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WO2016035636A1 - Film de polarisation circulaire, film optique et dispositif d'affichage d'images - Google Patents

Film de polarisation circulaire, film optique et dispositif d'affichage d'images Download PDF

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Publication number
WO2016035636A1
WO2016035636A1 PCT/JP2015/073987 JP2015073987W WO2016035636A1 WO 2016035636 A1 WO2016035636 A1 WO 2016035636A1 JP 2015073987 W JP2015073987 W JP 2015073987W WO 2016035636 A1 WO2016035636 A1 WO 2016035636A1
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Prior art keywords
optically anisotropic
anisotropic layer
film
layer
retardation
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PCT/JP2015/073987
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English (en)
Japanese (ja)
Inventor
勇太 高橋
絢子 茨木
信彦 一原
永井　道夫
理恵 ▲高▼砂
森嶌　慎一
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富士フイルム株式会社
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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
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • H10K59/8793—Arrangements for polarized light emission

Definitions

  • the present invention relates to a circularly polarizing film, an optical film, and an image display device.
  • An organic electroluminescence (organic EL) display device is a self-luminous thin display device, and has advantages in display performance such as higher visibility and less viewing angle dependency than a liquid crystal display device.
  • a flexible or foldable display device has been realized by using a flexible substrate.
  • the organic EL display device has excellent characteristics as described above, but a layer having a different refractive index is laminated on the electrode using a high refractive index transparent conductive material such as ITO (indium tin oxide), Since a high metal material or the like is used, external light is reflected at the interface between them, and there may be a problem of reflection due to a decrease in contrast or internal reflection. In order to suppress such adverse effects due to external light reflection, the use of a circularly polarizing film composed of an absorption linear polarizing plate and a ⁇ / 4 plate having reverse wavelength dispersion has been proposed (for example, Patent Documents 1 to 3). .
  • the present inventors left the image display device including the circularly polarizing film described in Patent Documents 1 to 3 in a wet heat environment and examined the change in visibility. As a result, the display performance was greatly reduced. As a result, it has been found that further improvement is necessary.
  • the present invention can achieve both thinning of the device and improvement of display performance when applied to an image display device, particularly an organic EL display device, and can display an image even in a humid heat environment. It aims at providing the circularly-polarizing film which can suppress the fall of the display performance of an apparatus. Another object of the present invention is to provide an optical film including the circularly polarizing film and an image display device.
  • the present inventors have found that the above problem can be solved by using a retardation film that satisfies predetermined optical characteristics. That is, it has been found that the above object can be achieved by the following configuration.
  • a circularly polarizing film in which a polarizing layer and a retardation film are laminated includes at least an optically anisotropic layer A, an optically anisotropic layer B, and an optically anisotropic layer C.
  • the optically anisotropic layer A, the optically anisotropic layer B, and the optically anisotropic layer C are Both are formed from a composition containing a liquid crystal compound,
  • the in-plane retardation of the retardation film has a relationship of Re (450) ⁇ Re (550) ⁇ Re (650),
  • the in-plane retardation ReA of the optically anisotropic layer A at a wavelength of 550 nm and the in-plane retardation ReB of the optically anisotropic layer B at a wavelength of 550 nm satisfy the relationship of the following formulas 1 and 2:
  • Formula 2 ReA 2 ⁇ ReB ⁇ 50 nm
  • the thickness direction retardation RthA of the optically anisotropic layer A at a wavelength of 550 nm and the thickness direction retardation RthB of the optically anisotropic layer B at a wavelength of 550 nm are smaller than 0, and the
  • Retardation RthC of greater than 0 The angle formed by the absorption axis direction of the polarizing layer and the slow axis direction of the optically anisotropic layer A is 75 ° ⁇ 8 °, The angle formed by the absorption axis direction of the polarizing layer and the slow axis direction of the optically anisotropic layer B is 15 ° ⁇ 8 °, A circularly polarizing film in which the thickness of the circularly polarizing film is 100 ⁇ m or less, and the thickness of each layer included in the retardation film is 20 ⁇ m or less.
  • Re (450), Re (550), and Re (650) represent in-plane retardation values of the retardation film at wavelengths of 450 nm, 550 nm, and 650 nm, respectively.
  • the optically anisotropic layer A and the optically anisotropic layer B are layers containing a substantially vertically aligned discotic liquid crystal compound, and the optically anisotropic layer C is a substantially horizontally aligned discotic.
  • the circularly polarizing film according to (1) which is a layer containing a liquid crystal compound.
  • the optically anisotropic layer A, the optically anisotropic layer C, and the optically anisotropic layer B are laminated in this order from the side closer to the polarizing layer, and the thickness direction of the optically anisotropic layer C at a wavelength of 550 nm
  • the retardation RthC of the circularly polarizing film according to (1) or (2) which is 30 to 120 nm.
  • An optical film comprising the circularly polarizing film according to any one of (1) to (4) and a transparent protective film disposed on the circularly polarizing film.
  • An image display device comprising the circularly polarizing film according to any one of (1) to (4) or the optical film according to (5) or (6).
  • the device when applied to an image display device, in particular, an organic EL display device, the device can be made thin and the display performance can be improved, and the display performance of the image display device is deteriorated even in a humid heat environment.
  • a circularly polarizing film can be provided.
  • the optical film containing the said circularly-polarizing film and an image display apparatus can also be provided.
  • a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • “orthogonal” and “parallel” with respect to an angle shall mean a range of a strict angle ⁇ 10 °, and “identical” and “different” with respect to an angle indicate whether or not the difference is less than 5 °. It can be judged on the basis of.
  • “visible light” means 380 to 780 nm.
  • a measurement wavelength is 550 nm.
  • the “slow axis” means a direction in which the refractive index is maximum in the plane
  • the “circularly polarizing film” means a long circularly polarizing film, and unless otherwise specified, and It is used to include both circularly polarized films cut to a size that can be incorporated into an image display device.
  • cutting includes “punching” and “cutting out”.
  • tilt angle (also referred to as tilt angle) means an angle formed by a tilted liquid crystal compound with a layer plane, and the direction of the maximum refractive index in the refractive index ellipsoid of the liquid crystal compound is the layer plane. It means the maximum angle among the angles formed. Therefore, in the rod-like liquid crystal compound having positive optical anisotropy, the tilt angle means an angle formed by the major axis direction of the rod-like liquid crystal compound, that is, the director direction and the layer plane.
  • the “average tilt angle” means the average value of the tilt angles from the tilt angle at the upper interface to the lower interface of the retardation film.
  • the reverse wavelength dispersion means a property that the absolute value of the in-plane retardation becomes larger as the wavelength becomes longer.
  • Re ( ⁇ ) and Rth ( ⁇ ) represent in-plane retardation and retardation in the thickness direction at wavelength ⁇ , respectively.
  • Re ( ⁇ ) is measured by making light of wavelength ⁇ nm incident in the film normal direction in KOBRAB21ADH or WR (trade name, manufactured by Oji Scientific Instruments).
  • Rth ( ⁇ ) is calculated by the following method.
  • Rth ( ⁇ ) is Re ( ⁇ ), with the in-plane slow axis (determined by KOBRA 21ADH or WR) as the tilt axis (rotation axis) (if there is no slow axis, it is arbitrary in the film plane)
  • the light is incident at a wavelength of ⁇ nm from the inclined direction in steps of 10 degrees from the normal direction to 50 degrees on one side with respect to the film normal direction of the rotation axis of It is calculated in KOBRA 21ADH or WR based on the measured retardation value, the assumed value of the average refractive index, and the input film thickness value.
  • Re ( ⁇ ) represents a retardation value in a direction inclined by an angle ⁇ from the normal direction.
  • nx represents the refractive index in the slow axis direction in the plane
  • ny represents the refractive index in the direction perpendicular to nx in the plane
  • nz represents the refractive index in the direction perpendicular to nx and ny.
  • d represents the film thickness of the film.
  • Rth ( ⁇ ) is calculated by the following method.
  • Rth ( ⁇ ) is Re ( ⁇ )
  • the in-plane slow axis (determined by KOBRA 21ADH or WR) is the tilt axis (rotary axis) from ⁇ 50 degrees to +50 degrees with respect to the film normal direction.
