WO2023013275A1 - Plaque de polarisation équipée d'une couche de retard et dispositif d'affichage d'image l'utilisant - Google Patents

Plaque de polarisation équipée d'une couche de retard et dispositif d'affichage d'image l'utilisant Download PDF

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WO2023013275A1
WO2023013275A1 PCT/JP2022/025045 JP2022025045W WO2023013275A1 WO 2023013275 A1 WO2023013275 A1 WO 2023013275A1 JP 2022025045 W JP2022025045 W JP 2022025045W WO 2023013275 A1 WO2023013275 A1 WO 2023013275A1
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layer
polarizing plate
retardation layer
retardation
thickness
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PCT/JP2022/025045
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English (en)
Japanese (ja)
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理 小島
裕美 池嶋
泰介 笹川
歩夢 中原
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日東電工株式会社
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Priority to KR1020247002440A priority Critical patent/KR20240034769A/ko
Priority to CN202280055073.3A priority patent/CN117859080A/zh
Publication of WO2023013275A1 publication Critical patent/WO2023013275A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal 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
    • 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
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • 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
    • 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
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • 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
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness

Definitions

  • the present invention relates to a polarizing plate with a retardation layer and an image display device using the same.
  • Image display devices represented by liquid crystal display devices and electroluminescence (EL) display devices are rapidly spreading.
  • Polarizing plates and retardation plates are typically used in image display devices.
  • a polarizing plate with a retardation layer, in which a polarizing plate and a retardation plate are integrated, is widely used (for example, Patent Document 1).
  • the present invention has been made in view of the above, and its main purpose is to provide a polarizing plate with a retardation layer having both hardness and durability against deformation.
  • a polarizing plate with a retardation layer has a protective layer, a polarizing film and a retardation layer in this order, the surface hardness of the protective layer side is 2B or more in pencil hardness, and the protective layer The thickness of the laminated portion up to the retardation layer is 32 ⁇ m or less.
  • the protective layer contains a substrate having an indentation elastic recovery rate of 67% or less.
  • the base material accounts for 65% or more of the thickness from the center of the laminated portion to the surface of the protective layer.
  • the protective layer includes a portion having an indentation hardness of 0.35 GPa or more.
  • the protective layer has a thickness of 12 ⁇ m or more and less than 20 ⁇ m. In one embodiment, the protective layer includes a hard coat layer having a thickness of 5 ⁇ m or less. In one embodiment, the retardation layer is a fixed alignment layer of a liquid crystal compound. In one embodiment, the protective layer comprises a substrate having a moisture permeability of less than 200 g/m 2 ⁇ 24 h at 40°C and 92% RH. According to another aspect of the present invention, an image display device is provided. This image display device has the above polarizing plate with a retardation layer.
  • both hardness and durability against deformation can be achieved in the retardation layer-attached polarizing plate.
  • FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a polarizing plate with a retardation layer according to one embodiment of the present invention
  • FIG. FIG. 2 is a cross-sectional view showing an example of the configuration of a protective layer of the polarizing plate with a retardation layer shown in FIG. 1; It is a figure for demonstrating the ratio which the center of a lamination
  • refractive index (nx, ny, nz) is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., slow axis direction), and "ny” is the in-plane direction orthogonal to the slow axis (i.e., fast axis direction) and "nz” is the refractive index in the thickness direction.
  • In-plane retardation (Re) “Re( ⁇ )” is an in-plane retardation measured at 23° C. with light having a wavelength of ⁇ nm.
  • Re(550) is the in-plane retardation measured with light having a wavelength of 550 nm at 23°C.
  • Thickness direction retardation (Rth) is the retardation in the thickness direction measured at 23° C. with light having a wavelength of ⁇ nm.
  • Rth(550) is the retardation in the thickness direction measured at 23° C. with light having a wavelength of 550 nm.
  • FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a polarizing plate with a retardation layer according to one embodiment of the present invention.
  • a polarizing plate 100 with a retardation layer has a polarizing plate 10 including a polarizing film 11 and a protective layer 12 disposed on one side of the polarizing film 11 and a retardation layer 20 .
  • the retardation layer-attached polarizing plate 100 has the protective layer 12, the polarizing film 11, and the retardation layer 20 in this order.
  • the retardation layer 20 can function as a protective layer for the polarizing film 11 . According to such a configuration, the thickness of the retardation layer-attached polarizing plate, which will be described later, can be satisfactorily achieved.
  • the retardation layer-attached polarizing plate 100 is typically arranged so that the polarizing plate 10 is on the viewer side of the retardation layer 20 in the image display device.
  • protective layer 12 is located on the top surface of the image display device.
