TW201734518A - Polarizing plate with optical compensation layer, and organic el panel using said polarizing plate - Google Patents

Abstract

Provided is a polarizing plate with an optical compensation layer, wherein the hue in the oblique direction is neutral. The polarizing plate with an optical compensation layer is used in an organic EL panel. The polarizing plate with an optical compensation layer comprises a polarizer and an optical compensation layer. The optical compensation layer exhibits refractive index characteristics of nx > nz > ny and satisfies the relation Re(450) < Re(550). In one embodiment, the Re(550) of the optical compensation layer is 100nm-180nm, and the Nz coefficient is 0.3-0.7. In one embodiment, the angle formed by the absorption axis of the polarizer and the slow axis of the optical compensation layer is 35 DEG to 55 DEG.

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, displays (organic EL display devices) equipped with an organic EL panel have been proposed. 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, it is known to prevent such problems by providing a circular polarizing plate on the viewing side. As a general circularly polarizing plate, it is known that a retardation film (typically, a λ/4 plate) is laminated such that its retardation axis forms an angle of about 45 with the absorption axis of the polarizing element. In addition to this, in order to further improve the anti-reflection characteristics, it is attempted to laminate a retardation film (optical compensation layer) having various optical characteristics. However, the prior circular polarizing plates have a problem that the hue of the oblique direction has an undesired chromatic aberration. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent No. 3325560

[Problem to be Solved by the Invention] The present invention has been made to solve the above-mentioned problems, and a main object thereof is to provide a polarizing plate with an optical compensation layer having a neutral hue in a diagonal direction. [Technical means for solving the problem] The polarizing plate with an optical compensation layer of the present invention is used for an organic EL panel. The polarizing plate with the optical compensation layer is provided with a polarizing element and an optical compensation layer. The optical compensation layer exhibits a refractive index characteristic of nx>nz>ny and satisfies the relationship of Re(450)<Re(550). Here, Re(450) and Re(550) respectively represent the in-plane phase difference measured by light having a wavelength of 450 nm and 550 nm at 23 °C. In one embodiment, the optical compensation layer has a Re (550) of 100 nm to 180 nm and an Nz coefficient of 0.3 to 0.7. In one embodiment, an angle formed between an absorption axis of the polarizing element and a retardation axis of the optical compensation layer is 35° to 55°. 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. [Effects of the Invention] According to the present invention, an optical compensation layer exhibiting a refractive index characteristic of nx &gt; nz &gt; ny and exhibiting a reverse wavelength dispersion characteristic can be obtained by using a polarizing plate with an optical compensation layer, and a hue in an oblique direction can be obtained. Neutral polarizer with optical compensation layer.

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) by 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. When Rth(λ) is a thickness (d) of a layer (film), it is obtained by 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 by Nz=Rth/Re. (5) In fact, the expressions of "normally orthogonal" and "substantially orthogonal" in orthogonal or parallel directions include the case where the angle formed by the two directions is 90° ± 10°, preferably 90° ± 7°, and further It is preferably 90 ° ± 5 °. The expressions "actually parallel" and "substantially parallel" include the case where the angle formed by the two directions is 0 ° ± 10 °, preferably 0 ° ± 7 °, and further preferably 0 ° ± 5 °. Furthermore, in the present specification, only "orthogonal" or "parallel" may be included, 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 an optical compensation layer according to this embodiment includes a polarizing element 10 and an optical compensation layer 30. In terms of practicality, the protective layer 20 may be disposed on the opposite side of the polarizing element 10 from the optical compensation layer 30 as illustrated. Further, the polarizing plate with the optical compensation layer may have another protective layer (also referred to as an inner protective layer) between the polarizing element 10 and the optical compensation layer 30. In the illustrated example, the inner protective layer is omitted. In this case, the optical compensation layer 