch panel 900. In addition to (single substrate single-sided structure), one transparent substrate having a first transparent electrode on one surface and a second transparent electrode on the other surface (single-substrate double-sided structure), 2. Description of the Related Art A two-substrate structure in which a first substrate having one transparent electrode and a second substrate having a second transparent electrode are bonded is known.
A glass substrate or a plastic film substrate is used as the transparent substrate. Note that a glass substrate (usually a substrate made of soda lime glass) may have a narrower frame region (a region between the outer end of the region functioning as the touch panel and the outer end of the transparent substrate) than the plastic film substrate. In addition, it is characterized by being easy to handle due to its excellent heat resistance and rigidity.

JP 2011-76386 A

  By the way, when it is going to manufacture the projection capacitive touch panel with a two-substrate structure, two transparent substrates are bonded together with an optical adhesive sheet (OCA) or an optical adhesive (OCR).

  Among these, when using an optical adhesive sheet, the bonding process itself is easy, but bubbles are likely to remain after bonding, resulting in a low yield due to poor appearance and a high manufacturing cost. There is.

On the other hand, when an optical adhesive is used, generally, after the optical adhesive is dropped on one substrate, the bonding step is performed by pressing the other substrate while removing bubbles. For this reason, it can suppress that a yield becomes low by the external appearance defect by a bubble, and can produce a high quality projection capacitive touch panel with a high yield.
However, it is difficult to form a uniform optical adhesive layer after uniformly diffusing or curing the optical adhesive, resulting in high equipment costs and management costs, and eventually high manufacturing costs. is there.

In addition, as an example of the problem regarding apparatus cost, in order to bond a board | substrate by the above methods, the problem that an expensive and complicated specialized apparatus is needed can be mentioned.
In addition, as an example of the problem regarding the management cost, if the amount of the optical adhesive is insufficient, the optical adhesive cannot be spread to the necessary surface, and if the amount of the optical adhesive is excessive, the optical adhesive Can overflow from the end face of the transparent substrate.

  Therefore, at present, particularly in a projection capacitive touch panel using a glass substrate as a transparent substrate, a projection capacitive touch panel having a single-substrate structure (single-substrate single-side structure and single-substrate double-side structure). Compared to that, the commercialization of the projected capacitive touch panel with a two-substrate structure is delayed.

  Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a projected capacitive touch panel having a two-substrate structure that can be manufactured at a lower manufacturing cost than conventional ones. . It is another object of the present invention to provide a method for manufacturing a touch panel module that can be manufactured at a lower cost than conventional ones. It is another object of the present invention to provide a projected capacitive touch panel and a touch panel module that can be manufactured at a lower manufacturing cost than before.

[1] A method for manufacturing a projected capacitive touch panel according to the present invention is a method for manufacturing a projected capacitive touch panel, and is formed on one surface of a first transparent substrate and the first transparent substrate. A substrate preparing step of preparing a first substrate having a first transparent electrode and a second substrate having a second transparent electrode formed on one surface of the second transparent substrate and the second transparent substrate; A sealing material forming step of forming a sealing material for bonding the first substrate and the second substrate to each other surface of the substrate or one surface of the second substrate with a predetermined first interval; A bonding step of bonding the first substrate and the second substrate with the sealing material, and injecting an optical adhesive between the first substrate and the second substrate using a vacuum injection method, The first adhesive is cured by curing the optical adhesive. Characterized in that it comprises a fixing step of fixing the said plate-second substrate in a state in which at a predetermined first interval in this order.

  According to the method for manufacturing a projected capacitive touch panel of the present invention, a sealing material forming step for forming a sealing material for bonding the first substrate and the second substrate with a predetermined first interval; A bonding step of bonding one substrate and a second substrate with a sealing material, and injecting an optical adhesive between the first substrate and the second substrate using a vacuum injection method, and then curing the optical adhesive And a fixing step of fixing the first substrate and the second substrate with a predetermined first gap therebetween in this order. Therefore, by using an optical adhesive, high yield and high quality projected capacitance The touch panel can be manufactured, and the device cost and the management cost can be suppressed by using the vacuum injection method. As a result, the manufacturing cost can be reduced as compared with the conventional method.

  Further, according to the method for manufacturing a projected capacitive touch panel of the present invention, as shown in an experimental example described later, a projected capacitive touch panel that can improve environmental reliability and has high reliability is manufactured. It becomes possible.

  As the vacuum injection method, for example, a method similar to that used when filling a liquid crystal substance between transparent substrates in a manufacturing process of a TFT liquid crystal panel can be used. For this reason, it is possible to prevent overflow due to the shortage or excess of the optical adhesive, and to suppress the management cost, and it is possible to suppress the equipment cost by using the existing equipment.

In the above manufacturing method, it is preferable to use a sealing material containing a gap material for a sealing material having a particle size the same as the predetermined first interval as the sealing material. By adopting such a method, it becomes possible to control the distance between the first substrate and the second substrate with high accuracy. As the gap material for the sealing material, for example, a resin ball or a glass ball can be used.
As the transparent electrode, for example, one made of an indium tin oxide film can be used.

[2] In the method for manufacturing a projected capacitive touch panel according to the present invention, in the substrate preparation step, the first transparent electrode and the second transparent electrode are connected to the outside as the first substrate. A connecting member forming step of preparing a first substrate having wiring and forming a connecting member for connecting the second transparent electrode to the external connecting wire after the substrate preparing step and before the bonding step; It is preferable to include.

  Conventionally, a wiring that connects the first transparent electrode to the outside (for example, an external drive circuit) and a wiring that connects the second transparent electrode to the outside, regardless of whether it is a touch panel having a single substrate structure or a touch panel having a two substrate structure (Refer to the first external connection wiring 924 and the second external connection wiring 944 in the conventional projected capacitive touch panel 900). For this reason, the electrical connection between each transparent electrode and the outside becomes two regions, and a large amount of expensive anisotropic conductive film (ACF) and flexible printed circuit board (FPC) must be used, and the overall material cost is high. There is a problem of becoming. In addition, there is a problem that the cost related to the increase in the connection process and the cost related to the process management due to the increase in the number of connection parts also become a heavy load, and the cost of incorporation increases.