  • the retardation layer 20 has a laminated structure including the first retardation layer 21 and the second retardation layer 22, but unlike the illustrated example, the retardation layer 20 has a lamination structure of three or more layers. It may have a structure or may be a single layer.
  • Each member constituting the retardation layer polarizing plate can be laminated via any appropriate adhesive layer (not shown).
  • the adhesive layer include an adhesive layer and an adhesive layer.
  • the protective layer 12 is attached to the polarizing film 11 via an adhesive layer (preferably using an active energy ray-curable adhesive).
  • the retardation layer 20 is attached to the polarizing film 11 via an adhesive layer (preferably using an active energy ray-curable adhesive).
  • the retardation layers are attached to each other, for example, via an adhesive layer (preferably using an active energy ray-curable adhesive).
  • the thickness of the adhesive layer is preferably 0.4 ⁇ m or more, more preferably 0.4 ⁇ m to 3.0 ⁇ m, still more preferably 0.6 ⁇ m to 1.5 ⁇ m.
  • an adhesive layer may be provided on the side of the retardation layer 20 on which the polarizing film 11 is not arranged.
  • This pressure-sensitive adhesive layer enables, for example, the polarizing plate 100 with a retardation layer to be attached to an image display panel included in an image display device.
  • a release film is attached to the surface of this pressure-sensitive adhesive layer. The release film can be temporarily attached until the polarizing plate with the retardation layer is ready for use.
  • a release film for example, it is possible to protect the pressure-sensitive adhesive layer and roll-form the polarizing plate.
  • the polarizing plate with a retardation layer may be elongated or sheet-shaped.
  • the term "elongated” refers to an elongated shape whose length is sufficiently longer than its width, for example, an elongated shape whose length is 10 times or more, preferably 20 times or more, its width.
  • the elongated retardation layer polarizing plate can be wound into a roll.
  • the surface hardness of the protective layer 12 (polarizing plate 10) side of the retardation layer-attached polarizing plate is 2B or more, preferably B or more in terms of pencil hardness.
  • the surface hardness of the protective layer 12 is, for example, 4H or less in terms of pencil hardness.
  • the thickness of the laminated portion from the protective layer 12 to the retardation layer 20 (sometimes simply referred to as "the thickness of the polarizing plate with retardation layer”) is 32 ⁇ m or less, preferably 31 ⁇ m or less. With such a thickness, it is possible to remarkably achieve durability against deformation (for example, bending resistance) while satisfying the above-described surface hardness. Specifically, expansion and contraction caused by deformation (eg, bending) can be reduced to suppress the occurrence of fracture (eg, interfacial failure). In addition, it contributes to the thinning of the image display device, and for example, it is possible to mount a member (such as a battery) to cope with the increase in size of the screen. On the other hand, the thickness of the retardation layer-attached polarizing plate is, for example, 25 ⁇ m or more.
  • the thickness of the retardation layer-attached polarizing plate also includes the thickness of the adhesive layer. Specifically, an adhesive layer that may be arranged between the protective layer and the polarizing film, an adhesive layer that may be arranged between the polarizing film and the retardation layer, and when the retardation layer has a laminated structure Also included is the thickness of the adhesive layer that may be placed between the retardation layers.
  • the thickness of the retardation layer-attached polarizing plate does not include an adhesive layer for adhering the retardation layer-attached polarizing plate to an external adherend such as a panel or glass.
  • the polarizing plate includes a polarizing film and a protective layer.
  • a polarizing plate can be obtained by laminating a polarizing film and a protective layer via an adhesive layer.
  • the polarizing film is typically a resin film containing a dichroic substance (eg, iodine).
  • resin films include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene/vinyl acetate copolymer films.
  • the thickness of the polarizing film is preferably 12 ⁇ m or less, more preferably 10 ⁇ m or less, and even more preferably 8 ⁇ m or less. On the other hand, the thickness of the polarizing film is preferably 1 ⁇ m or more.
  • the polarizing film preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the single transmittance of the polarizing film is, for example, 41.5% to 48.0%, preferably 42.0% to 46.0%.
  • the polarization degree of the polarizing film is, for example, 90.0% or more, preferably 99.0% or more, and more preferably 99.9% or more.
  • the polarizing film can be produced by any appropriate method. Specifically, the polarizing film may be produced from a single-layer resin film, or may be produced using a laminate of two or more layers.
  • the method of producing a polarizing film from the above single-layer resin film typically includes subjecting the resin film to a dyeing treatment with a dichroic substance such as iodine or a dichroic dye and a stretching treatment.
  • a dichroic substance such as iodine or a dichroic dye
  • a stretching treatment for example, hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene/vinyl acetate copolymer films are used.
