WO2023085318A1 - 光学積層体および画像表示装置 - Google Patents

光学積層体および画像表示装置 Download PDF

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Publication number
WO2023085318A1
WO2023085318A1 PCT/JP2022/041721 JP2022041721W WO2023085318A1 WO 2023085318 A1 WO2023085318 A1 WO 2023085318A1 JP 2022041721 W JP2022041721 W JP 2022041721W WO 2023085318 A1 WO2023085318 A1 WO 2023085318A1
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WIPO (PCT)
Prior art keywords
polarizing plate
layer
display device
image display
meth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/041721
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English (en)
French (fr)
Japanese (ja)
Inventor
敬治 永幡
亮 河村
章典 伊▲崎▼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
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Nitto Denko Corp
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Publication date
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Priority to CN202280074069.1A priority Critical patent/CN118202280A/zh
Priority to KR1020247015841A priority patent/KR20240113468A/ko
Priority to JP2023559865A priority patent/JPWO2023085318A1/ja
Publication of WO2023085318A1 publication Critical patent/WO2023085318A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional [2D] radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional [2D] radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • 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
    • H10K59/10—OLED displays
    • 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
    • H10K59/80—Constructional details
    • H10K59/8793—Arrangements for polarized light emission
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • 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

Definitions

  • the present invention relates to an optical laminate and an image display device.
  • the difference in appearance between the display area (black screen) and the non-display area (colored portion) is conspicuous when the display is not displayed (when the power is turned off). In some cases, improvements are required from the viewpoint of designability.
  • Patent Document 1 proposes a display body that reduces the color difference between the display area and the non-display area when not displaying, but there is a demand for further improvement.
  • the present invention has been made to solve the above problems, and its main object is to provide an image display device in which a colored portion is provided along the outer periphery of the display screen, and a display area and a display area when not displaying. To provide an image display device in which the difference in appearance from a non-display area is difficult to recognize.
  • the first polarizing plate and the second polarizing plate each including a polarizer are laminated such that the absorption axis directions of the polarizers are substantially parallel to each other.
  • An optical layered body is provided, wherein a printed layer is provided along the outer peripheral portion of the surface of the first polarizing plate on which the second polarizing plate is arranged.
  • the total light transmission of the optical stack is greater than 35.0%.
  • the printing layer has a thickness of 3 ⁇ m to 30 ⁇ m.
  • the first polarizing plate and the second polarizing plate are attached via an adhesive layer.
  • a surface base material layer is laminated on the side of the first polarizing plate opposite to the side on which the second polarizing plate is arranged. In one embodiment, a surface base material layer is laminated on the side of the second polarizing plate opposite to the side on which the first polarizing plate is arranged.
  • an image display device including a display element and the optical layered body in this order toward the viewing side.
  • the SCI method L*a*b* color difference (CIE 1976 ) is less than 1.5.
  • the reflectance by the SCI method of the portion provided with the printed layer when viewed from the viewing side when not displaying is 2.5% or less.
  • the display element comprises a liquid crystal cell, an organic electronic element or an inorganic electronic element. In one embodiment, the display element further includes a touch panel.
  • the image display device has a configuration in which two polarizers are coaxially laminated on the viewing side of a display element, and a printed layer is arranged between them.
  • FIG. 1 is a schematic cross-sectional view of an optical stack according to one embodiment of the invention
  • FIG. 1 is a schematic cross-sectional view of an optical stack according to one embodiment of the invention
  • FIG. 1 is a schematic cross-sectional view of an image display device according to one embodiment of the present invention
  • FIG. 1 is a schematic cross-sectional view of an image display device according to one embodiment of the present invention
  • FIG. 1 is a schematic cross-sectional view of an image display device according to one embodiment of the present invention
  • FIG. 1 is a schematic cross-sectional view of an image display device according to one embodiment of the present invention
  • a first polarizing plate and a second polarizing plate each including a polarizer are arranged such that the absorption axis directions of the polarizers are substantially parallel to each other. It has a configuration in which a printed layer is provided along the outer peripheral portion of the surface of the first polarizing plate on which the second polarizing plate is arranged.
  • the optical layered body is preferably used for producing an image display device, and is arranged on the viewing side of a display element such as an organic electroluminescence (EL) element, an inorganic EL element, or a liquid crystal cell.
  • a display element such as an organic electroluminescence (EL) element, an inorganic EL element, or a liquid crystal cell.
  • FIG. 1A is a schematic cross-sectional view (a) and a schematic top view (b) of an optical layered body according to one embodiment of the present invention.
  • the first polarizing plate 10 including the first polarizer 12 and the second polarizing plate 20 including the second polarizer 22 They are laminated so that the absorption axis directions are substantially parallel to each other.
  • a print layer 30 is provided along the outer periphery of the surface of the first polarizing plate 10 on which the second polarizing plate 20 is arranged. As shown in FIG.
  • the printed layer 30 is provided in a frame shape along the outer periphery on the main surface of the first polarizing plate 10 on the side of the second polarizing plate 20, and optically
  • the portion where the print layer 30 is not provided becomes the display area A
  • the print A non-display area B is a portion where the layer 30 is provided.
  • the first polarizing plate 10 and the second polarizing plate 20 are bonded together with the adhesive layer 40 interposed therebetween.
  • a configuration in which they are simply laminated without interposing an adhesive layer such as an adhesive layer may be used.
  • the term “substantially parallel” includes a range in which the angle formed by two directions is 0° ⁇ 10°, preferably 0° ⁇ 5°, more preferably 0° ⁇ 3°. encompassing the range of
  • FIG. 1B and 1C are schematic cross-sectional views of optical laminates according to one embodiment of the present invention, respectively.
  • the surface base layer 50 is laminated on the opposite side of the first polarizing plate 10 to the side where the second polarizing plate 20 is arranged.
