TW202019686A - Optical laminate and method for manufacturing same - Google Patents

Abstract

Provided are: an optical laminate comprising a colored layer that has excellent shielding properties, the level of white tint of the colored layer being adjusted; and a method for manufacturing the optical laminate. The optical laminate comprises a front panel, a laminated layer, and a rear panel in the stated order, and comprises a colored layer provided in a portion of the front-panel-side surface of the rear panel. The arithmetic mean roughness Ra1 of the front-panel-side surface of the colored layer is 0.15 [mu]m or less, and the optical density of the colored layer is 5 or greater.

Description

Optical laminate and manufacturing method thereof

The invention relates to an optical layered body and a manufacturing method thereof.

For various image display devices such as a liquid crystal display device or an organic electroluminescence (EL) display device, in order to protect the display panel, a front panel is sometimes provided on the viewing side of the display panel. For such a front panel, a non-display area may be provided in order to conceal electrodes, wiring, etc. or to suppress light leakage from light leakage from the display panel side (for example, Patent Documents 1 and 2). Patent Documents 1 and 2 describe forming a non-display area as a colored layer. [Prior Technical Literature] [Patent Literature]

[Patent Literature 1] Korean Patent Publication No. 10-2015-0042046 [Patent Document 2] Korean Patent Publication No. 10-2017-0039809 [Patent Document 3] Korean Patent Publication No. 10-2008-0055335

[Problems to be solved by the invention]

In the case of forming a non-display area as a colored layer, it is necessary to form a colored layer that can conceal electrodes, wiring, etc., and has a sufficient shielding property that can suppress light leakage. The above non-display area may be provided on the front panel side of the display panel instead of the front panel. In this case, the inventors found that even if the concentration of the coloring agent in the coloring layer is increased in order to make a coloring layer with sufficient shielding property, the coloring layer may also be white and the desired color tone may not be obtained . For example, in the case of forming a black coloring layer, even if the concentration of the black coloring agent is increased, it cannot become a black coloring layer, but becomes a gray coloring layer.

An object of the present invention is to provide an optical layered body and a method for manufacturing the same. The optical layered body has a color layer with good shielding properties, and the degree of whiteness of the color layer is adjusted. [Technical means to solve the problem]

The present invention provides the following optical laminates and methods for manufacturing the same. [1] An optical laminate having a front panel, a bonding layer, and a back panel in sequence, and Having a coloring layer provided on a part of the surface of the front panel side of the back panel, The arithmetic average roughness Ra1 of the surface of the colored layer on the front panel side is 0.15 μm or less, The optical density of the colored layer is 5 or more. [2] The optical laminate according to [1], wherein the arithmetic average roughness Ra1 is 0.1 μm or less. [3] The optical laminate according to [1] or [2], wherein the colored layer includes a first layer disposed on the outermost surface of the front panel side, and a layer disposed on the back panel side of the first layer Layer 2. [4] The optical laminate according to [3], wherein the arithmetic average roughness Ra2 of the surface of the second layer on the front panel side is larger than the arithmetic average roughness Ra1. [5] The optical laminate according to [3] or [4], wherein the second layer contains a colorant, The colorant contains at least a pigment. [6] The optical laminate according to [5], wherein the concentration of the pigment in the second layer is greater than the concentration of the pigment in the first layer. [7] The optical laminate according to [6], wherein the thickness of the first layer is smaller than the thickness of the second layer. [8] The optical laminate according to any one of [5] to [7], wherein the pigment is a black pigment. [9] The optical laminate according to any one of [1] to [8], wherein the colored layer is provided on at least a part of a peripheral portion of the optical laminate. [10] The optical laminate according to any one of [1] to [9], wherein the back plate includes at least one of a polarizing plate and a touch sensor panel. [11] A method for manufacturing an optical laminate, which is the method for manufacturing an optical laminate according to any one of [1] to [10], and It includes the step of forming the colored layer by screen printing on the back plate. [12] The method for manufacturing an optical laminate according to [11], wherein the colored layer includes a first layer disposed on the outermost surface of the front panel side, and a first layer disposed on the back panel side of the first layer 2 layer, The step of forming the colored layer includes a step of forming the second layer by screen printing on one side of the back plate, and a step of forming the first layer by screen printing on the opposite side of the back plate of the second layer Steps. [Effect of invention]

According to the present invention, it is possible to provide an optical layered body having a coloring layer having good shielding properties, and adjusting the degree of whiteness of the colored layer.

Hereinafter, the 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, in order to facilitate understanding of each component, it is shown by adjusting the ratio appropriately. The ratio of each component shown in the drawing may not necessarily match the actual ratio of the component.

(Optical laminate) FIG. 1 is a schematic cross-sectional view schematically showing an example of the optical laminate in this embodiment. FIG. 2 is a schematic plan view of the optical laminate shown in FIG. 1 viewed from the front panel side. The optical laminate 100 includes a front panel 10, a bonding layer 20, and a back panel 30 in this order from the viewing side. The optical laminate 100 further includes a colored layer 40 that is provided on a portion of the surface of the back panel 30 on the front panel 10 side. The colored layer 40 can be directly connected to the bonding layer 20. The optical laminate 100 may constitute an image display device as described later.

The optical laminate 100 is preferably bendable. The optical laminate 100 can be bent, and can be used for an image display device (flexible display) that can be bent or wound.

The shape of the optical laminate 100 in the plane direction is not particularly limited, but it is preferably a square shape, and more preferably a rectangular shape. When the optical laminate 100 has a rectangular shape, the length of the long side is preferably 50 mm to 300 mm, and may be 100 mm to 280 mm, and the length of the short side is preferably 30 mm to 250 mm, or 60. mm～220 mm. The optical laminate 100 may be a rounded square shape obtained by performing R processing on at least one corner of a square shape, or may be a square shape having a notch on at least one side. In addition, the optical laminate 100 may be provided with a hole penetrating in the stacking direction.

The thickness of the optical laminate 100 is not particularly limited, but is preferably 40 μm to 300 μm, and may be 70 μm to 200 μm. The thickness of the optical laminate 100 can be adjusted according to the functions of the front panel 10 and the back panel 30.

(Coloring layer) As long as the colored layer 40 is provided on a part of the surface on the front panel 10 side of the back panel 30, the arrangement position, shape, color, etc. in the plane direction are not limited. The colored layer 40 is preferably provided on at least a part of the peripheral portion of the surface direction orthogonal to the stacking direction of the optical layered body 100. As shown in FIG. 2, it may also be provided on the entire peripheral portion of the optical layered body 100 in the surface direction. By providing the colored layer 40 so as to rim the peripheral portion of the optical layered body 100, the colored layer 40 is regarded as a frame, so that the designability can be improved.

