WO2017094623A1 - 光学積層体および画像表示装置 - Google Patents
光学積層体および画像表示装置 Download PDFInfo
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- 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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- layer
- polarizer
- retardation
- slow axis
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- 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
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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
-
- 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
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- 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
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- 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
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- 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
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- 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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Abstract
Description
1つの実施形態においては、上記偏光子の吸収軸と前記位相差層の遅相軸とのなす角度が38°~52°である。
1つの実施形態においては、上記位相差層のRe(450)/Re(550)が、0.8以上1未満である。
1つの実施形態においては、上記位相差層のRe(650)/Re(550)が、1より大きく1.2以下である。
1つの実施形態においては、上記位相差層が、ポリカーボネート系で構成されている。
本発明の別の局面によれば、画像表示装置が提供される。この画像表示装置は、上記光学積層体を備える。
本明細書における用語および記号の定義は下記の通りである。
(1)屈折率(nx、ny、nz)
「nx」は面内の屈折率が最大になる方向(すなわち、遅相軸方向)の屈折率であり、「ny」は面内で遅相軸と直交する方向(すなわち、進相軸方向)の屈折率であり、「nz」は厚み方向の屈折率である。
(2)面内位相差(Re)
「Re(λ)」は、23℃における波長λnmの光で測定した面内位相差である。例えば、「Re(550)」は、23℃における波長550nmの光で測定した面内位相差である。Re(λ)は、層(フィルム)の厚みをd(nm)としたとき、式:Re(λ)=(nx-ny)×dによって求められる。
(3)厚み方向の位相差(Rth)
「Rth(λ)」は、23℃における波長λnmの光で測定した厚み方向の位相差である。例えば、「Rth(550)」は、23℃における波長550nmの光で測定した厚み方向の位相差である。Rth(λ)は、層(フィルム)の厚みをd(nm)としたとき、式:Rth(λ)=(nx-nz)×dによって求められる。
(4)Nz係数
Nz係数は、Nz=Rth/Reによって求められる。
図1は、本発明の1つの実施形態による光学積層体の概略断面図である。本実施形態の光学積層体100は、偏光板11と、位相差層12と、導電層21と、基材22と、をこの順に有する。偏光板11は、偏光子1と、偏光子1の一方の側に配置された第1の保護層2と、偏光子1のもう一方の側に配置された第2の保護層3とを含む。目的に応じて、第1の保護層2および第2の保護層3の一方は省略されてもよい。例えば、位相差層12が偏光子1の保護層としても機能し得る場合には、第2の保護層3は省略されてもよい。導電層21および基材22は、それぞれが単一層として光学積層体100の構成要素とされてもよく、基材22と導電層21との積層体として光学積層体100に導入されてもよい。基材22と導電層21との積層体は、例えば、タッチセンサーのセンサーフィルム20として機能し得る。なお、見やすくするために、図面における各層の厚みの比率は、実際とは異なっている。また、光学積層体を構成する各層は、任意の適切な接着層(接着剤層または粘着剤層:図示せず)を介して積層されていてもよい。一方、基材22は、導電層21に密着積層されていてもよい。本明細書において「密着積層」とは、2つの層が接着層(例えば、接着剤層、粘着剤層)を介在することなく直接かつ固着して積層されていることをいう。
