TWI706171B - Polarizing plate with optical compensation layer and organic EL panel using it - Google Patents

Polarizing plate with optical compensation layer and organic EL panel using it Download PDF

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TWI706171B
TWI706171B TW105127376A TW105127376A TWI706171B TW I706171 B TWI706171 B TW I706171B TW 105127376 A TW105127376 A TW 105127376A TW 105127376 A TW105127376 A TW 105127376A TW I706171 B TWI706171 B TW I706171B
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optical compensation
compensation layer
layer
polarizing plate
film
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TW105127376A
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TW201719203A (en
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飯田敏行
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日商日東電工股份有限公司
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Electroluminescent Light Sources (AREA)
  • Laminated Bodies (AREA)

Abstract

本發明提供一種可實現優異之反射色相及視角特性的附有光學補償層之偏光板。本發明之附有光學補償層之偏光板係於有機EL面板中使用。該附有光學補償層之偏光板依序具備偏光元件、第1光學補償層及第2光學補償層。第1光學補償層顯示出nz＞nx＞ny之折射率特性，Re(550)為5 nm～150 nm、Rth(550)為-240 nm～-20 nm。第2光學補償層顯示出nx＞ny≧nz之折射率特性，Re(550)為100 nm～180 nm、Nz係數為1.0～2.0，且滿足Re(450)＜Re(550)之關係。The invention provides a polarizing plate with an optical compensation layer that can realize excellent reflection hue and viewing angle characteristics. The polarizing plate with optical compensation layer of the present invention is used in organic EL panels. The polarizing plate with an optical compensation layer includes a polarizing element, a first optical compensation layer, and a second optical compensation layer in this order. The first optical compensation layer shows 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 shows a refractive index characteristic of nx>ny≧nz, Re(550) is 100 nm to 180 nm, Nz coefficient is 1.0 to 2.0, and satisfies the relationship of Re(450)<Re(550).

Description

附有光學補償層之偏光板及使用其之有機EL面板Polarizing plate with optical compensation layer and organic EL panel using it

本發明係關於一種附有光學補償層之偏光板及使用其之有機EL面板。The present invention relates to a polarizing plate with an optical compensation layer and an organic EL panel using the polarizing plate.

近年來，隨著薄型顯示器之普及，業界提出了一種搭載有機EL面板之顯示器(有機EL顯示裝置)。有機EL面板具有反射性較高之金屬層，因此容易產生外光反射或背景之映入等問題。因此，已知藉由將圓偏光板設置於視認側而防止該等問題之方法。作為通常之圓偏光板，已知有將相位差膜(代表性的是λ/4板)以其遲相軸相對於偏光元件之吸收軸形成約45°之角度之方式積層而得者。另外，為了進而改善抗反射特性，嘗試積層各種具有光學特性之相位差膜(光學補償層)。於此種具有複數個相位差膜(光學補償層)之圓偏光板中存在如下問題：若因製造上之理由等而變更相位差膜之積層順序(例如於2層之情形時反轉)，則於正面方向及斜方向之任意方向中，反射色相均會自所期望之色相偏移，及反射率(例如正面反射率)上升。 [先前技術文獻] [專利文獻] [專利文獻1]日本專利第3325560號公報In recent years, with the popularization of thin displays, the industry has proposed a display equipped with an organic EL panel (organic EL display device). The organic EL panel has a highly reflective metal layer, so it is prone to problems such as external light reflection or background reflection. Therefore, a method for preventing these problems is known by arranging the circular polarizer on the viewing side. As a general circular polarizing plate, it is known that a retardation film (typically a λ/4 plate) is laminated so that its slow axis forms an angle of about 45° with respect to the absorption axis of the polarizing element. In addition, in order to further improve the anti-reflection properties, attempts have been made to laminate various