The optical layered body 100 can be divided into a display area A and a non-display area B in a plane direction orthogonal to the stacking direction. In this case, as shown in FIG. 1, it is preferable to provide the colored layer 40 in the non-display area B. In the case where the optical laminate 100 constitutes an image display device as described later, the display area A of the optical laminate 100 becomes an area where an image is displayed, and the non-display area B becomes an area where no image is displayed. Therefore, in the non-display area B, there are cases where it is required to arrange electrodes or wiring, or to suppress light leakage from light leakage from the display unit provided in the image display device. In this case, the coloring layer 40 provided in the non-display area B preferably has the concealability of the electrodes or wiring, etc., and the sufficient concealability to the extent that light leakage can be suppressed.

The colored layer 40 may have a single layer structure, or may have a multilayer structure in which two or more layers are stacked in the stacking direction. When the colored layer 40 has two or more layers, the layers can be in contact with each other in the stacking direction. For example, as shown in FIG. 1, the coloring layer 40 may include two layers including a first layer 40 a disposed on the outermost surface of the front panel 10 and a second layer 40 b disposed closer to the back panel 30 than the first layer 40 a. structure. In the case where the colored layer 40 has a multilayer structure of two or more layers, each layer can be distinguished by the type or content of the colorant, the arithmetic average roughness on the front panel 10 side, the color tone, and the like.

The arithmetic average roughness Ra1 of the surface of the coloring layer 40 before the panel 10 side is 0.15 μm or less, preferably 0.12 μm or less, more preferably 0.1 μm or less, and may be 0.08 μm or less, usually 0.01 μm or more. In the case where the colored layer 40 has the first layer 40 a and the second layer 40 b as shown in FIG. 1, the arithmetic average roughness Ra1 of the surface of the colored layer 40 on the side of the front panel 10 becomes the first on the outermost surface of the front panel 10. The arithmetic average roughness of the surface of the panel 10 side before the first layer 40a. The arithmetic average roughness can be measured by the method described in the examples described later. The arithmetic average roughness Ra1 of the colored layer 40 can be determined by the type or content of the coloring agent (for example, pigment, etc.) or additives contained in the colored layer 40, the method of forming the colored layer 40, and drying after applying ink or paint Adjust the method.

In the optical laminate 100, since the colored layer 40 is provided on the back plate 30, when the colored layer 40 is observed through the front panel 10 and the bonding layer 20 from the visible side of the optical laminate 100, the colored layer 40 is recognized The surface of the front panel 10 side. The larger the arithmetic average roughness Ra1 of the surface of the coloring layer 40 before the panel 10 side, the easier the light scatters on the surface of the coloring layer 40. Therefore, it is considered that the coloring layer 40 tends to have a whitish hue. By setting the arithmetic average roughness Ra1 (the arithmetic average roughness of the surface of the panel 10 side before the first layer 40a) to 0.15 μm or less, the color layer 40 can be The white color of the band is adjusted to an excessive white color, so that the color tone of the coloring layer 40 recognized from the side of the front panel 10 of the optical laminate 100 is good. In addition, by setting the arithmetic average roughness Ra1 of the surface of the colored layer 40 before the panel 10 side to 0.1 μm or less, it is possible to further suppress the colored layer 40 from being regarded as white. In this way, by controlling the arithmetic average roughness Ra1 of the surface of the colored layer 40, the colored layer 40 can be adjusted to a desired hue, for example, from gray-black to black, according to the specifications of the product.

The optical density of the colored layer 40 is 5 or more, may be 5.05 or more, or may be 5.10 or more. The optical density of the colored layer 40 can be measured by the method described in the examples described later. The greater the optical density of the colored layer 40, the higher the shielding property of the colored layer 40, so the easier it is to improve the concealment of the electrode or wiring, the easier it is to suppress light leakage from the display unit. The optical density of the colored layer 40 can be adjusted by the type or content of the coloring agent contained in the colored layer 40, the thickness of the colored layer 40, and the like.

The coloring layer 40 may contain a coloring agent. The coloring agent may be a pigment or a dye. The coloring layer 40 may include one or more than two coloring agents. Examples of the colorant include inorganic pigments such as carbon black such as acetylene black, iron black, titanium dioxide, zinc white, red lead, molybdenum cadmium red, ultramarine blue, cobalt blue, chrome yellow, and titanium yellow; phthalocyanine blue and indanthrene Organic pigments or dyes such as forest blue, isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, aniline black; metal pigments including scaly foils such as aluminum and brass; Pearlescent pigments (pearlescent pigments) containing flaky foils such as titanium dioxide coated mica, alkaline lead carbonate, etc.

When the colorant contains a pigment, the arithmetic average particle diameter of the pigment is preferably 1 nm or more and 500 nm or less, preferably 10 nm or more and 100 nm or less, more preferably 10 nm or more and 70 nm, and may be 32 nm or more 52 Below nm. The particle size distribution is, for example, 10 nm or more and 400 nm or less. The arithmetic average particle size and particle size distribution of the pigment can be imaged with an electron microscope (for example, "SU8010" manufactured by Hitachi High-Technologies Corporation), and any 100 particles can be measured from the obtained image. The diameter is calculated based on this, and the arithmetic average particle diameter can be calculated from the average of 100 measured particle diameters.

When the coloring agent contained in the colored layer 40 contains a pigment, the arithmetic average roughness of the surface of the colored layer 40 tends to increase. Therefore, when the coloring layer 40 contains a pigment, by adjusting the arithmetic average roughness Ra1 of the surface of the coloring layer 40 and the optical density of the coloring layer 40 to the above range, it can be adjusted to suppress the whiteness of the coloring layer 40, And can obtain good shielding. In addition, when the pigment contained in the coloring layer 40 is a black pigment such as carbon black, the color change becomes significant when the coloring layer 40 is whitish. Therefore, it is preferred that when the coloring layer 40 contains a black pigment, The arithmetic average roughness Ra1 and optical density are set in the above-mentioned range.

In the case where the colored layer 40 has a multilayer structure of two or more layers, the type or concentration of the coloring agent contained in each layer is not particularly limited, and may be the same or different from each other.