  • the light of wavelength ⁇ nm is incident from each inclined direction in 10 degree steps and measured at 11 points. Based on the measured retardation value, the assumed average refractive index, and the input film thickness value, KOBRA 21ADH or Calculated by WR.
  • nx, ny, and nz are calculated in KOBRA 21ADH or WR.
  • Nz (nx ⁇ nz) / (nx ⁇ ny) is further calculated from the calculated nx, ny, and nz.
  • the circularly polarizing film 10 is a laminate in which a polarizing layer 12 and a retardation film 14 are laminated.
  • the optical retardation layer 14 includes an optically anisotropic layer A16 and an optically anisotropic layer C18 from the polarizing layer 12 side. , And an optically anisotropic layer B20 are disposed.
  • the optically anisotropic layer A16 has a so-called ⁇ / 2 plate characteristic
  • the optically anisotropic layer B20 has a so-called ⁇ / 4 plate characteristic. That is, the phase difference film 14 constitutes a so-called broadband ⁇ / 4 plate (a phase difference film that expresses a phase difference value of 1 ⁇ 4 for light of each wavelength).
  • the optically anisotropic layers are arranged in the order of the optically anisotropic layer A, the optically anisotropic layer C, and the optically anisotropic layer B from the polarizing layer side.
  • the arrangement order of the optically anisotropic layers is not limited to this configuration.
  • the optically anisotropic layer A, the optically anisotropic layer B, and the optically anisotropic layer C may be arranged in this order from the polarizing layer side.
  • the optically anisotropic layer A and the optically anisotropic layer B may be arranged in this order.
  • each member included in the circularly polarizing film will be described in detail. Below, a retardation film is first explained in full detail.
  • the retardation film is a laminate including at least the optically anisotropic layer A, the optically anisotropic layer B, and the optically anisotropic layer C.
  • the in-plane retardation of the retardation film has a relationship of Re (450) ⁇ Re (550) ⁇ Re (650). More specifically, in the retardation film, Re (450) which is an in-plane retardation value (measured at a wavelength of 450 nm) at a wavelength of 450 nm and an in-plane retardation value at a wavelength of 550 nm (measured at a wavelength of 550 nm).
  • Re (450) ⁇ Re (550) ⁇ Re (650) there is a relationship of Re (450) ⁇ Re (550) ⁇ Re (650) between a certain Re (550) and Re (650) which is the value of in-plane retardation at a wavelength of 650 nm (measured at a wavelength of 650 nm). . That is, the retardation film exhibits reverse wavelength dispersion for in-plane retardation.
  • the configuration of the retardation film showing Re (450) ⁇ Re (550) ⁇ Re (650) is not particularly limited.
  • an optically anisotropic layer satisfying Re (450) ⁇ Re (550) ⁇ Re (650) By combining two layers, wavelength dispersion of Re (450) ⁇ Re (550) ⁇ Re (650) may be expressed.
  • the thickness of each layer contained in a phase difference film is 20 micrometers or less.
  • the retardation film includes at least an optically anisotropic layer A, an optically anisotropic layer B, and an optically anisotropic layer C described later, and other layers (for example, an alignment film, an adhesive layer) ) May be included, but the thickness of each layer (all layers) constituting these retardation films is intended to be 20 ⁇ m or less. That is, the thickness of other layers (for example, an alignment film and an adhesive layer) other than the optically anisotropic layer A, the optically anisotropic layer B, and the optically anisotropic layer C is also 20 ⁇ m or less.
  • the said thickness intends average thickness, and the thickness of each layer measures the thickness of arbitrary 5 points
  • the thickness of the retardation film including at least the optically anisotropic layer A, the optically anisotropic layer B, and the optically anisotropic layer C is preferably 3 to 40 ⁇ m, more preferably 4 to 35 ⁇ m, and further preferably 5 to 30 ⁇ m. preferable.
  • the transparent protective film is not included as a member constituting the circularly polarizing film, and an embodiment including the circularly polarizing film and the transparent protective film is referred to as an optical film.
  • the optically anisotropic layer A is a layer having the characteristics of a so-called ⁇ / 2 plate, and the in-plane retardation ReA of the optically anisotropic layer A at a wavelength of 550 nm satisfies the relationship of Formula 2.
  • equation represents the in-plane retardation in wavelength 550nm of the optically anisotropic layer B mentioned later.
  • the thickness direction retardation RthA of the optically anisotropic layer A at a wavelength of 550 nm is smaller than zero. So-called negative Rth is shown.
  • the value of RthA may be negative, but is preferably ⁇ 180 to ⁇ 75 nm, more preferably ⁇ 170 to ⁇ 90 nm, from the viewpoint of better display performance of the image display device.
  • the angle formed between the absorption axis direction of the polarizing layer described later and the slow axis direction of the optically anisotropic layer A may be in the range of 75 ° ⁇ 8 °, and more preferably 75 ° ⁇ 5 °.
  • the thickness of the optically anisotropic layer A may be 20 ⁇ m or less as described above, but is preferably 0.5 to 10 ⁇ m and more preferably 0.5 to 5 ⁇ m from the viewpoint of thinning.
  • the said thickness intends average thickness, measures the thickness of the arbitrary 5 points
  • the optically anisotropic layer A is formed from a composition containing a liquid crystal compound.
  • the optically anisotropic layer A include an optically anisotropic layer obtained by forming a low-molecular liquid crystal compound in a nematic orientation in a liquid crystal state and then fixing by photocrosslinking or thermal crosslinking, or a polymer liquid crystal compound in a liquid crystal state. And an optically anisotropic layer obtained by fixing the orientation by cooling after forming into a nematic orientation.
  • the optically anisotropic layer is, for example, a layer formed by fixing a liquid crystal compound by polymerization or the like, and it is no longer necessary to exhibit liquid crystallinity after becoming a layer.
  • liquid crystal compounds can be classified into rod-shaped types (rod-shaped liquid crystal compounds) and disk-shaped types (discotic liquid crystal compounds, disk-shaped liquid crystal compounds) based on their shapes. Furthermore, there are low-molecular and high-molecular types, respectively.
  • Polymer generally refers to a polymer having a degree of polymerization of 100 or more (Polymer Physics / Phase Transition Dynamics, Masao Doi, 2 pages, Iwanami Shoten, 1992). In the present invention, any liquid crystal compound can be used. Two or more kinds of rod-like liquid crystal compounds, two or more kinds of discotic liquid crystal compounds, or a mixture of a rod-like liquid crystal compound and a discotic liquid crystal compound may be used.
  • rod-like liquid crystal compound for example, those described in JP-A-11-513019 and JP-A-2007-279688 can be preferably used, and examples of the discotic liquid crystal compound include JP-A-2007-108732. Although those described in Japanese Patent Laid-Open No. 2010-244038 can be preferably used, the invention is not limited to these.
  • the molecules of the liquid crystal compound are fixed in any alignment state of vertical alignment, horizontal alignment, hybrid alignment, and tilt alignment.
  • the disc surface of the discotic liquid crystal compound is substantially relative to the film surface (optically anisotropic layer surface). Preferably it is vertical.
  • substantially perpendicular to the discotic liquid crystal compound means that the average value of the angle between the film surface (optically anisotropic layer surface) and the disc surface of the discotic liquid crystal compound is in the range of 70 ° to 90 °.
  • one preferred embodiment of the optically anisotropic layer A is preferably a layer containing a substantially vertically aligned discotic liquid crystal compound in that the display performance of the image display device is more excellent.
  • a liquid crystal compound (rod-like liquid crystal compound or discotic liquid crystal compound having a reactive group (preferably a polymerizable group), preferably a disco liquid crystal compound. It is more preferable to form using a tick liquid crystal compound).
  • the number of reactive groups in the liquid crystal compound is not particularly limited, but is preferably 2 or more.
  • the liquid crystal compound may be a mixture of two or more. That is, the optically anisotropic layer A is formed by fixing a polymerizable liquid crystal compound (a rod-like liquid crystal compound having a polymerizable group or a discotic liquid crystal compound, preferably a discotic liquid crystal compound having a polymerizable group) by polymerization.