retardation films (optical compensation layers) with optical properties. In such a circularly polarizing plate having a plurality of retardation films (optical compensation layers), there is the following problem: if the stacking order of the retardation film is changed due to manufacturing reasons, etc. (for example, it is reversed in the case of two layers) Then, in any direction of the front direction and the oblique direction, the reflected hue will shift from the desired hue, and the reflectance (for example, the front reflectance) will increase. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent No. 3325560

[發明所欲解決之問題] 本發明係為了解決上述先前之課題而成者，其主要目的在於提供一種可實現優異之反射色相及視角特性的附有光學補償層之偏光板。 [解決問題之技術手段] 本發明之附有光學補償層之偏光板係於有機EL面板中使用。該附有光學補償層之偏光板依序具備偏光元件、第1光學補償層及第2光學補償層。該第1光學補償層顯示出nz＞nx＞ny之折射率特性，Re(550)為5 nm～150 nm、Rth(550)為-240 nm～-20 nm；該第2光學補償層顯示出nx＞ny≧nz之折射率特性，Re(550)為100 nm～180 nm、Nz係數為1.0～2.0，且滿足Re(450)＜Re(550)之關係。此處，Re(450)及Re(550)分別表示23℃下藉由波長為450 nm及550 nm之光測得之面內相位差，Rth(550)表示23℃下藉由波長為550 nm之光測得之厚度方向之相位差。 於一實施形態中，上述偏光元件之吸收軸方向與上述第1光學補償層之遲相軸方向實質上正交或平行，及該偏光元件之吸收軸與上述第2光學補償層之遲相軸所成之角度為35°～55°。 於一實施形態中，上述第2光學補償層係進行斜向延伸而獲得之相位差膜。 於一實施形態中，上述附有光學補償層之偏光板於上述第2光學補償層之與上述第1光學補償層相反側進而依序具備導電層及基材。 根據本發明之另一態樣，提供一種有機EL面板。該有機EL面板具備上述附有光學補償層之偏光板。 [發明之效果] 根據本發明，於具有2個光學補償層之附有光學補償層之偏光板中，將顯示出nz＞nx＞ny之折射率特性之光學補償層配置於偏光元件側，將顯示出nx＞ny≧nz之折射率特性、且顯示出逆頻散之波長依存性之光學補償層配置於遠離偏光元件之側，進而使該2個光學補償層之面內相位差及厚度方向相位差最佳化，藉此可獲得能夠實現優異之反射色相及視角特性之附有光學補償層之偏光板。[Problems to be Solved by the Invention] The present invention was made to solve the aforementioned problems, and its main purpose is to provide a polarizing plate with an optical compensation layer that can realize excellent reflection hue and viewing angle characteristics. [Technical Means to Solve the Problem] The polarizing plate with optical compensation layer of the present invention is used in organic EL panels. The polarizing plate with an optical compensation layer includes a polarizing element, a first optical compensation layer, and a second optical compensation layer in this order. The first optical compensation layer shows the refractive index characteristics of nz>nx>ny, Re(550) is 5 nm～150 nm, Rth(550) is -240 nm～-20 nm; the second optical compensation layer shows The refractive index characteristic of nx>ny≧nz, Re(550) is 100 nm～180 nm, Nz coefficient is 1.0～2.0, and satisfies the relationship of Re(450)＜Re(550). Here, Re(450) and Re(550) represent the in-plane phase difference measured by light with wavelengths of 450 nm and 550 nm at 23°C, respectively, and Rth(550) represents the wavelength at 23°C with a wavelength of 550 nm The phase difference in the thickness direction measured by the light. In one embodiment, the direction of the absorption axis of the polarizing element is substantially orthogonal or parallel to the direction of the slow axis of the first optical compensation layer, and the absorption axis of the polarizing element is the same as the slow axis of the second optical compensation layer. The angle formed is 35°～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 further provided with a conductive layer and a base material on the opposite side of the second optical compensation layer from the first optical compensation layer. According to another aspect of the present invention, an organic EL panel is provided. The organic EL panel includes the above-mentioned