30 can also function as an inner protective layer. According to this configuration, the polarizing plate with the optical compensation layer can be further reduced in thickness. Further, a conductive layer and a substrate (none of which are shown) may be sequentially disposed on the opposite side of the optical compensation layer 30 from the polarizing element 10 (that is, on the outer side of the optical compensation layer 30). The substrate is densely laminated on the conductive layer. In the present specification, the term "adhesive laminate" means that two layers are directly and closely 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 optical compensation layer 30 exhibits a relationship of nx>nz>ny and has a slow phase axis. The angle between the slow phase axis of the optical compensation layer 30 and the absorption axis of the polarizing element 10 is preferably from 35 to 55, more preferably from 38 to 52, still more preferably from 42 to 48, and particularly preferably About 45°. If the above angle is such a range, excellent anti-reflection characteristics can be achieved. Further, the optical compensation layer 30 satisfies the relationship of Re(450)<Re(550). That is, the optical compensation layer 30 exhibits a reverse wavelength dispersion characteristic in which the phase difference value becomes larger depending on the wavelength of the measurement light. By using an optical compensation layer exhibiting a relationship of nx>nz>ny and exhibiting a reverse wavelength dispersion characteristic using a refractive index characteristic, a hue which is neutral in the oblique direction (that is, there is no undesired chromatic aberration) can be realized. The in-plane retardation Re (550) of the optical compensation layer 30 is preferably from 100 nm to 180 nm. The Nz coefficient of the optical compensation layer 30 is preferably from 0.3 to 0.7. Hereinafter, each layer constituting the polarizing plate with the optical compensation layer and an optical film will be described in detail. A-1. Polarizing Element As the polarizing element 10, any appropriate 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 composed of a single-layer resin film include hydrophilicity such as a polyvinyl alcohol (PVA) film, a partially formalized PVA film, or an ethylene-vinyl acetate copolymer partially saponified film. The polymer film is subjected to a dyeing treatment and elongation treatment using a dichroic substance such as iodine or a dichroic dye; a polyene-based alignment film such as a dehydrated material of PVA or a dehydrochlorination treatment of polyvinyl chloride. In terms of excellent optical characteristics, a polarizing element obtained by dyeing a PVA-based film with iodine and performing uniaxial stretching is preferably used. The above dyeing with iodine is carried out, for example, by immersing the 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 stain or anti-blocking agent on the surface of the PVA film can be washed, but also the PVA film can be swollen to prevent uneven dyeing. Specific examples of the polarizing element obtained by using the laminated body include a laminated body 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 laminate of a resin substrate and a PVA-based resin layer formed on the resin substrate can be produced, for example, by applying a PVA-based resin solution to a resin substrate and drying it. On the other hand, a PVA-based resin layer is formed on a resin substrate to obtain a laminate of a resin substrate and a PVA-based resin layer. The laminate is 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 laminate in an aqueous solution of boric acid and extending it. Further, the stretching may further include a case where the laminate is air-extended at a high temperature (for example, 95 ° C or higher) before stretching in an aqueous boric acid solution as needed. 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 surface is used by stacking any appropriate protective layer depending on 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. The entire disclosure of this publication is 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, still more preferably 3 μm to 8 μm. When the thickness of the polarizing element is in such a range, the curl at the time of heating can be satisfactorily suppressed, and the appearance durability at the time of good heating can be obtained. The polarizing element preferably exhibits absorption dichroism at any wavelength from 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, still more preferably 99.9% or more. A-2. Optical Compensation Layer The optical compensation layer 30 has a refractive index characteristic exhibiting a relationship of nx>nz>ny as described above. The in-plane retardation Re(550) of the optical compensation layer is preferably from 100 nm