Optical laminate with an adhesive layer, image display device, and method for manufacturing the same

Abstract

To provide an optical laminate with adhesive layers which produce an image display device with high functionality and a large display area in proportion without reducing the yield.SOLUTION: An optical laminate with adhesive layers according to the present invention comprises: an optical film; a first adhesive layer formed on one surface of the optical film; and a second adhesive layer formed on the other surface of the optical film. The optical laminate with adhesive layers has a throughhole integrally penetrating the first adhesive layer, optical film, and second adhesive layer.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an optical laminate with an adhesive layer, an image display device, and methods for manufacturing them.

Background Art

[0002] In image display devices such as smartphones, tablet terminals, and notebook personal computers (PCs), an optical laminate including optical films such as a polarizer and a retardation plate is used. In recent years, the functionality of image display devices has been improving, and various functions such as cameras, speakers, and various sensors are provided. In addition, in image display devices, the trend is towards full-face displays. However, by making the entire surface a display, an optical laminate is also disposed above the portions where the above-described cameras, speakers, and various sensors are arranged, and there are cases where the desired functions of these components cannot be fully exhibited. Therefore, an optical laminate having an opening formed to correspond to the portions having these functions has been proposed (Patent Document 1).

[0003] An optical laminate is usually bonded to other constituent members via an adhesive layer. When bonding an optical laminate having an opening and other constituent members via an adhesive layer, there is a problem that alignment of the constituent members of the image display device becomes difficult and the yield decreases. Therefore, it is necessary to design so that the non-display area becomes large, and there is a problem that it becomes difficult to achieve a full-face display.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been made to solve the above-described conventional problems, and its main object is to provide an optically laminated body with an adhesive layer capable of realizing a high-performance image display device with a large ratio of the display portion without reducing the yield.

Means for Solving the Problems

[0006] The optically laminated body with an adhesive layer of the present invention includes an optical film, a first adhesive layer formed on one surface of the optical film, and a second adhesive layer formed on the other surface of the optical film. This optically laminated body has a through hole that integrally penetrates the first adhesive layer, the optical film, and the second adhesive layer. In one embodiment, the optical film is at least one selected from the group consisting of a polarizing plate, a retardation film, a conductive film for a touch panel, a pressure-sensitive film, and a transparent plastic film. In another aspect of the present invention, a method for manufacturing an optically laminated body with an adhesive layer is provided. This method for manufacturing an optically laminated body includes a step of forming a first adhesive layer on one surface of an optical film, a step of forming a second adhesive layer on the other surface of the optical film, and a step of forming a through hole that integrally penetrates the first adhesive layer, the optical film, and the second adhesive layer.

Effects of the Invention

[0007] According to the present invention, there is provided an optical laminate with an adhesive layer capable of realizing a high-performance image display device with a large ratio of the display portion without reducing the yield. The optical laminate with an adhesive layer of the present invention includes an optical film, a first adhesive layer formed on one surface of the optical film, and a second adhesive layer formed on the other surface of the optical film. The optical laminate with an adhesive layer of the present invention has a through hole that integrally penetrates the first adhesive layer, the optical film, and the second adhesive layer. By using the optical laminate with an adhesive layer of the present invention, even when cameras, speakers, and various sensors are arranged in the display portion of the image display device, alignment becomes easy and the yield can be improved. Therefore, it may also be possible to realize an image display device with a larger ratio of the display area (for example, an image display device with a full-face display).

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

[0010] A. Overall Configuration of the Optical Laminate with an Adhesive Layer FIG. 1 is a schematic cross-sectional view of an optical laminate with an adhesive layer according to one embodiment of the present invention. The optical laminate 100 with an adhesive layer in the illustrated example has an optical film 10, a first adhesive layer 20 formed on one surface of the optical film 10, and a second adhesive layer 30 formed on the other surface of the optical film 10. Practically, in order to appropriately protect the first adhesive layer 20 and the second adhesive layer 30 until use, separators 40 are temporarily attached to these adhesive layers in a peelable manner. The optical laminate 100 with an adhesive layer has a through-hole 50 that penetrates the optical film 10, the first adhesive layer 20, and the second adhesive layer 30 integrally. The through-hole 50 is formed to have a position, size, number, and shape corresponding to a camera, a speaker, and various sensors mounted on the image display device. By having such a through-hole 50 in the optical laminate 100 with an adhesive layer, when the optical film is bonded to other components, there is no deviation between the optical film and each adhesive layer, and alignment can be facilitated. Further, since the through-hole 50 is formed to correspond to a camera, a speaker, and various sensors, etc., the functions they have can be fully exhibited without being hindered by the optical film and the adhesive layer. Typically, the optical laminate with an adhesive layer can be disposed on the image display device such that the first adhesive layer is on the viewing side of the image display device.

[0011] The through-hole 50 is formed in any suitable shape and size. Examples of the shape of the through-hole (the shape when viewed in plan) include a circular shape, a rectangular shape, etc. When forming a circular through-hole, for example, a through-hole with a diameter of 1 mm to 30 mm is formed. The through-hole may be a through-hole that penetrates the optical laminate as a columnar body such as a cylinder or a polygonal prism, or may be a through-hole that penetrates the optical laminate in a tapered shape, that is, a frustum shape. Also, the size of the through-hole may be different between each layer, for example, between the adhesive layer and the optical film.

[0012] In one embodiment, the through hole is a through hole that penetrates the optical laminate in a tapered shape. For improving the design of smartphones, the punch-hole type has become widespread as a method for installing the front camera. Due to the high demand for selfies, a wider-angle front camera is desired, and the hole diameter is increasing. On the other hand, black frame printing is required to cover the hole cut surface and prevent light leakage from the display, but an increase in the non-display area can reduce the design. By having the through hole in a tapered shape, it is possible to achieve a wider angle when arranging the camera and cover the hole end, and it can enable a configuration that reduces black frame printing and the non-display area. When the through hole is in a tapered shape, the size of the planar shape of the through hole on the outermost surface of the first adhesive layer (hereinafter also referred to as the planar shape of the first through hole) and the planar shape of the through hole on the outermost surface of the second adhesive layer (hereinafter also referred to as the planar shape of the second through hole) can be designed to have any appropriate difference. For example, when the planar shape of the through hole is circular, the difference between the diameter of the planar shape of the first through hole and the diameter of the planar shape of the second through hole is preferably 5 μm to 500 μm, more preferably 10 μm to 250 μm, and even more preferably 20 μm to 150 μm. Also, for example, when the planar shape of the through hole is rectangular or elliptical, the difference between the size of the planar shape of the first through hole (e.g., the length of one side, minor axis, major axis, etc.) and the size of the planar shape of the second through hole (e.g., the length of one side, minor axis, major axis, etc.) is preferably 5 μm to 500 μm, more preferably 10 μm to 250 μm, and even more preferably 20 μm to 150 μm. The difference in the size of the planar shape of the through hole only needs to be within the above range at the part where the difference is the smallest. Note that the planar shape of the first through hole and the planar shape of the second through hole may be different shapes or the same shape (i.e., similar shapes).