  • the method may further include an insolubilization treatment, a swelling treatment, a cross-linking treatment, and the like. Since such a manufacturing method is well known and commonly used in the industry, detailed description thereof will be omitted.
  • a polarizing film obtained using the laminate can be produced, for example, using a laminate of a resin substrate and a resin film or resin layer (typically, a PVA-based resin layer).
  • a PVA-based resin solution is applied to a resin base material, dried to form a PVA-based resin layer on the resin base material, and a laminate of the resin base material and the PVA-based resin layer is obtained; stretching and dyeing the laminate to make the PVA-based resin layer into a polarizing film;
  • a PVA-based resin layer containing a halide and a PVA-based resin is formed on one side of the resin substrate. Stretching typically includes immersing the laminate in an aqueous boric acid solution for stretching.
  • 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 laminate is preferably subjected to drying shrinkage treatment in which the laminate is heated while being conveyed in the longitudinal direction to shrink the laminate by 2% or more in the width direction.
  • the manufacturing method of the present embodiment includes subjecting the laminate to an in-air auxiliary stretching treatment, a dyeing treatment, an underwater stretching treatment, and a drying shrinkage treatment in this order.
  • a polarizing plate can be obtained by laminating a protective layer on the peeled surface of the obtained resin substrate/polarizing film laminate, or on the surface opposite to the peeled surface. Details of the method for manufacturing such a polarizing film are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580 and Japanese Patent No. 6470455. These publications are incorporated herein by reference in their entirety.
  • FIG. 2 is a cross-sectional view showing an example of the structure of the protective layer of the polarizing plate with a retardation layer shown in FIG.
  • the protective layer 12 has a substrate (film) 12a and a hard coat (HC) layer 12b formed on the substrate 12a.
  • HC hard coat
  • the retardation layer-attached polarizing plate is typically arranged on the viewing side of the image display device, and the hard coat layer 12b is arranged on the viewing side of the substrate 12a.
  • the hard coat layer 12b may function as other functional layers such as an antireflection layer, an antisticking layer, an antiglare layer, and the like.
  • the thickness of the protective layer is preferably less than 20 ⁇ m, more preferably 18 ⁇ m or less. On the other hand, the thickness of the protective layer is preferably 12 ⁇ m or more, more preferably 14 ⁇ m or more.
  • the moisture permeability of the protective layer at 40° C. and 92% RH is preferably less than 200 g/m 2 ⁇ 24 h, may be 150 g/m 2 ⁇ 24 h or less, or may be 100 g/m 2 ⁇ 24 h or less. It may be 50 g/m 2 ⁇ 24 h or less.
  • the moisture permeability of the protective layer at 40° C. and 92% RH is, for example, 1 g/m 2 ⁇ 24 h or more.
  • the indentation elastic recovery rate of the substrate is preferably 67% or less, more preferably 65% or less, and may be 60% or less.
  • durability against deformation for example, bending resistance
  • the stress caused by deformation eg, bending
  • the adhesiveness to the hard coat layer can be excellent.
  • the indentation elastic recovery rate of the substrate is, for example, 35% or more.
  • the thickness of the base material is, for example, 10 ⁇ m to 16 ⁇ m, preferably 11 ⁇ m to 15 ⁇ m, more preferably 12 ⁇ m to 14 ⁇ m.
  • the ratio of the base material is preferably 65% or more, more preferably 75%. % or more.
  • the ratio of the substrate to the thickness from the center of the laminated portion (polarizing plate with retardation layer) to the surface of the protective layer is preferably 90% or less.
  • FIG. 3 is a diagram for explaining the ratio of the center of the laminated portion (polarizing plate with retardation layer) and the substrate. Note that hatching is omitted in FIG.
  • Laminated portion (polarizing plate with retardation layer) 102 includes protective layer 12 including hard coat layer 12b and substrate 12a, adhesive layer 52, polarizing film 11, adhesive layer 54, first retardation layer 21, adhesive It has a layer 56 and a second retardation layer 22 in that order.
  • the ratio of the thickness t of the base material 12a to the distance d from the center 103 of the laminated portion 102 to the surface 13 of the protective layer 12 is preferably 65% or more, more preferably. is 75% or more. In one embodiment, the ratio is controlled by adjusting the thickness of the hard coat layer.
  • the base material can be composed of any appropriate film that can be used as a protective layer for the polarizing film.
  • materials that are the main component of such films include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, Transparent resins such as polysulfone-based, polystyrene-based, cycloolefin-based resins such as polynorbornene, polyolefin-based, (meth)acrylic-based, and acetate-based resins can be used.
  • at least one selected from polycarbonate-based resins and cycloolefin-based resins is used as the material constituting the base material.