  On the other hand, according to the method for manufacturing a projected capacitive touch panel of the present invention, since the projected capacitive touch panel is manufactured by integrating the external connection wiring on the first substrate side, the material cost and process management are reduced. It is possible to manufacture a projected capacitive touch panel that can be incorporated at a low cost.

  The external connection wiring is preferably made of a transparent electrode similar to the first transparent electrode. In this case, a first substrate in which the first transparent electrode and the external connection wiring are simultaneously formed on the first transparent substrate can be prepared and used.

[3] In the method for manufacturing a projected capacitive touch panel according to the present invention, in the sealing material forming step, the connection member is separated from the first transparent electrode or the second transparent electrode. It is preferable to further form a sealing material.

  By adopting such a method, it is possible to protect the connection member from deterioration caused by the external environment, and it is possible to manufacture a projected capacitive touch panel that can improve environmental reliability.

[4] In the method for manufacturing a projected capacitive touch panel according to the present invention, the connection member includes a conductive paste containing conductive particles having a particle size larger than the predetermined first interval. It is preferable to use a material.

  By adopting such a method, the conductivity of the connecting member is added to the conductivity of the conductive paste in addition to the conductivity of the conductive paste, thereby reducing the overall resistance, stabilizing the initial resistance, and Environmental reliability can be further improved.

As the conductive paste, for example, a silver paste or a carbon paste can be used.
Further, as the conductive particles, for example, anisotropic conductive particles obtained by coating a resin (metal, nickel, gold, etc.) or metal (for example, copper, nickel) particles can be used.

  The optimum value of the size of the conductive particles can be determined depending on the type of the conductive particles to be used. When the size of the predetermined first interval is 100%, the particle size of the conductive particles is 101% to It is preferably in the range of 150%, more preferably in the range of 110% to 130%.

[5] In the method for manufacturing a projected capacitive touch panel according to the present invention, after the substrate preparation step, the conductive member layer for wiring is laminated on at least a portion of the external connection wiring connected to the outside. It is preferable that a conductive member layer lamination step is further included.

  When the transparent electrode and the conductive member layer have a laminated structure, the anisotropic conductive particles in the anisotropic conductive film can take a plurality of conductive paths. Compared with a single-layer structure having only a member layer, it is possible to dramatically improve the connection reliability with the flexible printed circuit board through the anisotropic conductive film.

[6] In the method for manufacturing a projected capacitive touch panel according to the present invention, the fixing step includes a gap material having the same particle size as the predetermined first interval as the optical adhesive. It is preferable to use an optical adhesive.

  By adopting such a method, the interval between the first substrate and the second substrate is more uniform, and it is possible to suppress the occurrence of color unevenness due to the unevenness of the interval when passing light. It is possible to manufacture a projection type capacitive touch panel that can be used.

  For example, a resin ball or a glass ball can be used as the gap material.

[7] In the method for manufacturing a projected capacitive touch panel according to the present invention, in the bonding step, the predetermined first surface of the first substrate or the one surface of the second substrate is formed on the predetermined first surface. It is preferable to bond the first substrate and the second substrate after spraying a gap material having a particle size equal to the size of one interval.

  Even with this method, the distance between the first substrate and the second substrate is more uniform, and color unevenness due to the unevenness of the space when light is transmitted is suppressed. It is possible to manufacture a projected capacitive touch panel that can be used.

  As the gap material, for example, a resin ball or a glass ball can be used as in [6] above.

[8] In the method for manufacturing a projected capacitive touch panel according to the present invention, the thickness reducing step of reducing the thickness of both or one of the first transparent substrate and the second transparent substrate after the fixing step. It is preferable that it is further included.

  By adopting such a method, even a projection capacitive touch panel having a two-substrate configuration can have a thickness equivalent to that of a projection capacitive touch panel having a single-substrate configuration.

  In order to reduce the thickness, for example, grinding or polishing can be performed.

[9] A method for manufacturing a touch panel module according to the present invention includes a touch panel / cover lens preparation step of preparing a projected capacitive touch panel and a cover lens, and the surface of the projected capacitive touch panel or the surface of the cover lens. A cover lens sealing material forming step for forming a cover lens sealing material for bonding the projected capacitive touch panel and the cover lens at a predetermined second interval; Cover lens bonding process for bonding a capacitive touch panel and the cover lens with the cover lens sealing material, and a cover lens between the projected capacitive touch panel and the cover lens using a vacuum injection method After injecting the optical adhesive, the projection is performed by curing the optical adhesive for the cover lens. And a cover lens fixing step of fixing the capacitive touch panel and the cover lens in a state spaced a predetermined second distance, characterized in that it comprises in that order.

  According to the method for manufacturing a touch panel module of the present invention, the cover lens sealing material is formed to form the cover lens sealing material for bonding the projected capacitive touch panel and the cover lens at a predetermined second interval. A cover lens bonding process in which a projection capacitive touch panel and a cover lens are bonded with a cover lens sealing material, and between the projected capacitive touch panel and the cover lens using a vacuum injection method. Cover lens fixing step of fixing the projected capacitive touch panel and the cover lens with a predetermined second interval by injecting the cover lens optical adhesive and then curing the cover lens optical adhesive In this order, the high-quality product with a high yield is obtained in the same manner as the manufacturing method of the projected capacitive touch panel of the present invention. It becomes possible to manufacture a touch panel module, and it is possible to suppress the equipment cost and management cost by using a vacuum injection method, as a result, it is possible to reduce the manufacturing cost than the prior art.

