WO2021145084A1 - Layered body and image display device - Google Patents

Abstract

Provided is a layered body comprising a colored layer and a first optical member, wherein: the layered body is differentiated into a display region and a non-display region in plan view; the colored layer is provided in the non-display region; the colored layer has a single-layer structure; an end part region of the colored layer on the display-region side has, in a surface on the opposite side to the first-optical-member side, a tapered section in which the display-region-side thickness decreases; and the taper angle of the tapered section is 60° or less with respect to the surface of the colored layer on the first-optical-member side.

Description

Laminate and image display device

The present invention relates to a laminated body and further to an image display device including the laminated body.

As various image display devices such as a liquid crystal display device and an organic electroluminescence (EL) display device, it is known that a front plate is provided on the visual side of the display panel to protect the display panel. A printing layer may be provided on such a front plate in order to conceal a non-display area of the image display device (for example, Japanese Patent Application Laid-Open No. 2014-238533 (Patent Document 1)).

Japanese Unexamined Patent Publication No. 2014-238533

When the non-display area is formed by the print layer, the non-display area often has a multi-layer structure in which a plurality of print layers are laminated in order to secure sufficient shielding property. However, the printing layer having such a multi-layer structure tends to have a large thickness, and when another optical member is bonded via a bonding layer such as an adhesive layer to form a laminated body, it bends at a high temperature. At that time, bubbles may be generated at the boundary between the display area and the non-display area.

An object of the present invention is to provide a laminated body in which bubbles that affect the appearance of an image display device are unlikely to occur at the boundary between a non-display area and a display area when bent at a high temperature.

The present invention provides the following laminate and image display device.
[1] A laminated body including a colored layer and a first optical member.
The laminated body is divided into a display area and a non-display area in a plan view.
The colored layer is provided in the non-display area and is provided.
The colored layer has a single layer structure and has a single layer structure.
The end region of the colored layer on the display region side has a tapered portion on the surface opposite to the first optical member side, which reduces the thickness on the display region side.
A laminated body in which the taper angle of the tapered portion is 60 ° or less with respect to the surface of the colored layer on the side of the first optical member.
[2] The laminate according to [1], wherein the colored layer has a thickness of less than 10 μm.
[3] The laminate according to [1] or [2], wherein the colored layer has an optical density of 5 or more.
[4] The laminate according to any one of [1] to [3], wherein the colored layer contains carbon black.
[5] The laminate according to any one of [1] to [4], further comprising a separation layer between the colored layer and the first optical member.
[6] The laminate according to any one of [1] to [5], wherein the first optical member is a polarizing plate.
[7] The laminate according to [1] to [6], further comprising a second optical member laminated via an adhesive layer on a side of the colored layer opposite to the first optical member side.
[8] The laminate according to [7], wherein the second optical member is a protective film.
[9] An image display device comprising the laminate according to any one of [1] to [8].

According to the present invention, it is possible to provide a laminated body in which bubbles that affect the appearance of an image display device are unlikely to occur at the boundary between a non-display area and a display area when bent at a high temperature.

It is the schematic sectional drawing which shows an example of the laminated body of this invention schematically. It is a schematic top view of the laminated body shown in FIG. It is the schematic sectional drawing which shows an example of the laminated body of this invention schematically. It is the schematic cross-sectional view which shows typically the taper angle of a colored layer. It is the schematic sectional drawing which shows typically the manufacturing method of the laminated body of this invention. 6 is a transmission electron microscope image illustrating the thickness, taper width, and taper angle of the colored layer measured in the examples. It is the schematic sectional drawing which shows typically the bubble evaluation in an Example. It is the schematic sectional drawing which shows typically the exposure process in an Example.

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 scale is appropriately adjusted to make it easier to understand each component, and the scale of each component shown in the drawings does not necessarily match the scale of the actual component.

<Laminated body>
FIG. 1 is a schematic cross-sectional view schematically showing an example of a laminated body. The laminated body 100 shown in FIG. 1 includes a colored layer 110 and a first optical member 120. The laminated body 100 is divided into a display area A and a non-display area B, and the colored layer 110 is provided in the non-display area B. The laminate 100 can further include a second optical member, an adhesive layer, a separation layer and a protective layer, a bonding layer, and the like, which will be described later.

FIG. 2 is a schematic top view of the laminated body 100 as viewed from the colored layer side in a plan view. The laminated body 100 is divided into a display area A101 and a non-display area B102. When the laminated body 100 constitutes an image display device, the display area A of the laminated body 100 is an area where the image is visually recognized, and the non-display area B is an area where the image is not visually recognized. Therefore, it may be required that electrodes, wiring, and the like are arranged in the non-display area B, and that light leakage from a display unit provided in the image display device is suppressed. In this case, it is preferable that the colored layer 110 provided in the non-display region B has a concealing property such as electrodes and wiring and a sufficient shielding property to be able to suppress light leakage. In the present specification, the plan view means the view from the thickness direction of the layer.

It is preferable that the laminated body 100 is bendable. Since the laminate 100 is bendable, it can be used for a flexible display. Bendable means that it can be bent without causing cracks. The laminated body 100 may be bendable with the visible side on the inside, may be bendable with the opposite side on the visual side on the inside, and may be bendable with both of them on the inside. Bending includes a form of bending in which a curved surface is formed on the bent portion. In the form of bending, the bending radius of the bent inner surface is not particularly limited. Bending also includes a form of refraction in which the refraction angle of the inner surface is greater than 0 degrees and less than 180 degrees, and a form of folding in which the bending radius of the inner surface is close to zero or the refraction angle of the inner surface is 0 degrees. .. In the present specification, when the laminated body 100 is used in the image display device, the visual viewing side is the side opposite to the side to be bonded to the image display element of the laminated body 100.

The laminated body 100 may have, for example, a square shape in a plan view, preferably a square shape having a long side and a short side, and more preferably a rectangle. When the shape of the laminated body 100 in a plan view is rectangular, the length of the long side may be, for example, 10 mm or more and 1400 mm or less, 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. Each layer constituting the laminated body 100 may have a corner portion R-processed, an end portion notched, or a perforated portion.

The thickness of the laminate 100 is not particularly limited because it varies depending on the function required for the laminate, the application of the laminate, etc., but is, for example, 20 μm or more and 500 μm or less, preferably 50 μm or more and 300 μm or less, and more preferably 70 μm or more and 200 μm. It is as follows.

