TW201719203A - Optical compensation layer-equipped polarizing plate and organic el panel using same - Google Patents

Abstract

Provided is an optical compensation layer-equipped polarizing plate which exhibits an excellent reflective color phase and excellent viewing angle characteristics. This optical compensation layer-equipped polarizing plate is to be used in an organic EL panel, and is equipped with a polarizer, a first optical compensation layer, and a second optical compensation layer, in this order. The first optical compensation layer exhibits refractive index properties satisfying nz > nx > ny, the Re(550) thereof is 5-150nm, and the Rth(550) thereof is -240 to -20nm. The second optical compensation layer exhibits refractive index properties satisfying nx > ny ≥ nz, the Re(550) thereof is 100-180nm, the Nz coefficient is 1.0-2.0, and the relationship Re(450) < Re(550) is satisfied.

Description

Polarizing plate with optical compensation layer and organic EL panel using the same

The present invention relates to a polarizing plate with an optical compensation layer and an organic EL panel using the same.

In recent years, with the spread of thin displays, the industry has proposed a display (organic EL display device) equipped with an organic EL panel. The organic EL panel has a highly reflective metal layer, and thus it is easy to cause problems such as reflection of external light or reflection of a background. Therefore, a method of preventing such problems by providing a circularly polarizing plate on the viewing side is known. As a general circularly polarizing plate, it is known that a retardation film (typically, a λ/4 plate) is laminated such that its slow axis forms an angle of about 45 with respect to the absorption axis of the polarizing element. Further, in order to further improve the antireflection property, it is attempted to laminate various retardation films (optical compensation layers) having optical characteristics. In such a circularly polarizing plate having a plurality of retardation films (optical compensation layers), there is a problem in that the order of lamination of the retardation film is changed (for example, in the case of two layers) due to manufacturing reasons or the like, In any of the front and oblique directions, the reflected hue shifts from the desired hue and the reflectance (eg, front reflectance) increases. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent No. 3325560

[Problems to be Solved by the Invention] The present invention has been made in order to solve the above-mentioned problems, and a main object thereof is to provide a polarizing plate with an optical compensation layer which can realize excellent reflection hue and viewing angle characteristics. [Technical means for solving the problem] The polarizing plate with an optical compensation layer of the present invention is used in an organic EL panel. The polarizing plate with the optical compensation layer is provided with a polarizing element, a first optical compensation layer, and a second optical compensation layer in this order. The first optical compensation layer exhibits a refractive index characteristic of nz>nx>ny, Re(550) is 5 nm to 150 nm, and Rth(550) is -240 nm to -20 nm; the second optical compensation layer is displayed The refractive index characteristics of nx>ny≧nz, Re(550) is 100 nm to 180 nm, the Nz coefficient is 1.0 to 2.0, and the relationship of Re(450)<Re(550) is satisfied. Here, Re(450) and Re(550) respectively represent the in-plane phase difference measured by light at wavelengths of 450 nm and 550 nm at 23 ° C, and Rth (550) represents a wavelength of 550 nm at 23 ° C. The phase difference in the thickness direction measured by the light. In one embodiment, the absorption axis direction of the polarizing element is substantially orthogonal or parallel to the slow axis direction of the first optical compensation layer, and the absorption axis of the polarizing element and the late phase axis of the second optical compensation layer The angle formed is 35° to 55°. In one embodiment, the second optical compensation layer is a retardation film obtained by obliquely extending. In one embodiment, the polarizing plate with the optical compensation layer is provided with a conductive layer and a substrate on the side opposite to the first optical compensation layer on the second optical compensation layer. According to another aspect of the present invention, an organic EL panel is provided. The organic EL panel includes the above-described polarizing plate with an optical compensation layer. [Effect of the Invention] According to the present invention, an optical compensation layer exhibiting a refractive index characteristic of nz>nx>ny is disposed on the polarizing element side in a polarizing plate having an optical compensation layer having two optical compensation layers. An optical compensation layer exhibiting a refractive index characteristic of nx>ny≧nz and exhibiting a wavelength dependence of inverse dispersion is disposed on a side away from the polarizing element, and further an in-plane retardation and a thickness direction of the two optical compensation layers The phase difference is optimized, whereby an optical compensation layer-attached polarizing plate capable of achieving excellent reflected hue and viewing angle characteristics can be obtained.