  In the above touch panel module manufacturing method, a projected capacitive touch panel manufactured by the manufacturing method as described in [2] above (a projected capacitive touch panel in which external connection wiring is integrated on the first substrate side). When the touch panel is used, it is preferable to manufacture the touch panel module by bonding the first substrate side of the projected capacitive touch panel and the cover lens. By adopting such a method, it is possible to expose the external connection wiring to the side opposite to the cover lens, and to perform connection with the outside after the manufacturing method of the touch panel module is completed. That is, specifically, it is not necessary to connect a flexible printed circuit board or the like on which an expensive driving IC is mounted first, and even when a defect occurs in the bonding between the projected capacitive touch panel and the cover lens. There is an effect that the flexible printed circuit board or the like is not wasted.

  It is preferable that the projected capacitive touch panel prepared in the touch panel preparation step has a two-substrate configuration. The projection type capacitive touch panel having a two-substrate configuration is easy to bond the cover glass as described above because the transparent electrode is completely sandwiched between the transparent substrates, and the one-substrate configuration. This is because it is less susceptible to noise from the image display unit (for example, LCD panel) than the projected capacitive touch panel, and the operational stability can be increased.

  From the viewpoint that it is possible to lower the manufacturing cost than before, in the touch panel / cover lens preparation step, the projected capacitive touch panel manufactured by the projected capacitive touch panel manufacturing method of the present invention. Alternatively, it is preferable to prepare the projected capacitive touch panel of the present invention.

[10] The projected capacitive touch panel of the present invention includes a first substrate having a first transparent substrate and a first transparent electrode, a second substrate having a second transparent substrate and a second transparent electrode, and the first substrate. An optical adhesive layer for fixing the substrate and the second substrate at a predetermined first interval; and a sealing material layer surrounding the optical adhesive layer, wherein the first substrate is the first transparent An external connection wiring for connecting the electrode and the second transparent electrode to the outside; a connection member for connecting the second transparent electrode to the external connection wiring; and a member surrounding the connection member separately from the sealing material layer And a sealing material layer.

  According to the projected capacitive touch panel of the present invention, the projected capacitive touch panel can be manufactured by the manufacturing method of the projected capacitive touch panel of the present invention, so that it can be manufactured at a lower manufacturing cost than before. Become.

  In addition, according to the projected capacitive touch panel of the present invention, since the external connection wiring is gathered on the first substrate side, it is possible to reduce the material cost, the cost related to the process management, etc., and to incorporate at a low cost. It is possible to manufacture a projection type capacitive touch panel that can be used.

  Furthermore, according to the projected capacitive touch panel of the present invention, since the sealing member layer is provided with another sealing material layer surrounding the connecting member, the connecting member can be protected from deterioration due to the external environment. And environmental reliability can be improved.

[11] In the projected capacitive touch panel of the present invention, it is preferable that the optical adhesive layer contains a gap material having a particle size of the same size as the predetermined first interval.

  By adopting such a configuration, the interval between the first substrate and the second substrate is made more uniform, and color unevenness due to the interval unevenness when light is transmitted is suppressed. Is possible.

  For example, a resin ball or a glass ball can be used as the gap material.

[12] A touch panel module of the present invention is a cover that fixes a projected capacitive touch panel, a cover lens, the projected capacitive touch panel, and the cover lens with a predetermined second interval therebetween. A lens optical adhesive layer and a cover lens sealing material layer surrounding the cover lens optical adhesive layer are provided.

  According to the touch panel module of the present invention, since it can be manufactured by the manufacturing method of the touch panel module of the present invention, it can be manufactured at a lower manufacturing cost than before.

It is a figure shown in order to demonstrate the projection capacitive touch panel 100 which concerns on embodiment. It is a figure shown in order to demonstrate the detail of the projection capacitive touch panel 100 which concerns on embodiment. It is a flowchart of the manufacturing method of the projection capacitive touch panel according to the embodiment. It is a figure shown in order to demonstrate the manufacturing method of the projection capacitive touch panel which concerns on embodiment. It is a figure shown in order to demonstrate the touch panel module 300 which concerns on embodiment. It is a flowchart of the manufacturing method of the touch panel module which concerns on embodiment. It is a figure shown in order to demonstrate the conventional projection type capacitive touch panel 900. FIG.

  Hereinafter, a manufacturing method of a projected capacitive touch panel, a manufacturing method of a touch panel module, a projected capacitive touch panel, and a touch panel module according to the present invention will be described based on the embodiments shown in the drawings.

[Embodiment]
First, the projected capacitive touch panel 100 according to the embodiment will be described.
FIG. 1 is a diagram for explaining a projected capacitive touch panel 100 according to an embodiment. FIG. 1A is a top view of the projected capacitive touch panel 100, and FIG. 1B is a cross-sectional view taken along line A1-A1 of FIG. Note that each drawing including FIG. 1 is a schematic diagram, and the dimensions on the display are appropriately changed for the sake of explanation. Therefore, the size relationship of each component is not necessarily accurate.
Reference numeral 200 in the drawing is an example of a flexible printed circuit board, and the flexible printed circuit board 200 is not a component of the projected capacitive touch panel 100.

  FIG. 2 is a view for explaining details of the projected capacitive touch panel 100 according to the embodiment. 2A is an enlarged view of a portion indicated by B in FIG. 1B, and FIG. 2B is a portion indicated by C in FIG. 1B (a portion containing the gap material 32). 2 (c) is an enlarged view of a portion indicated by D in FIG. 1 (a), and FIG. 2 (d) is an essential part of the A2-A2 cross section in FIG. 2 (c). FIG. In addition, illustration of the flexible printed circuit board 200 is abbreviate | omitted in Fig.2 (a).

  As shown in FIGS. 1 and 2, the projected capacitive touch panel 100 according to the embodiment includes a first substrate 10, a second substrate 20, an optical adhesive layer 30, and a sealing material layer 40. The sealing material layer 42 and the connection member 50 are provided.