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 laminate 100 is bendable, the laminate 100 is suitable for a flexible display.

The laminate 200 shown in FIG. 3 includes a first optical member 120, a bonding layer 160, and a colored layer 110, and an adhesive layer 150 is interposed on the side of the colored layer 110 opposite to the first optical member 120 side. A second optical member 130 is further provided. The laminate 200 further includes a separation layer 140 between the colored layer 110 and the first optical member 120. Hereinafter, the first optical member 120 and the second optical member 130 are collectively referred to as an optical member. In the laminated body 200, a touch sensor panel (not shown) may be laminated on the first optical member 120 side via an adhesive layer (not shown).

(Colored layer)
As described above, the colored layer 110 has a shielding property in order to shield the electrodes and wiring arranged in the non-display area B and to suppress light leakage from the display unit provided in the image display device. be able to. The colored layer 110 has a single layer structure. The colored layer 110 is formed in the non-display region B in the plan view of the laminated body, and is preferably provided on at least a part of the peripheral edge portion of the laminated body in the plan view of the laminated body, and more preferably the non-display region shown in FIG. It is provided on the entire peripheral edge of the laminate so as to form the region B.

As shown in FIG. 1, the end region of the colored layer 110 on the display region A side has a tapered portion 110a whose thickness on the display region A side is reduced on the surface opposite to the first optical member 120 side. The taper angle θ of the tapered portion 110a is 60 ° or less with respect to the surface of the colored layer 110 on the first optical member 120 side. Since the taper angle of the laminated body is 60 ° or less, when the laminated body is bent at a high temperature, bubbles that affect the appearance of the image display device are unlikely to occur at the boundary between the non-display area and the display area. It becomes a tendency. The tapered portion 110a refers to a point from the end portion of the colored layer 110 on the display region A side to the point where the maximum thickness of the colored layer 110 is reached. Bubbles are observed according to the method described in the Examples section below.

As shown in FIG. 4, the taper angle θ is a point α in which the tapered portion 110a is in contact with the surface S1 and a point β in contact with the surface S2 when the surfaces forming the uniform thickness of the colored layer 110 are S1 and S2, respectively. Refers to the angle formed by the straight line L connecting the colored layer 110 and the surface of the colored layer 110 on the first optical member 120 side (surface S2 in FIG. 4). The shape of the tapered portion 110a may be a curved line such as an arc shape as shown in FIG. 4, or may be a straight line as shown in FIG.

The taper angle θ is preferably 60 ° or less, more preferably 55 ° or less, still more preferably 50 ° or less, and may be 45 ° or less. The taper angle θ is usually more than 0 °, for example, 1 ° or more, 5 ° or more, 10 ° or more, 15 ° or more, or 20 ° or more. The taper angle θ is measured according to the measuring method described in the column of Examples described later.

The thickness of the colored layer 110 is preferably less than 10 μm. As a result, when the laminated body is bent at a high temperature, bubbles that affect the appearance of the image display device tend to be less likely to be generated at the boundary between the non-display area and the display area. The thickness of the colored layer 110 is preferably 8 μm or less, more preferably 6 μm or less, still more preferably 4 μm or less, and particularly preferably 3 μm or less, from the viewpoint of suppressing air bubbles and reducing steps on the surface of the laminate. Yes, especially preferably 2 μm or less. The thickness of the colored layer 110 is, for example, 0.1 μm or more, preferably 0.5 μm or more, and more preferably 1.0 μm or more from the viewpoint of enhancing the shielding property. The thickness of the colored layer 110 is usually constant in a region 20 μm or more away from the end of the colored layer 110 on the display region A side. The thickness of the colored layer 110 is the maximum thickness of the colored layer 110, which is the thickness of a region 20 μm or more away from the end portion of the colored layer 110 on the display region A side. The thickness of the colored layer 110 is measured by the measuring method described in the column of Examples described later.

In FIG. 1, the taper width 110b of the tapered portion 110a in a plan view may be, for example, 1 μm or more and 20 μm or less, preferably 1.5 μm or more and 15 μm or less. When the taper width is within the above range, good shielding property and bubble suppressing effect tend to be easily obtained.

The colored layer 110 can be formed by a method in which a colored layer containing a colorant is formed in advance and transferred onto an optical member (hereinafter, also referred to as a transfer method). Examples of the method for forming the colored layer include a printing method using ink or paint, a vapor deposition method using powder of a metal pigment, a photolithography method using a composition for forming a colored layer, and the like. Since the colored layer 110 tends to have a taper angle θ of 60 ° or less, it is preferably formed by a photolithography method.

In the transfer method, a separation layer described later is formed on a support such as a glass plate, and a colored layer 110 is formed on the separation layer by a photolithography method using an active energy ray-curable resin composition, and then the support. The colored layer 110 can be transferred to the optical member by laminating the surface on the separation layer side exposed by peeling and the optical member via the laminating layer. When the colored layer 110 is formed by a photolithography method, an active energy ray-curable colored layer forming composition is applied onto a support or a separation layer, and a coating film of the photosensitive resin composition is exposed and then developed. After that, firing can be performed. As the exposure light source, a mercury vapor arc, a carbon arc, an Xe arc, or the like that emits light having a wavelength of 250 nm or more and 450 nm or less can be used. A glass plate or the like can be used as the support.

From the viewpoint of facilitating the formation of the tapered portion 110a having a taper angle θ of 60 ° or less, for example, the exposure conditions such as the exposure amount and the illuminance can be adjusted, and the transmission of the portion forming the tapered portion of the photomask used for exposure can be adjusted. The rate can be adjusted, and the firing conditions such as the firing temperature and time can be adjusted. A halftone mask can be used as a means for adjusting the transmittance of the photomask used during exposure. The halftone mask has a region (FT region) for irradiating an exposure amount that completely cures the colored layer forming composition and a region (HT region) for irradiating an exposure amount that causes the colored layer forming composition to be in an insufficiently cured state. A region) and a light-shielding region that does not cure the colored layer-forming composition are provided in one mask. The colored layer can be formed into a structure having a tapered portion by performing an exposure process using a halftone mask and then performing a developing process. In the total transmission region, the thickness of the colored layer is thick, in the intermediate transmission region, it becomes thin according to the exposure amount, and in the light-shielding region, the colored layer is not formed, so that a tapered portion is produced.