Hereinafter, preferred embodiments of the present invention will be described, but the present invention is not limited to the embodiments. (Definition of terms and symbols) The definitions of terms and symbols in this manual are as follows. (1) Refractive index (nx, ny, nz) The refractive index of the "nx" plane in which the refractive index becomes the largest (that is, the direction of the slow axis), and "ny" is the in-plane and the retarded axis. The refractive index in the direction (ie, the direction of the phase axis), and "nz" is the refractive index in the thickness direction. (2) In-plane phase difference (Re) "Re(λ)" is an in-plane phase difference measured by light having a wavelength of λ nm at 23 °C. Re (λ) is obtained by setting the thickness of the layer (film) to d (nm) according to the formula: Re = (nx - ny) × d. For example, "Re(550)" is an in-plane phase difference measured by light having a wavelength of 550 nm at 23 °C. (3) Phase difference in the thickness direction (Rth) "Rth(λ)" is a phase difference in the thickness direction measured by light having a wavelength of λ nm at 23 °C. Rth (λ) is obtained by setting the thickness of the layer (film) to d (nm) according to the formula: Rth = (nx - nz) × d. For example, "Rth(550)" is a phase difference in the thickness direction measured by light having a wavelength of 550 nm at 23 °C. (4) The Nz coefficient Nz coefficient is obtained from Nz = Rth / Re. (5) The expression of substantially orthogonal or parallel "substantially orthogonal" and "substantially orthogonal" includes the case where the angle formed by the two directions is 90 ° ± 10 °, preferably 90 ° ± 7 °, more Good is 90 ° ± 5 °. The expression "substantially parallel" and "substantially parallel" includes the case where the angle formed by the two directions is 0 ° ± 10 °, preferably 0 ° ± 7 °, more preferably 0 ° ± 5 °. Furthermore, in the present specification, only "orthogonal" or "parallel" may be used, and may include substantially orthogonal or substantially parallel states. A. Overall Configuration of Polarizing Plate with Optical Compensation Layer FIG. 1 is a schematic cross-sectional view of a polarizing plate with an optical compensation layer according to an embodiment of the present invention. The polarizing plate 100 with the optical compensation layer of the present embodiment includes the polarizing element 10, the first optical compensation layer 30, and the second optical compensation layer 40 in this order. Practically, the protective layer 20 may be provided on the opposite side of the polarizing element 10 from the first optical compensation layer 30 as shown in the example. Preferably, the polarizing plate 100 with the optical compensation layer does not contain an optically anisotropic layer between the polarizing element 10 and the first optical compensation layer 30. The optically anisotropic layer means, for example, a layer having an in-plane retardation Re (550) exceeding 10 nm, and/or a phase difference Rth (550) in the thickness direction of less than -10 nm or exceeding 10 nm. Examples of the optically anisotropic layer include a liquid crystal layer, a retardation film, and a protective film. In the case where the polarizing plate with the optical compensation layer does not contain the optically anisotropic layer, in one embodiment, the first optical compensation layer 30 functions as a protective layer of the polarizing element. In another embodiment, a protective layer having optical isotropy may be disposed between the polarizing element 10 and the first optical compensation layer 30 (ie, the opposite side of the polarizing element 10 from the protective layer 20) (hereinafter also referred to as It is the inner protective layer; not shown). Further, a conductive layer and a substrate (none of which are shown) may be sequentially disposed on the opposite side of the second optical compensation layer 40 from the first optical compensation layer 30 (that is, on the outer side of the second optical compensation layer 40). The substrate is laminated to the conductive layer. In the present specification, the term "adhesive laminate" means that two layers are directly and firmly laminated without interposing an adhesive layer (for example, an adhesive layer or an adhesive layer). The conductive layer and the substrate are typically introduced into the polarizing plate 100 with the optical compensation layer in the form of a laminate of the substrate and the conductive layer. By further providing the conductive layer and the substrate, the polarizing plate 100 with the optical compensation layer can be preferably used for the internal touch panel type input display device. The refractive index characteristic of the first optical compensation layer 30 exhibits a relationship of nz>nx>ny and has a slow phase axis. The slow phase axis of the first optical compensation layer 30 is substantially orthogonal or parallel to the absorption axis of the polarizing element 10. The refractive index characteristic of the second optical compensation layer 40 exhibits a relationship of nx>ny≧nz and has a slow phase axis. The angle between the slow phase axis of the second optical compensation layer 40 and the absorption axis of the polarizing element 10 is 35 to 55, preferably 38 to 52, more preferably 42 to 48, and even more preferably About 45°. If the above angle is such a range, an excellent anti-reflection function can be achieved. The second optical compensation layer 40 is typically composed of a retardation film obtained by obliquely extending. As described above, the first optical compensation layer exhibiting the refractive index characteristic of nz>nx>ny is disposed on the side of the polarizing element, and exhibits a refractive index characteristic of nx>ny≧nz and exhibits wavelength dependence of inverse dispersion. The second optical compensation layer is disposed on the side away from the polarizing element, whereby the increase in the reflectance due to the influence of the in-plane retardation of the first optical compensation layer can be suppressed, and the change in the reflected hue can be reduced. Further, such an effect is remarkable by optimizing the in-plane phase difference of the first optical compensation layer as will be described later. The polarizing plate with the optical compensation layer may be in the form of a single piece or a strip. Hereinafter, each layer constituting the polarizing plate with the optical compensation layer and the optical film will be described in detail. A-1. Polarizing Element As the polarizing element 10, any suitable polarizing element can be employed. For example, the resin film forming the polarizing element may be a single layer of a resin film, or may be a laminate of two or more layers. Specific examples of the polarizing element comprising a single-layer resin film include a hydrophilicity such as a polyvinyl alcohol (PVA) film, a partially formalized PVA film, or an ethylene-vinyl acetate copolymer partial saponified film. The molecular film is formed by dyeing and stretching treatment of a dichroic substance such as iodine or a dichroic dye; a dehydrated material of PVA or a polyolefin-based alignment film such as a dehydrochlorination product of polyvinyl chloride. In terms of excellent optical characteristics, it is preferred to use a polarizing element obtained by dyeing a PVA-based film with iodine and performing uniaxial stretching. The above dyeing with iodine is carried out, for example, by immersing a PVA-based film in an aqueous iodine solution. The stretching ratio of the uniaxial