JP2021018321A - Optical laminate and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical laminate having a colored layer, in which air bubbles are suppressed and a step on the surface on the viewing side is suppressed. SOLUTION: A front plate, a bonding layer, and a back plate are provided in order from a visual side to a display side, and a colored layer provided on a part of the surface of the front plate on the display side and a display side of the back plate. An optical laminate further comprising a shielding layer provided on a part of the surface of the above, and the colored layer and the shielding layer overlap in at least a part region in a plane direction orthogonal to the lamination direction. [Selection diagram] Fig. 1

Description

The present invention relates to an optical laminate and a method for producing the same, and further relates to an image display device.

As various image display devices such as a liquid crystal display device and an organic electroluminescence display device, a configuration is known in which a front plate is provided on the visual side of the display panel for the purpose of protecting the display panel. When the display panel is a touch panel, the front plate can also function as a touch surface.

Japanese Unexamined Patent Publication No. 2014-238533 (Patent Document 1) describes that a front plate is provided on the visual side of the display panel of an image display device, and the peripheral edge of the surface of the front plate on the display panel side is colored. It is described that a print layer is provided as a layer.

Japanese Unexamined Patent Publication No. 2014-238533

Since the surface on which the colored layer is formed has a step corresponding to the height of the colored layer, the present inventors may generate bubbles when laminating with another layer to prepare an optical laminate. We have found that the surface of the optical laminate obtained may have a step on the visible surface.

An object of the present invention is to provide an optical laminate having a colored layer, an optical laminate in which air bubbles are suppressed and a step on the surface on the visual side is suppressed, and a method for manufacturing the optical laminate. To do. Another object of the present invention is to provide an image display device having the optical laminate.

The present invention provides an optical laminate, an image display device, and a method for manufacturing the optical laminate shown below.

[1] The front plate, the bonding layer, and the back plate are provided in order from the visual side to the display side.
A colored layer provided on a part of the surface of the front plate on the display side,
A shielding layer provided on a part of the surface of the back plate on the display side is further provided.
An optical laminate in which the colored layer and the shielding layer overlap in at least a part of a region in a plane direction orthogonal to the lamination direction.
[2] The optical laminate according to [1], wherein the shielding layer contains a black pigment.
[3] The optical laminate is divided into a display region and a non-display region in a plane direction orthogonal to the lamination direction.
The optical laminate according to [1] or [2], wherein the non-display region has an optical density of 3 or more.
[4] The optical laminate according to [3], wherein the shielding layer is provided in the non-display region.
[5] The optical laminate according to any one of [1] to [4], wherein the front plate is a resin film.
[6] The optical laminate according to any one of [1] to [5], wherein the back plate has a polarizing plate.
[7] An image display device comprising the optical laminate according to any one of [1] to [6], wherein the front plate is arranged on the front surface.
[8] A manufacturing method for manufacturing the optical laminate according to any one of [1] to [6].
A step of forming the colored layer on a part of the surface of the front plate on the display side to obtain a front plate with a colored layer.
A step of forming the shielding layer on a part of the surface of the back plate on the display side to obtain a back plate with a shielding layer.
A manufacturing method comprising a step of laminating the front plate with a colored layer, the bonding layer, and the back plate with a shielding layer to obtain the optical laminate.
[9] A manufacturing method for manufacturing the optical laminate according to claim 1.
A step of forming the colored layer on a part of the surface of the front plate on the display side to obtain a front plate with a colored layer.
A step of laminating the front plate with a colored layer, the bonding layer, and the back plate to obtain an optical laminate precursor.
A manufacturing method comprising a step of forming the shielding layer on a part of the display-side surface of the back plate of the optical laminate precursor.

According to the present invention, an optical laminate having a colored layer, an optical laminate in which air bubbles are suppressed and a step on the surface on the viewing side is suppressed, an image display device having the optical laminate, and the optical laminate. A method of manufacturing a body can be provided.

It is the schematic sectional drawing of the optical laminated body by one Embodiment of this invention. It is the schematic sectional drawing of the image display apparatus according to one Embodiment of this invention. It is a top view of the optical laminate viewed from the front plate side. It is the schematic sectional drawing of the optical laminated body by another embodiment of this invention. It is a figure which shows the example of the bending mode when the image display device is a flexible display. It is the schematic sectional drawing of the image display apparatus according to 1st Embodiment of this invention. It is the schematic sectional drawing of the image display apparatus according to 2nd Embodiment of this invention. It is the schematic sectional drawing of the image display apparatus according to 3rd Embodiment of this invention. It is the schematic sectional drawing of the image display apparatus according to 4th Embodiment of this invention. It is sectional drawing which shows typically an example of the manufacturing method of the optical laminated body of this invention. It is sectional drawing which shows typically another example of the manufacturing method of the optical laminate of this invention.

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.

[Optical laminate]
FIG. 1 is a schematic cross-sectional view of an optical laminate according to one embodiment of the present invention. The optical laminate 100 of the present embodiment includes a front plate 10, a bonding layer (first bonding layer) 20, and a back plate 30 in this order from the viewing side to the display side. The optical laminate 100 includes a colored layer 40 and a shielding layer 50 separately from the colored layer 40. The colored layer 40 is provided on a part of the surface of the front plate 10 on the display side. The shielding layer 50 is provided on a part of the surface of the back plate 30 on the display side. In the optical laminate 100 of the present embodiment, at least the bonding layer 20 and the back plate 30 are provided between the colored layer 40 and the shielding layer 50, so that the optical laminate 100 is on the surface of the optical laminate 100 on the visible side. It is possible to suppress the step difference.