polarizing plate with an optical compensation layer. [Effects of the Invention] According to the present invention, in a polarizing plate with an optical compensation layer having two optical compensation layers, an optical compensation layer showing a refractive index characteristic of nz>nx>ny is arranged on the side of the polarizing element, and The optical compensation layer showing the refractive index characteristics of nx>ny≧nz and showing the wavelength dependence of inverse dispersion is arranged on the side away from the polarizing element, and the in-plane phase difference and thickness direction of the two optical compensation layers By optimizing the phase difference, a polarizing plate with an optical compensation layer can be obtained that can achieve excellent reflection hue and viewing angle characteristics.

以下，對本發明之較佳之實施形態加以說明，但本發明並不限定於該等實施形態。 (用語及記號之定義) 本說明書中之用語及記號之定義如下所示。 (1)折射率(nx、ny、nz) 「nx」係面內之折射率成為最大之方向(即，遲相軸方向)之折射率，「ny」係於面內與遲相軸正交之方向(即，進相軸方向)之折射率，「nz」係厚度方向之折射率。 (2)面內相位差(Re) 「Re(λ)」係23℃下藉由波長為λ nm之光測得之面內相位差。Re(λ)係將層(膜)之厚度設為d(nm)時，根據式：Re＝(nx－ny)×d而求出。例如，「Re(550)」係23℃下藉由波長為550 nm之光測得之面內相位差。 (3)厚度方向之相位差(Rth) 「Rth(λ)」係23℃下藉由波長為λ nm之光測得之厚度方向之相位差。Rth(λ)係將層(膜)之厚度設為d(nm)時，根據式：Rth＝(nx－nz)×d而求出。例如，「Rth(550)」係23℃下藉由波長為550 nm之光測得之厚度方向之相位差。 (4)Nz係數 Nz係數係根據Nz＝Rth/Re而求出。 (5)實質上正交或平行 「實質上正交」及「大致正交」之表現包含2個方向所成之角度為90°±10°之情形，較佳為90°±7°，更佳為90°±5°。「實質上平行」及「大致平行」之表現包括2個方向所成之角度為0°±10°之情形，較佳為0°±7°，更佳為0°±5°。進而，於本說明書中僅稱為「正交」或「平行」時，可包含實質上正交或實質上平行之狀態。 A.附有光學補償層之偏光板之整體構成 圖1係本發明之一實施形態之附有光學補償層之偏光板之概略剖視圖。本實施形態之附有光學補償層之偏光板100依序具備偏光元件10、第1光學補償層30及第2光學補償層40。實用性而言，可如圖示例所示般於偏光元件10之與第1光學補償層30相反側設置保護層20。較佳為附有光學補償層之偏光板100於偏光元件10與第1光學補償層30之間不含光學各向異性層。光學各向異性層係指例如面內相位差Re(550)超過10 nm、及/或厚度方向之相位差Rth(550)未達-10 nm或超過10 nm之層。作為光學各向異性層，例如可列舉液晶層、相位差膜、保護膜。於附有光學補償層之偏光板不含光學各向異性層之情形時，於一實施形態中，第1光學補償層30可作為偏光元件之保護層而發揮功能。於另一實施形態中，亦可於偏光元件10與第1光學補償層30之間(即，偏光元件10之與保護層20相反側)設置具有光學各向同性之保護層(以下亦可稱為內側保護層；未圖示)。進而，亦可視需要於第2光學補償層40之與第1光學補償層30相反側(即，第2光學補償層40之外側)依序設置導電層及基材(均未圖示)。基材密接積層於導電層。於本說明書中，所謂「密接積層」係指2個層並未介置接著層(例如接著劑層、黏著劑層)而直接且固著地積層。導電層及基材代表性的是可以基材與導電層之積層體之形式導入至附有光學補償層之偏光板100。藉由進而設置導電層及基材，附有光學補償層之偏光板100可較佳地用於內觸控面板型輸入顯示裝置。 第1光學補償層30之折射率特性顯示出nz＞nx＞ny之關係，具有遲相軸。第1光學補償層30之遲相軸與偏光元件10之吸收軸實質上正交或平行。第2光學補償層40之折射率特性顯示出nx＞ny≧nz之關係，具有遲相軸。第2光學補償層40之遲相軸與偏光元件10之吸收軸所成之角度為35°～55°，較佳為38°～52°，更佳為42°～48°，進而更佳為約45°。若上述角度為此種範圍，則可實現優異之抗反射功能。第2光學補償層40代表性的是可由進行斜向延伸而獲得之相位差膜構成。如上所述，將顯示出nz＞nx＞ny之折射率特性之第1光學補償層配置於偏光元件側，將顯示出nx＞ny≧nz之折射率特性、且顯示出逆頻散之波長依存性之第2光學補償層配置於遠離偏光元件之側，藉此可抑制因第1光學補償層之面內相位差之影響所造成之反射率之上升，可使反射色相之變化變小。進而，此種效果如後述般藉由使第1光學補償層之面內相位差最佳化而變得顯著。 附有光學補償層之偏光板可為單片狀，亦可為長條狀。 以下，對構成附有光學補償層之偏光板之各層及光學膜加以詳細說明。 A-1.偏光元件 作為偏光元件10，可採用任意適宜之偏光元件。例如，形成偏光元件之樹脂膜可為單層之樹脂膜，亦可為兩層以上之積層體。 作為由單層樹脂膜構成之偏光元件之具體例，可列舉：對聚乙烯醇(PVA)系膜、部分縮甲醛化PVA系膜、乙烯-乙酸乙烯酯共聚物系部分皂化膜等親水性高分子膜實施利用碘或二色性染料等二色性物質之染色處理及延伸處理而成者；PVA之脫水處理物或聚氯乙烯之脫氯化氫處理物等聚烯系配向膜等。就光學特性優異之方面而言，較佳為使用利用碘對PVA系膜進行染色並進行單軸延伸而獲得之偏光元件。 上述利用碘之染色例如係藉由將PVA系膜浸漬於碘水溶液中而進行。上述單軸延伸之延伸倍率較佳為3～7倍。延伸可於染色處理後進行，亦可一面染色一面進行。又，亦可於延伸後進行染色。視需要對PVA系膜實施膨潤處理、交聯處理、清洗處理、乾燥處理等。例如，藉由在染色前將PVA系膜浸漬於水中進行水洗，不僅可清洗PVA系膜表面之污垢或抗結塊劑，而且亦可使PVA系膜膨潤而防止染色不均等。 作為使用積層體而獲得之偏光元件之具體例，可列舉：使用樹脂基材與積層於該樹脂基材上之PVA系樹脂層(PVA系樹脂膜)之積層體、或樹脂基材與塗佈形成於該樹脂基材上之PVA系樹脂層之積層體而獲得之偏光元件。使用樹脂基材與塗佈形成於該樹脂基材上之PVA系樹脂層之積層體所獲得之偏光元件例如可藉由如下步驟製作：將PVA系樹脂溶液塗佈於樹脂基材上，使其乾燥而於樹脂基材上形成PVA系樹脂層，獲得樹脂基材與PVA系樹脂層之積層體；對該積層體進行延伸及染色而將PVA系樹脂層製成偏光元件。於本實施形態中，代表性而言，延伸包含使積層體浸漬於硼酸水溶液中進行延伸。進而，延伸可視需要進而包括於硼酸水溶液中之延伸之前，於高溫(例如95℃以上)下對積層體進行空中延伸。