stretching is preferably from 3 to 7 times. The stretching can be carried out after the dyeing treatment, or can be carried out while dyeing one side. Further, it is also possible to perform dyeing after stretching. The PVA film is subjected to a swelling treatment, a crosslinking treatment, a washing treatment, a drying treatment, and the like as necessary. For example, by immersing the PVA-based film in water and washing it with water before dyeing, not only the dirt or the anti-caking agent on the surface of the PVA-based film can be washed, but also the PVA-based film can be swollen to prevent uneven dyeing. Specific examples of the polarizing element obtained by using the laminated body include a laminate using a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a resin substrate and coating. A polarizing element obtained by laminating a PVA-based resin layer formed on the resin substrate. A polarizing element obtained by using a resin substrate and a laminate of a PVA-based resin layer formed on the resin substrate can be produced, for example, by applying a PVA-based resin solution onto a resin substrate. The PVA-based resin layer was formed on the resin substrate by drying to obtain a laminate of the resin substrate and the PVA-based resin layer. The laminate was stretched and dyed to form a PVA-based resin layer as a polarizing element. In the present embodiment, the stretching is typically carried out by immersing the layered body in an aqueous boric acid solution for stretching. Further, the extension may optionally include extending the laminate in the air at a high temperature (for example, 95 ° C or higher) before extending in the aqueous boric acid solution. The laminated body of the obtained resin substrate/polarizing element can be used as it is (that is, the resin substrate can be used as a protective layer of the polarizing element), or the resin substrate can be peeled off from the laminated body of the resin substrate/polarizing element. The peeling area layer is used in any suitable protective layer corresponding to the purpose. The details of the method for producing such a polarizing element are described, for example, in Japanese Laid-Open Patent Publication No. 2012-73580. All the descriptions of this publication are incorporated herein by reference. The thickness of the polarizing element is preferably 25 μm or less, more preferably 1 μm to 12 μm, still more preferably 3 μm to 12 μm, and particularly preferably 3 μm to 8 μm. When the thickness of the polarizing element is in this range, the curl at the time of heating can be satisfactorily suppressed, and the appearance durability at the time of favorable heating can be obtained. The polarizing element preferably exhibits absorption dichroism at any wavelength of the wavelength of 380 nm to 780 nm. The monomer transmittance of the polarizing element is 43.0% to 46.0%, preferably 44.5% to 46.0%, as described above. The degree of polarization of the polarizing element is preferably 97.0% or more, more preferably 99.0% or more, and still more preferably 99.9% or more. A-2. First Optical Compensation Layer As described above, the refractive index characteristics of the first optical compensation layer 30 exhibit a relationship of nz>nx>ny. By providing the first optical compensation layer having such optical characteristics, the reflected hue when viewed from the oblique direction can be remarkably improved, and as a result, a polarizing plate with an optical compensation layer having excellent viewing angle characteristics can be obtained. Such a first optical compensation layer is usually provided on the side far from the polarizing element (for example, the outermost side of the polarizing plate with the optical compensation layer), but is provided on the side of the polarizing element according to the embodiment of the present invention. By adopting such a configuration, the in-plane phase difference of the optical compensation layer can be optimized as will be described later, and the influence of the retardation axis caused by the in-plane anisotropy of the first optical compensation layer can be avoided, and the reflection can be suppressed. The rate rises and the change in the reflected hue is made smaller. The in-plane retardation Re (550) of the first optical compensation layer is 5 nm to 150 nm, preferably 10 nm to 130 nm, and more preferably 20 nm to 130 nm. When the in-plane phase difference is in such a range, the reflectance can be suppressed from increasing, and excellent viewing angle characteristics and anti-reflection characteristics can be simultaneously achieved. The phase difference Rth (550) in the thickness direction of the first optical compensation layer is -240 nm to -20 nm, preferably -200 nm to -20 nm, more preferably -150 nm to -20 nm. When the phase difference in the thickness direction is in such a range, the increase in reflectance can be suppressed in the same manner as in the case where the in-plane phase difference is optimized, and excellent viewing angle characteristics and anti-reflection characteristics can be simultaneously achieved. The first optical compensation layer can be formed of any suitable material. The first optical compensation layer is preferably formed of a retardation film formed of a fumaric acid diester resin described in JP-A-2012-32784. The thickness of the first optical compensation layer is preferably from 5 μm to 80 μm, more preferably from 10 μm to 50 μm. A-3. Second Optical Compensation Layer As described above, the refractive index characteristic of the second optical compensation layer 40 exhibits a relationship of nx>ny≧nz. The in-plane retardation Re (550) of the second optical compensation layer is from 100 nm to 180 nm, preferably from 110 nm to 170 nm, more preferably from 120 nm to 160 nm. When the in-plane phase difference of the second optical compensation layer is in such a range, the retardation axis direction of the second optical compensation layer can be set to 35° to 55° as described above with respect to the absorption axis direction of the polarizing element ( In particular, an angle of about 45°), thereby achieving an excellent anti-reflection function. The second optical compensation layer exhibits wavelength dependence of the so-called inverse dispersion. Specifically, the in-plane phase difference satisfies the relationship of Re(450)<Re(550). By satisfying this relationship, an excellent reflected hue can be achieved. Re (450) / Re (550) is preferably 0.8 or more, less than 1, more preferably 0.8 or more and 0.95 or less. The Nz coefficient of the second optical compensation layer is from 1.0 to 2.0, preferably from 1.0 to 1.5, more preferably from 1.0 to 1.3. By satisfying this relationship, a more excellent reflective hue can be achieved. The water absorption ratio of the second optical compensation layer is preferably 3% or less, more preferably 2.5% or less, still more preferably 2% or less. By satisfying such a water absorption rate, temporal changes in display characteristics can be suppressed. Further, the water absorption rate can be obtained in accordance with JIS K 7209. The second optical compensation layer is typically a retardation film formed by any suitable resin. As the resin forming the retardation film, a polycarbonate resin is preferably used. As the polycarbonate resin, any suitable polycarbonate resin can be used as long as the effects of the present invention can be obtained. Preferably, the polycarbonate resin comprises: a structural unit derived from an anthracene dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and a