  • the kind of the polymerizable group contained in the rod-like liquid crystal compound or the discotic liquid crystal compound is not particularly limited, and a functional group capable of addition polymerization reaction is preferable, and a polymerizable ethylenically unsaturated group or a ring polymerizable group is preferable. More specifically, a (meth) acryloyl group, a vinyl group, a styryl group, an allyl group, etc. are mentioned preferably, and a (meth) acryloyl group is more preferable.
  • the (meth) acryloyl group is a concept including both a methacryloyl group and an acryloyl group.
  • an optically anisotropic layer forming composition containing a liquid crystal compound having a polymerizable group (hereinafter also simply referred to as “composition”) is applied to a predetermined substrate (including a temporary substrate) to form a coating film.
  • the optically anisotropic layer A can be produced by subjecting the obtained coating film to a curing treatment (ultraviolet irradiation (light irradiation treatment) or heat treatment).
  • a curing treatment ultraviolet irradiation (light irradiation treatment) or heat treatment.
  • the composition can be applied by a known method (for example, a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, or a die coating method).
  • the composition may contain a component other than the liquid crystal compound described above.
  • the composition may contain a polymerization initiator.
  • the polymerization initiator used is selected according to the type of the polymerization reaction, and examples thereof include a thermal polymerization initiator and a photopolymerization initiator.
  • photopolymerization initiators include ⁇ -carbonyl compounds, acyloin ethers, ⁇ -hydrocarbon substituted aromatic acyloin compounds, polynuclear quinone compounds, combinations of triarylimidazole dimers and p-aminophenyl ketones. It is done.
  • the amount of the polymerization initiator used is preferably 0.01 to 20% by mass, more preferably 0.5 to 5% by mass, based on the total solid content of the composition.
  • the composition may contain a polymerizable monomer from the viewpoint of the uniformity of the coating film and the strength of the film.
  • the polymerizable monomer include radically polymerizable or cationically polymerizable compounds.
  • it is a polyfunctional radically polymerizable monomer and is preferably copolymerizable with the above-described polymerizable group-containing liquid crystal compound. Examples thereof include those described in paragraphs [0018] to [0020] in JP-A No. 2002-296423.
  • the addition amount of the polymerizable monomer is preferably 1 to 50% by mass and more preferably 2 to 30% by mass with respect to the total mass of the liquid crystal compound.
  • the composition may contain a surfactant from the viewpoint of the uniformity of the coating film and the strength of the film.
  • a surfactant include conventionally known compounds, and fluorine compounds are particularly preferable. Specifically, for example, compounds described in paragraphs [0028] to [0056] in JP-A No. 2001-330725, compounds described in paragraphs [0069] to [0126] in Japanese Patent Application No. 2003-295212, and the like. Is mentioned.
  • the composition may contain a solvent, and an organic solvent is preferably used.
  • organic solvents include amides (eg N, N-dimethylformamide), sulfoxides (eg dimethyl sulfoxide), heterocyclic compounds (eg pyridine), hydrocarbons (eg benzene, hexane), alkyl halides (eg , Chloroform, dichloromethane), esters (eg, methyl acetate, ethyl acetate, butyl acetate), ketones (eg, acetone, methyl ethyl ketone), ethers (eg, tetrahydrofuran, 1,2-dimethoxyethane). Alkyl halides and ketones are preferred. Two or more organic solvents may be used in combination.
  • the composition may contain various alignment agents such as a vertical alignment accelerator and a horizontal alignment accelerator. Furthermore, the composition may contain an adhesion improving agent, a plasticizer, a polymer and the like in addition to the above components.
  • optically anisotropic layer B is a layer having the characteristics of a so-called ⁇ / 4 plate, and the in-plane retardation ReB of the optically anisotropic layer B at a wavelength of 550 nm satisfies the relationship of Formula 1.
  • the relationship of Formula 1-1 is satisfied, and the relationship of Formula 1-2 is more preferable, in that the display performance of the image display device is more excellent.
  • (Formula 1) 100 nm ⁇ ReB ⁇ 155 nm
  • Forma 1-1) 110 nm ⁇ ReB ⁇ 150 nm
  • Forma 1-2 115 nm ⁇ ReB ⁇ 145 nm
  • the thickness direction retardation RthB of the optically anisotropic layer B at a wavelength of 550 nm is smaller than zero. So-called negative Rth is shown.
  • the value of RthB may be negative, but is preferably ⁇ 80 to ⁇ 50 nm, more preferably ⁇ 75 to ⁇ 55 nm, from the viewpoint of better display performance of the image display device.
  • the angle formed by the absorption axis direction of the polarizing layer described later and the slow axis direction of the optically anisotropic layer B may be in the range of 15 ° ⁇ 8 °, and more preferably 15 ° ⁇ 5 °.
  • the thickness of the optically anisotropic layer B may be 20 ⁇ m or less, but is preferably 0.5 to 10 ⁇ m and more preferably 0.5 to 5 ⁇ m from the viewpoint of thinning.
  • the said thickness intends average thickness, measures the thickness of the arbitrary 5 points
  • the optically anisotropic layer B is formed from a composition containing a liquid crystal compound.
  • the definition of the liquid crystal compound is as described above.
  • the disc surface of the discotic liquid crystal compound is substantially perpendicular to the film surface (optically anisotropic layer surface). Is preferred.
  • the optically anisotropic layer B is preferably a layer containing a substantially vertically aligned discotic liquid crystal compound in that the display performance of the image display device is more excellent.
  • the optically anisotropic layer B can reduce the temperature change and humidity change of the optical characteristics, so that it has a reactive group (preferably a polymerizable group). It is more preferably formed using (a rod-like liquid crystal compound or a discotic liquid crystal compound, preferably a discotic liquid crystal compound). That is, the optically anisotropic layer B is formed by fixing a polymerizable liquid crystal compound (a rod-like liquid crystal compound having a polymerizable group or a discotic liquid crystal compound, preferably a discotic liquid crystal compound having a polymerizable group) by polymerization. It is preferable that it is a layer. The production procedure of the layer is the same as that of the optically anisotropic layer A.
  • the optically anisotropic layer C has a thickness direction retardation RthC of greater than 0 at a wavelength of 550 nm. So-called positive Rth is shown.
  • the value of RthC may be positive, but is preferably 10 to 140 nm, more preferably 30 to 120 nm, from the viewpoint that the display performance of the image display device is more excellent.
  • the in-plane retardation of the optically anisotropic layer C at a wavelength of 550 nm is not particularly limited, but the in-plane retardation at a wavelength of 550 nm is preferably from 0 to 20 nm, more preferably from 0 to 10 nm, from the viewpoint of better display performance of the image display device. Is more preferable.
  • the thickness of the optically anisotropic layer C may be 20 ⁇ m or less, but is preferably 0.5 to 10 ⁇ m and more preferably 0.5 to 5 ⁇ m from the viewpoint of thinning.
  • the said thickness intends average thickness, measures the thickness of the arbitrary 5 points
  • the optically anisotropic layer C is formed from a composition containing a liquid crystal compound.
  • the definition of the liquid crystal compound is as described above.
  • the disc surface of the discotic liquid crystal compound is substantially horizontal with respect to the film surface (optically anisotropic layer surface).
  • the term “discotic liquid crystal compound substantially horizontal” means that the average angle between the film surface (optically anisotropic layer surface) and the disc surface of the discotic liquid crystal compound is in the range of 0 ° to 20 °. 0 ° to 10 ° is more preferable, and 0 ° to 5 ° is even more preferable.
  • the optically anisotropic layer C is preferably a layer containing a substantially horizontally oriented discotic liquid crystal compound in that the display performance of the image display device is more excellent.
  • an optically anisotropic layer made of a substantially horizontally aligned discotic liquid crystal compound has a substantially zero Re value and a positive Rth value.
  • the optically anisotropic layer C can reduce the temperature change and the humidity change of the optical characteristics, so that the liquid crystal compound having a reactive group (preferably a polymerizable group). It is more preferably formed using (a rod-like liquid crystal compound or a discotic liquid crystal compound, preferably a discotic liquid crystal compound).
  • the optically anisotropic layer C is formed by fixing a polymerizable liquid crystal compound (a rod-like liquid crystal compound having a polymerizable group or a discotic liquid crystal compound, preferably a discotic liquid crystal compound having a polymerizable group) by polymerization. It is preferable that it is a layer.