The first substrate 10 includes a first transparent substrate 12, a first transparent electrode 14 formed on one surface of the first transparent substrate 12, and a first transparent electrode 14 and a second transparent electrode 22 (described later). And an external connection wiring 16 which is a wiring to be connected. A portion of the external connection wiring 16 that is connected to the outside is laminated with a conductive member layer 18 for wiring (see FIG. 2A). The first transparent electrode 14 and the external connection wiring 16 are made of, for example, an indium tin oxide film. The conductive member layer 18 is made of, for example, a silver paste formed into an electrode.
The second substrate 20 has a second transparent electrode 24 formed on one surface of the second transparent substrate 22 and the second transparent substrate 22.
In addition, about the shape and structure of the 1st transparent electrode 14, the external connection wiring 16, and the 2nd transparent electrode 24, since a well-known shape and structure can be used, specific description and illustration are abbreviate | omitted.

  The optical adhesive layer 30 fixes the first substrate 10 and the second substrate 20 with a predetermined first interval d1 therebetween. The optical adhesive layer 30 preferably contains a gap material 32 having a particle size of the same size as the predetermined first interval d1 (see FIG. 2B).

The sealing material layer 40 surrounds the optical adhesive layer 30.
Another sealing material layer 42 surrounds the connecting member 50 separately from the sealing material layer 40 (see FIG. 2C). The sealing material layer 40 and the other sealing material layer 42 include, for example, an epoxy-based adhesive containing a gap material for sealing material (not shown) having a particle size that is the same as the predetermined first distance d1. It consists of a cured agent.

  The connection member 50 connects the second transparent electrode 24 to the external connection wiring 16. The connecting member 50 is made of a conductive paste 52 containing conductive particles 54 having a particle size larger than the predetermined first interval d1 (see FIG. 2D). For example, a silver paste or a carbon paste can be used as the conductive paste. Further, as the conductive particles, for example, anisotropic conductive particles obtained by coating a resin (metal, nickel, gold, etc.) or metal (for example, copper, nickel) particles can be used.

  The conductive particles 54 have a particle size in the range of 101% to 150%, more specifically in the range of 110% to 130%, where the size of the predetermined first interval d1 is 100%. For example, 120%. Since the conductive particles 54 have a particle size larger than the predetermined first interval d1, the conductive particles 54 are compressed and deformed as shown in FIG.

Next, a method for manufacturing the projected capacitive touch panel according to the embodiment will be described.
FIG. 3 is a flowchart of the manufacturing method of the projected capacitive touch panel according to the embodiment.
FIG. 4 is a diagram for explaining the method for manufacturing the projected capacitive touch panel according to the embodiment. 4A is a view showing the first transparent substrate 10 after the sealing material forming step S3, and FIG. 4B is a view showing the second transparent substrate 20 after the connecting member forming step S4. FIG. 4C is a diagram showing the first substrate 10 and the second substrate 20 after the bonding step S5, and FIG. 4D is a diagram when the vacuum injection method is performed in the fixing step S6. (E) is a figure which shows the projection capacitive touch panel 100 after fixing process S6.

As shown in FIG. 3, the manufacturing method of the projected capacitive touch panel according to the embodiment includes a substrate preparation step S1, a conductive member layer stacking step S2, a sealing material forming step S3, a connecting member forming step S4, and bonding. Step S5 and fixing step S6 are included in this order.
Hereinafter, each step will be described.

1. Substrate preparation process S1
The substrate preparation step S1 includes the first substrate 10 having the first transparent electrode 14 formed on one surface of the first transparent substrate 12 and the first transparent substrate 12, and the second transparent substrate 22 and the second transparent substrate 22. This is a step of preparing the second substrate 20 having the second transparent electrode 24 formed on one surface. In the substrate preparation step S <b> 1 according to the embodiment, the first substrate 10 further including the external connection wiring 16 that connects the first transparent electrode 12 and the second transparent electrode 14 to the outside is prepared as the first substrate. The first transparent substrate 12 and the second transparent substrate 22 are made of, for example, soda lime glass. In addition, you may use what consists of glass other than soda-lime glass, and what consists of a plastic film as a 1st transparent substrate and a 2nd transparent substrate. Since the first substrate 10 and the second substrate 20 can be prepared using a known method (for example, a photolithography method), description and illustration are omitted.

2. Conductive member layer lamination step S2
The conductive member layer stacking step S2 is a step of stacking the conductive member layer 18 for wiring on at least a portion of the external connection wiring 16 that is connected to the outside. The conductive member layer 18 can be laminated by, for example, applying a silver paste on the external connection wiring 16 and forming the silver paste into an electrode. In addition, as a material of the conductive member layer, for example, molybdenum / aluminum / molybdenum three-layered metal, copper / copper alloy double-layered metal, or the like may be used.
In addition, you may implement a conductive member layer lamination process after a sealing material formation process.

3. Seal material forming step S3
The sealing material forming step S3 is a step of forming a sealing material 41 for bonding the first substrate 10 and the second substrate 20 with a predetermined first distance d1 on one surface of the first substrate 10. . The sealing material 41 is formed so as to surround the first transparent electrode 12. In the sealing material forming step S3, another sealing material 43 is further formed so as to surround the connection member 50 separately from the first transparent electrode 14 (see FIG. 4A). Formation of the sealing material 41 and the other sealing material 43 can be implemented by screen-printing an epoxy-type adhesive agent on the 1st transparent substrate 12, for example. Note that the sealing material and another sealing material may be formed on one surface of the second substrate 20.

4). Connecting member forming step S4
The connecting member forming step S4 is a step of forming a connecting member 50 for connecting the second transparent electrode 24 to the external connection wiring 16 on one surface of the second substrate 20 (see FIG. 4B). The connecting member may be formed on one surface of the first substrate. The connecting member 50 is made of a conductive paste 52 containing conductive particles 54 having a particle size larger than the predetermined first interval d1. As the conductive paste, for example, silver paste or carbon paste can be used, and as the conductive particles, for example, anisotropic conductive particles or metal (for example, copper) coated with metal (for example, nickel, gold, etc.) can be used. , Nickel) particles can be used. The connection member 50 can be formed, for example, by forming the above-described conductive paste by screen printing and converting the conductive paste into an electrode.