所獲得之樹脂基材/偏光元件之積層體可直接使用(即，可將樹脂基材作為偏光元件之保護層)，亦可將樹脂基材自樹脂基材/偏光元件之積層體剝離，於該剝離面積層與目的相應之任意之適宜之保護層而使用。此種偏光元件之製造方法之詳細情況例如記載於日本專利特開2012-73580號公報。對於該公報，將其全部記載作為參考而引用至本說明書中。 偏光元件之厚度較佳為25 μm以下，更佳為1 μm～12 μm，進而更佳為3 μm～12 μm，特佳為3 μm～8 μm。若偏光元件之厚度為此種範圍，則可良好地抑制加熱時之捲曲，及獲得良好之加熱時之外觀耐久性。 偏光元件較佳為於波長為380 nm～780 nm之任一意波長下顯示出吸收二色性。偏光元件之單體透過率如上所述為43.0%～46.0%，較佳為44.5%～46.0%。偏光元件之偏光度較佳為97.0%以上，更佳為99.0%以上，進而更佳為99.9%以上。 A-2.第1光學補償層 如上所述，第1光學補償層30其折射率特性顯示出nz＞nx＞ny之關係。藉由設置具有此種光學特性之第1光學補償層，可顯著改善自斜方向觀察時之反射色相，結果可獲得具有非常優異之視角特性的附有光學補償層之偏光板。此種第1光學補償層通常設置於遠離偏光元件之側(例如附有光學補償層之偏光板之最外側)，但根據本發明之實施形態，設置於偏光元件側。藉由採用此種構成，進而如後述般使該光學補償層之面內相位差最佳化，可避免因第1光學補償層之面內各向異性所造成之遲相軸之影響，抑制反射率上升、且使反射色相之變化變小。 第1光學補償層之面內相位差Re(550)為5 nm～150 nm，較佳為10 nm～130 nm，更佳為20 nm～130 nm。若面內相位差為此種範圍，則可抑制反射率上升，可同時實現優異之視角特性與抗反射特性。 第1光學補償層之厚度方向之相位差Rth(550)為-240 nm～-20 nm，較佳為-200 nm～-20 nm，更佳為-150 nm～-20 nm。若厚度方向之相位差為此種範圍，則可與面內相位差之最佳化之情形同樣地抑制反射率之上升，且可同時實現優異之視角特性與抗反射特性。 第1光學補償層可由任意適宜之材料而形成。較佳為第1光學補償層能夠包含日本專利特開2012-32784號公報中所記載之由富馬酸二酯系樹脂所形成之相位差膜而成。第1光學補償層之厚度較佳為5 μm～80 μm，更佳為10 μm～50 μm。 A-3.第2光學補償層 如上所述，第2光學補償層40其折射率特性顯示出nx＞ny≧nz之關係。第2光學補償層之面內相位差Re(550)為100 nm～180 nm，較佳為110 nm～170 nm，更佳為120 nm～160 nm。若第2光學補償層之面內相位差為此種範圍，則可將第2光學補償層之遲相軸方向設定為相對於偏光元件之吸收軸方向成如上述般之35°～55°(特別是約45°)之角度，藉此可實現優異之抗反射功能。 第2光學補償層顯示出所謂逆頻散之波長依存性。具體而言，該面內相位差滿足Re(450)＜Re(550)之關係。藉由滿足此種關係，可達成優異之反射色相。Re(450)/Re(550)較佳為0.8以上、未達1，更佳為0.8以上、0.95以下。 第2光學補償層之Nz係數為1.0～2.0，較佳為1.0～1.5，更佳為1.0～1.3。藉由滿足此種關係，可達成更優異之反射色相。 關於第2光學補償層，其吸水率較佳為3%以下，更佳為2.5%以下，進而更佳為2%以下。藉由滿足此種吸水率，可抑制顯示特性之經時變化。再者，吸水率可依據JIS K 7209而求出。 第2光學補償層代表性的是藉由任意適宜之樹脂而形成之相位差膜。作為形成該相位差膜之樹脂，較佳為使用聚碳酸酯樹脂。 作為上述聚碳酸酯樹脂，只要可獲得本發明之效果，則可使用任意適宜之聚碳酸酯樹脂。較佳為聚碳酸酯樹脂包含：源自茀系二羥基化合物之結構單元、源自異山梨酯系二羥基化合物之結構單元、及源自選自由脂環式二醇、脂環式二甲醇、二、三或聚乙二醇、以及烷二醇或螺二醇所組成之群中之至少1種二羥基化合物之結構單元。較佳為聚碳酸酯樹脂包含：源自茀系二羥基化合物之結構單元、源自異山梨酯系二羥基化合物之結構單元、及源自脂環式二甲醇之結構單元及/或源自二、三或聚乙二醇之結構單元；進而更佳為包含：源自茀系二羥基化合物之結構單元、源自異山梨酯系二羥基化合物之結構單元、及源自二、三或聚乙二醇之結構單元。聚碳酸酯樹脂亦可視需要包含源自其他二羥基化合物之結構單元。再者，於本發明中可適宜使用之聚碳酸酯樹脂之詳細內容例如記載於日本專利特開2014-10291號公報、日本專利特開2014-26266號公報，該記載作為參考而引用至本說明書中。 上述聚碳酸酯樹脂之玻璃轉移溫度較佳為110℃以上、180℃以下，更佳為120℃以上、165℃以下。若玻璃轉移溫度過低，則存在耐熱性變差之傾向，且存在於膜成形後產生尺寸變化之可能性，又，存在所獲得之有機EL面板之圖像品質下降之情形。若玻璃轉移溫度過高，則存在膜成形時之成形穩定性變差之情形，且存在有損膜之透明性之情形。再者，玻璃轉移溫度係依據JIS K 7121(1987)而求出。 上述聚碳酸酯樹脂之分子量可由比濃黏度表示。比濃黏度係使用二氯甲烷作為溶劑，將聚碳酸酯濃度精確地製備為0.6 g/dL，於溫度20.0℃±0.1℃下使用烏氏黏度管進行測定。比濃黏度之下限通常較佳為0.30 dL/g，更佳為0.35 dL/g以上。比濃黏度之上限通常較佳為1.20 dL/g，更佳為1.00 dL/g，進而更佳為0.80 dL/g。若比濃黏度小於上述下限值，則存在產生成形品之機械強度變小之問題之情形。另一方面，若比濃黏度大於上述上限值，則存在產生成形時之流動性降低，生產性或成形性降低之問題之情形。 相位差膜代表而言係藉由使樹脂膜於至少一方向上延伸而製作。 作為上述樹脂膜之形成方法，可採用任意適宜之方法。例如可列舉熔融擠出法(例如T模成形法)、澆鑄塗佈法(例如流延法)、壓延成形法、熱壓法、共擠出法、共熔融法、多層擠出、吹脹成形法等。較佳為使用T模成形法、流延法、及吹脹成形法。 樹脂膜(未延伸膜)之厚度可根據所期望之光學特性、後述之延伸條件等而設定為任意適宜之值。較佳為50 μm～300 μm。 上述延伸可採用任意適宜之延伸方法、延伸條件(例如延伸溫度、延伸倍率、延伸方向)。具體而言，可單獨使用亦可同時或逐次使用自由端延伸、固定端延伸、自由端收縮、固定端收縮等各種延伸方法。關於延伸方向，亦可於水平方向、垂直方向、厚度方向、對角方向等各種方向或維度地進行。關於延伸之溫度，相對於樹脂膜之玻璃轉移溫度(Tg)，較佳為Tg－30℃～Tg＋60℃，更佳為Tg－10℃～Tg＋50℃。 藉由適當地選擇上述延伸方法、延伸條件，可獲得具有上述所期望之光學特性(例如折射率特性、面內相位差、Nz係數)之相位差膜。 於一實施形態中，相位差膜係藉由將長條狀之樹脂膜於相對於長度方向為角度θ之方向上連續地斜向延伸而製作。藉由採用斜向延伸，可獲得具有相對於膜之長度方向為角度θ之配向角(於角度θ之方向上之遲相軸)之長條狀之延伸膜，例如於與偏光元件之積層時實現捲對捲，可將製造步驟簡化。偏光元件之吸收軸因其製造方法而表現於長條狀膜之長度方向或寬度方向，因此上述角度θ可為偏光元件之吸收軸與第2光學補償層之遲相軸所成之角度。 作為斜向延伸所使用之延伸機，例如可列舉能夠於橫及/或縱方向上附加左右不同之速度之進給力或拉伸力或捲取力之拉幅式延伸機。拉幅式延伸機有橫向單軸延伸機、同時雙軸延伸機等，但只要能夠將長條狀之樹脂膜連續地斜向延伸，則可使用任意適宜之延伸機。 相位差膜(延伸膜、即第2光學補償層)之厚度較佳為20 μm～100 μm，更佳為20 μm～80 μm，進而更佳為20 μm～65 μm。若為此種厚度，則可獲得上述所期望之面內相位差及厚度方向相位差。 A-4.積層體 上述第1光學補償層及第2光學補償層之積層體之面內相位差Re(550)為120 nm～160 nm，較佳為130 nm～150 nm。該積層體之厚度方向之相位差Rth(550)為-40 nm～80 nm，較佳為-20 nm～50 nm。藉由如此設定積層體之光學特性，可顯著改善自斜方向觀察時之反射色相，結果可獲得具有非常優異之視角特性之附有光學補償層之偏光板。 A-5.保護層 保護層20係由可用作偏光元件之保護層的任意適宜之膜而形成。作為成為該膜之主成分的材料之具體例，可列舉：三乙醯纖維素(TAC)等纖維素系樹脂，或聚酯系、聚乙烯醇系、聚碳酸酯系、聚醯胺系、聚醯亞胺系、聚醚碸系、聚碸系、聚苯乙烯系、聚降