  • the production procedure of the layer is the same as that of the optically anisotropic layer A.
  • the retardation film may include other layers other than the optically anisotropic layer A, the optically anisotropic layer B, and the optically anisotropic layer C as long as the effects of the present invention are not impaired.
  • the retardation film may include an alignment film having a function of defining the alignment direction of the liquid crystal compound.
  • the alignment film generally contains a polymer as a main component.
  • the polymer material for alignment film is described in many documents, and many commercially available products can be obtained.
  • the polymer material used is preferably polyvinyl alcohol or polyimide, and derivatives thereof. In particular, modified or unmodified polyvinyl alcohol is preferred.
  • the alignment film refers to the modified polyvinyl alcohol described in WO01 / 88574A1, page 43, line 24 to page 49, line 8, and patent No. 3907735, paragraphs [0071] to [0095]. be able to.
  • the alignment film is usually subjected to a known rubbing treatment. That is, the alignment film is usually preferably a rubbing alignment film that has been rubbed.
  • the thickness of the alignment film may be 20 ⁇ m or less, preferably 0.01 to 10 ⁇ m, more preferably 0.01 to 1 ⁇ m, and more preferably 0.01 to 0.5 ⁇ m. More preferably.
  • the polarizing layer may be a so-called linear polarizer (linear polarizing layer) having a function of converting natural light into specific linearly polarized light.
  • linear polarizer linear polarizing layer
  • An absorption type polarizer absorption type polarizing layer
  • the type of the polarizing layer is not particularly limited, and a commonly used polarizing layer can be used.
  • an iodine polarizing film, a dye polarizing film using a dichroic dye (dichroic organic dye), Any of the polyene polarizing films can be used.
  • the iodine-based polarizing film and the dye-based polarizing film are generally produced by adsorbing iodine or a dichroic dye to polyvinyl alcohol and stretching it.
  • the thickness of the polarizing layer is not particularly limited, but is preferably 50 ⁇ m or less, more preferably 30 ⁇ m or less, and even more preferably 20 ⁇ m or less from the viewpoint of thinning.
  • the thickness of the polarizing layer is usually 1 ⁇ m or more and preferably 5 ⁇ m or more.
  • the polarizing layer is preferably a layer formed from a dichroic dye composition containing at least one kind of thermotropic liquid crystalline dichroic dye.
  • the dichroic dye for the coating type polarizing layer used in the present invention a dye described in JP 2011-237513 A can be suitably used.
  • thermotropic liquid crystalline dichroic dyes examples include thermotropic liquid crystalline dichroic dyes, but are not limited to these compounds.
  • the proportion of the non-coloring liquid crystal compound is preferably 30% by mass or less, more preferably 20% by mass or less, further preferably 10% by mass or less, It is particularly preferably 5% by mass or less.
  • the non-coloring liquid crystal compound refers to a compound that does not absorb in the visible light spectral region, that is, the spectral region of 400 to 700 nm and exhibits a nematic liquid crystal phase or a smectic liquid crystal phase. Examples of the liquid crystal compounds described in pages 154 to 192 and pages 715 to 722 of “Device Handbook” (edited by Japan Society for the Promotion of Science 142nd Committee, Nikkan Kogyo Shimbun, 1989).
  • the thickness of the polarizing layer formed using the dichroic dye composition is not particularly limited, but is preferably 250 nm or more, more preferably 350 nm or more, and further preferably 450 nm or more.
  • the upper limit is not particularly limited, but is preferably 2000 nm or less from the viewpoint of thinning.
  • the circularly polarizing film of the present invention has the above-described polarizing layer and retardation film.
  • the circularly polarizing film has a thickness (overall thickness) of 100 ⁇ m or less, preferably 80 ⁇ m or less, and more preferably 60 ⁇ m or less from the viewpoint of further thinning the apparatus.
  • the lower limit is not particularly limited, but is usually 20 ⁇ m or more in many cases.
  • the said thickness intends average thickness, measures the thickness of arbitrary 5 points
  • the thickness of the circularly polarizing film does not include the thickness of the transparent protective film described later.
  • a transparent protective film is not contained in the member which comprises a circularly-polarizing film.
  • the layer for example, a transparent protective film, a hard-coat layer, alignment film etc. which are arrange
  • the circularly polarizing film can be applied to various applications, and among them, it can be suitably used as an antireflection plate. That is, the circularly polarizing film is included in the image display device as an antireflection plate.
  • the antireflection plate is suitable for antireflection applications of image display devices such as organic EL display devices, liquid crystal display devices (LCD), plasma display panels (PDP), electroluminescence displays (ELD), and cathode ray tube display devices (CRT).
  • image display devices such as organic EL display devices, liquid crystal display devices (LCD), plasma display panels (PDP), electroluminescence displays (ELD), and cathode ray tube display devices (CRT).
  • the contrast ratio of display light can be improved.
  • an antireflection plate made of the circularly polarizing film of the present invention can be used on the light extraction surface side of the organic EL display device.
  • the organic EL display device includes a circularly polarizing film and an organic EL panel (organic EL element), and the polarizing layer, the retardation film, and the organic EL panel are arranged in this order from the viewing side.
  • external light becomes linearly polarized light by the polarizing layer and then becomes circularly polarized light by passing through the retardation film.
  • the circularly polarized state is reversed, and when it passes through the retardation film again, it becomes linearly polarized light inclined by 90 ° from the incident and reaches the polarizing layer to be absorbed. Is done. As a result, the influence of external light can be suppressed.
  • the antireflection plate for example, it is preferable to include a step in which the retardation film and the polarizing layer are successively laminated in a long state.
  • the long antireflection plate is cut according to the size of the screen of the image display device used.
  • the optical film of this invention has the said circularly-polarizing film and the transparent protective film arrange
  • the type of the transparent protective film is not particularly limited, and may be, for example, a so-called transparent resin support or a hard coat layer, or a laminate of the transparent resin support and the hard coat layer. A laminate including a hard coat layer is preferred.
  • the transparent resin support a known transparent resin support can be used.
  • a material for forming the transparent resin support a cellulose polymer represented by triacetyl cellulose, a thermoplastic norbornene-based material, or the like. Resins (ZEONEX, ZEONOR manufactured by Nippon Zeon Co., Ltd., Arton manufactured by JSR Co., Ltd.), acrylic resins, and polyester resins can be used.
  • the transparent protective film may be bonded to the circularly polarizing film via an adhesive layer or an adhesive layer.
  • a functional layer may be further included.
  • the functional layer include an antireflection layer and an antiglare layer. A known layer material is used for these. Note that a plurality of these layers may be stacked.
  • the optical film can be suitably applied as an antireflection plate, similarly to the use of the circularly polarizing film described above.
  • the manufacturing method in particular of the circularly-polarizing film and optical film mentioned above is not restrict
  • a method for producing a circularly polarizing film having the following steps 1 to 5 can be mentioned.
  • the first alignment film can be used in common when forming the optically anisotropic layer X and the optically anisotropic layer C, and the number of alignment films can be reduced as compared with the conventional method.
  • the thickness can be reduced, and the productivity is improved by reducing the manufacturing procedure.
  • Step 1 Laminate having first temporary support, first alignment film, and optically anisotropic layer X of optically anisotropic layer A and optically anisotropic layer B in this order.
  • Step of preparing X Step 2) Step of bonding a third temporary support on optically anisotropic layer X in laminate X to obtain laminate Z (Step 3) First temporary support from laminate Z The step of peeling the body and forming the optically anisotropic layer C on the first alignment film to obtain the laminate W (Step 4) the second temporary support, the second alignment film, and the optical anisotropy
  • An optically anisotropic layer Y in the laminate Y having the other optically anisotropic layer Y of the layers A and B in this order, an optically anisotropic layer C in the laminate W, Are laminated through an adhesive layer or an adhesive layer to obtain a laminate V (step 5).
  • the second temporary support is peeled off from the laminate V, and a polarizing layer is provided on the optically anisotropic layer A
  • Step 1 is a step of preparing a stacked body X50 having the first temporary support 32, the first alignment film 34, and the optically anisotropic layer X36 in this order, as shown in FIG. Below, each member contained in the laminated body X is explained in full detail first.