The colored layer 40 and the shielding layer 50 overlap in at least a part of the plane direction orthogonal to the stacking direction. FIG. 1 shows a form in which the colored layer 40 and the shielding layer 50 overlap in the entire region in the plane direction orthogonal to the stacking direction.

The optical laminate 100 may be one in which optical plates (not shown in FIG. 1) are further laminated. Examples of such an optical plate include a front optical plate laminated at a position between the back plate 30 and the front plate 10, and a rear optical plate laminated at a position opposite to the front plate 10 side with respect to the back plate 30. Be done. The optical laminate 100 may be divided into a display region A and a non-display region B in the plane direction orthogonal to the stacking direction, and the region where the shielding layer 50 is provided is usually the non-display region B. .. For example, a region having an optical density of 3 or more can be designated as a non-display region B, and a region having an optical density of less than 3 can be designated as a display region A. The non-display region B preferably has an optical density of 3 or more, and more preferably 3.2 or more. When the optical density of the non-display area B is within the above numerical range, elements such as wiring arranged in the non-display area B are sufficiently shielded, and the visibility of the image in the display area A is improved.

[Image display device]
FIG. 2 is a schematic cross-sectional view of an image display device according to an embodiment of the present invention. The image display device 300 of the present embodiment has a second bonding that is interposed between the optical laminate 100 arranged on the front surface, the display laminate 200 including the display unit, and the optical laminate 100 and the display laminate 200. It has a layer 21 and. The optical laminate 100 has the same configuration as the optical laminate 100 shown in FIG.

FIG. 3 is a top view of the image display device 300 as viewed from the front plate 10 side. The shape and color of the colored layer 40 are visually recognized via the front plate 10, which affects the design of the image display device 300. In the present embodiment, the surface of the colored layer 40 on the visible side is smooth because it is in contact with the surface of the front plate 10, and therefore contributes to the improvement of design. As long as the colored layer 40 is formed at a position overlapping the shielding layer 50 in at least a part of the area in the plane direction orthogonal to the stacking direction, the arrangement position in the plane direction is not limited. By arranging the colored layer 40 on the peripheral edge portion as in the image display device 300 shown in FIGS. 3 and 4, light leakage can be suppressed and the design is improved because it is visually recognized as a frame. be able to. The colored layer 40 can also contribute to the improvement of the optical density of the non-display region B.

The shielding layer 50 is preferably provided in the non-display region B, and contributes to the improvement of the optical density in the non-display region B.

In the present embodiment, the optical density of the non-display region B can be adjusted mainly by the shielding layer 50 and further adjusted by the colored layer 40. Therefore, it is preferable to adjust the thickness of the colored layer 40 so that bubbles are not generated at the interface during lamination, and adjust the thickness of the shielding layer 50 so that the optical density of the non-display region B becomes a desired value. The thickness of the shielding layer 50 is also preferably adjusted so that air bubbles are not generated at the interface during lamination, but the shielding layer 50 is generated in the vicinity thereof because it is farther from the viewing side than the colored layer 40. Bubbles are hard to see. Further, by adjusting the width of the colored layer 40 (particularly, the position of the end face on the display region side), it is possible to prevent the bubbles generated in the vicinity of the shielding layer 50 from being visually recognized. In the shielding layer 50, the optical density of the non-display region B can be adjusted by the blending amount of the black pigment in addition to the thickness.

The thickness of the shielding layer 50 is preferably 1 μm or more and 13 μm or less, and more preferably 2 μm or more and 10 μm or less.

The thickness of the colored layer 40 is preferably 13 μm or less, more preferably 10 μm or less, and even more preferably 8 μm or less. When the thickness of the colored layer 40 is within the above numerical range, bubbles generated at the interface during lamination can be suppressed, and steps generated on the visible side surface of the optical laminate after lamination can be suppressed. The thickness of the colored layer 40 is preferably 1 μm or more, and more preferably 2 μm or more. When the thickness of the colored layer 40 is 1 μm or more, the colored layer 40 is easily visible and contributes to the improvement of design, and also contributes to the improvement of the optical density of the non-display region B.

The total thickness of the colored layer 40 and the shielding layer 50 is preferably 20 μm or less, more preferably 15 μm or less, and even more preferably 12 μm or less. When it is within the above numerical range, it is possible to suppress the appearance of a step on the surface of the optical laminate on the visual side.

1 and 2 illustrate a case where the colored layer 40 and the shielding layer 50 have a uniform thickness and a rectangular cross-sectional shape, but the colored layer 40 and the shielding layer 50 may not have uniform thicknesses. Often, for example, the end face on the display region side may have a cross-sectional shape having a tapered portion whose thickness decreases inward. The angle of the tapered portion is, for example, 15 ° to 85 °. By having the tapered portion, it is possible to suppress the entrainment of air that tends to occur during stacking. When the thicknesses of the colored layer 40 and the shielding layer 50 are not uniform, the numerical range described above as the thickness of the colored layer 40 and the shielding layer 50 is the maximum thickness of the colored layer 40 and the shielding layer 50.

1 and 2 show an embodiment in which the colored layer 40 and the shielding layer 50 have the same width, but the colored layer 40 and the shielding layer 50 may overlap in a part of the region. FIG. 4 is a schematic cross-sectional view showing the optical laminate 100'of another embodiment in which the size relationship between the width of the colored layer 40 and the width of the shielding layer 50 is different from the optical laminate 100 shown in FIG. In the optical laminate 100', the width of the colored layer 40 is wider inward than the width of the shielding layer 50, and the inner end surface 40a of the colored layer 40 has a tapered portion that becomes thinner inward.

