CN112041712B - Optical laminate and method for producing same - Google Patents
Optical laminate and method for producing same Download PDFInfo
- Publication number
- CN112041712B CN112041712B CN201980027035.5A CN201980027035A CN112041712B CN 112041712 B CN112041712 B CN 112041712B CN 201980027035 A CN201980027035 A CN 201980027035A CN 112041712 B CN112041712 B CN 112041712B
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- layer
- optical laminate
- colored layer
- film
- thickness
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Polarising Elements (AREA)
- Laminated Bodies (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The purpose of the present invention is to provide an optical laminate that is provided with a colored layer and that has durability against bending. An optical laminate comprising a front plate, a bonding layer, and a back plate in this order, and further comprising a colored layer provided on a part of the surface of the back plate on the bonding layer side.
Description
Technical Field
The present invention relates to an optical laminate and a method for producing the same, and also relates to an image display device and a polarizing plate with a colored layer.
Background
As various image display devices such as liquid crystal display devices and organic electroluminescence display devices, there is known a configuration in which a front panel is provided on the visible side of a display panel for the purpose of protecting the display panel. When the display panel is a touch panel, the front panel may function as a touch surface.
Jp 2014-238533 a (patent document 1) describes that a front panel is provided on a visible side of a display panel of an image display device, and a printing layer is provided as a coloring layer on a peripheral portion of a surface of the front panel on the display panel side. The colored layer also functions as a shielding layer for forming a non-display region of the image display device.
Documents of the prior art
Patent literature
Patent document 1: japanese patent laid-open No. 2014-238533
Disclosure of Invention
In recent years, there has been an increasing demand for flexible image display devices. The flexible image display device can be provided on a surface other than a flat surface or a folded surface, and can be formed into a folded roll shape when carried, thereby improving portability.
In order to construct a flexible image display device, each component needs to have durability against bending. The colored layer may be cracked or discolored by repeated bending, and thus has a problem of insufficient durability against bending.
The purpose of the present invention is to provide an optical laminate that has a colored layer and that is durable against bending, an image display device that has the optical laminate, a polarizing plate with a colored layer that has the colored layer, and a method for manufacturing the optical laminate.
The invention provides an optical laminate, an image display device, a polarizing plate with a colored layer, and a method for manufacturing the optical laminate, which are described below.
An optical laminate comprising a front plate, a bonding layer, and a back plate in this order, and further comprising a colored layer provided on a part of the surface of the back plate on the bonding layer side.
[ 2] the optical laminate according to [ 1], wherein the colored layer has a thickness of 3 μm or more.
The optical laminate according to [ 1] or [ 2], wherein the front sheet is a resin film.
An optical laminate according to any one of [ 1] to [ 3 ], wherein the back plate has a polarizing plate.
An image display device comprising the optical laminate according to any one of [ 1] to [ 4 ], wherein the front panel is disposed on a front surface.
[ 6 ] A polarizing plate with a colored layer, comprising a polarizing plate and a colored layer provided on a part of the surface of the polarizing plate on the viewing side.
[ 7 ] A method for producing the optical laminate according to any one of [ 1] to [ 4 ], comprising:
a colored layer forming step of forming the colored layer on a part of the outermost layer of the back plate on the bonding layer side; and
and a laminating step of laminating the adhesive layer on the outermost layer after the coloring layer forming step.
[ 8 ] an optical laminate comprising a front plate, a bonding layer and a back plate in this order,
further comprising a colored layer provided on a part of the surface of the back plate on the side of the bonding layer,
the colored layer includes a plating layer.
[ 9 ] the optical laminate according to [ 8 ], wherein the colored layer further has a protective layer covering the plating layer.
[ 10 ] the optical laminate according to [ 8 ] or [ 9 ], wherein the colored layer further has a base layer covered with the plating layer.
An optical laminate according to [ 11 ] or [ 10 ], wherein the base layer contains a black pigment.
The optical laminate according to any one of [ 8 ] to [ 11 ], wherein the colored layer has a thickness of 1 μm to 30 μm.
An optical laminate according to any one of [ 8 ] to [ 12 ], wherein the optical laminate is divided into a display region and a non-display region in a plane direction orthogonal to a lamination direction,
the colored layer is provided in the non-display region,
the optical density of the non-display region is 3 or more.
The optical laminate according to any one of [ 8 ] to [ 13 ], wherein the front plate is a resin film.
An optical laminate according to any one of [ 8 ] to [ 14 ], wherein the back plate has a polarizing plate.
An image display device comprising the optical laminate according to any one of [ 8 ] to [ 15 ], wherein the front panel is disposed on a front surface.
[ 17 ] A polarizing plate with a colored layer, comprising a polarizing plate and a colored layer provided on a part of the surface of the polarizing plate on the visible side,
the colored layer has a plating layer.
[ 18 ] A method for producing the optical laminate according to any one of [ 8 ] to [ 15 ], comprising:
a colored layer forming step of forming the colored layer on a part of the outermost layer of the back plate on the side of the bonding layer, and
and a laminating step of laminating the adhesive layer on the outermost layer after the coloring layer forming step.
According to the present invention, there can be provided an optical laminate which includes a colored layer and has durability against bending, an image display device including the optical laminate, a polarizing plate with a colored layer including the colored layer, and a method for manufacturing the optical laminate.
Drawings
Fig. 1 is a schematic cross-sectional view of an optical laminate according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of an image display device according to an embodiment of the present invention.
Fig. 3 is a plan view of the optical layered body viewed from the front panel side.
Fig. 4 is a diagram showing an example of a curved form in the case where the image display device is a flexible display.
Fig. 5 is a schematic cross-sectional view of an image display device according to embodiment 1 of the present invention.
Fig. 6 is a schematic cross-sectional view of an image display device according to embodiment 2 of the present invention.
Fig. 7 is a schematic cross-sectional view of an image display device according to embodiment 3 of the present invention.
Fig. 8 is a schematic cross-sectional view of an image display device according to embodiment 4 of the present invention.
Fig. 9 is a sectional view schematically showing an example of the method for producing an optical laminate according to the present invention.
Fig. 10 is a view schematically showing a test method for evaluating bendability.
Fig. 11 is a sectional view schematically showing a method for producing an optical laminate of example 1.
Fig. 12 is a sectional view schematically showing a method for producing an optical laminate of comparative example 1.
Detailed Description
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 of each component is appropriately adjusted to show the component in order to facilitate understanding of the component, and the scale of each component shown in the drawings does not necessarily coincide with the scale of the actual component.
[ optical layered body ]
Fig. 1 is a schematic cross-sectional view of an optical laminate according to an embodiment of the present invention. The optical laminate 100 of the present embodiment includes a front panel 10, a bonding layer 20, and a back panel 30 in this order from the visible side. The optical laminate 100 includes a colored layer 40, and the colored layer 40 is provided on a part of the surface of the back surface plate 30 on the bonding layer 20 side. The optical laminate 100 may be divided into a display region a and a non-display region B in a plane direction perpendicular to the lamination direction, and in this case, the colored layer 40 is preferably provided in the non-display region B. The optical laminate 100 is divided into a display region a and a non-display region B, and the case where the colored layer 40 is provided in the non-display region B will be described below as an example.
[ image display apparatus ]
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 includes an optical laminate 100 including a front panel 10 disposed on the front surface, and a display laminate 200 including a display unit.
Fig. 3 is a plan view of the image display device 300 viewed from the front panel 10 side. The optical density of the non-display region B is preferably 3 or more, and more preferably 3.2 or more. By setting the optical density of the non-display region B to the above numerical range, elements such as wirings disposed in the non-display region B are sufficiently shielded, and the visibility of the image in the display region a is improved. The colored layer 40 contributes to an increase in optical density of the non-display region B. In addition, the shape and color of the colored layer 40 can be seen through the adhesive layer 20 and the front panel 10, and thus the colored layer 40 also contributes to the design of the image display device 300. The colored layer 40 of the present invention may contain a metal, and in the case of containing a metal, reflected light from the metal can be seen as the color of the colored layer 40, thereby contributing to a design with a high-grade feeling.
The shape and size of the optical laminate 100 in the plane direction correspond to those of the image display device 300 using the same. The shape of the image display device 300 in the plane direction is preferably a square shape, and more preferably a square shape having long sides and short sides. The square shape is preferably rectangular. When the shape of the image display device 300 in the plane direction is rectangular, the length of the long side is, for example, 50mm to 300mm, preferably 100mm to 280 mm. The length of the short side is, for example, 30mm to 250mm, preferably 60mm to 220 mm. When the optical layered body 100 has a square shape, at least one of the R process, the notch process, and the hole forming process may be performed.
The thickness of the optical laminate 100 is preferably appropriately designed according to the functions of the front plate 10 and the back plate 30, and is not particularly limited, but is, for example, 40 to 300 μm, and preferably 70 to 200 μm.