When the colored layer 40 includes the first layer 40a and the second layer 40b, and the colored layer 40 includes the pigment, it is preferable that at least the second layer 40b includes the pigment. The first layer 40a may or may not contain pigment. The concentration of the pigment in the second layer 40b is preferably greater than the concentration of the pigment in the first layer 40a. If the pigment concentration of the layer containing the pigment is increased, the color of the layer will be thicker and the shielding property will be improved, but the arithmetic average roughness of the surface of the layer tends to become larger. In contrast to this, if the pigment concentration of the layer containing the pigment is reduced, the arithmetic average roughness of the surface of the layer can be reduced, but the color of the layer becomes lighter and the shielding property is reduced. Therefore, the pigment concentration of the first layer 40a disposed on the outermost surface of the front panel 10 side is reduced, and the arithmetic average roughness Ra1 of the surface of the panel 10 side before the colored layer 40 is reduced, and the arrangement is closer to the back panel than the first layer 40a The pigment concentration of the second layer 40b on the 30 side increases the optical density of the colored layer 40, whereby the colored layer 40 has good shielding properties, and can be adjusted to suppress the whiteness of the colored layer 40.

The concentration of the pigment in the second layer 40b may be greater than the concentration of the pigment in the first layer 40a, and the thickness of the first layer 40a may be smaller than the thickness of the second layer 40b. In the case where the concentration of the pigment contained in the first layer 40a is low, even if the thickness of the first layer 40a is reduced, the arithmetic average roughness of the surface of the colored layer 40 is not likely to increase. Furthermore, by increasing the thickness of the second layer 40b having a higher pigment concentration, the optical density of the colored layer 40 can be increased. Therefore, by setting the relationship between the concentration and thickness of the pigments of the first layer 40a and the second layer 40b as described above, the colored layer 40 has good shielding properties and can be adjusted to suppress the whiteness of the colored layer 40.

In the colored layer 40, the arithmetic average roughness Ra2 of the surface of the panel 10 side before the second layer 40b is not particularly limited, and it can be set to be greater than the arithmetic average roughness Ra1 of the surface of the panel 10 side before the colored layer 40 (first layer The arithmetic average roughness of the surface of the panel 10 side before 40a). As described above, when the concentration of the pigment in the second layer 40b is greater than the concentration of the pigment in the first layer 40a, the arithmetic average roughness Ra2 tends to be larger than the arithmetic average roughness Ra1. However, since the first layer 40a is provided on the panel 10 side before the second layer 40b, light scattering on the surface of the colored layer 40 before the panel 10 side can be suppressed, and thus it can be adjusted to suppress the whiteness of the colored layer 40.

The arithmetic average roughness Ra2 of the surface on the side of the panel 10 before the second layer 40b is not particularly limited. For example, it can be 0.12 μm or more, more than 0.15 μm, 0.17 μm or more, or 0.2 μm or more. The arithmetic average roughness Ra2 can be set to, for example, 0.5 μm or less.

The color of the colored layer 40 is not particularly limited, and can be appropriately selected according to the use or design. Examples of the color of the colored layer 40 include black, red, navy blue, silver, and gold, and colors other than white are preferred. When the colored layer 40 has a multi-layer structure of two or more layers, the colors of the layers may be the same or different from each other.

As shown in FIG. 1, the colored layer 40 may have a uniform thickness and a rectangular cross-sectional shape. The thickness of the colored layer 40 may also be non-uniform. For example, the colored layer 40 may have a cross-sectional shape such as a tapered portion whose thickness decreases inward. By having a tapered portion, it is possible to suppress the entrapment of air that is likely to be generated during lamination.

The thickness of the colored layer 40 is preferably 30 μm or less, and more preferably 15 μm or less. When the thickness of the colored layer 40 is within the above range, the durability when bending the optical laminate 100 can be improved. The thickness of the colored layer 40 is preferably 3 μm or more, and more preferably 6 μm or more. When the thickness of the colored layer 40 is 3 μm or more, the shielding property is improved, and the colored layer 40 becomes easily visible, which contributes to the improvement of designability. In addition, in the case where the thickness of the colored layer 40 is not uniform, the numerical range described above as the thickness of the colored layer 40 is the maximum thickness of the colored layer 40.

As shown in FIG. 1, the first layer 40a and the second layer 40b may have a uniform thickness and a rectangular cross-sectional shape, and the thickness of the first layer 40a and the second layer 40b may also be non-uniform, for example, may have a thickness toward the inside The cross-sectional shape of the thinned tapered portion. The thickness or shape of the first layer 40a and the second layer 40b may be the same or different from each other. Among them, it is preferable that the first layer 40a and the second layer are formed by setting the second layer 40b on the back surface 30 side of the first layer 40a as the first layer 40a on the outermost surface of the colored layer 40 before the panel 10 side. Layer 40b is laminated.

The thickness of the first layer 40a is preferably 10 μm or less, more preferably 7 μm or less, and further preferably 5 μm or less. In addition, the thickness of the second layer 40b is preferably 27 μm or less, more preferably 25 μm or less, and may be 20 μm or less or 15 μm or less. When the thickness of the first layer 40a or the second layer 40b is not uniform, the numerical range described above as the thickness of the first layer 40a or the second layer 40b is the maximum thickness of the first layer 40a or the second layer 40b. The thickness of the first layer 40a and the thickness of the second layer 40b can be set to, for example, 0.5 μm or more.

The width of the colored layer 40 (the length in the plane direction of the optical laminate 100) is not particularly limited, and can be appropriately selected according to the size, use, or design of the optical laminate 100. As shown in FIG. 2, when the coloring layer 40 is formed on the peripheral portion of the optical layered body, the width of the colored layer 40 can be set to, for example, 0.5 mm or more, 3 mm or more, or 5 mm or more. 80 mm or less, 60 mm or less, 50 mm or less, 30 mm or less, or 20 mm or less.

The colored layer 40 can be formed by a printing method using ink or paint, a vapor deposition method using powder of metal pigments, a coloring layer 40 containing metal pigments formed in advance, and then transferred. Also, these methods may be combined. The colored layer 40 is preferably formed on the surface of the back plate 30 by a printing method. Examples of the printing method include screen printing, gravure printing, offset printing, transfer printing of a self-transfer sheet, and inkjet printing. It is also possible to form the coloring layer 40 with a desired thickness by repeatedly printing by the printing method. When the colored layer 40 has a multi-layer structure, each of the above-described forming methods may be repeatedly performed to form each layer, or each of the above-described forming methods may be combined to form each layer. For example, the coloring layer 40 having the first layer 40a and the second layer 40b shown in FIG. 1 can be formed by the step of forming the second layer 40b on the surface of the back panel 30 by screen printing, and printing on the The second layer 40b is formed by the step of forming the first layer 40a on the side opposite to the back plate 30 side.