Figure 105127376-A0304-12-0011-5
烯系、聚烯烴系、(甲基)丙烯酸系、乙酸酯系等透明樹脂等。又，亦可列舉：(甲基)丙烯酸系、胺基甲酸酯系、(甲基)丙烯酸胺基甲酸酯系、環氧系、聚矽氧系等熱硬化型樹脂或紫外線硬化型樹脂等。除此以外，例如亦可列舉矽氧烷系聚合物等玻璃質系聚合物。又，亦可使用日本專利特開2001-343529號公報(WO01/37007)中所記載之聚合物膜。作為該膜之材料，例如可使用含有於側鏈具有經取代或未經取代之醯亞胺基的熱塑性樹脂、以及於側鏈具有經取代或未經取代之苯基及腈基之熱塑性樹脂的樹脂組合物，例如可列舉：具有包含異丁烯與N-甲基馬來醯亞胺之交替共聚物、及丙烯腈-苯乙烯共聚物之樹脂組合物。此種聚合物膜例如可為上述樹脂組合物之擠出成形物。 亦可視需要對保護層20實施硬塗處理、抗反射處理、抗沾黏處理、防眩處理等表面處理。進而/或者亦可視需要對保護層20實施改善隔著偏光太陽眼鏡視認之情形時之視認性的處理(代表性的是賦予(橢)圓偏光功能、賦予超高相位差)。藉由實施此種處理，即使於隔著偏光太陽眼鏡等偏光鏡視認顯示畫面之情形時，亦可實現優異之視認性。因此，附有光學補償層之偏光板亦可適宜地用於能夠在室外使用之圖像顯示裝置。 保護層20之厚度代表性的是5 mm以下，較佳為1 mm以下，更佳為1 μm～500 μm，進而更佳為5 μm～150 μm。再者，於實施表面處理之情形時，保護層之厚度係包含表面處理層之厚度在內的厚度。 於偏光元件10與第1光學補償層30之間設置內側保護層之情形時，該內側保護層較佳為如上所述為光學各向同性。於本說明書中，所謂「光學各向同性」係指面內相位差Re(550)為0 nm～10 nm，厚度方向之相位差Rth(550)為-10 nm～+10 nm。內側保護層只要是光學各向同性，則可由任意適宜之材料構成。該材料例如可自關於保護層20所述之材料中適當選擇。 內側保護層之厚度較佳為5 μm～200 μm，更佳為10 μm～100 μm，進而更佳為15 μm～95 μm。 A-6.導電層或附有基材之導電層 導電層可藉由任意適宜之成膜方法(例如真空蒸鍍法、濺鍍法、CVD法、離子鍍覆法、噴霧法等)，於任意適宜之基材上使金屬氧化物膜成膜而形成。於成膜後，亦可視需要進行加熱處理(例如100℃～200℃)。藉由進行加熱處理，可使非晶質膜結晶化。作為金屬氧化物，例如可列舉：氧化銦、氧化錫、氧化鋅、銦-錫複合氧化物、錫-銻複合氧化物、鋅-鋁複合氧化物、銦-鋅複合氧化物等。銦氧化物中亦可摻雜有2價金屬離子或4價金屬離子。較佳為銦系複合氧化物，更佳為銦-錫複合氧化物(ITO)。銦系複合氧化物具有如下特徵：於可見光區域(380 nm～780 nm)具有較高之透過率(例如80%以上)，且每單位面積之表面電阻值較低。 於導電層包含金屬氧化物之情形時，該導電層之厚度較佳為50 nm以下，更佳為35 nm以下。導電層之厚度之下限較佳為10 nm。 導電層之表面電阻值較佳為300 Ω/□以下，更佳為150 Ω/□以下，進而更佳為100 Ω/□以下。 導電層可自上述基材轉印至第2光學補償層而僅將導電層設為附有光學補償層之偏光板之構成層，亦可以與基材之積層體(附有基材之導電層)之形式積層於第2光學補償層。代表性而言，如上所述，導電層及基材可作為附有基材之導電層被導入至附有光學補償層之偏光板。 作為構成基材之材料，可列舉任意適宜之樹脂。較佳為透明性優異之樹脂。作為具體例，可列舉：環狀烯烴系樹脂、聚碳酸酯系樹脂、纖維素系樹脂、聚酯系樹脂、丙烯酸系樹脂。 較佳為上述基材為光學各向同性，因此導電層可作為附有各向同性基材之導電層而用於附有光學補償層之偏光板。作為構成光學各向同性之基材(各向同性基材)之材料，例如可列舉以降
Figure 105127376-A0304-12-0011-5
烯系樹脂或烯烴系樹脂等不具有共軛系之樹脂為主骨架的材料、於丙烯酸系樹脂之主鏈中具有內酯環或戊二醯亞胺環等環狀結構之材料等。若使用此種材料，則於形成各向同性基材時，可將伴隨分子鏈之配向所表現之相位差抑制為較小。 基材之厚度較佳為10 μm～200 μm，更佳為20 μm～60 μm。 A-7.其他 於構成本發明之附有光學補償層之偏光板之各層之積層中可使用任意適宜之黏著劑層或接著劑層。黏著劑層代表性的是由丙烯酸系黏著劑而形成。接著劑層代表性的是由聚乙烯醇系接著劑而形成。 雖未圖示，但於附有光學補償層之偏光板100之第2光學補償層40側亦可設置有黏著劑層。藉由預先設置黏著劑層，可容易地貼附於其他光學構件(例如有機EL單元)上。再者，較佳為在供使用之前，於該黏著劑層之表面貼合有剝離膜。 B.製造方法 作為上述附有光學補償層之偏光板之製造方法，可採用任意適宜之方法。於一實施形態中，附有光學補償層之偏光板可藉由包含如下步驟之方法而製造：將構成保護層之長條狀之樹脂膜、長條狀且於長度方向具有吸收軸之偏光元件、第1光學補償層及第2光學補償層之長條狀之積層體一面分別於長度方向上搬送，一面以各者之長度方向對齊之方式進行積層之步驟。保護層、偏光元件及積層體可同時積層，亦可首先將保護層與偏光元件積層，亦可首先將偏光元件與積層體積層。於另一實施形態中，附有光學補償層之偏光板可藉由包含如下步驟之方法而製造：將構成保護層之長條狀之樹脂膜、與長條狀且於長度方向具有吸收軸之偏光元件積層而獲得積層膜之步驟；一面搬送該積層膜，一面於偏光元件表面塗佈形成第1光學補償層之步驟；及將形成有第1光學補償層之積層膜、與構成第2光學補償層之長條狀之相位差膜積層之步驟。此處，偏光元件10之吸收軸與第2光學補償層40之遲相軸所成之角度如上所述為35°～55°，較佳為38°～52°，更佳為42°～48°，進而更佳為約45°。 於本實施形態中，構成第2光學補償層之長條狀之相位差膜於相對於其長度方向為角度θ之方向上具有遲相軸。角度θ可為如上所述之偏光元件之吸收軸與第1光學補償層之遲相軸所成之角度。此種相位差膜可藉由斜向延伸而獲得。根據此種構成，可如上所述地於附有光學補償層之偏光板之製造中實現捲對捲，從而明顯縮短製造步驟。 C.有機EL面板 本發明之有機EL面板具備：有機EL單元、與位於該有機EL單元之視認側的上述A項中記載之附有光學補償層之偏光板。附有光學補償層之偏光板係以第2光學補償層成為有機EL單元側之方式(以偏光元件成為視認側之方式)進行積層。 [實施例] 以下，藉由實施例而對本發明加以具體說明，但本發明不受該等實施例所限定。再者，各特性之測定方法如下所示。 (1)厚度 使用針盤量規(PEACOCK公司製造，產品名為「DG-205」，針盤量規試驗台(產品名為「pds-2」))進行測定。 (2)相位差 自各光學補償層切出50 mm×50 mm之樣品而製成測定樣品，使用Axometrics公司製造之Axoscan進行測定。測定波長為450 nm、550 nm，測定溫度為23℃。 又，使用Atago公司製造之阿貝折射計測定平均折射率，根據所獲得之相位差值算出折射率nx、ny、nz。 (3)吸水率 依據JIS K 7209中所記載之「塑膠之吸水率及沸騰吸水率試驗方法」進行測定。試片之大小為邊長50 mm之正方形，於水溫為25℃之水中將試片浸水24小時後，測定浸水前後之重量變化，藉此求出。單位為%。 (4)反射色相及視角特性 使黑色圖像顯示於所獲得之有機EL面板，使用Auoronic-MERCHERS公司製造之視角測定評價裝置錐光鏡(conoscope)測定反射色相。