  • a 1st temporary support body (it also calls a peelable support body) is a base material which supports the 1st alignment film mentioned later, and adheres to the 1st alignment film surface so that peeling is possible.
  • the first temporary support include a support whose surface is treated with a silicone-based release agent and other release agents, and a support which itself has peelability.
  • Examples of the material constituting the temporary support include, for example, cellulose polymers; acrylic polymers having an acrylate polymer such as polymethyl methacrylate and lactone ring-containing polymers; thermoplastic norbornene polymers; polycarbonate polymers; polyethylene terephthalate Polyester polymers such as polyethylene naphthalate; Styrene polymers such as polystyrene and acrylonitrile / styrene copolymers (AS resin); Polyolefin polymers such as polyethylene, polypropylene and ethylene / propylene copolymers; Vinyl chloride polymers; Amide polymers such as nylon and aromatic polyamide; imide polymers; sulfone polymers; polyether sulfone polymers; polyether ether ketone polymers; Nsurufido polymers; like or polymer obtained by mixing these polymers; vinylidene chloride polymer; vinyl alcohol-based polymer, vinyl butyral-based polymers; arylate polymers; polyoxymethylene
  • thermoplastic norbornene polymers are preferred because of excellent peelability.
  • polyester polymers such as thermoplastic norbornene polymer, polyethylene terephthalate and polyethylene naphthalate are more preferable.
  • the thickness of the first temporary support is not particularly limited, but is preferably 20 to 500 ⁇ m and more preferably 30 to 200 ⁇ m from the viewpoint of excellent handleability.
  • any one of the optically anisotropic layer A and the optically anisotropic layer B described above is used.
  • the production method of the laminate X is not particularly limited, and a known method is adopted. Usually, a first alignment film is formed on the first temporary support, and then an optically different material is formed on the first alignment film. A method for forming the isotropic layer A may be mentioned. The manufacturing method in particular of a 1st alignment film is not restrict
  • Step 2 is a step of obtaining the laminate Z52 by bonding the third temporary support 38 on the optically anisotropic layer X36 in the laminate X50, as shown in FIG. 3B.
  • the kind in particular of the 3rd temporary support body used is not restrict
  • the method for bonding the third temporary support to the optically anisotropic layer X is not particularly limited, and examples thereof include a method of bonding the both via a known adhesive layer or adhesive layer.
  • Step 3 is a step of peeling the first temporary support 32 from the stacked body Z52 shown in FIG. 3B to form the optically anisotropic layer C18 on the first alignment film 34 to obtain the stacked body W54.
  • the method for peeling the first temporary support is not particularly limited, and a known method is adopted. For example, a sharp blade-like object is inserted into the interface between the first temporary support and the first alignment film, and the peeling is triggered. In addition, there is a method in which one end of the first temporary support is gripped, moved away from the first alignment film, and peeled off.
  • the formation method in particular of the optically anisotropic layer C is not restrict
  • step 4 As shown in FIG. 3D, the second temporary support 40, the second alignment film 42, and the other optical anisotropy of the optically anisotropic layer A and the optically anisotropic layer B are used.
  • the optically anisotropic layer Y44 in the laminate Y56 having the conductive layer Y44 in this order and the optically anisotropic layer C18 in the laminate W54 are bonded together via the adhesive layer or the adhesive layer 46, and the laminate This is a step of obtaining V58.
  • the kind in particular of the 2nd temporary support body used is not restrict
  • the definition of a 2nd alignment film is synonymous with the definition of the alignment film demonstrated with the said circularly-polarizing film.
  • the optically anisotropic layer Y the other of the optically anisotropic layer A and the optically anisotropic layer B described above is used.
  • the optical anisotropic layer A is used as the optical anisotropic layer X
  • the optical anisotropic layer B is used as the optical anisotropic layer Y.
  • the method for bonding the optically anisotropic layer Y in the laminated body V and the optically anisotropic layer C in the laminated body W through the adhesive layer or the adhesive layer is not particularly limited, and a known method can be adopted.
  • the curable adhesive composition is applied on one surface of the optically anisotropic layer Y and the optically anisotropic layer C, and the optically anisotropic layer Y and the optically anisotropic layer C are formed into a curable adhesive composition.
  • the method of bonding through a thing, performing a hardening process, and forming an adhesive layer is mentioned.
  • a curable adhesive composition a photocurable thing or a thermosetting thing may be sufficient, and a well-known curable adhesive composition is used.
  • step 5 As shown in FIG. 3E, the second temporary support 38 is peeled off from the laminate V58, the polarizing layer 48 is bonded to the optically anisotropic layer X36 side, and the circularly polarizing film 110 is attached. It is a process to obtain. In addition, what is necessary is just to peel the 2nd temporary support body 40 during this process or after this process. Further, the second temporary support 40 does not constitute the circularly polarizing film 110.
  • the definition of the polarizing layer is as described above.
  • the method for bonding the polarizing layer to the optically anisotropic layer A side is not particularly limited, and examples thereof include a method for bonding the two through a known adhesive layer or adhesive layer.
  • the method for producing the optical film is not particularly limited, and examples thereof include a method in which a transparent protective film and a circularly polarizing film are bonded together via an adhesive layer or an adhesive layer.
  • Example 1 ⁇ Preparation of retardation film (optically anisotropic layer laminate)> (Formation of alignment film A)
  • TD80UL long cellulose acylate film
  • FUJIFILM Corporation a long cellulose acylate film having the following composition was continuously applied with a # 14 wire bar. Next, the coating film was dried with warm air of 60 ° C. for 60 seconds and further with warm air of 100 ° C. for 120 seconds to obtain alignment film A.
  • composition of coating solution for alignment film A Denatured polyvinyl alcohol-1 10 parts by weight Water 308 parts by weight Methanol 70 parts by weight Isopropanol 29 parts by weight Photopolymerization initiator (Irgacure 2959, manufactured by Ciba Japan) 0.8 parts by weight ⁇ ⁇
  • An optically anisotropic layer A coating liquid containing a discotic liquid crystal compound having the following composition was continuously applied on the prepared alignment film A with a # 4.8 wire bar to form an optically anisotropic layer A.
  • the conveyance speed of the film was 26 m / min.
  • heating was performed with warm air of 130 ° C. for 90 seconds, then with warm air of 100 ° C. for 60 seconds, and at 80 ° C., 300 mJ / cm 2 .
  • UV (ultraviolet) irradiation was performed to fix the alignment of the liquid crystal compound.
  • the thickness of the optically anisotropic layer A was 1.8 ⁇ m.
  • the average tilt angle of the disc surface of the discotic liquid crystal compound with respect to the film surface was 90 °, and it was confirmed that the discotic liquid crystal compound was aligned perpendicular to the film surface.
  • the angle of the slow axis was parallel to the rotation axis of the rubbing roller, and was 17 ° when the film width direction was 0 ° (the film longitudinal direction was 90 °).
  • the alignment film A and the optically anisotropic layer A were in close contact, and the cellulose acylate film could be peeled from the alignment film A.
  • composition of coating solution for optically anisotropic layer A ⁇ Discotic liquid crystal-1 80 parts by mass Discotic liquid crystal-2 20 parts by mass alignment film interface alignment agent-1 0.55 parts by mass alignment film interface alignment agent-2 0.05 parts by mass fluorinated compound (F-1) 0. 2 parts by mass of fluorine-containing compound (F-2) 0.05 part by mass of fluorine-containing compound (F-3) 0.1 part by mass of ethylene oxide-modified trimethylolpropane triacrylate 10 parts by weight photopolymerization initiator (Irgacure 907, manufactured by Ciba Japan) 3.0 parts by weight methyl ethyl ketone 200 parts by weight ⁇ ⁇
  • photopolymerization initiator Irgacure 907, manufactured by Ciba Japan
  • An alignment film B was prepared in the same manner as the alignment film A except that an alignment film B coating solution having the following composition was used instead of the alignment film A coating solution.
  • composition of alignment film B coating solution ⁇ Modified polyvinyl alcohol-2 below 10 parts by weight water 371 parts by weight Methanol 119 parts by weight glutaraldehyde (crosslinking agent) 0.5 parts by weight citrate ester (manufactured by Sankyo Chemical Co., Ltd.) 0.175 parts by weight photopolymerization initiator ( Irgacure 2959, manufactured by Ciba Japan) 2.0 parts by mass ⁇
  • the alignment film B is used instead of the alignment film A, and the # 2.4 wire bar is used instead of the # 4.8 wire bar.