The ink or coating used to form the coloring layer 40 may also contain binders, colorants, solvents, arbitrary additives, and the like. Examples of the binder include chlorinated polyolefins (for example, chlorinated polyethylene and chlorinated polypropylene), polyester resins, urethane resins, acrylic resins, vinyl acetate resins, and vinyl chloride-acetic acid. Vinyl ester copolymer, cellulose resin. The binder resin can be used alone or in combination of two or more. The binder resin may be a thermally polymerizable resin or a photopolymerizable resin. In the case where the coloring layer 40 is formed by a printing method, it is preferable to use ink or paint containing 50 parts by mass or more and 200 parts by mass or less of a coloring agent with respect to 100 parts by mass of the binder resin.

In the case where the colored layer 40 has a multilayer structure of two or more layers, the binder components contained in the ink or paint used to form each layer are preferably the same. Thereby, the refractive index difference between the layers forming the coloring layer 40 can be reduced.

In the above, the case where the colored layer 40 has a two-layer structure has been mainly described, but the colored layer may have a multilayer structure of three or more layers. For example, when the coloring layer 40 shown in FIG. 1 further has a third layer, the third layer may be disposed between the first layer 40a and the second layer 40b, or may be disposed between the second layer 40b and the back panel 30 between.

(Front panel) As long as the front panel 10 is a plate-shaped body that can transmit light, the material and thickness are not limited, and it may have a single-layer structure or a multilayer structure, and may exemplify a plate-shaped body made of glass (for example, glass plate, glass film) Etc.), resin-made plate-like bodies (for example, resin plates, resin sheets, resin films, etc.). The front panel 10 may be a layer constituting the outermost surface of the image display device.

As the glass plate, tempered glass for display can be preferably used. The thickness of the glass plate is, for example, 50 μm to 1000 μm. By using a glass plate, the front panel 10 having excellent mechanical strength and surface hardness can be constructed.

The resin film is not limited as long as it can transmit light. For example, triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, acetyl cellulose, butyl cellulose, acetyl propyl cellulose, polyester, polystyrene, Polyamide, polyetherimide, poly(meth)acrylic acid, polyimide, polyether sock, poly sock, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride , Polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyether sulfone, polymethyl (meth) acrylate, polyethylene terephthalate, polybutylene terephthalate , Polyethylene naphthalate, polycarbonate, polyimide amide imide and other polymers formed by the film. These polymers can be used alone or in combination of two or more. In the case where the image display device 300 is a flexible display, it can be preferably used from polyimide, polyamide, which can be configured to have excellent flexibility and have high strength and high transparency. A resin film made of polymers such as polyamidoamide and imine.

The resin film may be a film provided with a hard coat layer on at least one side of the base film to further increase the hardness. The hard coat layer can be formed on one side of the base film or on both sides. In the case where the image display device described later is an image display device of a touch panel method, since the surface of the front panel 10 becomes a touch surface, a resin film having a hard coat layer can be preferably used. By providing a hard coat layer, a resin film with improved hardness and scratch resistance can be made. The hard coat layer is, for example, a hardened layer of ultraviolet-curable resin. Examples of the ultraviolet curable resins include (meth)acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. In order to increase the strength, the hard coat layer may also contain additives. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, and mixtures of these. The thickness of the resin film is, for example, 30 μm to 2000 μm.

The front panel 10 may not only have a function of protecting the front surface of the image display device, but also have a function as a touch sensor, an anti-blue light function, a viewing angle adjustment function, and the like.

(Laminated layer) The bonding layer 20 is a layer interposed between the front panel 10 and the back panel 30 to bond these layers, and is an adhesive layer or an adhesive layer. From the viewpoint that the step difference generated by the coloring layer 40 can be well absorbed, the bonding layer 20 is preferably an adhesive layer. Furthermore, the base material forming the bonding layer 20 can generally be set to a material having a composition different from that of the binder component contained in the ink or paint forming the colored layer 40.

The adhesive layer may contain an adhesive composition mainly composed of resins such as (meth)acrylic, rubber, urethane, ester, silicone, and polyvinyl ether. Among them, an adhesive composition based on a (meth)acrylic resin excellent in transparency, weather resistance, heat resistance, etc. as a base polymer is preferred. The adhesive composition may be active energy ray hardening type or thermosetting type.

As the (meth)acrylic resin (base polymer) used in the adhesive composition, for example, butyl (meth)acrylate, ethyl (meth)acrylate, (meth) One or more (meth)acrylates such as isooctyl acrylate and 2-ethylhexyl (meth)acrylate are monomeric polymers or copolymers. Preferably, the polar monomer is copolymerized with the base polymer. Examples of polar monomers include (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, hydroxyethyl (meth)acrylate, (meth)acrylamide, and (meth)acrylic acid N, Monomers such as N-dimethylaminoethyl ester and glycidyl (meth)acrylate having carboxyl group, hydroxyl group, amide group, amine group, epoxy group and the like.

The adhesive composition may contain only the above-mentioned base polymer, but usually further contains a crosslinking agent. As a cross-linking agent, there can be exemplified: metal ions with a divalent or higher, which form a metal salt of carboxylic acid with a carboxyl group; polyamine compounds, which form an amide bond with a carboxyl group; polyepoxy compounds or polyols, which are The carboxyl group forms an ester bond; the polyisocyanate compound forms an amide bond with the carboxyl group. Among them, polyisocyanate compounds are preferred.

The active energy ray-curable adhesive composition refers to an adhesive composition that has the property of being hardened by irradiation with active energy rays such as ultraviolet rays or electron beams, and has properties even before the irradiation of active energy rays Adhesiveness can be tightly adhered to the film and other adherends, and can be hardened by the irradiation of active energy rays to adjust the nature of the adhesive force. The active energy ray-curable adhesive composition is preferably an ultraviolet-curable type. The active energy ray-curable adhesive composition contains an active energy ray polymerizable compound in addition to the base polymer and the crosslinking agent. Furthermore, if necessary, a photopolymerization initiator or a photosensitizer may be included.