source derived from an alicyclic diol, an alicyclic dimethanol, a structural unit of at least one dihydroxy compound in the group consisting of polyethylene glycol, and alkanediol or spirodiol. Preferably, the polycarbonate resin comprises: a structural unit derived from an oxime dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and a structural unit derived from an alicyclic dimethanol and/or derived from a structural unit derived from tris or polyethylene glycol; more preferably comprising: a structural unit derived from a quinone dihydroxy compound, a structural unit derived from an isosorbide dihydroxy compound, and derived from a second, third or polyethyl a structural unit of a diol. The polycarbonate resin may also contain structural units derived from other dihydroxy compounds as needed. In addition, the details of the polycarbonate resin which can be suitably used in the present invention are described, for example, in JP-A-2014-10291, and JP-A-2014-26266, the disclosure of which is incorporated herein by reference. in. The glass transition temperature of the polycarbonate resin is preferably 110 ° C or more and 180 ° C or less, more preferably 120 ° C or more and 165 ° C or less. When the glass transition temperature is too low, heat resistance tends to be deteriorated, and there is a possibility that dimensional change occurs after film formation, and the image quality of the obtained organic EL panel is lowered. If the glass transition temperature is too high, the molding stability at the time of film formation may be deteriorated, and the transparency of the film may be impaired. Further, the glass transition temperature was determined in accordance with JIS K 7121 (1987). The molecular weight of the above polycarbonate resin can be expressed by the specific viscosity. The specific viscosity was determined by using dichloromethane as a solvent, and the polycarbonate concentration was accurately prepared to 0.6 g/dL, and the temperature was measured at 20.0 ° C ± 0.1 ° C using a Ubbelohs viscosity tube. The lower limit of the rich viscosity is usually preferably 0.30 dL/g, more preferably 0.35 dL/g or more. The upper limit of the rich viscosity is usually preferably 1.20 dL/g, more preferably 1.00 dL/g, and still more preferably 0.80 dL/g. When the specific viscosity is less than the above lower limit, there is a problem that the mechanical strength of the molded article becomes small. On the other hand, when the specific viscosity is larger than the above upper limit, there is a problem that the fluidity at the time of molding is lowered and the productivity or moldability is lowered. The retardation film is produced by extending the resin film in at least one direction. As a method of forming the above resin film, any appropriate method can be employed. Examples thereof include a melt extrusion method (for example, a T-die molding method), a casting coating method (for example, a casting method), a calender molding method, a hot pressing method, a co-extrusion method, a co-melting method, a multilayer extrusion method, and an inflation molding method. Law and so on. It is preferred to use a T-die forming method, a casting method, and an inflation forming method. The thickness of the resin film (unstretched film) can be set to any appropriate value in accordance with desired optical characteristics, elongation conditions to be described later, and the like. It is preferably 50 μm to 300 μm. The above extension may employ any suitable extension method, extension conditions (e.g., extension temperature, extension ratio, extension direction). Specifically, various extension methods such as free end extension, fixed end extension, free end contraction, and fixed end contraction may be used simultaneously or sequentially. The extending direction may be performed in various directions or dimensions such as a horizontal direction, a vertical direction, a thickness direction, and a diagonal direction. The glass transition temperature (Tg) with respect to the resin film is preferably from Tg -30 ° C to Tg + 60 ° C, more preferably from Tg - 10 ° C to Tg + 50 ° C. A retardation film having the above-described desired optical characteristics (for example, refractive index characteristics, in-plane retardation, and Nz coefficient) can be obtained by appropriately selecting the above-described stretching method and stretching conditions. In one embodiment, the retardation film is produced by continuously extending the elongated resin film obliquely in the direction of the angle θ with respect to the longitudinal direction. By using an oblique extension, an elongated stretch film having an alignment angle (latial phase axis in the direction of the angle θ) with respect to the longitudinal direction of the film can be obtained, for example, when laminated with a polarizing element. Achieve roll-to-roll simplification of manufacturing steps. Since the absorption axis of the polarizing element is expressed in the longitudinal direction or the width direction of the elongated film by the manufacturing method thereof, the angle θ may be an angle formed by the absorption axis of the polarizing element and the slow axis of the second optical compensation layer. Examples of the stretching machine used for the oblique stretching include a tenter type stretching machine capable of adding a feed force, a tensile force, or a winding force at different speeds in the lateral direction and/or the longitudinal direction. The tenter type extender includes a lateral uniaxial stretching machine, a simultaneous biaxial stretching machine, and the like, but any suitable stretching machine can be used as long as the elongated resin film can be continuously extended obliquely. The thickness of the retardation film (the stretched film, that is, the second optical compensation layer) is preferably 20 μm to 100 μm, more preferably 20 μm to 80 μm, still more preferably 20 μm to 65 μm. If it is such a thickness, the above-mentioned desired in-plane phase difference and thickness direction phase difference can be obtained. A-4. Laminate The in-plane retardation Re (550) of the laminate of the first optical compensation layer and the second optical compensation layer is 120 nm to 160 nm, preferably 130 nm to 150 nm. The phase difference Rth (550) in the thickness direction of the laminate is -40 nm to 80 nm, preferably -20 nm to 50 nm. By setting the optical characteristics of the laminated body in this way, the reflected hue when viewed from the oblique direction can be remarkably improved, and as a result, a polarizing plate with an optical compensation layer having excellent viewing angle characteristics can be obtained. A-5. Protective Layer The protective layer 20 is formed of any suitable film that can be used as a protective layer for the polarizing element. Specific examples of the material which is a main component of the film include a cellulose resin such as triethyl cellulose (TAC), or a polyester resin, a polyvinyl alcohol resin, a polycarbonate resin or a polyamido compound. Polyimine, polyether oxime, polyfluorene, polystyrene, polycondensate A transparent resin such as an olefin, a polyolefin, a (meth)acrylic or an acetate. Further, examples thereof include thermosetting resins such as (meth)acrylic acid, urethane-based, (meth)acrylic acid urethane-based, epoxy-based, and polyfluorene-based resins, and ultraviolet curable resins. Wait. Other than this, for example, a glass-based polymer such as a siloxane-based polymer may be mentioned. Further, a polymer film described in JP-A-2001-343529 (WO01/37007) can also be used. As