In the optical laminate 100', since the width of the colored layer 40 is wider inward than the width of the shielding layer 50, it is difficult to see the inner end surface 50a of the shielding layer 50, and bubbles are generated in the vicinity of the end surface 50a of the shielding layer 50. Even when mixed, deterioration of the appearance can be suppressed.

The shape and size of the optical laminates 100 and 100'in the plane direction correspond to the shape and size of the image display device 300 in which the optical laminate is used. The shape of the image display device 300 in the plane direction is preferably a square shape, and more preferably a square shape having a long side and a short side. This square shape is preferably rectangular. When the shape of the image display device 300 in the surface direction is rectangular, the length of the long side is, for example, 50 mm to 300 mm, preferably 100 mm to 280 mm. The length of the short side is, for example, 30 mm to 250 mm, preferably 60 mm to 220 mm. When the optical laminate 100 has a square shape, at least one kind of processing including R processing, notch processing, and drilling processing may be performed.

The thickness of the optical laminates 100, 100'is preferably appropriately designed according to the functions provided by the front plate 10 and the back plate 30, and is not particularly limited, but is, for example, 40 μm to 300 μm, preferably 70 μm to 200 μm. is there.

The image display device 300 can be configured as a flexible display panel. 5 (a) and 5 (b) show an example of a bending mode when the image display device is a flexible display panel. FIG. 5A is a flexible display 305 configured to be foldable with the viewing side surface inside, and FIG. 5B is a rollable flexible display 306.

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

Hereinafter, each component of the image display device according to the present invention will be described in detail by showing a specific form.

<First Embodiment>
FIG. 6 is a schematic cross-sectional view of the image display device according to the first embodiment of the present invention. The image display device of this embodiment is a touch panel type liquid crystal display device. The liquid crystal display device 301 includes a front plate 10, a first bonding layer 20, a polarizing plate 60a, a second bonding layer 21, a touch sensor panel 70, a liquid crystal display element unit 81, a polarizing plate 60b, and a back in order from the visual side. A light unit 90 is provided. The colored layer 40 is provided on a part of the surface of the front plate 10 on the display side. The shielding layer 50 is provided on a part of the surface of the polarizing plate 60a on the display side. The liquid crystal display device 301 may be divided into a display area A and a non-display area B in the surface direction. In this case, the non-display area B is usually provided with a shielding layer 50.

In the liquid crystal display device 301, a laminate composed of a front plate 10, a first bonding layer 20, and a polarizing plate 60a and having a coloring layer 40 and a shielding layer 50 is configured as an optical laminate 101, and such optical is used. The liquid crystal display device 301 is configured by using the laminated body 101. In the present embodiment, the polarizing plate 60a also functions as the back plate 30 of the optical laminate 101.

<Second Embodiment>
FIG. 7 is a schematic cross-sectional view of the image display device according to the second embodiment of the present invention. The image display device of this embodiment is a touch panel type liquid crystal display device. The liquid crystal display device 302 has the polarizing plate 60a and the touch sensor panel 70 interchanged with the liquid crystal display device 301 shown in FIG. 6, and the colored layer 40 is a part of the front surface of the front plate 10 on the display side. The only difference is that the shielding layer 50 is provided on the surface of the touch panel sensor 70 on the display side.

In the liquid crystal display device 302, a laminate composed of a front plate 10, a first bonding layer 20, and a touch sensor panel 70, and having a colored layer 40 and a shielding layer 50 is configured as an optical laminate 102. The liquid crystal display device 302 is configured by using the optical laminate 102. In the present embodiment, the touch sensor panel 70 also functions as the back plate 30 of the optical laminate 102.

<Third Embodiment>
FIG. 8 is a schematic cross-sectional view of the image display device according to the third embodiment of the present invention. The image display device of the present embodiment is a touch panel type organic electroluminescence (EL) display device. The organic EL display device 303 includes a front plate 10, a first bonding layer 20, a polarizing plate 60c, a second bonding layer 21, a touch sensor panel 70, and an organic EL unit 82 in this order from the visual side. The organic EL display device 303 includes a colored layer 40 provided on a part of the surface of the front plate 10 on the display side and a shielding layer 50 provided on a part of the surface of the polarizing plate 60c on the display side. To be equipped. The organic EL display device 303 may be divided into a display area A and a non-display area B in the surface direction. In this case, the non-display area B is usually provided with a shielding layer 50.

In the organic EL display device 303, a laminate composed of a front plate 10, a first bonding layer 20, and a polarizing plate 60c and having a coloring layer 40 and a shielding layer 50 is configured as an optical laminate 103, which is the same. The organic EL display device 303 is configured by using the optical laminate 103. In the present embodiment, the polarizing plate 60c also functions as the back plate 30 of the optical laminate 103.

<Fourth Embodiment>
FIG. 9 is a schematic cross-sectional view of the image display device according to the fourth embodiment of the present invention. The image display device of this embodiment is a touch panel type organic EL display device. The organic EL display device 304 has the polarizing plate 60c and the touch sensor panel 70 interchanged with the organic EL display device 303 shown in FIG. 8, and the colored layer 40 is placed on the surface of the front plate 10 on the display side. The only difference is that the shielding layer 50 is provided on the surface of the touch panel sensor 70 on the display side.

In the organic EL display device 304, a laminate composed of a front plate 10, a first bonding layer 20, and a touch sensor panel 70, and having a coloring layer 40 and a shielding layer 50 is configured as an optical laminate 104. The organic EL display device 304 is configured by using the optical laminate 104. In the present embodiment, the touch sensor panel 70 also functions as the back plate 30 of the optical laminate 104.