  • An optically anisotropic layer B was formed.
  • the thickness of the optically anisotropic layer B was 0.9 ⁇ m.
  • the average tilt angle of the disc surface of the discotic liquid crystal compound with respect to the film surface was 90 °, and it was confirmed that the discotic liquid crystal compound was aligned perpendicular to the film surface. Further, the angle of the slow axis was orthogonal to the rotation axis of the rubbing roller, and was 77 ° when the film width direction was 0 ° (the film longitudinal direction was 90 °).
  • the alignment film B and the optically anisotropic layer B were in close contact, and the cellulose acylate film could be peeled from the alignment film B.
  • the cellulose acylate film was peeled off, and a long film in which a pressure-sensitive adhesive layer, an optically anisotropic layer A, and an alignment film A were laminated in this order on a PET film substrate was produced.
  • an optically anisotropic layer C coating liquid containing a discotic liquid crystal compound having the following composition is continuously applied onto the alignment film A with a # 4.0 wire bar. Formed.
  • the conveyance speed of the film was 26 m / min.
  • heating was performed with warm air of 130 ° C.
  • the thickness of the optically anisotropic layer C was 0.9 ⁇ m.
  • the average tilt angle of the disc surface of the discotic liquid crystal compound with respect to the film surface was 0 °, and it was confirmed that the discotic liquid crystal compound was aligned horizontally with respect to the film surface.
  • a long film (AC) in which a pressure-sensitive adhesive layer, an optically anisotropic layer A, an alignment film A, and an optically anisotropic layer C are laminated in this order on a PET film substrate is prepared.
  • composition of coating solution for optically anisotropic layer C ⁇
  • Discotic liquid crystal-3 93 parts by mass ethylene oxide modified trimethylolpropane triacrylate 7 parts by mass styrene boronic acid 0.1 parts by mass fluorine-containing compound (F-4) 1.0 part by mass photopolymerization initiator (Irgacure 907, manufactured by Ciba Japan) 3.0 parts by mass sensitizer (Kayacure DETX, Japan) Manufactured by Kayaku Co., Ltd.) 1.0 parts by weight Methyl ethyl ketone 350 parts by weight ⁇
  • composition of UV curable adhesive coating solution ⁇ Aronix UVX-5457 (manufactured by Toagosei Co., Ltd.) 9 parts by mass of fluorine-containing compound (F-1) 0.1 part by weight methyl ethyl ketone 15 parts by weight methyl isobutyl ketone 6 parts by weight ⁇ ⁇
  • PET film, pressure-sensitive adhesive layer, optical anisotropic layer A, alignment film A, optical anisotropic layer C, UV curable adhesive layer, optical anisotropic layer B, alignment film B, and cellulose A long optically anisotropic layer laminate ACB in which acylate films were laminated in this order was produced.
  • This laminated film was able to peel between the PET film and the pressure-sensitive adhesive layer and between the alignment film B and the cellulose acylate film.
  • Each single layer of optically anisotropic layer A, optically anisotropic layer C, and optically anisotropic layer B is formed on an alignment film on a glass substrate, and an automatic birefringence meter (KOBRA-21ADH, Oji Scientific Instruments ( The light incident angle dependency was measured using a product manufactured by Co., Ltd.
  • the retardation in the front direction (in-plane retardation) at a wavelength of 550 nm of the optically anisotropic layer A, the optically anisotropic layer C, and the optically anisotropic layer B is 240 nm, 0 nm, and 120 nm, respectively.
  • the retardations in the thickness direction at a wavelength of 550 nm of the hydrophilic layer A, the optically anisotropic layer C, and the optically anisotropic layer B were ⁇ 120 nm, 80 nm, and ⁇ 60 nm, respectively.
  • the retardation in the front direction (in-plane retardation) of the optically anisotropic layer laminate ACB (PET film and cellulose acylate film on the alignment film B side peeled off) measured using the automatic birefringence meter is the wavelength. At 450 nm, 550 nm, and 650 nm, they were 118 nm, 138 nm, and 150 nm, respectively.
  • outer layer cellulose acylate dope 1 10 parts by mass of the following matting agent dispersion 1 was added to the core layer cellulose acylate dope 1 (90 parts by mass) to prepare an outer layer cellulose acylate dope 1.
  • AEROSIL R972 manufactured by Nippon Aerosil Co., Ltd.
  • Methylene chloride first solvent
  • Methanol second solvent
  • Core layer cellulose acylate dope 1 part by mass -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  • the following hard coat curable composition hard coat 1 was prepared as a coating solution for forming a hard coat layer.
  • the hard coat 1 is applied on the surface of the polarizing plate protective film 01 produced above, and then dried at 100 ° C. for 60 seconds, and UV is 1.5 kW, 300 mJ / min under the condition of 0.1% or less of nitrogen. Irradiation was performed at cm 2 and curing was performed to prepare a polarizing plate protective film 01 with a hard coat layer having a hard coat layer with a thickness of 5 ⁇ m.
  • a polarizing plate 01 with a single-side protective film was prepared by laminating by roll-to-roll. At this time, it bonded together so that the cellulose acylate film side of a polarizing plate protective film might become the polarizing layer 1 side.
  • the angle was 13 °, and the angle formed by the slow axis of the optically anisotropic layer A and the slow axis of the optically anisotropic layer B was 60 °.
  • the hard coat layer (5 ⁇ m), the cellulose acylate film (25 ⁇ m), the polarizing layer (15 ⁇ m), the pressure-sensitive adhesive layer (10 ⁇ m), the optical anisotropic layer A (1.8 ⁇ m), the alignment film A (0.5 ⁇ m), optically anisotropic layer C (0.9 ⁇ m), UV curable adhesive layer (3 ⁇ m), optically anisotropic layer B (0.9 ⁇ m), alignment film B (0.5 ⁇ m)
  • An optical film P01 total thickness 62.6 ⁇ m laminated in order was prepared. The thickness corresponding to the circularly polarizing film was 32.6 ⁇ m.
  • Example 2 ⁇ Preparation of dye polarizing plate> The following dye polarizing layer coating solution was prepared.
  • the following PB-9, C-3, and C-15 correspond to the exemplified compounds (PB-9, C-3, and C-15) exemplified for the above-described thermotropic liquid crystalline dichroic dyes, respectively. .
  • Dichroic dye (PB-9) 50 parts by mass Dichroic dye (C-3) 30 parts by mass Dichroic dye (C-15) 20 parts by mass Fluorine-containing compound (F-5) 0.3 parts by mass ethylene Oxide-modified trimethylolpropane triacrylate 20 parts by mass photopolymerization initiator (Irgacure OXE-01, manufactured by Ciba Japan) 2.0 parts by mass chloroform 1900 parts by mass --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  • An alignment film D was formed on the surface of a commercially available PET film (16 ⁇ m thick) in the same manner as the alignment film A forming method described in Example 1, and a rubbing treatment was performed. At this time, the angle formed by the film longitudinal direction and the rubbing rotation axis was 90 °. On the rubbing surface, the dye polarizing layer coating solution was applied using a bar coater. Next, the film was aged at a film surface temperature of 160 ° C. for 15 seconds and cooled to room temperature. Thereafter, an ultraviolet ray of 500 mJ was irradiated in a nitrogen atmosphere (oxygen concentration of 100 ppm or less) to obtain a dye polarizing plate 02 having a dye polarizing layer (corresponding to a polarizing layer).
  • the thickness of the formed dye polarizing layer was 0.5 ⁇ m.
  • the absorption axis of the dye polarizing layer was parallel to the film longitudinal direction (perpendicular to the rubbing rotation axis), and the degree of polarization was 98% when the degree of polarization was calculated by measuring absorption with a spectrophotometer.
  • the pressure-sensitive adhesive layer is exposed by peeling off the PET film of the optically anisotropic layer laminate (ACB) produced in Example 1 above, and is continuously bonded to the dye polarizing layer side of the produced dye polarizing plate 02. It was. Subsequently, the cellulose acylate film in contact with the alignment film B was peeled off. In the above bonding, the angle formed by the absorption axis of the dye polarizing layer (polarizing layer) and the slow axis of the optically anisotropic layer A is 73 °, and the absorption axis of the dye polarizing layer (polarizing layer) is optically anisotropic.
