WO2017094623A1 - Stratifié optique et dispositif d'affichage d'image - Google Patents

Stratifié optique et dispositif d'affichage d'image Download PDF

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Publication number
WO2017094623A1
WO2017094623A1 PCT/JP2016/085028 JP2016085028W WO2017094623A1 WO 2017094623 A1 WO2017094623 A1 WO 2017094623A1 JP 2016085028 W JP2016085028 W JP 2016085028W WO 2017094623 A1 WO2017094623 A1 WO 2017094623A1
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Prior art keywords
layer
polarizer
retardation
slow axis
substrate
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PCT/JP2016/085028
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English (en)
Japanese (ja)
Inventor
浩 角村
武田　健太郎
敏行 飯田
Original Assignee
日東電工株式会社
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Filing date
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to SG11201804244TA priority Critical patent/SG11201804244TA/en
Priority to CN201680070418.7A priority patent/CN108292002B/zh
Priority to KR1020187015174A priority patent/KR102627997B1/ko
Publication of WO2017094623A1 publication Critical patent/WO2017094623A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • 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
    • 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
    • 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
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Definitions

  • the present invention relates to an optical laminate and an image display device using the same.
  • the touch sensor in the input display device having the above configuration includes a sensor film including a base material and a conductive layer formed on the base material.
  • a sensor film including a base material and a conductive layer formed on the base material.
  • an isotropic base material is frequently used. If this isotropic substrate is optically completely isotropic, the antireflection function by the circularly polarizing plate is sufficiently exhibited.
  • a slight anisotropy is exhibited even in a base material intended for isotropic properties due to the influence of the conductive layer forming step, the treatment for increasing the toughness of the base material, and the like.
  • problems such as reflection of external light and reflection of the background are not solved.
  • the present invention has been made to solve the above-described conventional problems, and its main purpose is to provide an antireflection function while having an optically anisotropic base material (hereinafter also referred to as an anisotropic base material).
  • An object of the present invention is to provide an optical layered body that is excellent in performance.
  • the optical layered body of the present invention has a polarizing plate including a polarizer and a protective layer disposed on at least one side of the polarizer, a retardation layer, a conductive layer, and a base material in this order.
  • the in-plane retardation Re (550) of the material is larger than 0 nm, and the angle formed by the slow axis of the substrate and the slow axis of the retardation layer is ⁇ 40 ° to ⁇ 50 ° or 40 ° to 50 °. It is.
  • an angle formed by the absorption axis of the polarizer and the slow axis of the retardation layer is 38 ° to 52 °.
  • Re (450) / Re (550) of the retardation layer is 0.8 or more and less than 1. In one embodiment, Re (650) / Re (550) of the retardation layer is greater than 1 and 1.2 or less. In one embodiment, the retardation layer is made of a polycarbonate system. According to another aspect of the present invention, an image display device is provided.
  • the image display device includes the optical laminate.
  • the present invention by optimizing the slow axis angle of the anisotropic base material, it is possible to provide an optical layered body having an antireflection function while having an anisotropic base material.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
  • In-plane retardation (Re) “Re ( ⁇ )” is an in-plane retardation measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Re (550) is an in-plane retardation measured with light having a wavelength of 550 nm at 23 ° C.
  • Thickness direction retardation (Rth) is a retardation in the thickness direction measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Rth (550) is a retardation in the thickness direction measured with light having a wavelength of 550 nm at 23 ° C.
  • FIG. 1 is a schematic cross-sectional view of an optical laminate according to one embodiment of the present invention.
  • the optical laminated body 100 of this embodiment has the polarizing plate 11, the phase difference layer 12, the conductive layer 21, and the base material 22 in this order.
  • the polarizing plate 11 includes a polarizer 1, a first protective layer 2 disposed on one side of the polarizer 1, and a second protective layer 3 disposed on the other side of the polarizer 1. .
  • one of the first protective layer 2 and the second protective layer 3 may be omitted.
  • the retardation layer 12 can also function as a protective layer for the polarizer 1
  • the second protective layer 3 may be omitted.
  • Each of the conductive layer 21 and the base material 22 may be a component of the optical laminate 100 as a single layer, or may be introduced into the optical laminate 100 as a laminate of the base material 22 and the conductive layer 21.
  • the laminated body of the base material 22 and the conductive layer 21 can function as the sensor film 20 of the touch sensor, for example.
