WO2020179371A1

WO2020179371A1 - Stack and image display device

Info

Publication number: WO2020179371A1
Application number: PCT/JP2020/005104
Authority: WO
Inventors: 一雨朴
Original assignee: 住友化学株式会社
Priority date: 2019-03-04
Filing date: 2020-02-10
Publication date: 2020-09-10
Also published as: JP2020144455A; KR20210134669A; TW202105147A; CN113508315A

Abstract

The purpose of the present invention is to provide a stack which includes a polarizing layer, a coloring layer, and a touch sensor layer, wherein the difference between a display region and a non-display region is unnoticeable when an image display device in a power-off state is seen from a viewing side. Provided is a stack which includes, in order, a polarizing layer, a bonding layer, and a touch sensor layer, wherein the touch sensor layer has wiring and a coloring layer, the stack is divided into a display region and a non-display region in plan view, and the coloring layer is formed in the non-display region and is disposed more toward the polarizing layer than the wiring.

Description

Laminated body and image display device

The present invention relates to a laminate and an image display device.

Patent Document 1 describes a touch panel in which a colored layer is provided on a touch sensor layer. The colored layer can have not only a design function of the image display device but also a function as a shielding layer that forms a non-display area.

Patent Document 2 describes a touch screen panel having a touch plate capable of touching the front surface, a laminate including a transparent electrode, and a display substrate, and the touch plate or the display substrate so that the printed layer is fitted. It is described that a recess is formed in the.

Korean Publication No. 10-2019-0075666 Korean Publication No. 10-2013-0141780

The present invention is a laminated body including a polarizing layer, a colored layer, and a touch sensor layer, and the color difference between the display area and the non-display area becomes inconspicuous when the image display device in the power-off state is viewed from the visual side. It is intended to provide a laminate.

The present invention provides the following laminate and image display device.
[1] A laminate having a polarizing layer, a bonded layer, and a touch sensor layer in this order.
The touch sensor layer includes wiring and a colored layer.
The laminated body is divided into a display area and a non-display area in a plan view.
The colored layer is a laminated body provided in the non-display region and arranged on the polarizing layer side of the wiring.
[2] The laminate according to [1], wherein both absolute values Δa ^* and Δb ^* of color difference between the display area and the non-display area when viewed from the polarizing layer side are 0.3 or less.
[3] The laminate according to [1] or [2], wherein the colored layer contains carbon black.
[4] The laminated body according to any one of [1] to [3], wherein a step difference between the display region and the non-display region on the outermost surface when viewed from the touch sensor layer side is 3 μm or less.
[5] The laminate according to any one of [1] to [4], wherein the colored layer has a thickness of 2 μm or less and an optical density of 4 or more.
[6] The laminate according to any one of [1] to [5], further including an organic EL display element on the outermost surface of the touch sensor layer side.
[7] An image display device including the laminate according to any one of [1] to [6].
[8] The method for producing a laminate according to any one of [1] to [6].
The process of preparing the polarizing layer and
The process of preparing the touch sensor layer and
Including a step of laminating the polarizing layer and the touch sensor layer via a laminating layer, the step of preparing the touch sensor layer has a colored layer forming step of forming a colored layer by a photolithography method, Production method.

According to the present invention, it is a laminated body including a polarizing layer, a colored layer, and a touch sensor layer, and when the image display device in a power-off state is viewed from the visual side, the color difference between the display area and the non-display area is large. A discreet laminate can be provided. The user of the image display device including such a laminate visually recognizes the non-display area as if it is the display area, and thus can feel the display area largely.

It is a schematic sectional drawing which shows the laminated body by one Embodiment of this invention. It is a top view of the laminated body seen from the polarizing layer side. It is a schematic sectional drawing which shows the laminated body by one Embodiment of this invention. It is the schematic which shows typically about the explanation of the position accuracy. It is the schematic sectional drawing which shows typically the manufacturing method of the laminated body. It is a schematic sectional drawing which shows the manufacturing method of a laminated body typically. It is the schematic sectional drawing which shows typically the manufacturing method of the laminated body.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In all the drawings below, the scales are appropriately adjusted and shown in order to make each component easier to understand, and the scale of each component shown in the drawings does not necessarily match the scale of the actual component.

[Laminate]
FIG. 1 is a schematic cross-sectional view of a laminate according to one embodiment of the present invention. The laminated body 100 of this embodiment includes a polarizing layer 101, a bonding layer 102, and a touch sensor layer 103 in this order from the viewing side. The touch sensor layer 103 includes a wiring 104 and a colored layer 105. The stacked body 100 is divided into a display area A and a non-display area B in a plan view, and the colored layer 105 is provided in the non-display area B and is arranged closer to the polarizing layer 101 side than the wiring 104. The wiring 104 can be provided in the non-display area B. In the present specification, the plan view means viewing from the thickness direction of the layer.

According to the study by the present inventor, the touch sensor layer 103 includes the wiring 104 and the coloring layer 105, and the coloring layer 105 is provided in the non-display area B and is arranged closer to the polarizing layer 101 than the wiring 104. In an image display device including the laminate 100 with the polarizing layer 101 on the viewing side, when the image display device in the power-off state is viewed from the viewing side, the difference in color between the display region and the non-display region (hereinafter, “ It was found that the "difference in visibility" can be made inconspicuous. When the coloring layer is formed on the front surface side of the polarizing layer or on the front surface side of the polarizing plate, the user of the image display device directly visually recognizes the color of the coloring layer. The difference from the color of is more noticeable. When the colored layer is formed on the surface of the polarizing layer on the side of the touch sensor layer, the user of the image display device visually recognizes the smooth surface of the colored layer. The color difference from the layer becomes noticeable. On the other hand, in the laminate of the present invention, the touch sensor layer including the coloring layer is arranged on the side opposite to the front plate side with respect to the polarizing layer. The user of the image display device visually recognizes the colored layer through the polarizing layer.
Further, the colored layer is arranged apart from the polarizing layer. At this time, since the color of the colored layer approaches the color of the polarizing layer, it is considered that the difference in visibility is alleviated. The user of the image display device including the laminate of the present invention visually recognizes the non-display area as if it is the display area, and thus can feel the display area larger than the actual size.

FIG. 2 is a top view of the laminated body 100 as seen from the polarizing layer 101 side. The absolute values Δa ^* and Δb ^* of the difference between the hues a ^* and b ^* between the display area A and the non-display area B when viewed from the polarizing layer side (hereinafter, also referred to as color difference) are both visible differences. From the viewpoint of making it smaller, it can be, for example, 0.3 or less. The colored layer 101 can be black from the viewpoint of reducing the color difference between the display area A and the non-display area B. This is because the polarizing layer is often manufactured so that its color is neutral gray. The colored layer 101 preferably contains carbon black from the viewpoint of reducing the color difference between the display area A and the non-display area B. The color difference is preferably 0.2 or less, more preferably 0.15 or less. .Delta.a ^* and [Delta] b ^* is the display area ^A ^L ^* ^a * ^b * coordinates ^a _* A in the color space (CIE ^1976), the ^b _{* A} and a non-display region B ^L ^* ^a * ^b * color space (CIE 1976) It is the absolute value of the difference between the coordinates a ^* _B and b ^* _{B at,} and can be obtained by the following formula.
Δa ^* =|a ^* _A- a ^* _B |
Δb ^* =|b ^* _A- b ^* _B |

The laminated body 100 preferably has a step (hereinafter, sometimes abbreviated as "step") between the display area and the non-display area on the outermost surface when viewed from the touch sensor layer 103 side of 3 μm or less. When the step is 3 μm or less, the generation of air bubbles due to the step is suppressed when the touch sensor layer of the laminated body and the display portion are joined, and the bonding with the organic EL display element tends to be good. The step difference is preferably 2 μm or less, more preferably 1 μm or less, and further preferably 0.5 μm or less from the viewpoint of preventing the occurrence of defects in the joining process.

