WO2021166434A1 - 光学積層体およびそれを備えた表示装置 - Google Patents

光学積層体およびそれを備えた表示装置 Download PDF

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Publication number
WO2021166434A1
WO2021166434A1 PCT/JP2020/048164 JP2020048164W WO2021166434A1 WO 2021166434 A1 WO2021166434 A1 WO 2021166434A1 JP 2020048164 W JP2020048164 W JP 2020048164W WO 2021166434 A1 WO2021166434 A1 WO 2021166434A1
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WIPO (PCT)
Prior art keywords
layer
optical laminate
thickness
less
display device
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
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PCT/JP2020/048164
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English (en)
French (fr)
Japanese (ja)
Inventor
智煕 柳
柱烈 張
東輝 金
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.)
Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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Priority to KR1020227023355A priority Critical patent/KR20220137623A/ko
Priority to CN202080096921.6A priority patent/CN115136040A/zh
Publication of WO2021166434A1 publication Critical patent/WO2021166434A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • 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
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED

Definitions

  • the present invention relates to an optical laminate and a display device including the same.
  • Patent Document 1 proposes an evaluation method capable of determining the availability as a base material for a flexible touch screen panel, and also provides toughness and bending stress that satisfy the bending fatigue physical properties of the base material for a flexible touch screen panel. The relationship is described.
  • Patent Document 2 relates to a flexible display device that ensures structural flexibility.
  • the flexible display element described in Patent Document 2 includes a base film and a display sheet formed on the upper portion of the base film, and has a structured pattern, and has a neutral surface having a bending stress of 0 (Zero) and a layer having a low fracture point. By moving to, it is possible to prevent damage such as cracks and peeling that occur in the display panel.
  • the present inventors have found that the repulsive force acting in the direction in which the end portion of the optical laminate bends increases as the distance from the bending axis to the end portion becomes shorter.
  • the bending axis is near the center of the optical laminate when the optical laminate is applied to an image display device whose bending axis is not the center of the optical laminate, an image display device in which the bending axis of the optical laminate changes, etc. Since the repulsive force at the end portion can be larger than that, the above problem is likely to occur.
  • the present invention obtains an optical laminate having a small repulsive force generated at an end and an image display device including the optical laminate even when the bending axis is not fixed to the center of the optical laminate.
  • the purpose is.
  • the present invention provides an optical laminate and an image display device illustrated below.
  • An optical laminate including a front plate, a polarizing plate, a back plate, and at least one laminated layer.
  • the flexural rigidity of the optical laminate is K [Garley unit]
  • the following relational expression (1) 400 ⁇ K ⁇ 2000 (1)
  • the optical laminate according to [1] wherein the total of the thickness of the front plate and the thickness of the bonded layer is 50 ⁇ m or more and 200 ⁇ m or less.
  • the optical laminate having a small repulsive force generated at the end and an image display device including the same.
  • the purpose is to provide.
  • the optical laminate of the present invention includes a front plate, a polarizing plate, a back plate, and at least one laminated layer.
  • An example of the layer structure of the optical laminate of the present invention is shown in FIGS. 1 and 2.
  • FIG. 1 is a schematic cross-sectional view of an example of an optical laminate according to the present invention.
  • the optical laminate 100 shown in FIG. 1 has a front plate 10, a bonding layer 40, a polarizing plate 20, a bonding layer 41, and a back plate 30 in this order.
  • FIG. 2 is a schematic cross-sectional view of another example of the optical laminate according to the present invention.
  • the optical laminate 200 shown in FIG. 2 includes a front plate 10, a bonding layer 40, an impact resistant layer 50, a bonding layer 42, a polarizing plate 20, a bonding layer 41, and a back plate 30. Have in order.
  • the thicknesses of the optical laminates 100 and 200 are not particularly limited because they differ depending on the functions required of the optical laminate and the application of the optical laminate, but for example, they may be 30 ⁇ m or more and 2000 ⁇ m or less, and 50 ⁇ m or more and 1500 ⁇ m or less. It may be 70 ⁇ m or more and 1000 ⁇ m or less, 500 ⁇ m or less, or 300 ⁇ m or less.
  • the plan-view shape of the optical laminates 100 and 200 may be, for example, a rectangular shape, preferably a rectangular shape having a long side and a short side, and more preferably a rectangular shape.
  • the length of the long side may be, for example, 10 mm or more and 1400 mm or less, preferably 50 mm or more and 600 mm or less.
  • the length of the short side is, for example, 5 mm or more and 800 mm or less, preferably 30 mm or more and 500 mm or less, and more preferably 50 mm or more and 300 mm or less.
  • Each layer constituting the optical laminates 100 and 200 may have corners R-processed, end portions notched, or perforated.
  • the optical laminates 100 and 200 can be used, for example, in an image display device or the like.
  • the image display device is not particularly limited, and examples thereof include an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electroluminescence display device.
  • the optical laminates 100 and 200 are particularly suitable for an image display device in which the bending axis is not fixed to the center of the optical laminate.
  • the flexural rigidity K [Garley unit] of the optical laminate is 2000 or less, it is possible to obtain an optical laminate in which the repulsive force at the end portion is reduced when the optical laminate is bent.
  • the end portion of the optical laminate may warp as shown in FIG. 3 (a).
  • the repulsive force acting in the direction in which the end portion warps is large, if the optical laminate is housed in the image display device so as to suppress the warp of the end portion, the optical laminate may crack or be placed between the optical laminate and the image display element. Peeling may occur.
  • the present inventors have found that the repulsive force acting in the direction in which the end portion of the optical laminate bends increases as the distance from the bending axis to the end portion increases.