  • the ratio of the thickness of each layer in drawing differs from actual.
  • each layer which comprises an optical laminated body may be laminated
  • the base material 22 may be adhered and laminated on the conductive layer 21.
  • “adhesion lamination” means that two layers are directly and firmly laminated without an adhesive layer (for example, an adhesive layer or an adhesive layer).
  • the laminate 10 of the polarizing plate 11 and the retardation layer 12 can function as a circularly polarizing plate.
  • the substrate 22 can be optically anisotropic.
  • the angle formed between the slow axis of the base material 22 and the retardation layer 12 is within a specific range (as described later, ⁇ 40 ° to ⁇ 50 °). Or 40 ° to 50 °) can provide an optical laminate that sufficiently exhibits the antireflection function of the circularly polarizing plate and can effectively prevent external light reflection, background reflection, and the like.
  • the base material 22 has an in-plane retardation (for example, the in-plane retardation Re (550) is larger than 0 nm and not larger than 10 nm). Details will be described later.
  • the total thickness of the optical laminate is preferably 220 ⁇ m or less, more preferably 40 ⁇ m to 180 ⁇ m.
  • the optical layered body may have a long shape (for example, a roll shape) or a single wafer shape.
  • Polarizing plate B-1 Polarizer Any appropriate polarizer may be adopted as the polarizer 1.
  • the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
  • polarizers composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and ethylene / vinyl acetate copolymer partially saponified films.
  • PVA polyvinyl alcohol
  • polyene-based oriented films such as those subjected to dyeing treatment and stretching treatment with dichroic substances such as iodine and dichroic dyes, PVA dehydrated products and polyvinyl chloride dehydrochlorinated products.
  • a polarizer obtained by dyeing a PVA film with iodine and uniaxially stretching is used because of excellent optical properties.
  • the dyeing with iodine is performed, for example, by immersing a PVA film in an aqueous iodine solution.
  • the stretching ratio of the uniaxial stretching is preferably 3 to 7 times.
  • the stretching may be performed after the dyeing treatment or may be performed while dyeing. Moreover, you may dye
  • the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing the PVA film in water and washing it before dyeing, not only can the surface of the PVA film be cleaned of dirt and anti-blocking agents, but the PVA film can be swollen to cause uneven staining. Can be prevented.
  • a polarizer obtained by using a laminate a laminate of a resin substrate and a PVA resin layer (PVA resin film) laminated on the resin substrate, or a resin substrate and the resin
  • a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate examples thereof include a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate.
  • a polarizer obtained by using a laminate of a resin base material and a PVA resin layer applied and formed on the resin base material may be obtained by, for example, applying a PVA resin solution to a resin base material and drying it.
  • a PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; the laminate is stretched and dyed to make the PVA-based resin layer a polarizer; obtain.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching.
  • the stretching may further include, if necessary, stretching the laminate in the air at a high temperature (for example, 95 ° C. or higher) before stretching in the aqueous boric acid solution.
  • the obtained resin base material / polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), and the resin base material is peeled from the resin base material / polarizer laminate.
  • Any appropriate protective layer according to the purpose may be laminated on the release surface. Details of a method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. This publication is incorporated herein by reference in its entirety.
  • the thickness of the polarizer is preferably 15 ⁇ m or less, more preferably 1 ⁇ m to 12 ⁇ m, still more preferably 3 ⁇ m to 12 ⁇ m, and particularly preferably 5 ⁇ m to 12 ⁇ m.
  • the boric acid content of the polarizer is preferably 18% by weight or more, more preferably 18% by weight to 25% by weight. If the content of boric acid in the polarizer is in such a range, the ease of curling adjustment at the time of bonding is well maintained and the curling at the time of heating is achieved by a synergistic effect with the iodine content described later. It is possible to improve the appearance durability during heating while satisfactorily suppressing.
  • the boric acid content can be calculated as the amount of boric acid contained in the polarizer per unit weight using, for example, the following formula from the neutralization method.
  • the iodine content of the polarizer is preferably 2.1% by weight or more, more preferably 2.1% by weight to 3.5% by weight. If the iodine content of the polarizer is in this range, the curl adjustment at the time of bonding is well maintained and the curl at the time of heating is maintained by a synergistic effect with the boric acid content. It is possible to improve the appearance durability during heating while satisfactorily suppressing.