「視角特性」係表示CIE表色系統之xy色度圖中之正面方向之反射色相與斜方向之反射色相(極角45°時之最大值或最小值)之2點間距離Δxy。若該Δxy小於0.15，則將視角特性評價為良好。 (5)正面反射率 使黑色圖像顯示於所獲得之有機EL面板，使用柯尼卡美能達公司製造之分光測色計CM-2600d測定正面反射率。若反射率小於20(%)，則評價為反射特性良好。 [實施例1] (第1光學補償層之製作) 於具備攪拌機、冷凝管、氮氣導入管及溫度計之1升反應器中加入作為分散劑之羥丙基甲基纖維素(信越化學公司製造，商品名Metolose 60SH-50)2.3 g、蒸餾水600 g、富馬酸二異丙酯358 g、富馬酸二乙酯42 g(相對於富馬酸二異丙酯100重量份為11.7重量份)、甲基異丁基酮10 g(相對於富馬酸二異丙酯與富馬酸二乙酯之合計100重量份為2.4重量份)及作為聚合起始劑之過氧化特戊酸第三丁酯3.1 g，進行1小時之通入氮氣後，一面以400 rpm進行攪拌一面於50℃下保持24小時，藉此進行懸浮自由基聚合。於聚合反應結束後，自反應器中回收內容物，過濾分離聚合物，利用蒸餾水2000 g清洗5次後，利用甲醇2000 g清洗5次，於80℃下進行6小時真空乾燥，藉此獲得富馬酸二酯系聚合物310 g。 使所獲得之富馬酸二酯溶解於MIBK中，將該塗佈液塗佈於PET上，於80℃下乾燥5分鐘，進而於130℃下乾燥5分鐘，藉此製作相位差層(nz＞nx＝ny)。進而藉由進行延伸處理而形成具有nz＞nx＞ny之折射率特性的相位差層，將該相位差層作為第1光學補償層。 (聚碳酸酯樹脂膜之製作) 使用包含2台具備攪拌翼及控制為100℃之回流冷凝器的縱型反應器之分批聚合裝置，進行聚合。將9,9-[4-(2-羥基乙氧基)苯基]茀(BHEPF)、異山梨酯(ISB)、二乙二醇(DEG)、碳酸二苯酯(DPC)、及乙酸鎂四水合物以莫耳比率成為BHEPF/ISB/DEG/DPC/乙酸鎂＝0.348/0.490/0.162/1.005/1.00×10-5 之方式裝入。對反應器內進行充分氮氣置換後(氧氣濃度0.0005～0.001 vol%)，藉由熱媒進行加溫，於內溫成為100℃之時間點開始攪拌。於升溫開始40分鐘後使內溫達到220℃，以保持該溫度之方式進行控制，同時開始減壓，於達到220℃後以90分鐘設為13.3 kPa。將隨著聚合反應而副生成之苯酚蒸氣導入至100℃之回流冷凝器中，使苯酚蒸氣中含有若干量之單體成分返回至反應器中，將並未冷凝之苯酚蒸氣導入至45℃之冷凝器而進行回收。 於第1反應器中導入氮氣而使其暫時恢復至大氣壓後，將第1反應器內之經低聚物化之反應液移至第2反應器中。其次，開始第2反應器內之升溫及減壓，以50分鐘設為內溫240℃、壓力0.2 kPa。其後，進行聚合直至成為特定之攪拌動力。於到達特定動力之時間點向反應器中導入氮氣而恢復壓力，以股線之形態抽出反應液，藉由旋轉式切割機進行顆粒化，獲得BHEPF/ISB/DEG＝34.8/49.0/16.2[mol%]之共聚組成之聚碳酸酯樹脂。該聚碳酸酯樹脂之比濃黏度為0.430 dL/g、玻璃轉移溫度為128℃。 (第2光學補償層之製作) 將所獲得之聚碳酸酯樹脂於80℃下進行5小時真空乾燥後，使用具備單軸擠出機(五十鈴化工機公司製造、螺桿直徑為25 mm、料缸設定溫度：220℃)、T型模頭(寬900 mm、設定溫度：220℃)、冷卻輥(設定溫度：125℃)及捲取機之膜製膜裝置，製作厚度為130 μm之聚碳酸酯樹脂膜。所獲得之聚碳酸酯樹脂膜之吸水率為1.2%。 藉由依據日本專利特開2014-194483號公報之實施例1之方法，對以上述方式獲得之聚碳酸酯樹脂膜進行斜向延伸，獲得相位差膜。 相位差膜之具體的製作順序如下所述：將聚碳酸酯樹脂膜(厚130 μm、寬765 mm)於延伸裝置之預熱區預熱至142℃。於預熱區中，左右夾具之夾具間距為125 mm。其次，於膜進入第1斜向延伸區C1之同時，開始增大右側夾具之夾具間距，於第1斜向延伸區C1中自125 mm增大至177.5 mm。夾具間距變化率為1.42。於第1斜向延伸區C1中，對左側夾具之夾具間距開始減少夾具間距，於第1斜向延伸區C1中自125 mm減少至90 mm。夾具間距變化率為0.72。進而，於膜進入第2斜向延伸區C2之同時，開始增大左側夾具之夾具間距，於第2斜向延伸區C2中自90 mm增大至177.5 mm。另一方面，右側夾具之夾具間距於第2斜向延伸區C2中仍維持為177.5 mm。又，與上述斜向延伸同時亦對寬度方向進行1.9倍之延伸。再者，上述斜向延伸係於135℃下進行。其次，於收縮區中進行MD收縮處理。具體而言，使左側夾具及右側夾具之夾具間距均自177.5 mm減少至165 mm。MD收縮處理中之收縮率為7.0%。 以上述方式獲得相位差膜(厚度40 μm)。所獲得之相位差膜之Re(550)為147 nm、Rth(550)為167 nm(nx：1.5977、ny：1.59404、nz：1.5935)，顯示出nx＞ny＝nz之折射率特性。又，所獲得之相位差膜之Re(450)/Re(550)為0.89。相位差膜之遲相軸方向相對於長度方向為45°。 (積層體之製作) 於上述相位差膜(第2光學補償層)上，經由丙烯酸系黏著劑，藉由捲對捲貼合上述相位差層(第1光學補償層)，然後將上述基材膜去除，獲得於相位差膜(第2光學補償層)上轉印有相位差層(第1光學補償層)之積層體。 (偏光元件之製作) 對於厚度為30 μm之聚乙烯醇(PVA)系樹脂膜(Kuraray公司製造，產品名「PE3000」)之長條捲筒，藉由輥延伸機以長度方向上成為5.9倍之方式一面於長度方向上進行單軸延伸，一面同時實施膨潤、染色、交聯、清洗處理，最後實施乾燥處理，藉此製作厚度為12 μm之偏光元件。 具體而言，膨潤處理係一面藉由20℃之純水進行處理一面延伸至2.2倍。其次，染色處理係以所獲得之偏光元件之單體透過率成為45.0%之方式，一面於碘濃度經調整之碘與碘化鉀之重量比為1：7之30℃之水溶液中進行處理，一面延伸至1.4倍。進而，交聯處理採用2階段之交聯處理，第1階段之交聯處理係一面於40℃之溶解有硼酸與碘化鉀之水溶液中進行處理，一面延伸至1.2倍。第1階段之交聯處理之水溶液之硼酸含量設為5.0重量%，碘化鉀含量設為3.0重量%。第2階段之交聯處理係一面於65℃之溶解有硼酸與碘化鉀之水溶液中進行處理，一面延伸至1.6倍。第2階段之交聯處理之水溶液之硼酸含量設為4.3重量%，碘化鉀含量設為5.0重量%。又，清洗處理係藉由20℃之碘化鉀水溶液進行處理。清洗處理之水溶液之碘化鉀含量設為2.6重量%。最後，乾燥處理係於70℃下乾燥5分鐘而獲得偏光元件。 (偏光板之製作) 於上述偏光元件之單側，經由聚乙烯醇系接著劑，藉由捲對捲而貼合於TAC膜之單面具有藉由硬塗處理而形成之硬塗(HC)層之HC-TAC膜(厚度：32 μm，與保護層對應)，獲得具有保護層/偏光元件之構成之長條狀之偏光板。 (附有光學補償層之偏光板之製作) 經由丙烯酸系黏著劑，將上述所獲得之偏光板之偏光元件面與上述所獲得之第1光學補償層/第2光學補償層之積層體之第1光學補償層面藉由捲對捲而貼合，獲得具有保護層/偏光元件/第1光學補償層/第2光學補償層之構成的長條狀之附有光學補償層之偏光板。 (有機EL面板之製作) 於所獲得之附有光學補償層之偏光板之第2光學補償層側，藉由丙烯酸系黏著劑形成黏著劑層，切出尺寸為50 mm×50 mm。 將三星無線公司製造之智慧型手機(Galaxy-S5)分解並取出有機EL面板。剝去該有機EL面板上所貼附之偏光膜，取而代之，貼合上述所切出之附有光學補償層之偏光板而獲得有機EL面板。 藉由上述(4)之順序測定所獲得之有機EL面板之反射特性。結果確認於正面方向及斜方向之任意方向均實現中性之反射色相。又，將視角特性及正面反射率之結果表示於表1中。 [表1]
Figure 105127376-A0304-0001