B-1.偏光子
偏光子1としては、任意の適切な偏光子が採用され得る。例えば、偏光子を形成する樹脂フィルムは、単層の樹脂フィルムであってもよく、二層以上の積層体であってもよい。
第1の保護層2は、偏光子の保護層として使用できる任意の適切なフィルムで形成される。当該フィルムの主成分となる材料の具体例としては、トリアセチルセルロース(TAC)等のセルロース系樹脂や、ポリエステル系、ポリビニルアルコール系、ポリカーボネート系、ポリアミド系、ポリイミド系、ポリエーテルスルホン系、ポリスルホン系、ポリスチレン系、ポリノルボルネン系、ポリオレフィン系、(メタ)アクリル系、アセテート系等の透明樹脂等が挙げられる。また、(メタ)アクリル系、ウレタン系、(メタ)アクリルウレタン系、エポキシ系、シリコーン系等の熱硬化型樹脂または紫外線硬化型樹脂等も挙げられる。この他にも、例えば、シロキサン系ポリマー等のガラス質系ポリマーも挙げられる。また、特開2001-343529号公報(WO01/37007)に記載のポリマーフィルムも使用できる。このフィルムの材料としては、例えば、側鎖に置換または非置換のイミド基を有する熱可塑性樹脂と、側鎖に置換または非置換のフェニル基ならびにニトリル基を有する熱可塑性樹脂を含有する樹脂組成物が使用でき、例えば、イソブテンとN-メチルマレイミドからなる交互共重合体と、アクリロニトリル・スチレン共重合体とを有する樹脂組成物が挙げられる。当該ポリマーフィルムは、例えば、上記樹脂組成物の押出成形物であり得る。
第2の保護層3もまた、偏光子の保護層として使用できる任意の適切なフィルムで形成される。当該フィルムの主成分となる材料は、第1の保護層に関して上記B-2項で説明したとおりである。第2の保護層3は、光学的に略等方性であることが好ましい。本明細書において「光学的に略等方性である」とは、面内位相差Re(550)が0nm~10nmであり、厚み方向の位相差Rth(550)が-10nm~+10nmであることをいう。
位相差層12は、目的に応じて任意の適切な光学的特性および/または機械的特性を有し得る。位相差層12は、代表的には遅相軸を有する。1つの実施形態においては、位相差層12の遅相軸と偏光子1の吸収軸とのなす角度θは、好ましくは38°~52°であり、より好ましくは42°~48°であり、さらに好ましくは約45°である。角度θがこのような範囲であれば、後述するように位相差層をλ/4板とすることにより、非常に優れた円偏光特性(結果として、非常に優れた反射防止特性)を有する光学積層体が得られ得る。
導電層は、任意の適切な成膜方法(例えば、真空蒸着法、スパッタリング法、CVD法、イオンプレーティング法、スプレー法等)により、任意の適切な基材上に、金属酸化物膜を成膜して形成され得る。成膜後、必要に応じて加熱処理(例えば、100℃~200℃)を行ってもよい。加熱処理を行うことにより、非晶質膜が結晶化し得る。金属酸化物としては、例えば、酸化インジウム、酸化スズ、酸化亜鉛、インジウム-スズ複合酸化物、スズ-アンチモン複合酸化物、亜鉛-アルミニウム複合酸化物、インジウム-亜鉛複合酸化物が挙げられる。インジウム酸化物には2価金属イオンまたは4価金属イオンがドープされていてもよい。好ましくはインジウム系複合酸化物であり、より好ましくはインジウム-スズ複合酸化物(ITO)である。インジウム系複合酸化物は、可視光領域(380nm~780nm)で高い透過率(例えば、80%以上)を有し、かつ、単位面積当たりの表面抵抗値が低いという特徴を有している。
基材は、遅相軸を有する。本発明においては、遅相軸を有する基材、すなわち、異方性基材を用いても、円偏光板の反射防止機能が十分に発揮されて、外光反射や背景の映り込み等を有効に防止し得る光学積層体を提供することができる。したがって、本発明によれば、従来のように光学的な等方性を重視して基材を構成する材料を選択する必要がなく、所望の特性に応じて多様な材料を選択することができる。
本発明の実施形態による光学積層体は、その他の層をさらに含んでいてもよい。実用的には、基材22の表面には、表示セルに貼り合わせるための粘着剤層(図示せず)が設けられている。当該粘着剤層の表面には、光学積層体が使用に供されるまで、剥離フィルムが貼り合わされていることが好ましい。
上記A項からF項に記載の光学積層体は、画像表示装置に適用され得る。したがって、本発明は、そのような光学積層体を用いた画像表示装置を包含する。画像表示装置の代表例としては、液晶表示装置、有機EL表示装置が挙げられる。本発明の実施形態による画像表示装置は、その視認側に上記A項からG項に記載の光学積層体を備える。光学積層体は、導電層が表示セル(例えば、液晶セル、有機ELセル)側となるように(偏光子が視認側となるように)積層されている。すなわち、本発明の実施形態による画像表示装置は、表示セル(例えば、液晶セル、有機ELセル)と偏光板との間にタッチセンサーが組み込まれた、いわゆるインナータッチパネル型入力表示装置であり得る。この場合、タッチセンサーは、導電層(または基材付導電層)と表示セルとの間に配置され得る。タッチセンサーの構成については業界で周知の構成が採用され得るので、詳細な説明は省略する。