  • iodine content means the amount of all iodine contained in a polarizer (PVA resin film).
  • iodine exists in the form of iodine ions (I ⁇ ), iodine molecules (I 2 ), polyiodine ions (I 3 ⁇ , I 5 ⁇ ), etc. in the polarizer.
  • Iodine content means the amount of iodine encompassing all these forms.
  • the iodine content can be calculated, for example, by a calibration curve method of fluorescent X-ray analysis.
  • the polyiodine ion exists in a state where a PVA-iodine complex is formed in the polarizer. By forming such a complex, absorption dichroism can be developed in the wavelength range of visible light.
  • the complex of PVA and triiodide ions (PVA ⁇ I 3 ⁇ ) has an absorption peak around 470 nm, and the complex of PVA and pentaiodide ions (PVA ⁇ I 5 ⁇ ) is around 600 nm. Have an absorption peak.
  • polyiodine ions can absorb light in a wide range of visible light depending on their form.
  • iodine ion (I ⁇ ) has an absorption peak near 230 nm and is not substantially involved in the absorption of visible light. Therefore, polyiodine ions present in a complex state with PVA can be mainly involved in the absorption performance of the polarizer.
  • the polarizer preferably exhibits absorption dichroism at any wavelength between 380 nm and 780 nm.
  • the single transmittance of the polarizer is 43.0% to 46.0%, preferably 44.5% to 46.0%.
  • the polarization degree of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and further preferably 99.9% or more.
  • the first protective layer 2 is formed of any suitable film that can be used as a protective layer for a polarizer.
  • the material as the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based materials.
  • transparent resins such as polystyrene, polynorbornene, polyolefin, (meth) acryl, and acetate.
  • thermosetting resins such as (meth) acrylic, urethane-based, (meth) acrylurethane-based, epoxy-based, and silicone-based or ultraviolet curable resins are also included.
  • a glassy polymer such as a siloxane polymer is also included.
  • a polymer film described in JP-A-2001-343529 (WO01 / 37007) can also be used.
  • a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in the side chain for example, a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer can be mentioned.
  • the polymer film can be, for example, an extruded product of the resin composition.
  • the optical layered body of the present invention is typically disposed on the viewing side of the image display device, and the first protective layer 2 is typically disposed on the viewing side.
  • the first protective layer 2 may be subjected to a surface treatment such as a hard coat treatment, an antireflection treatment, an antisticking treatment, and an antiglare treatment as necessary.
  • the first protective layer 2 may be provided with a treatment for improving visibility when viewed through polarized sunglasses (typically, an (elliptical) circular polarization function, (Giving an ultrahigh phase difference) may be applied.
  • polarized sunglasses typically, an (elliptical) circular polarization function, (Giving an ultrahigh phase difference
  • the optical laminate can be suitably applied to an image display device that can be used outdoors.
  • the thickness of the first protective layer is, for example, 10 ⁇ m to 50 ⁇ m, preferably 15 ⁇ m to 40 ⁇ m.
  • the thickness of the first protective layer is a thickness including the thickness of the surface treatment layer.
  • the second protective layer 3 is also formed of any suitable film that can be used as a protective layer for the polarizer.
  • the material constituting the main component of the film is as described in the section B-2 regarding the first protective layer.
  • the second protective layer 3 is preferably optically substantially isotropic.
  • “optically substantially isotropic” means that the in-plane retardation Re (550) is 0 nm to 10 nm and the thickness direction retardation Rth (550) is ⁇ 10 nm to +10 nm.
  • the thickness of the second protective layer is, for example, 15 ⁇ m to 35 ⁇ m, preferably 20 ⁇ m to 30 ⁇ m.
  • the difference between the thickness of the first protective layer and the thickness of the second protective layer is preferably 15 ⁇ m or less, more preferably 10 ⁇ m or less. If the difference in thickness is within such a range, curling at the time of bonding can be satisfactorily suppressed.
  • the thickness of the first protective layer and the thickness of the second protective layer may be the same, the first protective layer may be thicker, and the second protective layer may be thicker. . Typically, the first protective layer is thicker than the second protective layer.
  • the retardation layer 12 may have any suitable optical and / or mechanical properties depending on the purpose.
  • the retardation layer 12 typically has a slow axis.