When the colored layer 110 is formed by the photolithography method, the composition for forming the colored layer can be an active energy ray-curable type. The composition for forming a colored layer can contain, for example, a binder resin, a colorant, a solvent, and any additive. When the composition for forming a colored layer is an active energy ray-curable type, the composition for forming a colored layer 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 polyolefin (for example, chlorinated polyethylene and chlorinated polypropylene), polyester resin, urethane resin, (meth) acrylic resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer, and cellulose resin. Resin is mentioned. The binder resin may be used alone or in combination of two or more. The binder resin may be a heat-polymerizable resin or a photopolymerizable resin. As used herein, the term "(meth) acrylic resin" refers to at least one selected from the group consisting of acrylic resins and methacrylic resins. The same applies to other terms with "(meta)".

The colorant can be black in order to facilitate the shielding effect of the non-display area B. The composition for forming a colored layer preferably contains carbon black. Colorants other than carbon black include, for example, inorganic pigments such as titanium white, zinc flower, iron black, petal handle, chrome vermilion, ultramarine blue, cobalt blue, chrome yellow, titanium yellow; phthalocyanine blue, induslen blue, iso. Organic pigments or dyes such as indolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, aniline black; metal pigments composed of scaly foil pieces such as aluminum and brass; scales such as titanium dioxide coated mica and basic lead carbonate. Examples thereof include pearl luster pigments (pearl pigments) composed of shaped foil pieces. 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 optical density of the colored layer 110 may be, for example, 2 or more, preferably 3 or more, and more preferably 4 or more in a region 20 μm or more away from the end of the colored layer 110 on the display region A side. More preferably, it is 5 or more. The upper limit is not particularly limited, but the optical density of the colored layer 110 can be, for example, 7 or less, and may be 6 or less. The optical density of the colored layer is measured by the apparatus and method described in Examples below.

The colored layer 110 may have an optical density of, for example, 1.8 or more, preferably 2 or more, more preferably 2.5 or more, and further preferably 2.7 or more per 1 μm of thickness. The optical density of the colored layer is measured by an optical density measuring device, specifically, by the method described in Examples described later.

The width of the colored layer 110 (the length of the laminated body 100 in the plane direction) is not particularly limited, and may be appropriately selected depending on the size, use, design, etc. of the laminated body. As shown in FIG. 2, when the colored layer 110 is formed on the peripheral edge of the laminated body, the width of the colored layer 110 can be, for example, 0.5 mm or more, may be 3 mm or more, and may be 5 mm or more. It may be 80 mm or less, 60 mm or less, 50 mm or less, 30 mm or less, or 20 mm or less.

(Optical member)
The optical member can be a component used in a normal image display device. The first optical member is arranged on the side opposite to the surface having the tapered portion of the colored layer. The first optical member and the colored layer can be bonded by a bonding layer described later.
When a laminate including the first optical member and the second optical member is used in the image display device, the second optical member can be attached to the image display device so as to be on the visual side, preferably the second. The optical member is attached to the image display device so as to be a layer forming the outermost surface on the visual side of the image display device.

Examples of the optical member include a polarizing plate, a front plate, a touch sensor panel, a protective film, and the like. The first optical member 120 can be a polarizing plate, a front plate, or a touch sensor panel, and is preferably a polarizing plate. The second optical member can be a polarizing plate, a front plate, a touch sensor panel, or a protective film, preferably a front plate or a protective film.

(Polarizer)
The polarizing plate may be a linear polarizing plate or a circular polarizing plate. Examples of the linear polarizing plate include a stretched film or a stretched layer on which a dichroic dye is adsorbed, a film containing a film coated with a dichroic dye and cured, and the like as a polarizer. Specifically, as the dichroic dye, iodine or a dichroic organic dye is used. For dichroic organic dyes, C.I. I. Included are dichroic direct dyes made of disuazo compounds such as DIRECT RED 39 and dichroic direct dyes made of compounds such as trisazo and tetrakisazo.

As a film to which a dichroic dye is applied and cured, which is used as a polarizer, a composition containing a dichroic dye having a liquid crystal property or a composition containing a dichroic dye and a polymerizable liquid crystal is applied and cured. Examples thereof include a film containing a cured product of a polymerizable liquid crystal compound such as a layer obtained by the above process. A film coated with a dichroic dye and cured is preferable because there is no limitation in the bending direction as compared with a stretched film or a stretched layer on which a dichroic dye is adsorbed.

The linear polarizing plate may be composed of only a polarizing element, or may further include a thermoplastic resin film, a base material, an alignment film, and a protective layer in addition to the polarizing element. The thickness of the linear polarizing plate is, for example, 2 μm or more and 100 μm or less, preferably 10 μm or more and 60 μm or less.

(1) A linear polarizing plate having a stretched film or a stretched layer as a polarizer A linear polarizing plate having a stretched film having a dichroic dye adsorbed as a polarizer will be described. A stretched film on which a dichroic dye, which is a polarizer, is adsorbed is usually bicolorized by a step of uniaxially stretching the polyvinyl alcohol-based resin film and dyeing the polyvinyl alcohol-based resin film with the bicolor dye. It can be produced through a step of adsorbing a dye, a step of treating a polyvinyl alcohol-based resin film on which a bicolor dye is adsorbed with an aqueous boric acid solution, and a step of washing with water after the treatment with the aqueous boric acid solution. Such a polarizing element may be used as it is as a linear polarizing plate, or a linear polarizing plate having a thermoplastic resin film described later bonded to one side or both sides thereof may be used. The thickness of the polarizer is preferably 2 μm or more and 40 μm or less.

The polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based 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-based resin is usually 85 mol% or more and 100 mol% or less, 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.

Next, a linear polarizing plate including a stretched layer on which a dichroic dye is adsorbed as a polarizer will be described. The stretched layer on which the dichroic dye, which is a polarizer, is adsorbed is usually a step of applying a coating liquid containing the above-mentioned polyvinyl alcohol-based resin on a base film, a step of uniaxially stretching the obtained laminated film, and uniaxial. A step of dyeing the polyvinyl alcohol-based resin layer of the stretched laminated film with a dichroic dye to adsorb the dichroic dye to form a polarizer, and the film on which the dichroic dye is adsorbed is a boric acid aqueous solution. It can be produced through a step of treating with water and a step of washing with water after treatment with an aqueous boric acid solution.
If necessary, the base film may be peeled off 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 stretched film or the polarizing element, which is a stretched layer, may be incorporated into the laminate in the 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 (polypropylene resin, etc.), a cyclic polyolefin resin (norbornen resin, etc.); a cellulose resin such as triacetyl cellulose; polyethylene terephthalate, polyethylene na. It can be a film composed of a polyester resin such as phthalate or polybutylene terephthalate; a polycarbonate resin; a (meth) acrylic resin; or a mixture thereof.