The adhesive composition may include fine particles, beads (resin beads, glass beads, etc.) for imparting light scattering properties, glass fibers, resins other than the base polymer, adhesion imparting agents, and fillers (metal powder or Other inorganic powders, etc.), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, defoamers, corrosion inhibitors, photopolymerization initiators and other additives.

It can be formed by applying the organic solvent dilution liquid of the above-mentioned adhesive composition on a substrate and drying. In the case of using an active energy ray-curable adhesive composition, by irradiating the formed adhesive layer with active energy rays, a cured product having a desired degree of curing can be produced.

From the viewpoint of absorbing the step difference caused by the coloring layer 40, the thickness of the bonding layer 20 is preferably thicker than the thickness of the colored layer 40, for example, preferably 4 μm to 100 μm, more preferably 5 μm to 50 μm .

(Back panel) As long as the back plate 30 is a plate-shaped body that can transmit light, the material and thickness are not limited, and it may be a single layer or a plurality of layers. The thickness of the back plate is preferably 50 μm to 1000 μm. The back panel may not include the display unit described later.

As the back panel 30, constituent elements generally used in an image display device such as a polarizing plate and a touch sensor panel can be used. By using such constituent elements as the back panel 30, when the optical laminate 100 is used to construct an image display device, the number of constituent elements of the image display device can be reduced, and the image display device can be made thinner . The back plate 30 is not limited to the polarizing plate or the touch sensor panel described above, and may be a protective film on the viewing side of the polarizing plate, a polarizing plate, a laminate of the touch sensor panel, and the like.

As the back panel 30, similar to the front panel 10, a plate-shaped body made of glass (for example, glass plate, glass film, etc.), or a plate-shaped body made of resin (for example, resin plate, resin sheet, resin film, etc.) ). As specific examples of the plate-shaped body made of glass and the plate-shaped body made of resin, the above description on the front panel 10 applies.

(Manufacturing method of optical laminate) FIG. 3 is a cross-sectional view schematically showing the method for manufacturing the optical laminate of this embodiment. The manufacturing method of the optical layered body 100 includes the steps of preparing the back plate 30 (FIG. 3(a)), forming a color layer forming step of the color layer 40 on the surface of the back plate 30 (FIG. 3(b)), and forming The step of laminating the back layer 30 of the color layer 40, the bonding layer 20, and the front panel 10 to obtain the optical layered body 100 (FIG. 3(e)). The formation method of the colored layer 40 is as described above, and printing methods such as screen printing can be cited.

Before the lamination step (FIG. 3(e)), there may be a step of preparing the front panel 10 (FIG. 3(c)) and a step of providing a bonding layer 20 on the surface of the front panel 10 (FIG. 3(d)).

(Image display device) FIG. 4 is a schematic cross-sectional view schematically showing an example of an image display device provided with the optical laminate of this embodiment. 5(a) and (b) are schematic views showing an example of the curved state of the image display device. As shown in FIG. 5, the image display device 300 has an optical layered body 100 including a front panel 10 disposed on its front (viewing side), and a display layered body 200 including a display unit, and the display layered body 200 is layered on the optical layered body 100 on the 30 side of the back panel.

The image display device 300 may also be a flexible display panel. An image display device as a flexible display may be configured such that, as shown in FIG. 5(a), the side surface may be viewed as being folded inside, or may be configured as shown in FIG. 5(b) so as to be rollable.

The image display device 300 can be configured as a touch panel type image display device. The image display device of the touch panel method includes a touch sensor panel, and the front panel 10 included in the optical laminate 100 constitutes a touch surface.

Examples of the display unit included in the display laminate 200 include a display unit including a display element such as a liquid crystal display element, an organic EL display element, an inorganic EL display element, a plasma display element, and a field emission display element.

The image display device can be used as a mobile device such as a smart phone, tablet, etc., a TV, a digital photo frame, an electronic signage, a measuring instrument or a meter, office equipment, medical equipment, computer equipment, etc. The image display device of this embodiment has the optical layered body in which the colored layer has good shielding properties as described above, and the whiteness of the colored layer is suppressed, so it can have a good appearance.

A specific example of the image display device will be described based on FIGS. 6 to 9. 6 to 9 are schematic cross-sectional views schematically showing another example of the image display device provided with the optical laminate of this embodiment.

When the image display device is a touch panel type liquid crystal display device 301 as shown in FIG. 6, the liquid crystal display device 301 can be provided with a front panel 10, a bonding layer 20, a polarizing plate 60a, and a touch The sensor panel 70, the liquid crystal display element unit 81, the polarizing plate 60b, and the backlight unit 90 are controlled. The liquid crystal display device 301 may include a coloring layer 40 provided on a portion of the surface of the polarizing plate 60a in front of the panel 10 side. The liquid crystal display device 301 can be divided into a display area A and a non-display area B in the plane direction. In this case, it is preferable to provide the colored layer 40 in the non-display area B.

In the liquid crystal display device 301, a laminate including the front panel 10, the bonding layer 20, and the polarizing plate 60a and including the colored layer 40 is configured as an optical laminate 101, and the liquid crystal display device 301 is configured using the optical laminate 101. In this embodiment, the polarizing plate 60a also functions as the back plate 30 of the optical laminate 101.

As the liquid crystal display device of the touch panel method, the liquid crystal display device 302 shown in FIG. 7 may be replaced by the liquid crystal display device 301 shown in FIG. 6. The difference between the liquid crystal display device 302 and the liquid crystal display device 301 shown in FIG. 6 is only that the lamination position of the polarizing plate 60a and the touch sensor panel 70 is switched, and the colored layer 40 is provided on the front panel of the touch sensor panel 70 On the surface of 10 sides.

In the liquid crystal display device 302, the layered body including the front panel 10, the bonding layer 20, and the touch sensor panel 70 and provided with the colored layer 40 is configured as an optical layered body 102, and the liquid crystal display is constructed using the optical layered body 102装置302。 302. In this embodiment, the touch sensor panel 70 also functions as the back panel 30 of the optical laminate 102.

When the image display device is the organic EL display device 303 of the touch panel method as shown in FIG. 8, the organic EL display device 303 may include the front panel 10, the bonding layer 20, and the polarizing plate 60c in order from the viewing side , A touch sensor panel 70, and an organic EL unit 82. The organic EL display device 303 may include a coloring layer 40 provided on a part of the surface of the polarizing plate 60c in front of the panel 10 side. The organic EL display device 303 can be divided into a display area A and a non-display area B in the plane direction. In this case, it is preferable to provide the colored layer 40 in the non-display area B.