The optical stack 100 is preferably bendable. The term "bendable" means that a good result is obtained in a bending test with a bending curvature of 2.5R. In the optical laminate according to the preferred embodiment of the present invention, good results were obtained in a bending test with a bending curvature of 2.5R. The bending test with a bending curvature of 2.5R was performed according to the method described in the examples described later.
The image display device 300 may be configured as a flexible display panel. Fig. 4 shows an example of a bending mode in the case where the image display device is a flexible display panel. Fig. 4 (a) shows a flexible display 305 which can be folded with the visible-side surface as the inner side, and fig. 4 (b) shows a flexible display 306 which can be rolled.
When the image display device 300 is a flexible display, a force of bending is repeatedly applied to the color layer 40 or a force of bending is continuously applied, and thus cracks or discoloration may occur. In the image display device 300, cracks and discoloration are likely to occur in the colored layer 40, which is not preferable. In addition, regardless of whether the image display device 300 is a flexible display, when the optical laminate 100 is flexible alone, a bending force may be applied when the optical laminate 100 is transported, or the like, and may cause cracking or discoloration of the color layer 40.
In the optical laminate 100 and the image display device 300 of the present invention, by providing the position of the colored layer 40 on the surface of the back surface plate 30 on the bonding layer 20 side, the occurrence of cracks and discoloration of the colored layer 40 can be suppressed even when a bending force is repeatedly or continuously applied. The optical laminate 100 and the image display device 300 of the present invention can prevent the occurrence of cracks and discoloration of the colored layer 40 even with respect to a force of bending the front panel 10 inward or a force of bending the front panel 10 outward. The position of stacking the colored layers 40 can be closer to the center in the stacking direction of the optical layered body 100 than in the case where the colored layers 40 are disposed on the front surface of the front plate 10.
Therefore, the stress generated in the colored layer 40 by the bending is reduced, and the above effect is considered to be obtained.
From such a viewpoint, the difference between the distance d1 (shown in fig. 1) from the surface of the colored layer 40 on the front panel 10 side to the outermost surface of the optical laminate 100 on the front panel 10 side and the distance d2 (shown in fig. 1) from the surface of the colored layer 40 on the front panel 10 side to the outermost surface of the optical laminate 100 on the back panel 30 side may be 0 μm to 50 μm, and is preferably 30 μm or less.
The relative size D (%) of the difference between the distance D1 and the distance D2 is preferably 25% or less, more preferably 20% or less, and still more preferably 15% or less. The lower limit is not particularly limited, and may be 0%. The relative size D (%) of the above difference is calculated by the following equation.
D＝100×|(d1-d2)/(d1+d2)|
The image display device 300 may be configured as a touch panel type image display device. The touch panel type image display device includes a touch sensor panel, and the front panel 10 included in the optical laminate 100 constitutes a touch surface.
Hereinafter, a specific embodiment (embodiments 1 to 4) of the image display device of the present invention will be described in detail to explain each constituent element.
< embodiment 1>
Fig. 5 is a schematic cross-sectional view of an image display device according to embodiment 1 of the present invention. The image display device of the present embodiment is a touch panel type liquid crystal display device. The liquid crystal display device 301 includes, in order from the visible side, a front panel 10, a bonding layer 20, a polarizing plate 60a, a touch sensor panel 70, a liquid crystal display element unit 81, a polarizing plate 60b, and a backlight unit 90. The liquid crystal display device 301 includes a colored layer 40 provided on a part of the surface of the polarizing plate 60a on the adhesive layer 20 side. The liquid crystal display device 301 may be divided into a display region a and a non-display region B in the plane direction, and in this case, the non-display region B is preferably provided with the colored layer 40.
In the liquid crystal display device 301, a laminate including the front panel 10, the adhesive layer 20, and the polarizing plate 60a and including the coloring layer 40 is configured as an optical laminate 101, and the liquid crystal display device 301 is configured using the optical laminate 101. In the present embodiment, the polarizing plate 60a functions as the back panel 30 of the optical layered body 101.
< embodiment 2>
Fig. 6 is a schematic cross-sectional view of an image display device according to embodiment 2 of the present invention. The image display device of the present embodiment is a touch panel liquid crystal display device. The liquid crystal display device 302 differs from the liquid crystal display device 301 shown in fig. 5 only in that the position where the polarizing plate 60a and the touch sensor panel 70 are laminated is replaced, and the colored layer 40 is provided on the surface of the touch sensor panel 70 on the side of the adhesive layer 20.
In the liquid crystal display device 302, a laminate including the front panel 10, the adhesive layer 20, and the touch sensor panel 70 and including the colored layer 40 is configured as an optical laminate 102, and the liquid crystal display device 302 is configured using the optical laminate 102. In the present embodiment, the touch sensor panel 70 also functions as the back panel 30 of the optical layered body 102.
< embodiment 3>
Fig. 7 is a schematic cross-sectional view of an image display device according to embodiment 3 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 the front panel 10, the adhesive layer 20, the polarizing plate 60c, the touch sensor panel 70, and the organic EL unit 82 in this order from the visible side. The organic EL display device 303 includes a colored layer 40 provided on a part of the surface of the polarizing plate 60c on the bonding layer 20 side. The organic EL display device 303 may be divided into a display region a and a non-display region B in the plane direction, and in this case, the non-display region B is preferably provided with the colored layer 40.
In the organic EL display device 303, a laminate including the front panel 10, the adhesive layer 20, and the polarizing plate 60c and including the colored layer 40 is formed as the optical laminate 103, and the organic EL display device 303 is formed using the optical laminate 103. In the present embodiment, the polarizing plate 60c also functions as the back panel 30 of the optical layered body 103.
< embodiment 4>
Fig. 8 is a schematic cross-sectional view of an image display device according to embodiment 4 of the present invention. The image display device of the present embodiment is a touch panel type organic EL display device. The organic EL display device 304 is different from the organic EL display device 303 shown in fig. 7 only in that the lamination position of the polarizing plate 60c and the touch sensor panel 70 is changed, and the colored layer 40 is provided on the surface of the touch sensor panel 70 on the adhesive layer 20 side.
The organic EL display device 304 is configured by a laminate including the front panel 10, the adhesive layer 20, and the touch sensor panel 70 and including the colored layers 40 as the optical laminate 104, and 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 panel 30 of the optical layered body 104.
(display unit)
Examples of the display unit included in the image display device 300 include display units including display elements 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 type display element.
The image display device 300 may be used as a flexible display. In this case, the display element can have flexibility, and thus is preferably a liquid crystal display element, an organic EL display element, or an inorganic EL display element.
(front panel)
The material and thickness of the front panel 10 are not limited as long as they are plate-shaped bodies that transmit light, and may be single-layer or multi-layer, and examples thereof include plate-shaped bodies made of glass (e.g., glass plates, glass films, etc.) and plate-shaped bodies made of resin (e.g., resin plates, resin sheets, resin films, etc.).
As the glass plate, strengthened glass for display is preferably used. The thickness of the glass plate is, for example, 50 to 1000. mu.m. By using the glass plate, the front panel 10 having excellent mechanical strength and surface hardness can be constituted.
The resin film is not limited as long as it is a resin film that transmits light.
Examples of the film include films formed of polymers such as cellulose triacetate, cellulose acetate butyrate, ethylene-vinyl acetate copolymer, cellulose propionate, cellulose butyrate, cellulose acetate propionate, polyester, polystyrene, polyamide, polyetherimide, polyacrylic acid, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyethersulfone, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymers may be used alone or in combination of 2 or more. When the image display device 300 is a flexible display, a resin film made of a polymer such as polyimide, polyamide, or polyamideimide, which has excellent flexibility and has high strength and high transparency, is preferably used.
The resin film may be a film having a hard coat layer provided on at least one surface of the base film to further increase the hardness. The hard coat layer may be formed on one surface of the base film or on both surfaces. In the case where the image display device 300 is a touch panel type image display device, a resin film having a hard coat layer is preferably used because the surface of the front panel 10 serves as a touch surface. By providing the hard coat layer, a resin film having improved hardness and scratch resistance can be formed. The hard coat layer is a cured layer of, for example, an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. The hard coating may contain additives for the purpose of improving strength. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, and a mixture thereof. The thickness of the resin film is, for example, 30 to 2000. mu.m.
The front panel 10 may have a function as a touch sensor, a blue light blocking function, a viewing angle adjusting function, and the like, instead of only having a function of protecting the front surface of the image display device 300.
The thickness of the front panel 10 may be 10 to 500 μm, preferably 20 to 100 μm. In the case of a front panel having a hard coating, the thickness of the front panel also includes the thickness of the hard coating.