[0013] In one embodiment, the difference in size between the planar shape of the first through hole and the planar shape of the second through hole is preferably 500 μm or less, more preferably 300 μm or less, and even more preferably 150 μm or less. For improving the design of smartphones, the punch-hole type has become widespread as a method of installing the front camera. Although it is more preferable in terms of design to reduce the diameter of the hole, there is a problem that the width of the black frame printing has to be increased due to misalignment during bonding of each member and variations in the size of the through holes. By the difference between the planar shape of the first through hole and the planar shape of the second through hole being within the above range, the width of the black frame printing can be reduced, and the design can be improved.

[0014] In this embodiment, the planar shape of the first through hole may be larger, or the planar shape of the second through hole may be larger. When the planar shape of the first through hole is larger than the planar shape of the second through hole, that is, when the planar shape of the through hole on the viewing side is larger, for example, when arranging the through hole to correspond to the camera unit, it is possible to achieve wide-angle conversion of the camera and masking of the hole end, and to enable a configuration with less black frame printing and non-display area. Also, when the planar shape of the first through hole is smaller than the planar shape of the second through hole, that is, when the planar shape of the through hole on the viewing side is smaller, for example, when arranging the through hole to correspond to the camera unit, the black frame printing and non-display area can be reduced to improve the design. Furthermore, the distance between the camera module and the viewing side can be reduced to achieve wide-angle conversion and prevent interference with the camera module.

[0015] In one embodiment, it is preferable that the size of the planar shape of the through holes formed in the first adhesive layer and the second adhesive layer is larger than the size of the through holes formed in the optical film. When laminating the adhesive layer-attached optical laminate having through holes to an adherend, the adhesive may protrude into the through holes due to the pressure during lamination, which may deteriorate the appearance quality or impair the functions of sensors such as cameras. The distance between the ends of the through holes formed in the first adhesive layer and the second adhesive layer and the ends of the through holes formed in the optical film is preferably 5 μm to 1000 μm, more preferably 10 μm to 500 μm, and even more preferably 20 μm to 250 μm. When the distance between the ends of the through holes formed in the first adhesive layer and the second adhesive layer and the ends of the through holes formed in the optical film is within the above range, an optical laminate with excellent appearance and capable of well performing the functions of sensors such as cameras can be obtained. The distance between the end of the through hole formed in the first adhesive layer and the end of the through hole formed in the optical film and the distance between the end of the through hole formed in the second adhesive layer and the end of the through hole formed in the optical film may be the same or different.

[0016] In the illustrated example, the through hole 50 is formed so as to penetrate the separator 40, but the separator 40 may not have a through hole formed therein. Further, the separator 40 may be any one that can appropriately protect the first adhesive layer and the second adhesive layer until use, and may have the same shape as the optical film, the first and second adhesive layers, or may have different shapes and sizes.

[0017] An arbitrary appropriate surface treatment layer may be provided between the optical film 10 and the first adhesive layer 20 according to the purpose. Examples of the surface treatment layer include a hard coat layer, an antireflection layer, an antiglare layer, and an anti-glare layer.

[0018] Hereinafter, the optical film 10, the first adhesive layer 20, and the second adhesive layer 30 will be described in detail.

[0019] B. Optical film As the optical film 10, any appropriate optical film can be used. The optical film may be a film composed of a single layer or a laminate. Specific examples of the optical film composed of a single layer include a polarizer and a retardation film. Specific examples of the optical film composed as a laminate include a polarizing plate (typically, a laminate of a polarizer and a protective film), a conductive film for a touch panel, a surface treatment film, a pressure-sensitive film, and a laminate appropriately laminated according to the purpose of these optical films composed of a single layer and / or optical films composed as a laminate (for example, a circularly polarizing plate for antireflection, a polarizing plate with a conductive layer for a touch panel). Hereinafter, as an example, the polarizing plate will be described in detail. Preferably, the optical film is at least one selected from the group consisting of a polarizing plate, a retardation film, a conductive film for a touch panel, a pressure-sensitive film, and a transparent plastic film (for example, a cycloolefin resin, a polyethylene terephthalate resin, an acrylic resin, a polycarbonate resin, etc.).

[0020] B-1. Polarizing plate The polarizing plate typically includes a polarizer and a protective film. Depending on the use and the like, the above surface treatment layer may be further provided.

[0021] B-1-1. Polarizer The polarizer is typically composed of a resin film containing a dichroic substance. As the resin film, any appropriate resin film that can be used as a polarizer can be adopted. The resin film is typically a polyvinyl alcohol-based resin (hereinafter referred to as "PVA-based resin") film.

[0022] As the PVA-based resin for forming the above PVA-based resin film, any suitable resin can be used. For example, polyvinyl alcohol and ethylene-vinyl alcohol copolymer can be mentioned. Polyvinyl alcohol is obtained by saponifying polyvinyl acetate. Ethylene-vinyl alcohol copolymer is obtained by saponifying ethylene-vinyl acetate copolymer. The saponification degree of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, more preferably 99.0 mol% to 99.93 mol%. The saponification degree can be determined according to JIS K 6726-1994. By using a PVA-based resin with such a saponification degree, a polarizer with excellent durability can be obtained. If the saponification degree is too high, there is a risk of gelation.

[0023] The average polymerization degree of the PVA-based resin can be appropriately selected according to the purpose. The average polymerization degree is usually 1000 to 10000, preferably 1200 to 4500, more preferably 1500 to 4300. The average polymerization degree can be determined according to JIS K 6726-1994.

[0024] Examples of the dichroic substance contained in the resin film include iodine, organic dyes, etc. These can be used alone or in combination of two or more. Preferably, iodine is used.

[0025] The resin film may be a single-layer resin film or a laminate of two or more layers.

[0026] As a specific example of a polarizer composed of a single-layer resin film, there may be mentioned one obtained by subjecting a PVA-based resin film to a dyeing treatment with iodine and a stretching treatment (typically, uniaxial stretching). The above-mentioned dyeing with iodine is performed, for example, by immersing the PVA-based resin film in an iodine aqueous solution. The stretching ratio of the above-mentioned uniaxial stretching is preferably 3 to 7 times. The stretching may be performed after the dyeing treatment, or may be performed while dyeing. Also, dyeing may be performed after stretching. If necessary, the PVA-based resin film is subjected to a swelling treatment, a crosslinking treatment, a washing treatment, a drying treatment, etc. For example, by immersing the PVA-based resin film in water and washing it before dyeing, not only can the dirt on the surface of the PVA-based resin film and the blocking inhibitor be washed, but also the PVA-based resin film can be swollen to prevent uneven dyeing and the like.