to 180 nm, more preferably from 110 nm to 170 nm, further preferably from 120 nm to 160 nm, and particularly preferably from 130 nm to 150 nm. If the in-plane phase difference of the optical compensation layer is in such a range, the direction of the slow axis of the optical compensation layer and the absorption axis direction of the polarizing element can be 35° to 55° (especially about 45°) as described above. The angle is set in a manner to achieve excellent anti-reflection characteristics. The optical compensation layer exhibits reverse wavelength dispersion characteristics as described above. Specifically, the in-plane phase difference satisfies the relationship of Re(450)<Re(550). Further, the in-plane phase difference of the optical compensation layer preferably satisfies the relationship of Re (550) < Re (650). By using a circularly polarizing plate for an organic EL panel, an optical compensation layer exhibiting a relationship of nx>nz>ny with a refractive index characteristic as described above and exhibiting a reverse wavelength dispersion characteristic can realize a neutral hue in an oblique direction. Re (450) / Re (550) is preferably 0.8 or more and less than 1, more preferably 0.8 or more and 0.95 or less. Re (550) / Re (650) is preferably 0.8 or more and less than 1, more preferably 0.8 or more and 0.95 or less. A more excellent reflective hue can be achieved by satisfying this relationship. The Nz coefficient of the optical compensation layer is preferably from 0.3 to 0.7, more preferably from 0.4 to 0.6, still more preferably from 0.45 to 0.55, still more preferably about 0.5. If the Nz coefficient is in this range, a more excellent reflected hue can be achieved. The optical compensation layer preferably has an absolute value of the photoelastic coefficient of 2 × 10 ^-12 (m ² /N) or more, more preferably 10 × 10 ^-12 (m ² /N) to 100 × 10 ^-12 (m ² / N), further preferably 20 × 10 ^-12 (m ² /N) to 40 × 10 ^-12 (m ² /N). When the absolute value of the photoelastic coefficient is such a range, a sufficient phase difference can be ensured even if the thickness is small, and the flexibility of the organic EL panel can be maintained, and the phase difference change caused by the stress at the time of bending can be further suppressed. (As a result, the color of the organic EL panel changes). The optical compensation layer preferably has a water absorption rate of 3% or less, more preferably 2.5% or less, still more preferably 2% or less. The temporal change of the display characteristics can be suppressed by satisfying such water absorption. Further, the water absorption rate can be obtained in accordance with JIS K 7209. The optical compensation layer preferably has a barrier to moisture and gases such as oxygen. The water-transmitting rate (water vapor transmission) of the optical compensation layer at 40 ° C and 90% RH is preferably less than 1.0 × 10 ^-1 g / m ² / 24 hr. From the viewpoint of barrier properties, the lower the lower limit of the moisture permeability, the better. The gas barrier property of the optical compensation layer at 60 ° C and 90% RH is preferably 1.0 × 10 ^-7 g / m ² / 24 hr to 0.5 g / m ² / 24 hr, more preferably 1.0 × 10 ^-7 g/m ² /24 hr to 0.1 g/m ² /24 hr. When the moisture permeability and the gas barrier property are in such a range, when the polarizing plate with the optical compensation layer is bonded to the organic EL panel, the organic EL panel can be well protected from moisture and oxygen in the air. . Further, the moisture permeability and the gas barrier property can be measured in accordance with JIS K 7126-1. The optical compensation layer preferably has a glass transition temperature (Tg) of 120 ° C or higher. The lower limit of the glass transition temperature is more preferably 125 ° C or more, further preferably 130 ° C or more, and particularly preferably 135 ° C or more. On the other hand, the upper limit of the glass transition temperature is preferably 180 ° C or lower, more preferably 165 ° C or lower. There is a tendency that heat resistance is 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 optical compensation layer is typically a retardation film formed of any suitable resin that can achieve the above characteristics. Examples of the resin for forming the retardation film include polyarylate, polyimine, polyamine, polyester, polyvinyl alcohol, polyfumarate, and &lt;158665; olefin resin, polycarbonate. Resins, cellulose resins and polyurethanes. These resins may be used singly or in combination. It is preferably a polycarbonate resin or a cellulose resin. The optical compensation layer can be formed by applying a coating liquid obtained by dissolving or dispersing the above resin in any appropriate solvent to a shrinkable film to form a coating film, and shrinking the coating