  • the surface base material layer 50 is a layer that can function as a front plate of an image display device. can be arranged on the viewing side of the display element such that the .
  • the surface base material layer 50 is laminated on the side of the second polarizing plate 20 opposite to the side on which the first polarizing plate 10 is arranged.
  • the surface base material layer 50 is a layer that can function as a front plate of an image display device. It can be arranged on the viewing side of the display element so as to be closer to the viewing side than the polarizing plate 10 .
  • the optical layered body may further include an adhesive layer for bonding to an adjacent member such as a display element.
  • an adhesive layer for bonding to an adjacent member such as a display element.
  • one or both surfaces of the optical layered body 100a, the surface of the optical layered body 100b facing the second polarizing plate 20, or the surface of the optical layered body 100c facing the first polarizing plate 10 has a pressure-sensitive adhesive layer. may be provided. These pressure-sensitive adhesive layers arranged as the outermost layers of the optical laminate may be protected with a release liner until they are used.
  • optical layered body is not limited to the configuration of the illustrated example.
  • each embodiment can be combined as appropriate.
  • the optical layered body may further have any appropriate component depending on the purpose.
  • Such components include, for example, a retardation layer and a surface protection film.
  • Each component may be laminated via any appropriate adhesive layer (adhesive layer, adhesive layer, etc.) as necessary.
  • the total light transmittance of the display area of the optical laminate is, for example, over 35.0%, preferably 39.0% to 42.5%, more preferably 42.5% to 45%.
  • the reflectance (SCI method) of the non-display area of the optical laminate is, for example, 10% or less or less than 10%, preferably 1.0% to 10%, more preferably 1.0% to 5.0%.
  • the reflectance (SCI method) of the display area is, for example, 10% or less or less than 10%, preferably 1.0% to 10%, more preferably 1.0% to 5.0%.
  • the optical laminate includes a surface substrate layer (for example, a surface substrate layer having an antireflection layer)
  • the reflectance (SCI method) of the non-display area of the optical laminate is, for example, less than 2.5%, preferably may be between 0.5% and 2.0%, more preferably between 0.5% and 1.0%.
  • the reflectivity of the display area (SCI method) can be, for example, less than 2.5%, preferably 0.5% to 2.0%, more preferably 0.5% to 1.0%.
  • the reflectance (SCE method) of the non-display area of the optical laminate is, for example, less than 1.5%, preferably 0.1% to 1.0%, more preferably 0.1% to 0.5%.
  • the reflectance of the display area (SCE method) is, for example, less than 1.5%, preferably 0.1% to 1.0%, more preferably 0.1% to 0.5%.
  • the thickness of the optical layered body is, for example, 100 ⁇ m to 4000 ⁇ m, preferably 200 ⁇ m to 2000 ⁇ m.
  • first Polarizing Plate and the second polarizing plate includes a polarizer, and typically further includes a protective layer provided on one or both sides of the polarizer.
  • the first polarizing plate and the second polarizing plate may have the same configuration or may have different configurations.
  • the polarizers and protective layers that may be included in the first polarizing plate and the second polarizing plate the following description applies similarly unless otherwise specified.
  • the surface base material layer that can function as the front plate may have a size one size larger than the other components, but when the first polarizing plate is arranged on the viewing side than the second polarizing plate , the first polarizing plate may be formed to have the same size as the surface substrate layer.
  • Polarizer A polarizer is typically composed of a polyvinyl alcohol-based resin film containing a dichroic substance (eg, iodine).
  • the polarizer may be composed of a single-layer resin film, or may be manufactured using a laminate of two or more layers.
  • the polarizer composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene/vinyl acetate copolymer films.
  • hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene/vinyl acetate copolymer films.
  • polyene-based oriented films such as those subjected to dyeing treatment and stretching treatment with dichroic substances such as iodine and dichroic dyes, and dehydrated PVA and dehydrochlorinated polyvinyl chloride films.
  • a polarizer obtained by dyeing a PVA-based film with iodine and uniaxially stretching the film is preferably used because of its excellent optical properties.
  • the dyeing with iodine is performed, for example, by immersing the PVA-based film in an aqueous iodine solution.
  • the draw ratio of the uniaxial drawing is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment, or may be performed while dyeing. Moreover, you may dye after extending
  • the polarizer obtained using a laminate include a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a resin substrate and the resin
  • a polarizer obtained by using a laminate with a PVA-based resin layer formed by coating on a substrate can be mentioned.
  • a polarizer obtained by using a laminate of a resin base material and a PVA-based resin layer formed by coating on the resin base material is obtained, for example, by applying a PVA-based resin solution to the resin base material and drying the resin base material.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching. Furthermore, stretching may further include stretching the laminate in air at a high temperature (eg, 95° C. or higher) before stretching in an aqueous boric acid solution, if necessary.
  • the obtained resin substrate/polarizer laminate may be used as it is (that is, the resin substrate may be used as a protective layer for the polarizer), or the resin substrate may be peeled off from the resin substrate/polarizer laminate.
  • any appropriate protective layer may be laminated on the release surface according to the purpose. Details of a method for manufacturing such a polarizer are described, for example, in Japanese Patent Application Laid-Open No. 2012-73580. The publication is incorporated herein by reference in its entirety.
  • the thickness of the polarizer is, for example, 30 ⁇ m or less, preferably 15 ⁇ m or less, more preferably 1 ⁇ m to 12 ⁇ m, still more preferably 2 ⁇ m to 10 ⁇ m, still more preferably 2 ⁇ m to 8 ⁇ m.
  • the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the single transmittance of the polarizer is, for example, 41.0% or more, preferably 43.0% to 46.0%, and more preferably 44.5% to 46.0%.
  • the degree of polarization of the polarizer is preferably 97.0% or higher, more preferably 99.0% or higher, still more preferably 99.9% or higher.
  • the protective layer is composed of any suitable film that can be used as a protective layer for a polarizer.