[0027] As a specific example of a polarizer obtained using a laminate, there may be mentioned a polarizer obtained using a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a laminate of a resin substrate and a PVA-based resin layer formed by coating on the resin substrate. A polarizer obtained using a laminate of a resin substrate and a PVA-based resin layer formed by coating on the resin substrate can be produced, for example, by coating a PVA-based resin solution on the resin substrate and drying it to form a PVA-based resin layer on the resin substrate to obtain a laminate of the resin substrate and the PVA-based resin layer; stretching and dyeing the laminate to make the PVA-based resin layer a polarizer; In the present embodiment, the stretching typically includes immersing the laminate in a boric acid aqueous solution and stretching it. Further, the stretching may further include, if necessary, air-stretching the laminate at a high temperature (for example, 95°C or higher) before stretching in the boric acid aqueous solution. The obtained laminate of the resin substrate / polarizer may be used as it is (that is, the resin substrate may be used as a protective film for the polarizer), or the resin substrate may be peeled off from the laminate of the resin substrate / polarizer, and an arbitrary appropriate protective film according to the purpose may be laminated on the peeled surface and used. Details of such a method for manufacturing a polarizer are described, for example, in Japanese Patent Application Laid-Open No. 2012-73580. The entire description of the publication is incorporated herein by reference.

[0028] The polarizer preferably exhibits absorption dichroism at any wavelength in the wavelength range of 380 nm to 780 nm. The single transmittance of the polarizer is preferably 43.0% to 46.0%, more preferably 44.5% to 46.0%. The degree of polarization of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and even more preferably 99.9% or more.

[0029] The thickness of the polarizer can be set to any appropriate value. The thickness is typically 0.5 μm or more and 80 μm or less, preferably 30 μm or less, more preferably 25 μm or less, even more preferably 18 μm or less, particularly preferably 12 μm or less, and even more particularly preferably less than 8 μm. The thickness of the polarizer is preferably 1 μm or more.

[0030] B-1-2. Protective Film As the protective film, any appropriate resin film is used. Examples of the forming material of the resin film include (meth)acrylic resins, cellulose resins such as diacetyl cellulose and triacetyl cellulose, cycloolefin resins such as norbornene resins, olefin resins such as polypropylene, ester resins such as polyethylene terephthalate resins, polyamide resins, polycarbonate resins, and copolymer resins thereof. Note that the “(meth)acrylic resin” refers to an acrylic resin and / or a methacrylic resin.

[0031] The thickness of the protective film is typically 10 μm to 100 μm, preferably 20 μm to 40 μm. The protective film is typically laminated on the polarizer via an adhesive layer (specifically, an adhesive layer or a pressure-sensitive adhesive layer). The adhesive layer is typically formed of a PVA-based adhesive or an active energy ray-curable adhesive. The pressure-sensitive adhesive layer is typically formed of an acrylic pressure-sensitive adhesive. This acrylic pressure-sensitive adhesive may be the same as or different from the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer.

[0032] C. First Adhesive Layer As the adhesive constituting the first adhesive layer, any suitable adhesive having adhesiveness and transparency that can be used for optical applications can be employed. Specific examples include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, and polyether adhesives. The base resin of the adhesive may be used alone or in combination of two or more. From the viewpoints of transparency, processability, durability, etc., acrylic adhesives are preferred.

[0033] Acrylic pressure-sensitive adhesive compositions typically contain a (meth)acrylic polymer as the main component (base polymer). The (meth)acrylic polymer can be contained in the pressure-sensitive adhesive composition at a ratio of, for example, 50% by weight or more, preferably 70% by weight or more, and more preferably 90% by weight or more in the solid content of the pressure-sensitive adhesive composition. The (meth)acrylic polymer contains alkyl (meth)acrylate as the main component as monomer units. Note that (meth)acrylate refers to acrylate and / or methacrylate. Examples of the alkyl group of the alkyl (meth)acrylate include linear or branched alkyl groups having 1 to 18 carbon atoms. The average number of carbon atoms of the alkyl group is preferably 3 to 9. As monomers constituting the (meth)acrylic polymer, in addition to alkyl (meth)acrylate, comonomers such as carboxyl group-containing monomers, hydroxyl group-containing monomers, amide group-containing monomers, aromatic ring-containing (meth)acrylates, and heterocyclic ring-containing (meth)acrylates can be mentioned. The comonomer is preferably a hydroxyl group-containing monomer and / or a heterocyclic ring-containing (meth)acrylate, and more preferably N-acryloylmorpholine. The acrylic pressure-sensitive adhesive composition may preferably contain a silane coupling agent and / or a crosslinking agent. Examples of the silane coupling agent include epoxy group-containing silane coupling agents. Examples of the crosslinking agent include isocyanate-based crosslinking agents and peroxide-based crosslinking agents. Details of such a pressure-sensitive adhesive layer or acrylic pressure-sensitive adhesive composition are described, for example, in JP-A-2014-115468 and Japanese Patent No. 4140736, and the descriptions of these publications are incorporated herein by reference.

[0034] The thickness of the first pressure-sensitive adhesive layer is set to any appropriate value. The thickness of the first pressure-sensitive adhesive layer is preferably 20 μm or more, more preferably 40 μm or more, and even more preferably 50 μm or more. Also, the thickness of the first pressure-sensitive adhesive layer is preferably 500 μm or less, more preferably 350 μm or less, and even more preferably 250 μm or less.

[0035] The first adhesive layer preferably has a storage modulus G' at 25°C of 1.0×10 4 Pa to 1.0×10 7 Pa, more preferably 3.0×10 4 Pa to 7.0×10 6 Pa, and even more preferably 5.0×10 4 Pa to 5.0×10 6 Pa. When the storage modulus G' at 25°C is within such a range, deformation of the adhesive layer can be prevented even when pressure is applied during lamination. Alternatively, through holes can be formed well in the optical laminate with the adhesive layer. In this specification, the storage modulus G' refers to a value measured in accordance with the method described in JIS K7244-1 "Plastics - Test Methods for Dynamic Mechanical Properties".

[0036] D. The second adhesive layer As the adhesive constituting the second adhesive layer, the same adhesive as the adhesive constituting the first adhesive layer may be used, or a different adhesive may be used. When using an adhesive different from the first adhesive layer, adhesives well-known and commonly used in the industry can be used as the adhesive. Specifically, adhesives based on polymers such as acrylic polymers, silicone polymers, polyesters, polyurethanes, polyamides, polyvinyl ethers, vinyl acetate / vinyl chloride copolymers, modified polyolefins, epoxy-based, fluorine-based, natural rubbers, and synthetic rubbers can be mentioned.

[0037] The thickness of the second adhesive layer can be set to any appropriate value. It is preferably 3 μm to 500 μm, more preferably 5 μm to 350 μm, even more preferably 10 μm to 250 μm, and particularly preferably 10 μm to 150 μm.