For example, a method of setting the thickness of the colored layer 105 to 2 μm or less can be used to set the above step difference to 3 μm or less. In order to reduce the above-mentioned step, the thickness of the colored layer 105 may be reduced. On the other hand, when the thickness of the colored layer 105 is reduced, the optical density tends to decrease and the shielding property tends to be impaired. Therefore, the present inventor sets the thickness of the colored layer 105 to 2 μm or less and the optical density to 4 or more so that the step is 3 μm or less without impairing the shielding property of the wiring 104 by the colored layer 105. It was found that it could be done. The colored layer 105 preferably has a thickness of 2 μm or less and an optical density of 4 or more. The optical density may be 7 or less, or 6 or less. The optical density of the colored layer is measured by an optical density measuring device, and specifically, it is measured by the method described in Examples described later.

In order to set the thickness and optical density of the colored layer 105 within the above ranges, for example, a method of forming the colored layer 105 using a composition for forming a colored layer by a photolithography method can be mentioned. This is because the photolithography method makes it easier to use the composition for forming a coloring layer having a larger content of the coloring agent and the optical density per unit thickness of the coloring layer 105 can be increased more easily than the printing method.

The thickness of the laminated body 100 is not particularly limited because it varies depending on the function required for the laminated body 100, the application of the laminated body 100, and the like, but may be, for example, 20 μm or more and 1000 μm or less, preferably 25 μm or more and 500 μm or less. More preferably, it is 30 μm or more and 300 μm or less.

The laminated body 100 may have, for example, a rectangular shape in a plan view, preferably a rectangular shape having a long side and a short side, and more preferably a rectangular shape. When the laminated body 100 has a rectangular shape in a plan view, the long side may have a length of, for example, 10 mm or more and 1400 mm or less, and preferably 50 mm or more and 600 mm or less. The length of the short side is, for example, 5 mm or more and 800 mm or less, preferably 30 mm or more and 500 mm or less, and more preferably 50 mm or more and 300 mm or less.

When the laminated body 100 has a rectangular shape in a plan view, the length of each side in each layer constituting the laminated body 100 may be the same as each other. The corners of each of the layers constituting the laminated body 100 may be rounded, the ends may be cut out, or the holes may be punched.

The laminated body 100 is preferably bendable. The term “bendable” means that a bend radius of 2.5 mm is possible. More preferably, the laminate 100 does not crack even when the inner surface of the laminate 100 has a bending radius of 2.5 mm and the number of bends is 10,000.

The laminated body 100 may further have a front plate on the outermost surface on the polarizing layer 101 side. The laminated body 100 may further include an organic EL display element on the outermost surface on the touch sensor 103 side.

FIG. 3 is a schematic sectional view of a laminated body according to another embodiment of the present invention. In the laminate 200 of the present embodiment, the front plate 201, the bonding layer 202, the polarizing layer 101, the bonding layer 102, the touch sensor layer 103, the bonding layer 203, and the organic EL display element 204 are arranged in this order from the visual side. Prepare The touch sensor layer 103 includes a wiring 104 and a coloring layer 105, and a base material layer 111 is stacked.

The laminated body 100 can be used, for example, in an image display device or the like. The image display device is not particularly limited, and examples thereof include an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electroluminescence display device. When the laminated body 100 has flexibility, the laminated body 100 is suitable for a flexible display.

[Polarizing layer]
The polarizing layer 101 may be a linearly polarized light layer, or may be a combination of a linearly polarized light layer and a retardation layer. Examples of the linear polarization layer include a stretched film or a stretched layer having a dichroic dye adsorbed thereon, or a film containing a film obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound as a polarizer. Be done. As the dichroic dye, specifically, iodine or a dichroic organic dye is used. For dichroic organic dyes, C.I. I. Included are dichroic direct dyes composed of disazo compounds such as DIRECT RED 39 and dichroic direct dyes composed of compounds such as trisazo and tetrakisazo.

The film obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound is a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal. Examples thereof include a film containing a cured product of a polymerizable liquid crystal compound such as a layer obtained by coating and curing.
A film obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound is preferable because it has no limitation in the bending direction as compared with a stretched film or a stretched layer having a dichroic dye adsorbed thereon. Therefore, in order to obtain a laminate in which at least one direction in the plane and a direction orthogonal thereto, and further, in all directions in the plane, the number of times of bending without cracks when the above-mentioned repeated bending is within the above range is obtained. As the linearly polarizing layer, a film containing, as a polarizer, a film obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound is preferable.

(1) Linearly polarizing layer including a polarizer that is a stretched film or a stretched layer A polarizer that is a stretched film having a dichroic dye adsorbed is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, a polyvinyl alcohol-based resin. And a step of adsorbing the dichroic dye by dyeing the film with the dichroic dye, and a step of treating the polyvinyl alcohol-based resin film on which the dichroic dye is adsorbed with an aqueous boric acid solution, and boric acid It can be manufactured through a step of washing with water after treatment with an aqueous solution. Such a polarizer may be used as it is as a linear polarizing layer, or one having a transparent protective film laminated on one side or both sides may be used as a linear polarizing layer. The thickness of the polarizer is preferably 2 μm or more and 40 μm or less.

Polyvinyl alcohol resin is obtained by saponifying polyvinyl acetate resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides having an ammonium group.

The saponification degree of the polyvinyl alcohol resin is usually 85 to 100 mol %, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes can also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 or more and 10000 or less, preferably 1500 or more and 5000 or less.

The polarizer, which is a stretched layer having a dichroic dye adsorbed, is usually a step of applying a coating solution containing the polyvinyl alcohol resin onto a base film, a step of uniaxially stretching the obtained laminated film, and a uniaxial stretching. By dyeing the polyvinyl alcohol-based resin layer of the laminated film with a dichroic dye, the step of adsorbing the dichroic dye to form a polarizer, the film on which the dichroic dye is adsorbed with an aqueous boric acid solution. It can be manufactured through a treatment step and a step of washing with water after treatment with an aqueous solution of boric acid.
If necessary, the base film may be peeled and removed from the polarizer. The material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described later.

The polarizing film, which is a stretched film or a stretched layer, may be incorporated into an optical laminate in a form in which a thermoplastic resin film is bonded to one side or both sides thereof. This thermoplastic resin film can function as a protective film for a polarizer or a retardation film.
The thermoplastic resin film is, for example, a polyolefin resin such as a chain polyolefin resin (such as a polypropylene resin) or a cyclic polyolefin resin (such as a norbornene resin); a cellulose resin such as triacetyl cellulose; a polyethylene terephthalate or a polyethylene resin. A film made of a polyester resin such as phthalate or polybutylene terephthalate; a polycarbonate resin; a (meth) acrylic resin; or a mixture thereof can be used.
From the viewpoint of thinning, the thickness of the thermoplastic resin film is usually 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less, still more preferably 80 μm or less, still more preferably 60 μm or less. And usually 5 μm or more, preferably 20 μm or more.
The thermoplastic resin film may or may not have a retardation.
The thermoplastic resin film can be attached to the polarizer using an adhesive layer, for example.