  • materials that are the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyesters, polyvinyl alcohols, polycarbonates, polyamides, polyimides, polyethersulfones, and polysulfones.
  • TAC triacetyl cellulose
  • polyesters polyvinyl alcohols
  • polycarbonates polyamides
  • polyimides polyethersulfones
  • polysulfones polysulfones.
  • Thermosetting resins such as (meth)acrylic, urethane, (meth)acrylic urethane, epoxy, and silicone, or ultraviolet curable resins may also be used.
  • a glassy polymer such as a siloxane-based polymer can also be used.
  • polymer films described in JP-A-2001-343529 can also be used. Materials for this film include, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in a side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in a side chain.
  • the polymer film can be, for example, an extrudate of the resin composition.
  • the protective layer (outer protective layer) disposed on the side opposite to the display element typically has a thickness of 300 ⁇ m or less, preferably 100 ⁇ m or less, and more preferably 5 ⁇ m. ⁇ 80 ⁇ m, more preferably 10 ⁇ m to 60 ⁇ m.
  • the thickness of the outer protective layer is the thickness including the thickness of the surface treatment layer.
  • the thickness of the protective layer (inner protective layer) disposed on the display element side when the polarizing plate is applied to an image display device is preferably 5 ⁇ m to 200 ⁇ m, more preferably 10 ⁇ m to 100 ⁇ m, and still more preferably 10 ⁇ m to 60 ⁇ m. .
  • the inner protective layer is optically isotropic.
  • “optically isotropic” means that the in-plane retardation Re (550) of the retardation layer is 0 nm to 10 nm, and the thickness direction retardation Rth (550) is ⁇ 10 nm to +10 nm. It means that in another embodiment, the inner protective layer (typically the inner protective layer of the polarizer placed on the display element side) is optically anisotropic and has any suitable retardation value. It is a retardation layer.
  • the in-plane retardation Re(550) of the retardation layer is, for example, 120 nm to 160 nm, preferably 135 nm to 155 nm.
  • the inner protective layer is a ⁇ / 4 plate
  • the angle formed by the slow axis direction and the absorption axis direction of the polarizer is, for example, 45 ° ⁇ 10 °, preferably 45 ° ⁇ 5 °, more preferably A circularly polarizing plate can be obtained by arranging them at an angle of 45°.
  • nx is the refractive index in the direction in which the in-plane refractive index is maximized (that is, the slow axis direction)
  • ny is the in-plane direction orthogonal to the slow axis (that is, the fast is the refractive index in the axial direction)
  • 'nz' is the refractive index in the thickness direction
  • 'd' is the layer (film) thickness (nm).
  • the printed layer is a colored layer colored by printing according to the application and desired design.
  • the printed layer may be a design layer having a predetermined design, or may be a solid colored layer.
  • the printed layer is preferably a solid colored layer, and more preferably dark colors such as black, blue, navy blue, purple, and brown (for example, L* in the SCI system L*a*b* color space is 50 or less, a* value of +10 to ⁇ 10 and b* value of +10 to ⁇ 10), more preferably black (for example, L* in L*a*b* color space of SCI system is 20 or less). , an a* value of +5 to ⁇ 5 and a b* value of +5 to ⁇ 5).
  • the wiring, terminals, backlight, and other parts can be suitably hidden in the non-display area.
  • the printed layer can be formed in any suitable pattern according to the purpose.
  • the printed layer is formed on the main surface of the polarizing plate in a frame-like shape along the outer periphery thereof, and can be formed, for example, at a position corresponding to the bezel. With such a configuration, the non-display area can be hidden without using a bezel.
  • the printed layer can be formed by any appropriate printing method using the printed layer forming composition. Specific examples of printing methods include gravure printing, offset printing, silk screen printing, and transfer printing from a transfer sheet.
  • the print layer-forming composition typically contains a binder, a coloring material, a solvent, and any appropriate additive that can be used as necessary.
  • Binders include chlorinated polyolefins (eg, chlorinated polyethylene, chlorinated polypropylene), polyester resins, urethane resins, acrylic resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, and cellulose resins. . Binder resin may be used independently and may use 2 or more types together.
  • the binder resin is a thermopolymerizable resin. Since the thermal polymerizable resin can be used in a smaller amount than the photopolymerizable resin, it is possible to increase the amount of the colorant used (colorant content in the colored layer).
  • the binder resin is a (meth)acrylic resin, preferably a (meth)acrylic resin containing a polyfunctional monomer (eg, pentaerythritol tri(meth)acrylate) as a copolymerization component.
  • a polyfunctional monomer eg, pentaerythritol tri(meth)acrylate
  • a print layer having an appropriate elastic modulus can be formed.
  • a step is also formed due to the thickness of the printed layer, and the step can effectively function to prevent blocking.
  • the coloring material may be a pigment or a dye, preferably a pigment.
  • Specific examples of the coloring material include inorganic pigments such as titanium white, zinc white, carbon black, iron black, red iron oxide, chrome vermilion, ultramarine blue, cobalt blue, yellow lead, titanium yellow; phthalocyanine blue, indanthrene blue, iso Organic pigments or dyes such as indolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, aniline black; metal pigments consisting of scale-like foils such as aluminum and brass; scales such as titanium dioxide-coated mica and basic lead carbonate Pearl luster pigments (pearl pigments) consisting of shaped foil pieces can be mentioned.
  • inorganic pigments such as titanium white, zinc white, carbon black, iron black, red iron oxide, chrome vermilion, ultramarine blue, cobalt blue, yellow lead, titanium yellow
  • phthalocyanine blue, indanthrene blue iso Organic pigments or dyes such as indolin
  • carbon black, iron black, and aniline black are preferably used.
  • a coloring material it is preferable to use a coloring material together. This is because it can absorb visible light in a wide range and evenly, and can form a colorless (that is, pitch black) colored layer.
  • an azo compound and/or a quinone compound may be used in addition to the coloring materials described above.