[0038] The second adhesive layer preferably has a storage modulus G' at 25°C of 1.0×10 4 Pa to 1.0×10 7 Pa, more preferably 3.0×10 4 Pa to 5.0×10 6 Pa, and even more preferably 5.0×104 Pa to 1.0×10 6 Pa. If the storage elastic modulus G’ of the second adhesive layer is within the above range, the optical laminate can be adhered well. Further, through holes can be formed well in the optical laminate with an adhesive layer.

[0039] E. Other Layers The optical laminate with an adhesive layer may further include any other appropriate layer other than the above optical film, first and second adhesive layers. Examples of other layers include the above separator and optical functional film. The separator is used to appropriately protect the first and second adhesive layers until use. The optical functional film is used to impart a desired optical function according to the purpose to the optical laminate with an adhesive layer. Examples of the optical functional film include, for example, a polarizer or a protective film for a polarizing plate, an antireflection film, an antiglare film, a conductive film for a touch panel, a pressure-sensitive film, and the like.

[0040] F. Method for Manufacturing an Optical Laminate with an Adhesive Layer The optical laminate with an adhesive layer of the present invention can be manufactured by any appropriate method. Preferably, the optical laminate with an adhesive layer includes a step of forming a first adhesive layer on one surface of the optical film, a step of forming a second adhesive layer on the other surface of the optical film, and a step of forming a through hole that integrally penetrates the first adhesive layer, the optical film, and the second adhesive layer.

[0041] F-1. Formation of the Adhesive Layer The above first and second adhesive layers are formed on the optical film by any appropriate method. For example, an adhesive layer may be formed by applying an adhesive for forming the first adhesive layer or an adhesive for forming the second adhesive layer to the optical film, or an adhesive layer may be formed by applying an adhesive on a separator or another resin film and then transferring the adhesive layer to the optical film. Further, the first and second adhesive layers may be formed in any appropriate order.

[0042] In one embodiment, the size of the through holes formed in the first adhesive layer and the second adhesive layer is larger than the through holes formed in the optical film. In this embodiment, for example, the adhesive layer can be formed such that the end of the through hole formed in the adhesive layer and the end of the through hole formed in the optical film are at any appropriate distance.

[0043] As the coating method of the adhesive composition, any appropriate coating method can be used. For example, roll coating, kiss roll coating, gravure coating, reverse coating, roll brush, spray coating, dip roll coating, bar coating, knife coating, air knife coating, curtain coating, lip coating, extrusion coating method using a die coater, etc. can be mentioned.

[0044] F-2. Formation of Through Holes In the optical film formed with the first adhesive layer and the second adhesive layer, through holes that penetrate these integrally are then formed. When forming the through holes, it is preferable that a separator or a surface protection film is laminated on the first adhesive layer and the second adhesive layer in order to appropriately protect the adhesive layer.

[0045] The through holes can be formed by any appropriate method. For example, punching blades such as Thomson blades and pinnacle blades, cutting by a spindle, etc., a cutter, or drilling by a laser, etc. can be mentioned. The processing conditions when forming the through holes can be set to any appropriate conditions according to the through hole forming means used, the thickness of the first adhesive layer, the optical film, the second adhesive layer, and any separator or surface protection film, the type of the optical film, etc.

[0046] In one embodiment, the through-hole is formed to penetrate integrally the first adhesive layer, the optical film, and the second adhesive layer in a state where the first adhesive layer and the second adhesive layer are laminated on the optical film. By forming the through-hole in a state where the first adhesive layer, the second adhesive layer, and the optical film are laminated, deformation of the hole shape due to tension and pressure during lamination of each layer and / or during separator peeling can be suppressed.

[0047] F-3. Other processes The optical laminate with an adhesive layer of the present invention may include any appropriate process other than the process of forming the adhesive layer and the process of forming the through-hole. For example, a process of peeling the surface protection film used in the process of forming the through-hole, a process of laminating a separator on the adhesive layer from which the surface protection film has been peeled, and the like can be mentioned.

[0048] G. Use of the optical laminate with an adhesive layer As described above, the optical laminate with an adhesive layer of the present invention can highly exhibit various functions (for example, functions by a camera, a speaker, various sensors) provided in a high-performance image display device. Therefore, it can be suitably used for an image display device. Examples of the image display device include a liquid crystal display device and an organic EL device. Specifically, the liquid crystal display device includes a liquid crystal panel including a liquid crystal cell and the polarizer disposed on one or both sides of the liquid crystal cell. The organic EL device includes an organic EL panel in which the polarizer is disposed on the viewing side.

[0049] In the image display device, the optical laminate with an adhesive layer of the present invention can be laminated on any appropriate adherend. For example, a glass plate, a cell, another optical laminate, and the like can be mentioned. Hereinafter, the image display device will be specifically described.

[0050] G-1. Image display device The image display device of the present invention includes the above-mentioned optical laminate with an adhesive layer, a display panel disposed on one surface of the optical laminate with an adhesive layer and having a through hole at a portion corresponding to the through hole of the optical laminate with an adhesive layer, and a glass layer or a plastic layer disposed on the other surface of the optical laminate with an adhesive layer.

[0051] FIG. 2 is a schematic cross-sectional view of an image display device according to one embodiment of the present invention. The image display device 200 in the illustrated example includes an optical laminate 100 having an optical film 10, a first adhesive layer 20 formed on one surface of the optical film 10, and a second adhesive layer 30 formed on the other surface of the optical film 10. In the illustrated example, a glass layer or a plastic layer 140 is laminated on the first adhesive layer 20, and a display panel 150 is laminated on the second adhesive layer 30. The display panel 150 has a through hole at a position corresponding to the through hole formed in the optical film 100. In the illustrated example, a glass layer or a plastic layer 140 is laminated on the first adhesive layer 20 and a display panel 150 having a through hole is laminated on the second adhesive layer 30, but a display panel 150 having a through hole may be laminated on the first adhesive layer 20 and a glass layer or a plastic layer 140 may be laminated on the second adhesive layer 30. As described above, the through hole of the optical laminate is formed to have a position, size, number, and shape corresponding to a camera, a speaker, and various sensors mounted on the image display device. Not only the optical laminate but also the display panel has a through hole corresponding to the through hole of the optical laminate, so that the functions of the camera, the speaker, and various sensors can be fully exhibited without being hindered by the optical laminate and the display panel. Typically, a glass layer or a plastic layer 140 may be laminated on the first adhesive layer 20 of the optical laminate with an adhesive layer and disposed on the viewing side of the image display device.

[0052] As described above, in one embodiment, the through-hole is a through-hole that penetrates the optical laminate in a tapered shape. In this embodiment, the difference in size between the planar shape of the first through-hole and / or the planar shape of the second through-hole and the planar shape of the through-hole formed in the display panel in a plan view can be set to any appropriate value. The difference in size between the planar shape of the first through-hole and / or the planar shape of the second through-hole and the planar shape of the through-hole formed in the display panel in a plan view is preferably 500 μm or less, more preferably 300 μm or less, and even more preferably 100 μm or less. By the difference in size between the planar shape of the first through-hole and / or the planar shape of the second through-hole and the planar shape of the through-hole formed in the display panel in a plan view being within the above range, the width of the black frame printing can be reduced, and the designability can be improved. Note that the difference in size between the planar shape of the first through-hole and the planar shape of the through-hole formed in the display panel in a plan view and the difference in size between the planar shape of the second through-hole and the planar shape of the through-hole formed in the display panel in a plan view only need both differences to be within the above range, and they may be the same or different.