  • the indentation hardness of the hard coat layer is preferably 0.35 GPa or more, more preferably 0.4 GPa or more, and still more preferably 0.45 GPa or more. On the other hand, the indentation hardness of the hard coat layer is, for example, 0.70 GPa or less.
  • the indentation elastic recovery rate of the hard coat layer is preferably 70% or more, more preferably 75% or more. On the other hand, the indentation elastic recovery rate of the hard coat layer is, for example, 95% or less.
  • the thickness of the hard coat layer is preferably 5 ⁇ m or less, more preferably 4 ⁇ m or less, and even more preferably 3 ⁇ m or less. By providing such a hard coat layer, durability against deformation (for example, bending resistance) can be achieved while satisfying the above surface hardness. On the other hand, the thickness of the hard coat layer is, for example, 1 ⁇ m or more.
  • the hard coat layer is typically formed by applying a hard coat layer-forming material to the substrate and curing the applied layer.
  • a hard coat layer-forming material typically contains a curable compound as a layer-forming component. Curing mechanisms of the curable compound include, for example, thermosetting and photocuring. Curable compounds include, for example, monomers, oligomers, and prepolymers. Preferably, polyfunctional monomers or oligomers are used as curable compounds.
  • polyfunctional monomers or oligomers include monomers or oligomers having two or more (meth)acryloyl groups, urethane (meth)acrylates or urethane (meth)acrylate oligomers, epoxy-based monomers or oligomers, and silicone-based monomers or oligomers. are mentioned.
  • the hard coat layer-forming material may contain any appropriate additive.
  • Additives include, for example, polymerization initiators, leveling agents, antiblocking agents, dispersion stabilizers, thixotropic agents, antioxidants, UV absorbers, antifoaming agents, thickeners, dispersants, surfactants, and catalysts. , fillers, lubricants, antistatic agents, and the like.
  • the type, combination, content, etc. of additives can be appropriately set according to the purpose and desired properties.
  • the heating temperature is, for example, 60°C to 140°C, preferably 60°C to 100°C.
  • the curing treatment is typically carried out by UV irradiation.
  • the integrated amount of UV irradiation is, for example, 100 mJ/cm 2 to 300 mJ/cm 2 .
  • UV irradiation and heating may be combined. In this case, typically, ultraviolet irradiation is performed after heating the coating film.
  • the heating temperature is as described above for the thermosetting curable compound.
  • the thickness of the retardation layer is preferably 10 ⁇ m or less, more preferably 8 ⁇ m or less, and even more preferably 7 ⁇ m or less, depending on its configuration (whether it is a single layer or has a laminated structure). is. On the other hand, the thickness of the retardation layer is, for example, 0.5 ⁇ m or more.
  • the "thickness of the retardation layer” means the total thickness of each retardation layer. Specifically, the "thickness of the retardation layer" does not include the thickness of the adhesive layer.
  • an alignment solidified layer of a liquid crystal compound (liquid crystal alignment solidified layer) is preferably used.
  • a liquid crystal compound for example, the difference between nx and ny in the resulting retardation layer can be significantly increased compared to a non-liquid crystal material. thickness can be significantly reduced. Therefore, it is possible to realize a remarkable thinning of the polarizing plate with the retardation layer.
  • the term "fixed alignment layer” refers to a layer in which a liquid crystal compound is aligned in a predetermined direction and the alignment state is fixed.
  • the "alignment fixed layer” is a concept including an alignment cured layer obtained by curing a liquid crystal monomer as described later.
  • rod-shaped liquid crystal compounds are typically aligned in the slow axis direction of the retardation layer (homogeneous alignment).
  • the liquid crystal alignment fixed layer is formed by subjecting the surface of a predetermined base material to an alignment treatment, coating the surface with a coating liquid containing a liquid crystal compound, and orienting the liquid crystal compound in a direction corresponding to the alignment treatment. It can be formed by fixing the orientation state. Any appropriate orientation treatment can be adopted as the orientation treatment. Specific examples include mechanical orientation treatment, physical orientation treatment, and chemical orientation treatment. Specific examples of mechanical orientation treatment include rubbing treatment and stretching treatment. Specific examples of physical orientation treatment include magnetic orientation treatment and electric field orientation treatment. Specific examples of chemical alignment treatment include oblique vapor deposition and photo-alignment treatment. Arbitrary appropriate conditions can be adopted as the processing conditions for various alignment treatments depending on the purpose.
  • the alignment of the liquid crystal compound is performed by processing at a temperature that exhibits a liquid crystal phase depending on the type of liquid crystal compound. By performing such a temperature treatment, the liquid crystal compound assumes a liquid crystal state, and the liquid crystal compound is aligned in accordance with the orientation treatment direction of the surface of the base material.