  • the bending axis is near the center of the optical laminate.
  • the repulsive force at the end may be larger than in the case of.
  • the present inventors have found that there is a correlation between the bending rigidity of the optical laminate and the repulsive force at the end, and that the larger the bending rigidity of the optical laminate, the larger the repulsive force.
  • the flexural rigidity K [Garley unit] of the optical laminate is 2000 or less, the repulsive force is reduced, and the optical laminate according to the present invention is an image display device in which the bending axis is not fixed near the center of the optical laminate. Even when applied to an image display device in which the position of the bending axis is variable, problems such as cracks and peeling can be suppressed. Examples of an optical laminate having less warpage at the end when bent are shown in FIGS. 3 (b) and 3 (c). In FIG.
  • the optical laminate is bent with the front plate on the outside.
  • the repulsive force at the end is also small, for example, the bending repulsive force measured by the method described in Examples described later is 7.0 gf or less.
  • the impact resistance of the optical laminate decreases.
  • a defect due to impact for example, a malfunction of the touch sensor
  • the back plate provided on the side opposite to the front plate of the optical laminate, or an image provided with the optical laminate is provided.
  • the durability of the display device may decrease.
  • the flexural rigidity K [Garley unit] of the optical laminate is 400 or more, the optical laminate can have sufficient impact resistance.
  • the impact resistance of the optical laminate can be evaluated as, for example, durability against a pen drop test. Durability to the pen drop test can be assessed by the methods described in Examples below.
  • bending includes a form of bending in which a curved surface is formed in a bent portion, and the bending radius of the bent inner surface is not particularly limited. Bending also includes refraction with an inner surface refraction angle greater than 0 degrees and less than 180 degrees, and folding with an inner surface bending radius close to zero or an inner surface refraction angle of 0 degrees.
  • the flexural rigidity K [Garley unit] is preferably 1800 or less, more preferably 1500 or less. From the viewpoint of improving the impact resistance of the optical laminate, the flexural rigidity K [Garley unit] is preferably 600 or more, more preferably 800 or more, and further preferably 1000 or more.
  • the flexural rigidity of the optical laminate is adjusted to a desired value by changing the type and thickness of the front plate, the type and thickness of the bonded layer, the presence or absence of the impact resistant layer and its thickness, the thickness of the optical laminate, and the like. be able to.
  • the material and thickness of the front plate 10 are not limited as long as it is a plate-like body capable of transmitting light.
  • the front plate may be composed of only one layer, or may be composed of two or more layers.
  • the front plate 10 includes a resin plate (for example, a resin plate, a resin sheet, a resin film, etc.), a glass plate (for example, a glass plate, a glass film, etc.), a resin plate, and a glass.
  • a laminated body with a plate-like body of the above can be mentioned.
  • the front plate 10 can form the outermost surface of the image display device.
  • the thickness of the front plate 10 may be, for example, 10 ⁇ m or more and 500 ⁇ m or less. From the viewpoint of reducing the bending repulsive force, the thickness of the front plate 10 is preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less, and further preferably 60 ⁇ m or less. From the viewpoint of improving impact resistance, the thickness of the front plate 10 is preferably 20 ⁇ m or more, more preferably 30 ⁇ m or more. In the present invention, the thickness of each layer constituting the optical laminate can be measured according to the thickness measuring method described in Examples described later.
  • the resin plate-like body is not limited as long as it can transmit light.
  • the resin constituting the resin plate-like body include triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, and polyether.
  • the resin plate-like body is preferably a resin film formed of a polymer such as polyimide, polyamide, or polyamideimide.
  • the front plate 10 may be a resin film provided with a hard coat layer.
  • the hard coat layer may be formed on one surface of the resin film or may be formed on both sides.
  • the hard coat layer is, for example, a cured layer of an ultraviolet curable resin.
  • the ultraviolet curable resin include acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, epoxy resin and the like.
  • the hard coat layer may contain additives to improve strength.
  • the additive is not particularly limited, and examples thereof include inorganic fine particles, organic fine particles, or a mixture thereof.
  • the front plate 10 is a glass plate
  • tempered glass for a display is preferably used as the glass plate.
  • the thickness of the glass plate may be, for example, 10 ⁇ m or more and 1000 ⁇ m or less, and may be 10 ⁇ m or more and 100 ⁇ m or less.
  • the front plate 10 not only has a function of protecting the front surface (screen) of the display device (function as a window film), but also functions as a touch sensor and blue light cut. It may have a function, a viewing angle adjusting function, and the like.
  • the polarizing plate 20 may be, for example, a linear polarizing plate, a circular polarizing plate, an elliptical polarizing plate, or the like.
  • the circular polarizing plate and the elliptical polarizing plate may be collectively referred to as a circular polarizing plate.
  • the circular polarizing plate includes a linear polarizing plate and a retardation layer. Since the circularly polarizing plate can absorb the external light reflected in the image display device, it is possible to impart a function as an antireflection film to the optical laminate.
  • the thickness of the polarizing plate 20 is usually 5 ⁇ m or more, may be 20 ⁇ m or more, 25 ⁇ m or more, or 30 ⁇ m or more.
  • the thickness of the polarizing plate 20 is preferably 80 ⁇ m or less, and more preferably 60 ⁇ m or less.
  • the linear polarizing plate has a function of selectively transmitting unidirectional linearly polarized light composed of unpolarized light rays such as natural light.
  • the linear polarizing plate includes a stretched film or stretched layer on which a dichroic dye is adsorbed, a cured product of a polymerizable liquid crystal compound, and a dichroic dye, and the dichroic dye is dispersed in the cured product of the polymerizable liquid crystal compound.