[0053] The image display device 200 may further include any other appropriate components. For example, any other appropriate components may be included between the first adhesive layer and the second adhesive layer of the optical laminate and the glass layer or plastic layer, or the display panel having through-holes. Examples of the other components include a retardation layer, an antireflection layer, a protective layer, a conductive film for a touch panel, a pressure-sensitive film, and the like. These other components are bonded to the optical laminate 100, the glass layer or plastic layer, or the display panel having through-holes via any appropriate adhesive layer or adhesive.

[0054] G-2. Method for manufacturing an image display device The image display device of the present invention is manufactured by any suitable method. In one embodiment, the method for manufacturing the image display device of the present invention includes a step of forming a through hole in an optical film, a step of forming a first adhesive layer on one surface of the optical film, a step of forming a through hole in the first adhesive layer, a step of forming a second adhesive layer on the other surface of the optical film, a step of forming a through hole in the second adhesive layer, a step of forming a through hole in the display panel, a step of laminating the display panel on one surface of the optical film, and a step of laminating a glass layer or a plastic layer on the other surface of the optical film.

[0055] As described above, the optical film, the first adhesive layer, and the second adhesive layer included in the image display device have through holes. These through holes may be formed in each of the optical film, the first adhesive layer, the second adhesive layer, and the display panel, and then the layers may be laminated, or the optical film, the first adhesive layer, the second adhesive layer, and the display panel may be laminated, and through holes may be formed in this laminate (that is, through holes may be formed in the optical film, the first adhesive layer, the second adhesive layer, and the display panel simultaneously). Preferably, the step of forming a through hole in the optical film, the step of forming a through hole in the first adhesive layer, the step of forming a through hole in the second adhesive layer, and the step of forming a through hole in the display panel are performed simultaneously. Examples of the method of forming through holes simultaneously include forming through holes in a state where the optical film, the first adhesive layer, the second adhesive layer, and the display panel are laminated.

[0056] In another embodiment, the image display device may be manufactured by laminating the above optical laminate and a display panel in which through-holes corresponding to the through-holes of the optical laminate are formed. In this embodiment, through-holes are also formed in the adhesive layer formed between the optical laminate and the display panel. The through-holes in the adhesive layer may be formed simultaneously with the display panel (in a state where the adhesive layer is laminated on the display panel), or an adhesive layer having through-holes separately formed in the optical laminate or the display panel may be bonded. The through-holes formed in the adhesive layer are formed at positions and sizes corresponding to the through-holes formed in the optical laminate and the display panel.

[0057] The adhesive layer can be formed by any suitable method. For example, it can be formed by the method described in F-1 above.

[0058] The above through-holes can be formed by any suitable method. For example, they can be formed by the method described in F-2 above. When forming through-holes in the adhesive layer, it is preferable to form the adhesive layer on any suitable substrate and / or separator, and form the through-holes in a state where the adhesive layer is sandwiched between the substrate and / or separator.

Examples

[0059] Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples. The evaluation items in the examples are as follows.

[0060] (1) Quality of through-holes The quality of the through-holes in the display panels of each example and comparative example was evaluated according to the following criteria. The state of the through-holes was visually confirmed. Best: The positions of the holes are aligned between the layers, and the non-display area can be reduced. Good: There is a slight deviation in the positions of the holes between the layers, and it can be put into practical use by increasing the non-display area. Unusable: The deviation in the positions of the holes is large and it cannot be put into practical use. (2) Suitability of the camera-corresponding part The image quality of the cameras of the display panels of each example and comparative example was evaluated according to the following criteria. Good: Through-holes are open in all layers including the panel except for the outermost layer, and light reflection at the interface can be prevented, resulting in good image quality and suitability for the camera corresponding part. Not acceptable: There is a layer without through-holes, and due to light reflection at the interface, the image quality is impaired and it is not suitable for the camera corresponding part. (3) Ease of production The manufacturing processes of the display panels of each example and comparative example were evaluated according to the following criteria. Best: The number of drilling operations is small, and through-hole alignment during lamination is not required. Good: The number of drilling operations is small, but it involves lamination that requires through-hole alignment. Not acceptable: The number of drilling operations is very large, and the number of laminations that require through-hole alignment is also large.

[0061] As the pressure-sensitive adhesive laminate A, a product manufactured by Nitto Denko Corporation, product name: CS9866US (product having a structure of a heavy release separator / pressure-sensitive adhesive layer A (thickness 150 μm, storage elastic modulus G' at 25°C: 0.14 MPa) / light release separator) was used. As the pressure-sensitive adhesive laminate B, a product manufactured by Nitto Denko Corporation, product name: CS9864US (product having a structure of a heavy release separator / pressure-sensitive adhesive layer B (thickness 100 μm, storage elastic modulus G' at 25°C: 0.14 MPa) / light release separator) was used.

[0062] Production Example 1: Preparation of Pressure-Sensitive Adhesive Composition 1 Into a separable flask equipped with a thermometer, a stirrer, a reflux condenser, and a nitrogen gas inlet tube, 99 parts by weight of butyl acrylate (BA), 1 part by weight of 4-hydroxybutyl acrylate (4HBA) as monomer components, 0.2 part by weight of azobisisobutyronitrile as a polymerization initiator, and ethyl acetate as a polymerization solvent were charged so that the solid content became 20%. Next, nitrogen gas was passed through, and nitrogen substitution was carried out for about 1 hour while stirring. Then, the flask was heated to 60 °C and reacted for 7 hours to obtain an acrylic polymer having a weight average molecular weight (Mw) of 1.1 million. To the above acrylic polymer solution (100 parts by weight of solid content), 0.8 part by weight of trimethylolpropane triisocyanate (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) as an isocyanate-based crosslinking agent and 0.1 part by weight of a silane coupling agent (KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.) were added to prepare an adhesive composition (solution).

[0063] Production Example 2: Preparation of Adhesive Laminate C The obtained adhesive solution was applied onto a polyethylene terephthalate-based release liner having a thickness of 38 μm or 50 μm so that the dried thickness became 20 μm, and heat-dried at 60 °C for 1 minute and then at 150 °C for 1 minute under normal pressure to prepare a laminate (adhesive laminate) having an adhesive layer C. This adhesive laminate was used as adhesive laminate C.