  • the angle ⁇ formed by the slow axis of the retardation layer 12 and the absorption axis of the polarizer 1 is preferably 38 ° to 52 °, more preferably 42 ° to 48 °. More preferably, it is about 45 °. If the angle ⁇ is within such a range, an optical element having a very excellent circular polarization characteristic (as a result, a very good antireflection characteristic) by using a retardation layer as a ⁇ / 4 plate as will be described later. A laminate can be obtained.
  • the phase difference layer preferably has a refractive index characteristic of nx> ny ⁇ nz.
  • the retardation layer is typically provided for imparting antireflection properties to the polarizing plate, and can function as a ⁇ / 4 plate in one embodiment.
  • the in-plane retardation Re (550) of the retardation layer is preferably 80 nm to 200 nm, more preferably 100 nm to 180 nm, and still more preferably 110 nm to 170 nm.
  • the Nz coefficient of the retardation layer is preferably 0.1 to 3, more preferably 0.2 to 1.5, and still more preferably 0.3 to 1.3. By satisfying such a relationship, a very excellent reflection hue can be achieved when the obtained optical laminate is used in an image display device.
  • the retardation layer may exhibit reverse dispersion wavelength characteristics in which the retardation value increases with the wavelength of the measurement light, or may exhibit positive wavelength dispersion characteristics in which the retardation value decreases with the wavelength of the measurement light.
  • the phase difference value may exhibit a flat chromatic dispersion characteristic that hardly changes depending on the wavelength of the measurement light.
  • the retardation layer exhibits reverse dispersion wavelength characteristics.
  • Re (450) / Re (550) of the retardation layer is preferably 0.8 or more and less than 1, and more preferably 0.8 or more and 0.95 or less.
  • Re (650) / Re (550) of the retardation layer is preferably larger than 1 and 1.2 or less, more preferably 1.05 or more and 1.2 or less.
  • the wavelength dispersion characteristics of the retardation layer can be controlled, for example, by using a polycarbonate resin film as a resin film and adjusting the content ratio of the structural units constituting the polycarbonate resin as described later. it can.
  • the absolute value of photoelastic coefficient of preferably 2 ⁇ 10 -11 m 2 / N or less, more preferably 2.0 ⁇ 10 -13 m 2 /N ⁇ 1.5 ⁇ 10 -11 m 2 / N, more preferably includes a resin of 1.0 ⁇ 10 -12 m 2 /N ⁇ 1.2 ⁇ 10 -11 m 2 / N.
  • the thickness of the retardation layer is preferably 60 ⁇ m or less, and preferably 30 ⁇ m to 55 ⁇ m. If the thickness of the retardation layer is in such a range, curling at the time of bonding can be adjusted well while curling at the time of heating is suppressed satisfactorily.
  • the retardation layer can be composed of any appropriate resin film that can satisfy the above-described characteristics.
  • Typical examples of such resins include cyclic olefin resins, polycarbonate resins, cellulose resins, polyester resins, polyvinyl alcohol resins, polyamide resins, polyimide resins, polyether resins, polystyrene resins, acrylic resins. Based resins.
  • a polycarbonate-based resin can be suitably used.
  • the polycarbonate resin any appropriate polycarbonate resin can be used as long as the effects of the present invention can be obtained.
  • the polycarbonate resin includes a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, an alicyclic diol, an alicyclic dimethanol, di, tri, or polyethylene glycol, and an alkylene.
  • the polycarbonate resin is derived from a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, a structural unit derived from an alicyclic dimethanol and / or a di-, tri- or polyethylene glycol. More preferably, a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and a structural unit derived from di, tri, or polyethylene glycol.
  • the polycarbonate resin may contain structural units derived from other dihydroxy compounds as necessary. Details of the polycarbonate resin that can be suitably used in the present invention are described in, for example, Japanese Patent Application Laid-Open Nos. 2014-10291 and 2014-26266, and the description is incorporated herein by reference. The
  • the glass transition temperature of the polycarbonate resin is preferably 120 ° C. or higher and 190 ° C. or lower, more preferably 130 ° C. or higher and 180 ° C. or lower. If the glass transition temperature is excessively low, the heat resistance tends to deteriorate, there is a possibility of causing a dimensional change after film formation, and the image quality of the obtained image display device may be lowered. If the glass transition temperature is excessively high, the molding stability at the time of film molding may deteriorate, and the transparency of the film may be impaired.
  • the glass transition temperature is determined according to JIS K 7121 (1987).