 [實施例2～6及比較例1～7] 藉由表1中所示之構成製作附有光學補償層之偏光板及有機EL面板。再者，比較例1～3分別為相對於實施例3～5實質上使光學補償層及第2光學補償層之積層順序反轉者。將所獲得之附有光學補償層之偏光板及有機EL面板供至與實施例1同樣之評價中。如表1所示，實施例2～6之有機EL面板之視角特性及正面反射率均良好。進而，關於該等有機EL面板，確認於正面方向及斜方向之任意方向均實現中性之反射色相。另一方面，比較例1～7之有機EL面板之正面反射率並不充分，抗反射特性並不充分。 [產業上之可利用性] 本發明之附有光學補償層之偏光板可較佳地用於有機EL面板。Hereinafter, preferred embodiments of the present invention will be described, but the present invention is not limited to these embodiments. (Definition of terms and symbols) The definitions of terms and symbols in this manual are as follows. (1) Refractive index (nx, ny, nz) "nx" refers to the refractive index in the direction in which the in-plane refractive index becomes the largest (ie, the direction of the slow axis), and "ny" refers to the in-plane perpendicular to the slow axis The refractive index in the direction (ie, the direction of the advancing axis), and "nz" is the refractive index in the thickness direction. (2) In-plane retardation (Re) "Re(λ)" is the in-plane retardation measured by light with a wavelength of λ nm at 23°C. Re (λ) is calculated from the formula: Re=(nx-ny)×d when the thickness of the layer (film) is d (nm). For example, "Re(550)" is the in-plane phase difference measured by light with a wavelength of 550 nm at 23°C. (3) Thickness direction retardation (Rth) "Rth(λ)" is the thickness direction retardation measured by light with a wavelength of λ nm at 23°C. Rth(λ) is calculated from the formula: Rth=(nx-nz)×d when the thickness of the layer (film) is d (nm). For example, "Rth(550)" is the thickness direction retardation measured by light with a wavelength of 550 nm at 23°C. (4) Nz coefficient The Nz coefficient is obtained from Nz=Rth/Re. (5) Substantially orthogonal or parallel The performance of "substantially orthogonal" and "substantially orthogonal" includes the case where the angle formed by the two directions is 90°±10°, preferably 90°±7°, and more Preferably, it is 90°±5°. The expressions of "substantially parallel" and "substantially parallel" include the case where the angle formed by the two directions is 0°±10°, preferably 0°±7°, more preferably 0°±5°. Furthermore, when only referred to as "orthogonal" or "parallel" in this specification, it may include a state of being substantially orthogonal or substantially parallel. A. Overall structure of a polarizing plate with an optical compensation layer Figure 1 is a schematic cross-sectional view of a polarizing plate with an optical compensation layer in one embodiment of the present invention. The polarizing plate 100 with an optical compensation layer of this embodiment includes a polarizing element 10, a first optical compensation layer 30, and a second optical compensation layer 40 in this order. In terms of practicality, the protective layer 20 can be provided on the side of the polarizing element 10 opposite to the first optical compensation layer 30 as shown in the example of the figure. Preferably, the polarizing plate 100 with an 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 refers to, for example, a layer in which the in-plane retardation Re (550) exceeds 10 nm, and/or the thickness direction retardation Rth (550) does not reach -10 nm or exceeds 10 nm. As an optically anisotropic layer, a liquid crystal layer, a retardation film, and a protective film are mentioned, for example. When the polarizing