In the organic EL display device 303, the layered body including the front panel 10, the bonding layer 20, and the polarizing plate 60c and provided with the colored layer 40 is configured as an optical layered body 103, and the organic layered body 103 is used to configure the organic EL display device 303 . In this embodiment, the polarizing plate 60c also functions as the back plate 30 of the optical laminate 103.

As the organic EL display device of the touch panel method, the organic EL display device 304 shown in FIG. 9 may be substituted for the organic EL display device 303 shown in FIG. 8. The difference between the organic EL display device 304 and the organic EL display device 303 shown in FIG. 8 is only that the stacked positions of the polarizing plate 60c and the touch sensor panel 70 are switched, and the colored layer 40 is provided on the touch sensor panel 70 On the surface of the front panel 10 side.

In the organic EL display device 304, the layered body including the front panel 10, the bonding layer 20, and the touch sensor panel 70 and provided with the colored layer 40 is configured as an optical layered body 104, and the organic layered body 104 is used to form an organic layered body EL display device 304. In this embodiment, the touch sensor panel 70 also functions as the back plate 30 of the optical laminate 104.

(Polarizer) As the polarizing plate, a stretched film obtained by adsorbing an anisotropic absorption dye, or a film containing a film obtained by coating and curing an anisotropic absorption dye as a polarizing element, etc. may be mentioned. Examples of the dye having absorption anisotropy include dichroic dyes. As the dichroic dye, specifically, iodine or a dichroic organic dye can be used. The dichroic organic dyes include dichroic direct dyes containing diazo compounds such as C.I. DIRECT RED 39 and dichroic direct dyes containing compounds such as triazo and tetrazo. As a film used as a polarizing element coated with an anisotropic dye, a stretched film obtained by adsorbing an anisotropic dye can be cited, or a film containing a dichroic dye having liquid crystallinity can be applied. A film of a composition or a layer containing a dichroic dye and a polymerizable liquid crystal and hardened. The film obtained by coating and curing an anisotropic dye is harder to bend than the stretched film obtained by adsorbing an anisotropic dye, so it is preferable.

(1) Polarizing plate with stretch film as polarizing element A polarizing plate having a stretched film obtained by adsorbing an anisotropic dye as a polarizing element will be described. The stretched film obtained by adsorbing a dye having absorption anisotropy as a polarizing element usually undergoes a step of uniaxially stretching a polyvinyl alcohol-based resin film, and is dyed by using a dichroic dye to dye the polyvinyl alcohol-based resin film. The step of adsorbing the dichroic dye, the step of treating the polyvinyl alcohol-based resin film adsorbed with the dichroic dye with an aqueous solution of boric acid, and the step of washing with water after treatment with an aqueous solution of boric acid. The polarizing element can be used directly as a polarizing plate, or the polarizing plate can be obtained by laminating a transparent protective film on one side or both sides. The thickness of the polarizing element thus obtained is preferably 2 μm or more and 40 μm or less, and more preferably 3 μm or more and 15 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 other monomers copolymerizable therewith can be used. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having ammonium groups.

The saponification degree of the polyvinyl alcohol-based resin is usually about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, for example, polyvinyl acetal or polyvinyl acetal modified with aldehydes may be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably 1,500 to 5,000.

A film obtained by forming a film of such a polyvinyl alcohol-based resin is used as a raw film of a polarizing plate. The method of forming the polyvinyl alcohol-based resin is not particularly limited, and the film can be formed by a known method. The film thickness of the polyvinyl alcohol-based green film can be, for example, about 10 μm to 150 μm.

The uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before dyeing, simultaneous dyeing, or after dyeing with a dichroic pigment. In the case of uniaxial stretching after dyeing, the uniaxial stretching may be performed before boric acid treatment or may be performed in boric acid treatment. Moreover, uniaxial extension can also be performed in these plural stages. For uniaxial stretching, uniaxial stretching can be performed between rolls with different peripheral speeds, or hot rollers can also be used for uniaxial stretching. The uniaxial stretching may be dry stretching in the atmosphere, or wet stretching using a solvent in a state in which the polyvinyl alcohol-based resin film is swelled. The stretching magnification is usually about 3 to 8 times.

The material of the protective film attached to one side or both sides of the polarizing element is not particularly limited, and examples thereof include films known in the art: cyclic polyolefin-based resin films; such as triethyl cellulose and diethyl acetyl Cellulose acetate-based resin film of resins such as cellulose; polyester-based resins containing resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate Film; polycarbonate resin film; (meth)acrylic resin film; polypropylene resin film, etc. From the viewpoint of thinning, the thickness of the protective film is usually 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less, and usually 5 μm or more, preferably 20 μm or more. The protective film may or may not have a phase difference.

(2) Polarizing plate with a film formed of a liquid crystal layer as a polarizing element A polarizing plate including a film formed of a liquid crystal layer as a polarizing element will be described. As a film used as a polarizing element coated with an anisotropic dye, a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a liquid crystal compound can be cited. A film obtained by hardening the substrate. The film can be peeled off the substrate or used together with the substrate as a polarizing plate, or it can be used as a polarizing plate with a protective film on one or both sides. As this protective film, the same as the polarizing plate provided with the above-mentioned stretched film as a polarizing element is mentioned.

The film obtained by coating and curing an anisotropic pigment is preferably thin, but if it is too thin, the strength tends to decrease and the processability tends to be poor. 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.

Examples of the film obtained by coating an anisotropic dye include the films described in Japanese Patent Laid-Open No. 2013-37353 or Japanese Patent Laid-Open No. 2013-33249.

The polarizing plate may further include a phase difference film. The retardation film may include one or more retardation layers. As the phase difference layer, there may be an anode A plate such as a λ/4 plate or a λ/2 plate, and an anode C plate. The retardation layer may be formed of a resin film exemplified as the material of the protective film described above, or may be formed of a layer obtained by curing a polymerizable liquid crystal compound. The retardation film may further include an alignment film or a base film. The polarizing plate may be a circular polarizing plate.

(Touch sensor panel) As the touch sensor panel, as long as the sensor can detect the touched position, the detection method is not limited, and examples include a resistive film method, an electrostatic capacitance coupling method, a photo sensor method, an ultrasonic method, Touch sensor panel of electromagnetic induction coupling method, surface acoustic wave method, etc. From the viewpoint of low cost, a touch sensor panel of a resistive film method or an electrostatic capacitance coupling method can be preferably used.