  • An oriented liquid crystal layer or the like can be provided as a polarizer layer. When the dye is dispersed and oriented in an anisotropic medium, it may appear colored in one direction and almost colorless in the direction perpendicular to it.
  • a pigment exhibiting such a phenomenon is called a dichroic pigment.
  • a linear polarizing plate using a liquid crystal layer as a polarizer layer is preferable because there is no limitation in the bending direction as compared with a stretched film or a stretched layer on which a dichroic dye is adsorbed.
  • the polarizer layer which is a stretched film having a dichroic dye adsorbed, is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film.
  • the thickness of the polarizer layer is usually 30 ⁇ m or less, preferably 18 ⁇ m or less, and more preferably 15 ⁇ m or less. Reducing the thickness of the polarizer layer is advantageous for thinning the polarizing plate 20.
  • the thickness of the polarizer layer is usually 1 ⁇ m or more, and may be, for example, 5 ⁇ m or more.
  • the polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based resin.
  • the polyvinyl acetate-based resin in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used.
  • examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth) acrylamide compounds having an ammonium group. ..
  • the saponification degree of the polyvinyl alcohol-based resin is usually about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and polyvinyl formal, polyvinyl acetal, and the like modified with aldehydes can also be used.
  • the degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 or more and 10000 or less, preferably 1500 or more and 5000 or less.
  • the polarizer layer which is a stretched layer on which a dichroic dye is adsorbed, is usually a step of applying a coating liquid containing the polyvinyl alcohol-based resin on a base film, a step of uniaxially stretching the obtained laminated film, and a uniaxial A step of dyeing the polyvinyl alcohol-based resin layer of the stretched laminated film with a dichroic dye to adsorb the dichroic dye to form a polarizer layer, and boric acid on the film on which the dichroic dye is adsorbed. It can be produced through a step of treating with an aqueous solution and a step of washing with water after treatment with an aqueous boric acid solution.
  • the base film used to form the polarizer layer may be used as a protective layer for the polarizer layer. If necessary, the base film may be peeled off from the polarizer layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described later.
  • the stretched film or the polarizing element layer which is the stretched layer on which the dichroic dye is adsorbed may be used as it is as a linear polarizing plate, or a protective layer may be formed on one or both sides thereof and used as a linear polarizing plate.
  • a protective layer a thermoplastic resin film described later can be used.
  • the thickness of the obtained linear polarizing plate is preferably 2 ⁇ m or more and 40 ⁇ m or less.
  • the thermoplastic resin film is, for example, a cyclopolyolefin resin film; a cellulose acetate resin film made of a resin such as triacetyl cellulose or diacetyl cellulose; a polyester resin film made of a resin such as polyethylene terephthalate, polyethylene naphthalate, or polybutylene terephthalate; Examples of films known in the art such as polycarbonate-based resin films; (meth) acrylic-based resin films; polypropylene-based resin films and the like can be mentioned.
  • the polarizer layer and the protective layer can be laminated via a bonding layer described later.
  • the thickness of the thermoplastic resin film is usually 100 ⁇ m or less, preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less, still more preferably 40 ⁇ m or less, still more preferably 30 ⁇ m or less. Yes, it is usually 5 ⁇ m or more, preferably 10 ⁇ m or more.
  • a hard coat layer may be formed on the thermoplastic resin film.
  • the hard coat layer may be formed on one side of the thermoplastic resin film, or may be formed on both sides. By providing the hard coat layer, a thermoplastic resin film having improved hardness and scratch resistance can be obtained.
  • the hard coat layer can be formed in the same manner as the hard coat layer formed on the resin film described above.
  • the polymerizable liquid crystal compound used for forming the liquid crystal layer is a compound which has a polymerizable reactive group and exhibits liquid crystal properties.
  • the polymerizable reactive group is a group involved in the polymerization reaction, and is preferably a photopolymerizable reactive group.
  • the photopolymerizable reactive group refers to a group that can participate in the polymerization reaction by an active radical, an acid, or the like generated from the photopolymerization initiator.
  • Examples of the photopolymerizable functional group include a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxylanyl group, an oxetanyl group and the like.
  • an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxylanyl group and an oxetanyl group are preferable, and an acryloyloxy group is more preferable.
  • the type of the polymerizable liquid crystal compound is not particularly limited, and a rod-shaped liquid crystal compound, a disk-shaped liquid crystal compound, and a mixture thereof can be used.
  • the liquid crystal property of the polymerizable liquid crystal compound may be a thermotropic liquid crystal or a lyotropic liquid crystal, and the phase-ordered structure may be a nematic liquid crystal or a smectic liquid crystal.
  • the dichroic dye used for the polarizing element layer which is a liquid crystal layer, preferably has an absorption maximum wavelength ( ⁇ MAX) in the range of 300 to 700 nm.
  • a dichroic dye include an acridine dye, an oxazine dye, a cyanine dye, a naphthalene dye, an azo dye, and an anthraquinone dye, and among them, the azo dye is preferable.
  • the azo dye include a monoazo dye, a bisazo dye, a trisazo dye, a tetrakisazo dye, a stilbene azo dye, and the like, preferably a bisazo dye and a trisazo dye.
  • the dichroic dye may be used alone or in combination of two or more, but it is preferable to combine three or more. In particular, it is more preferable to combine three or more kinds of azo compounds.
  • a part of the dichroic dye may have a reactive group or may have a liquid crystal property.