(Display unit)
Examples of the display unit included in the image display device 300 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 an electric field radiation type display element.

The image display device 300 can be used as a flexible display. In this case, the display element is preferably a liquid crystal display element, an organic EL display element, or an inorganic EL display element because it can be made flexible.

(Front plate)
The material and thickness of the front plate 10 are not limited as long as it is a plate-like body capable of transmitting light, and the front plate 10 may be a single layer or a multi-layer, and is a glass plate-like body. Examples thereof include (for example, a glass plate, a glass film, etc.) and a resin plate-like body (for example, a resin plate, a resin sheet, a resin film, etc.). The front plate 10 can form the outermost surface of the image display device.

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

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, polyacrylic, polyimide, polyethersulfone, polysulfone. , Polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyetherketone, polyetheretherketone, polyethersulfone, polymethylmethacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene na Examples thereof include films formed of polymers such as phthalate, polycarbonate, and polyamideimide. These polymers can be used alone or in combination of two or more. When the image display device 300 is a flexible display, it is 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. Resin film is preferably used.

The resin film may be a film in which a hard coat layer is provided on at least one surface of the base film to further improve the hardness. 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 300 is a touch panel type image display device, the surface of the front plate 10 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 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 examples thereof include inorganic fine particles, organic fine particles, and mixtures thereof. The thickness of the resin film is, for example, 30 μm to 2000 μm.

The front plate 10 not only has a function of protecting the front surface of the image display device 300, but may also have a function as a touch sensor, a blue light cut function, a viewing angle adjusting function, and the like.

(1st bonding layer)
The first bonding layer 20 is a layer interposed between the front plate 10 and the back plate 30, and is an adhesive layer or an adhesive layer. The first bonding layer 20 is preferably an adhesive layer from the viewpoint of being able to satisfactorily absorb the steps of the colored layer 40.

The pressure-sensitive adhesive layer can be composed of a pressure-sensitive adhesive composition containing a resin such as (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether as a main component. 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, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, pressure-sensitive adhesives, fillers (metal powder 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 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 can be irradiated with active energy rays to obtain a cured product having a desired degree of curing.

The thickness of the first bonding layer 20 is preferably thicker than the thickness of the colored layer 40 from the viewpoint of absorbing the step of the colored layer 40, for example, preferably 3 μm to 100 μm, and more preferably 5 μm to 50 μm. preferable.

(Back plate)
The material and thickness of the back plate 30 are not limited as long as it is a plate-like body capable of transmitting light, and the back plate 30 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 plate may not include the display unit.

As the back plate 30, as described above, components used in a normal image display device such as polarizing plates 60a and 60c, a touch sensor panel 70, and the like can be used. By using such a component as the back plate 30, the number of components of the image display device 300 can be reduced, and the image display device 300 can be made thinner, which is preferable.

In the above, the case where the back plate 30 is also the polarizing plates 60a and 60c and the touch sensor panel 70 has been illustrated, but the back plate 30 is not limited to these, and is a protective film on the visual side of the polarizing plate. Alternatively, it may be a laminate of a polarizing plate and a touch sensor panel.

As the back plate 30, similarly to the front plate 10, a glass plate-like body (for example, a glass plate, a glass film, etc.) and a resin plate-like body (for example, a resin plate, a resin sheet, a resin film, etc.) are used. It can also be used. As specific examples of the glass plate-shaped body and the resin plate-shaped body, the above description regarding the front plate 10 is applied.

(Colored layer)
The shape and color of the colored layer 40 are not limited, and can be appropriately selected depending on the application and design of the image display device. The colored layer 40 contains a colorant. The colored layer 40 may be formed from a single layer or may be formed from a plurality of layers. When the coloring layer 40 is formed from a plurality of layers, at least one of the plurality of layers is a colorant-containing layer containing a colorant, and the remaining layer is colored even if the colorant is contained. It does not have to contain an agent. Examples of the color of the colorant include black, red, white, dark blue, silver, and gold. The colored layer 40 may have a colorant-containing layer having a high light-shielding property, a base layer for improving adhesion, or the like under the colorant-containing layer containing the colorant. Further, it may have a transparent protective layer that covers the colorant-containing layer.

The colorant can be appropriately selected depending on the desired color. Examples of colorants include carbon blacks such as titanium dioxide, zinc flower, and acetylene black, iron blacks, petals, chrome vermilions, ultramarine, cobalt blue, chrome yellow, and inorganic pigments such as titanium yellow; phthalocyanine blue and induslen. Organic pigments or dyes such as blue, isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, aniline black; metal pigments consisting of scaly foil pieces such as aluminum and brass; titanium dioxide-coated mica, basic lead carbonate A pearl bright pigment (pearl pigment) composed of scaly foil pieces such as the above can be mentioned. In the present specification, the metal contained in the plating layer is also included in the colorant.

Each layer of the colored layer 40 can be formed by a method such as a printing method, a coating method, or a plating method. The colored layer 40 may be formed directly on the surface of the back plate 30, or may be formed by transferring what is formed on another substrate onto the surface. Specific examples of the printing method include gravure printing, offset printing, screen printing, and transfer printing from a transfer sheet. Printing by the printing method may be repeated to obtain a colored layer 40 having a desired thickness. Examples of the ink used in the printing method include inks containing a colorant, a binder, a solvent, an arbitrary additive, 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, vinyl chloride-vinyl acetate copolymers, and cellulose resins. .. The binder resin may be used alone or in combination of two or more. The binder resin may be a thermosetting resin or a photopolymerizable resin.