the material of the film, for example, a thermoplastic resin having a substituted or unsubstituted quinone imine group in a side chain, and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in a side chain can be used. The resin composition may, for example, be a resin composition having an alternating copolymer of isobutylene and N-methylmaleimide and an acrylonitrile-styrene copolymer. Such a polymer film can be, for example, an extrusion molded product of the above resin composition. The protective layer 20 may also be subjected to surface treatment such as hard coating treatment, anti-reflection treatment, anti-stick treatment, anti-glare treatment, etc. as needed. Further, or in addition, the protective layer 20 may be subjected to a process of improving the visibility when viewed by polarizing sunglasses (representatively, an (elliptical) circular polarizing function is imparted, and an ultra-high phase difference is imparted). By performing such a process, excellent visibility can be achieved even when the display screen is viewed through a polarizer such as polarized sunglasses. Therefore, the polarizing plate with the optical compensation layer can also be suitably used for an image display device that can be used outdoors. The thickness of the protective layer 20 is typically 5 mm or less, preferably 1 mm or less, more preferably 1 μm to 500 μm, and still more preferably 5 μm to 150 μm. Further, in the case of performing the surface treatment, the thickness of the protective layer is the thickness including the thickness of the surface treatment layer. When the inner protective layer is provided between the polarizing element 10 and the first optical compensation layer 30, the inner protective layer is preferably optically isotropic as described above. In the present specification, the term "optical isotropic" means that the in-plane retardation Re (550) is 0 nm to 10 nm, and the phase difference Rth (550) in the thickness direction is -10 nm to +10 nm. The inner protective layer may be composed of any suitable material as long as it is optically isotropic. This material can be suitably selected, for example, from the materials described with respect to the protective layer 20. The thickness of the inner protective layer is preferably from 5 μm to 200 μm, more preferably from 10 μm to 100 μm, still more preferably from 15 μm to 95 μm. A-6. Conductive layer or conductive layer with a base material conductive layer can be formed by any suitable film forming method (for example, vacuum evaporation method, sputtering method, CVD method, ion plating method, spray method, etc.) The metal oxide film is formed into a film on any suitable substrate. After the film formation, heat treatment (for example, 100 ° C to 200 ° C) may be performed as needed. The amorphous film can be crystallized by heat treatment. Examples of the metal oxide include indium oxide, tin oxide, zinc oxide, indium-tin composite oxide, tin-bismuth composite oxide, zinc-aluminum composite oxide, and indium-zinc composite oxide. The indium oxide may also be doped with a divalent metal ion or a tetravalent metal ion. It is preferably an indium composite oxide, more preferably an indium-tin composite oxide (ITO). The indium composite oxide has a characteristic of having a high transmittance (for example, 80% or more) in a visible light region (380 nm to 780 nm) and a low surface resistance value per unit area. In the case where the conductive layer contains a metal oxide, 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 resistivity of the conductive layer is preferably 300 Ω/□ or less, more preferably 150 Ω/□ or less, and still more preferably 100 Ω/□ or less. The conductive layer may be transferred from the substrate to the second optical compensation layer, and only the conductive layer may be a constituent layer of a polarizing plate with an optical compensation layer, or may be a laminated body with a substrate (a conductive layer with a substrate) The form is laminated on the second optical compensation layer. Typically, as described above, the conductive layer and the substrate can be introduced as a conductive layer with a substrate to a polarizing plate with an optical compensation layer. As a material which comprises a base material, any suitable resin is mentioned. A resin excellent in transparency is preferred. Specific examples thereof include a cyclic olefin resin, a polycarbonate resin, a cellulose resin, a polyester resin, and an acrylic resin. Preferably, the substrate is optically isotropic, and thus the conductive layer can be used as a polarizing plate with an optical compensation layer as a conductive layer with an isotropic substrate. Examples of the material constituting the optically isotropic substrate (isotropic substrate) include, for example, A material which does not have a conjugated resin as a main skeleton, such as an olefin resin or an olefin resin, and a material having a cyclic structure such as a lactone ring or a quinodiimine ring in the main chain of the acrylic resin. When such a material is used, when an isotropic substrate is formed, the phase difference exhibited by the alignment of the molecular chain can be suppressed to be small. The thickness of the substrate is preferably from 10 μm to 200 μm, more preferably from 20 μm to 60 μm. A-7. Other suitable adhesive layer or adhesive layer may be used in the laminate constituting each layer of the polarizing plate with the optical compensation layer of the present invention. The adhesive layer is typically formed of an acrylic adhesive. The subsequent layer is typically formed of a polyvinyl alcohol-based adhesive. Although not shown, an adhesive layer may be provided on the second optical compensation layer 40 side of the polarizing plate 100 with the optical compensation layer. By attaching an adhesive layer in advance, it can be easily attached to other optical members (for example, an organic EL unit). Further, it is preferred that a release film is bonded to the surface of the adhesive layer before use. B. Manufacturing Method As a method of manufacturing the polarizing plate with the optical compensation layer described above, any appropriate method can be employed. In one embodiment, the polarizing plate with the optical compensation layer can be manufactured by a method comprising the steps of: forming a long resin film constituting the protective layer, and a polarizing element having an elongated absorption axis in the longitudinal direction. The step of laminating the long optical laminate layers of the first optical compensation layer and the second optical compensation layer in the longitudinal direction and aligning them in the longitudinal direction of each. The protective layer, the polarizing element, and the laminated body may be laminated at the same time, or the protective layer may be laminated with the polarizing element first, or the polarizing element may be first laminated with the laminated layer. In another embodiment, the polarizing plate with the optical compensation layer can be produced by a method comprising the steps of: forming a long resin film constituting the protective layer, and having an elongated shape and having an absorption axis in the longitudinal direction. a step of obtaining a laminated film by laminating a polarizing element; a step of applying a first optical compensation layer on the surface of the polarizing element while transporting the laminated film; and a laminated film in which the first optical compensation layer is formed and constituting the second optical The step of compensating