  • a composition for forming a polarizing layer containing a polymerizable liquid crystal compound and a dichroic dye is applied onto an alignment film formed on a base film, and the polymerizable liquid crystal compound is polymerized. It can be formed by curing it.
  • a polarizer layer may be formed by applying a composition for forming a polarizer layer on a substrate film to form a coating film, and then stretching the coating film together with the substrate film.
  • the base film used to form the polarizer layer may be used as a protective layer for the polarizer layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described above.
  • compositions for forming a polarizer layer containing a polymerizable liquid crystal compound and a dichroic dye examples include JP-A-2013-373353 and JP-A-2013-33249. , JP-A-2017-83843, etc. can be exemplified.
  • additives such as a solvent, a polymerization initiator, a cross-linking agent, a leveling agent, an antioxidant, a plasticizer, and a sensitizer are further added. It may be included. Only one of these components may be used, or two or more of these components may be used in combination.
  • the polymerization initiator that may be contained in the composition for forming a polarizer layer is a compound that can initiate a polymerization reaction of a polymerizable liquid crystal compound, and is photopolymerized in that the polymerization reaction can be initiated under lower temperature conditions.
  • Sex initiators are preferred. Specific examples thereof include photopolymerization initiators capable of generating active radicals or acids by the action of light, and among them, photopolymerization initiators that generate radicals by the action of light are preferable.
  • the content of the polymerization initiator is preferably 1 part by mass or more and 10 parts by mass or less, and more preferably 3 parts by mass or more and 8 parts by mass or less, based on 100 parts by mass of the total amount of the polymerizable liquid crystal compound. Within this range, the reaction of the polymerizable group proceeds sufficiently, and the orientation state of the liquid crystal compound is likely to be stabilized.
  • the thickness of the polarizing element layer which is a liquid crystal layer, is usually 10 ⁇ m or less, preferably 0.5 ⁇ m or more and 8 ⁇ m or less, and more preferably 1 ⁇ m or more and 5 ⁇ m or less.
  • the polarizing element layer which is a liquid crystal layer, may be used as a linear polarizing plate without peeling off the base film, or may be used as a linear polarizing plate by peeling off and removing the base film from the polarizer layer.
  • the polarizing element layer which is a liquid crystal layer, may be used as a linear polarizing plate by forming a protective layer on one side or both sides thereof.
  • the protective layer the above-mentioned thermoplastic resin film can be used.
  • the polarizer layer which is a liquid crystal layer, may have an overcoat layer on one side or both sides of the polarizer layer for the purpose of protecting the polarizer layer.
  • the overcoat layer can be formed, for example, by applying a material (composition) for forming the overcoat layer on the polarizer layer.
  • the material constituting the overcoat layer include a photocurable resin and a water-soluble polymer.
  • a (meth) acrylic resin, a polyvinyl alcohol-based resin, or the like can be used as a material constituting the overcoat layer.
  • the polarizing plate 20 may be provided with a retardation layer on the surface of the linear polarizing plate opposite to the visible side via a bonding layer described later.
  • the retardation layer may be one layer or two or more layers.
  • the retardation layer may have an overcoat layer that protects the surface thereof, a base film that supports the retardation layer, and the like.
  • the retardation layer includes a ⁇ / 4 layer, and may further include at least one of a ⁇ / 2 layer and a positive C layer.
  • the retardation layer includes a ⁇ / 2 layer, the ⁇ / 2 layer and the ⁇ / 4 layer are laminated in order from the linear polarizing plate side.
  • the ⁇ / 4 layer and the positive C layer may be laminated in order from the linear polarizing plate side, or the positive C layer and the ⁇ / 4 layer may be laminated in order from the linear polarizing plate side. May be good.
  • the thickness of the retardation layer is, for example, 0.1 ⁇ m or more and 10 ⁇ m or less, preferably 0.5 ⁇ m or more and 8 ⁇ m or less, and more preferably 1 ⁇ m or more and 6 ⁇ m or less.
  • the retardation layer may be formed from the resin film exemplified as the material of the protective layer, or may be formed from a layer in which the polymerizable liquid crystal compound is cured.
  • the retardation layer may further include an alignment film.
  • the retardation layer may have a bonding layer for bonding the ⁇ / 4 layer, the ⁇ / 2 layer, and the positive C layer.
  • the retardation layer can be formed by applying a composition containing the polymerizable liquid crystal compound to a base film and curing it. An orientation layer may be formed between the base film and the coating layer. The material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film.
  • the retardation layer is formed from the layer obtained by curing the polymerizable liquid crystal compound, the retardation layer may be incorporated into the optical laminate in the form of having an alignment layer and a base film. The retardation layer can be bonded to the linear polarizing plate via the bonding layer.
  • the optical laminate may be provided with an impact resistant layer 50 in order to improve the impact resistance of the optical laminate.
  • the impact resistant layer 50 may be in direct contact with the front plate 10, or may be provided between the impact resistant layer 50 and the front plate 10 via a bonding layer 40 or another layer.
  • the thickness of the impact resistant layer 50 is, for example, 10 ⁇ m or more and 100 ⁇ m or less.
  • the thickness of the impact resistant layer 50 is preferably 80 ⁇ m or less, more preferably 50 ⁇ m or less, preferably 30 ⁇ m or more, and more preferably 40 ⁇ m or more. If the thickness of the impact resistant layer 50 is small, the impact resistance tends to decrease, and if the thickness of the impact resistant layer 50 is large, the bending repulsive force tends to increase.
  • the total thickness of the front plate 10 and the impact resistant layer 50 is, for example, 20 ⁇ m or more and 200 ⁇ m or less.