  • the molecular weight of the polycarbonate resin can be represented by a reduced viscosity.
  • the reduced viscosity is measured using a Ubbelohde viscometer at a temperature of 20.0 ° C. ⁇ 0.1 ° C., using methylene chloride as a solvent, precisely adjusting the polycarbonate concentration to 0.6 g / dL.
  • the lower limit of the reduced viscosity is usually preferably 0.30 dL / g, more preferably 0.35 dL / g or more.
  • the upper limit of the reduced viscosity is usually preferably 1.20 dL / g, more preferably 1.00 dL / g, still more preferably 0.80 dL / g.
  • the reduced viscosity is less than the lower limit, there may be a problem that the mechanical strength of the molded product is reduced.
  • the reduced viscosity is larger than the upper limit, the fluidity at the time of molding is lowered, and there may be a problem that productivity and moldability are lowered.
  • a commercially available film may be used as the polycarbonate resin film.
  • Specific examples of commercially available products include “Pure Ace WR-S”, “Pure Ace WR-W”, “Pure Ace WR-M” manufactured by Teijin Limited, and “NRF” manufactured by Nitto Denko Corporation. It is done.
  • the retardation layer is obtained, for example, by stretching a film formed from the polycarbonate resin.
  • Any appropriate molding method can be adopted as a method of forming a film from a polycarbonate-based resin. Specific examples include compression molding methods, transfer molding methods, injection molding methods, extrusion molding methods, blow molding methods, powder molding methods, FRP molding methods, cast coating methods (for example, casting methods), calendar molding methods, and hot presses. Law. Extrusion molding or cast coating is preferred. This is because the smoothness of the resulting film can be improved and good optical uniformity can be obtained.
  • the molding conditions can be appropriately set according to the composition and type of the resin used, the properties desired for the retardation layer, and the like. In addition, as above-mentioned, since many film products are marketed for polycarbonate-type resin, you may use the said commercial film as it is for a extending
  • the thickness of the resin film can be set to any appropriate value depending on the desired thickness of the retardation layer, the desired optical properties, the stretching conditions described below, and the like.
  • the thickness is preferably 50 ⁇ m to 300 ⁇ m.
  • Any appropriate stretching method and stretching conditions may be employed for the stretching.
  • various stretching methods such as free end stretching, fixed end stretching, free end contraction, and fixed end contraction can be used singly or simultaneously or sequentially.
  • the stretching direction can also be performed in various directions and dimensions such as a length direction, a width direction, a thickness direction, and an oblique direction.
  • the stretching temperature is preferably Tg-30 ° C to Tg + 60 ° C, more preferably Tg-30 ° C to Tg + 50 ° C, and more preferably Tg-15 ° C to Tg + 30 with respect to the glass transition temperature (Tg) of the resin film. More preferably, the temperature is C.
  • a retardation film having the desired optical characteristics (for example, refractive index characteristics, in-plane retardation, Nz coefficient) can be obtained by appropriately selecting the stretching method and stretching conditions.
  • the retardation film is produced by uniaxially stretching a resin film or uniaxially stretching a fixed end.
  • the fixed end uniaxial stretching there is a method of stretching in the width direction (lateral direction) while running the resin film in the longitudinal direction.
  • the draw ratio is preferably 1.1 to 3.5 times.
  • the retardation film can be produced by continuously stretching a long resin film obliquely in the direction of the angle ⁇ described above with respect to the longitudinal direction.
  • a long stretched film having an orientation angle of ⁇ with respect to the longitudinal direction of the film (slow axis in the direction of angle ⁇ ) can be obtained.
  • the angle ⁇ may be an angle formed between the absorption axis of the polarizer and the slow axis of the retardation layer in the polarizing plate with the retardation layer.
  • the angle ⁇ is preferably 38 ° to 52 °, more preferably 42 ° to 48 °, and further preferably about 45 °.
  • Examples of the stretching machine used for the oblique stretching include a tenter type stretching machine capable of adding feed forces, pulling forces, or pulling forces at different speeds in the lateral and / or longitudinal directions.
  • the tenter type stretching machine includes a horizontal uniaxial stretching machine, a simultaneous biaxial stretching machine, and the like, but any suitable stretching machine can be used as long as a long resin film can be continuously stretched obliquely.
  • the retardation layer having the desired in-plane retardation and having the slow axis in the desired direction (substantially long) Shaped retardation film) can be obtained.