  • the colorant contains carbon black as a main component and another colorant (eg, an azo compound and/or a quinone compound). According to such a configuration, it is possible to form a colored layer that is free from coloring and has excellent stability over time.
  • the coloring material When forming a black colored layer, the coloring material may be used in a proportion of preferably 50 to 200 parts by weight with respect to 100 parts by weight of the binder resin. In this case, the content of carbon black in the coloring material is preferably 80% to 100%.
  • a coloring material especially carbon black
  • a colored layer having a very low total light transmittance and excellent stability over time can be formed.
  • the total light transmittance of the printed layer is preferably 0.01% or less, more preferably 0.008% or less. If the total light transmittance is within such a range, the non-display area of the image display device can be satisfactorily concealed.
  • the thickness of the printed layer is, for example, 3 ⁇ m to 30 ⁇ m, preferably 5 ⁇ m to 20 ⁇ m, more preferably 10 ⁇ m to 15 ⁇ m. If the thickness of the printed layer is within this range, the seamless effect between the display area and the non-display area can be preferably obtained.
  • Adhesive layer The adhesive composition forming the adhesive layer used for bonding the first polarizing plate and the second polarizing plate and for bonding any other component is suitable for optical applications. Any suitable adhesive composition possible can be used.
  • the total light transmittance of the adhesive layer is preferably 85% or higher, more preferably 88% or higher. Also, the haze of the adhesive layer is preferably 1.0% or less, more preferably 0.8% or less.
  • any appropriate adhesive composition can be used as the adhesive composition.
  • the adhesive composition examples thereof include rubber-based, acrylic-based, silicone-based, urethane-based, vinyl alkyl ether-based, polyvinyl alcohol-based, polyvinylpyrrolidone-based, polyacrylamide-based, and cellulose-based adhesive compositions.
  • an acrylic pressure-sensitive adhesive composition is preferably used because of its excellent optical transparency, adhesive properties, weather resistance, heat resistance, and the like.
  • the acrylic pressure-sensitive adhesive composition contains, as a base polymer, a partial polymer of a monomer component containing an alkyl (meth)acrylate and/or a (meth)acrylic polymer obtained from the monomer component.
  • alkyl (meth)acrylates examples include those having a linear or branched alkyl group having 1 to 24 carbon atoms at the ester end.
  • Alkyl (meth)acrylate can be used individually by 1 type or in combination of 2 or more types.
  • “(meth)acrylate” means acrylate and/or methacrylate.
  • alkyl (meth)acrylates examples include branched alkyl (meth)acrylates having 4 to 9 carbon atoms.
  • the alkyl (meth)acrylate is preferable in that the adhesive properties are easily balanced. Specifically, n-butyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, isobutyl (meth)acrylate, n-pentyl (meth)acrylate, isopentyl (meth)acrylate, isohexyl (meth) acrylate, isoheptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, etc., and these may be used alone or in combination of two or more. be able to.
  • the alkyl (meth)acrylate having an alkyl group having 1 to 24 carbon atoms at the ester end is preferably 40% by weight or more with respect to the total amount of the monofunctional monomer component forming the (meth)acrylic polymer, 50% by weight or more is more preferable, and 60% by weight or more is even more preferable.
  • the monomer component includes, as a monofunctional monomer component, a copolymerizable monomer other than the alkyl (meth)acrylate (e.g., carboxyl group-containing monomer, hydroxyl group-containing monomer, amide group-containing monomer, aromatic ring-containing (meth)acrylate, etc.). ).
  • a copolymerizable monomer can be used as the remainder of the alkyl (meth)acrylate in the monomer component.
  • copolymerization monomer and the amount used thereof are described in paragraphs 0029 to 0042 of JP-A-2016-157077 and the amount thereof used, or paragraphs 0022-0036 of JP-A-2016-190996. of copolymerized monomers and amounts used thereof can be applied.
  • the monomer component forming the (meth)acrylic polymer may optionally contain a polyfunctional monomer in order to adjust the cohesive force of the pressure-sensitive adhesive.
  • Polyfunctional monomers are monomers having at least two polymerizable functional groups having unsaturated double bonds such as (meth)acryloyl groups or vinyl groups, for example, (poly)ethylene glycol di(meth)acrylate, (Poly)propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, 1,2-ethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,12-dodecanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, etc.
  • Ester compounds of polyhydric alcohol and (meth)acrylic acid allyl (meth)acrylate, vinyl (meth)acrylate, divinylbenzene, epoxy acrylate, polyester acrylate, urethane acrylate, butyl di(meth)acrylate, hexyl di(meth)acrylate, etc. is mentioned.
  • trimethylolpropane tri(meth)acrylate, hexanediol di(meth)acrylate, and dipentaerythritol hexa(meth)acrylate can be preferably used.
  • a polyfunctional monomer can be used individually by 1 type or in combination of 2 or more types.
  • the amount of the polyfunctional monomer used varies depending on its molecular weight, the number of functional groups, etc., but it is preferably used in an amount of 3 parts by weight or less, more preferably 2 parts by weight or less, with respect to a total of 100 parts by weight of the monofunctional monomers. 1 part by weight or less is more preferable. Although the lower limit is not particularly limited, it is preferably 0 parts by weight or more, more preferably 0.001 parts by weight or more. By setting the amount of the polyfunctional monomer to be used within the above range, the adhesive strength can be improved.
  • the weight average molecular weight of the (meth)acrylic polymer is, for example, 1 million to 2.5 million, preferably 1.2 million to 2 million. Further, the molecular weight distribution (weight average molecular weight (Mw)/number average molecular weight (Mn)) is preferably 1.8 or more and 10 or less, more preferably 1.8 to 7, 1.8 to 5 is more preferable.
  • the weight average molecular weight and molecular weight distribution (Mw/Mn) are measured by GPC (gel permeation chromatography) and obtained from values calculated by polystyrene conversion.