5. Bonding process S5
The bonding step S5 is a step of bonding the first substrate 10 and the second substrate 20 with the sealing material 41. The sealing material 41 becomes the sealing material layer 40 by being cured. In the bonding step S5, another sealing material 43 is also cured to form another sealing material layer 42 (see FIG. 4C). The bonding can be performed, for example, by thermally curing or UV curing a sealing material or another sealing material under a predetermined pressure condition.

6). Fixing process S6
In the fixing step S6, after the optical adhesive 34 is injected between the first substrate 10 and the second substrate 20 using a vacuum injection method (see FIG. 4D), the optical adhesive 34 is cured. In this step, the first substrate 10 and the second substrate 20 are fixed with a predetermined first distance d1 therebetween. The cured optical adhesive 34 becomes the optical adhesive layer 30.

In the fixing step S6, as the optical adhesive, an optical adhesive 34 containing a gap material 32 (see FIG. 2B) having a particle size the same as the predetermined first interval d1 is used. Is preferred.
Even when an optical adhesive containing a gap material is not used in the fixing step, the same effect can be obtained by the following manner. That is, in the bonding step, after the gap material having the same particle size as the predetermined first interval is spread on one surface of the first substrate or one surface of the second substrate, The substrate and the second substrate may be bonded together.

  Through the above steps, the projected capacitive touch panel 100 is completed (see FIG. 4E).

Next, the touch panel module 300 according to the embodiment will be described.
FIG. 5 is a view for explaining the touch panel module 300 according to the embodiment. 5A is a top view of the touch panel module 300, and FIG. 5B is a cross-sectional view taken along line A3-A3 of FIG. 5A.

  In the touch panel module 300 according to the embodiment, the projected capacitive touch panel 100, the cover lens 310, the projected capacitive touch panel 100, and the cover lens 310 according to the embodiment are spaced apart from each other by a predetermined second interval d2. A cover lens optical adhesive layer 330 that is fixed in a closed state, and a cover lens sealing material layer 340 that surrounds the cover lens optical adhesive layer 330.

The cover lens optical adhesive layer 330 has basically the same configuration as the optical adhesive layer 30, and the cover lens sealing material layer 340 has basically the same configuration as the sealing material layer 40.
The cover lens 310 is made of, for example, glass obtained by chemically strengthening soda lime glass or glass obtained by chemically strengthening aluminosilicate glass. In addition, as a cover lens, you may use what consists of glass other than the glass mentioned above, and what consists of a plastic film.

Next, a manufacturing method of the touch panel module according to the embodiment will be described.
FIG. 6 is a flowchart of the manufacturing method of the touch panel module according to the embodiment.

In the touch panel module manufacturing method according to the embodiment, as shown in FIG. 6, the touch panel / cover lens preparation step S11, the cover lens sealing material forming step S12, the cover lens bonding step S13, and the cover lens fixing step S14 are performed in this order. Including.
Hereinafter, each step will be described.

1. Touch panel / cover lens preparation process S11
The touch panel preparation step S11 is a step of preparing the projected capacitive touch panel 100 and the cover lens 310. In the embodiment, the projected capacitive touch panel 100 according to the present invention is prepared. However, a projected capacitive touch panel other than the projected capacitive touch panel 100 according to the present invention (particularly, a two-substrate). You may prepare the projection capacitive touch panel of a structure.
As the cover lens 310, for example, a glass made of a commercially available soda lime glass chemically strengthened or a glass obtained by chemically strengthening an aluminosilicate glass can be prepared. Further, frame-printed or icon-printed ones can be prepared on the glass bonding surface (not shown).

2. Cover lens sealing material forming step S12
In the cover lens sealing material forming step S13, the cover lens sealing material 341 for bonding the projected capacitive touch panel 100 and the cover lens 310 to the surface of the cover lens 310 with a predetermined second interval d2 therebetween. (Not shown). Since this process is basically the same as the sealing material forming process S3, detailed description and illustration are omitted. The cover lens sealing material may be formed on the surface of the projected capacitive touch panel (preferably the surface on the first substrate side).

3. Cover lens bonding step S13
The cover lens bonding step S13 is a step of bonding the projected capacitive touch panel 100 and the cover lens 310 with the cover lens sealing material 341. The cover lens sealing material 341 becomes the cover lens sealing material layer 340 by being cured. Since this process is basically the same process as the bonding process S5, detailed description and illustration are omitted.

4). Cover lens fixing step S14
In the cover lens fixing step S14, a cover lens optical adhesive 334 (not shown) is injected between the projected capacitive touch panel 100 and the cover lens 310 using a vacuum injection method, and then the cover lens is used. This is a step of fixing the projected capacitive touch panel 100 and the cover lens 310 by curing the optical adhesive 334 with a predetermined second distance d2. The cured cover lens optical adhesive 334 becomes the cover lens optical adhesive layer 330. Since this step is basically the same as the fixing step S6, detailed description and illustration are omitted.

  The touch panel module 300 is completed through the above steps.

  Hereinafter, effects of the projected capacitive touch panel manufacturing method, the touch panel module manufacturing method, the projected capacitive touch panel 100, and the touch panel module 300 according to the embodiment will be described.

  According to the method for manufacturing a projected capacitive touch panel according to the embodiment, the sealing material is formed so as to form the sealing material for bonding the first substrate 10 and the second substrate 20 with a predetermined first interval d1. Step S3, a bonding step S5 in which the first substrate 10 and the second substrate 20 are bonded together with the sealing material 41, and an optical adhesive 34 between the first substrate 10 and the second substrate 20 using a vacuum injection method. And the fixing step S6 for fixing the first substrate 10 and the second substrate 20 with a predetermined first distance d1 therebetween by curing the optical adhesive 34 in this order. By using an adhesive, it is possible to produce a high-quality projected capacitive touch panel with high yield, and it is possible to reduce equipment costs and management costs by using the vacuum injection method. As a result, it is possible to reduce the manufacturing cost than the prior art.