for the long strip-shaped phase difference film of the layer. Here, the angle formed by the absorption axis of the polarizing element 10 and the slow axis of the second optical compensation layer 40 is 35 to 55, preferably 38 to 52, more preferably 42 to 48. °, and more preferably about 45°. In the present embodiment, the long retardation film constituting the second optical compensation layer has a slow phase axis in the direction of the angle θ with respect to the longitudinal direction thereof. The angle θ may be an angle formed by the absorption axis of the polarizing element and the slow axis of the first optical compensation layer as described above. Such a retardation film can be obtained by obliquely extending. According to this configuration, roll-to-roll can be realized in the manufacture of the polarizing plate with the optical compensation layer as described above, thereby significantly shortening the manufacturing steps. C. Organic EL panel The organic EL panel of the present invention includes an organic EL unit and a polarizing plate with an optical compensation layer described in the above-mentioned item A on the viewing side of the organic EL unit. The polarizing plate with the optical compensation layer is laminated such that the second optical compensation layer is on the side of the organic EL unit (the polarizing element is on the viewing side). EXAMPLES Hereinafter, the present invention will be specifically described by examples, but the present invention is not limited by the examples. Furthermore, the measurement method of each characteristic is as follows. (1) The thickness was measured using a dial gauge (manufactured by PEACOCK, product name "DG-205", and a dial gauge test stand (product name "pds-2"). (2) Phase difference A sample of 50 mm × 50 mm was cut out from each optical compensation layer to prepare a measurement sample, which was measured using Axoscan manufactured by Axometrics. The measurement wavelength was 450 nm, 550 nm, and the measurement temperature was 23 °C. Further, the average refractive index was measured using an Abbe refractometer manufactured by Atago Co., Ltd., and the refractive indices nx, ny, and nz were calculated from the obtained phase difference values. (3) The water absorption rate is measured in accordance with the "Test method for water absorption rate and boiling water absorption rate of plastics" described in JIS K 7209. The size of the test piece was a square with a side length of 50 mm. The test piece was immersed in water at a water temperature of 25 ° C for 24 hours, and then the weight change before and after the water immersion was measured. Unit is%. (4) Reflected Hue and Viewing Angle Characteristics A black image was displayed on the obtained organic EL panel, and the reflected hue was measured using a cone spectroscope (conoscope) manufactured by Auoronic-MERCHERS. The "viewing angle characteristic" indicates the distance Δxy between the two points of the reflected hue in the front direction and the reflected hue in the oblique direction (the maximum or minimum value at the polar angle of 45°) in the xy chromaticity diagram of the CIE color system. When the Δxy is less than 0.15, the viewing angle characteristics are evaluated as good. (5) Front Reflectance A black image was displayed on the obtained organic EL panel, and the front reflectance was measured using a spectrophotometer CM-2600d manufactured by Konica Minolta. When the reflectance is less than 20 (%), it is evaluated that the reflection characteristics are good. [Example 1] (Production of the first optical compensation layer) Hydroxypropyl methylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd.) was added as a dispersing agent to a 1-liter reactor equipped with a stirrer, a condenser, a nitrogen gas inlet tube, and a thermometer. Product name Metolose 60SH-50) 2.3 g, distilled water 600 g, diisopropyl fumarate 358 g, diethyl fumarate 42 g (11.7 parts by weight relative to 100 parts by weight of diisopropyl fumarate) 10 g of methyl isobutyl ketone (2.4 parts by weight based on 100 parts by weight of total diisopropyl fumarate and diethyl fumarate) and third peroxidic pivalic acid as a polymerization initiator 3.1 g of butyl ester was subjected to nitrogen gas flow for 1 hour, and while maintaining at 400 rpm for 24 hours while stirring at 400 rpm, suspension radical polymerization was carried out. After the completion of the polymerization reaction, the content was recovered from the reactor, and the polymer was separated by filtration, washed 5 times with distilled water 2000 g, washed 5 times with methanol 2000 g, and vacuum dried at 80 ° C for 6 hours to obtain a rich 310 g of a maleic acid diester polymer. The obtained fumaric acid diester was dissolved in MIBK, and the coating liquid was applied onto PET, dried at 80 ° C for 5 minutes, and further dried at 130 ° C for 5 minutes, thereby preparing a phase difference layer (nz). >nx=ny). Further, a retardation layer having a refractive index characteristic of nz>nx>ny is formed by performing the stretching treatment, and the retardation layer is used as the first optical compensation layer. (Production of Polycarbonate Resin Film) Polymerization was carried out using a batch polymerization apparatus including two vertical reactors equipped with a stirring blade and a reflux condenser controlled to 100 °C. 9,9-[4-(2-hydroxyethoxy)phenyl]indole (BHEPF), isosorbide (ISB), diethylene glycol (DEG), diphenyl carbonate (DPC), and magnesium acetate The tetrahydrate was charged in such a manner that the molar ratio became BHEPF/ISB/DEG/DPC/magnesium acetate = 0.348/0.490/0.162/1.005/1.00×10 ^-5 . After the inside of the reactor was sufficiently purged with nitrogen (oxygen concentration: 0.0005 to 0.001 vol%), the mixture was heated by a heat medium, and stirring was started at a time when the internal temperature became 100 °C. After 40 minutes from the start of the temperature rise, the internal temperature was brought to 220 ° C, and the temperature was maintained to control, and the pressure was started. After reaching 220 ° C, it was set to 13.3 kPa in 90 minutes. The phenol vapor produced by the polymerization reaction is introduced into a reflux condenser at 100 ° C, and a certain amount of the monomer component in the phenol vapor is returned to the reactor, and the non-condensed phenol vapor is introduced to 45 ° C. The condenser is recycled. After introducing nitrogen gas into the first reactor and temporarily returning it to atmospheric pressure, the oligomerized reaction liquid in the first reactor was transferred to the second reactor. Next, the temperature rise and pressure reduction in the second reactor were started, and the internal temperature was 240 ° C and the pressure was 0.2 kPa in 50 minutes. Thereafter, polymerization is carried out until a specific stirring power is obtained. When the specific power is reached, the nitrogen gas is introduced into the reactor to restore the pressure, and the reaction liquid is taken out in the form of strands, and granulated by a rotary cutter to obtain BHEPF/ISB/DEG=34.8/49.0/16.2 [mol %] copolymerized polycarbonate resin. The polycarbonate resin had a specific viscosity of 0.430 dL/g and a glass transition temperature of 128 °C. (Production of the second optical compensation layer) The obtained polycarbonate resin was vacuum dried at 80 ° C for 5 hours, and then used as a single-axis extruder (manufactured by Isuzu Chemical Co., Ltd., screw diameter of 25 mm, material cylinder) Set temperature: 220 ° C), T-die (width 900 mm, set temperature: 220 ° C), cooling roll (set temperature: 125 ° C) and film forming device of coiler to make polycarbonate with a thickness of 130 μm Ester resin film. The water absorption of the obtained polycarbonate resin film was 1.2%. The polycarbonate resin film obtained in the above manner was obliquely stretched by the method of Example 1 of JP-A-2014-194483 to obtain a retardation film. The specific fabrication sequence of the retardation film was as follows: A polycarbonate resin film (thickness 130 μm, width 765 mm) was preheated to 142 ° C in the preheating zone of the stretching device. In the preheating zone, the clamp spacing of the left and right clamps is 125 mm. Next, while the film enters the first obliquely extending region C1, the jig spacing of the right jig is increased, increasing from 125 mm to 177.5 mm in the first oblique extending region C1. The change rate of the clamp spacing was 1.42. In the first oblique extension C1, the jig spacing of the left clamp is reduced to reduce the clamp pitch from 125 mm to 90 mm in the first oblique extension C1. The change rate of the jig spacing was 0.72. Further, while the film enters the second oblique extending portion C2, the jig pitch of the left jig is increased, and is increased from 90 mm to 177.5 mm in the second oblique extending portion C2. On the other hand, the jig pitch of the right jig is maintained at 177.5 mm in the second oblique extension C2. Further, the oblique direction is also extended by 1.9 times in the width direction. Furthermore, the above oblique stretching was carried out at 135 °C. Next, the MD shrinkage treatment is performed in the contraction zone. Specifically, the jig spacing between the left and right clamps was reduced from 177.5 mm to 165 mm. The shrinkage in the MD shrinkage treatment was 7.0%. A retardation film (thickness 40 μm) was obtained in the above manner. The retardation film obtained had a Re (550) of 147 nm and an Rth (550) of 167 nm (nx: 1.5977, ny: 1.59404, nz: 1.5935), and showed a refractive index characteristic of nx>ny=nz. Further, Re (450) / Re (550) of the obtained retardation film was 0.89. The retardation axis direction of the retardation film is 45° with respect to the longitudinal direction. (Production of a laminate) The retardation layer (first optical compensation layer) is bonded to the retardation film (second optical compensation layer) via an acrylic adhesive, and then the substrate is bonded to the substrate The film was removed, and a laminate in which a retardation layer (first optical compensation layer) was transferred onto a retardation film (second optical compensation layer) was obtained. (Production of polarizing element) The long reel of a polyvinyl alcohol (PVA) resin film (manufactured by Kuraray Co., Ltd., product name "PE3000") having a thickness of 30 μm was 5.9 times longer in the longitudinal direction by a roll stretching machine. In the manner of uniaxial stretching in the longitudinal direction, swelling, dyeing, cross-linking, and cleaning treatment were simultaneously performed, and finally, drying treatment was performed to prepare a polarizing element having a thickness of 12 μm. Specifically, the swelling treatment was extended to 2.2 times while being treated by pure water at 20 °C. Next, the dyeing treatment was carried out while the monomer transmittance of the obtained polarizing element was 45.0%, and the treatment was carried out in an aqueous solution having an iodine concentration adjusted to a weight ratio of iodine to potassium iodide of 1:7 at 30 °C. Up to 1.4 times. Further, the cross-linking treatment was carried out by a two-stage cross-linking treatment, and the first-stage cross-linking treatment was carried out while being treated at 40 ° C in an aqueous solution of boric acid and potassium iodide, and was extended to 1.2 times. The boric acid content of the aqueous solution of the first stage crosslinking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight. The second-stage crosslinking treatment was carried out while being treated at 65 ° C in an aqueous solution of boric acid and potassium iodide, and was extended to 1.6 times. The boric acid content of the aqueous solution of the second stage crosslinking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight. Further, the cleaning treatment was carried out by a potassium iodide aqueous solution at 20 °C. The potassium iodide content of the aqueous solution of the cleaning treatment was set to 2.6% by weight. Finally, the drying treatment was carried out by drying at 70 ° C for 5 minutes to obtain a polarizing element. (Production of Polarizing Plate) On one side of the above-mentioned polarizing element, a hard coating (HC) formed by hard coating treatment is applied to one side of a TAC film by roll-to-rolling via a polyvinyl alcohol-based adhesive. A layer of HC-TAC film (thickness: 32 μm, corresponding to the protective layer) was obtained to obtain a long polarizing plate having a protective layer/polarizing element. (Production of Polarizing Plate with Optical Compensation Layer) The first embodiment of the polarizing plate of the polarizing plate obtained above and the laminated body of the first optical compensation layer/second optical compensation layer obtained above are obtained via an acrylic adhesive. (1) The optical compensation layer is bonded by roll-to-roll, and a long polarizing plate with an optical compensation layer having a protective layer/polarizing element/first optical compensation layer/second optical compensation layer is obtained. (Production of Organic EL Panel) On the second optical compensation layer side of the obtained polarizing plate with an optical compensation layer, an adhesive layer was formed by an acrylic adhesive, and the size was cut out to be 50 mm × 50 mm. The smart phone (Galaxy-S5) manufactured by Samsung Wireless Co., Ltd. is decomposed and the organic EL panel is taken out. The polarizing film attached to the organic EL panel was peeled off, and the polarizing plate with the optical compensation layer cut out as described above was attached thereto to obtain an organic EL panel. The reflection characteristics of the obtained organic EL panel were measured by the order of the above (4). As a result, it was confirmed that a neutral reflection hue was realized in any direction in the front direction and the oblique direction. Further, the results of the viewing angle characteristics and the front reflectance are shown in Table 1. [Table 1] [Examples 2 to 6 and Comparative Examples 1 to 7] A polarizing plate with an optical compensation layer and an organic EL panel were produced by the configuration shown in Table 1. Further, in Comparative Examples 1 to 3, the order of lamination of the optical compensation layer and the second optical compensation layer was substantially reversed with respect to Examples 3 to 5, respectively. The obtained polarizing plate with an optical compensation layer and an organic EL panel were subjected to the same evaluation as in Example 1. As shown in Table 1, the viewing angle characteristics and the front reflectance of the organic EL panels of Examples 2 to 6 were good. Further, regarding these organic EL panels, it was confirmed that a neutral reflective hue was realized in any of the front direction and the oblique direction. On the other hand, the organic EL panels of Comparative Examples 1 to 7 had insufficient front reflectance and insufficient antireflection characteristics. [Industrial Applicability] The polarizing plate with an optical compensation layer of the present invention can be preferably used for an organic EL panel.