[0064] <Preparation of Polarizer> A laminate in which a polyvinyl alcohol (PVA) resin layer (thickness: 9 μm) was formed on an amorphous polyethylene terephthalate (PET) substrate was subjected to air-assisted stretching at a stretching temperature of 130 °C to prepare a stretched laminate. Next, the stretched laminate was dyed with iodine to obtain a colored laminate. Then, the colored laminate was stretched in boric acid water at a stretching temperature of 65 °C so that the total stretching ratio became 5.94 times, and a laminate having a PVA resin layer (polarizer) with a thickness of 5 μm stretched integrally with the amorphous PET substrate was prepared.

[0065] <Preparation of One-Side Protected Polarizing Plate> On the surface of the laminate having the above PVA resin layer on the polarizer side, a polyvinyl alcohol-based adhesive was applied so that the thickness of the adhesive layer became 0.1 μm, and a transparent protective film (a (meth)acrylic resin film having a lactone ring structure with a thickness of 20 μm and subjected to corona treatment (film b-1)) was laminated and dried at 50 °C for 5 minutes. Next, the amorphous PET substrate was peeled off to produce a single-sided protected polarizing plate.

[0066] <Example 1> The above adhesive laminate C was laminated on the polarizer of the above single-sided protected polarizing plate through the adhesive layer C. Next, one separator was peeled off from the above adhesive laminate A, and the peeled surface was laminated with the protective layer of the single-sided protective layer polarizing plate. A through-hole (circular, diameter 5 mm) was formed in the obtained optical laminate with an adhesive layer to obtain an optical laminate with an adhesive layer and a separator. Similarly, a through-hole (circular, diameter 5 mm) was formed at a position corresponding to the through-hole of the above optical laminate with an adhesive layer of the display panel (organic EL (OLED) panel). The separator was peeled off from the adhesive layer A of the optical laminate with an adhesive layer and a separator, and a cover glass (thickness 0.5 mm) was attached. Also, the separator was peeled off from the adhesive layer C, and a display panel having a through-hole formed so that the positions of the through-holes of the optical laminate with an adhesive layer and the display panel corresponded was attached to obtain an image display device 1.

[0067] <Example 2> A through-hole (circular, diameter 5 mm) was formed in the adhesive laminate A. The adhesive laminate C was laminated on the polarizer of the single-sided protected polarizing plate through the adhesive layer C. Next, the release liner was peeled off, and the display panel (OLED panel) was laminated through the adhesive layer C. Next, a through-hole (circular, diameter 5 mm) was formed at a position corresponding to the through-hole formed in the above adhesive laminate A to obtain a display panel with an optical laminate having a through-hole formed. Subsequently, one separator was peeled off from the adhesive layer laminate A, and a cover glass (thickness 0.5 mm) was bonded thereto. Next, the other separator of the adhesive laminate A was peeled off, and the through holes of the adhesive layer A and the through holes of the display panel with an optical laminate were aligned and bonded to obtain the image display device 2.

[0068] <Example 3> An adhesive laminate A with one separator peeled off was laminated on an optical film (manufactured by Nippon Zeon Co., Ltd., product name: ZF14-050) via the adhesive layer A. Next, an adhesive laminate B with one separator peeled off was laminated on the other surface of the optical film via the adhesive layer B to produce an optical film laminate. Through holes (circular, diameter 5 mm) were formed in the obtained optical film laminate to obtain an optical film laminate with through holes formed therein. Separately, an adhesive laminate C was laminated on the polarizer of a single-sided protective polarizing plate via the adhesive C, and then the separator was peeled off, and a display panel (OLED panel) was bonded thereto to obtain a display panel with an optical laminate. Next, through holes (circular, diameter 5 mm) were formed at positions corresponding to the through holes of the optical film laminate with through holes formed therein of the display panel with an optical laminate to obtain a display panel with an optical laminate with through holes formed therein. The separator was peeled off from the adhesive layer A of the optical film laminate with through holes formed therein, a cover glass (thickness 0.5 mm) was attached, then the separator was peeled off from the adhesive layer laminate B, and the optical film laminate with through holes formed therein and the display panel with an optical laminate with through holes formed therein were attached to each other with the through holes aligned to obtain the image display device 3.

[0069] <Example 4> An adhesive laminate A with one separator peeled off was bonded to one surface of an optical film (manufactured by Nippon Zeon Co., Ltd., product name: ZF14-050), and an adhesive laminate B with one separator peeled off was bonded to the other surface to obtain an optical film having an adhesive layer. Separately, an adhesive laminate C was laminated on the polarizer of a single-sided protective polarizing plate via the adhesive C, and then the separator was peeled off, and a display panel (OLED panel) was bonded thereto to obtain a display panel with an optical laminate. The separator was peeled off from the adhesive layer B of the optical film having the adhesive layer, and through the adhesive layer B, it was bonded to the polarizer of the display panel with the optical laminate. Next, through holes (circular, diameter 5 mm) were formed at predetermined positions of the bonded laminate. Next, the separator was peeled off from the adhesive layer A, and a cover glass (thickness 0.5 mm) was attached to obtain the image display device 4.

[0070] <Example 5> The above adhesive laminate C was bonded to the polarizer of the single-sided protective polarizer through the adhesive layer C to obtain a polarizer with an adhesive layer. Next, through holes (circular, diameter 5 mm) were formed at predetermined positions of the above polarizer with an adhesive layer, the adhesive laminate A, the adhesive laminate B, the touch screen panel (TSP), and the display panel (OLED panel), respectively. Thereafter, each layer with the through hole formed therein and the cover glass (thickness 0.5 mm) were laminated in the order of cover glass / adhesive layer A / TSP / adhesive layer B / protective layer / polarizer / adhesive layer C / display panel to obtain the image display device 5. Note that the layers having through holes were bonded so that the positions of the respective through holes corresponded to each other.

[0071] <Example 6> An image display device 6 was obtained in the same manner as in Example 3 except that the arrangement of the image display device was cover glass / adhesive layer A / protective layer / polarizer / adhesive layer C / TSP / adhesive layer B / display panel.

[0072] <Example 7> The above adhesive laminate C was bonded to the polarizer of the single-sided protective polarizer through the adhesive layer C to obtain a polarizer with an adhesive layer. Next, one separator was peeled off from the above adhesive laminate A, and the peeled surface was bonded to the protective layer of the single-sided protective layer polarizer. Thereafter, the separator was peeled off from the adhesive layer C, the display panel (OLED panel) was bonded, and through holes (circular, diameter 5 mm) were formed at predetermined positions. Thereafter, the separator was peeled off, and a cover glass (thickness 0.5 mm) was laminated through the adhesive layer A to obtain the image display device 7.