When the colorant-containing layer is formed by the printing method, it is preferable to use an ink containing 50 to 200 parts by mass of the colorant with respect to 100 parts by mass of the binder resin.

Specific examples of the plating method include known plating methods such as electrolytic plating, electroless plating, hot-dip plating, chemical vapor deposition, and physical vapor deposition. Examples of the physical vapor deposition include an evaporation system including a method of heating and evaporating an evaporation source such as vacuum vapor deposition, molecular beam vapor deposition, and ion beam deposition, and a sputtering system such as magnetron sputtering and ion beam sputtering. These methods can be combined with patterning as needed. In the present specification, the layer formed by the plating method is referred to as a plating layer.

When the colored layer 40 is provided on the peripheral edge of the back plate 30, it is not limited to the form provided on the entire circumference of the peripheral edge, and is provided only on a part of the peripheral edge according to a desired design or the like. May be good. When the colored layer 40 is provided on the peripheral edge of the back plate 30, the width thereof can be appropriately determined according to the size of the display area, a desired design, and the like, and is preferably in the range of 1 mm to 20 mm, for example. ..

(Polarizer)
Examples of the polarizing plate include a stretched film on which a dye having absorption anisotropy is adsorbed, a film containing a film coated with a dye having absorption anisotropy and cured, and the like as a polarizer. Examples of the dye having absorption anisotropy include a dichroic dye. Specifically, as the dichroic dye, iodine or a dichroic organic dye is used. The dichroic organic dyes include dichroic direct dyes composed of disuazo compounds such as CI DIRECT RED 39 and dichroic direct dyes composed of compounds such as trisazo and tetrakisazo. As the film coated with the dye having absorption anisotropy used as a polarizer, a stretched film having the dye having absorption anisotropy adsorbed, a composition containing a dichroic dye having liquid crystallinity, or two. Examples thereof include a film having a layer obtained by applying and curing a composition containing a color dye and a polymerizable liquid crystal. A film coated with a dye having absorption anisotropy and cured is preferable because there is no limitation in the bending direction as compared with a stretched film having a dye having absorption anisotropy adsorbed.

(1) Polarizing Plate with Stretched Film as a Polarizer A polarizing plate having a stretched film having a dye having absorption anisotropy adsorbed as a polarizer will be described. A stretched film on which a dye having absorption anisotropy, which is a polarizer, is adsorbed is usually obtained by uniaxially stretching a polyvinyl alcohol-based resin film or dyeing the polyvinyl alcohol-based resin film with a bicolor dye. It is produced through a step of adsorbing a bicolor dye, a step of treating a polyvinyl alcohol-based resin film on which the 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 polarizing plate, or a polarizing plate having a transparent protective film bonded to one side or both sides thereof may be used as a polarizing plate. The thickness of the polarizer thus obtained is preferably 2 μm to 40 μm.

The polyvinyl alcohol-based resin is obtained by saponifying a 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 acrylamides having an ammonium group.

The degree of saponification 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, 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 about 1,000 to 10,000, preferably in the range of 1,500 to 5,000.

A film formed of such a polyvinyl alcohol-based resin is used as a raw film for a polarizing plate. The method for forming the film of 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 raw 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 with a dichroic dye, at the same time as dyeing, or after dyeing. When the uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before the boric acid treatment or during the boric acid treatment. It is also possible to perform uniaxial stretching at these multiple stages. In uniaxial stretching, rolls having different peripheral speeds may be uniaxially stretched, or thermal rolls may be used to uniaxially stretch. Further, the uniaxial stretching may be a dry stretching in which the stretching is performed in the atmosphere, or a wet stretching in which the polyvinyl alcohol-based resin film is swollen using a solvent. The draw ratio is usually about 3 to 8 times.

The material of the protective film to be bonded to one side or both sides of the polarizer is not particularly limited, but is, for example, a cellulose acetate-based resin made of a resin such as a cyclic polyolefin-based resin film, triacetyl cellulose, or diacetyl cellulose. Films known in the art such as resin films, polyester resin films made of resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polycarbonate resin films, (meth) acrylic resin films, and polypropylene resin films. Can be mentioned. 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 from a Liquid Crystal Layer as a Polarizer A polarizing plate having a film formed from a liquid crystal layer as a polarizer will be described. As a film coated with a dye having absorption anisotropy used as a polarizer, a composition containing a dichroic dye having liquid crystal properties or a composition containing a dichroic dye and a liquid crystal compound is used as a base material. Examples thereof include a film obtained by applying and curing. The film may be used as a polarizing plate by peeling off the base material or together with the base material, or may be used as a polarizing plate in a configuration having a protective film on one side or both sides thereof. Examples of the protective film include the same polarizing plate having the above-mentioned stretched film as a polarizer.

The film obtained by applying and curing a dye having absorption anisotropy is preferably 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 obtained by applying the dye having absorption anisotropy include the films described in JP2013-37353A, JP2013-33249, and the like.

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

(Touch sensor panel)
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. Examples of touch sensor panels include a method and a surface acoustic wave method. 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 to face 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 10 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 the 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 10 is touched, the transparent electrode is grounded via the capacitance of the human body at the touched point. The touch position detection circuit detects the grounding of the transparent electrode, and the touched position is detected.

The touch sensor panel can be formed, for example, on the base material layer via a separation layer by the resistance film type or the capacitance coupling type described above, and is separated between the base material layer and the separation layer. The separation layer can be exposed on the outermost surface.