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. Yes, it is usually 5 μm or more, preferably 20 μm or more.
The thermoplastic resin film may or may not have a phase difference.
The thermoplastic resin film can be bonded to the polarizer using, for example, a bonding layer described later.

(2) A linear polarizing plate having a film coated with a dichroic dye and cured as a polarizer A linear polarizing plate having a film coated with a dichroic dye and cured as a polarizer will be described. The film used as a polarizer, to which a dichroic dye is applied and cured, is obtained by applying a composition containing a dichroic dye having a liquid crystal property or a composition containing a dichroic dye and a liquid crystal compound to a base material. Examples thereof include a film obtained by curing. The film may be used as a linear polarizing plate by peeling off the base material or together with the base material, or may be used as a linear polarizing plate in a configuration having a thermoplastic resin film on one side or both sides thereof.

The base material may be a thermoplastic resin film. The example and thickness of the base material may be the same as those exemplified in the above description of the thermoplastic resin film. The substrate may be a thermoplastic resin film having a hard coat layer, an antireflection layer, or an antistatic layer on at least one surface. The base material may have a hard coat layer, an antireflection layer, an antistatic layer, or the like formed only on the surface on the side where the polarizer is not formed. The base material may have a hard coat layer, an antireflection layer, an antistatic layer, or the like formed only on the surface on the side where the polarizer is formed.

Examples of the thermoplastic resin film include the same one as the linear polarizing plate provided with the stretched film or the stretched layer as a polarizer. The thermoplastic resin film can be attached to the polarizer using, for example, an adhesive or an adhesive.

It is preferable that the film coated with the dichroic pigment and cured is thin, but if it is too thin, the strength is lowered and the processability tends to be inferior. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 μm or more and 3 μm or less.

Specific examples of the film coated with the dichroic dye and cured include those described in JP2013-37353A, JP2013-33249, and the like.

The polarizing plate can be a circular polarizing plate including a polarizer or a linear polarizing plate (hereinafter, also referred to as a linear polarizing layer) and a retardation film. A circular polarizing plate in which the linearly polarized light layer and the retardation layer are arranged so that the absorption axis of the linearly polarized light layer and the slow axis of the retardation layer are at a predetermined angle can exhibit an antireflection function.
The retardation layer may include one layer or two or more retardation layers. The retardation layer may be one layer or two or more layers. The retardation layer may have an overcoat layer that protects the surface thereof, a base film that supports the retardation layer, and the like. Examples of the retardation layer include a retardation layer (λ / 4 layer) that gives a retardation of λ / 4, a retardation layer (λ / 2 layer) that gives a retardation of λ / 2, and a positive C layer. .. The retardation layer preferably includes a λ / 4 layer, and more preferably includes at least one of a λ / 4 layer and a λ / 2 layer or a positive C layer. When the retardation layer includes a λ / 2 layer, the λ / 2 layer and the λ / 4 layer are laminated in order from the linearly polarized light layer side. When the retardation layer contains a positive C layer, the λ / 4 layer and the positive C layer may be laminated in order from the linearly polarized light layer side, or the positive C layer and the λ / 4 layer may be laminated in order from the linearly polarized light layer side. May be good. The thickness of the retardation layer is, for example, 0.1 μm or more and 10 μm or less, preferably 0.5 μm or more and 8 μm or less, and more preferably 1 μm or more and 6 μm or less.

The retardation layer may be formed from the resin film exemplified as the material of the above-mentioned thermoplastic resin film, or may be formed from a layer in which the polymerizable liquid crystal compound is cured. The retardation layer may further include an alignment film and a base film, and is a layer composed of an adhesive or an adhesive for bonding the λ / 4 layer, the λ / 2 layer, and the positive C layer. May have.

When the retardation layer is formed from a layer obtained by curing a polymerizable liquid crystal compound, it can be formed by applying a composition containing the polymerizable liquid crystal compound to a base film and curing it. An alignment layer may be formed between the base film and the coating layer. The material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film. When the retardation layer is formed from a layer obtained by curing a polymerizable liquid crystal compound, the retardation layer may be incorporated into the laminate in the form of having an alignment layer and a base film.

The polarizing plate in which the linearly polarized light layer and the retardation layer are arranged so that the absorption axis of the linearly polarized light layer and the slow axis of the retardation layer have a predetermined angle has an antireflection function, that is, a circular polarizing plate. Can function as.
When the retardation layer includes the λ / 4 layer, the angle formed by the absorption axis of the linearly polarized light layer and the slow axis of the λ / 4 layer can be 45 ° ± 10 °. The retardation layer may have a positive wavelength dispersibility or a reverse wavelength dispersibility. The λ / 4 layer preferably has anti-wavelength dispersibility. The linearly polarized light layer and the retardation layer may be bonded to each other with an adhesive or an adhesive.
When the first optical member is a circularly polarizing plate, the laminated body preferably includes a colored layer on the linearly polarizing layer side of the circularly polarizing plate. The colored layer and the linearly polarized light layer may be bonded by a bonding layer described later. When the colored layer is formed on the protective layer or the separating layer described later, the protective layer or the separating layer and the polarizing plate may be bonded by the bonding layer described later.

When the retardation layer includes the λ / 2 layer and the λ / 4 layer, the angle Q formed by the slow axis direction of the λ / 4 layer and the absorption axis direction of the linearly polarized light layer is the absorption axis direction of the linearly polarized light layer ( The slow axis direction of the λ / 4 layer with respect to (0 °) can be set in the range of −20 ° to 20 ° with the counterclockwise direction as positive. Assuming that the angle formed by the slow axis direction of the λ / 2 layer and the absorption axis direction of the linearly polarized light layer is the angle H, the angle H is preferably −80 ° to −70 °, and is preferably −78 ° to −70 °. It is more preferably 70 °, and even more preferably −76 ° to −70 °. At this time, the angle Q is preferably −20 ° to −10 °, more preferably −18 ° to −10 °, and even more preferably −16 ° to −10 °. The angle H is preferably 80 ° to 70 °, more preferably 78 ° to 70 °, and even more preferably 76 ° to 70 °. At this time, the angle Q is preferably 20 ° to 10 °, more preferably 18 ° to 10 °, and even more preferably 16 ° to 10 °. By adjusting the slow-phase axial direction (angle H) of the λ / 2 layer and the slow-phase axial direction (angle Q) of the λ / 4 layer so as to have such a range, color change due to bending can be suppressed. Is possible.