(laminating layer)
The bonding layer 20 is a layer sandwiched between and bonding the front panel 10 and the back panel 30, and is an adhesive layer or an adhesive layer. The adhesive layer 20 is preferably an adhesive layer in terms of being able to absorb the level difference of the colored layer 40 well.
The pressure-sensitive adhesive layer may be composed of a pressure-sensitive adhesive composition containing a resin such as a (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether resin as a main component. Among these, preferred is an adhesive composition containing a (meth) acrylic resin as a base polymer, which is excellent in transparency, durability, heat resistance, and the like. The adhesive composition may be an active energy ray-curable type or a thermosetting type.
As the (meth) acrylic resin (base polymer) used in the adhesive composition, for example, a polymer or copolymer in which 1 or 2 or more of (meth) acrylic esters such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate are used as monomers is preferably used. The polar monomer is preferably copolymerized in the base polymer. Examples of the polar monomer include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N-dimethylaminoethyl (meth) acrylate, and glycidyl (meth) acrylate.
The adhesive composition may contain only the above-mentioned base polymer, but usually also contains a crosslinking agent. Examples of the crosslinking agent include metal ions having a valence of 2 or more and a metal carboxylate salt formed between the crosslinking agent and a carboxyl group; polyamine compounds, and substances which form amide bonds with carboxyl groups; a polyepoxy compound, a polyhydric alcohol, and a substance forming an ester bond with a carboxyl group; a polyisocyanate compound, and a substance forming an amide bond with a carboxyl group. Among them, polyisocyanate compounds are preferable.
The active energy ray-curable adhesive composition is an adhesive composition comprising: the adhesive sheet has a property of being cured by irradiation with an active energy ray such as an ultraviolet ray or an electron beam, and a property of being capable of adhering to an adherend such as a film even before irradiation with an active energy ray and of being cured by irradiation with an active energy ray to adjust the adhesion force. The active energy ray-curable adhesive composition is preferably an ultraviolet ray-curable adhesive composition. The active energy ray-curable adhesive composition contains a base polymer, a crosslinking agent, and an active energy ray-polymerizable compound. Further, a photopolymerization initiator, a photosensitizer and the like may be contained as necessary.
The binder composition may contain additives such as fine particles, beads (resin beads, glass beads, and the like), glass fibers, resins other than the base polymer, tackifiers, fillers (metal powders, other inorganic powders, and the like), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, defoamers, anticorrosion agents, and photopolymerization initiators for imparting light scattering properties.
The organic solvent diluted solution of the adhesive composition may be applied to a substrate and dried. When an active energy ray-curable pressure-sensitive adhesive composition is used, a cured product having a desired degree of curing can be formed by irradiating the pressure-sensitive adhesive layer formed with an active energy ray.
From the viewpoint of absorbing the step of the colored layer 40, the thickness of the adhesive layer 20 is preferably larger than the thickness of the colored layer 40, and is, for example, preferably 3 μm to 100 μm, and more preferably 5 μm to 50 μm.
(Back plate)
The material and thickness are not limited as long as the back panel 30 is a plate-like body that can transmit light, and may be a single layer or a plurality of layers. The thickness of the back plate may be 10 to 1000 μm, preferably 20 to 500 μm, and more preferably 50 to 100 μm. The display unit may not be included in the rear panel.
As described above, the rear panel 30 may be formed using components used in a general image display device, such as the polarizing plates 60a and 60c and the touch sensor panel 70. The use of such components as back panel 30 is preferable because the number of components of image display device 300 can be reduced, and image display device 300 can be made thinner.
Although the case where the polarizing plates 60a and 60c and the touch sensor panel 70 are used as the back panel 30 has been described above, the back panel 30 is not limited to these, and may be a protective film on the visible side of the polarizing plate or a laminate of a polarizing plate and a touch sensor panel.
As the rear panel 30, a glass plate (e.g., a glass plate, a glass film, etc.) or a resin plate (e.g., a resin plate, a resin sheet, a resin film, etc.) may be used as well as the front panel 10. As specific examples of the plate-like body made of glass and the plate-like body made of resin, the above description regarding the front panel 10 is applied.
(colored layer)
The shape and color of the colored layer 40 are not limited, and can be selected as appropriate depending on the application and design. Examples of the colored layer 40 include layers colored in black, red, white, navy blue, silver, gold, and the like. The colored layer 40 may be formed of a single layer or a plurality of layers. When the colored layer 40 is formed of a plurality of layers, one color or a plurality of colors may be used as the color of the colored layer 40. The colored layer 40 may contain a metal, which may be contained in the plating layer.
The colored layer 40 can be formed by a printing method using ink or paint, a method of forming a colored layer 40 containing a metal pigment in advance and bonding the same, or the like. In addition, these methods may be combined. Coloring layer 40 is preferably formed on the surface of back surface plate 30. Specific examples of the printing method include gravure printing, offset printing, screen printing, and transfer printing from a transfer sheet. Printing by a printing method may be repeated to obtain a colored layer 40 having a desired thickness. The ink or paint used for forming the colored layer 40 contains, for example, a binder, a colorant, a solvent, and an optional additive.
Examples of the binder include chlorinated polyolefins (e.g., chlorinated polyethylene and chlorinated polypropylene), polyester resins, polyurethane 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 2 or more. The binder resin may be a thermally polymerizable resin or a photopolymerizable resin.
The colorant may be appropriately selected depending on the desired coloring. Examples of the colorant include inorganic pigments such as titanium white, zinc white, carbon black, iron oxide black, red iron oxide, vermilion, ultramarine, cobalt blue, chrome yellow, and titanium yellow; organic pigments or dyes such as phthalocyanine blue, indanthrene blue, isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, aniline black, and the like; metallic pigments made of scaly foils of aluminum, brass, and the like; a pearl pigment (pearl pigment) comprising a scaly foil such as titanium dioxide-coated mica or basic lead carbonate. The colorant is preferably contained in an amount of 50 to 200 parts by mass per 100 parts by mass of the binder resin.
The thickness of the colored layer 40 is preferably 1 μm to 50 μm, more preferably 3 μm to 30 μm, and may be 3 μm to 20 μm, from the viewpoint of suppressing a visible step and improving a shading effect. When the colored layer 40 is black, a high shielding effect can be obtained compared with other colors even if the thickness is small. Fig. 1 illustrates a case where the colored layer 40 has a uniform thickness and a rectangular cross-sectional shape, but the colored layer 40 may not have a uniform thickness and may have a cross-sectional shape having a tapered portion whose thickness becomes thinner toward the inside. By having the tapered portion, the entry of air that is likely to occur during lamination can be suppressed. When 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. The colored layer 40 preferably has an appropriate elastic force from the viewpoint of suppressing a visible step difference. The elasticity of the colored layer 40 can be adjusted according to the kind and the blending ratio of the binder used.
When coloring layer 40 is provided in the peripheral portion of rear panel 30, the coloring layer is not limited to the embodiment provided over the entire periphery of the peripheral portion, and may be provided only in a part of the peripheral portion in accordance with a desired design or the like. When the colored layer 40 is provided in the peripheral portion of the rear plate 30, the width thereof may be appropriately determined depending on the size of the display region, the desired design, and the like, and is preferably in the range of 1mm to 20mm, for example.
The arrangement position in the plane direction is not limited as long as the colored layer 40 is provided on a part of the surface of the back panel 30 on the bonding layer 20 side. In the image display device 300 shown in fig. 2 and 3, when the colored layer 40 is disposed in the peripheral portion, light leakage from the peripheral portion can be suppressed, and the colored layer is visible as a frame, so that design properties can be improved.
When the colored layer 40 contains a metal, the metal is preferably contained as a plating layer. The colored layer 40 may be formed by including a metal pigment in the printing layer or the coating layer, and the present inventors have found that the plating layer has higher durability against bending than the printing layer or the coating layer including a metal pigment. Therefore, when the colored layer 40 contains a metal, the colored layer is configured to contain a metal as a plating layer, which contributes to improvement of the durability against bending.
When the colored layer 40 includes a plating layer, the thickness of the colored layer 40 is preferably 30 μm or less, and more preferably 15 μm or less. By setting the thickness of the colored layer 40 within the above numerical range, the durability against bending can be improved. The thickness of the colored layer 40 is preferably 3 μm or more, and more preferably 6 μm or more. By making the thickness of the colored layer 40 to be 3 μm or more, the colored layer 40a is easily visible, contributing to improvement of design, and also contributing to improvement of the optical density of the non-display region B.
The optical laminate 100 may be provided with a shielding layer on the surface of the back surface plate 30 opposite to the surface on which the bonding layer 20 is provided, in addition to the coloring layer 40. The shielding layer may be provided in the non-display region B of the optical layered body 100, and is preferably provided on the colored layer 40 through the back surface plate 30. The blocking layer contributes to an increase in optical density of the non-display region B. Therefore, when the optical density of the non-display region B does not reach a desired value depending only on the colored layer 40, the shielding layer is preferably provided.