[0073] <Example 8> The pressure-sensitive adhesive laminate C was bonded to the polarizer of the single-sided protective polarizing plate through the pressure-sensitive adhesive layer C to obtain a polarizing plate with a pressure-sensitive adhesive layer. Subsequently, the separator was peeled off from the pressure-sensitive adhesive layer C, and the polarizer and the display panel (OLED panel) were bonded together through the pressure-sensitive adhesive layer C. Next, the pressure-sensitive adhesive laminate B, TSP, and the pressure-sensitive adhesive laminate A were sequentially laminated on the protective layer side of the polarizing plate with a pressure-sensitive adhesive layer to obtain a laminate laminated in the order of pressure-sensitive adhesive layer A / TSP / pressure-sensitive adhesive layer B / protective layer / polarizer / pressure-sensitive adhesive layer C / display panel. A through hole (circular, 5 mm in diameter) was formed at a predetermined position of this laminate. Thereafter, the separator was peeled off from the laminate with the through hole formed, and a cover glass (0.5 mm thick) was laminated through the pressure-sensitive adhesive layer a to obtain an image display device 8.

[0074] (Comparative Example 1) A through hole (circular, 5 mm in diameter) was formed in the display panel (OLED panel). Separately, the pressure-sensitive adhesive laminate C was bonded to the polarizer of the single-sided protective polarizing plate through the pressure-sensitive adhesive layer C to obtain a polarizing plate with a pressure-sensitive adhesive layer. The separator was peeled off from the pressure-sensitive adhesive layer C of the polarizing plate with a pressure-sensitive adhesive layer and bonded to the display panel with the through hole formed. Next, the pressure-sensitive adhesive laminate A was bonded to the protective layer of the polarizing plate with a pressure-sensitive adhesive layer, and a cover glass (0.5 mm thick) was laminated through the pressure-sensitive adhesive layer A to obtain an image display device C1.

[0075] (Comparative Example 2) A through hole (circular, 5 mm in diameter) was formed in the display panel (OLED panel). Separately, the pressure-sensitive adhesive laminate C was bonded to the polarizer of the single-sided protective polarizing plate through the pressure-sensitive adhesive layer C to obtain a polarizing plate with a pressure-sensitive adhesive layer. The separator was peeled off from the pressure-sensitive adhesive layer C of the polarizing plate with a pressure-sensitive adhesive layer and bonded to the display panel with the through hole formed. Next, the pressure-sensitive adhesive laminate B was bonded to the protective layer of the polarizing plate with a pressure-sensitive adhesive layer, and TSP was laminated through the pressure-sensitive adhesive layer B. Thereafter, the pressure-sensitive adhesive laminate A was laminated on TSP, and a cover glass (0.5 mm thick) was laminated through the pressure-sensitive adhesive layer A to obtain an image display device C2.

[0076]

Table 1

[0077] <Examples 9 to 11> (Comparative Example 3) A through-hole (circular, 5 mm in diameter) was formed at a predetermined position of the single-sided protective polarizing plate. Next, through-holes were respectively formed in the pressure-sensitive adhesive laminate A and the pressure-sensitive adhesive laminate C such that the distances from the through-holes formed in the single-sided protective polarizing plate to the ends were the values described in Table 2. Next, one separator was peeled off from the pressure-sensitive adhesive laminate A and the pressure-sensitive adhesive laminate C, and they were bonded together so that the centers of the through-holes formed in the pressure-sensitive adhesive layer and the through-holes formed in the polarizing plate were aligned, and an optical laminate (separator / pressure-sensitive adhesive layer A / protective layer / polarizer / pressure-sensitive adhesive layer C / separator) was obtained. The through-holes of the obtained optical laminate were visually confirmed from the pressure-sensitive adhesive layer A side, and the presence or absence of the protrusion of the pressure-sensitive adhesive layer was evaluated.

[0078]

Table 2

[0079] <Example 12> One separator was peeled off from the pressure-sensitive adhesive laminate B, and the pressure-sensitive adhesive layer B was laminated on the protective layer side of the single-sided protective polarizing plate. A pressure-sensitive adhesive laminate D was obtained in the same manner as in Production Example 2 except that the coating was performed so that the thickness after drying was 25 μm. One separator was peeled off from the obtained pressure-sensitive adhesive laminate D, and the pressure-sensitive adhesive layer D was laminated on the polarizer of the single-sided protective polarizing plate. A through-hole (circular, 5 mm in diameter) was formed at a predetermined position of the obtained laminate of separator / pressure-sensitive adhesive layer B / protective layer / polarizer / pressure-sensitive adhesive layer D / separator to obtain an optical laminate.

[0080] <Example 13> An optical laminate was produced in the same manner as in Example 12 except that the pressure-sensitive adhesive laminate A was used instead of the pressure-sensitive adhesive laminate B, a retardation film (50 μm thick) was used instead of the single-sided protective polarizing plate, and the pressure-sensitive adhesive laminate E produced in the same manner as in Production Example 2 except that the coating was performed so that the thickness after drying was 100 μm was used.

[0081] <Example 14> An optical laminate was produced in the same manner as in Example 12, except that a transparent film (thickness: 50 μm) was used instead of the single-sided protective polarizing plate, and the coating was applied so that the thickness after drying would be 50 μm, and an adhesive laminate F produced in the same manner as in Production Example 2 was used.

[0082] (Comparative Example 4) A through-hole (circular, diameter: 5 mm) was formed at a predetermined position of the adhesive laminate B to obtain a laminate.

[0083] Using the laminates having through-holes obtained in Examples 12 to 14 and Comparative Example 4, the following evaluations were performed. After processing the diameter of the through-hole of the laminate obtained in Examples 12 to 14 and Comparative Example 4, immediately after peeling off one separator, and after laminating it on the panel, the roundness was calculated by the following formula from the obtained values. The diameter of the through-hole was the value of the portion where the diameter value was the largest as the diameter of the through-hole. The results are shown in Table 3. Roundness = Designed diameter of the through-hole / Measured diameter of the through-hole

[0084]

Table 3

[0085] <Examples 15 to 17> (Comparative Examples 5 to 6) One separator was peeled off from the above adhesive laminate A, and the adhesive layer A was laminated on the protective layer of the above single-sided protective polarizing plate. Next, one separator was peeled off from the adhesive laminate C, and the adhesive layer C was laminated on the polarizer of the single-sided protective polarizing plate to obtain an optical laminate. The diameter of the through-hole (the surface on the separator side) on the outermost surface of the adhesive layer A was designated as φ1, and the diameter of the through-hole (the surface on the separator side) on the outermost surface of the adhesive layer C was designated as φ2, and a tapered through-hole was formed so that φ1 and φ2 would be the values described in Table 4 to obtain an optical laminate having a through-hole. Separately, a black frame having the outer diameter, inner diameter, and width described in Table 4 was printed on a panel. Next, the separator of the adhesive layer C was peeled off, and alignment was performed so that the center of the through-hole would coincide with the center of the black frame printed on the panel, and the optical laminate and the panel were laminated.