  • the angle formed by the slow axis of the optical layer B was 13 °, and the angle formed by the slow axis of the optically anisotropic layer A and the slow axis of the optically anisotropic layer B was 60 °.
  • PET film (16 ⁇ m), alignment film D (0.5 ⁇ m), dye polarizing layer (0.5 ⁇ m), pressure-sensitive adhesive layer (10 ⁇ m), optical anisotropic layer A (1.8 ⁇ m), Alignment film A (0.5 ⁇ m), optical anisotropic layer C (0.9 ⁇ m), UV curable adhesive layer (3 ⁇ m), optical anisotropic layer B (0.9 ⁇ m), alignment film B (0.5 ⁇ m)
  • an optical film P02 total thickness: 34.6 ⁇ m laminated in this order was produced.
  • the thickness corresponding to the circularly polarizing film was 18.1 ⁇ m.
  • Example 3 ⁇ Preparation of retardation film (optically anisotropic layer laminate)> (Formation of alignment film B ′)
  • a long cellulose acylate film (TD80UL, manufactured by FUJIFILM Corporation) is passed through a dielectric heating roll having a temperature of 60 ° C., and the film surface temperature is raised to 40 ° C.
  • the alkaline solution having the composition was applied at a coating amount of 14 ml / m 2 using a bar coater and transported for 10 seconds under a steam far infrared heater manufactured by Noritake Co., Ltd., heated to 110 ° C.
  • pure water was applied at 3 ml / m 2 using the same bar coater.
  • washing with a fountain coater and draining with an air knife were repeated three times, and then transported to a drying zone at 70 ° C. for 10 seconds and dried to prepare an alkali saponified cellulose acylate film.
  • An alignment film B ′ coating solution having the following composition was continuously applied with a # 14 wire bar on the surface of the cellulose acylate film subjected to the alkali saponification treatment. Next, the coating film was dried with warm air of 60 ° C. for 60 seconds and further with warm air of 100 ° C. for 120 seconds to obtain an alignment film B ′.
  • An optically anisotropic layer B ′ coating liquid containing a discotic liquid crystal compound having the following composition is continuously applied to the prepared alignment film B ′ with a wire bar # 2.4 to form the optically anisotropic layer B ′. Formed. The conveyance speed of the film was 26 m / min. For drying the solvent of the coating solution and orientation ripening of the discotic liquid crystal compound, heating was performed with warm air at 130 ° C. for 90 seconds, followed by heating with warm air at 100 ° C. for 60 seconds, and 300 mJ / cm 2 at 80 ° C. UV (ultraviolet) irradiation was performed to fix the alignment of the liquid crystal compound. The thickness of the optically anisotropic layer B ′ was 0.9 ⁇ m.
  • the average tilt angle of the disc surface of the discotic liquid crystal compound with respect to the film surface was 90 °, and it was confirmed that the discotic liquid crystal compound was aligned perpendicular to the film surface. Further, the angle of the slow axis was orthogonal to the rotation axis of the rubbing roller, and was 77 ° when the film width direction was 0 ° (the film longitudinal direction was 90 °). The cellulose acylate film and the alignment film B ′ were in close contact, and the optically anisotropic layer B ′ could be peeled from the alignment film B ′.
  • composition of coating solution for optically anisotropic layer B ' ⁇ Discotic liquid crystal-1 80 parts by mass Discotic liquid crystal-2 20 parts by mass alignment film interfacial alignment agent-1 0.55 parts by mass fluorinated compound (F-1) 0.2 parts by mass fluorinated compound (F-2) 0 .05 parts by mass of fluorine-containing compound (F-3) 0.1 parts by mass of ethylene oxide-modified trimethylolpropane triacrylate 10 parts by weight photopolymerization initiator (Irgacure 907, manufactured by Ciba Japan) 3.0 parts by weight methyl ethyl ketone 200 parts by weight ⁇ ⁇
  • photopolymerization initiator Irgacure 907, manufactured by Ciba Japan
  • Example 1 (Lamination of optically anisotropic layer A, optically anisotropic layer C, and optically anisotropic layer B ′)
  • a PET film, a pressure-sensitive adhesive layer, and an optically anisotropic layer A are used in the same manner as in Example 1 except that the optically anisotropic layer B ′ is used.
  • a laminate ACB ′ was produced. This laminated film was able to peel between the PET film and the pressure-sensitive adhesive layer and between the optically anisotropic layer B ′ and the alignment film B ′.
  • the retardation in the front direction (in-plane retardation) of the optically anisotropic layer B ′ at a wavelength of 550 nm was 120 nm, and the retardation in the thickness direction was ⁇ 60 nm.
  • the retardation in the front direction of the optically anisotropic layered product ACB ′ (PET film and alignment film B ′ and the cellulose acylate film were peeled off) was 118 nm, 138 nm, and 150 nm at wavelengths of 450 nm, 550 nm, and 650 nm, respectively. there were.
  • the angle formed by the absorption axis of the dye polarizing layer (polarizing layer) and the slow axis of the optically anisotropic layer A is 73 °
  • the absorption axis of the dye polarizing layer (polarizing layer) is optically anisotropic.
  • the angle formed with the slow axis of the optical layer B ′ is 13 °
  • the angle formed between the slow axis of the optically anisotropic layer A and the slow axis of the optically anisotropic layer B ′ is 60 °. did.
  • PET film (16 ⁇ m), alignment film D (0.5 ⁇ m), dye polarizing layer (0.5 ⁇ m), pressure-sensitive adhesive layer (10 ⁇ m), optical anisotropic layer A (1.8 ⁇ m), An alignment film A (0.5 ⁇ m), an optically anisotropic layer C (0.9 ⁇ m), a UV curable adhesive layer (3 ⁇ m), and an optically anisotropic layer B ′ (0.9 ⁇ m) were laminated in this order.
  • An optical film P03 (total thickness is 34.1 ⁇ m) was produced. The thickness corresponding to the circularly polarizing film was 17.6 ⁇ m.
  • optically anisotropic layer laminate In the production of the optically anisotropic layer laminate of Example 1, an optically anisotropic layer laminate (AB) was produced except for the step of forming the optically anisotropic layer C.
  • the PET film of the produced optically anisotropic layer laminate (AB) was peeled to expose the pressure-sensitive adhesive layer, and was bonded to the polarizing layer side of the polarizing plate 01 with a single-side protective film. Subsequently, the cellulose acylate film in contact with the alignment film B was peeled off.
  • the hard coat layer (5 ⁇ m), the cellulose acylate film (25 ⁇ m), the polarizing layer (15 ⁇ m), the pressure-sensitive adhesive layer (10 ⁇ m), the optically anisotropic layer A (1.8 ⁇ m), the alignment film A ( 0.5 ⁇ m), UV curable adhesive layer (3 ⁇ m), optically anisotropic layer B (0.9 ⁇ m), alignment film B (0.5 ⁇ m) are laminated in this order on optical film HP01 (total thickness is 61.7 ⁇ m). The thickness corresponding to the circularly polarizing film was 31.7 ⁇ m.
  • a cellulose acylate film HC having a thickness of 60 ⁇ m.
  • the cellulose acylate film HC has a retardation in the front direction (in-plane retardation) at a wavelength of 550 nm of 1 nm and a retardation in the thickness direction of 80 nm, which is substantially the same as the optically anisotropic layer C of Example 1 above. It had optical anisotropy.
  • Example 1 instead of forming the optically anisotropic layer C, the cellulose acylate film HC was bonded using a pressure-sensitive adhesive film (thickness 10 ⁇ m). Subsequently, in the same manner as in Example 1, the polarizing plate with the single-side protective film 01 was bonded to the polarizing layer side, and finally the cellulose acylate film in contact with the alignment film B was peeled off.