(2) Linearly polarizing layer provided with a film obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound as a polarizer A composition containing the dichroic dye and a polymerizable compound is applied and cured As the film, a composition containing a polymerizable dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal is a base film (or an alignment film formed on the base film). Examples thereof include a film containing a cured product of a polymerizable liquid crystal compound such as a layer obtained by applying the composition to and curing.
The film may be used as a linearly polarizing layer by peeling off the substrate or together with the substrate.
The material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described above.
A film obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound may be incorporated into a laminate in a form in which a thermoplastic resin film is attached to one side or both sides of the film. As the thermoplastic resin film, the same thermoplastic resin film that can be used for the polarizer that is a stretched film or a stretched layer can be used.
The thermoplastic resin film can be attached to the polarizer using an adhesive layer, for example.
Specific examples of the film formed by coating and curing a composition containing a dichroic dye and a polymerizable compound include those described in JP2013-37353A and JP2013-33249A. To be

The thickness of the film obtained by applying and curing the composition containing the dichroic dye and the polymerizable compound is usually 10 μm or less, preferably 0.5 μm or more and 8 μm or less, and more preferably 1 μm or more and 5 μm or less. ..

The thickness of the polarizing layer 101 is, for example, 2 μm or more and 100 μm or less, preferably 10 μm or more and 60 μm or less.

The polarizing layer 101 may further include a retardation layer. The retardation layer may include one layer or two or more retardation layers. The retardation layer may be a positive A plate such as a λ/4 plate or a λ/2 plate, and a positive C plate. The retardation layer may be formed of the resin film exemplified as the material of the protective film described above, or may be formed of a layer in which a polymerizable liquid crystal compound is cured. The polarizing layer 101 may further include an alignment film and a base film.

When the linear polarizing layer and the retardation layer are arranged so that the absorption axis of the linear polarizing layer and the slow axis of the retardation layer are at a predetermined angle, the polarizing layer 101 has an antireflection function, that is, a circle. It can function as a polarizing plate. When the retardation layer includes a λ/4 plate, the angle formed by the absorption axis of the linear polarizing layer and the slow axis of the λ/4 plate may be 45°±10°.

When the polarizing layer 101 includes a retardation layer, the polarizing layer 101 and the retardation layer can be bonded together via a bonding layer described below. The thickness of the bonding layer may be, for example, 0.5 μm or more and 25 μm or less, and preferably 1 μm or more and 25 μm or less.

The laminated body 100 can prevent reflection of external light by including a circularly polarizing plate as the polarizing layer 101. The thickness of the circularly polarizing plate is, for example, 10 μm or more and 200 μm or less, preferably 10 μm or more and 100 μm or less.

[Laminating layer]
The bonding layer 102 is a layer interposed between the polarizing layer 101 and the touch sensor layer 103, and may be, for example, an adhesive layer or an adhesive layer. The laminating layer 102 can be a layer for laminating the polarizing layer and the touch sensor layer 103, or a layer for laminating a front plate and a polarizing plate described below. The bonding layer 102 is preferably a pressure-sensitive adhesive layer from the viewpoint of absorbing the step difference of the colored layer 105. The laminate 100 may include one laminating layer or two or more laminating layers. Further, one pressure-sensitive adhesive layer may be composed of one layer or two or more layers. When the optical layered body includes a plurality of bonding layers 20, the plurality of bonding layers may be the same kind or may be different kinds.

The pressure-sensitive adhesive layer can be composed of a pressure-sensitive adhesive composition containing a resin such as (meth)acrylic, rubber-based, urethane-based, ester-based, silicone-based, or polyvinyl ether-based resin as a main component. Above all, a pressure-sensitive adhesive composition containing a (meth)acrylic resin as a base polymer, which is excellent in transparency, weather resistance, heat resistance, etc., is preferable. The pressure-sensitive adhesive composition may be an active energy ray curable type or a thermosetting type.

Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth) acrylic acid, ethyl (meth) acrylic acid, isooctyl (meth) acrylic acid, and 2- (meth) acrylic acid. A polymer or copolymer having one or more kinds of (meth)acrylic acid ester such as ethylhexyl as a monomer is preferably used. It is preferable that the base polymer is copolymerized with a polar monomer. Examples of the polar monomer include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, and glycidyl (). Examples thereof include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like such as (meth)acrylate.

The pressure-sensitive adhesive composition may contain only the above-mentioned base polymer, but usually further contains a crosslinking agent. As the cross-linking agent, a metal ion having a valence of 2 or more and forming a carboxylic acid metal salt with a carboxyl group; a polyamine compound forming an amide bond with a carboxyl group; Examples thereof include epoxy compounds and polyols that form an ester bond with a carboxyl group; and polyisocyanate compounds that form an amide bond with a carboxyl group. Of these, polyisocyanate compounds are preferable.

The active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by being irradiated with an active energy ray such as an ultraviolet ray or an electron beam, and has adhesiveness even before irradiation with the active energy ray. It is a pressure-sensitive adhesive composition having a property that it can be brought into close contact with an adherend such as the above, and can be cured by irradiation with an active energy ray to adjust the adhesive force. The active energy ray-curable pressure-sensitive adhesive composition is preferably UV-curable. The active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. Further, if necessary, a photopolymerization initiator, a photosensitizer or the like may be contained.

The pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, pressure-sensitive imparting agents, and fillers (metal powders and other inorganic powders). Etc.), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, defoamers, corrosion inhibitors, photopolymerization initiators, and other additives.

It can be formed by applying an organic solvent diluent of the pressure-sensitive adhesive composition onto a substrate and drying. When the active energy ray-curable pressure-sensitive adhesive composition is used, the formed pressure-sensitive adhesive layer can be irradiated with an active energy ray to obtain a cured product having a desired degree of curing.

As the adhesive layer, a water-based adhesive or an active energy ray curable adhesive can be used. Examples of the water-based adhesive include an adhesive composed of a polyvinyl alcohol-based resin aqueous solution and a water-based two-component urethane-based emulsion adhesive.

The active energy ray-curable adhesive refers to an adhesive that cures by irradiating with active energy rays such as ultraviolet rays, and includes, for example, a polymerizable compound and a photopolymerization initiator, a photoreactive resin, and the like. Examples include those containing a binder resin and a photoreactive crosslinking agent. Examples of the polymerizable compound include a photopolymerizable monomer such as a photocurable epoxy monomer, a photocurable (meth) acrylic monomer, and a photocurable urethane monomer, and an oligomer derived from the photopolymerizable monomer. Examples of the photopolymerization initiator include those containing a substance that generates active species such as neutral radicals, anion radicals, and cation radicals by irradiation with active energy rays such as ultraviolet rays. As the active energy ray curable adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photocurable epoxy monomer and a photocationic polymerization initiator can be preferably used.

From the viewpoint of reducing the step, the thickness of each bonded layer is, for example, 3 μm or more and 100 μm or less, preferably 5 μm or more and 50 μm or less, and may be 20 μm or more.

[Touch sensor layer]
The touch sensor layer 103 is not limited to a detection method as long as it can detect a position touched by a front plate described later. Examples of the detection method include a resistance film method, a capacitance method, an optical sensor method, an ultrasonic method, an electromagnetic induction coupling method, a surface acoustic wave method, and the like. A resistance film type and a capacitive coupling type touch sensor panel are preferably used because of low cost.

An example of a resistance film type touch sensor panel is a pair of substrates arranged opposite to each other, an insulating spacer sandwiched between the pair of substrates, and a transparent film provided on the inner front surface of each substrate as a resistance film. It is composed of a conductive film and a touch position detection circuit. In an image display device provided with a resistive film type touch sensor panel, for example, when the surface of a front plate described later is touched, the opposing resistive films are short-circuited and a current flows through the resistive film. The touch position detection circuit detects a change in voltage at this time, and the touched position is detected.

An example of a capacitive coupling type touch sensor panel includes a base material layer, a position detection transparent electrode layer provided on the entire surface of the base material layer, and a touch position detection circuit. In an image display device provided with a capacitance coupling type touch sensor panel, for example, when the surface of the front plate described later is touched, the transparent electrode is grounded via the capacitance of the human body at the touched point. .. The touch position detection circuit detects the grounding of the transparent electrode, and the touched position is detected.