  In addition, according to the method for manufacturing a projected capacitive touch panel according to the embodiment, it is possible to manufacture a projected capacitive touch panel that can improve environmental reliability and has high reliability.

  In addition, according to the method for manufacturing the projected capacitive touch panel according to the embodiment, since the vacuum injection method is used, it is possible to prevent the overflow due to the shortage or excess of the optical adhesive, and to suppress the management cost, And it becomes possible to suppress apparatus cost by using an already existing apparatus.

  In addition, according to the method for manufacturing a projected capacitive touch panel according to the embodiment, the external connection wiring 16 is integrated on the first substrate 10 side to manufacture the projected capacitive touch panel. It is possible to manufacture a projected capacitive touch panel that can be incorporated at a low cost.

  Moreover, according to the manufacturing method of the projected capacitive touch panel according to the embodiment, in the sealing material forming step S3, another sealing material 43 is provided so as to surround the connecting member 50 separately from the first transparent electrode 12. Furthermore, since it forms, it becomes possible to protect a connection member from the deterioration resulting from an external environment, and it becomes possible to manufacture the projection capacitive touch panel which can improve environmental reliability.

  Further, according to the method for manufacturing the projected capacitive touch panel according to the embodiment, the connection member 50 includes the conductive page 54 including the conductive particles 54 having a particle size larger than the predetermined first interval d1. Since the strike 52 is used as the material, the conductivity of the connecting member is not only the conductivity of the conductive paste, but also the conductivity by the compression of the conductive particles, so that the overall resistance is reduced, the initial resistance is stabilized, and the environment The reliability can be further improved.

  Further, according to the method for manufacturing a projected capacitive touch panel according to the embodiment, the conductive member layer laminating step of laminating the conductive member layer 18 for wiring at least a portion connected to the outside of the external connection wiring 16. Since S2 is further included, it is possible to dramatically improve the connection reliability with the flexible printed circuit board through the anisotropic conductive film as compared with the case where only the conductive member layer is used.

  Moreover, according to the manufacturing method of the projected capacitive touch panel according to the embodiment, in the fixing step S6, the optical adhesive containing the gap material 32 having the same particle size as the predetermined first interval d1 is used. For this reason, the projection-type electrostatic that can suppress the occurrence of uneven color due to the unevenness of the space when light is passed through the space between the first substrate and the second substrate is more uniform. A capacitive touch panel can be manufactured.

  According to the manufacturing method of the touch panel module according to the embodiment, the cover for forming the cover lens sealing material 341 for bonding the projected capacitive touch panel 100 and the cover lens 310 with a predetermined second interval d2. The lens sealing material forming step S12, the cover lens bonding step S13 in which the projected capacitive touch panel 100 and the cover lens 310 are bonded with the cover lens sealing material 341, and the projection type electrostatic using a vacuum injection method. After injecting the cover lens optical adhesive 334 between the capacitive touch panel 100 and the cover lens 310, the cover capacitive optical adhesive 334 is cured, so that the projected capacitive touch panel 100 and the cover lens 310 are fixed. Cover lens fixing work for fixing with a predetermined second distance d2 Since S14 is included in this order, it is possible to manufacture a high-quality touch panel module with a high yield and use the vacuum injection method, as in the method of manufacturing the projected capacitive touch panel of the present invention. As a result, it is possible to suppress the equipment cost and the management cost, and as a result, it is possible to reduce the manufacturing cost as compared with the conventional case.

  In addition, according to the method for manufacturing a touch panel module according to the embodiment, the touch panel module 300 is manufactured by bonding the first substrate 10 side of the projected capacitive touch panel 100 and the cover lens 310, and thus the external connection wiring is provided. It is exposed to the side opposite to the cover lens, and connection with the outside can be performed after the manufacturing method of the touch panel module is completed. That is, specifically, it is not necessary to connect a flexible printed circuit board or the like on which an expensive driving IC is mounted first, and even when a defect occurs in the bonding between the projected capacitive touch panel and the cover lens. There is an effect that the flexible printed circuit board or the like is not wasted.

  Moreover, according to the manufacturing method of the touch panel module according to the embodiment, since the projected capacitive touch panel 100 prepared in the touch panel preparation step S1 has a two-sheet configuration, the cover glass is pasted as described above. It is easy to match, and is less susceptible to noise from the image display unit (for example, LCD panel) than a projected capacitive touch panel with a single substrate configuration, and can increase operational stability. It becomes possible.

  According to the projected capacitive touch panel 100 according to the embodiment, since it can be manufactured by the manufacturing method of the projected capacitive touch panel according to the embodiment, it is manufactured at a lower manufacturing cost than the conventional one. Is possible.

  Further, according to the projected capacitive touch panel 100 according to the embodiment, since the external connection wiring 16 is gathered on the first substrate 10 side, the material cost and the cost related to the process management are reduced, and the cost is low. A projection capacitive touch panel that can be incorporated can be manufactured.

  In addition, according to the projected capacitive touch panel 100 according to the embodiment, since the sealing member layer 42 is provided separately from the sealing member layer 40 and surrounds the connecting member 50, the connecting member is prevented from being deteriorated due to the external environment. It becomes possible to protect, and environmental reliability can be improved.

  In addition, according to the projected capacitive touch panel 100 according to the embodiment, the optical adhesive layer 30 includes the gap material 32 having the same particle size as the predetermined first interval d1, and thus the first substrate and the first substrate. It is possible to make the interval between the two substrates more uniform and suppress the occurrence of color unevenness due to the unevenness of the interval when light is passed through.

  According to the touch panel module 300 according to the embodiment, since it can be manufactured by the manufacturing method of the touch panel module according to the embodiment, it can be manufactured at a lower manufacturing cost than before.