  • the hard coat layer (5 ⁇ m), the cellulose acylate film (25 ⁇ m), the polarizing layer (15 ⁇ m), the pressure-sensitive adhesive layer (10 ⁇ m), the optically anisotropic layer A (1.8 ⁇ m), the alignment film A ( 0.5 ⁇ m), pressure-sensitive adhesive layer (10 ⁇ m), cellulose acylate film HC (60 ⁇ m), UV curable adhesive layer (3 ⁇ m), optical anisotropic layer B (0.9 ⁇ m), alignment film B (0.5 ⁇ m) ) Produced an optical film HP02 (total thickness: 131.7 ⁇ m) laminated in this order. In addition, the thickness applicable to a circularly-polarizing film was 101.7 micrometers.
  • the “Will satisfy the relationship of Re (450) ⁇ Re (550) ⁇ Re (650)” column indicates “A” when the retardation film satisfies the above relationship, and “No” when the relationship is not satisfied. “B”.
  • the column “Whether the thickness of the layer contained in the retardation film is 20 ⁇ m or less” is “A” when the thickness of the layer contained in the retardation film is 20 ⁇ m or less, and “ B ”.
  • “Angle” in Table 1 represents an angle formed by the slow axis direction of the optically anisotropic layer A (or the optically anisotropic layer B) and the absorption axis direction of the polarizing layer.
  • the organic EL display device using the optical films P01 to P03 of the examples had excellent display quality both in the front direction and in the oblique direction. In addition, even after standing in a humid heat environment, the display performance was little deteriorated. In particular, the effect (Examples 2 and 3) including the thermotropic liquid crystalline dichroic dye as the polarizing layer was more excellent.
  • the optical film HP01 of the comparative example coloring and light leakage were observed in an oblique direction. Further, in the optical film HP02, the thickness of the display device was large and the durability evaluation was inferior.

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  • Electroluminescent Light Sources (AREA)

Abstract

La présente invention concerne : un film de polarisation circulaire qui permet à un dispositif d'affichage d'images, en particulier un dispositif d'affichage électroluminescent organique, d'obtenir un bon équilibre entre la réduction de l'épaisseur du dispositif et l'amélioration des performances d'affichage s'il est utilisé dans le dispositif d'affichage, et qui est susceptible de supprimer la diminution des performances d'affichage du dispositif d'affichage d'images même dans un environnement de chaleur humide ; un film optique ; et un dispositif d'affichage d'images. Un film de polarisation circulaire selon la présente invention est obtenu par stratification d'une couche de polarisation et d'un film de retard, et le film de retard comprend au moins une couche optiquement anisotrope A, une couche optiquement anisotrope B et une couche optiquement anisotrope C. L'ensemble de la couche optiquement anisotrope A, la couche optiquement anisotrope B et la couche optiquement anisotrope C est formé à partir d'une composition qui contient un composé cristallin liquide. Le retard dans le plan du film de retard satisfait à la relation Re(450) < Re(550) < Re(650). La couche optiquement anisotrope A, la couche optiquement anisotrope B et la couche optiquement anisotrope C ont des caractéristiques optiques spécifiques. L'épaisseur de ce film de polarisation circulaire est inférieure ou égale à 100 µm, et des épaisseurs respectives des couches contenues dans le film de retard sont inférieures ou égales à 20 µm.
PCT/JP2015/073987 2014-09-01 2015-08-26 Film de polarisation circulaire, film optique et dispositif d'affichage d'images WO2016035636A1 (fr)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017083843A (ja) * 2015-10-30 2017-05-18 住友化学株式会社 偏光板
WO2019176918A1 (fr) * 2018-03-16 2019-09-19 富士フイルム株式会社 Dispositifs d'affichage électroluminescent
JP2019197168A (ja) * 2018-05-10 2019-11-14 住友化学株式会社 光学積層体および表示装置
CN111869324A (zh) * 2018-03-23 2020-10-30 东洋纺株式会社 电致发光显示装置
US10969527B2 (en) 2016-07-29 2021-04-06 Nitto Denko Corporation Polarizing plate with phase difference layers, and organic EL display device
CN112946805A (zh) * 2019-12-11 2021-06-11 住友化学株式会社 圆偏振板
TWI731228B (zh) * 2017-03-29 2021-06-21 日商大日本印刷股份有限公司 光學膜及影像顯示裝置
JP2021103302A (ja) * 2017-04-07 2021-07-15 富士フイルム株式会社 異方性光吸収膜および積層体
US11933998B2 (en) 2019-12-26 2024-03-19 3M Innovative Properties Company Film stacks for thin circular polarizers

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004240012A (ja) * 2003-02-04 2004-08-26 Fuji Photo Film Co Ltd 位相差板および楕円偏光板
JP2008165185A (ja) * 2006-12-07 2008-07-17 Nitto Denko Corp 積層光学フィルム、積層光学フィルムを用いた液晶パネル、および液晶表示装置
JP2009116342A (ja) * 2008-12-17 2009-05-28 Sharp Corp 反射型液晶表示装置
JP2011123252A (ja) * 2009-12-10 2011-06-23 Fujifilm Corp 液晶表示装置
WO2013137464A1 (fr) * 2012-03-15 2013-09-19 富士フイルム株式会社 Elément d'affichage el organique comprenant un stratifié optique
JP2013190464A (ja) * 2012-03-12 2013-09-26 Konica Minolta Inc 偏光板の製造方法、偏光板及び液晶表示装置
JP2014134775A (ja) * 2012-12-14 2014-07-24 Dainippon Printing Co Ltd 光学フィルム、光学フィルム用転写体、画像表示装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004240012A (ja) * 2003-02-04 2004-08-26 Fuji Photo Film Co Ltd 位相差板および楕円偏光板
JP2008165185A (ja) * 2006-12-07 2008-07-17 Nitto Denko Corp 積層光学フィルム、積層光学フィルムを用いた液晶パネル、および液晶表示装置
JP2009116342A (ja) * 2008-12-17 2009-05-28 Sharp Corp 反射型液晶表示装置
JP2011123252A (ja) * 2009-12-10 2011-06-23 Fujifilm Corp 液晶表示装置
JP2013190464A (ja) * 2012-03-12 2013-09-26 Konica Minolta Inc 偏光板の製造方法、偏光板及び液晶表示装置
WO2013137464A1 (fr) * 2012-03-15 2013-09-19 富士フイルム株式会社 Elément d'affichage el organique comprenant un stratifié optique
JP2014134775A (ja) * 2012-12-14 2014-07-24 Dainippon Printing Co Ltd 光学フィルム、光学フィルム用転写体、画像表示装置

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017083843A (ja) * 2015-10-30 2017-05-18 住友化学株式会社 偏光板
US10969527B2 (en) 2016-07-29 2021-04-06 Nitto Denko Corporation Polarizing plate with phase difference layers, and organic EL display device
TWI731228B (zh) * 2017-03-29 2021-06-21 日商大日本印刷股份有限公司 光學膜及影像顯示裝置
JP2021103302A (ja) * 2017-04-07 2021-07-15 富士フイルム株式会社 異方性光吸収膜および積層体
JP7118191B2 (ja) 2017-04-07 2022-08-15 富士フイルム株式会社 異方性光吸収膜および積層体
JPWO2019176918A1 (ja) * 2018-03-16 2021-03-25 富士フイルム株式会社 エレクトロルミネッセンス表示装置
WO2019176918A1 (fr) * 2018-03-16 2019-09-19 富士フイルム株式会社 Dispositifs d'affichage électroluminescent
US11665950B2 (en) 2018-03-16 2023-05-30 Fujifilm Corporation Electroluminescent display device
CN111869324A (zh) * 2018-03-23 2020-10-30 东洋纺株式会社 电致发光显示装置
CN111869324B (zh) * 2018-03-23 2024-02-27 东洋纺株式会社 电致发光显示装置
WO2019216076A1 (fr) * 2018-05-10 2019-11-14 住友化学株式会社 Stratifié optique et appareil d'affichage
JP2019197168A (ja) * 2018-05-10 2019-11-14 住友化学株式会社 光学積層体および表示装置
CN112946805A (zh) * 2019-12-11 2021-06-11 住友化学株式会社 圆偏振板
US11933998B2 (en) 2019-12-26 2024-03-19 3M Innovative Properties Company Film stacks for thin circular polarizers
US12253701B2 (en) 2019-12-26 2025-03-18 3M Innovative Properties Company Film stacks for thin circular polarizers

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