  • the (meth)acrylic polymer can be produced by any appropriate method.
  • radical polymerization methods such as solution polymerization, radiation polymerization such as ultraviolet (UV) polymerization, bulk polymerization, and emulsion polymerization can be appropriately selected.
  • the radical polymerization initiator various known azo-based and peroxide-based initiators can be used.
  • the reaction temperature is generally about 50-80° C., and the reaction time is 1-8 hours.
  • the solution polymerization method is preferable, and ethyl acetate, toluene, etc. are generally used as the solvent for the (meth)acrylic polymer.
  • the solution concentration is usually about 20 to 80% by weight.
  • the (meth)acrylic polymer to be obtained may be any of random copolymers, block copolymers, graft copolymers, and the like.
  • the above pressure-sensitive adhesive composition can contain a cross-linking agent.
  • cross-linking agents include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, silicone-based cross-linking agents, oxazoline-based cross-linking agents, aziridine-based cross-linking agents, silane-based cross-linking agents, alkyl-etherified melamine-based cross-linking agents, metal chelate-based cross-linking agents, oxides and the like.
  • the cross-linking agents can be used singly or in combination of two or more. Among these, isocyanate-based cross-linking agents are preferably used.
  • the mixing ratio of the (meth)acrylic polymer and the cross-linking agent is usually about 0.001 to 20 parts by weight of the cross-linking agent (solid content) per 100 parts by weight of the (meth)acrylic polymer (solid content). is preferred, and about 0.01 to 15 parts by weight is more preferred.
  • the above-mentioned pressure-sensitive adhesive composition may optionally include an ultraviolet absorber; a tackifier such as a rosin derivative resin, a polyterpene resin, a petroleum resin, and an oil-soluble phenol resin; a plasticizer; a filler such as a hollow glass balloon; antioxidants; anti-aging agents; silane coupling agents, and other various additives.
  • the amount of additive used can be appropriately set according to the purpose.
  • the amount of the silane coupling agent used is preferably 1 part by weight or less, more preferably 0.01 part by weight to 100 parts by weight of the monofunctional monomer component forming the (meth)acrylic polymer. 1 part by weight, more preferably 0.02 to 0.6 parts by weight.
  • the above pressure-sensitive adhesive composition is preferably adjusted to a viscosity suitable for application work. Viscosity can be adjusted by adding a thickening polymer, a polyfunctional monomer, or the like, by partially polymerizing the monomer component in the pressure-sensitive adhesive composition, or the like. The partial polymerization may be performed before the addition of the viscosity-increasing polymer, the polyfunctional monomer, or the like, or may be performed after the addition.
  • the viscosity of the pressure-sensitive adhesive composition may vary depending on the composition of the monomer components, the types and amounts of additives, etc., it is difficult to unambiguously determine a preferable polymerization rate for partial polymerization, but the polymerization rate is For example, it can be about 20% or less, preferably about 3% to 20%, more preferably about 5% to 15%. If the polymerization rate in the partial polymerization exceeds 20%, the viscosity becomes too high, making it difficult to apply to the substrate.
  • the pressure-sensitive adhesive layer is formed by applying the above-described pressure-sensitive adhesive composition to various substrates and, if necessary, drying and irradiating with radiation.
  • the pressure-sensitive adhesive layer can be transferred from the release film onto a desired member for use.
  • the thickness (thickness in the display area) of the adhesive layer used for bonding the first polarizing plate and the second polarizing plate is, for example, 50 ⁇ m to 1000 ⁇ m, preferably 200 ⁇ m to 750 ⁇ m, more preferably 250 ⁇ m to 500 ⁇ m. .
  • the thickness of the pressure-sensitive adhesive layer used for laminating any other component may be, for example, 1 ⁇ m to 300 ⁇ m, preferably 5 ⁇ m to 100 ⁇ m, more preferably 10 ⁇ m to 50 ⁇ m.
  • the surface base material layer can function as a front plate of an image display device. Therefore, preferably, the surface base material layer is arranged at a position that becomes the outermost surface when the optical layered body is arranged on the viewing side of the display element.
  • the surface substrate layer includes a substrate film and, if necessary, may further include functional layers such as an antireflection layer, an antifouling layer, and a hard coat layer.
  • the surface substrate layer preferably includes an antireflection layer.
  • the antireflection layer for example, a thin layer type that prevents reflection by utilizing the effect of canceling reflected light due to the interference of light as disclosed in JP-A-2005-248173, JP-A-2011-2759.
  • the functional layer can be used singly or in combination of two or more.
  • the functional layer may be laminated on the base film via an adhesive layer (e.g., pressure-sensitive adhesive layer, adhesive layer) while being formed on the support film as necessary, or may be laminated without the adhesive layer. It may be formed directly on the base film.
  • a glass film or a resin film can be used as the base film.
  • glass that constitutes a glass film examples include soda-lime glass, boric acid glass, aluminosilicate glass, and quartz glass according to the classification by composition. Further, according to the classification by alkali component, for example, non-alkali glass and low-alkali glass can be mentioned.
  • the thickness of the glass film is preferably 100 ⁇ m to 2000 ⁇ m, more preferably 200 ⁇ m to 1000 ⁇ m.
  • Resins constituting resin films include polyethylene terephthalate-based resins, polyethylene naphthalate-based resins, acetate-based resins, polyethersulfone-based resins, polycarbonate-based resins, polyamide-based resins, polyimide-based resins, polyamide-imide-based resins, and polyolefin-based resins. , (meth)acrylic resins, polyvinyl chloride resins, polyvinylidene chloride resins, polystyrene resins, polyvinyl alcohol resins, polyarylate resins, polyphenylene sulfide resins, and the like.
  • polyamide-based resins preferred are polyamide-based resins, polyimide-based resins, polyamideimide-based resins, polyethylene naphthalate-based resins, and polycarbonate-based resins, and more preferred are polyimide-based resins. These resins may be used alone or in combination of two or more.