In this specification, a layer formed by a plating method is referred to as a plating layer. Therefore, the plating layer defined in the present specification is included in the plating layer formed by the direct plating method on the surface of back surface plate 30 or the surface of the foundation layer formed on the surface of back surface plate 30, or the plating layer formed by transferring the layer including the plating layer formed on the substrate to the surface of back surface plate 30. The plating layer formed by the direct plating method is preferable because it has higher durability against bending. In the case where the coloring layer 40 is formed by being transferred to the surface of the back panel 30, for example, a thermal transfer method may be used, but the back panel 30 may be deformed by heat when the thermal transfer method is performed, and a dimensional change may occur, and therefore, a direct plating method is preferable from this point of view.
Specific examples of the plating method include known plating methods such as electroplating, electroless plating, hot dip plating, chemical vapor deposition, and physical vapor deposition. Examples of physical vapor deposition include vacuum vapor deposition,Vapor deposition systems such as molecular beam vapor deposition and ion beam vapor deposition, which are methods of heating and evaporating an evaporation source, and sputtering systems such as magnetron sputtering and ion beam sputtering. In this specification, the metal constituting the plating layer may be Al2O3、TiO2、SiO2In, etc.
The plating layer can be formed into a desired shape in accordance with patterning. By patterning, a plating layer can be provided on a part of the surface of back surface plate 30 on the bonding layer 20 side. This enables, for example, the plated layer formed in the display region a to be removed, thereby making it possible to make the distinction between the non-display region B and the display region a clearer and to improve the visibility of the display region a. Specific patterning methods for forming a plating layer by the direct plating method include:
i) a method in which a plating layer is formed on the entire surface of rear plate 30, then a transparent protective layer is applied only to the region of the plating layer corresponding to colored layer 40, and the region not applied with the protective layer is removed by etching,
ii) a method of protecting the surface of back surface plate 30 except for the region corresponding to colored layer 40 with a mask, and then forming a plating layer only in the region corresponding to colored layer 40.
The thickness of the plating layer is preferably 100nm to 3000nm, more preferably 500nm to 2000 nm. When the thickness of the plating layer is 100nm or more, reflected light from the plating layer is easily visible. Further, the durability against bending can be improved by setting the thickness of the plating layer to 3000nm or less.
When the colored layer 40 has a plating layer, it may be composed of a single layer of the plating layer, or may be composed of a plurality of layers including the plating layer. When the colored layer 40 has another layer on the upper side of the plating layer (the bonding layer 20 side), the layer on the upper side of the plating layer is preferably a transparent layer at least to the extent that reflected light from the plating layer is visible, and for example, is preferably a transparent protective layer. Specifically, the protective layer may be a transparent protective layer provided to prevent the removal of the plating layer of the colored layer 40 during the patterning process. The colored layer 40 may have a colorant-containing layer having high light-shielding properties, a foundation layer for improving adhesion, or the like on the lower side of the plating layer (on the rear panel 30 side). The protective layer provided so as to cover the plating layer may be formed so as to cover at least a part of the visible-side surface of the plating layer, and need not be formed so as to cover the entire surface including the side surface of the plating layer. The base layer provided on the lower side of the plating layer may be covered with the plating layer, and the plating layer may be formed so as to cover at least a part of the visible-side surface of the base layer, and need not be formed so as to cover the entire surface including the side surface of the base layer.
Examples of the colorant contained in the colorant-containing layer include carbon black such as acetylene black and black colorants such as iron black. The protective layer and the colorant-containing layer can be formed by a printing method, a coating method, or the like. Specific examples of the printing method include gravure printing, offset printing, screen printing, and transfer printing using a transfer sheet. Printing by the printing method can be repeated to obtain a layer having a desired thickness. Examples of the ink used in the printing method include inks containing a binder, a solvent, and an optional additive. When the colored layer-containing layer is formed, an ink containing a colorant is used.
Examples of the binder include chlorinated polyolefins (e.g., chlorinated polyethylene and chlorinated polypropylene), polyester resins, polyurethane resins, acrylic resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, and cellulose resins. The binder resin may be used alone, or 2 or more kinds may be used in combination. The binder resin may be a thermally polymerizable resin or a photopolymerizable resin.
When the colorant-containing layer is formed by a printing method, it is preferable to use an ink containing 50 to 200 parts by mass of a colorant per 100 parts by mass of a binder resin.
When the colored layer 40 is provided in the peripheral portion of the rear panel 30, the colored layer is not limited to the form provided over the entire periphery of the peripheral portion, and may be provided only in a part of the peripheral portion in accordance with a desired design or the like. When the colored layer 40 is provided in the peripheral portion of the rear plate 30, the width thereof may be appropriately determined depending on the size of the display region, the desired design, and the like, and is preferably in the range of 1mm to 20mm, for example. The colored layer 40 is preferably provided over the entire non-display region, but may be provided in a part of the non-display region.
(polarizing plate)
Examples of the polarizing plate include a stretched film having a dye having absorption anisotropy adsorbed thereon, a film obtained by coating and curing a dye having absorption anisotropy, and the like included as a polarizer.
Examples of the dye having absorption anisotropy include a dichroic dye. As the dichroic dye, specifically, iodine or a dichroic organic dye can be used. The dichroic organic dye includes a dichroic direct dye composed of a disazo compound such as c.i. direct RED 39, and a dichroic direct dye composed of a compound such as trisazo or tetraazo. Examples of the film used as a polarizer and coated with a dye having absorption anisotropy include a stretched film having a dye having absorption anisotropy adsorbed thereon, and a film having a layer obtained by coating and curing a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal. A film obtained by applying and curing a dye having absorption anisotropy is preferred because it is not limited in the bending direction as compared with a stretched film in which a dye having absorption anisotropy is adsorbed.
(1) Polarizing plate having stretched film as polarizer
A polarizing plate having a polarizer made of a stretched film having a dye having absorption anisotropy adsorbed thereon will be described. The polarizer, i.e., the stretched film having the dye having absorption anisotropy adsorbed thereon is usually produced through the following steps: a step of uniaxially stretching a polyvinyl alcohol resin film; a step of adsorbing a dichroic dye by dyeing a polyvinyl alcohol resin film with the dichroic dye; and a step of treating the polyvinyl alcohol resin film having the dichroic dye adsorbed thereon with an aqueous boric acid solution; and washing the substrate after the treatment with the aqueous boric acid solution. The polarizer may be used as it is, or may be used as a polarizing plate by attaching a transparent protective film to one or both surfaces thereof. The thickness of the polarizer thus obtained is preferably 2 to 40 μm.
The polyvinyl alcohol resin is obtained by saponifying a polyvinyl acetate resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith may be used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
The saponification degree of the polyvinyl alcohol resin is usually about 85 to 100 mol%, and preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and for example, polyvinyl formal or polyvinyl acetal obtained by modifying aldehydes may be used. The polymerization degree of the polyvinyl alcohol resin is usually about 1000 to 10000, and preferably in the range of 1500 to 5000.
A film made of such a polyvinyl alcohol resin can be used as a raw material film for a polarizing plate. The method for forming the film of the polyvinyl alcohol resin is not particularly limited, and a known method can be used for forming the film. The thickness of the polyvinyl alcohol-based raw material film may be, for example, about 10 μm to 150 μm.
The uniaxial stretching of the polyvinyl alcohol resin film may be performed before, simultaneously with, or after the dyeing with the dichroic dye. In the case of uniaxial stretching after dyeing, the uniaxial stretching may be performed before boric acid treatment or may be performed during boric acid treatment. In addition, the uniaxial stretching may be performed at these plural stages. In the case of uniaxial stretching, the stretching may be performed uniaxially between rolls having different peripheral speeds, or uniaxially by using a heat roll. The uniaxial stretching may be dry stretching in which stretching is performed in the air, or wet stretching in which stretching is performed in a state where the polyvinyl alcohol resin film is swollen with a solvent. The stretching ratio is usually about 3 to 8 times.
The material of the protective film to be bonded to one surface or both surfaces of the polarizer is not particularly limited, and examples thereof include films known in the art, such as a cyclic polyolefin resin film, a cellulose acetate resin film made of a resin such as cellulose triacetate and cellulose diacetate, a polyester resin film made of a resin such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, a polycarbonate resin film, a (meth) acrylic resin film, and a polypropylene resin film. From the viewpoint of light 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 retardation.