  • the total thickness of the front plate 10 and the impact resistant layer 50 is preferably 50 ⁇ m or more, preferably 100 ⁇ m or less.
  • the material and thickness of the impact resistant layer 50 are not limited as long as it is a plate-like body capable of transmitting light, and examples thereof include the plate-like body mentioned as the front plate 10.
  • the resin plate-like body constituting the impact resistant layer 50 is preferably a resin film formed of a polymer such as polyethylene naphthalate or polyethylene terephthalate.
  • the optical laminate has at least one laminating layer.
  • the number of bonding layers contained in the optical laminate is preferably 2 or more, preferably 3 or more, 10 or less, and 8 or less.
  • the bonding layer is a layer that is interposed between the two layers to bond them, for example, a layer composed of an adhesive or an adhesive, or a layer obtained by applying some treatment to the layer. You can.
  • the pressure-sensitive adhesive is also called a pressure-sensitive adhesive.
  • adheresive refers to an adhesive other than an adhesive (pressure-sensitive adhesive), and is clearly distinguished from an adhesive.
  • each of the bonded layers constituting the optical laminate is, for example, 3 ⁇ m or more and 50 ⁇ m or less, and preferably 3 ⁇ m or more and 30 ⁇ m or more from the viewpoint of facilitating the bending repulsive force within a predetermined range. If the thickness of the bonded layer is small, the impact resistance tends to decrease, and if the thickness of the bonded layer is large, the bending repulsive force tends to increase.
  • the total thickness of the laminated layers constituting the optical laminate is, for example, 3 ⁇ m or more and 130 ⁇ m or less, preferably 5 ⁇ m or more and 120 ⁇ m or less, and more preferably 10 ⁇ m or more and 100 ⁇ m or less.
  • the total thickness of the front plate 10 and the bonding layer 40 in contact with the front plate may be, for example, 25 ⁇ m or more and 500 ⁇ m or less. From the viewpoint of reducing the bending repulsive force, the total thickness of the front plate 10 and the bonding layer in contact with the front plate is preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less, and further preferably 80 ⁇ m or less. ..
  • the total of the thickness of the front plate and the thickness of all the bonded layers is preferably 50 ⁇ m or more, and more preferably 60 ⁇ m or more from the viewpoint of improving impact resistance.
  • the total of the thickness of the front plate and the thickness of all the bonded layers is preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, from the viewpoint of reducing the bending repulsive force.
  • the optical laminate has at least (1) a front plate thickness of 30 ⁇ m or more and (2) a total thickness of the bonded layers of 20 ⁇ m or more. It is preferable to satisfy one.
  • the pressure-sensitive adhesive layer may be composed of one layer or two or more layers, but is preferably one layer.
  • the pressure-sensitive adhesive layer can be formed from the pressure-sensitive adhesive composition.
  • the pressure-sensitive adhesive layer can be composed of a pressure-sensitive adhesive composition containing a resin as a main component, such as (meth) acrylic-based, rubber-based, urethane-based, ester-based, silicone-based, and polyvinyl ether-based. Among them, a pressure-sensitive adhesive composition using a (meth) acrylic resin having excellent transparency, weather resistance, heat resistance and the like as a base polymer is preferable.
  • the pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type.
  • Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and the like.
  • a polymer or copolymer containing one or more of the (meth) acrylic acid esters as monomers is preferably used. It is preferable that the base polymer is copolymerized with a polar monomer.
  • Examples of the polar monomer include (meth) acrylic acid compound, (meth) acrylic acid 2-hydroxypropyl compound, (meth) acrylic acid hydroxyethyl compound, (meth) acrylamide compound, and N, N-dimethylaminoethyl (meth) acrylate compound.
  • the pressure-sensitive adhesive composition may contain only the above-mentioned base polymer, but usually further contains a cross-linking agent.
  • a cross-linking agent a divalent or higher valent metal ion that forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound that forms an amide bond with the carboxyl group; an ester bond is formed with the carboxyl group.
  • Polyepoxy compounds or polyols; polyisocyanate compounds that form an amide bond with a carboxyl group are exemplified. Of these, polyisocyanate compounds are preferable.
  • the active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by being irradiated with active energy rays such as ultraviolet rays and electron beams, and has adhesiveness even before irradiation with active energy rays. It is an adhesive composition having a property of being able to adhere to an adherend such as, etc., and being cured by irradiation with active energy rays to adjust the adhesive force.
  • the active energy ray-curable pressure-sensitive adhesive composition is preferably an ultraviolet-curable type.
  • the active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the cross-linking agent. Further, if necessary, a photopolymerization initiator, a photosensitizer, or the like may be contained.
  • the pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, pressure-sensitive adhesives, and fillers (metal powders and other inorganic powders). Etc.), antioxidants, UV absorbers, dyes, pigments, colorants, antifoaming agents, corrosion inhibitors, photopolymerization initiators and other additives can be included.
  • a pressure-sensitive adhesive composition is prepared by dissolving or dispersing the pressure-sensitive adhesive composition in an organic solvent such as toluene or ethyl acetate, and this is directly applied to the target surface of the laminated film to form the pressure-sensitive adhesive layer.
  • This can be done by a method, a method in which an adhesive layer is formed in a sheet shape on a separate film that has been subjected to a mold release treatment, and the adhesive layer is transferred to a target surface of a polarizing plate.
  • the active energy ray-curable pressure-sensitive adhesive composition is used, the formed pressure-sensitive adhesive layer can be irradiated with active energy rays to obtain a cured product having a desired degree of curing.
  • the thickness of the pressure-sensitive adhesive layer may be, for example, 1 ⁇ m or more and 100 ⁇ m or less.