  • the thickness of the resin film is preferably 100 ⁇ m to 2000 ⁇ m, more preferably 200 ⁇ m to 1000 ⁇ m.
  • the release liner is, for example, a plastic (e.g., polyethylene terephthalate (PET), polyethylene, polypropylene) film surface-coated with a release agent such as a silicone-based release agent, a fluorine-based release agent, or a long-chain alkyl acrylate-based release agent. , non-woven fabric or paper.
  • a release agent such as a silicone-based release agent, a fluorine-based release agent, or a long-chain alkyl acrylate-based release agent.
  • the thickness of the release liner is, for example, 10 ⁇ m to 100 ⁇ m.
  • the surface protective film includes a substrate and an adhesive layer provided on one side of the substrate.
  • the surface protective film is provided to prevent the surface of the optical layered body (for example, the surface of the surface substrate layer) from being scratched or soiled, and is usually peeled off before use.
  • a retardation layer that functions as a ⁇ /4 plate is preferably used as the retardation layer.
  • a retardation layer functioning as a ⁇ /4 plate has an in-plane retardation Re(550) of, for example, 120 nm to 160 nm, preferably 135 nm to 155 nm.
  • the retardation layer functioning as a ⁇ / 4 plate, the slow axis direction and the absorption axis direction of the polarizing plate (polarizer), for example 45 ° ⁇ 10 °, preferably 45 ° ⁇ 5 °, more preferably 45 can be arranged at an angle of °.
  • a retardation layer functioning as a ⁇ /2 plate may be arranged between the polarizing plate and the retardation layer functioning as a ⁇ /4 plate.
  • the angle formed by the absorption axis of the polarizing plate (polarizer) and the slow axis of the ⁇ /4 plate is preferably 65° to 85°, more preferably 72° to 78°, further preferably is approximately 75°.
  • the angle formed by the absorption axis of the polarizing plate (polarizer) and the slow axis of the ⁇ /2 plate is preferably 10° to 20°, more preferably 13° to 17°, more preferably about 15 °.
  • a retardation layer functioning as a ⁇ /2 plate has an in-plane retardation Re(550) of, for example, 210 nm to 280 nm, preferably 230 nm to 240 nm.
  • the retardation layer is typically arranged on the display element side of the polarizing plate arranged on the display element side, and the axial relationship with the polarizing plate is as described above.
  • An image display device includes a display element and the optical layered body described in section A in this order toward the viewing side.
  • an image display device includes a display element, a second polarizing plate, a printed layer, and a first polarizing plate in this order toward the viewing side, and the printed layer is the first
  • the first polarizing plate and the second polarizing plate are provided along the outer peripheral portion on the surface of the polarizing plate on which the second polarizing plate is arranged, and the absorption axis direction of each polarizer of the first polarizing plate and the second polarizing plate is arranged substantially parallel to each other.
  • an image display device in another embodiment, includes a display element, a first polarizing plate, a printed layer, and a second polarizing plate in this order toward the viewing side, and the printed layer is the first
  • the first polarizing plate and the second polarizing plate are provided along the outer peripheral portion on the surface of the polarizing plate on which the second polarizing plate is arranged, and the absorption axis direction of each polarizer of the first polarizing plate and the second polarizing plate is arranged substantially parallel to each other.
  • the image display device having such a configuration has a display area (an area in which the printed layer is not provided in a plan view) and a non-display area (an area in which the printed layer is provided in the plan view) on the display screen when not displaying. Since the difference in appearance is small, it can be excellent in design. In addition, since the transmittance of the optical layered body itself is high, a decrease in luminance is suppressed.
  • L* is preferably 15 or less, more preferably 10 or less
  • a* is preferably ⁇ 10 to +10, It is more preferably -5 to +5, and b* is preferably -10 to +10, more preferably -5 to +5.
  • L*a*b* color space of the display area on the display screen when not displaying L* is preferably 10 or less, more preferably 5 or less, and a* is preferably ⁇ 10 to +10. , more preferably -5 to +5, and b* is preferably -10 to +10, more preferably -5 to +5.
  • the SCI method L*a*b* color difference (CIE 1976) ⁇ E*ab between the display area and the non-display area on the display screen when not displaying is preferably less than 1.5, more preferably 1.4 or less. , more preferably 1.3 or less, still more preferably 1.2 or less.
  • the SCE L*a*b* color difference (CIE 1976) ⁇ E*ab is preferably less than 4.0, more preferably 2.5 or less, still more preferably 1.5 or less. If ⁇ E*ab is within the above range, it is difficult to recognize the difference in appearance between the display area and the non-display area on the display screen during non-display.
  • L*a*b* color difference (CIE 1976) ⁇ E*ab is a value calculated by the following formula (where L* is lightness, a* is chromaticity a*, b* is chromaticity b * represents).
  • ⁇ E*ab [( ⁇ L*) 2 +( ⁇ a*) 2 +( ⁇ b*) 2 ] 1/2
  • the reflectance of the SCI method in the display area of the display screen when not displaying is preferably less than 2.5%, more preferably 2.0% or less, and even more preferably 1.5% or less.
  • the reflectance in the non-display area is preferably 2.5% or less, more preferably 2.0% or less, and even more preferably 1.5% or less.
  • the difference in reflectance between the two regions is preferably 0.3% or less, more preferably 0.15% or less.
  • the reflectance of the SCE system in the display area of the display screen during non-display is preferably 1.0% or less, more preferably 0.5% or less, and even more preferably 0.3% or less.
  • the reflectance in the non-display area is preferably 1.0% or less, more preferably 0.5% or less, and even more preferably 0.3% or less.
  • the difference in reflectance between the two regions is preferably 0.3% or less, more preferably 0.15% or less.
  • the display elements include liquid crystal cells, organic EL elements, and inorganic EL elements. Also, the display element may further include a touch panel. Since these display elements are well known to those skilled in the art, detailed description thereof will be omitted.