  • the alignment state is fixed by cooling the liquid crystal compound aligned as described above.
  • the orientation state is fixed by subjecting the liquid crystal compound oriented as described above to a polymerization treatment or a crosslinking treatment.
  • liquid crystal compound and details of the method for forming the alignment fixed layer are described in JP-A-2006-163343. The description of the publication is incorporated herein by reference.
  • the retardation layer may be a single layer or may have a laminated structure of two or more layers.
  • the retardation layer when the retardation layer is a single layer, the retardation layer can function as a ⁇ /4 plate.
  • Re(550) of the retardation layer is preferably 100 nm to 180 nm, more preferably 110 nm to 170 nm, still more preferably 110 nm to 160 nm.
  • the thickness of the retardation layer can be adjusted so as to obtain the desired in-plane retardation of the ⁇ /4 plate.
  • the retardation layer is the liquid crystal alignment fixing layer described above, its thickness is, for example, 1.0 ⁇ m to 2.5 ⁇ m.
  • the angle between the slow axis of the retardation layer and the absorption axis of the polarizing film is preferably 40° to 50°, more preferably 42° to 48°, and even more preferably 44°. ° to 46°.
  • the retardation layer preferably exhibits reverse dispersion wavelength characteristics in which the retardation value increases according to the wavelength of the measurement light.
  • the retardation layer 20 when the retardation layer 20 has a laminated structure, the retardation layer 20 includes, for example, a first retardation layer (H layer) 21 and a second retardation layer (Q layer) in order from the polarizing plate 10 side. 22 are arranged in a two-layer laminated structure.
  • the H layer can typically function as a ⁇ /2 plate and the Q layer can typically function as a ⁇ /4 plate.
  • Re(550) of the H layer is preferably 200 nm to 300 nm, more preferably 220 nm to 290 nm, still more preferably 230 nm to 280 nm;
  • Re(550) of the Q layer is preferably It is 100 nm to 180 nm, more preferably 110 nm to 170 nm, even more preferably 110 nm to 150 nm.
  • the thickness of the H layer can be adjusted to obtain the desired in-plane retardation of the ⁇ /2 plate.
  • the H layer is the liquid crystal alignment fixing layer described above, its thickness is, for example, 2.0 ⁇ m to 4.0 ⁇ m.
  • the thickness of the Q layer can be adjusted to obtain the desired in-plane retardation of the ⁇ /4 plate.
  • the Q layer is the liquid crystal alignment fixing layer described above, its thickness is, for example, 0.5 ⁇ m to 2.5 ⁇ m.
  • the angle between the slow axis of the H layer and the absorption axis of the polarizing film is preferably 10° to 20°, more preferably 12° to 18°, still more preferably 12°. ⁇ 16°; the angle formed by the slow axis of the Q layer and the absorption axis of the polarizing film is preferably 70° to 80°, more preferably 72° to 78°, still more preferably 72° ⁇ 76°.
  • each layer may exhibit reverse dispersion wavelength characteristics in which the retardation value increases according to the wavelength of the measurement light. It may exhibit a positive wavelength dispersion characteristic in which the value decreases according to the wavelength of the measurement light, or may exhibit a flat wavelength dispersion characteristic in which the retardation value hardly changes even with the wavelength of the measurement light.
  • the Nz coefficient of the retardation layer is preferably 0.9 to 1.5, more preferably 0.9 to 1.3.
  • the retardation layer is preferably a liquid crystal alignment fixed layer.
  • the liquid crystal compound include a liquid crystal compound having a nematic liquid crystal phase (nematic liquid crystal).
  • a liquid crystal compound for example, a liquid crystal polymer or a liquid crystal monomer can be used. Either lyotropic or thermotropic mechanism may be used to develop the liquid crystallinity of the liquid crystal compound.
  • the liquid crystal polymer and liquid crystal monomer may be used alone or in combination.
  • the liquid crystal monomer is preferably a polymerizable monomer and a crosslinkable monomer.
  • the alignment state of the liquid crystal monomer can be fixed by polymerizing or cross-linking (that is, curing) the liquid crystal monomer. After aligning the liquid crystal monomers, for example, the alignment state can be fixed by polymerizing or cross-linking the liquid crystal monomers.
  • a polymer is formed by polymerization and a three-dimensional network structure is formed by cross-linking, but these are non-liquid crystalline. Therefore, the formed retardation layer does not undergo a transition to a liquid crystal phase, a glass phase, or a crystal phase due to a change in temperature, which is peculiar to liquid crystalline compounds. As a result, the retardation layer becomes a highly stable retardation layer that is not affected by temperature changes.