  • the thickness of the pressure-sensitive adhesive layer is preferably 3 ⁇ m or more, preferably 50 ⁇ m or less, and more preferably 30 ⁇ m or less. If the thickness of the pressure-sensitive adhesive layer is small, the impact resistance tends to decrease, and if the thickness of the pressure-sensitive adhesive layer is large, the bending repulsive force tends to increase.
  • the storage elastic modulus of the pressure-sensitive adhesive layer at a temperature of 25 ° C. is, for example, 0.01 MPa or more and 0.2 MPa or less. It is considered that the impact resistance is improved when the storage elastic modulus is high.
  • the storage elastic modulus can be measured using a viscoelasticity measuring device (“MCR-301” (trade name) manufactured by Antonio Par).
  • MCR-301 viscoelasticity measuring device
  • the pressure-sensitive adhesive layer is cut into a width of 20 mm and a length of 20 mm, and a plurality of layers are laminated so as to have a thickness of 150 ⁇ m.
  • the laminated pressure-sensitive adhesive layer is joined to the glass plate.
  • the adhesive layer is a known water-based composition (including a water-based adhesive) in which a curable resin component is dissolved or dispersed in water, and a known active energy ray-curable composition containing an active energy ray-curable compound. (Including active energy ray-curable adhesive.) Etc.
  • the resin component contained in the water-based composition examples include polyvinyl alcohol-based resin and urethane resin.
  • the aqueous composition containing a polyvinyl alcohol-based resin is a curable component such as a polyhydric aldehyde, a melamine-based compound, a zirconia compound, a zinc compound, glyoxal, a glyoxal derivative, and a water-soluble epoxy resin in order to improve adhesion and adhesiveness.
  • a cross-linking agent can be further contained.
  • Examples of the aqueous composition containing a urethane resin include an aqueous composition containing a polyester ionomer type urethane resin and a compound having a glycidyloxy group.
  • the polyester ionomer type urethane resin is a urethane resin having a polyester skeleton, and a small amount of an ionic component (hydrophilic component) is introduced therein.
  • the active energy ray-curable composition is a composition that is cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays.
  • the active energy ray-curable composition can be a composition containing an epoxy-based compound that is cured by cationic polymerization as a curable component, and preferably an ultraviolet curable composition containing such an epoxy-based compound as a curable component. It is a thing.
  • the epoxy-based compound means a compound having an average of one or more, preferably two or more epoxy groups in the molecule. Only one type of epoxy compound may be used, or two or more types may be used in combination.
  • epoxy compound a hydrogenated epoxy compound (having an alicyclic ring) obtained by reacting epichlorohydrin with an alicyclic polyol obtained by hydrogenating the aromatic ring of an aromatic polyol.
  • Polyglycidyl ether of polyol an aliphatic epoxy compound such as an aliphatic polyhydric alcohol or a polyglycidyl ether of an alkylene oxide adduct thereof; an epoxy compound having one or more epoxy groups bonded to an alicyclic ring in the molecule. Examples thereof include certain alicyclic epoxy compounds.
  • the active energy ray-curable composition can contain, as a curable component, a (meth) acrylic compound which is radically polymerizable in place of or together with the epoxy compound.
  • the (meth) acrylic compound is a (meth) acrylate monomer having one or more (meth) acryloyloxy groups in the molecule; obtained by reacting two or more kinds of functional group-containing compounds, and at least two in the molecule. Examples thereof include (meth) acryloyloxy group-containing compounds such as (meth) acrylate oligomers having a (meth) acryloyloxy group.
  • the active energy ray-curable composition contains an epoxy compound that is cured by cationic polymerization as a curable component, it preferably contains a photocationic polymerization initiator.
  • the photocationic polymerization initiator include aromatic diazonium salts; onium salts such as aromatic iodonium salts and aromatic sulfonium salts; and iron-allene complexes.
  • the active energy ray-curable composition contains a radically polymerizable component such as a (meth) acrylic compound, it preferably contains a photoradical polymerization initiator.
  • photoradical polymerization initiator examples include an acetophenone-based initiator, a benzophenone-based initiator, a benzoin ether-based initiator, a thioxanthone-based initiator, xanthone, fluorenone, camphorquinone, benzaldehyde, and anthraquinone.
  • the thickness of the adhesive layer may be, for example, 1 ⁇ m or more and 25 ⁇ m or less.
  • the thickness of the adhesive layer is preferably 2 ⁇ m or more, preferably 15 ⁇ m or less, and more preferably 5 ⁇ m or less. If the thickness of the adhesive layer is small, the impact resistance tends to decrease, and if the thickness of the adhesive layer is large, the bending repulsive force tends to increase.
  • the storage elastic modulus of the adhesive layer at a temperature of 25 ° C. is, for example, 1000 MPa or more. It is considered that the impact resistance is improved when the storage elastic modulus is high.
  • the two opposing surfaces that are bonded via the bonding layer may be subjected to corona treatment, plasma treatment, flame treatment, etc. in advance, or may have a primer layer or the like.
  • the back plate 30 a plate-like body capable of transmitting light, a component used in a normal display device, or the like can be used.
  • the components used in the ordinary display device used for the back plate 30 include a separator, a touch sensor panel, an organic EL display element, and the like.
  • the stacking order of the components in the display device is, for example, front plate / circular polarizing plate / separator, front plate / circular polarizing plate / organic EL display element, front plate / circular polarizing plate / touch sensor panel / organic EL display element, front. Examples thereof include a face plate / touch sensor panel / circular polarizing plate / organic EL display element.
  • the back plate 30 is preferably a touch sensor panel.