10‧‧‧Polarized components
20‧‧‧Protective layer
30‧‧‧1st optical compensation layer
40‧‧‧2nd optical compensation layer
100‧‧‧Polarizer with optical compensation layer

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a polarizing plate with an optical compensation layer according to an embodiment of the present invention.

10‧‧‧Polarized components

20‧‧‧Protective layer

30‧‧‧1st optical compensation layer

40‧‧‧2nd optical compensation layer

100‧‧‧Polarizer with optical compensation layer

Claims (6)

A polarizing plate with an optical compensation layer, which is provided with a polarizing element, a first optical compensation layer and a second optical compensation layer in this order, and the first optical compensation layer exhibits a refractive index characteristic of nz>nx>ny, Re( 550) is 5 nm to 150 nm, and Rth (550) is -240 nm to -20 nm. The second optical compensation layer exhibits a refractive index characteristic of nx>ny≧nz, and Re(550) is 100 nm to 180 nm. The Nz coefficient is 1.0 to 2.0, and satisfies the relationship of Re(450)<Re(550), and is used in an organic EL panel; here, Re(450) and Re(550) respectively represent at 23 ° C The in-plane phase difference measured by light at wavelengths of 450 nm and 550 nm, and Rth (550) represents the phase difference in the thickness direction measured by light having a wavelength of 550 nm at 23 °C. A polarizing plate with an optical compensation layer as claimed in claim 1, wherein an absorption axis direction of the polarizing element is substantially orthogonal or parallel to a slow axis direction of the first optical compensation layer, and an absorption axis of the polarizing element and the above The angle formed by the slow phase axis of the second optical compensation layer is 35° to 55°. A polarizing plate with an optical compensation layer as claimed in claim 1, wherein the second optical compensation layer is a retardation film obtained by obliquely extending. A polarizing plate with an optical compensation layer as claimed in claim 2, wherein the second optical compensation layer is a retardation film obtained by obliquely extending. The polarizing plate with an optical compensation layer according to any one of claims 1 to 4, wherein the conductive layer and the substrate are sequentially provided on the opposite side of the second optical compensation layer from the first optical compensation layer. An organic EL panel comprising the polarizing plate with an optical compensation layer as claimed in any one of claims 1 to 5.