The touch sensor layer 103 forms, for example, the above-mentioned resistance film type or capacitance coupling type touch sensor panel on a glass plate via a separation layer, separates the glass plate from the separation layer, and is on the separation layer. The base layer may be provided on the glass plate, or the glass plate may be separated from the separation layer to expose the separation layer on the outermost surface. The touch sensor panel may further include an insulating layer, a protective layer, and an adhesive layer in addition to the transparent electrode layer and the base material layer.

Since the colored layer 105 is provided on the touch sensor layer 103, the shielding property of the wiring 104 by the colored layer 105 can be easily improved even when the colored layer 105 is narrow, and the touch sensor layer 103 and the polarizing element layer 101 or the below-mentioned front plate tends to be easily bonded.

In recent years, as the non-display area has become narrower as the display area has expanded, the colored layer 105 formed in the non-display area also tends to be narrowed to a fine shape such as a fine line. On the other hand, the colored layer 105 is often formed on the polarizer layer 101 or on the front plate. Under such circumstances, it takes time and effort to bond the polarizer layer 101 or the front plate and the touch sensor layer 103 so that the wiring 104 is shielded by the narrowed colored layer 105, and the bonding accuracy. (Registration accuracy) was also not sufficient. If the shielding property is not sufficiently obtained, the wiring 104 is visually recognized in the display area, which is not desirable. However, even when the colored layer 105 is narrowed by forming the colored layer 105 on the touch sensor layer 103 having wiring as in the laminated body 100 of the present invention, the colored layer 105 and the wiring 104 Since the alignment is unnecessary, the attachment of the polarizer layer 101 or the front plate and the touch sensor layer 103 becomes extremely easy, and the shielding effect of the wiring 104 by the coloring layer 105 tends to be excellent.

(Color layer)
The colored layer 105 may be arranged on the polarizing layer 101 side of the wiring 104, and may be formed, for example, on the outermost surface of the touch sensor layer 103 on the bonding layer 102 side, or on the touch sensor layer 103 as a base. When it has a material layer, it may be arranged between the transparent electrode layer and the base material layer. The colored layer 105 may be formed of a single layer or a plurality of layers.

The colored layer 105 may be formed by a printing method using a colored layer forming composition such as ink or paint, or may be formed by a photolithography method when the colored layer forming composition is an active energy ray-curable type. can do. Also, these methods may be combined.

Specific examples of printing methods include gravure printing, offset printing, screen printing, and transfer printing from a transfer sheet. Printing by the printing method may be repeated to obtain the colored layer 105 having a desired thickness.

The coloring layer forming composition used for forming the coloring layer 105 contains, for example, a binder resin, a coloring agent, a solvent, and an optional additive. When the colored layer-forming composition is an active energy ray-curable composition, the colored layer-forming composition further contains an active energy ray-polymerizable compound. Further, if necessary, a photopolymerization initiator, a photosensitizer or the like may be contained.

Examples of the binder resin include chlorinated polyolefins (for example, chlorinated polyethylene and chlorinated polypropylene), polyester resins, urethane resins, acrylic resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, and cellulose resins. To be The binder resin may be used alone or in combination of two or more kinds. The binder resin may be a thermopolymerizable resin or a photopolymerizable resin.

The colorant can be black from the viewpoint of reducing the difference in visibility between the display area and the non-display area. When the colored layer 105 is formed of a plurality of layers, the color of the colored layer 105 may be black as long as the colored layer arranged closest to the polarizing layer 102 is black. The color may be a color other than black.

The colored layer forming composition preferably contains carbon black from the viewpoint of reducing the difference in visibility. Colorants other than carbon black include, for example, inorganic pigments such as titanium white, zinc flower, carbon black, iron black, petals, chrome vermilion, ultramarine, cobalt blue, yellow lead, titanium yellow; phthalocyanine blue, induslen. Organic pigments or dyes such as blue, isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, aniline black; metal pigments consisting of scaly foil pieces such as aluminum and brass; titanium dioxide coated mica, basic lead carbonate Pearlescent pigments (pearl pigments) made of flaky foil pieces such as The colorant is preferably contained in an amount of 50 parts by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the binder resin.

The thickness of the colored layer 105 is preferably 0.5 μm or more and 50 μm or less, more preferably 1 μm or more and 30 μm or less, and 1.5 μm or more and 20 μm or less from the viewpoint of improving the shielding effect while suppressing the step. It may be.

When the colored layer 105 is black, even if the colored layer 105 is thin, a high shielding effect can be obtained compared to other colors. FIG. 1 illustrates the case where the colored layer 105 has a uniform thickness and a rectangular cross-sectional shape, but the colored layer 105 does not have to have a uniform thickness, and for example, the thickness decreases toward the inside. It may have a cross-sectional shape having a tapered portion. By having the taper portion, it is possible to suppress the entrapment of air that is likely to occur during stacking. When the thickness of the colored layer 105 is not uniform, the numerical range described above as the thickness of the colored layer 105 is the maximum thickness of the colored layer 105.

The colored layer 105 is not limited to be provided on the entire circumference of the peripheral portion of the touch sensor layer 103, and may be provided on only a part of the peripheral portion according to a desired design or the like. When the colored layer 105 is provided on the peripheral edge of the touch sensor layer 103, its width can be appropriately determined according to the size of the display area, a desired design, and the like, and may be, for example, in the range of 10 μm or more and 50 mm or less. It may be 10 μm or more and 5 mm or less.

(wiring)
The wiring 104 may be arranged in the touch sensor panel to electrically connect the touch position detection circuit and the transparent electrode. The wiring 104 can be a patterned metal film. The metal film can be formed by patterning a metal film formed of a metal such as aluminum, copper, silver, gold, or an alloy thereof by a sputtering method or an evaporation method by a photolithography method or an etching method. The wiring 104 can be provided on the transparent conductive film or the transparent electrode layer in the non-display area. The thickness of the wiring 104 may be, for example, 30 nm or more and 7 μm or less. The line width of the wiring 104 is usually 1 μm or more and 2 mm or less.

(Base material layer)
Examples of the base material layer include a base material film in which a transparent conductive layer is vapor-deposited on one surface, a base material film in which the transparent conductive layer is transferred via an adhesive layer, and the like. Alternatively, the separating layer described below may be used as a base layer without a separate base film.

The substrate film is not limited as long as it is a resin film that can transmit light.
For example, cyclic polyolefin resin film, cellulose acetate resin film made of resin such as triacetyl cellulose, diacetyl cellulose, polyester resin film made of resin such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polycarbonate resin Films known in the art, such as a film, a (meth)acrylic resin film, and a polypropylene resin film can be mentioned. Of these, a cyclic polyolefin resin film is preferable. The thickness of the substrate film is usually 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less, and usually 5 μm or more and 10 μm or more. The substrate layer may be removed from the touch sensor layer after incorporating the transparent conductive layer into the touch sensor layer.

(Transparent conductive layer)
The transparent conductive layer may be a transparent conductive layer made of a metal oxide such as ITO, or may be a metal layer made of a metal such as aluminum, copper, silver, gold, or an alloy thereof. The transparent conductive layer may be patterned by photolithography. The touch sensor layer 103 may have one or more transparent conductive layers. The transparent conductive layer may be a single layer or a multilayer, and when it is a multilayer, the material forming each layer may be the same or different.

(Separation layer)
The separation layer can be a layer formed on a substrate such as a glass plate and for separating the transparent conductive layer formed on the separation layer from the substrate together with the separation layer. The separation layer is preferably an inorganic layer or an organic layer. Examples of the material forming the inorganic layer include silicon oxide. As a material for forming the organic material layer, for example, a (meth)acrylic resin composition, an epoxy resin composition, a polyimide resin composition, or the like can be used. The separation layer may be removed with the substrate so that it is not included in the touch sensor layer.