(Shielding layer)
The width of the shielding layer 50 in the surface direction is not particularly limited, but is preferably the same as or narrower than the width of the colored layer 40 in the surface direction, and the end surface on the display area side is on the display area side of the colored layer 40. It is more preferable that it does not protrude from the end face. The shielding layer 50 preferably contains a colorant. The colorant preferably contains a colorant having a high optical density improving function, and preferably contains, for example, a black pigment such as carbon black or iron black. The shielding layer 50 may be formed of a single layer or may be formed of a plurality of layers.

The shielding layer 50 can be formed by a method such as a printing method or a coating method. The shielding layer 50 may be formed directly on the surface of the back plate 30 on the display side, or may be formed by transferring what is formed on another base material onto the surface of the back plate 30. As for the printing method, the above description regarding the colored layer 40 is applied.

(2nd bonded layer)
The second bonding layer 21 is an adhesive layer or an adhesive layer. When the second bonding layer 21 is provided at a position where it comes into contact with the colored layer 40 or the shielding layer 50, it is preferably an adhesive layer from the viewpoint of being able to satisfactorily absorb these steps. As the material of the second bonded layer 21, the above description of the first bonded layer 20 is applied.

[Manufacturing method of optical laminate]
10 (a) and 10 (b) are cross-sectional views schematically showing an embodiment of a method for manufacturing an optical laminate 100 according to the present invention. In the manufacturing method of the present embodiment, as shown in FIG. 10A, a step of forming a colored layer 40 on a part of the surface of the front plate 10 on the display side to obtain a front plate 10'with a colored layer is used. The present invention includes a step of forming a shielding layer 50 on a part of the surface of the back plate 30 on the display side to obtain a back plate 30'with a shielding layer. After that, as shown in FIG. 10B, the surface on the display side of the front plate 10'with the colored layer and the surface on the visible side of the back plate 30'with the shielding layer are opposed to each other via the bonding layer 20. The optical laminate 100 is manufactured through a step of laminating the front plate 10'with a colored layer and the back plate 30'with a shielding layer. The bonding layer 20 may be bonded to the surface of the front plate 10'with a colored layer on the display side first, or may be bonded to the surface of the back plate 30'with a shielding layer on the visible side first. .. According to the manufacturing method of the present embodiment, the generation of air bubbles in the bonded layer 20 can be suppressed.

In the above-mentioned manufacturing method, alignment marks are provided on the colored layer 40 and the shielding layer 50, and the front plate 10'with the colored layer and the shielding layer are attached so as to obtain the desired positional relationship while detecting the distance between the alignment marks. It is preferable to laminate with the back plate 30'. Positional accuracy can be improved by laminating in this way.

11 (a), 11 (b), and 11 (c) are cross-sectional views schematically showing another embodiment of the method for manufacturing the optical laminate 100 according to the present invention. In the manufacturing method of the present embodiment, first, as shown in FIG. 11A, a step of forming a colored layer 40 on a part of the surface of the front plate 10 on the display side to obtain a front plate 10'with a colored layer. I do. Next, as shown in FIG. 11B, the surface of the front plate 10'with the coloring layer on the display side and the surface of the back plate 30 on the visual side are opposed to each other via the bonding layer 20, and the coloring layer is formed. The step of obtaining the optical laminate precursor 100a is performed through the step of laminating the attached front plate 10'and the back plate 30. The bonding layer 20 may be bonded to the surface of the front plate 10'with a colored layer on the display side first, or may be bonded to the surface of the back plate 30 on the viewing side first. Finally, as shown in FIG. 11C, a step of forming a shielding layer 50 on a part of the surface of the back plate 30 of the optical laminate precursor 100a on the display side is performed to manufacture the optical laminate 100. According to the manufacturing method of the present embodiment, the generation of air bubbles in the bonded layer 20 can be suppressed.

The manufacturing method shown in FIG. 10 or FIG. 11 may be a method of manufacturing a large-sized optical laminate and then cutting and separating to produce a single-wafer-shaped optical laminate, or the sheet is cut and the end faces are aligned. It may be a method of producing a leaf-shaped optical laminate. In this case, the cut surface is selected so that the colored layer 40 and the shielding layer 50 are exposed on the cut surface. According to these methods, even if bubbles are generated in the vicinity of the end faces of the colored layer 40 and the shielding layer on the side other than the display region side at the time of lamination, the bubble-mixed portion can be cut and removed.

[Use of image display device]
The image display device according to the present invention can be used as a mobile device such as a smartphone or 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. According to the present invention, it is possible to suppress the generation of air bubbles in the first bonded layer 20, which is easily visible, and it is possible to suppress the step on the visible side surface of the front plate 10, so that there is a defect in appearance. It is possible to provide a high-quality image display device in which the occurrence of is suppressed.

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

<Preparation of composition for forming a colorant-containing layer (black)>
[Ink component]
Acetylene black 15% by mass
75% by mass of polyester
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 [Preparation 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 colorant-containing layer forming composition (black).

<Preparation of composition for forming a colorant-containing layer (white)>
[Ink component]
Titanium dioxide 50% by mass
39% by mass of polyester
Glutaric acid dimethyl ester 2.5% by mass
Succinic acid 2% by mass
Isophorone 6.5% by mass
[Hardener]
Aliphatic polyisocyanate 75% by mass
Ethyl acetate 25% by mass
[solvent]
Isophorone [Preparation 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 colorant-containing layer forming composition (white).

<Preparation of composition for forming protective layer (transparent)>
[Ink component]
90% by mass of polyester
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 [Preparation 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 composition for forming a protective layer.