[Experimental Example 1]
Experimental Example 1 is an experimental example for confirming the effect of the connecting member in the present invention.
In Experimental Example 1, a projected capacitive touch panel was basically manufactured by the same method as the projected capacitive touch panel manufacturing method according to the first embodiment. However, 0.4 mm thick soda lime glass was used as the first transparent substrate and the second transparent substrate. As the first transparent electrode and the second transparent electrode, an indium tin oxide film was formed by photolithography. As the sealing material, an epoxy adhesive containing a resin ball having a diameter of 3 μm was used, and the formation was performed by screen printing. As a material for the connecting member, a silver paste containing a gold coated resin ball having a diameter of 3.5 μm was used, and the formation was performed by screen printing. Moreover, since it does not relate to the matter to be confirmed in Experimental Example 1, in the method for manufacturing the projected capacitive touch panel according to Experimental Example 1, a gap material (corresponding to the gap material 32 in the embodiment) is not used. Further, the conductive member layer (corresponding to the conductive member layer 18 in the embodiment) is not formed.

  A test for examining the initial resistance of the transparent electrode including the connection member and the external connection wiring was performed on the projected capacitive touch panel according to Experimental Example 1 manufactured as described above. As a result, it was confirmed that the initial resistance was stable as the initial resistance of the transparent electrode and the external connection wiring without the connection member.

  In addition, an environmental test was performed on the projected capacitive touch panel according to Experimental Example 1. The environmental test is conducted at high temperature (80 ° C., 500 hours), low temperature (−30 ° C., 500 hours), high temperature and high humidity (60 ° C., humidity 90%, 500 hours), and temperature cycle (−30 ° C. to 80 ° C.). C., 100 cycles). As a result, it was confirmed that the resistance value was stable with almost no change regardless of the presence or absence of the connection member after the test of any item. That is, it can be said that the projected capacitive touch panel manufactured by the manufacturing method of the present invention does not become a structural weak point of the connecting member, and has high environmental resistance and high reliability.

  In addition, when the projected capacitive touch panel was manufactured as described above, there was no shortage or overflow of bubbles or optical adhesive. In other words, it is possible to produce high-quality projected capacitive touch panels with high yields, and it is possible to reduce equipment costs and management costs by using the vacuum injection method using existing machines. It was also confirmed that the manufacturing cost can be reduced.

[Experiment 2]
Experimental example 2 is an experimental example for confirming the effect of the gap material in the present invention.
In Experimental Example 2, the projected capacitive touch panel according to Experimental Example 2 was manufactured by the same method as the manufacturing method of the projected capacitive touch panel according to Experimental Example 1 except that the gap material was used.
As the gap material, resin balls having a diameter of 3 μm were used. After the gap material was dispersed on the second substrate, the first substrate and the second substrate were bonded together.

  When the projected capacitive touch panel was manufactured as described above, it was confirmed that there was no color unevenness due to the unevenness of the interval when light was passed through. It was also confirmed that no bubbles were generated. It should be noted that the color unevenness of the projected capacitive touch panel according to Experimental Example 1 was practically no problem.

[Experiment 3]
Experimental Example 3 is an experimental example for confirming the effect of the conductive member layer in the present invention.
In Experimental Example 3, the projected capacitive touch panel according to Experimental Example 3 is manufactured in the same manner as the manufacturing method of the projected capacitive touch panel according to Experimental Example 1 except that the conductive member layer is formed. did.
The conductive member layer was formed by screen printing a silver paste on the external connection wiring (made of indium tin oxide film).
Moreover, in order to confirm the connection condition with the exterior, the anisotropic conductive film was temporarily press-bonded to the external connection wiring, and after the flexible printed circuit board was aligned, the thermo-compression bonding was performed for connection.

  Producing a projected capacitive touch panel as described above, and examining the initial resistance from the transparent electrode including the connecting member to the terminal of the flexible printed circuit board of the external drive circuit, it can be confirmed that it is stable. It was. Moreover, the environmental test similar to Experimental example 1 was also performed, and it was confirmed that the resistance value was stable.

[Experimental Example 4]
Experimental Example 4 is an experimental example for confirming the effect of the method for manufacturing a touch panel module according to the present invention.
In Experimental Example 4, a touch panel module was basically manufactured by the same method as the touch panel module manufacturing method according to the first embodiment. However, the projection type capacitive touch panel prepared in Experiment Example 1 was prepared. As the cover lens sealing material, an epoxy adhesive containing resin balls having a diameter of 3 μm was used. The cover lens sealing material was formed on the surface of the projected capacitive touch panel.

  When the touch panel module was manufactured as described above, there was no air bubble, lack of optical adhesive, or overflow. In other words, it is possible to manufacture a high-quality touch panel module with a high yield, and it is possible to reduce equipment costs and management costs by using the vacuum injection method. It was confirmed that it would be possible.

  As mentioned above, although this invention was demonstrated based on said embodiment, this invention is not limited to said embodiment. The present invention can be carried out in various modes without departing from the spirit thereof, and for example, the following modifications are possible.

(1) The dimensions, the number, the material, and the shape of each component described in the above embodiments are exemplifications, and can be changed within a range not impairing the effects of the present invention.

(2) In the manufacturing method of the projected capacitive touch panel of the present invention, after the fixing step, a thickness reducing step for reducing the thickness of both or one of the first transparent substrate and the second transparent substrate is performed. Further, it may be included. By adopting such a method, even a projection capacitive touch panel having a two-substrate configuration can have a thickness equivalent to that of a projection capacitive touch panel having a single-substrate configuration.

(3) Although the projected capacitive touch panel is manufactured using the gap material 32 in the above embodiment, the present invention is not limited to this. A projected capacitive touch panel may be manufactured without using a gap material. Even with such a method, it is possible to manufacture a projected capacitive touch panel that does not actually cause color unevenness.