  • the stretching temperature of the film can vary depending on the in-plane retardation value and thickness desired for the retardation layer, the type of resin used, the thickness of the film used, the stretching ratio, and the like. Specifically, the stretching temperature is preferably Tg-30 ° C to Tg + 60 ° C, more preferably Tg-30 ° C to Tg + 50 ° C, and further preferably Tg-15 ° C to Tg + 30 ° C. By stretching at such a temperature, a retardation layer having appropriate characteristics in the present invention can be obtained. Tg is the glass transition temperature of the constituent material of the film.
  • the conductive layer can be formed on a metal oxide film on any suitable substrate by any suitable film formation method (eg, vacuum deposition, sputtering, CVD, ion plating, spraying, etc.). Can be formed. After film formation, heat treatment (for example, 100 ° C. to 200 ° C.) may be performed as necessary. By performing the heat treatment, the amorphous film can be crystallized.
  • suitable film formation method eg, vacuum deposition, sputtering, CVD, ion plating, spraying, etc.
  • heat treatment for example, 100 ° C. to 200 ° C.
  • the metal oxide include indium oxide, tin oxide, zinc oxide, indium-tin composite oxide, tin-antimony composite oxide, zinc-aluminum composite oxide, and indium-zinc composite oxide.
  • the indium oxide may be doped with divalent metal ions or tetravalent metal ions.
  • Indium composite oxides are preferable, and indium-tin composite oxide (ITO) is more preferable.
  • Indium composite oxides are characterized by high transmittance (for example, 80% or more) in the visible light region (380 nm to 780 nm) and low surface resistance per unit area.
  • the thickness of the conductive layer is preferably 50 nm or less, more preferably 35 nm or less.
  • the lower limit of the thickness of the conductive layer is preferably 10 nm.
  • the surface resistance value of the conductive layer is preferably 300 ⁇ / ⁇ or less, more preferably 150 ⁇ / ⁇ or less, and further preferably 100 ⁇ / ⁇ or less.
  • the conductive layer can be patterned as needed. By conducting the patterning, a conductive portion and an insulating portion can be formed. Any appropriate method can be adopted as the patterning method. Specific examples of the patterning method include a wet etching method and a screen printing method.
  • the substrate has a slow axis.
  • a base material having a slow axis that is, an anisotropic base material
  • the antireflection function of the circularly polarizing plate is sufficiently exerted to effectively prevent reflection of external light and reflection of the background.
  • An optical layered body that can be provided can be provided. Therefore, according to the present invention, there is no need to select a material constituting the base material with emphasis on optical isotropy as in the prior art, and various materials can be selected according to desired characteristics. .
  • the base material is inevitably optically isotropic (in-plane retardation Re (550) is 0 nm) as a target, but is inevitably a base material having a slow axis.
  • a conductive layer is formed on a base material (ie, when the base material and the conductive layer are stacked by close-contact lamination), a slow axis that is unnecessary for the base material due to heating in the film forming process, etc. May occur.
  • the slow axis produced in this way hinders the antireflection function of the circularly polarizing plate, and is usually difficult to control the direction, which causes a decrease in production stability.
  • the antireflection function of the circularly polarizing plate is sufficiently exhibited even with the base material on which the slow axis is generated.
  • the above effect can be obtained by optimizing the angle between the slow axis of the substrate and the slow axis of the retardation layer.
  • the present invention is particularly useful in that the antireflection function of the circularly polarizing plate is sufficiently exhibited regardless of the direction of the slow axis of the substrate.
  • the angle formed between the slow axis of the substrate and the slow axis of the retardation layer is ⁇ 40 ° to ⁇ 50 ° or 40 ° to 50 °, preferably ⁇ 42 ° to ⁇ 48 ° or 42 ° to 48. °, more preferably -44 ° to -46 ° or 44 ° to 46 °, and particularly preferably -45 ° or 45 °. If it is such a range, the reflection preventing function of a circularly-polarizing plate will fully be exhibited, and the optical laminated body which can prevent external light reflection, a background reflection, etc. effectively can be provided.
  • the angle in the clockwise direction with respect to the slow axis of the substrate is defined as a positive angle
  • the angle in the counterclockwise direction is defined as a negative angle.
  • the base material preferably has a refractive index characteristic of nx> ny ⁇ nz.