(Adhesive layer)
The pressure-sensitive adhesive layer 150 is a layer that is interposed between the colored layer 110 and the optical member and adheres them. As used herein, the term "adhesive" is also referred to as a pressure-sensitive adhesive. On the other hand, in the present specification, the "adhesive" refers to an adhesive other than an adhesive (pressure sensitive adhesive), and is clearly distinguished from the adhesive. The pressure-sensitive adhesive layer 150 may be one layer or may be composed of two or more layers, but is preferably one layer.

The pressure-sensitive adhesive layer 150 can be composed of a pressure-sensitive adhesive composition containing a resin as a main component, such as (meth) acrylic type, rubber type, urethane type, ester type, silicone type, and polyvinyl ether type. Among them, a pressure-sensitive adhesive composition using a (meth) acrylic resin having excellent transparency, weather resistance, heat resistance and the like as a base polymer 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) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2- (meth) acrylate. A polymer or copolymer containing one or more (meth) acrylic acid esters 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 meta) acrylate.

The pressure-sensitive adhesive composition may contain only the above-mentioned base polymer, but usually further contains a cross-linking agent. The cross-linking agent is a divalent or higher metal ion that forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound that forms an amide bond with a carboxyl group; poly. Epoxy compounds and polyols that form an ester bond with a carboxyl group; polyisocyanate compounds that form an amide bond with a carboxyl group are exemplified. 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 active energy rays such as ultraviolet rays and electron beams, and has adhesiveness even before irradiation with active energy rays. It is a pressure-sensitive adhesive composition having the property of being able to adhere to an adherend such as, etc., and being cured by irradiation with active energy rays to adjust the adhesion force. The active energy ray-curable pressure-sensitive adhesive composition is preferably an ultraviolet-curable type. 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 cross-linking 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, UV absorbers, dyes, pigments, colorants, antifoaming agents, corrosion inhibitors, photopolymerization initiators and other additives can be included.

It can be formed by applying an organic solvent diluent of the above pressure-sensitive adhesive composition on a substrate and drying it. When the active energy ray-curable pressure-sensitive adhesive composition is used, the formed pressure-sensitive adhesive layer 150 can be irradiated with active energy rays to obtain a cured product having a desired degree of curing.

Since the colored layer 110 has a tapered portion 110a having a taper angle θ of 60 ° or less, the mixing of air bubbles tends to be easily suppressed when the pressure-sensitive adhesive layer 150 is attached to the colored layer 110 side. The thickness of the pressure-sensitive adhesive layer 150 is preferably thicker than the thickness of the colored layer 110, more preferably 4 μm or more, still more preferably 5 μm or more, and particularly preferably 10 μm, from the viewpoint of absorbing the step caused by the colored layer 110. That is all. The thickness of the pressure-sensitive adhesive layer 150 is preferably 100 μm or less, more preferably 50 μm or less, from the viewpoint of enhancing flexibility. The thickness of the pressure-sensitive adhesive layer 150 is the maximum thickness of the pressure-sensitive adhesive layer 150.

(Protect film)
The protective film has a function of protecting the surface of a colored layer, a polarizing plate, or the like, and can usually be a laminate of a thermoplastic composition resin film and an adhesive layer 150. The protective film is peeled off together with the pressure-sensitive adhesive layer 150 that the laminate having the protective film is attached to, for example, an image display element. The thermoplastic resin film is, for example, a polyolefin resin such as a polyethylene resin, a polypropylene resin, or a cyclic polyolefin resin; a polyester resin such as polyethylene terephthalate or polyethylene naphthalate; a polycarbonate resin; a (meth) acrylic resin or the like. Can be configured.

The thickness of the protective film can be, for example, 5 μm or more and 200 μm or less, preferably 10 μm or more and 180 μm or less, more preferably 20 μm or more and 150 μm or less, and further preferably 30 μm or more and 120 μm or less. If the thickness is less than 5 μm, the protection of the colored layer and the polarizing plate may be insufficient, and it is disadvantageous in terms of handleability. If the thickness exceeds 200 μm, it is disadvantageous in terms of cost and reworkability of the protective film.

(Front plate)
The material and thickness of the front plate are not limited as long as it is a plate-like body capable of transmitting light, and the front plate may have a single-layer structure or a multi-layer structure, and is a glass plate-like body (for example, glass). (Plate, glass film, etc.), resin plate-like body (for example, resin plate, resin sheet, resin film, etc.) are exemplified. The front plate can be a layer constituting the outermost surface of the image display device on the visual side.

As the glass plate, tempered glass for display is preferably used. The thickness of the glass plate is, for example, 20 μm or more and 1000 μm or less. By using a glass plate, it is possible to construct an optical member having excellent mechanical strength and surface hardness.

The resin film is not limited as long as it is a resin film capable of transmitting light. For example, triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, polyetherimide, poly (meth) acrylic, polyimide, polyether. Polysulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyetherketone, polyetheretherketone, polyethersulfone, polymethyl (meth) acrylate, polyethylene terephthalate, polybutylene. Examples thereof include films formed of polymers such as terephthalate, polyethylene naphthalate, polycarbonate and polyamideimide. These polymers can be used alone or in admixture of two or more. When the laminate is used for a flexible display, a resin film made of a polymer such as polyimide, polyamide, or polyamide-imide, which has excellent flexibility and can be configured to have high strength and high transparency. Is preferably used.

When the front plate is a resin film, the resin film may be a film having a hard coat layer provided on at least one surface of the base film to further improve the hardness. The hard coat layer may be formed on one surface of the base film or may be formed on both surfaces. When the image display device described later is a touch panel type image display device, the surface of the front plate serves as a touch surface, so a resin film having a hard coat layer is preferably used. By providing the hard coat layer, a resin film having improved hardness and scratchability can be obtained. 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, epoxy resin and the like. The hard coat layer may contain additives to improve strength. Additives are not limited and include inorganic fine particles, organic fine particles, or mixtures thereof. The thickness of the resin film is, for example, 30 μm or more and 2000 μm or less.