(2) Polarizing plate having polarizer formed of film of liquid crystal layer
A polarizing plate including a film formed of a liquid crystal layer as a polarizer will be described. Examples of the film used as a polarizer and coated with a dye having absorption anisotropy include a film obtained by coating a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a liquid crystal compound on a substrate and curing the coating. The film may be used as a polarizing plate by peeling off a substrate or using the film together with a substrate, or may be used as a polarizing plate having a protective film on one surface or both surfaces thereof. Examples of the protective film include those similar to polarizing plates provided with the stretched film as a polarizer.
The film obtained by applying and curing the dye having absorption anisotropy is preferably a thin film, but if it is too thin, the strength tends to be reduced and the processability tends to be deteriorated. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 to 3 μm.
Specific examples of the film obtained by applying the dye having the absorption anisotropy include films described in japanese patent application laid-open nos. 2013-37353 and 2013-33249.
The polarizing plate may further include a retardation film. The retardation film may include 1 or 2 or more retardation layers. The retardation layer may be a positive A plate or a positive C plate such as a λ/4 plate or a λ/2 plate. The retardation layer may be formed of a resin film exemplified as a material of the above-described protective film, 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 substrate film. When the polarizer and the retardation film are arranged so that the absorption axis of the polarizer and the slow axis of the retardation film form a predetermined angle, the polarizing plate has an antireflection function, that is, functions as a circular polarizing plate.
(touch sensor panel)
The touch sensor panel is not limited as long as it is a sensor capable of detecting a touched position, and examples thereof include a resistive film type, a capacitive coupling type, an optical sensor type, an ultrasonic wave type, an electromagnetic induction coupling type, a surface acoustic wave type, and the like. Since the cost is low, a resistive touch sensor panel or a capacitive touch sensor panel is preferably used.
An example of a resistive touch sensor panel includes a pair of substrates arranged to face each other, an insulating spacer sandwiched between the pair of substrates, a transparent conductive film as a resistive film provided on the front surface of the inner side of each substrate, and a touch position detection circuit. In an image display device provided with a resistive touch sensor panel, when the surface of the front panel 10 is touched, the opposing resistive films are short-circuited, and a current flows through the resistive films. The touch position detection circuit detects a change in voltage at that time, and detects the touched position.
An example of a capacitive coupling type touch sensor panel includes a substrate, a position detection transparent electrode provided on the entire surface of the substrate, and a touch position detection circuit. In an image display device provided with a capacitive coupling type touch sensor panel, when the surface of the front panel 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 detects the touched position.
The thickness of the touch sensor panel may be 5 to 500 μm, preferably 10 to 100 μm.
[ method for producing optical laminate ]
The method for manufacturing an optical laminate according to an embodiment of the present invention includes: a coloring layer forming step of forming the coloring layer on a part of the outermost layer on the bonding layer side of the rear panel; and a laminating step of laminating the adhesive layer on the outermost layer after the color layer forming step. Fig. 9 is a sectional view schematically showing a method for manufacturing an optical laminate according to an embodiment of the present invention. A method for manufacturing an optical laminate according to an embodiment of the present invention includes: a step of preparing a rear panel 30 (fig. 9 a), a step of forming a coloring layer 40 on the surface of the rear panel 30 (fig. 9 b), and a step of laminating the rear panel 30 on which the coloring layer 40 is formed, the bonding layer 20, and the front panel 10 to obtain an optical laminate 100 (fig. 9 e).
The lamination process (fig. 9 e) may be preceded by a process of preparing the front panel 10 (fig. 9 c) and a process of providing the adhesive layer 20 on the surface of the front panel 10 (fig. 9 d).
When the back panel 30 is a polarizing plate, the back panel having the colored layer 40 formed thereon obtained in the intermediate stage of the above-described manufacturing method (the laminate obtained in fig. 9(b)) becomes a polarizing plate with a colored layer. The surface of rear panel 30 on which colored layer 40 is formed is the visible-side surface of the polarizing plate. The polarizing plate with a colored layer contributes to obtaining the optical laminate 100 having high durability against bending as described above.
When back panel 30 is a composite layer, in fig. 9(a), a step of preparing a part of back panel 30 including the outermost layer on the bonding layer 20 side of back panel 30 may be used instead of preparing back panel 30. In this case, the timing of forming back panel 30 made of a composite layer is not limited, and may be after the step of fig. 9 (e). The method shown in fig. 11 described later corresponds to this method. The expression "outermost layer on the bonded layer side of back panel 30" includes both the outermost layer before back panel 30 and the outermost layer after back panel 30.
[ use of image display device ]
The image display device according to the present invention can be used for mobile devices such as smartphones and tablets, televisions, digital cameras, electronic billboards, measuring instruments and meters, business machines, medical machines, and computing machines. The optical laminate of the present invention has durability against bending even though it has a colored layer, and therefore, can provide a high-quality image display device in which the occurrence of defects in appearance is suppressed.
Examples
The present invention will be described in further detail with reference to examples, but the present invention is not limited to these examples.
Examples 1 to 3, comparative examples 1 and 2
< preparation of composition for Forming colored layer (Black color) >
[ ink Components ]
Acetylene black 15% by mass
75% by mass of polyester
Glutamic acid dimethyl ester 2.5 mass%
Succinic acid 2% by mass
5.5% by mass of isophorone
[ curing agent ]
Aliphatic polyisocyanate 75 mass%
25% by mass of ethyl acetate
[ solvent ]
Isophorone
[ production method ]
The curing agent 10 parts by mass and the solvent 10 parts by mass were added to 100 parts by mass of the ink components and stirred to obtain a composition (black) for forming a colored layer.
< preparation of composition for Forming colored layer (white) >
[ ink Components ]
Titanium dioxide 50% by mass
39% by mass of a polyester
2.5% by mass of dimethyl glutamate
Succinic acid 2% by mass
Isophorone 6.5 mass%
[ curing agent ]
75% by mass of aliphatic polyisocyanate
25% by mass of ethyl acetate
[ solvent ]
Isophorone
[ production method ]
The curing agent 10 parts by mass and the solvent 10 parts by mass were added to 100 parts by mass of the ink components, and the mixture was stirred to obtain a composition (white) for forming a colored layer.
< example 1>
The optical laminate of example 1 was produced in the order shown in fig. 11. Specifically, a window film having a thickness of 70 μm (50 μm base film, 10 μm hard coat layers, 177mm in length × 105mm in width) having hard coat layers formed on both surfaces of the base film was prepared as the front panel 10 (fig. 11(c)), and a (meth) acrylic pressure-sensitive adhesive layer (25 μm in thickness, 177mm in length × 105mm in width) was prepared as the adhesive layer 20. 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 dendritic polymer compound having a polyfunctional acrylic group at the end. Thereafter, corona treatment was performed on the bonding surface of the window film to the adhesive layer and the bonding surface of the adhesive layer to the window film.
Next, the window film is bonded to the pressure-sensitive adhesive layer to obtain a window film with a pressure-sensitive adhesive layer (fig. 11 d).
Further, a composition containing a dichroic dye and a polymerizable liquid crystal compound was applied to a substrate and cured to obtain a polarizer having a thickness of 2 μm. A cellulose Triacetate (TAC) film having a thickness of 25 μm was bonded to the polarizer via an adhesive layer. The substrate was peeled off, and a retardation film (thickness 17 μm, layer composition: protective film layer (cured layer of acrylic resin composition, thickness 1 μm)/adhesive layer (thickness 5 μm)/lambda/4 plate (thickness 3 μm)/adhesive layer (thickness 5 μm)/positive C plate (thickness 3 μm) composed of layer cured of liquid crystal compound and alignment film was laminated on the exposed surface. A polarizing plate 60d ("TAC/polarizer/retardation film" layer configuration, thickness 44 μm, longitudinal 177mm × transverse 105mm) thus prepared was prepared (fig. 11(a)), and on the surface of the TAC of the polarizing plate 60d, the prepared composition for forming a colored layer (black) was used as ink and a 460-mesh screen was used, and printing was repeated by screen printing at a discharge amount of 3 μm after drying 2 times, and a black colored layer 40 having a thickness of 6 μm and a width of 5mm was formed over the entire circumference of the peripheral portion to obtain a polarizing plate with a colored layer (fig. 11 (b)).
Then, the window film with the adhesive layer and the polarizing plate with the colored layer were laminated so that the surfaces on which the adhesive layer and the colored layer were formed were corona-treated, respectively, and then the surfaces were set to the inside, and the laminated films were bonded using a roll bonder (fig. 11 (e)). Then, a touch sensor panel 71 was laminated on the surface of the polarizing plate 60d opposite to the window film side with an adhesive layer 21 (thickness 25 μm) interposed therebetween, with the cycloolefin-based resin film as a surface layer (touch sensor pattern (thickness 10 μm) was disposed on the cycloolefin-based resin film (thickness 23 μm)), to obtain an optical laminate of example 1 (fig. 11 (f)). In the optical laminate of example 1, the laminate composed of "polarizing plate 60d, adhesive layer 21, and touch sensor panel 71" corresponds to back surface plate 30. The distance d1 between the window film side surface of the colored layer 40 and the outermost surface of the optical laminate on the window film side was 89 μm. The distance d2 between the surface of the colored layer 40 on the side away from the window film and the outermost surface of the optical laminate on the side of the cycloolefin resin film was 102 μm. The magnitude of the difference is 13 μm, and the magnitude of the relative difference D is 6.8% (≈ 100 × | (102-89)/(102+89) |).