(4) In the present invention, a projection capacitive touch panel manufacturing method using a sealing material and a vacuum injection method is used for the purpose of preventing overflow due to excessive adhesive, but this object is achieved. Possible methods include the following methods. That is, one of the first substrate and the second substrate is subjected to optical repellent adhesive processing (OCR repellent processing) so as to surround the first transparent electrode or the second transparent electrode, and then optically bonded to one substrate. In this method, the agent is dropped and the other of the first substrate and the second substrate is bonded to the other substrate in parallel with a predetermined speed and pressure. By adopting such a method, it is possible to solve the problem that the optical adhesive overflows from the end face of the transparent substrate when the amount of the optical adhesive is excessive, and it is possible to reduce the management cost than before. Become. In addition, the process management is easier than in the conventional method of manufacturing a projected capacitive touch panel having a two-substrate configuration, and stable bonding is possible.

DESCRIPTION OF SYMBOLS 10 ... 1st board | substrate, 12 ... 1st transparent substrate, 14 ... 1st transparent electrode, 16 ... External connection wiring, 18 ... Conductive member layer, 20 ... 2nd board | substrate, 22 ... 2nd transparent substrate, 24 ... 2nd Transparent electrode, 30 ... optical adhesive layer, 32 ... gap material, 34 ... optical adhesive, 40 ... sealing material layer, 41 ... sealing material, 42 ... another sealing material layer, 43 ... another sealing material, 50 ... connection Members 52 ... conductive paste 54 ... conductive particles 100 ... projected capacitive touch panel 200 ... flexible printed circuit board 300 ... touch panel module 310 ... cover lens 330 ... optical adhesive layer for cover lens, 340 ... Sealing material layer for cover lens

Claims (12)

A method for producing a projected capacitive touch panel,
A first substrate having a first transparent electrode formed on one surface of the first transparent substrate and the first transparent substrate, and a second transparent formed on one surface of the second transparent substrate and the second transparent substrate. A substrate preparation step of preparing a second substrate having electrodes;
A sealing material for forming a sealing material for bonding the first substrate and the second substrate to each other surface of the first substrate or one surface of the second substrate with a predetermined first interval. Forming process;
A bonding step of bonding the first substrate and the second substrate with the sealing material;
After injecting an optical adhesive between the first substrate and the second substrate using a vacuum injection method, the first adhesive and the second substrate are bonded to the predetermined substrate by curing the optical adhesive. A method of manufacturing a projected capacitive touch panel, comprising: a fixing step of fixing in a state where a first interval is provided. In the manufacturing method of the projected capacitive touch panel according to claim 1,
In the substrate preparation step, as the first substrate, a first substrate further having external connection wiring for connecting the first transparent electrode and the second transparent electrode to the outside is prepared,
A projection type electrostatic capacitance further comprising a connection member forming step for forming a connection member for connecting the second transparent electrode to the external connection wiring after the substrate preparation step and before the bonding step. Manufacturing method for capacitive touch panel. In the manufacturing method of the projected capacitive touch panel according to claim 2,
In the sealing material forming step, another sealing material is further formed so as to surround the connection member separately from the first transparent electrode or the second transparent electrode. Manufacturing method. In the manufacturing method of the projected capacitive touch panel according to claim 2 or 3,
The method of manufacturing a projected capacitive touch panel, wherein the connection member is made of a conductive paste containing conductive particles having a particle size larger than the predetermined first interval. In the manufacturing method of the projected capacitive touch panel according to any one of claims 2 to 4,
After the substrate preparation step, the projection capacitive type further includes a conductive member layer laminating step of laminating a conductive member layer for wiring on at least a portion of the external connection wiring connected to the outside. A method for manufacturing a touch panel. In the manufacturing method of the projected capacitive touch panel according to any one of claims 1 to 5,
In the fixing step, as the optical adhesive, an electrostatic adhesive containing a gap material having a particle size of the same size as the predetermined first interval is used. Manufacturing method. In the manufacturing method of the projected capacitive touch panel according to any one of claims 1 to 5,
In the bonding step, a gap material having a particle size of the same size as the predetermined first interval is spread on the one surface of the first substrate or the one surface of the second substrate. The method of manufacturing a projected capacitive touch panel, wherein the first substrate and the second substrate are bonded together. In the manufacturing method of the projected capacitive touch panel according to any one of claims 1 to 7,
A method of manufacturing a projected capacitive touch panel, further comprising a thickness reduction step of reducing a thickness of both or one of the first transparent substrate and the second transparent substrate after the fixing step. A touch panel / cover lens preparation process for preparing a projected capacitive touch panel and a cover lens;
A cover lens sealing material for bonding the projected capacitive touch panel and the cover lens to the surface of the projected capacitive touch panel or the surface of the cover lens with a predetermined second interval. A cover lens sealing material forming step to be formed;
A cover lens laminating step of laminating the projected capacitive touch panel and the cover lens with the cover lens sealing material;
After injecting an optical adhesive for the cover lens between the projected capacitive touch panel and the cover lens by using a vacuum injection method, the optical adhesive for the cover lens is cured to thereby cure the projected electrostatic A method of manufacturing a touch panel module, comprising: a cover lens fixing step of fixing a capacitive touch panel and the cover lens in a state in which the predetermined second interval is provided. A first substrate having a first transparent substrate and a first transparent electrode;
A second substrate having a second transparent substrate and a second transparent electrode;
An optical adhesive layer for fixing the first substrate and the second substrate at a predetermined first interval;
A sealing material layer surrounding the optical adhesive layer,
The first substrate further includes external connection wiring for connecting the first transparent electrode and the second transparent electrode to the outside,
A connection member for connecting the second transparent electrode to the external connection wiring;
In addition to the sealing material layer, the projection capacitive touch panel further comprising another sealing material layer surrounding the connecting member. The projected capacitive touch panel according to claim 10,
The projected capacitive touch panel, wherein the optical adhesive layer contains a gap material having a particle size equal to the size of the predetermined first interval. A projected capacitive touch panel;
A cover lens;
An optical adhesive layer for a cover lens that fixes the projected capacitive touch panel and the cover lens at a predetermined second interval;
A touch panel module comprising: a cover lens sealing material layer surrounding the cover lens optical adhesive layer.

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