  • the temperature range in which the liquid crystal monomer exhibits liquid crystallinity differs depending on the type. Specifically, the temperature range is preferably 40°C to 120°C, more preferably 50°C to 100°C, and most preferably 60°C to 90°C.
  • liquid crystal monomer Any appropriate liquid crystal monomer can be adopted as the liquid crystal monomer.
  • polymerizable mesogenic compounds described in JP-T-2002-533742 WO00/37585
  • EP358208 US5211877
  • EP66137 US4388453
  • WO93/22397 EP0261712, DE19504224, DE4408171, and GB2280445
  • Specific examples of such polymerizable mesogenic compounds include LC242 (trade name) available from BASF, E7 (trade name) available from Merck, and LC-Sillicon-CC3767 (trade name) available from Wacker-Chem.
  • a nematic liquid crystal monomer is preferable as the liquid crystal monomer.
  • the retardation layer-attached polarizing plate according to the embodiment of the present invention can be obtained by laminating the polarizing plate and the retardation layer.
  • the lamination of the polarizing plate and the retardation layer is performed, for example, while transporting them by roll (so-called roll-to-roll).
  • Lamination is typically performed by transferring a liquid crystal alignment solidified layer formed on a substrate.
  • each retardation layer may be sequentially laminated (transferred) to the polarizing plate, and a laminate in which the retardation layers are laminated in advance is attached to the polarizing plate. It may be laminated (transferred).
  • an image display device has the retardation layer-attached polarizing plate.
  • the thickness and moisture permeability are values measured by the following measuring methods. In addition, unless otherwise specified, "parts" and “%" in Examples and Comparative Examples are by weight. 1. Thickness The thickness of 10 ⁇ m or less was measured using a scanning electron microscope (manufactured by JEOL Ltd., product name “JSM-7100F”). A thickness exceeding 10 ⁇ m was measured using a digital micrometer (manufactured by Anritsu Co., Ltd., product name “KC-351C”). 2. Moisture Permeability Moisture permeability was determined by the cup method (JIS Z 0208).
  • Example 1 Preparation of polarizing plate
  • a thermoplastic resin substrate a long amorphous isophthalic copolymerized polyethylene terephthalate film (thickness: 100 ⁇ m) having a Tg of about 75° C. was used, and one side of this resin substrate was subjected to corona treatment.
  • PVA-based resin obtained by mixing polyvinyl alcohol (degree of polymerization: 4200, degree of saponification: 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOSEFIMER”) at a weight ratio of 9:1.
  • the finally obtained polarizing film is placed in a dyeing bath (iodine aqueous solution obtained by blending iodine and potassium iodide at a weight ratio of 1:7 with respect to 100 parts by weight of water) at a liquid temperature of 30 ° C. It was immersed for 60 seconds while adjusting the concentration so that the single transmittance (Ts) was a desired value (dyeing treatment). Next, it was immersed for 30 seconds in a cross-linking bath at a liquid temperature of 40°C (an aqueous solution of boric acid obtained by blending 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with respect to 100 parts by weight of water).
  • crosslinking treatment After that, while immersing the laminate in an aqueous solution of boric acid (boric acid concentration: 4% by weight, potassium iodide concentration: 5% by weight) at a liquid temperature of 70° C., the laminate is moved vertically (longitudinally) between rolls with different peripheral speeds. Uniaxial stretching was performed so that the stretching ratio was 5.5 times (underwater stretching treatment). After that, the laminated body was immersed in a washing bath (aqueous solution obtained by blending 4 parts by weight of potassium iodide with 100 parts by weight of water) at a liquid temperature of 20° C. (washing treatment).
  • a washing bath aqueous solution obtained by blending 4 parts by weight of potassium iodide with 100 parts by weight of water
  • a polycarbonate film having a hard coat (HC) layer formed thereon was laminated as a protective layer to the polarizing film side of the obtained laminate via an ultraviolet curable adhesive (having a thickness of 1.5 ⁇ m after curing). Thereafter, the resin substrate was peeled off from the polarizing film to obtain a polarizing plate having a structure of HC layer/polycarbonate film/adhesive layer/polarizing film.
  • the polycarbonate film on which the HC layer was formed (170 g/m 2 ⁇ 24 h at 40 ° C. and 92% RH) was obtained by adding the following hard coat layer forming material to the following polycarbonate film (thickness 13 ⁇ m). A is applied and heated at 60° C.
  • the coated layer after heating is irradiated with ultraviolet light with an integrated light amount of 250 mJ/cm 2 from a high-pressure mercury lamp to cure the coated layer to form an HC layer with a thickness of 2 ⁇ m.
  • the pressure inside the reaction vessel is increased to 6.67 kPa
  • the heating tank temperature is raised to 230°C in 15 minutes, and the generated phenol is reacted. It was pulled out of the container.