The front plate not only has a function of protecting the front surface of the image display device, but may also have a function as a touch sensor, a blue light cut function, a viewing angle adjustment function, and the like.

(Lated layer)
The bonding layer 160 is a layer composed of an adhesive or an adhesive. The bonding layer 160 can be arranged to bond the separation layer or protective layer described later to the first optical member. As the pressure-sensitive adhesive used as the material of the bonding layer, the above-mentioned pressure-sensitive adhesive composition can be used, and other pressure-sensitive adhesives, for example, a (meth) acrylic pressure-sensitive adhesive and a styrene-based pressure-sensitive adhesive different from the material of the pressure-sensitive adhesive layer 150. , Silicone-based pressure-sensitive adhesive, rubber-based pressure-sensitive adhesive, urethane-based pressure-sensitive adhesive, polyester-based pressure-sensitive adhesive, epoxy-based copolymer pressure-sensitive adhesive and the like can also be used.

The adhesive used as the material of the bonding layer 160 can be formed by combining one or more of, for example, a water-based adhesive, an active energy ray-curable adhesive, and the like. Examples of the water-based adhesive include a polyvinyl alcohol-based resin aqueous solution, a water-based two-component urethane-based emulsion adhesive, and the like. The active energy ray-curable adhesive is an adhesive that cures by irradiating with active energy rays such as ultraviolet rays, and is, for example, an adhesive containing a polymerizable compound and a photopolymerizable initiator, and an adhesive containing a photoreactive resin. , Adhesives containing a binder resin and a photoreactive cross-linking agent, and the like. Examples of the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from these monomers. Examples of the photopolymerization initiator include compounds containing substances that generate active species such as neutral radicals, anion radicals, and cationic radicals by irradiating them with active energy rays such as ultraviolet rays.

The thickness of the bonding layer 160 is not particularly limited, but when the pressure-sensitive adhesive layer is used as the bonding layer 160, it is preferably 10 μm or more, 15 μm or more, 20 μm or more, and 25 μm. It may be more than or equal to, usually 200 μm or less, 100 μm or less, or 50 μm or less. When the adhesive layer is used as the bonding layer 160, the thickness of the bonding layer 160 is preferably 0.1 μm or more, may be 0.5 μm or more, is preferably 10 μm or less, and is 5 μm. It may be as follows.

(Separation layer)
The separation layer 140 has a function for facilitating the separation between the support and the coloring layer used in the process of producing the coloring layer 110. The separation layer 140 can be, for example, an inorganic layer or an organic layer. These layers can be formed by a spin coating method, a sputtering method, a vapor deposition method, or the like. Examples of the material forming the inorganic layer include silicon oxide. Examples of the material for forming the organic material layer include (meth) acrylic resin compositions, epoxy resin compositions, and polyimide resin compositions. The colored layer and the separation layer separated from the substrate can be transferred to the first optical member via the bonding layer on the separation layer side. The thickness of the separation layer 140 may be, for example, 0.01 μm or more and 1.0 μm or less, preferably 0.05 μm or more and 0.5 μm or less.

(Protective layer)
The laminate may further include at least one protective layer in addition to or in place of the separating layer. The protective layer has a function of protecting the colored layer and flattening the step caused by the colored layer. The protective layer can be an organic layer or an inorganic layer. As the material of the inorganic layer and the organic layer, the same materials as those shown in the description of the separation layer can be used. These layers can be formed by a spin coating method, a sputtering method, a vapor deposition method, or the like. The thickness of the protective layer may be, for example, 0.1 μm or more and 10 μm or less, preferably 0.5 μm or more and 5 μm or less.

(Touch sensor panel)
The touch sensor panel can be attached to the side of the first optical member 120 opposite to the colored layer 110 side via an adhesive layer. As the touch sensor panel, as long as it is a sensor that can detect the touched position, the detection method is not limited, and the resistance film method, the capacitance coupling method, the optical sensor method, the ultrasonic method, and the electromagnetic induction coupling method are used. A touch sensor panel such as a method and a surface acoustic wave method is exemplified. Since the cost is low, a touch sensor panel of a resistance film type or a capacitance coupling type is preferably used.

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 as a resistance film on the inner front surface of each substrate. It is composed of a conductive film and a touch position detection circuit. In an image display device provided with a resistance film type touch sensor panel, when the surface of the front plate is touched, the opposing resistance films are short-circuited and a current flows through the resistance film. The touch position detection circuit detects the change in voltage at this time, and the touched position is detected.

An example of a capacitance coupling type touch sensor panel is composed of a substrate, a transparent electrode for position detection provided on the entire surface of the substrate, and a touch position detection circuit. In an image display device provided with a capacitance coupling type touch sensor panel, when the surface of the front plate 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.

(Layer structure of laminated body)
Examples of the layer structure of the laminated body include a layer structure in which the second optical member, the pressure-sensitive adhesive layer, the colored layer, the separation layer, the pressure-sensitive adhesive layer, and the first optical member are laminated in this order. Specifically, a layer structure in which a front plate, an adhesive layer, a coloring layer, a separation layer, an adhesive layer, and a circular polarizing plate are laminated in this order, a front plate, an adhesive layer, and coloring. A layer structure in which a layer, a protective layer, a separation layer, an adhesive layer, and a circularly polarizing plate are laminated in this order, a protective film, a colored layer, a separation layer, an adhesive layer, and a circularly polarizing plate. Examples thereof include a layer structure in which the protective film, a colored layer, a protective layer, a separation layer, an adhesive layer, and a circularly polarizing plate are laminated in this order. In these layer configurations, the pressure-sensitive adhesive layer may be replaced by an adhesive layer.

(Manufacturing method of laminated body)
The method for producing the laminate can be, for example, a production method including a transfer step of forming a colored layer by a transfer method. The method for producing the laminate including the transfer step is, for example, a step of preparing the support 180 [FIG. 5 (a)] and a step of forming the separation layer 140 on one surface of the support 180 [FIG. 5 (b)]. ], And a step of applying the active energy ray-curable resin composition to the surface of the separation layer 140 opposite to the support 180 side to form the coating film 111 of the active energy ray-curable resin composition [FIG. 5 (FIG. 5). c)], a step of forming the colored layer 110 by a photolithography method [FIG. 5 (d)], a step of laminating the process film 112 on the colored layer 110 [FIG. 5 (e)], and a support 180. [FIG. 5 (f)] and a step of transferring the colored layer 110 by bonding the separation layer 140 side of the colored layer 110 to the optical member 120 via the bonding layer 160 [FIG. 5 (g)]. ], The process of peeling the process film 112 [FIG. 5 (h)], the process of bonding the pressure-sensitive adhesive layer 150 to the colored layer 110 side of the separation layer 140 [FIG. 5 (i)], and the optical member 130. It can include a step [FIG. 5 (j)] of laminating through the pressure-sensitive adhesive layer 150 to obtain the laminated body 100.