An example of a resistive film-type touch sensor panel includes a pair of substrates arranged opposite to each other, an insulating spacer sandwiched between the pair of substrates, and a transparent front surface provided as a resistive film on the inner front surface of each substrate Conductive film and touch position sensing circuit. In an image display device provided with a touch sensor panel of a resistive film method, if the surface of the front panel 10 is touched, the opposing resistive film is short-circuited, and current flows in the resistive film. The touch position sensing circuit senses the change in voltage at this time to detect the touched position.

An example of a touch sensor panel of an electrostatic capacitance coupling method includes a substrate, a transparent electrode for position detection provided on the entire surface of the substrate, and a touch position sensing circuit. In an image display device provided with a touch sensor panel of an electrostatic capacitance coupling method, if the surface of the front panel 10 is touched, the transparent electrode is grounded through the electrostatic capacitance of the human body at the point of touch. The touch position sensing circuit senses the ground of the transparent electrode, thereby detecting the touched position. [Example]

Hereinafter, the present invention will be described in more detail with examples, but the present invention is not limited by these examples.

[Measurement of arithmetic average roughness] The surface opposite to the polarizing plate side of the second layer of the second layer of the TAC (triacetyl cellulose) surface formed on the polarizing plate, and the opposite side of the second layer side of the first layer formed on the second layer On the surface, arithmetic average roughness was measured using an interference microscope (manufactured by Bruker, Contour GT).

[Determination of Optical Density] Prepare samples of the "base material/coloring layer" layer structure obtained by forming a coloring layer on the substrate (the polarizing plate produced in Example 1) in the same order as in each of the Examples and Comparative Examples. The sample was cut into 5 cm×5 cm and used as a measurement sample for optical density measurement in each example and comparative example. Place the measurement sample in an optical density tester (product name: 361T, manufactured by X-rite Corporation), light the light source on the upper part of the colored layer side of the measured sample, make the focus on the colored layer of the measured sample, and extinguish the upper part After that, the light source for measurement located on the substrate side of the measurement sample is turned on, and the optical density is measured using the colored layer as the measurement area. The results are shown in Table 2.

[Measurement of the thickness of the colored layer and the layer forming the colored layer] The thickness of the colored layer and the layers forming the colored layer are measured using an electron microscope ("SU8010" manufactured by Hitachi High-Technologies Corporation).

[Visual Observation of Optical Laminate] A three-wavelength lamp is installed at a position about 200 mm from the polarizer side of the optical laminate, and the light from the three-wavelength lamp is incident on the optical laminate from the polarizer side, and borrowed from the window film side of the optical laminate with the adhesive layer Visually confirm the color of the colored layer and the state of transmission.

[Example 1] (Manufacture of window film with adhesive layer) Prepare a window film with a thickness of 70 μm on both sides of the base film (base film 50 μm, each hard coat 10 μm, length 270 mm × width 250 mm) as the front panel (Figure 3(c )), prepare a (meth)acrylic adhesive layer (thickness 25 μm, length 270 mm × width 250 mm) as a bonding layer. The base film of the window film is a polyimide-based resin film, and the hard coat layer is a layer formed of a composition containing a dendrimer compound having a polyfunctional acryl group at the terminal. Thereafter, corona treatment is applied to the bonding surface of the window film and the adhesive layer and the bonding surface of the adhesive layer and the window film. Then, the window film and the adhesive layer are bonded together to obtain a window film with an adhesive layer (FIG. 3(d)).

(Production of polarizer) After forming a photo-alignment film on a triacetyl cellulose (TAC) film with a thickness of 25 μm, a composition containing a dichroic dye and a polymerizable liquid crystal compound is applied to the substrate to align and harden it to obtain a thickness It is a 2.5 μm polarizer. An acrylic resin composition was coated on the polarizing element and cured to obtain a coating layer with a thickness of 1 μm. A phase difference film (thickness 16 μm, layer consisting of adhesive layer (thickness 5 μm)/layer containing hardened liquid crystal compound and alignment layer λ/4 plate (thickness 3 μm)/adhesive layer (thickness 5 μm)/anode C plate (thickness 3 μm) containing the layer and alignment film hardened by the liquid crystal compound). In this way, the produced polarizing plate ("TAC/polarizing element/retardation film" layer structure, thickness 44.5 μm, length 270 mm×width 250 mm) was obtained (FIG. 3(a)).

(Formation of colored layer) On the surface of the TAC of the polarizing plate obtained above, the following second layer forming composition (black) was used as the ink and a 460 mesh screen was used to dry by screen printing and the coating thickness was 6 μm. After printing for 30 minutes and drying, a second layer including a printed layer with a thickness of 6 μm, a length of 60 mm, and a width of 55 mm is formed on a part of the peripheral portion. Then, after drying on the surface of the second layer (the surface opposite to the TAC), using the following composition for forming a first layer as an ink and using a 460 mesh screen to dry by screen printing The coating thickness becomes a printing amount of 3 μm. On the second layer formed above, a first layer including a printing layer with a thickness of 3 μm, a length of 60 mm, and a width of 55 mm is formed, thereby forming a self-polarizing plate. The sequence has a coloring layer of layer 2 and layer 1. When the colored layer is formed, the arithmetic average roughness of each layer is measured. The results are shown in Table 2.

(Preparation of the composition for forming the first layer) To 100 parts by mass of the following ink component, 10 parts by mass of a hardener and 10 parts by mass of a solvent were added, and the mixture was stirred at ordinary temperature to obtain a composition for forming a first layer. The pigment concentration with respect to the ink component of the composition for forming the first layer is 0% by mass. [Ink composition] Ink composition (H) shown in Table 1 [hardener] Aliphatic polyisocyanate 75% by mass Ethyl acetate 25% by mass [Solvent] Isophorone

(Preparation of the composition for forming the second layer) With respect to 100 parts by mass of the following ink components, 10 parts by mass of a hardener and 10 parts by mass of a solvent were added, and the mixture was stirred at ordinary temperature to obtain a composition for forming a second layer. The pigment concentration of the composition for forming the second layer with respect to the ink component was 10% by mass. [Ink composition] Ink composition (B) shown in Table 1 [hardener] Aliphatic polyisocyanate 75% by mass Ethyl acetate 25% by mass [Solvent] Isophorone

(Fabrication of optical laminates) After that, corona treatment is applied to the surface of the adhesive layer of the window film with the adhesive layer and the surface of the coloring layer on which the polarizing plate is formed, and the surface of the adhesive layer The window film and the polarizing plate were laminated, laminated using a roll bonding machine, and cured in an autoclave to obtain the optical laminate of Example 1 (FIG. 3(e)). The optical laminate obtained was visually observed in the above-mentioned order, and as a result, it was black, and no objects such as a three-wavelength lamp located on the polarizing plate side could be seen without transmission.