  • the in-plane retardation Re (550) of the substrate is greater than 0 nm. According to the present invention, even when a substrate having an in-plane retardation Re is used, an optical laminate that sufficiently exhibits the antireflection function of the circularly polarizing plate can be obtained as described above.
  • the in-plane retardation Re (550) of the substrate is 3 nm or more. In another embodiment, the in-plane retardation Re (550) of the substrate is 5 nm or more.
  • the upper limit of the in-plane retardation Re (550) of the substrate is, for example, 10 nm. When the in-plane retardation Re (550) of the substrate is 10 nm or less (more preferably 8 nm or less, and even more preferably 6 nm or less), the antireflection function of the circularly polarizing plate is further enhanced.
  • any appropriate resin film can be used as the substrate.
  • the constituent material include a cyclic olefin resin, a polycarbonate resin, a cellulose resin, a polyester resin, and an acrylic resin.
  • the thickness of the substrate is preferably 10 ⁇ m to 200 ⁇ m, more preferably 20 ⁇ m to 60 ⁇ m.
  • a hard coat layer (not shown) may be provided between the conductive layer 21 and the base material 22.
  • a hard coat layer having any appropriate configuration can be used.
  • the thickness of the hard coat layer is, for example, 0.5 ⁇ m to 2 ⁇ m. If the haze is in an allowable range, fine particles for reducing Newton rings may be added to the hard coat layer.
  • the anchor coat layer for improving the adhesion of the conductive layer and / or the reflectance is adjusted between the conductive layer 21 and the base material 22 (a hard coat layer if present).
  • a refractive index adjustment layer may be provided. Arbitrary appropriate structures may be employ
  • the anchor coat layer and the refractive index adjusting layer can be thin layers of several nm to several tens of nm.
  • another hard coat layer may be provided on the side of the base material 22 opposite to the conductive layer 21 (outermost side of the optical laminate).
  • the hard coat layer typically includes a binder resin layer and spherical particles, and the spherical particles protrude from the binder resin layer to form convex portions. Details of such a hard coat layer are described in JP-A-2013-145547, and the description of the gazette is incorporated herein by reference.
  • optical layered body may further include other layers.
  • an adhesive layer (not shown) for bonding to the display cell is provided on the surface of the base material 22. It is preferable that a release film is bonded to the surface of the pressure-sensitive adhesive layer until the optical layered body is used.
  • the optical layered body described in the items A to F can be applied to an image display device. Therefore, the present invention includes an image display device using such an optical laminate. Typical examples of the image display device include a liquid crystal display device and an organic EL display device.
  • An image display device according to an embodiment of the present invention includes the optical layered body described in the items A to G on the viewing side.
  • the optical laminated body is laminated so that the conductive layer is on the display cell (for example, liquid crystal cell, organic EL cell) side (so that the polarizer is on the viewing side).
  • the image display device can be a so-called inner touch panel type input display device in which a touch sensor is incorporated between a display cell (for example, a liquid crystal cell or an organic EL cell) and a polarizing plate.
  • the touch sensor can be disposed between the conductive layer (or the conductive layer with the base material) and the display cell.
  • a configuration well known in the industry can be adopted, and a detailed description thereof will be omitted.
  • Example 1 About the optical laminated body of the structure shown in following Table 1, the reflection characteristic of this optical laminated body was evaluated from front hue a and b using the optical simulator (The product name "LCD Master V8" by Shintec).
  • a light source (D65 light source registered in “LCD Master V8”) is disposed on the side opposite to the retardation layer of the polarizing plate, and a reflector (“LCD” is disposed on the side opposite to the retardation layer of the substrate.
  • An ideal reflector (Idea-Reflector) registered in “Master V8” is arranged.
  • the front hues a and b were obtained in the same configuration as in Table 1 except that the base material was not included, and the result was used as a reference. In this evaluation, simulation is performed by changing the slow axis angle of the substrate as described later, and the reflection characteristics of the optical laminate are evaluated by comparison with a reference.
  • Example 1-1 The angle formed by the slow axis of the substrate and the absorption axis of the polarizer of the polarizing plate was 90 °. That is, the angle formed by the slow axis of the substrate and the slow axis of the retardation layer was 45 °.
  • Example 1-2 The angle formed by the slow axis of the substrate and the absorption axis of the polarizer of the polarizing plate was 0 °. That is, the angle formed by the slow axis of the substrate and the slow axis of the retardation layer was ⁇ 45 °.