< example 2>
An optical laminate was produced in the same manner as in example 1, except that printing was performed by screen printing, wherein the discharge amount of the coating thickness after drying was 6 μm, and printing was repeated 2 times, thereby forming a colored layer 40 having a thickness of 12 μm and a width of 5mm over the entire circumference of the peripheral portion. The distance D1 is 83 μm, the distance D2 is 102 μm, the difference is 19 μm in size and the relative size D is 10.3% (≈ 100 × | (102-83)/(102+83) |).
< example 3>
An optical laminate was produced in the same manner as in example 1 except that, when the colored layer was formed, printing was repeated by screen printing using the composition for forming a colored layer (black) as an ink, the application thickness after drying 2 times was set to a discharge amount of 3 μm, and then, printing was repeated by screen printing using the composition for forming a colored layer (white) as an ink, the application thickness after drying 3 times was set to a discharge amount of 5 μm, from the printed layer, and the white colored layer 40 was formed in a thickness of 21 μm and a width of 5mm over the entire circumference of the peripheral portion. The distance D1 is 74 μm, the distance D2 is 102 μm, the difference is 28 μm in size and the relative size D is 15.9% (≈ 100 × | (102-74)/(102+74) |).
< comparative example 1>
The optical laminate of comparative example 1 was produced in the order shown in fig. 12. Specifically, a window film having a thickness of 70 μm (50 μm for the base film, 10 μm for each hard coat layer, 177mm in the vertical direction × 105mm in the horizontal direction) in which hard coat layers were formed on both surfaces of the base film was prepared as the front panel 10 (fig. 12 (b)). 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. Then, the prepared composition for forming a colored layer (black) was used as an ink on the surface of the window film to be bonded to the pressure-sensitive adhesive layer, and printing was repeated 2 times by screen printing with a discharge amount of 6 μm after drying to form a black colored layer 41 having a thickness of 12 μm and a width of 5mm over the entire circumference of the peripheral portion, thereby obtaining a window film with a colored layer (fig. 12 (c)).
As the adhesive layer 20, a (meth) acrylic pressure-sensitive adhesive layer (thickness 25 μm, 177mm in the vertical direction × 105mm in the horizontal direction) was prepared, and the surface to be adhered to the window film was subjected to corona treatment. Then, the surface of the window film on which the colored layer is formed is subjected to corona treatment, and then the adhesive layer is attached to obtain a window film provided with the colored layer and the adhesive layer (fig. 12 (d)).
Further, a composition containing a dichroic dye and a polymerizable liquid crystal compound was applied to a substrate and cured to obtain a polarizer having a thickness of 2 μm. A cellulose Triacetate (TAC) film having a thickness of 25 μm was bonded to the polarizer via an adhesive layer. The substrate was peeled off, and a retardation film (thickness: 17 μm, layer constitution: protective film layer (cured layer of acrylic resin composition, thickness: 1 μm)/adhesive layer (thickness: 5 μm)/lambda/4 plate (thickness: 3 μm)/adhesive layer (thickness: 5 μm)/positive C plate (thickness: 3 μm) comprising layer cured of liquid crystal compound and alignment film was laminated on the exposed surface. The polarizing plate 60d (layer structure of "TAC/polarizer/phase difference film") thus prepared was prepared, having a thickness of 44 μm, 177mm in length by 105mm in width (FIG. 12 (a)). Then, the TAC side surface of the polarizing plate 60d is subjected to corona treatment, and the polarizing plate is laminated on the surface of the window film provided with the coloring layer and the adhesive layer, on which the coloring layer and the adhesive layer are formed, so that the TAC side is on the inside, and bonded using a roll bonding machine (fig. 12 (e)). Then, a touch sensor panel 71 was laminated on the surface of the polarizing plate 60d opposite to the window film side via the pressure-sensitive adhesive layer 21 (thickness 25 μm) so that the cycloolefin-based resin film became a surface layer (touch sensor pattern (thickness 10 μm) was disposed on the cycloolefin-based resin film (thickness 23 μm)), and an optical laminate of comparative example 1 was obtained (fig. 12 (f)). In the optical laminate of comparative example 1, the laminate composed of "polarizing plate 60 d/pressure-sensitive adhesive layer 21/touch sensor panel 71" corresponds to back surface plate 30. The distance d1 from the surface of the colored layer 41 on the window film side to the outermost surface of the optical laminate on the window film side was 70 μm. The distance d2 from the surface of the colored layer 41 on the side away from the window film to the outermost surface of the optical laminate on the side of the cycloolefin resin film was 115 μm. The magnitude of the difference is 45 μm, and the magnitude of the relative difference is 24.3% (≈ 100 × | (115-70)/(115+70) |).
< comparative example 2>
An optical laminate was produced in the same manner as in comparative example 1, except that printing was repeated with a discharge amount of 3 μm in coating thickness after drying 2 times using a composition for forming a color layer (black) as ink by screen printing, and printing was repeated with a discharge amount of 5 μm in coating thickness after drying 3 times using a composition for forming a color layer (white) as ink from above the printed layer, thereby forming a white color layer 41 having a thickness of 21 μm and a width of 5mm over the entire circumference of the peripheral portion. The distance D1 is 70 μm, the distance D2 is 106 μm, the difference is 36 μm in size and the relative size D is 20.5% (≈ 100 × | (106-70)/(106+70) |).
[ evaluation test ]
An evaluation test for confirming the durability against bending was performed on the optical laminates of examples 1 to 3 and comparative examples 1 and 2 using a bending evaluation apparatus (STS-VRT-500, manufactured by Science Town, inc.). Fig. 10 is a view schematically showing the method of the evaluation test. As shown in fig. 10, two tables 501 and 502, which can be moved independently, are arranged so that the gap C becomes 2.5mm, and the optical laminate 100 is fixed so that the center in the width direction is positioned at the center of the gap C (fig. 10 (a)). At this time, the optical laminate 100 is disposed so that the window film (front panel 10) is positioned upward. Then, the two tables 501 and 502 are rotated upward by 90 degrees about the positions P1 and P2 as the centers of the rotation axes, and a bending force is applied to the region of the optical layered body 100 corresponding to the gap C of the tables (fig. 10 (b)). Thereafter, the two tables 501 and 502 are returned to their original positions (fig. 10 (a)). The above series of operations was completed, and the number of times of application of the bending force was counted as 1 time. The number of times of application of the bending force was integrated, whether or not cracks occurred in the colored layers in the region of the optical laminate 100 corresponding to the gap C of the mounting tables 501 and 502 was checked, and the bending force was stopped at the time of occurrence of the cracks, and evaluated based on the following criteria. The evaluation results are shown in table 1. The moving speed of the mounting tables 501 and 502 and the application rhythm of the bending force are the same in the evaluation test for any optical laminate.
A: the number of times of application of the bending force reaches 20 ten thousand without generating cracks,
b: cracks are generated when the number of times of application of the bending force is 15 ten thousand or more and less than 20 ten thousand,
c: cracks are generated when the number of times of applying the bending force is 10 ten thousand or more and less than 15 ten thousand,
d: cracks are generated when the number of times of applying the bending force is 5 ten thousand or more and less than 10 ten thousand,
e: cracks were generated when the number of bending forces applied was less than 5 ten thousand.
[ Table 1]
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | |
| Surface on which a colored layer is formed | Polarizing plate | Polarizing plate | Polarizing plate | Window film | Window film |
| Thickness of coloring layer (. mu.m) | 6 | 12 | 21 | 12 | 21 |
| Relative size D (%) | 6.8 | 10.3 | 15.9 | 24.3 | 20.5 |
| Evaluation test | A | B | C | D | E |
(examples 4 and 5)
< preparation of colorant-containing layer-Forming composition (Black color) >
[ ink Components ]
Acetylene black 15% by mass
Polyester 75% by mass
2.5% by mass of dimethyl glutamate
Succinic acid 2% by mass
Isophorone 5.5 mass%
[ curing agent ]
75% by mass of aliphatic polyisocyanate
25% by mass of ethyl acetate
[ solvent ]
Isophorone
[ production method ]
The curing agent 10 parts by mass and the solvent 10 parts by mass were added to 100 parts by mass of the ink components, and the mixture was stirred to obtain a colorant layer-containing composition (black color).