(Insulating layer)
The insulating layer can be formed so as to cover the wiring 104 and the transparent conductive layer. The insulating layer can be formed from at least one material selected from the group consisting of curable prepolymers, curable polymers and plastic polymers. The insulating layer may also be formed from a film formable varnish type material. The varnish type material may include at least one selected from the group consisting of polysilicone, polyimide, and polyurethane materials. The insulating layer may be an adhesive layer described below. The insulating layer may be patterned by photolithography. The insulating layer may be a single layer or a multilayer, and when the insulating layer is a multilayer, the materials forming each layer may be the same or different.

(Adhesive layer)
Examples of the adhesive layer include the adhesive layer and the pressure-sensitive adhesive layer used for the bonding layer. The adhesive layer may include at least one material selected from the group consisting of polyester resins, polyether resins, polyurethane resins, epoxy resins, silicone resins and acrylic resins.

[Other layers]
The laminated body 100 may have a front plate and an organic EL display element as other layers.

(Front plate)
The front plate is preferably a plate that can transmit light. The front plate may be composed of only one layer, or may be composed of two or more layers. The front plate may constitute the outermost surface of the image display device.
Examples of the front plate include a glass plate-shaped body (for example, a glass plate, a glass film, etc.) and a resin plate-shaped body (for example, a resin plate, a resin sheet, a resin film, etc.). Among the above, from the viewpoint of flexibility of the laminated body and the image display device including the laminated body, a resin plate-shaped body such as a resin film is preferable.

Examples of the thermoplastic resin that constitutes the resin plate such as a resin film include chain polyolefin resins (polyethylene resin, polypropylene resin, polymethylpentene resin, etc.), cyclic polyolefin resins (norbornene resins). Polyolefin resin such as resin); Cellulose resin such as triacetyl cellulose; Polyester resin such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate; Polycarbonate resin; Ethylene-vinyl acetate resin; Polystyrene resin; Polyamide -Based resin; polyetherimide-based resin; (meth)acrylic resin such as polymethyl (meth)acrylate resin; polyimide-based resin; polyethersulfone-based resin; polysulfone-based resin; polyvinyl chloride-based resin; polyvinylidene chloride-based resin; Examples thereof include polyvinyl alcohol-based resins; polyvinyl acetal-based resins; polyether ketone-based resins; polyether ether ketone-based resins; polyether sulfone-based resins; polyamideimide-based resins.
The thermoplastic resins may be used alone or in combination of two or more.
Among them, a polyimide resin, a polyamide resin, and a polyamide-imide resin are preferably used as the thermoplastic resin constituting the front plate from the viewpoint of flexibility, strength, and transparency.

The front plate may be a film in which a hard coat layer is provided on at least one surface of the base film to further improve the hardness. As the base film, the above-mentioned resin film can be used.

The hard coat layer may be formed on one surface of the base film, or may be formed on both surfaces. By providing the hard coat layer, hardness and scratch resistance can be improved. The thickness of the hard coat layer may be, for example, 0.1 μm or more and 30 μm or less, preferably 1 μm or more and 20 μm or less, and more preferably 5 μm or more and 15 μm or less.

The hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of the ultraviolet curable resin include (meth)acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, and epoxy resin. The hard coat layer may contain an additive in order to improve the strength. The additive is not limited and includes inorganic fine particles, organic fine particles, or a mixture thereof.

The front plate not only has a function of protecting the front surface (screen) of the image display device (function as a window film), but also has a function as a touch sensor, a blue light cut function, a viewing angle adjustment function, and the like. May be.

The thickness of the front plate may be, for example, 10 μm or more and 2000 μm or less, 20 μm or more and 2000 μm or less, preferably 25 μm or more and 1500 μm or less, more preferably 30 μm or more and 1000 μm or less, still more preferably 40 μm or more and 500 μm or less, particularly preferably. May be 40 μm or more and 200 μm or less, and further 40 μm or more and 100 μm or less.

(Organic EL display element)
A conventionally known organic EL display element can be used.

[Manufacturing method of laminate]
The layered product concerning one embodiment of the present invention can be manufactured by pasting up the layers which constitute a layered product via a pasting layer. When laminating the layers via the laminating layer, it is preferable to subject one or both of the laminating surfaces to surface activation treatment such as corona treatment in order to enhance the adhesiveness.

The method for manufacturing the laminate 100 includes, for example, a step of preparing the polarizing layer 101, a step of preparing the touch sensor layer 103, and a step of bonding the polarizing layer and the touch sensor layer via the bonding layer. The step of preparing the touch sensor layer 103 can include a coloring layer forming step of forming the coloring layer 105 by a photolithography method.

The polarizing layer 101 can be formed directly on the front plate or the base material or via the alignment film, and the base material may be incorporated in the laminate or may be peeled from the polarizing layer 101. It may not be a constituent element of the laminate.

The touch sensor layer 103 can be manufactured, for example, by the following first to fourth methods.

In the first method, first, the base material layer 111 is laminated on the glass plate via the adhesive layer. The transparent conductive layer, the wiring 104, and the coloring layer 105 are formed in this order on the base material layer 111. By applying heat, the glass substrate and the base material layer 111 are separated, and the touch sensor layer 103 including the colored layer 105, the wiring 104, the transparent conductive layer, and the base material layer 111 is obtained.

In the second method, first, the separation layer is formed on the glass plate. A transparent conductive layer, a wiring 104, an insulating layer, and a coloring layer 105 are formed in this order on the separation layer. A peelable thermoplastic resin film is laminated on the outermost surface on the opposite side of the separation layer, and the colored layer 105 to the separation layer is transferred to the peelable thermoplastic resin film to separate the glass plate. Next, the base material layer 111 is prepared, and the base material layer 111 and the separation layer are bonded together via the adhesive layer. By peeling off the peelable thermoplastic resin film, a touch sensor layer 103 having a colored layer 105, an insulating layer, a wiring 104, a transparent conductive layer, a separating layer, an adhesive layer, and a base material layer 111 can be obtained in this order. .. Before forming the colored layer 105, another transparent conductive layer may be formed on the insulating layer, and another insulating layer may be formed on the other transparent conductive layer.

③ In the third method, first, the separation layer is formed on the glass plate. A transparent conductive layer, a wiring 104, an insulating layer, and a coloring layer 105 are formed in this order on the separation layer. The polarizing layer 101 is attached to the outermost surface on the opposite side of the separation layer via the attaching layer 102. Then, the glass plate is separated to obtain the touch sensor layer 103 having the colored layer 105, the insulating layer, the wiring 104, the transparent conductive layer, and the separation layer in this order. Another transparent conductive layer may be further formed on the insulating layer, another insulating layer may be formed on another transparent conductive layer, and the coloring layer 105 may be formed on the other insulating layer.

In the fourth method, first, the separation layer is formed on the glass plate. The coloring layer 105 is formed over the separation layer. Next, the transparent conductive layer, the wiring 104, and the insulating layer are formed in this order on the colored layer 105. A peelable thermoplastic resin film is laminated on the outermost surface opposite to the separation layer, and the separation layer to the insulating layer are transferred to the peelable thermoplastic resin film to separate the glass plate. Next, the base material layer is prepared, and the base material layer and the separation layer are bonded together via the adhesive layer. By peeling off the peelable thermoplastic resin film, a touch sensor layer 103 having an insulating layer, a wiring 104, a transparent conductive layer, a colored layer 105, a separating layer, an adhesive layer, and a base material layer in this order can be obtained. Before laminating the peelable thermoplastic resin film, another transparent conductive layer may be formed on the insulating layer, and another insulating layer may be formed on the other transparent conductive layer.