  • Example 1-3 The angle formed by the slow axis of the substrate and the absorption axis of the polarizer of the polarizing plate was 85 °. That is, the angle formed by the slow axis of the substrate and the slow axis of the retardation layer was 40 °.
  • Example 1-4 The angle formed by the slow axis of the substrate and the absorption axis of the polarizer of the polarizing plate was 95 °. That is, the angle formed by the slow axis of the substrate and the slow axis of the retardation layer was 50 °.
  • Example 1-5 The angle formed between the slow axis of the substrate and the absorption axis of the polarizer of the polarizing plate was ⁇ 5 °. That is, the angle formed by the slow axis of the base material and the slow axis of the retardation layer was ⁇ 50 °.
  • Example 1-6 The angle formed between the slow axis of the substrate and the absorption axis of the polarizer of the polarizing plate was 5 °. That is, the angle formed by the slow axis of the substrate and the slow axis of the retardation layer was ⁇ 40 °.
  • FIG. 2 shows a plot of front hues a and b for the results of Example 1 and Comparative Example 1.
  • the optical laminate of the present invention has an excellent antireflection function.
  • Re (550) of the retardation layer is set to 139 nm
  • chromatic dispersion characteristics Re (550) / Re (450) of the retardation layer is set to 0.85
  • chromatic dispersion characteristics Re (650) / Re (550) is set to 1.06.
  • the reflective properties of the optical laminate were evaluated in the same manner as in Example 1 (Examples 1-1 to 1-6).
  • Re (550) of the retardation layer is set to 139 nm
  • chromatic dispersion characteristics Re (550) / Re (450) of the retardation layer is set to 0.85
  • chromatic dispersion characteristics Re (650) / Re (550) is set to 1.06. Except for the above, the reflective properties of the optical laminate were evaluated in the same manner as in Comparative Example 2.
  • FIG. 4 is a graph showing the axial angle dependence of ⁇ ab for the results of Example 2 and Comparative Example 2.
  • Example 3 Example 1 (Example) except that the wavelength dispersion characteristics Re (550) / Re (450) of the retardation layer is set to 0.82 and the wavelength dispersion characteristics Re (650) / Re (550) is set to 1.08.
  • the reflection characteristics of the optical laminate were evaluated in the same manner as in 1-1 to 1-6).
  • Comparative Example 3 The same as Comparative Example 2 except that the chromatic dispersion characteristic Re (550) / Re (450) of the retardation layer was set to 0.82, and the chromatic dispersion characteristic Re (650) / Re (550) was set to 1.08. Then, the reflection characteristics of the optical laminate were evaluated.
  • FIG. 5 is a graph showing the axial angle dependence of ⁇ ab for the results of Example 3 and Comparative Example 3.
  • the optical layered body of the present invention is suitably used for image display devices such as liquid crystal display devices and organic EL display devices, and can be particularly suitably used as an antireflection film for organic EL display devices. Furthermore, the optical layered body of the present invention can be suitably used for an inner touch panel type input display device.

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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)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un stratifié optique qui a une excellente fonction antireflet malgré le fait qu'il comprend un substrat ayant une anisotropie optique (également désigné ci-après comme substrat anisotrope). Le stratifié optique comprend les éléments suivants dans cet ordre : une plaque polarisante comprenant un polariseur et une couche protectrice agencée sur au moins un côté du polariseur ; une couche de retard ; une couche conductrice ; et un substrat. Le retard dans le plan Re(550) du substrat est supérieur à 0 nm et l'angle formé par l'axe lent du substrat et l'axe lent de la couche de retard est soit de -40° à -50°, soit de 40° à 50°.
PCT/JP2016/085028 2015-12-02 2016-11-25 Stratifié optique et dispositif d'affichage d'image WO2017094623A1 (fr)

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SG11201804244TA SG11201804244TA (en) 2015-12-02 2016-11-25 Optical laminate and image display device
CN201680070418.7A CN108292002B (zh) 2015-12-02 2016-11-25 光学层叠体及图像显示装置
KR1020187015174A KR102627997B1 (ko) 2015-12-02 2016-11-25 광학 적층체 및 화상 표시 장치

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SG11201804244TA (en) 2018-06-28
KR102627997B1 (ko) 2024-01-23
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JP6695685B2 (ja) 2020-05-20
CN108292002B (zh) 2021-02-26

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