< preparation of composition for Forming protective layer (transparent) >
[ ink Components ]
90% by mass of polyester
Dimethyl glutamate 2.5 mass%
Succinic acid 2% by mass
5.5% by mass of isophorone
[ curing agent ]
75% by mass of aliphatic polyisocyanate
25% by mass of ethyl acetate
[ solvent ]
Isophorone
[ production method ]
The curing agent 10 parts by mass and the solvent 10 parts by mass were added to 100 parts by mass of the ink components, and the mixture was stirred to obtain a composition for forming a protective layer.
< preparation of colorant-containing layer-Forming composition (metallic silver color) >
[ ink Components ]
Aluminum powder (metal pigment) 15 mass%
Polyester 75% by mass
Dimethyl glutamate 2.5 mass%
Succinic acid 2% by mass
Isophorone 5.5 mass%
[ curing agent ]
Aliphatic polyisocyanate 75 mass%
25% by mass of ethyl acetate
[ solvent ]
Isophorone
[ production method ]
The colorant layer-containing composition (metallic silver) was obtained by adding 10 parts by mass of the curing agent and 10 parts by mass of the solvent to 100 parts by mass of the ink components and stirring them.
< preparation of photosensitive resin composition >
[ resin ]
Acrylate Polymer 7% by mass
81% by mass of a methacrylate monomer
[ curing agent ]
1, 6-Hexane diisocyanate 10% by mass
Triphenylphosphine 2% by mass
[ production method ]
The above components were mixed and stirred to obtain a photosensitive resin composition.
< preparation of adhesive sheet >
84 parts by mass of 2-ethylhexyl acrylate, 15 parts by mass of isobornyl acrylate, 1 part by mass of hydroxypropyl acrylate, and 0.02 part by mass of 1-hydroxycyclohexyl phenyl ketone as a polymerization initiator are mixed. The mixed solution is irradiated with ultraviolet rays to polymerize the monomer.
Subsequently, 0.4 part of 1-hydroxycyclohexyl phenyl ketone, 0.3 part of lauryl acrylate, 0.05 part of polyethylene glycol (200) diacrylate and 0.05 part of (3-glycidyloxypropyl) trimethoxysilane were added to the above-mentioned mixture as a polymerization initiator to prepare a pressure-sensitive adhesive composition.
The adhesive composition was coated on a polyethylene terephthalate film (release film) whose surface was treated with silicon. The coating thickness was 25 μm. Another release film was prepared and laminated on the coating film. A laminate comprising a layer of a release film/a coating film of a pressure-sensitive adhesive composition and a release film was irradiated with ultraviolet light. In the ultraviolet irradiation step, the amount of ultraviolet light of 300 to 400nm (maximum light emission intensity at 365 nm) is 1500mJ/cm in cumulative light quantity2The laminate is irradiated with light. Thus, an adhesive sheet having a (meth) acrylic adhesive layer was produced.
< example 4>
(preparation of Window film with adhesive layer)
The optical laminate of example 1 was produced in the order shown in fig. 9. Specifically, a window film having a thickness of 70 μm (50 μm base film, 10 μm hard coat layer, 177mm in length × 105mm in width) having hard coat layers formed on both surfaces of the base film was prepared as the front panel 10 (fig. 9(c)), and the (meth) acrylic pressure-sensitive adhesive layer (having a thickness of 25 μm, 177mm in length × 105mm in width) of the pressure-sensitive adhesive sheet prepared as described above was used as the adhesive layer 20. 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 dendritic polymer compound having a polyfunctional acrylic group at the end. Thereafter, the surface of the window film that is in contact with the adhesive layer and the surface of the adhesive layer that is in contact with the window film are subjected to corona treatment. Then, the window film and the pressure-sensitive adhesive layer are bonded to each other to obtain a window film with a pressure-sensitive adhesive layer (fig. 9 d).
(production of polarizing plate)
After a photo-alignment film was formed on a substrate, a composition containing a dichroic dye and a polymerizable liquid crystal compound was applied to the substrate, and the substrate was aligned and cured to obtain a polarizer having a thickness of 2 μm. A cellulose Triacetate (TAC) film having a thickness of 25 μm was bonded to the polarizer via an adhesive layer. The substrate was peeled off, and a retardation film (thickness: 17 μm, layer structure: protective film layer (cured layer of acrylic resin composition, thickness: 1 μm)/adhesive layer (thickness: 5 μm)/lambda/4 plate (thickness: 3 μm)/adhesive layer (thickness: 5 μm)/positive C plate (thickness: 3 μm) composed of layer formed by curing liquid crystal compound and alignment film) composed of layer formed by polymerizing and curing liquid crystal compound was laminated on the exposed surface. The polarizing plate thus produced (layer composition of "TAC/polarizer/retardation film", thickness 44 μm, longitudinal 177mm × transverse 105mm) was prepared as the back plate 30 (fig. 9 (a)).
(formation of colored layer)
The prepared colorant layer-forming composition (black) was used as an ink on the TAC surface of the polarizing plate, and printing was performed by screen printing using a 460-mesh screen plate to a discharge thickness of 3 μm after drying, thereby forming a black printed layer having a thickness of 3 μm and a width of 5mm in the non-display region.
TiO was deposited on the TAC surface of the polarizer having the black printed layer by using an electron beam deposition apparatus (product name: UNIVAC2050, manufactured by UNIVAC corporation)2Formed as a vapor deposition source
On which In is formed as a deposition source
On which TiO is deposited2Formed as a vapor deposition source
A vapor deposition layer of thickness of (1), on which Al is deposited2O3Formed as a vapor deposition source
The thickness of (3) is as small as possible. Thus, a gold-colored deposition layer (plating layer, thickness < 1 μm) composed of 4 layers was formed in the entire region including the non-display region and the display region. Then, the above-prepared composition for forming a protective layer (transparent) was used as an ink in the non-display region of the surface of the gold-deposited layer for 460 mesh purposesThe screen plate was subjected to screen printing, printing with a discharge amount of 5 μm in coating thickness after drying to form a protective layer, and the gold vapor-deposited layer in the region where the protective layer was not formed (display region) was removed by etching. In this way, in the non-display region, a colored layer 40 (fig. 9(b)) having a layer structure of "black printed layer (thickness 3 μm)/gold evaporated layer (thickness < 1 μm)/protective layer (thickness 5 μm)" (the entire thickness exceeds 8 μm and is less than 9 μm) is formed.
(production of optical laminate)
Thereafter, the surface of the window film with the adhesive layer on which the coloring layer 40 was formed and the surface of the polarizing plate on which the coloring layer 40 was formed were subjected to corona treatment, and the window film with the adhesive layer and the polarizing plate were laminated so that the corona-treated surfaces were located inside, and bonded together using a roll bonder to obtain an optical laminate of example 4 (fig. 9 (e)).
< example 5>
An optical laminate of example 2 was obtained in the same manner as in example 3 except that the colored layer 40 was formed by a thermal transfer method as described below (fig. 9 (e)).
The prepared photosensitive resin composition was applied to the surface of a base film for thermal transfer (a PET film having a thickness of 100 μm) so that the cured thickness became 8 μm, and the applied layer was cured by irradiating ultraviolet rays with an ultraviolet ray irradiation apparatus (product name: UV Pattern Machine, manufactured by JM UV Tech) to form a resin layer.
TiO was deposited on the entire surface of the resin layer on the surface of the base film by using an electron beam deposition apparatus (product name: UNIVAC2050, manufactured by UNIVAC corporation)2Formed as a vapor deposition source
On the deposition layer, In is formed as a deposition source
On the vapor deposition layer of (3), TiO is deposited2Formed as a vapor deposition source
A vapor deposition layer of (2), on which Al is deposited2O3Formed as a vapor deposition source
A vapor deposition layer having a thickness of (1). A gold vapor-deposited layer (plating layer, thickness < 1 μm) composed of 4 layers was thus formed. Then, the prepared colorant layer-containing composition (black) was used as an ink in the region corresponding to the non-display region on the surface of the gold vapor-deposited layer, and a black printed layer (thickness 3 μm) was formed by printing with a screen of 460 mesh after drying to discharge a coating thickness of 3 μm, and the gold vapor-deposited layer in the region where the black printed layer was not formed (region corresponding to the display region) was removed by etching. In this manner, a coloring layer precursor composed of a layer of "gold vapor deposition layer (thickness < 1 μm)/black printing layer (thickness 3 μm)" was formed on the base film for thermal transfer.