In the transfer method, for example, a separation layer is formed on a support, a cured film of a composition for forming a coloring layer is formed on the separation layer to obtain a colored layer laminate, and the colored layer side of the colored layer laminate and an optical member. It can be done by sticking and removing the support. As the support, for example, a glass plate or the like can be used.

As a method of forming the colored layer 110 on the separation layer 140, a photolithography method can be used as described above.

The optical member, the pressure-sensitive adhesive layer, the colored layer, and the bonding layer can be bonded using a known device such as a laminator, a roll, or a cell joining machine. The bonding surface of the optical member, the pressure-sensitive adhesive layer, the coloring layer, and the bonding layer can be subjected to surface treatment such as corona treatment or plasma treatment.

<Image display device>
The image display device according to the present invention includes the above-mentioned laminated body. The image display device is not particularly limited, and examples thereof include an image display device such as an organic EL display device, an inorganic EL display device, a liquid crystal display device, and an electroluminescent display device. The image display device may have a touch panel function. The laminate is suitable for a flexible image display device that can be bent or bent. In the image display device, when the laminate has a front plate, the laminate is arranged on the visual side of the image display device with the front plate facing the outside (the side opposite to the image display element side, that is, the visual viewing side). ..

The image display device according to the present invention can be used as a mobile device such as a smartphone or tablet, a television, a digital photo frame, an electronic signboard, a measuring instrument or an instrument, an office device, a medical device, a computer device, or the like. The image display device according to the present invention has excellent flexibility and is therefore suitable for a flexible display or the like.

Hereinafter, the present invention will be described in more detail with reference to Examples. Unless otherwise specified, "%" and "part" in the example are mass% and parts by mass.

[Measurement of optical density]
A colored layer was formed on the glass substrate by the same procedure as in each Example and Comparative Example. This sample was set in an optical density measuring instrument (product name: 361T, manufactured by X-rite), and the upper light source located on the colored layer side of the sample was turned on to focus on the colored layer of the sample. After turning off the upper light source, the measurement light source located on the substrate side of the sample was turned on, and the optical density was measured with the colored layer as the measurement region.

[Measurement of thickness, taper width and taper angle of colored layer]
The cross sections of the laminates produced in Examples and Comparative Examples were observed with a transmission electron microscope. As shown in FIG. 6, in the obtained observation image, the thickness T was measured as the thickness of the colored layer, the width W was measured as the taper width, and the angle θ was measured as the taper angle. The thickness of the colored layer is the maximum thickness of the colored layer, which is the thickness of a region separated by 20 μm or more from the end portion of the colored layer on the display region side. The taper width separates a straight line connecting a point on the surface of the separation layer at the end of the coloring layer on the display region side and a point on the upper surface of the coloring layer (the surface opposite to the separation layer side) where the thickness starts to become constant. The length of the straight line projected onto the layer surface. The taper angle is a straight line connecting a point on the surface of the separation layer at the end of the coloring layer on the display region side and a point where the upper surface of the coloring layer (the surface opposite to the separation layer side) begins to become smooth, and the coloring layer. The angle formed by the surface of the separation layer on the side.

[Bubble evaluation]
As shown in FIG. 7A, the laminates produced in Examples and Comparative Examples were bent so that the circularly polarizing plate side of the laminate was on the inside and fixed to the bending tester, and the temperature was 80 in that state. It was kept in an oven at ° C for 240 hours.
After that, the laminate taken out from the oven and removed from the bending tester was visually observed from the colored layer side, and the following bubble length WL was measured for the bubbles generated on the display area side of the boundary between the non-display area and the display area. Then, the degree of bubble generation was evaluated according to the following criteria.
(Bubble length WL)
Regarding the bubbles observed when the laminated body is visually observed vertically downward from the colored layer side, as shown in FIG. 7 (b), the two points where the linear distance is the longest in the contour 103 forming the appearance shape of the bubbles. The arithmetic average [= (W1 + W2) / 2] of the distance W1 between the two points and the distance W2 between the two points where the length of the bubble is the longest in the direction orthogonal to the straight line passing between the two points is defined as the bubble length WL. did. When multiple bubbles were observed, the largest arithmetic mean was taken as the bubble length WL.
(Evaluation criteria)
A: Bubbles with a bubble length of less than 10 μm are generated.
B: Bubbles with a bubble length WL of 10 μm or more and less than 15 μm are generated.
C: Bubbles with a bubble length WL of 15 μm or more are generated.

[Preparation of protective film]
A polyethylene terephthalate resin (PET) film with an adhesive layer (adhesive: acrylic pressure-sensitive adhesive, pressure-sensitive adhesive layer thickness: 25 μm, PET film thickness: 75 μm) was prepared.

[Manufacturing of linear polarizing plate]
A polyvinyl alcohol (PVA) film having an average degree of polymerization of about 2,400, a saponification degree of 99.9 mol% or more, and a thickness of 20 μm was prepared. After immersing the PVA film in pure water at 30 ° C, it was immersed in an aqueous solution having a mass ratio of iodine / potassium iodide / water of 0.02 / 2/100 at 30 ° C to perform iodine dyeing (iodine dyeing step). .. The PVA film that had undergone the iodine dyeing step was immersed in an aqueous solution having a mass ratio of potassium iodide / boric acid / water of 12/5/100 at 56.5 ° C. to perform boric acid treatment (boric acid treatment step). .. The PVA film that had undergone the boric acid treatment step was washed with pure water at 8 ° C. and then dried at 65 ° C. to obtain a polarizer in which iodine was adsorbed and oriented on polyvinyl alcohol. The PVA film was stretched in the iodine dyeing step and the boric acid treatment step. The total draw ratio of the PVA film was 5.3 times. The thickness of the obtained polarizer was 7 μm.