  • the touch sensor panel is not limited as long as it is a panel having a sensor (that is, a touch sensor) capable of detecting the touched position.
  • the detection method of the touch sensor is not limited, and touch sensor panels such as a resistive film method, a capacitance coupling method, an optical sensor method, an ultrasonic method, an electromagnetic induction coupling method, and a surface acoustic wave method are exemplified. Since the cost is low, a touch sensor panel of a resistance film type or a capacitance coupling type is preferably used.
  • a resistance film type touch sensor As an example of a resistance film type touch sensor, a pair of substrates arranged opposite to each other, an insulating spacer sandwiched between the pair of substrates, and a transparent conductive film provided as a resistance film on the inner front surface of each substrate. Examples thereof include a member composed of a film and a touch position detection circuit.
  • a touch position detection circuit In an image display device provided with a resistance film type touch sensor, when the surface of the front plate is touched, the opposing resistance films are short-circuited and a current flows through the resistance film.
  • the touch position detection circuit detects the change in voltage at this time, and the touched position is detected.
  • An example of a capacitance coupling type touch sensor is a member composed of a substrate, a transparent electrode for position detection provided on the entire surface of the substrate, and a touch position detection circuit.
  • a capacitance coupling type touch sensor when the surface of the front plate is touched, the transparent electrode is grounded via the capacitance of the human body at the touched point.
  • the touch position detection circuit detects the grounding of the transparent electrode, and the touched position is detected.
  • the thickness of the touch sensor panel may be, for example, 5 ⁇ m or more and 2000 ⁇ m or less, preferably 5 ⁇ m or more and 100 ⁇ m or less, and more preferably 5 ⁇ m or more and 50 ⁇ m or less.
  • the touch sensor panel may be a member in which a touch sensor pattern is formed on a base film.
  • the example of the base film may be the same as the example in the description of the thermoplastic resin film described above.
  • the touch sensor panel may be transferred from the base film to the adherend via the pressure-sensitive adhesive layer. That is, the touch sensor panel can be one that does not have a base film.
  • the thickness of the touch sensor pattern may be, for example, 1 ⁇ m or more and 20 ⁇ m or less.
  • the optical laminate can be produced by a method including a step of laminating layers constituting the optical laminate via a laminating layer.
  • a surface activation treatment such as a corona treatment
  • the conditions for corona treatment can be set as appropriate, and the conditions may differ between one surface of the bonded surface and the other surface.
  • the optical laminates 100 and 200 are arranged on the front surface (visual side) of the image display element and can be used as a component of the image display device.
  • the optical laminate which is a circularly polarizing plate, can also be used as an antireflection polarizing plate that imparts an antireflection function in an image display device.
  • the image display device including the optical laminate according to the present invention can be used as a flexible display capable of bending or winding.
  • the image display device which is a flexible display, may be configured to be bendable with the surface (visual side) of the front plate 10 facing outward, and may be wound with the surface (visual side) of the front plate 10 facing outward. It may be configured as possible.
  • Examples of the image display element included in the image display device include an organic EL display element, an inorganic EL display element, a liquid crystal display element, a plasma display element, an electric field radiation type display element, and the like.
  • the image display device can be used as a mobile device such as a smartphone or tablet, a television, a digital photo frame, an electronic signboard, a measuring instrument, an instrument, an office device, a medical device, a computer device, or the like.
  • a resin film having a thickness of 50 ⁇ m in which a hard coat layer was formed on one side of the base film was prepared.
  • the base film was a polyimide resin film having a thickness of 40 ⁇ m.
  • the hard coat layer was a layer having a thickness of 10 ⁇ m and formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the end.
  • a biaxially stretched polyethylene terephthalate (PET) film (“Lumilar”, manufactured by Toray Industries, Inc.) having a thickness of 45 ⁇ m was used.
  • the alignment film composition was applied to one side of a TAC film (manufactured by Konica Minolta Co., Ltd.) having a thickness of 25 ⁇ m, dried and irradiated with polarized UV to form a photoalignment film.
  • a composition containing a dichroic dye and a polymerizable liquid crystal compound is applied onto the photoalignment film, dried, and then the polymerizable liquid crystal compound is cured by irradiation with ultraviolet rays to form a polarizer (thickness 2.5 ⁇ m). Formed.
  • a protective layer composition containing polyvinyl alcohol and water was applied and dried on the surface of the polarizer opposite to the TAC film side to form a protective layer (thickness 1 ⁇ m, omitted in the figure). In this way, a linear polarizing plate was obtained.
  • a circular polarizing plate was obtained by laminating the ⁇ / 4 layer side of the retardation layer, which will be described later, on the protective layer of the linear polarizing plate.
  • the retardation layer has a thickness of 15 ⁇ m, and has a structure in which an adhesive layer, a ⁇ / 4 layer, an adhesive layer, and a positive C layer are laminated in this order.
  • Each of the pressure-sensitive adhesive layers had a thickness of 5 ⁇ m.
  • the ⁇ / 4 layer had a layer in which the liquid crystal compound was cured and an alignment film, and had a thickness of 2 ⁇ m.
  • the positive C layer had a layer in which the liquid crystal compound was cured and an alignment film, and had a thickness of 3 ⁇ m. In this way, a circular polarizing plate having a layer structure of "TAC film / photoalignment film / polarizer / protective layer / retardation layer" was prepared.
  • a polyimide resin film (thickness 50 ⁇ m, Kolon) was prepared as the back plate 30.
  • the front plate 10, the impact resistant layer 50, the polarizing plate 20, and the back plate 30 were laminated in this order.