film. Typically, the contraction of the coating film heats the laminate of the shrinkable film and the coating film to shrink the shrinkable film, and shrinks the shrink film to shrink the coating film. The shrinkage ratio of the coating film is preferably from 0.50 to 0.99, more preferably from 0.60 to 0.98, still more preferably from 0.70 to 0.95. The heating temperature is preferably from 130 ° C to 170 ° C, more preferably from 150 ° C to 160 ° C. In one embodiment, when the coating film is shrunk, the laminated body may be extended in a direction orthogonal to the shrinking direction. In this case, the stretching ratio of the laminated body is preferably from 1.01 to 3.0 times, more preferably from 1.05 to 2.0 times, still more preferably from 1.10 to 1.50. Specific examples of the material constituting the shrinkable film include polyolefin, polyester, acrylic resin, polyamine, polycarbonate, and 158665; olefin resin, polystyrene, polyvinyl chloride, and polybutylene. Dichloroethylene, cellulose resin, polyether oxime, polyfluorene, polyimine, polyacrylic acid, acetate resin, polyarylate, polyvinyl alcohol, liquid crystal polymer. These may be used singly or in combination. The shrinkable film is preferably a stretch film formed of the materials. Alternatively, the optical compensation layer may be formed by bonding a shrinkable film to one side or both sides of a film formed of the above resin using, for example, an acrylic adhesive, and then heating the laminated body to shrink the laminated body. The thickness of the optical compensation layer is preferably from 10 μm to 150 μm. In one embodiment, the thickness is more preferably from 10 μm to 50 μm, still more preferably from 10 μm to 30 μm. In another embodiment, the thickness is more preferably 20 μm to 70 μm, still more preferably 30 μm to 60 μm. If it is such a thickness, the in-plane phase difference and the Nz coefficient required above can be obtained. A-3. 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 triacetin cellulose (TAC), a polyester resin, a polyvinyl alcohol system, a polycarbonate system, and a polyamido compound. Polyimide-based, polyether-based, polyfluorene-based, polystyrene-based, poly-fat &#158665; a olefinic, polyolefin-based, (meth)acrylic, or acetate-based transparent resin. 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 examples include a glass-based polymer such as a siloxane-based polymer. 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 containing a substituted or unsubstituted quinone imine group and a resin compound having a substituted or unsubstituted phenyl group and a nitrile group may be used. The resin may, for example, be a resin composition comprising an alternating copolymer of isobutylene and N-methylmaleimide and an acrylonitrile-styrene copolymer. The polymer film can be, for example, an extrusion molded product of the above resin composition. For the protective layer 20, surface treatment such as hard coating treatment, anti-reflection treatment, anti-stick treatment, anti-glare treatment, or the like may be performed as needed. Further, or in addition to the protective layer 20, it is also possible to perform a process of improving the visibility when viewed by polarizing sunglasses (for example, an (elliptical) circular polarizing function is given, and an ultrahigh phase difference is imparted). By performing such a process, excellent visibility can be achieved even when the display screen is viewed through a polarizing lens such as polarized sunglasses. Therefore, the polarizing plate with the optical compensation layer can also be preferably applied to an image display device which 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, still more preferably 5 μm to 150 μm. Further, in the case where the surface treatment is carried out, 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 optical compensation layer 30, the inner protective layer is preferably optically isotropic. In the present specification, "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. Regarding the material, for example, the protective layer 20 can be appropriately selected from the above materials. 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-4. Conductive layer or conductive layer with a substrate-attached conductive layer may be formed by any suitable film forming method (for example, vacuum evaporation, sputtering, CVD, ion plating, spray, etc.) It is formed by forming a metal oxide film on any suitable substrate. After the film formation, heat treatment may be performed as needed (for example, 100 ° C to 200 ° C). 