[Examples 2 and 3] The optical laminates of Examples 2 and 3 were obtained in the same order as Example 1, except that the ink components shown in Table 1 and Table 2 were used. The obtained optical laminate was visually observed in the above-mentioned order, and the results were all black, and no objects such as a three-wavelength lamp located on the polarizing plate side could be seen without transmission.

[Example 4] Using the ink components shown in Tables 1 and 2 as the thickness of the coloring layer shown in Table 2, the optical laminate of Example 4 was obtained in the same order as Example 1 except for the thickness of the coloring layer shown in Table 2. The optical laminate obtained was visually observed in the above-mentioned order, and as a result, it was grayish black, and no objects such as three-wavelength lamps on the polarizing plate side could be seen without transmission.

[Example 5] The second layer was not provided, and the ink components shown in Table 1 were used on the surface of the TAC of the polarizing plate to form a colored layer. In the same order as in Example 1, the optical laminate of Example 4 was obtained. The optical laminate obtained was visually observed in the above-mentioned order, and as a result, it was grayish black, and no objects such as three-wavelength lamps on the polarizing plate side could be seen without transmission.

[Example 6] Using the ink components shown in Table 1 and Table 2 as the thickness of the coloring layer shown in Table 2, the optical laminate of Example 6 was obtained in the same order as Example 1 except for the thickness of the coloring layer shown in Table 2. The optical laminate obtained was visually observed in the above-mentioned order, and as a result, it was grayish black, and no objects such as three-wavelength lamps on the polarizing plate side could be seen without transmission.

[Comparative Examples 1 and 2] Using the ink components shown in Table 1 and Table 2 as the thickness of the coloring layer shown in Table 2, the optical laminate of Comparative Example 1 was obtained in the same order as Example 1 except for the thickness of the coloring layer shown in Table 2. The obtained optical layered body was visually observed in the above-mentioned order. Although the results were all grayish black, the three-wavelength lamp and the like located on the polarizing plate side were seen through through.

[Comparative Example 3] The ink composition shown in Table 1 and Table 2 was used as the thickness of the coloring layer shown in Table 2, and the optical laminate of Comparative Example 3 was obtained in the same order as in Example 1 except for the thickness of the coloring layer shown in Table 2. The obtained optical layered body was visually observed in the above-mentioned order. As a result, although three-wavelength lamps and the like located on the polarizing plate side were not seen without transmission, the color tone was gray.

[Table 1]

[Table 2]

10: Front panel 20: Laminated layer 30: back panel 40: Colored layer 40a: Level 1 40b: Layer 2 60a: polarizer 60b: polarizer 60c: polarizer 70: Touch sensor panel 81: Liquid crystal display element unit 82: Organic EL unit 90: backlight unit 100: optical laminate 101: Optical laminate 102: Optical laminate 103: Optical laminate 104: optical laminate 200: display laminate 300: Image display device 301: Liquid crystal display device 302: Liquid crystal display device 303: Organic EL display device 304: Organic EL display device A: Display area B: Non-display area

FIG. 1 is a schematic cross-sectional view schematically showing an example of the optical laminate of the present invention. FIG. 2 is a schematic plan view of the optical laminate shown in FIG. 1 viewed from the front panel side. 3(a) to (e) are cross-sectional views schematically showing the method for manufacturing the optical laminate of the present invention. 4 is a schematic cross-sectional view schematically showing an example of an image display device provided with the optical laminate of the present invention. 5(a) and (b) are schematic views showing an example of the curved state of the image display device. 6 is a schematic cross-sectional view schematically showing another example of the image display device provided with the optical laminate of the present invention. 7 is a schematic cross-sectional view schematically showing still another example of the image display device provided with the optical laminate of the present invention. 8 is a schematic cross-sectional view schematically showing still another example of the image display device provided with the optical laminate of the present invention. 9 is a schematic cross-sectional view schematically showing still another example of an image display device provided with the optical laminate of the present invention.

10: Front panel

20: Laminated layer

30: back panel

40: Colored layer

40a: Level 1

40b: Layer 2

100: optical laminate

A: Display area

B: Non-display area

Claims (12)

An optical laminate having a front panel, a bonding layer, and a back panel in sequence, and Having a coloring layer provided on a part of the surface of the front panel side of the back panel, The arithmetic average roughness Ra1 of the surface of the colored layer on the front panel side is 0.15 μm or less, The optical density of the colored layer is 5 or more. The optical layered body according to claim 1, wherein the arithmetic average roughness Ra1 is 0.1 μm or less. The optical laminate according to claim 1 or 2, wherein the colored layer includes a first layer disposed on the outermost surface of the front panel side, and a second layer disposed on the back panel side of the first layer. The optical laminate according to claim 3, wherein the arithmetic average roughness Ra2 of the surface of the second layer on the front panel side is larger than the arithmetic average roughness Ra1. The optical laminate according to claim 3 or 4, wherein the second layer contains a colorant, The colorant contains at least a pigment. The optical laminate according to claim 5, wherein the concentration of the pigment in the second layer is greater than the concentration of the pigment in the first layer. The optical laminate according to claim 6, wherein the thickness of the first layer is smaller than the thickness of the second layer. The optical laminate according to any one of claims 5 to 7, wherein the pigment is a black pigment. The optical laminate according to any one of claims 1 to 8, wherein the colored layer is provided on at least a part of a peripheral portion of the optical laminate. The optical laminate according to any one of claims 1 to 9, wherein the back plate includes at least one of a polarizing plate and a touch sensor panel. A method for manufacturing an optical laminate, which is a method for manufacturing an optical laminate as claimed in any one of claims 1 to 10, and It includes the step of forming the colored layer by screen printing on the back plate. The method for manufacturing an optical laminate according to claim 11, wherein the colored layer includes a first layer disposed on the outermost surface of the front panel side, and a second layer disposed on the back panel side of the first layer, The step of forming the colored layer includes a step of forming the second layer by screen printing on one side of the back plate, and a step of forming the first layer by screen printing on the opposite side of the back plate of the second layer Steps.

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