<Example 1>
(Preparation of front plate)
As the front plate 10, a window film having a thickness of 70 μm (base film 50 μm, each hard coat layer 10 μm, length 177 mm × width 105 mm) having hard coat layers formed on both sides of the base film was prepared. The base film of the window film is a polyimide resin film, and the hard coat layer is a layer formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the end.

(Preparation of back plate)
A circular polarizing plate was prepared as the back plate 30. Specifically, the alignment film composition was applied to one side of a TAC film (manufactured by Konica Minolta Co., Ltd.) having a thickness of 25 μm, dried and irradiated with polarized UV to form a photoalignment film. A composition containing a dichroic dye and a polymerizable liquid crystal compound is applied onto the photoalignment film, dried, and then the polymerizable liquid crystal compound is cured by irradiation with ultraviolet rays to form a polarizer (thickness 2.5 μm). Formed. A protective layer composition containing polyvinyl alcohol and water was applied and dried on the surface of the polarizer opposite to the TAC film side to form a protective layer (thickness 1 μm). In this way, a linear polarizing plate was obtained.

A circular polarizing plate was obtained by laminating the λ / 4 layer side of the retardation film, which will be described later, on the protective layer of the linearly polarizing plate. The retardation film has a thickness of 15 μm and has a structure in which an adhesive layer, a λ / 4 layer, an adhesive layer, and a positive C layer are laminated in this order. Each of the pressure-sensitive adhesive layers had a thickness of 5 μm. The λ / 4 layer had a layer in which the liquid crystal compound was cured and an alignment film, and had a thickness of 2 μm. The positive C layer had a layer in which the liquid crystal compound was cured and an alignment film, and had a thickness of 3 μm. In this way, a circular polarizing plate (length 177 mm × width 105 mm) having a layer structure of “TAC film / photoalignment film / polarizer / protective layer / retardation film” was prepared.

(Preparation of bonding layer)
A (meth) acrylic pressure-sensitive adhesive layer (thickness 25 μm, length 177 mm × width 105 mm) was prepared as the first bonding layer 20.

(Formation of colored layer and shielding layer)
Next, on the surface of the front plate 10 on the display side, the colorant-containing layer forming composition (black) prepared above was used as an ink and screen-printed using a 460 mesh screen to obtain a coating thickness after drying. Printing with a discharge amount of 3 μm was performed to form a colored layer 40 composed of a black printing layer having a thickness of 3 μm and a width of 5 mm on the entire circumference of the peripheral edge portion, and a front plate 10'with a colored layer was obtained (FIG. 10). (A)). Further, a shielding layer 50 made of a black printing layer (thickness 3 μm) is formed on the surface of the retardation film of the circularly polarizing plate (the surface on the display side of the back plate 30) by the same method as the colored layer 40, and the shielding layer 50 is formed. A back plate 30'with attachment was obtained (FIG. 10 (a)).

(Laminating process)
The surface of the front plate 10'with the colored layer on the display side and one surface of the (meth) acrylic pressure-sensitive adhesive layer prepared above were subjected to corona treatment, and the treated surfaces were bonded to each other. Next, the exposed surface of the (meth) acrylic pressure-sensitive adhesive layer and the surface of the back plate 30'with the shielding layer on the visible side are subjected to corona treatment, and the treated surfaces are bonded to each other. It was bonded using a roll joining machine and cured by autograve to obtain an optical laminate of Example 1.

All corona treatments were performed under the following conditions.
Frequency: 20kHz / Voltage: 8.6kV / Power: 2.5kW / Speed: 6m / min

<Example 2>
The optical laminate of Example 2 was obtained by the same method as in Example 1 except that the method for forming the colored layer and the shielding layer was different and the layers were formed by the following methods.

(Formation of colored layer and shielding layer)
An electron beam vapor deposition device (product name: UNIVAC2050, manufactured by UNIVAC) is used to form a thin-film deposition layer with a thickness of 80 Å on the surface of the front plate 10 on the display side using TiO ₂ as a vapor deposition source, and In is formed on the vapor deposition layer. forming a thick deposition layer of 500Å as a vapor deposition source, a TiO ₂ to form a thick deposition layer of 150Å as a vapor deposition source thereon, the thickness of 150Å the for Al ₂ O ₃ deposition source thereon A thin-film deposition layer was formed. In this way, a golden vapor deposition layer (thickness <1 μm) composed of four layers was formed. Then, in the colored layer forming region, the coating thickness after drying is increased by screen printing on the surface of the golden vapor deposition layer using the protective layer forming composition (transparent) prepared above as an ink and using a 460 mesh screen. A protective layer was formed by printing with a discharge amount of 5 μm, and the golden vapor deposition layer in the region where the protective layer was not formed was removed by etching. In this way, a colored layer 40 having a layer structure (overall thickness of more than 5 μm and less than 6 μm) having a “golden vapor deposition layer (thickness <1 μm) / protective layer (thickness of 5 μm)” is formed on the entire circumference of the peripheral portion. did.

Next, on the surface of the retardation film of the circularly polarizing plate (the surface on the display side of the back plate 30), printing similar to the printing at the time of forming the shielding layer in Example 1 was performed twice to obtain a “black printing layer (thickness 3 μm)”. ) / Black print layer (thickness 3 μm) ”, a shielding layer 50 having a layer structure (overall thickness 6 μm) was formed.

<Example 3>
The optical laminate of Example 3 was obtained by the same method as in Example 1 except that the method for forming the colored layer and the shielding layer was different and the layers were formed by the following methods.