The colored layer 105 is preferably formed by a photolithography method. When the colored layer 105 is formed by a photolithography method, the film thickness of the colored layer 105 tends to be thinned, and the step between the display area and the non-display area tends to be small on the surface of the laminated body 100 on the touch sensor 103 side. is there.

In the photolithography method, the above-mentioned active energy ray-curable colored layer forming composition is applied onto an insulating layer or a base material layer and dried to form a colored layer forming composition layer, and the composition layer for forming a colored layer is formed through a photomask. The method may be a method in which the colored layer forming composition layer is exposed to light and developed. Post-baking can also be performed after development.

When the pressure-sensitive adhesive layer and the polarizing layer 101 and the touch sensor layer 103 are bonded together, the bonding surface can be subjected to a treatment such as corona treatment or plasma treatment.

[Use of image display device]
The image display device according to the present invention can be used as a mobile device such as a smartphone or a tablet, a television, a digital photo frame, an electronic signboard, a measuring instrument or measuring instrument, office equipment, medical equipment, computer equipment, or the like. Since the laminated body of the present invention has a wide display area and little irregularities in appearance, it is possible to provide a high-quality image display device in which the display area is enlarged.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. "%" and "parts" in the examples are% by mass and parts by mass unless otherwise specified.

[Color difference]
The hues a ^* and b ^* of the non-display area and the display area are measured from the front plate side of the laminated body using an integrated reflectivity measuring device (KONICA MINOLTA, CM-3700d), and the hues of the non-display area and the display area are measured. The absolute values Δa ^* and Δb ^* of the difference between were calculated.

[Step]
The level difference between the display area and the non-display area was measured on the surface of the laminated body on the touch sensor side using an interferometer microscope (Contour GT, Bruker).

[Position accuracy]
Using an optical microscope (manufactured by Olympus), the touch sensor alignment mark (cross "+" type) 104a and the colored layer alignment mark (cross "+" type) 104a (hereinafter, colored) shown in FIG. The center distance La131 from the mark (also referred to as a mark) 105a was measured. The distance La131 was obtained from the absolute values Δx and Δy of the difference between the TS mark 104a and the colored mark 105a in the x-direction and the y-direction by the following formula.
La=[(Δx) ² +(Δy) ² ] ^1/2
The distance La131 is equal to the distance L132 between the colored layer 105 and the wiring 104, and the smaller the distance La131, the better the positional accuracy between the colored layer 105 and the wiring 104. When the distance La131 is 5 μm or less, it is indicated by ◯, when it is more than 5 μm and 50 μm or less, it is indicated by Δ, and when it exceeds 50 μm, it is indicated by ×.

[Optical density]
On the transparent glass substrate, the same operation as in Examples and Comparative Examples was performed to prepare sample films of the colored layer, and the optical density (OD) of each obtained sample film was measured by an optical density measuring device (product name: 361T, It was measured using (manufactured by X-rite).

<Composition 1 for forming a colored layer>
Composition for forming an active energy ray-curable colored layer containing carbon black (“CR-BK0951L” manufactured by Samsung SDI Co., Ltd.)

<Composition for forming a colored layer 2>
[Ink component]
Acetylene black (carbon black) 15% by mass
Polyester 75 mass%
Glutaric acid dimethyl ester 2.5% by mass
Succinic acid 2% by mass
Isophorone 5.5% by mass
[Curing agent]
Aliphatic polyisocyanate 75% by mass
Ethyl acetate 25% by mass
[solvent]
Isophorone [Manufacturing method]
10 parts by mass of a curing agent and 10 parts by mass of a solvent were added to 100 parts by mass of the ink component, and the mixture was stirred to obtain a coloring layer forming composition 2.

<Preparation of adhesive sheet 1>
On a mass basis, 84 parts of 2-ethylhexyl acrylate, 15 parts of isobornyl acrylate, 1 part of hydroxypropyl acrylate, and 0.02 part of 1-hydroxycyclohexylphenyl ketone as a polymerization initiator were mixed. The mixture was irradiated with ultraviolet rays to polymerize the monomers.
Then, as a polymerization initiator, 0.4 parts of 1-hydroxycyclohexylphenyl ketone, 0.3 parts of lauryl acrylate, 0.05 parts of polyethylene glycol (200) diacrylate, and 0.05 parts of (3-glycidyloxypropyl). ) Trimethoxysilane was added to the mixed solution to prepare an adhesive composition.
The pressure-sensitive adhesive composition was applied onto a polyethylene terephthalate film (release film) whose surface was treated with silicon. The coating thickness was 25 μm. Another release film was prepared and laminated on the coating film. The layered product having the layer structure of release film/coating of pressure-sensitive adhesive composition/release film was irradiated with ultraviolet rays. In the ultraviolet irradiation step, ultraviolet rays of 300 to 400 nm (emission intensity becomes maximum at 365 nm) were applied to the laminate so that the integrated light amount would be 1500 mJ/cm ² . Thus, the pressure-sensitive adhesive sheet 1 including the (meth)acrylic pressure-sensitive adhesive layer 1 having a thickness of 25 μm was produced.

<Preparation of adhesive sheet 2>
In a reactor equipped with a cooling pipe, a nitrogen introducing pipe, a thermometer and a stirrer, 81.8 parts of acetone, 61.0 parts of butyl acrylate, 37 parts of methyl methacrylate, 1.0 part of acrylic acid, and 2-acrylic acid A mixed solution of 1.0 part of hydroxyethyl was charged, and the internal temperature was raised to 55° C. while the air in the apparatus was replaced with nitrogen gas to make it oxygen-free. Then, a total solution of 0.14 parts of azobisisobutyronitrile (polymerization initiator) dissolved in 10 parts of acetone was added. One hour after the initiator was added, acetone was continuously added to the reactor at an addition rate of 17.3 parts/hr so that the concentration of the acrylic resin excluding the monomer was 35%, while the internal temperature was 54 to 56°C. The temperature was kept for 12 hours, and finally ethyl acetate was added to adjust the concentration of the acrylic resin to 20%.
i) The above-mentioned non-volatile content acrylic resin: 100 parts ii) As an isocyanate compound, Coronate L: 3.0 parts iii) As a silane compound, KBM403: 0.5 part was mixed. Ethyl acetate was added so that the total solid content concentration was 10% to obtain an adhesive composition.
The obtained pressure-sensitive adhesive composition was applied to a release-treated surface of a release-treated polyethylene terephthalate film (thickness 38 μm) using an applicator so that the thickness after drying would be 5 μm. The coating layer was dried at 100° C. for 1 minute to obtain a film including the pressure-sensitive adhesive layer 2. Then, another release-treated polyethylene terephthalate film (thickness 38 μm) was laminated on the pressure-sensitive adhesive layer 2. Then, the adhesive sheet 2 was manufactured by curing for 7 days under the conditions of a temperature of 23° C. and a relative humidity of 50% RH.