The above-prepared composition for forming a protective layer (transparent) was used as an ink on the entire surface of the base film on which the color layer precursor was formed, and printing was performed by screen printing using a 460-mesh screen plate so as to give a coating thickness of 3 μm after drying, thereby forming a protective layer in a half-dried state (functioning as an adhesive layer during thermal transfer). Then, a resin layer containing a color layer precursor was thermally transferred to the TAC surface of the polarizing plate by using a thermal transfer device (product name: 2D transfer equipment, manufactured by Iroomo corporation), and the color layer precursor composed of a layer of "gold vapor deposition layer (thickness < 1 μm)/black printing layer (thickness 3 μm)" was provided on the TAC surface of the polarizing plate as the color layer 40.
[ evaluation test ]
An evaluation test for confirming the durability against bending was performed on the optical laminates of examples 4 and 5 using a bending evaluation apparatus (STS-VRT-500, manufactured by Science Town). Fig. 10 is a view schematically showing the method of the evaluation test. As shown in fig. 10, two tables 501 and 502, which can be moved independently, are arranged so that the gap C becomes 5.0mm (2.5R), and the optical laminate 100 is fixed so that the center in the width direction is positioned at the center of the gap C (fig. 10 a). At this time, the optical laminate 100 is disposed so that the window film (front panel 10) is positioned above. Then, the two tables 501 and 502 are rotated upward by 90 degrees about the positions P1 and P2 as the centers of the rotation axes, and a bending force is applied to a region of the optical laminate 100 corresponding to the gap C between the tables (fig. 10 (b)). Thereafter, the two tables 501 and 502 are returned to their original positions (fig. 10 (a)). The above series of operations was completed, and the number of times of application of the bending force was counted as 1 time. The number of times of application of the bending force was integrated, whether or not cracks occurred in the colored layers in the regions of the optical laminate 100 corresponding to the gaps C of the mounting tables 501 and 502 was checked, and the application of the bending force was stopped when cracks occurred, and evaluated according to the following criteria. The evaluation results are shown in table 1. The moving speed of the mounting tables 501 and 502 and the rhythm of application of bending force are the same in the evaluation test of any optical laminate.
A: even if the number of times of applying the bending force reaches 20 ten thousand, no crack is generated,
b: cracks are generated when the number of times of application of the bending force is 15 ten thousand or more and less than 20 ten thousand,
c: cracks are generated when the number of times of application of the bending force is 10 ten thousand or more and less than 15 ten thousand,
d: cracks are generated when the number of times of applying the bending force is 5 ten thousand or more and less than 10 ten thousand,
e: cracks were generated when the number of bending forces applied was less than 5 ten thousand.
[ Table 2]
Description of the symbols
10 front panel, 20 lamination layer, 30 back panel, 40, 41 coloring layer, 60a, 60B, 60C, 60d polarizing plate, 70 touch sensor panel, 81 liquid crystal display unit, 82 organic EL display unit, 90 backlight unit, 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, 501, 502 mounting table, a display area, B non-display area, C gap.
Claims (16)
1. An optical laminate comprising a front plate, a bonding layer, and a back plate in this order, and further comprising a coloring layer provided on a part of the surface of the back plate on the bonding layer side,
the distance from the surface of the colored layer on the side close to the front panel to the outermost surface of the optical laminate on the side of the front panel is defined as distance D1, the distance from the surface of the colored layer on the side away from the front panel to the outermost surface of the optical laminate on the side of the rear panel is defined as distance D2, the relative size D of the difference between distance D1 and distance D2 is 0 to 20%, and the unit of D is,
D＝100×|(d1－d2)/(d1+d2)|。
2. the optical laminate according to claim 1, wherein the colored layer has a thickness of 3 μm or more.
3. The optical stack according to claim 1 or 2, wherein the front panel is a resin film.
4. The optical stack of claim 1 or 2, wherein the back panel has a polarizer.
5. An image display device comprising the optical laminate according to any one of claims 1 to 4, wherein the front panel is disposed on the front surface.
6. A method for producing the optical laminate according to any one of claims 1 to 4, comprising:
a coloring layer forming step of forming the coloring layer on a part of the outermost layer of the back panel on the bonding layer side; and
and a laminating step of laminating the bonding layer on the outermost layer after the color layer forming step.
7. An optical laminate comprising a front plate, a bonding layer, and a back plate in this order, and further comprising a colored layer provided on a part of the surface of the back plate on the bonding layer side,
the colored layer comprises a plating layer,
the distance from the surface of the colored layer on the side close to the front panel to the outermost surface of the optical laminate on the side of the front panel is defined as distance D1, the distance from the surface of the colored layer on the side away from the front panel to the outermost surface of the optical laminate on the side of the rear panel is defined as distance D2, the relative size D of the difference between distance D1 and distance D2 is 0 to 20%, and the unit of D is,
D＝100×|(d1－d2)/(d1+d2)|。
8. the optical stack according to claim 7,
the colored layer further has a protective layer covering the plating layer.
9. The optical stack according to claim 7 or 8, wherein the colored layer further comprises a base layer covered with the plating layer.
10. The optical stack of claim 9, wherein the base layer comprises a black pigment.
11. The optical laminate according to claim 7 or 8, wherein the colored layer has a thickness of 1 to 30 μm.
12. The optical stack according to claim 7 or 8,
the optical laminate is divided into a display region and a non-display region in a plane direction orthogonal to the lamination direction,
the colored layer is provided in the non-display region,
the optical density of the non-display region is 3 or more.
13. The optical stack according to claim 7 or 8, wherein the front panel is a resin film.
14. The optical stack of claim 7 or 8, wherein the back panel has a polarizer.
15. An image display device comprising the optical laminate according to any one of claims 7 to 14, wherein the front panel is disposed on the front surface.
16. A method of manufacturing the optical laminate according to any one of claims 7 to 14, comprising:
a coloring layer forming step of forming the coloring layer on a part of the outermost layer of the back panel on the bonding layer side; and
and a laminating step of laminating the adhesive layer on the outermost layer after the coloring layer forming step.
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| JP2018-083404 | 2018-04-24 | ||
| JP2018083404 | 2018-04-24 | ||
| JP2018-219445 | 2018-11-22 | ||
| JP2018219445A JP2019188795A (en) | 2018-04-24 | 2018-11-22 | Optical laminate and method for producing the same |
| PCT/JP2019/015116 WO2019208168A1 (en) | 2018-04-24 | 2019-04-05 | Optical layered body and method for producing same |
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| CN112041712B true CN112041712B (en) | 2022-07-22 |
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| JP (1) | JP2019188795A (en) |
| KR (1) | KR20210005064A (en) |
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| JP6792736B1 (en) * | 2019-11-20 | 2020-11-25 | 住友化学株式会社 | Optical laminate and display device |
| CN115171534B (en) * | 2022-07-12 | 2024-02-02 | 武汉华星光电半导体显示技术有限公司 | Display module and display device |
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|---|---|---|---|---|
| JP2007264039A (en) * | 2006-03-27 | 2007-10-11 | Sharp Corp | Transparent member for external light reflection prevention and vehicle |
| JP2008083263A (en) * | 2006-09-26 | 2008-04-10 | Nissha Printing Co Ltd | Protective plate for portable display device |
| CN102834748A (en) * | 2010-03-31 | 2012-12-19 | 住友化学株式会社 | Polarizing layered film, polarizing plate and method for producing the same |
| JP2013086466A (en) * | 2011-10-21 | 2013-05-13 | Asahi Glass Co Ltd | Front plate and method of manufacturing the same |
| CN104025169A (en) * | 2011-10-20 | 2014-09-03 | 日本写真印刷株式会社 | Decorative film for display device and protective panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007264038A (en) * | 2006-03-27 | 2007-10-11 | Sharp Corp | Transparent member for external light reflection prevention and vehicle |
| JP6310647B2 (en) | 2013-06-10 | 2018-04-11 | 日東電工株式会社 | Optical member and image display device |
| JP6471406B2 (en) * | 2013-12-18 | 2019-02-20 | 大日本印刷株式会社 | Optical laminate |
| JP2017021527A (en) * | 2015-07-09 | 2017-01-26 | 積水化学工業株式会社 | Interlayer filling material kit for touch panel, laminate, and method for manufacturing laminate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007264039A (en) * | 2006-03-27 | 2007-10-11 | Sharp Corp | Transparent member for external light reflection prevention and vehicle |
| JP2008083263A (en) * | 2006-09-26 | 2008-04-10 | Nissha Printing Co Ltd | Protective plate for portable display device |
| CN102834748A (en) * | 2010-03-31 | 2012-12-19 | 住友化学株式会社 | Polarizing layered film, polarizing plate and method for producing the same |
| CN104025169A (en) * | 2011-10-20 | 2014-09-03 | 日本写真印刷株式会社 | Decorative film for display device and protective panel |
| JP2013086466A (en) * | 2011-10-21 | 2013-05-13 | Asahi Glass Co Ltd | Front plate and method of manufacturing the same |
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| CN112041712A (en) | 2020-12-04 |
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