  • the front plate 10 and the impact resistant layer 50 have a bonding layer A
  • the impact resistant layer 50 and the polarizing plate 20 have a bonding layer B
  • the polarizing plate 20 and the back plate 30 have a bonding layer C.
  • the optical laminate of Example 1 was obtained by laminating the mixture.
  • the bonding layers A, B and C the pressure-sensitive adhesive layers having the thickness shown in Table 1 were used.
  • the bonded surface was corona-treated.
  • the obtained optical laminate had a configuration as shown in FIG.
  • Example 2 An optical laminate of Example 2 was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive layers having the thicknesses shown in Table 1 were used as the bonding layers A, B and C.
  • Example 3 As the front plate 10, a polyimide resin film having a thickness of 25 ⁇ m and a hard coat layer having a thickness of 7 ⁇ m were used on one side, and a resin film having a thickness of 32 ⁇ m was used.
  • An optical laminate of Example 3 was obtained in the same manner as in Example 1 except that the adhesive layer was used as the bonding layer A.
  • As the adhesive layer of the bonding layer A an adhesive layer having a thickness of 2.0 ⁇ m, which was coated with an active energy ray-curable composition and cured by irradiating with ultraviolet rays, was used.
  • Example 4 An optical laminate of Example 4 was obtained in the same manner as in Example 3 except that the pressure-sensitive adhesive layer having the thickness shown in Table 1 was used as the bonding layer A.
  • Example 5 The optical lamination of Example 5 was carried out in the same manner as in Example 2 except that a polyimide resin film having a thickness of 25 ⁇ m and a hard coat layer having a thickness of 7 ⁇ m and a resin film having a thickness of 32 ⁇ m were used as the front plate 10. I got a body.
  • ⁇ Comparative example 1> As the front plate 10, a resin film having a thickness of 62 ⁇ m having a polyimide resin film having a thickness of 50 ⁇ m and a hard coat layer having a thickness of 12 ⁇ m on one side was used, and Table 1 shows the bonded layers A, B, and C. An optical laminate of Comparative Example 1 was obtained in the same manner as in Example 1 except that a thick pressure-sensitive adhesive layer was used.
  • the thickness of each layer was measured using an ellipsometer (M-220, manufactured by JASCO Corporation) or a contact film thickness meter (MH-15M manufactured by Nikon Corporation, counter TC101, MS-5C).
  • the repulsive force of the optical laminate was measured according to the method shown in FIG. First, the optical laminate was cut into 2.54 cm ⁇ 8.89 cm test pieces. The test piece was bent so as to be wound around a bending jig 500 having a thickness of 8 mm so that the front plate was on the outside, fixed with tape, and installed on the stage 501. The tape fixing length 504 on the bottom surface of the folding jig 500 was 35 mm, and the tape fixing length 505 on the top surface of the folding jig 500 was 30 mm. The end portion of the test piece was warped by a warp amount of 503 in the direction away from the bending jig 500.
  • the plate 502 is moved from a height of 35 mm above the stage 501 so as to bring the curved portion of the optical laminate 200 closer to the bent jig 500, held at a height of 8 mm from the stage 501 for 30 seconds, and then to a height of 35 mm.
  • the maximum repulsive force during this period was measured using a SurTA system (bending mode, manufactured by Chemilab), and used as a bending repulsive force.
  • the moving speed of the plate 502 was 5 mm / sec.
  • the bending radius of the optical laminate was 4 mm (4R).
  • the bending repulsive force was evaluated according to the following criteria, and the results are shown in Table 1.
  • the impact resistance test As the impact resistance test, an optical laminate having a touch sensor panel was used instead of the polyimide resin film which is the back plate of the optical laminates of the above-mentioned Examples and Comparative Examples. A rectangular piece having a long side of 150 mm and a short side of 70 mm was cut out using a super cutter from a laminated body in which a front plate and a circularly polarizing plate were bonded by a bonding layer. The circularly polarizing plate side of the small piece was bonded to the ITO layer side of the touch panel sensor via the adhesive layer to obtain an optical laminate for testing. As the touch sensor panel, a panel having only a touch sensor pattern layer and no base film was used.
  • the touch sensor pattern layer includes an ITO layer as a transparent conductive layer and a cured layer of an acrylic resin composition as a separation layer, and has a thickness of 7 ⁇ m.
  • the evaluation pen is held so that the pen tip is located at a distance of 10 cm from the outermost surface of the front plate of the small piece and the pen tip faces downward. Then, the evaluation pen was dropped from that position. A mark was written on the front plate of the small piece at the position where the pattern of the transparent conductive layer of the touch sensor panel was located, and the evaluation pen was dropped so that the pen tip touched the mark. As the evaluation pen, a pen having a weight of 11 g and a pen tip diameter of 0.7 mm was used. The small pieces after dropping the evaluation pen were visually observed and the touch sensor panel function was confirmed, and the evaluation was performed according to the following criteria. Table 1 shows the evaluation results. A: No cracks. Touch sensor panel function maintenance. B: There is a crack. Touch sensor panel function maintenance. C: There is a crack. No touch sensor panel function.

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  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
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WO2019225631A1 (ja) * 2018-05-22 2019-11-28 富士フイルム株式会社 光学フィルム、偏光板、液晶パネル、タッチパネル及び画像表示装置

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WO2019058759A1 (ja) * 2017-09-22 2019-03-28 富士フイルム株式会社 積層体、偏光板、及び画像表示装置
WO2019225631A1 (ja) * 2018-05-22 2019-11-28 富士フイルム株式会社 光学フィルム、偏光板、液晶パネル、タッチパネル及び画像表示装置

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