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. It is also possible to dope the indium oxide 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 optical compensation layer, and the conductive layer may be used as a constituent layer of the polarizing plate with the optical compensation layer alone, or may be a laminated body with the substrate (the conductive layer with the substrate) The form is laminated to the optical compensation layer. Typically, as described above, the conductive layer and the substrate may be introduced into the polarizing plate with the optical compensation layer in the form of a conductive layer to which the substrate is attached. As a material which comprises a base material, the arbitrary 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 may be used in the form of a conductive layer of an isotropic substrate for a polarizing plate with an optical compensation layer. Examples of the material constituting the optically isotropic substrate (an isotropic substrate) include a material having a conjugated resin such as a olefin resin or an olefin resin as a main skeleton; A material having a cyclic structure such as a lactone ring or a glutinyl imide ring in the main chain of the acrylic resin. When such a material is used, when the isotropic substrate is formed, the expression of the phase difference accompanying the alignment of the molecular chains 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-5. When other layers constituting the layers of the polarizing plate with the optical compensation layer of the present invention are used, any appropriate adhesive layer or adhesive layer is used. The adhesive layer is typically formed of an acrylic adhesive. The adhesive layer is typically formed of a polyvinyl alcohol-based adhesive. Although not shown, an adhesive layer may be provided on the side of the optical compensation layer 30 of the polarizing plate 100 with the optical compensation layer. It is possible to easily attach to other optical members (for example, organic EL elements) by providing an adhesive layer in advance. Further, it is preferred that a release film is bonded to the surface of the adhesive layer before being used. B. Organic EL panel The organic EL panel of the present invention includes an organic EL element and a polarizing plate with an optical compensation layer described in the above item A, which is provided on the viewing side of the organic EL element. The polarizing plate with the optical compensation layer is laminated such that the optical compensation layer becomes the organic EL element side (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", dial gauge holder (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) Reflection Characteristics in the Oblique Direction The simulation was carried out using the characteristics of the polarizing plate with the optical compensation layer obtained in the examples and the comparative examples. The front direction (polar angle 0°) and the oblique direction (polar angle 60°) were evaluated. The simulation system uses "LCD MASTER Ver.6.084" manufactured by SYMTEC. The simulation of the reflection characteristics was performed using the expansion function of the LCD Master. More specifically, the front reflection intensity, the front reflection hue, the diagonal reflection intensity, and the oblique hue were evaluated. The diagonal reflection intensity was evaluated on a 4-point average of a polar angle of 60°, azimuth angles of 45°, 135°, 225°, and 315°. The front reflection hue system evaluates the Δu'v' (neutral) from the neutral point, and the oblique hue system evaluates the color shift Δu'v' at a polar angle of 60° and an azimuth angle of 0° to 360°. [Example 1] (i) Preparation of optical compensation layer Polymerization was carried out using a batch polymerization apparatus including a vertical reactor doubler 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 added in such a manner that it was BHEPF/ISB/DEG/DPC/magnesium acetate = 0.348/0.490/0.162/1.005/1.00×10 ^-5 in terms of molar ratio. After sufficiently replacing the inside of the reactor with nitrogen (oxygen concentration: 0.0005 to 0.001 vol%), the mixture was heated by a heating medium, and stirring was started at an internal temperature of 100 °C. After 40 minutes from the start of the temperature rise, the internal temperature was brought to 220 ° C, and the temperature was controlled to maintain the temperature. At the same time, the pressure was reduced, and after reaching 220 ° C, it was set to 13.3 kPa in 90 minutes. The phenol vapor produced by the polymerization reaction was introduced into a reflux condenser at 100 ° C, and a certain amount of the monomer component contained in the phenol vapor was returned to the reactor, and the uncondensed phenol vapor was introduced to 45 ° C. It is recovered in the condenser. Nitrogen gas was introduced into the first reactor, and after temporarily repressurizing to atmospheric pressure, the oligomerized reaction liquid in the first reactor was transferred to the