[0086] For the laminates of Examples 15 to 17 and Comparative Examples 5 to 6, the following evaluations were performed. (Appearance) The through-holes of the obtained laminate were visually confirmed from the visual recognition side (adhesive layer A side), and it was evaluated whether the cut surface of the hole and the cut surface of the display area could be visually recognized. (Wide-angle conversion) A camera module was arranged on the panel side of the obtained laminate in alignment with the through-hole, and the degree of wide-angle conversion was evaluated from the captured image according to the following criteria. Best: The imaging area is wide, the cut surface of the through-hole does not enter the imaging area at all, and it does not interfere with image capture. Good: The imaging area is slightly narrower, the cut surface of the through-hole does not enter the imaging area, and it does not interfere with image capture. Fair: The imaging area is narrower, the cut surface of the through-hole does not enter the imaging area, and it does not interfere with image capture. Poor: The imaging area is narrow and the cut surface of the through-hole is included in the imaging area. (Design) The design of the through-hole was evaluated according to the following criteria. Best: No black frame can be visually recognized from the through-hole. Good: A black frame can be slightly visually recognized from the through-hole. Fair: A black frame can be visually recognized to such an extent that it does not interfere with the design. Poor: A black frame can be clearly visually recognized from the through-hole, and the size corresponding to the camera counterpart is smaller than the designed size of the through-hole.

[0087] [Table 4]

[0088] (Examples 18 to 20) (Comparative Example 7) One separator was peeled off from the above adhesive laminate A, and the adhesive layer A was laminated on the protective layer of the above one-sided protective polarizing plate. Next, one separator was peeled off from the adhesive laminate C, and the adhesive layer C was laminated on the polarizer of the one-sided protective polarizing plate to obtain an optical laminate. The diameter of the through-hole (the surface on the separator side) on the outermost surface of the adhesive layer A was designated as φ1, and the diameter of the through-hole (the surface on the separator side) on the outermost surface of the adhesive layer C was designated as φ2. A tapered through-hole was formed so that φ1 and φ2 would be the values described in Table 4, and an optical laminate having a through-hole was obtained. Separately, a black frame having the outer diameter, inner diameter, and width described in Table 5 was printed on a panel. Next, the separator of the adhesive layer C was peeled off, and alignment was performed so that the center of the through-hole would coincide with the center of the black frame printed on the panel, and the optical laminate and the panel were laminated.

[0089] The following evaluations were performed on the laminates of Examples 18 to 20 and Comparative Example 7. (Interference) A camera module was arranged on the panel side of the obtained laminate in alignment with the through-hole, and the presence or absence of interference of the camera module with the through-hole was evaluated according to the following criteria. The results are shown in Table 5. Best: The camera module does not contact the through-hole, and the distance between the camera module and the visible side surface of the optical laminate can be shortened. Good: Although the camera module contacts the through-hole, the distance between the camera module and the visible side surface of the optical laminate can be shortened without affecting the photographing function.

[0090]

Table 5

[0091] <Examples 21 to 23> (Comparative Example 8) One separator was peeled off from the above adhesive laminate A, and the adhesive layer A was laminated on the protective layer of the above one-sided protective polarizing plate. Next, one separator was peeled off from the adhesive laminate C, and the adhesive layer C was laminated on the polarizer of the one-sided protective polarizing plate to obtain an optical laminate. The diameter of the through-hole (the surface on the separator side) on the outermost surface of the adhesive layer A was designated as φ1, and the diameter of the through-hole (the surface on the separator side) on the outermost surface of the adhesive layer C was designated as φ2. A tapered through-hole was formed such that φ1 and φ2 became the values described in Table 6, and an optical laminate having a through-hole was obtained. Separately, a black frame having the outer diameter, inner diameter, and width described in Table 6 was printed on a panel. Next, the separator of the adhesive layer C was peeled off, and alignment was performed so that the center of the through-hole and the center of the black frame printed on the panel coincided with each other, and the optical laminate and the panel were laminated.

[0092] The following evaluations were performed on the laminates of Examples 21 to 23 and Comparative Example 8. The results are shown in Table 6. (Visibility of the edge) The through-hole was visually confirmed from the viewing side, and it was evaluated whether the edge of the through-hole cut surface could be seen from the through-hole. In any of the examples and comparative examples, the edge could not be seen visually, which was the best result. (Width of the black frame) How much the opening of the through-hole was affected by the black frame was evaluated according to the following criteria. Best: The edge of the black frame could not be visually recognized from the through-hole, and it did not interfere with the wide-angle conversion of the camera. Good: Although the edge of the black frame could be visually recognized from the through-hole, it did not interfere with the wide-angle conversion of the camera. Fair: Although the width portion of the black frame could be visually recognized from the through-hole, it did not interfere with the wide-angle conversion of the camera to such an extent. Poor: The black frame could be visually recognized from the opening of the through-hole, and the wide-angle conversion of the camera could not be performed.

[0093]

Table 6

Industrial Applicability

[0094] The optical laminate of the present invention is suitably used in image display devices such as liquid crystal display devices and organic EL devices.

Explanation of reference numerals

[0095] 10 Optical film 20 First adhesive layer 30 Second adhesive layer 40 Separator 50 Through-hole 100 Optical laminate with adhesive layer 140 Glass layer or plastic layer 150 Display panel 200 Image display device

Claims

1. An optical film, a first adhesive layer formed on one surface of the optical film, a second adhesive layer formed on the other surface of the optical film, and having a through hole that integrally penetrates the first adhesive layer, the optical film, and the second adhesive layer, An optical laminate with an adhesive layer, wherein the planar size of the through holes formed in the first adhesive layer and the second adhesive layer is larger than the size of the through holes formed in the optical film.

2. The optical laminate with an adhesive layer according to claim 1, wherein the optical film is at least one selected from the group consisting of a polarizing plate, a retardation film, a conductive film for a touch panel, a pressure-sensitive film, and a transparent plastic film.

3. The optical laminate with an adhesive layer according to claim 1, a display panel disposed on one surface of the optical laminate with an adhesive layer and having a through hole in a portion corresponding to the through hole of the optical laminate with an adhesive layer, and a glass layer or a plastic layer disposed on the other surface of the optical laminate with an adhesive layer. An image display device.

4. The image display device according to claim 3, wherein the through hole of the optical laminate with an adhesive layer and the through hole of the display panel are through holes that integrally penetrate the optical laminate and the display panel.

5. A step of forming a through hole in the optical film, a step of forming a first adhesive layer on one surface of the optical film, a step of forming a through hole in the first adhesive layer, a step of forming a second adhesive layer on the other surface of the optical film, a step of forming a through hole in the second adhesive layer, a step of forming a through hole in the display panel, and a step of laminating the display panel on one surface of the optical film. A method for manufacturing an image display device, comprising a step of laminating a glass layer or a plastic layer on the other surface of the optical film. A method for manufacturing an image display device, wherein the size of the planar shape of the through holes formed in the first adhesive layer and the second adhesive layer is larger than the size of the through holes formed in the optical film.

6. The manufacturing method according to claim 5, wherein the step of forming through holes in the optical film, the step of forming through holes in the first adhesive layer, the step of forming through holes in the second adhesive layer, and the step of forming through holes in the display panel are performed simultaneously.

Images