<Example 1>
1. Fabrication of Touch Sensor Layer The procedure for manufacturing the touch sensor layer will be described below with reference to FIG.
1) Formation of separation layer (Fig. 5a)
Acrylic resin was coated on the glass plate 301 to form the separation layer 302.
2) Formation of touch sensor layer (Fig. 5b)
A first ITO layer 303, a wiring (copper pattern) 304, a first insulating layer 305, a second ITO layer 306, and a second insulating layer 307 were formed in this order on the separation layer 302.
The first ITO layer 303, the second ITO layer 306, and the wiring 304 were manufactured as follows. An ITO film or a metal film was formed by a sputtering method. Then, a photoresist film pattern was formed on the ITO film or the metal film by a photolithography method (including the following steps: photoresist applying step, exposing step, developing step). After patterning the ITO film or the metal film by the etching method, the photoresist film pattern was removed. When the wiring 304 was formed, a TS mark was formed in the outer region of the touch sensor cell to confirm the position accuracy and the stacking state.
The first insulating layer 305 and the second insulating layer 307 were patterned by a photolithography method (including the following steps: insulating layer forming composition coating step, exposure step, developing step and thermosetting step).
3) Formation of colored layer (Fig. 5c)
The coloring layer 308 was formed on the second insulating layer 307 by using the above-described coloring layer forming composition 1 so that the thickness after drying was 1.5 μm. The coloring layer 308 was formed by a photolithography method (including the following steps: coating step 1 of the composition for forming a coloring layer, exposing step, developing step, and thermosetting step). The colored layer 308 was formed above the second insulating layer 307 so that the wiring 304 was located below the colored layer 308. The colored layer 308 was formed so that the colored mark was formed at the same position as the TS mark.
4) Transfer of the touch sensor layer (Fig. 5d)
A PET film 309 (thickness 52 μm) with an adhesive was attached to the surface of the colored layer 308 side.
The touch sensor laminate 300 together with the PET film 309 was peeled off from the glass plate 301.
A base material layer 311 (COP film, thickness 23 μm) was adhered to the surface of the separation layer 302 side via an adhesive layer (photo-curable adhesive) 310.

2. Preparation of Polarizing Layer A polyvinyl alcohol film having an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% and a thickness of 30 μm [trade name “Kuraray Vinylon VF-PE#3000” manufactured by Kuraray Co., Ltd.] was purified with pure water at 37° C. Then, it was immersed in an aqueous solution at 30 ° C. containing iodine and potassium iodide (iodine / potassium iodide / water (mass ratio) = 0.05 / 1.7 / 100).

Immersed in a 58° C. aqueous solution containing potassium iodide and boric acid (potassium iodide/boric acid/water (weight ratio)=12/3.2/100). The film was washed with pure water at 15° C. and then dried at 80° C. to obtain a polarizer having a thickness of about 12 μm in which iodine was adsorbed and oriented in polyvinyl alcohol. Stretching was mainly performed in the steps of iodine dyeing and boric acid treatment, and the total stretching ratio was 5.5. A 25 μm-thick triacetyl cellulose (TAC) film was attached to one surface of the obtained polarizer via an adhesive layer.

On the surface opposite to the TAC side, a retardation layer containing a layer obtained by polymerizing and curing a liquid crystal compound [thickness 16 μm, layer structure: adhesive layer (thickness 5 μm) / from a layer on which the liquid crystal compound is cured and an alignment film Λ / 4 plate (thickness 3 μm) / adhesive layer (thickness 5 μm) / positive C plate (thickness 3 μm) consisting of a layer on which the liquid crystal compound is cured and an alignment film] The adhesive layer on the λ / 4 plate side is bonded. did. The polarizing layer thus prepared (layer structure of “TAC/polarizer/retardation layer, thickness 53 μm”) was prepared. The polarizing layer was a circularly polarizing plate.

3. Preparation of front plate with pressure-sensitive adhesive layer A front plate (thickness 10 μm) having a hard coat layer (thickness 10 μm) formed on one surface of a polyimide resin film (thickness 40 μm) using a composition containing a dendrimer compound having a polyfunctional acrylic group at the end 50 μm) was prepared.

The pressure-sensitive adhesive layer 1 of the pressure-sensitive adhesive sheet 1 prepared above was prepared as the first bonding layer. Corona treatment was performed on the bonding surface of the above-mentioned front plate with the first bonding layer and the bonding surface of the first bonding layer with the front plate. The front plate and the first bonding layer were bonded together to obtain a front plate with an adhesive layer.

4. Production of Laminated Body The procedure for producing a laminated body will be described below with reference to FIG.
The adhesive layer-attached front plate 312 and the polarizing layer 314 are subjected to corona treatment on the bonding surface of the front plate 312 on the first bonding layer 313 side and the bonding surface of the polarizing layer 314 on the TAC side, respectively. The layers were laminated so that the surface was on the inside, and they were laminated using a roll bonding machine (Fig. 5e).

The pressure-sensitive adhesive layer 1 of the pressure-sensitive adhesive sheet 1 prepared above was prepared as the second bonding layer 315. Corona treatment was performed on the surface of the polarizing layer 314 on the retardation layer side and the surface of the second bonding layer 315 that is bonded to the polarizing layer 314. The second bonding layer 315 was bonded to the surface of the polarizing layer 314 on the phase difference layer side (FIG. 5f).

The PET film 309 with an adhesive was peeled off, and the surface on the colored layer 308 side and the second bonded layer 315 of the polarizing layer 314 were bonded to obtain the laminate 320 of Example 1 (FIG. 5 g). The results are shown in Table 1.

<Example 2>
A laminate of Example 2 was obtained in the same manner as in Example 1 except that the polarizing layer was produced as follows. The results are shown in Table 1.
The alignment film composition was applied to one side of a 25 μm TAC film, dried and polarized to form an alignment film. A composition containing a dichroic dye and a polymerizable liquid crystal compound was applied onto the alignment film and dried. The polymerizable liquid crystal compound was cured by UV irradiation to form a coating type polarizer (thickness 2 μm). Then, a protective composition containing polyvinyl alcohol and water was applied to the surface of the polarizer opposite to the TAC film and dried to form a protective layer (thickness: 0.5 μm, not shown in the figure). A retardation layer including a layer in which a liquid crystal compound is polymerized and cured on the surface of the protective layer opposite to the polarizer side [thickness 16 μm, layer structure: adhesive layer (thickness 5 μm)/liquid crystal compound cured) Λ/4 plate (thickness 3 μm)/adhesive layer (thickness 5 μm) consisting of layer and alignment film/positive C plate (thickness 3 μm) consisting of layer cured with liquid crystal compound and alignment film] was laminated. A polarizing layer (layer structure of “TAC/polarizer/retardation layer, thickness 43 μm”) thus prepared was prepared.

<Example 3>
1. Fabrication of Touch Sensor Layer The fabrication procedure of the touch sensor layer will be described below with reference to FIG.
1) Formation of separation layer (Fig. 6a)
A glass plate 401 was coated with an acrylic resin to form a separation layer 402.
2) Formation of touch sensor layer (Fig. 6b)
A first ITO layer 403, a wiring (copper pattern) 404, a first insulating layer 405, a second ITO layer 406, and a second insulating layer 407 were formed in this order on the separation layer 402.
The first ITO layer 403, the second ITO layer 406, and the wiring 404 were produced as follows. An ITO film or a metal film was formed by a sputtering method. Then, a photoresist film pattern was formed on the ITO film or the metal film by a photolithography method (photoresist coating step, exposure step, developing step). After patterning the ITO film or the metal film by the etching method, the photoresist film pattern was removed. When forming the wiring 404, a TS mark for confirming the positional accuracy and the stacked state was formed in the area outside the touch sensor cell.
The first insulating layer 405 and the second insulating layer 407 were patterned by a photolithography method (including the following steps: insulating layer forming composition coating step, exposure step, developing step and thermosetting step).
3) Formation of colored layer (Fig. 6c)
The coloring layer 408 was formed on the second insulating layer 407 by using the above-described coloring layer forming composition 1 so that the thickness after drying was 1.5 μm. The colored layer 408 was formed by a photolithography method (including the following steps: composition 1 coating step for forming a colored layer, an exposure step, a developing step, and a thermosetting step). The coloring layer 408 was formed over the second insulating layer 407 so that the wiring 404 was located under the coloring layer 408. The colored layer 408 was formed such that the colored mark was formed at the same position as the TS mark.