  • FIG. 2A is a schematic cross-sectional view of an image display device (liquid crystal display device) including a liquid crystal cell as a display element.
  • the image display device 200a includes a backlight unit 110, a rear-side polarizing plate 120, a liquid crystal cell 130, and an optical layered body 100 in this order toward the viewing side.
  • the optical laminate 100 has an adhesive layer (not shown) on the outside of the second polarizing plate 20, and is attached to the liquid crystal cell 130 via the adhesive layer.
  • the absorption axis direction of the second polarizing plate 20 (polarizer 22) and the absorption axis direction of the rear side polarizing plate 120 are substantially orthogonal (for example, 90° ⁇ 5°). °, preferably 90° ⁇ 3°), and the second polarizing plate 20, the liquid crystal cell 130 and the rear side polarizing plate 120 constitute a liquid crystal panel.
  • FIG. 2B is a schematic cross-sectional view of an image display device (liquid crystal display device) including a liquid crystal cell and a touch panel as display elements.
  • the image display device 200b includes a backlight unit 110, a rear-side polarizing plate 120, a liquid crystal cell 130, a touch panel 140, and an optical laminate 100 in this order facing the viewing side.
  • the optical laminate 100 has an adhesive layer (not shown) on the outside of the second polarizing plate 20, and is attached to the touch panel 140 via the adhesive layer.
  • the optical laminate 100 is arranged such that the absorption axis direction of the second polarizing plate 20 (polarizer 22) and the absorption axis direction of the rear-side polarizing plate 120 are substantially perpendicular to each other.
  • the touch panel has an on-cell structure, but it may have an in-cell structure.
  • FIG. 2C is a schematic cross-sectional view of an image display device (organic EL display device) including organic EL elements as display elements.
  • the image display device 200c has the organic EL element 150 and the optical layered body 100 in this order toward the viewing side.
  • the optical laminate 100 has a retardation layer 60 which is a ⁇ /4 plate on the back side of the second polarizing plate 20, and the retardation layer 60 has an absorption axis direction and an absorption axis direction of the polarizer 22. They are arranged so that the angle is 45°.
  • the optical laminate 100 is preferably attached to the organic EL element 150 via an adhesive layer (not shown) provided outside the retardation layer 60 .
  • the configuration in which the first polarizing plate is arranged on the viewing side of the second polarizing plate is shown, but the configuration in which the second polarizing plate is on the viewing side of the first polarizing plate.
  • the surface base material layer is arranged on the surface on the viewing side.
  • the transmittance Ts, parallel transmittance Tp, and orthogonal transmittance Tc were taken as Ts, Tp, and Tc of the polarizer, respectively.
  • These Ts, Tp and Tc are Y values measured with a 2-degree field of view (C light source) according to JIS Z8701 and subjected to visibility correction. From the obtained Tp and Tc, the degree of polarization was determined using the following formula.
  • the transmittance at a wavelength of 380 nm to 780 nm when measured using an external spectrophotometer was defined as the total light transmittance.
  • the total light transmittance is a Y value measured with a 2-degree field of view (C light source) according to JIS Z8701 and subjected to visibility correction.
  • Haze Measured using a haze meter manufactured by Murakami Color Science Laboratory, trade name "HN-150" according to the method defined in JIS 7136.
  • Adhesive layer A containing no colorant Adhesive layer A containing no colorant
  • the pressure-sensitive adhesive composition A obtained above was applied to a release liner R1 (manufactured by Mitsubishi Plastics, Inc., MRF#38) having a thickness of 38 ⁇ m and having one side of the polyester film as the release surface, and one side of the polyester film was the release surface.
  • a release liner R2 manufactured by Mitsubishi Plastics Co., Ltd., MRE #38 with a thickness of 38 ⁇ m is covered to block air, and the pressure-sensitive adhesive layer A (thickness: 250 ⁇ m, total light transmission 92.0% haze, 0.3% haze).
  • Adhesive Layer B Containing Colorant Adhesive layer B (thickness: 250 ⁇ m, total light transmittance: 71.0%, A haze of 1.9%) was formed.
  • the original polyvinyl alcohol film While immersed in a dyeing bath (an aqueous solution with an iodine concentration of 0.1% by weight and a potassium iodide concentration of 0.9% by weight) at 30°C for 30 seconds to dye, the original polyvinyl alcohol film (completely stretched in the conveying direction) It was stretched 3.3 times in the conveying direction (dyeing process) based on the polyvinyl alcohol film that was not uncoated).
  • the dyed polyvinyl alcohol film is immersed in a 40° C. crosslinking bath (aqueous solution with boric acid concentration of 3.0% by weight and potassium iodide concentration of 3.0% by weight) for 28 seconds to restore the original polyvinyl alcohol film.
  • the film was stretched up to 3.6 times in the transport direction (crosslinking step). Furthermore, the obtained polyvinyl alcohol film was immersed in a 61° C. stretching bath (an aqueous solution with a boric acid concentration of 4.0% by weight and a potassium iodide concentration of 5.0% by weight) for 60 seconds to stretch the original polyvinyl alcohol film. After stretching up to 6.0 times in the conveying direction with respect to the alcohol film (stretching step), it was immersed for 10 seconds in a washing bath (aqueous solution having a potassium iodide concentration of 2.0% by weight) at 20 ° C. (washing process). The washed polyvinyl alcohol film was dried at 40° C. for 30 seconds to prepare a polarizer. The thickness of the polarizer was 18 ⁇ m.
  • polarizing plate As an adhesive, a polyvinyl alcohol resin containing an acetoacetyl group (average degree of polymerization: 1,200, saponification degree: 98.5 mol%, acetoacetylation degree: 5 mol%) and methylolmelamine were used. An aqueous solution containing 3:1 weight ratio was used. Using this adhesive, a 30 ⁇ m thick protective layer made of (meth)acrylic resin (modified acrylic polymer having a lactone ring structure) was formed on one surface (display element side) of the polarizer obtained above.