second reactor. Then, the temperature rise and the 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. Nitrogen gas is introduced into the reactor at a certain power point, and the pressure is recompressed, and the reaction liquid is taken out as a strand and granulated by a rotary cutter to obtain BHEPF/ISB/DEG=34.8/49.0/16.2 [mol %] is a polycarbonate resin composed of a copolymerization. The polycarbonate resin had a specific viscosity of 0.430 dL/g and a glass transition temperature of 128 °C. The obtained polycarbonate resin (10 kg) was dissolved in dichloromethane (73 kg) to prepare a coating liquid. Then, the coating liquid was directly applied onto a shrinkable film (longitudinal uniaxially stretched polypropylene film, manufactured by Tokyo Ink Co., Ltd., trade name "Noblen"), and the coating film was dried at a drying temperature of 30 ° C for 5 minutes. It was dried at 80 ° C for 5 minutes to form a laminate of a shrinkable film/birefringent layer. With respect to the obtained laminate, a simultaneous biaxial stretching machine was used to shrink at a stretching temperature of 155 ° C at a shrinkage ratio of 0.80 in the MD direction, and it was extended 1.3 times in the TD direction, thereby being applied to the shrinkable film. A retardation film is formed. Then, the retardation film is peeled off from the shrinkable film. The thickness of the retardation film was 60.0 μm, and Re (550) = 140 nm, Nz = 0.5, and Re (450) / Re (550) = 0.89. This retardation film was set as an optical compensation layer. (ii) Production of a polarizing element A long roll of a polyvinyl alcohol (PVA) resin film (manufactured by Kuraray, product name "PE3000") having a thickness of 30 μm was 5.9 times in the longitudinal direction by a roll stretching machine. In the manner of uniaxial stretching in the longitudinal direction, swelling, dyeing, cross-linking, and washing treatment were simultaneously performed, and finally, drying treatment was carried out to prepare a polarizing element having a thickness of 12 μm. Specifically, the swelling treatment was carried out using pure water at 20 ° C and extended to 2.2 times. Then, the dyeing treatment was carried out in a 30 ° C aqueous solution having an iodine concentration adjusted iodine and potassium iodide weight ratio of 1:7 in a manner that the monomer transmittance of the obtained polarizing element was 45.0%, and extended to 1.4 times. . Further, the crosslinking treatment was carried out by a two-stage crosslinking treatment, and the first-stage crosslinking treatment was carried out in an aqueous solution in which boric acid and potassium iodide were dissolved at 40 ° C, 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 in an aqueous solution of boric acid and potassium iodide dissolved at 65 ° C and 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 35.0% by weight. Further, the washing treatment was carried out using a potassium iodide aqueous solution at 20 °C. The potassium iodide content of the aqueous solution of the washing treatment was set to 2.6% by weight. Finally, the drying treatment was dried at 70 ° C for 5 minutes to obtain a polarizing element. (iii) The polarizing plate is formed on one side of the polarizing element, and is coated with a polyvinyl alcohol-based adhesive by a roll-to-roll coating on one side of the TAC film to have a hard coat formed by hard coating (HC). The layer of the 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. (iv) Production of a polarizing plate with an optical compensation layer The polarizing plate and the optical compensation layer obtained in the above are cut into specific sizes, and the polarizing element surface of the polarizing plate and the optical compensation layer are bonded via an acrylic adhesive. A polarizing plate with an optical compensation layer having a protective layer/polarizing element/optical compensation layer was obtained. Further, the trimming of the optical compensation layer is performed such that the angle between the absorption axis of the polarizing element and the retardation axis of the optical compensation layer is 45° when the polarizing plate and the optical compensation layer are bonded. (v) Preparation of Organic EL Panel The adhesive layer was formed using an acrylic adhesive on the optical compensation layer side of the obtained polarizing plate with an optical compensation layer. Decompose the smart phone (Galaxy-S5) manufactured by Samsung Wireless and take out the organic EL panel. The polarizing film attached to the organic EL panel was peeled off, and an organic EL panel was obtained by substituting the polarizing plate with the optical compensation layer formed with the above-mentioned adhesive layer. The simulation of the reflection characteristics of the above (3) was carried out using the characteristics of