A nip roll of the polarizer obtained above and a cycloolefin polymer (COP) film (ZF-14, manufactured by Nippon Zeon Corporation, having an in-plane retardation value of 1 nm at a wavelength of 550 nm) having a thickness of 13 μm via an aqueous adhesive. I pasted them together. While maintaining the tension of the obtained laminate at 430 N / m, it was dried at 60 ° C. for 2 minutes to obtain a linear polarizing plate having a COP film on one side. The water-based adhesive is 100 parts of water, 3 parts of carboxyl group-modified polyvinyl alcohol ("Kuraray Poval KL318", manufactured by Kuraray Co., Ltd.) and water-soluble polyamide epoxy resin ("Smiley's resin 650" (solid content concentration 30%). (Aqueous solution) and 1.5 parts (manufactured by Taoka Chemical Industry Co., Ltd.) were added to prepare the mixture.

[Preparation of retardation film]
As the λ / 2 layer, a film (thickness 2 μm) composed of a layer on which the liquid crystal compound was cured and an alignment film was prepared. As the λ / 4 layer, a film (thickness 1 μm) composed of a layer on which the liquid crystal compound was cured and an alignment film was prepared. The λ / 2 layer and the λ / 4 layer were bonded together via an adhesive layer (thickness 2 μm) made of an ultraviolet curable adhesive.

[Preparation of circularly polarizing plate]
The polarizer side of the linear polarizing plate and the λ / 2 layer side of the retardation film were bonded to each other via an acrylic pressure-sensitive adhesive layer (5 μm). A circularly polarizing plate (thickness 30 μm, layer structure: COP / polarizer / retardation film) produced in this manner was obtained. The λ / 2 layer of the retardation layer was arranged so that its slow axis formed an angle of −75 ° with respect to the absorption axis of the linear polarizing plate when it was attached to the linear polarizing plate. Further, the λ / 4 layer of the retardation layer was arranged so that its slow axis formed an angle of −15 ° with respect to the absorption axis of the linear polarizing plate when it was attached to the linear polarizing plate.

[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 2 for forming a colored layer]
(Ink component)
Acetylene black (carbon black) 15% by mass, polyester 75% by mass, glutaric acid dimethyl ester 2.5% by mass, succinic acid 2% by mass, isophorone 5.5% by mass
(Hardener)
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 stirred to obtain a colored layer forming composition 2.

<Example 1>
(1) Colored layer forming step A separation layer was formed by coating a glass plate with an acrylic resin. On the separation layer, the coloring layer was patterned using the above-mentioned composition 1 for forming a coloring layer so that the thickness after drying was 1.8 μm. The colored layer surrounds a rectangular display area as shown in FIG. 2 by a photolithography method (including the following steps: coating step, exposure step, developing step and thermosetting step of the composition 1 for forming a colored layer). It was formed as a hidden area. The end region on the display region side of the colored layer had a tapered portion, and the colored layer was a single layer. In the above exposure step, the halftone mask 1 was used. In the halftone mask 1, the total light transmittance in the HT region for forming the tapered portion shown in FIG. 8 was 95%, and the total light transmittance in the FT region was 100%. The width Wa of the HT region was 10 μm. The total light transmittance in the HT region was adjusted by the thickness of the inorganic film formed on one side of the halftone mask. A process film was attached onto the obtained colored layer.

(2) Laminating Step The COP film side of the circularly polarizing plate was bonded to the surface on the separation layer side exposed by peeling the glass plate via the bonding layer (thickness 3 μm, ultraviolet curable adhesive). Next, the surface of the colored layer side exposed by peeling the process film was bonded to the adhesive layer of the protective film. Then a laminate was obtained. The evaluation results are shown in Table 1.

<Example 2>
A laminate was produced in the same manner as in Example 1 except that the halftone mask 2 having a transmittance of 90% in the HT region and 100% of the transmittance in the FT region was used. The evaluation results are shown in Table 1.

<Example 3>
A laminate was produced in the same manner as in Example 1 except that the halftone mask 3 having a transmittance of 50% in the HT region and 100% of the transmittance in the FT region was used. The evaluation results are shown in Table 1.

<Example 4>
A laminate was produced in the same manner as in Example 1 except that the halftone mask 4 having a transmittance of 10% in the HT region and 100% of the transmittance in the FT region was used. The evaluation results are shown in Table 1.

<Comparative example 1>
A laminate was produced in the same manner as in Example 1 except that the mask 1 having 100% transmittance in both the HT region and the FT region was used. The evaluation results are shown in Table 1.

<Comparative example 2>
The colored layer forming composition 2 prepared above as an ink is repeatedly printed twice by a screen printing method to have a coating thickness of 5 μm after drying, and a multilayer structure is formed on a COP film in a circularly polarizing plate. A colored layer having the above was formed. The thickness of this colored layer was 10 μm. A 460 mesh screen was used as the screen. A protective film was attached to the circularly polarizing plate so as to cover the colored layer. The evaluation results are shown in Table 1.

100, 200 laminate, 101 display area, 102 non-display area, 110 colored layer, 110a taper part, 110b taper width, 111 coating film, 112 process film, 120 first optical member, 130 second optical member, 140 separation layer , 150 adhesive layer, 160 bonded layer, 180 support, A display area, B non-display area, θ taper angle, T thickness, W taper width, WL bubble length, distance between W1, W2 two points, Wa HT area width.

Claims (9)

1. A laminated body including a colored layer and a first optical member.
   The laminated body is divided into a display area and a non-display area in a plan view.
   The colored layer is provided in the non-display area and is provided.
   The colored layer has a single layer structure and has a single layer structure.
   The end region of the colored layer on the display region side has a tapered portion on the surface opposite to the first optical member side, which reduces the thickness on the display region side.
   A laminated body in which the taper angle of the tapered portion is 60 ° or less with respect to the surface of the colored layer on the side of the first optical member.
2. The laminate according to claim 1, wherein the thickness of the colored layer is less than 10 μm.
3. The laminate according to claim 1 or 2, wherein the colored layer has an optical density of 5 or more.
4. The laminate according to any one of claims 1 to 3, wherein the colored layer contains carbon black.
5. The laminate according to any one of claims 1 to 4, further comprising a separation layer between the colored layer and the first optical member.
6. The laminate according to any one of claims 1 to 5, wherein the first optical member is a polarizing plate.
7. The laminate according to any one of claims 1 to 6, further comprising a second optical member laminated via an adhesive layer on the side of the colored layer opposite to the first optical member side.
8. The laminate according to claim 7, wherein the second optical member is a protective film.
9. An image display device comprising the laminate according to any one of claims 1 to 8.

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