  • a transparent protective film (manufactured by Nippon Shokubai Co., Ltd.) of 49 ⁇ m in thickness is formed by forming HC on a triacetyl cellulose film (manufactured by Fujifilm, product name “TJ40UL”) as a protective layer on the other side (viewing side).
  • TJ40UL triacetyl cellulose film
  • the obtained polarizer had a single transmittance of 41.7% and a degree of polarization of 99.9%.
  • Example 1 The polarizing plates produced in Production Example 4 were used as the first polarizing plate and the second polarizing plate.
  • the composition for forming a printed layer was applied along the outer periphery of one surface (TAC surface with HC) of the first polarizing plate in a frame shape having a width of 1.5 mm in plan view, and dried naturally. to form a black printed layer having a thickness of 5 ⁇ m.
  • the printed layer forming composition was applied in the same manner by silk screen printing again on the printed layer and dried at 50 ° C. for 1 hour to form a black printed layer having a thickness of 5 ⁇ m (finally formed Thickness of printed layer: 10 ⁇ m).
  • the pressure-sensitive adhesive layer A was transferred from the release liner to the printed layer side of the first polarizing plate, and the second polarizing plate was further laminated thereon.
  • the first polarizing plate and the second polarizing plate were arranged so that the absorption axes of the polarizers were parallel to each other.
  • the step portion at the boundary between the printed layer and the first polarizing plate was completely filled with the pressure-sensitive adhesive layer A, and no gap was generated.
  • a surface base material layer is attached to the side of the first polarizing plate opposite to the side on which the second polarizing plate is arranged, with the adhesive layer A interposed therebetween so that the glass film faces the first polarizing plate. Matched.
  • an optical laminate having a configuration of [second polarizing plate/adhesive layer A/printing layer/first polarizing plate/surface base material layer] was obtained.
  • composition for forming a printed layer is applied along the outer periphery of the glass film surface of the surface base layer in a frame shape with a width of 1.5 mm in plan view, and dried at 80 ° C. for 15 minutes to reduce the thickness. A 5 ⁇ m black printed layer was formed. Then, the composition for forming a printed layer was applied in the same manner by silk screen printing again on the printed layer and dried at 120 ° C. for 30 minutes to form a black printed layer having a thickness of 5 ⁇ m (finally formed Thickness of printed layer: 10 ⁇ m).
  • the pressure-sensitive adhesive layer A was transferred from the release liner to the surface of the glass film on which the printed layer was formed, and the polarizing plate obtained in Production Example 4 was attached thereon. At this time, the step portion at the boundary between the printed layer and the glass film was completely filled with the pressure-sensitive adhesive layer A, and no gap was generated. As a result, an optical laminate having a configuration of [polarizing plate/adhesive layer A/printing layer/surface base material layer] was obtained.
  • Comparative Example 2 [polarizing plate/adhesive layer B/printing layer/surface base layer] in the same manner as in Comparative Example 1, except that the pressure-sensitive adhesive layer B was used for bonding the surface base layer with the printed layer and the polarizing plate. An optical laminate having the structure was obtained.
  • composition for forming a print layer was applied along the outer peripheral portion of one surface (TAC surface with HC) of the polarizing plate obtained in Production Example 4 in a frame shape having a width of 1.5 mm in plan view. , and dried naturally to form a black printed layer having a thickness of 5 ⁇ m. Then, the printed layer forming composition was applied in the same manner by silk screen printing again on the printed layer and dried at 50 ° C. for 1 hour to form a black printed layer having a thickness of 5 ⁇ m (finally formed Thickness of printed layer: 10 ⁇ m).
  • the pressure-sensitive adhesive layer B was transferred from the release liner to the side of the polarizing plate on which the printed layer was formed, and the surface base material layer was laminated thereon so that the glass film was on the polarizing plate side.
  • the step portion at the boundary between the printed layer and the polarizing plate was completely filled with the pressure-sensitive adhesive layer B, and no gap was generated.
  • an optical laminate having a structure of [polarizing plate/printing layer/adhesive layer B/surface base material layer] was obtained.
  • a transparent acrylic pressure-sensitive adhesive layer (manufactured by Nitto Denko Corporation, thickness 20 ⁇ m, total light transmittance 88% or more, haze 0.8% or less) was provided on the polarizing plate side of the optical laminates of Examples and Comparative Examples.
  • a black acrylic plate (manufactured by Nitto Jushi Kogyo Co., Ltd., product name “CLAREX”) was attached as a substitute for a display element during non-display through an acrylic pressure-sensitive adhesive layer to obtain an evaluation sample. Regarding the evaluation sample, the color difference ⁇ E*ab between the display area and the non-display area and the reflectance were measured.
  • boundary visibility evaluation between the display area and the non-display area was performed under fluorescent lamp lighting. Evaluation criteria are as follows. [Evaluation criteria] +2: The boundary is almost invisible. +1: Improved compared to Comparative Example 1, but the boundary is visible. 0: The difference in appearance between the display area and the non-display area (border visibility) is about the same as in Comparative Example 1. -1: The boundary is visible compared to Comparative Example 1. -2: The boundary is clearly visible.
  • Table 1 shows the configuration and evaluation results of each optical layered body.
  • the optical layered body according to the embodiment of the present invention when used in an image display device, the color difference and reflectance between the display region and the non-display region during non-display are higher than those of the image display device of the comparative example. is reduced, and good seamlessness is achieved.
  • optical laminate of the present invention can be suitably used for image display devices.
  • REFERENCE SIGNS LIST 10 first polarizing plate 20 second polarizing plate 30 print layer 40 adhesive layer 50 surface base material layer 100 optical laminate 110 backlight unit 120 polarizing plate 130 liquid crystal cell 140 touch panel 150 organic EL element 200 image display device

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