the obtained polarizing plate with an optical compensation layer. The results are shown in Table 1. [Example 2] A retardation film of a cellulose acetate resin obtained in the following manner was used as an optical compensation layer, except that a composition having a protective layer/polarizing element/optical compensation layer was obtained in the same manner as in Example 1. A polarizing plate with an optical compensation layer. Further, an organic EL panel was produced in the same manner as in Example 1 except that the polarizing plate with the optical compensation layer was used. The obtained polarizing plate with an optical compensation layer and an organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1. On both sides of a cellulose acetate resin film (220 × 120 mm, thickness: 50 μm), a laminate film of the same size (PP biaxially stretched film, thickness: 60 μm) was bonded thereto using an acrylic adhesive to obtain a laminate. Thereafter, the above-mentioned laminated body is shrunk to 0.7 times at 120 ° C using a batch type simultaneous biaxial stretching machine, whereby the cellulose acetate resin film is shrunk, and at the same time, the laminated body is oriented to the above-mentioned acetate fiber. The direction in which the shrinkage direction of the resin film is orthogonal to the direction is 2.0 times, whereby a birefringent layer (retardation film) is formed. Then, the retardation film is peeled off from the shrinkable film. The retardation film has a thickness of 50 μm, and Re (550) = 140 nm, Nz = 0.5, and Re (450) / Re (550) = 0.93. This retardation film was set as an optical compensation layer. [Comparative Example 1] A commercially available cycloolefin film (manufactured by JSR Corporation, product name "ARTON") was subjected to shrinkage treatment to obtain a refractive index characteristic exhibiting nx>nz>ny, and Re(450)/Re( 550) = 1.00 and Re (550) = 140 nm retardation film. A polarizing plate with an optical compensation layer having a protective layer/polarizing element/optical compensation layer was obtained in the same manner as in Example 1 except that the retardation film was used as the optical compensation layer. Further, an organic EL panel was produced in the same manner as in Example 1 except that the polarizing plate with the optical compensation layer was used. The obtained polarizing plate with an optical compensation layer and an organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1. [Comparative Example 2] A protective layer was obtained in the same manner as in Example 1 except that a commercially available polycarbonate resin film (manufactured by Teijin Co., Ltd., trade name "PURE-ACE WR") was used as the optical compensation layer. A polarizing plate with an optical compensation layer formed of a polarizing element/optical compensation layer. Further, the film exhibited a refractive index characteristic of nx>ny=nz, and Re(450)/Re(550)=0.90 and Re(550)=140 nm. Further, an organic EL panel was produced in the same manner as in Example 1 except that the polarizing plate with the optical compensation layer was used. The obtained polarizing plate with an optical compensation layer and an organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1. [Table 1] [Evaluation] As is clear from Table 1, the polarizing plate with the optical compensation layer of the embodiment of the present invention can achieve excellent anti-reflection characteristics in the oblique direction and can make the hue in the oblique direction neutral. [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‧‧‧Optical compensation layer
100‧‧‧Polarizer with optical compensation layer

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‧‧‧Optical compensation layer

100‧‧‧Polarizer with optical compensation layer

Claims (4)

A polarizing plate with an optical compensation layer, comprising: a polarizing element and an optical compensation layer, wherein the optical compensation layer exhibits a refractive index characteristic of nx>nz>ny and satisfies a relationship of Re(450)<Re(550), A polarizing plate with an optical compensation layer is used for the organic EL panel: Here, Re(450) and Re(550) respectively represent the in-plane retardation measured by light at wavelengths of 450 nm and 550 nm at 23 °C. . A polarizing plate with an optical compensation layer as claimed in claim 1, wherein the optical compensation layer has a Re (550) of 100 nm to 180 nm and an Nz coefficient of 0.3 to 0.7. A polarizing plate with an optical compensation layer as claimed in claim 1 or 2, wherein an angle between an absorption axis of the polarizing element and a retardation axis of the optical compensation layer is 35 to 55. An organic EL panel comprising the polarizing plate with an optical compensation layer as claimed in any one of claims 1 to 3.