下記表1に示す構成の光学積層体について、光学シミュレーター(Shintec社製、商品名「LCD Master V8」)を用い、正面色相a、bから、該光学積層体の反射特性を評価した。
なお、偏光板の位相差層とは反対側に、光源(「LCD Master V8」に登録されているD65光源)を配置し、基材の位相差層とは反対側に、反射板(「LCD Master V8」に登録されている理想反射板Idea-Reflector)を配置する構成とした。
また、基材を含まないこと以外は表1と同様の構成にて、正面色相a、bを出し、その結果をリファレンスとした。
本評価は、後述のように基材の遅相軸角度を変えてシミュレーションを行い、リファレンスとの比較により、光学積層体の反射特性を評価するものである。
基材の遅相軸と偏光板の偏光子の吸収軸とのなす角度を90°とした。すなわち、基材の遅相軸と位相差層の遅相軸とのなす角度を45°とした。
基材の遅相軸と偏光板の偏光子の吸収軸とのなす角度を0°とした。すなわち、基材の遅相軸と位相差層の遅相軸とのなす角度を-45°とした。
基材の遅相軸と偏光板の偏光子の吸収軸とのなす角度を85°とした。すなわち、基材の遅相軸と位相差層の遅相軸とのなす角度を40°とした。
基材の遅相軸と偏光板の偏光子の吸収軸とのなす角度を95°とした。すなわち、基材の遅相軸と位相差層の遅相軸とのなす角度を50°とした。
基材の遅相軸と偏光板の偏光子の吸収軸とのなす角度を-5°とした。すなわち、基材の遅相軸と位相差層の遅相軸とのなす角度を-50°とした。
基材の遅相軸と偏光板の偏光子の吸収軸とのなす角度を5°とした。すなわち、基材の遅相軸と位相差層の遅相軸とのなす角度を-40°とした。
基材の遅相軸と偏光板の偏光子の吸収軸とのなす角度を、10°~80°および100°~170°の範囲内で変更し、各角度における、反射特性を評価した。
位相差層のRe(550)を139nmとし、位相差層の波長分散特性Re(550)/Re(450)を0.85とし、波長分散特性Re(650)/Re(550)を1.06としたこと以外は、実施例1(実施例1-1~1-6)と同様にして、光学積層体の反射特性を評価した。
位相差層のRe(550)を139nmとし、位相差層の波長分散特性Re(550)/Re(450)を0.85とし、波長分散特性Re(650)/Re(550)を1.06としたこと以外は、比較例2と同様にして、光学積層体の反射特性を評価した。
位相差層の波長分散特性Re(550)/Re(450)を0.82とし、波長分散特性Re(650)/Re(550)を1.08としたこと以外は、実施例1(実施例1-1~1-6)と同様にして、光学積層体の反射特性を評価した。
位相差層の波長分散特性Re(550)/Re(450)を0.82とし、波長分散特性Re(650)/Re(550)を1.08としたこと以外は、比較例2と同様にして、光学積層体の反射特性を評価した。
2 第1の保護層
3 第2の保護層
11 偏光板
12 位相差層
21 導電層
22 基材
100 光学積層体
Claims (6)
- 偏光子と該偏光子の少なくとも片側に配置された保護層とを含む偏光板と、位相差層と、導電層と、基材とをこの順に有し、
該基材の面内位相差Re(550)が0nmより大きく、
該基材の遅相軸と該位相差層の遅相軸とのなす角度が、-40°~-50°または40°~50°である、
光学積層体。 - 前記偏光子の吸収軸と前記位相差層の遅相軸とのなす角度が38°~52°である、請求項1に記載の光学積層体。
- 前記位相差層のRe(450)/Re(550)が、0.8以上1未満である、請求項1に記載の光学積層体。
- 前記位相差層のRe(650)/Re(550)が、1より大きく1.2以下である、請求項1に記載の光学積層体。
- 前記位相差層が、ポリカーボネート系で構成されている、請求項1に記載の光学積層体。
- 請求項1に記載の光学積層体を備える、画像表示装置。
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WO2019102715A1 (ja) * | 2017-11-22 | 2019-05-31 | 日東電工株式会社 | 画像表示装置 |
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CN108292002B (zh) | 2021-02-26 |
KR102627997B1 (ko) | 2024-01-23 |
SG11201804244TA (en) | 2018-06-28 |
KR20180088817A (ko) | 2018-08-07 |
TWI729040B (zh) | 2021-06-01 |
CN108292002A (zh) | 2018-07-17 |
JP2017102287A (ja) | 2017-06-08 |
JP6695685B2 (ja) | 2020-05-20 |
TW201730601A (zh) | 2017-09-01 |
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