  • the stirring torque of the stirrer increased, the temperature was raised to 250°C in 8 minutes, and the pressure in the reaction vessel was made to reach 0.200 kPa or less in order to remove the generated phenol.
  • the reaction was terminated, and the produced reactant was extruded into water to obtain polycarbonate copolymer pellets.
  • the obtained pellets a single screw extruder (manufactured by Isuzu Kakoki Co., Ltd., screw diameter 25 mm, cylinder set temperature: 220 ° C.), T die (width 200 mm, set temperature: 220 ° C.), chill roll (set temperature: 120 ⁇ 130° C.) and a film-forming apparatus equipped with a winder to obtain a polycarbonate-based film.
  • Polymerizable liquid crystal exhibiting a nematic liquid crystal phase (manufactured by BASF: trade name “Paliocolor LC242”, represented by the following formula) 10 g, and a photopolymerization initiator for the polymerizable liquid crystal compound (manufactured by BASF: trade name “Irgacure 907 ”) was dissolved in 40 g of toluene to prepare a liquid crystal composition (coating liquid).
  • the surface of a polyethylene terephthalate (PET) film was rubbed with a rubbing cloth and subjected to orientation treatment.
  • the direction of the orientation treatment was set at 15° to the direction of the absorption axis of the polarizing film when viewed from the viewing side when the film was attached to the polarizing plate.
  • the above liquid crystal coating solution was applied to the alignment-treated surface using a bar coater, and dried by heating at 90° C. for 2 minutes to align the liquid crystal compound.
  • the liquid crystal layer thus formed is irradiated with light of 1 mJ/cm 2 using a metal halide lamp to cure the liquid crystal layer, thereby forming a liquid crystal alignment fixed layer A (H layer) on the PET film. bottom.
  • a liquid crystal alignment fixed layer B (Q layer) was formed.
  • Example 2 A polarizing plate with a retardation layer was obtained in the same manner as in Example 1, except that the thickness of the HC layer was 5 ⁇ m.
  • Example 3 A polarizing plate with a retardation layer was obtained in the same manner as in Example 1, except that a COP film having an HC layer formed thereon was used as the protective layer.
  • the COP film on which the HC layer is formed is a cycloolefin-based unstretched film (manufactured by Nippon Zeon Co., Ltd., thickness 13 ⁇ m, moisture permeability at 40 ° C. and 92% RH 35 g / m 2 ⁇ 24 h), the following hard coat
  • the layer-forming material B is applied and heated at 60° C.
  • the coated layer after heating is irradiated with ultraviolet light with an integrated light amount of 250 mJ/cm 2 from a high-pressure mercury lamp to cure the coated layer, resulting in a HC layer having a thickness of 2 ⁇ m. obtained by forming
  • Example 2 A polarizing plate with a retardation layer was obtained in the same manner as in Example 1, except that the thickness of the HC layer was 7 ⁇ m.
  • Example 3 A polarizing plate with a retardation layer was obtained in the same manner as in Example 1, except that an acrylic film having an HC layer formed thereon was used as the protective layer.
  • the acrylic film having the HC layer formed thereon was obtained by coating the acrylic film having the lactone ring structure with the hard coat layer forming material C shown below and heating at 60° C. for 1 minute.
  • An HC layer having a thickness of 5 ⁇ m was formed by curing the coating layer by irradiating the coating layer with ultraviolet light having an accumulated light quantity of 250 mJ/cm 2 from a mercury lamp.
  • Example 4 In the same manner as in Example 3, except that the COP film was changed to a cycloolefin-based unstretched film (manufactured by Nippon Zeon Co., Ltd., thickness 25 ⁇ m, moisture permeability 20 g / m 2 ⁇ 24 h at 40 ° C. and 92% RH). A layered polarizing plate was obtained.
  • a long roll of polyvinyl alcohol (PVA)-based resin film with a thickness of 30 ⁇ m (manufactured by Kuraray, product name “PE3000”) is uniaxially stretched in the longitudinal direction by a roll stretching machine so as to be 5.9 times the length while simultaneously being stretched. After swelling, dyeing, cross-linking, and washing treatments were performed in this order, a drying treatment was finally performed to prepare a polarizing film having a thickness of 12 ⁇ m. In the swelling treatment, the film was stretched 2.2 times while being treated with pure water at 20°C. Next, the dyeing treatment is performed in an aqueous solution at 30° C.
  • PVA polyvinyl alcohol
  • the cross-linking treatment employed two-step cross-linking treatment, and the first-step cross-linking treatment was performed by stretching the film 1.2 times while treating it in an aqueous solution of boric acid and potassium iodide at 40°C.