(Formation of colored layer and shielding layer)
On the display side surface of the front plate 10, printing similar to the printing at the time of forming the colored layer in Example 1 was performed three times using the colorant-containing layer forming composition (white) prepared above, and "white printing" was performed. A colored layer 40 having a layer structure (total thickness of 9 μm) of “layer (thickness 3 μm) / white print layer (thickness 3 μm) / white print layer (thickness 3 μm)” was formed.

Next, on the surface of the retardation film of the circularly polarizing plate (the surface on the display side of the back plate 30), printing similar to the printing at the time of forming the shielding layer in Example 1 was performed twice, and the "black printing layer (thickness)" was printed. A shielding layer 50 having a layer structure (overall thickness of 6 μm) of “3 μm) / black print layer (thickness 3 μm)” was formed.

<Comparative example 1>
The optical laminate of Comparative Example 1 was obtained by the same method as in Example 1 except that the method for forming the colored layer and the forming surface were different and the layer was formed by the following method and the shielding layer was not formed.

(Formation of colored layer)
On the TAC surface of the circularly polarizing plate (the surface on the visible side of the back plate 30), printing similar to the printing at the time of forming the colored layer in Example 1 was performed twice, and "black printing layer (thickness 3 μm) / black printing layer" was performed. (Thickness 3 μm) ”was formed. On top of that, printing similar to the printing at the time of forming the colored layer in Example 3 is performed to form a "white printing layer (thickness 3 μm) / white printing layer (thickness 3 μm) / white printing layer (thickness 3 μm)". Then, the layer of "black print layer (thickness 3 μm) / black print layer (thickness 3 μm) / white print layer (thickness 3 μm) / white print layer (thickness 3 μm) / white print layer (thickness 3 μm)" A colored layer 40 having a structure (total thickness of 15 μm) was formed.

[Evaluation of bubble generation]
The optical laminates of Examples 1 to 3 and Comparative Example 1 were visually confirmed for the generation of air bubbles, and evaluated according to the following criteria. Table 1 shows the evaluation results.
A: No bubbles were observed immediately after bonding,
B: A few bubbles were observed immediately after bonding, but no bubbles were observed after the auto-brave treatment.
C: Bubbles were observed only around the colored layer (non-display area) in the bonded layer.
D: Bubbles were observed around the colored layer (non-display area) and in the display area in the bonded layer.

[Evaluation of steps]
The difference between the maximum height and the minimum height of the outermost surface of the front surface plate of the optical laminates of Examples 1 to 3 and Comparative Example 1 was measured, and the determination was made as follows based on the difference.
A: Less than 10 nm,
B: 10 nm or more and less than 50 nm,
C: 50 nm or more and less than 200 nm,
D: 200 nm or more.

[Measurement of optical density]
With respect to the optical laminates of Examples 1 to 3 and Comparative Example 1, each optical laminate was cut into 5 cm × 5 cm so as to include the non-display region B, and used as a measurement sample for optical farming degree measurement. This measurement sample was set in an optical density measuring instrument (product name: 361T, manufactured by X-Rite) so that the front plate was on the top, and the non-display part B of the measurement sample was focused on to measure the optical farming degree. ..

10 Front plate, 20 1st bonded layer, 21 2nd bonded layer, 30 Back plate, 40 Colored layer, 50 Shielding layer, 60a, 60b, 60c polarizing plate, 70 Touch sensor panel, 81 Liquid crystal display unit, 82 Organic EL display unit, 90 backlight unit, 100, 100', 101, 102, 103, 104 optical laminate, 200 display laminate, 300 image display device, 301, 302 liquid crystal display device, 303, 304 organic EL display device, 305,306 Flexible display.

Claims (9)

The front plate, the bonding layer, and the back plate are provided in order from the visual side to the display side.
A colored layer provided on a part of the surface of the front plate on the display side,
A shielding layer provided on a part of the surface of the back plate on the display side is further provided.
An optical laminate in which the colored layer and the shielding layer overlap in at least a part of a region in a plane direction orthogonal to the lamination direction. The optical laminate according to claim 1, wherein the shielding layer contains a black pigment. The optical laminate is divided into a display region and a non-display region in a plane direction orthogonal to the lamination direction.
The optical laminate according to claim 1 or 2, wherein the non-display region has an optical density of 3 or more. The optical laminate according to claim 3, wherein the shielding layer is provided in the non-display region. The optical laminate according to any one of claims 1 to 4, wherein the front plate is a resin film. The optical laminate according to any one of claims 1 to 5, wherein the back plate has a polarizing plate. An image display device comprising the optical laminate according to any one of claims 1 to 6, wherein the front plate is arranged on the front surface. The manufacturing method for manufacturing the optical laminate according to any one of claims 1 to 6.
A step of forming the colored layer on a part of the surface of the front plate on the display side to obtain a front plate with a colored layer.
A step of forming the shielding layer on a part of the surface of the back plate on the display side to obtain a back plate with a shielding layer.
A manufacturing method comprising a step of laminating the front plate with a colored layer, the bonding layer, and the back plate with a shielding layer to obtain the optical laminate. A manufacturing method for manufacturing an optical laminate according to any one of claims 1 to 6.
A step of forming the colored layer on a part of the surface of the front plate on the display side to obtain a front plate with a colored layer.
A step of laminating the front plate with a colored layer, the bonding layer, and the back plate to obtain an optical laminate precursor.
A manufacturing method comprising a step of forming the shielding layer on a part of the display-side surface of the back plate of the optical laminate precursor.

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