2. Preparation of Polarizing Layer A polarizing layer was prepared in the same manner as in “2. Preparation of polarizing layer” in Example 1.

3. Preparation of Front Plate with Adhesive Layer A front plate with an adhesive layer was prepared in the same manner as in "3. Preparation of a front plate with an adhesive layer" of Example 1.

4. Production of Laminated Body The procedure for producing a laminated body will be described below with reference to FIG.
The adhesive layer-attached front plate 412 and the polarizing layer 414 are subjected to corona treatment on the bonding surface on the first bonding layer 413 side of the front plate 412 and the bonding surface on the TAC side of the polarizing layer 414, respectively. The layers were laminated so that the surface was on the inside, and they were laminated using a roll bonding machine (Fig. 6d).

The pressure-sensitive adhesive layer 2 of the pressure-sensitive adhesive sheet 2 prepared above was prepared as the second bonding layer 415. Corona treatment was performed on the retardation layer side surface of the polarizing layer 414 and the bonding surface of the second bonding layer 415 with the polarizing layer 414. The second bonding layer 415 was bonded to the surface of the polarizing layer 414 on the retardation layer side (FIG. 6e).

The surface on the colored layer 408 side and the second bonding layer 415 of the polarizing layer 414 were bonded together, and the glass plate 401 was peeled off from the separation layer 402 to obtain the laminate 420 of Example 3 (FIG. 6f). The results are shown in Table 1.

<Example 4>
1. Fabrication of Touch Sensor Layer The procedure for manufacturing the touch sensor layer will be described below with reference to FIG. 7.
1) Formation of separation layer (Fig. 7a)
Acrylic resin was coated on the glass plate 501 to form the separation layer 502.
2) Formation of colored layer (Fig. 7b)
The colored layer 508 was formed on the separation layer 502 by using the above-described colored layer forming composition 1 so that the thickness after drying was 1.5 μm. The coloring layer 508 was formed by a photolithography method (including the following steps: coating step of the composition 1 for forming a coloring layer, exposing step, developing step, and thermosetting step).
When the colored layer 508 was formed, a colored mark was formed in the outer region of the touch sensor cell.
3) Formation of touch sensor layer (Fig. 7c)
A first ITO 503 layer, a wiring (copper pattern) 504, a first insulating layer 505, a second ITO layer 506, and a second insulating layer 507 were formed in this order on the colored layer 508 of the separation layer 502.
The first ITO layer 503, the second ITO layer 506, and the wiring 504 were manufactured as follows. An ITO film or a metal film was formed by a sputtering method. Next, a photoresist film pattern was formed on the ITO film or the metal film by a photolithography method (photoresist coating step, exposure step, developing step). After patterning the ITO film or the metal film by the etching method, the photoresist film pattern was removed. The wiring 504 was formed so that the TS mark was formed at the same position as the colored mark.
4) Transfer of the touch sensor layer (Fig. 7d)
A PET film 509 with an adhesive (thickness 52 μm) was attached to the surface of the second insulating layer 507 side. After peeling the touch sensor laminated body 500 together with the PET film 509 from the glass plate 501, a base material layer 511 (COP film, thickness) is provided on the surface of the separation layer 502 side via an adhesive layer (photo-curable adhesive) 510. 23 μm) was adhered.

4. Production of Laminated Body The procedure for producing a laminated body will be described below with reference to FIG. 7.
The adhesive layer-attached front plate 512 and the polarizing layer 514 are subjected to corona treatment on the bonding surface of the front plate 512 on the side of the first bonding layer 513 and the bonding surface of the polarizing layer 514 on the side of TAC, respectively. The layers were laminated so that the surface was on the inside, and they were laminated using a roll bonding machine (Fig. 7e).

The pressure-sensitive adhesive layer 1 of the pressure-sensitive adhesive sheet 1 prepared above was prepared as the second bonding layer 515. Corona treatment was applied to the retardation layer side surface of the polarizing layer 514 and the bonding surface of the second bonding layer 515 with the polarizing layer 514. The second bonding layer 515 was bonded to the surface of the polarizing layer 514 on the retardation layer side (FIG. 7f).

The surface on the side of the base material layer 511 and the second bonding layer 515 of the polarizing layer 514 were bonded together to obtain a laminated body 520 of Example 4 (FIG. 7g). The results are shown in Table 1.

<Example 5>
In the production of the touch sensor layer of Example 3, the laminated body of Example 5 was obtained in the same manner as in Example 3 except that the colored layer was produced as follows. The results are shown in Table 1.
The colored layer was formed on the second insulating layer of the touch sensor layer. As the ink, the colored layer forming composition 2 prepared above was used. By the screen printing method, printing with a discharge amount such that the coating thickness after drying was 3 μm was repeated twice. A 460 mesh screen was used as the screen.

<Comparative Example 1>
Comparison was performed in the same manner as in Example 1 except that the colored layer was provided on the surface of the front plate to which the first bonding layer was bonded, instead of forming the colored layer on the second insulating layer of the touch sensor layer. The laminate of Example 1 was prepared. The results are shown in Table 1.

<Comparative example 2>
Comparison was performed in the same manner as in Example 2 except that the colored layer was provided on the surface of the front plate to which the first bonding layer was bonded, instead of forming the colored layer on the second insulating layer of the touch sensor layer. The laminate of Example 2 was prepared. The results are shown in Table 1.

<Comparative example 3>
A laminate of Comparative Example 3 as in Example 1 except that the coloring layer was provided on the surface of the polarizing layer on the phase difference layer side instead of forming the coloring layer on the second insulating layer of the touch sensor layer. Was produced. The results are shown in Table 1.

100,200,320,420,520 laminated body, 101,314,414,514 polarizing layer, 102,202,203 bonded layer, 103 touch sensor layer, 104,304,404,504 wiring, 104a TS mark, 105 , 308, 408, 508 colored layer, 105a colored mark, 121 display area A, 122 non-display area B, 131 distance La, 132 distance L, 201, 312, 421, 512 front plate, 204 organic EL display element, 300, 500 touch sensor laminate, 301,401,501 glass plate, 302,402,502 separation layer, 303,403,503 first ITO layer, 305,405,505 first insulation layer, 306,406,506 second ITO layer, 307,407,507 second insulating layer, 309,509 PET film with adhesive, 310,510 adhesive layer, 311,511 base material layer, 313,413,513 first bonded layer, 315,415,515th 2 laminating layers.

Claims

A laminated body having a polarizing layer, a bonding layer, and a touch sensor layer in this order,
The touch sensor layer includes wiring and a colored layer.
In a plan view, the laminate is divided into a display area and a non-display area,
The laminated body, wherein the colored layer is provided in the non-display area and is arranged closer to the polarizing layer than the wiring.
The laminate according to claim 1, wherein the absolute values Δa * and Δb * of the color difference between the display area and the non-display area when viewed from the polarizing layer side are both 0.3 or less.
The laminate according to claim 1 or 2, wherein the colored layer contains carbon black.
The laminate according to any one of claims 1 to 3, wherein the step between the display area and the non-display area on the outermost surface when viewed from the touch sensor layer side is 3 μm or less.
The layered product according to any one of claims 1 to 4, wherein the colored layer has a thickness of 2 µm or less and an optical density of 4 or more.
The laminate according to any one of claims 1 to 5, further comprising an organic EL display element on the outermost surface of the touch sensor layer side.
An image display device including the laminate according to any one of claims 1 to 6.
A method for manufacturing a laminate according to any one of claims 1 to 6, comprising:
The process of preparing the polarizing layer and
The process of preparing the touch sensor layer and
Including a step of laminating the polarizing layer and the touch sensor layer via a laminating layer, the step of preparing the touch sensor layer has a colored layer forming step of forming a colored layer by a photolithography method, Production method.