  • the boric acid content of the aqueous solution for the first-stage cross-linking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
  • the film was stretched 1.6 times while being treated in an aqueous solution of boric acid and potassium iodide at 65°C.
  • the boric acid content of the aqueous solution for the second-stage cross-linking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight.
  • the washing treatment was carried out with an aqueous potassium iodide solution at 20°C.
  • the potassium iodide content of the aqueous solution for the cleaning treatment was 2.6% by weight.
  • a drying treatment was performed at 70° C. for 5 minutes to obtain a polarizing film.
  • a TAC film having a hard coat (HC) layer formed thereon via a polyvinyl alcohol adhesive and a TAC film having a thickness of 20 ⁇ m were laminated to form an HC layer/TAC film/adhesive layer.
  • a polarizing plate having a structure of /polarizing film/adhesive layer/TAC film was obtained.
  • the TAC film (water vapor permeability at 40°C and 92% RH: 800 g/m 2 24h) on which the HC layer was formed was prepared by applying the hard coat layer-forming material C to the TAC film (thickness: 25 ⁇ m) at 60°C. After the heating, the coated layer was irradiated with ultraviolet light with an accumulated light amount of 250 mJ/cm 2 from a high-pressure mercury lamp to cure the coated layer to form an HC layer having a thickness of 7 ⁇ m.
  • the pencil hardness of the protective layer side of the obtained retardation layer-attached polarizing plate was measured under the condition of a load of 500 g. 3. Bend resistance was evaluated by the MIT test.
  • the MIT test was performed according to JIS P 8115. Specifically, the obtained polarizing plate with a retardation layer was cut into a size of 15 cm in length and 15 mm in width with a cutting machine so that the absorption axis direction of the polarizing film was the length direction to obtain a test piece. .
  • the retardation layer-equipped polarizing plate of the example had both hardness and durability.
  • Comparative Example 2-4 breakage occurred at the interface between the HC layer and the film before reaching 1000 times of bending in the MIT test.
  • Comparative Example 3 peeling occurred at the interface between the HC layer and the film in the cross-cut peeling test.
  • a polarizing plate with a retardation layer according to an embodiment of the present invention can be used in an image display device, and can be particularly suitably used in a curved, bendable, foldable, or rollable image display device.
  • Typical image display devices include liquid crystal display devices, organic EL display devices, and inorganic EL display devices.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Engineering & Computer Science (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)
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  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention concerne une plaque de polarisation équipée d'une couche de retard ayant à la fois une dureté et une durabilité contre la déformation. Une plaque de polarisation équipée d'une couche de retard selon un mode de réalisation de la présente invention comporte une couche de protection, un film polarisant, et une couche de retard dans cet ordre, la dureté de surface du côté de la couche de protection de celle-ci est de 2B ou plus en dureté de crayon, et l'épaisseur d'une partie empilée de la couche de protection à la couche de retard est de 32 µm ou moins.
PCT/JP2022/025045 2021-08-06 2022-06-23 Plaque de polarisation équipée d'une couche de retard et dispositif d'affichage d'image l'utilisant WO2023013275A1 (fr)

Priority Applications (2)

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KR1020247002440A KR20240034769A (ko) 2021-08-06 2022-06-23 위상차층 부착 편광판 및 이를 이용한 화상 표시 장치
CN202280055073.3A CN117859080A (zh) 2021-08-06 2022-06-23 带相位差层的偏振片及使用了其的图像显示装置

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JP2021130267A JP2023024150A (ja) 2021-08-06 2021-08-06 位相差層付偏光板およびそれを用いた画像表示装置
JP2021-130267 2021-08-06

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180059300A1 (en) * 2016-08-23 2018-03-01 Dongwoo Fine-Chem Co., Ltd. Polarizing plate and image display device comprising the same
JP2018205663A (ja) * 2017-06-09 2018-12-27 日東電工株式会社 位相差層付偏光板および画像表示装置
JP2019169470A (ja) * 2018-03-23 2019-10-03 東洋紡株式会社 エレクトロルミネッセンス表示装置
JP2021111363A (ja) * 2020-01-09 2021-08-02 住友化学株式会社 積層体および画像表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180059300A1 (en) * 2016-08-23 2018-03-01 Dongwoo Fine-Chem Co., Ltd. Polarizing plate and image display device comprising the same
JP2018205663A (ja) * 2017-06-09 2018-12-27 日東電工株式会社 位相差層付偏光板および画像表示装置
JP2019169470A (ja) * 2018-03-23 2019-10-03 東洋紡株式会社 エレクトロルミネッセンス表示装置
JP2021111363A (ja) * 2020-01-09 2021-08-02 住友化学株式会社 積層体および画像表示装置

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