plate with the optical compensation layer does not contain an optically anisotropic layer, in one embodiment, the first optical compensation layer 30 can function as a protective layer of the polarizing element. In another embodiment, an optically isotropic protective layer (hereinafter also referred to as the polarizing element 10 and the first optical compensation layer 30 (ie, the opposite side of the polarizing element 10 to the protective layer 20) It is the inner protective layer; not shown). Furthermore, if necessary, a conductive layer and a substrate (both not shown) may be sequentially arranged on the side of the second optical compensation layer 40 opposite to the first optical compensation layer 30 (ie, the outer side of the second optical compensation layer 40). The base material is laminated on the conductive layer in close contact. In this specification, the so-called "adhesive build-up layer" refers to the direct and fixed build-up layer of two layers without interposing an adhesive layer (for example, an adhesive layer, 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 a conductive layer and a substrate, the polarizing plate 100 with an optical compensation layer can be preferably used in an internal touch panel type input display device. The refractive index characteristic of the first optical compensation layer 30 shows a relationship of nz>nx>ny, and has a slow axis. The slow axis of the first optical compensation layer 30 and the absorption axis of the polarizing element 10 are substantially orthogonal or parallel. The refractive index characteristic of the second optical compensation layer 40 shows a relationship of nx>ny≧nz, and has a slow axis. The angle formed by the slow 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 still more preferably About 45°. If the above angle is in this range, an excellent anti-reflection function can be realized. The second optical compensation layer 40 is typically composed of a retardation film obtained by obliquely extending. As described above, arranging the first optical compensation layer showing the refractive index characteristics of nz>nx>ny on the side of the polarizing element will show the refractive index characteristics of nx>ny≧nz and show the wavelength dependence of inverse dispersion The flexible second optical compensation layer is arranged on the side away from the polarizing element, thereby suppressing the increase in reflectivity caused by the influence of the in-plane phase difference of the first optical compensation layer, and reducing the change of the reflected hue. Furthermore, such an effect becomes remarkable by optimizing the in-plane phase difference of the first optical compensation layer as described later. The polarizing plate with optical compensation layer can be monolithic or elongated. Hereinafter, each layer and optical film constituting the polarizing plate with the optical compensation layer will be described in detail. A-1. Polarizing element As the polarizing element 10, any suitable polarizing element can be used. For example, the resin film forming the polarizing element may be a single-layer resin film or a laminate of two or more layers. Specific examples of the polarizing element composed of a single-layer resin film include: high hydrophilicity to polyvinyl alcohol (PVA) film, partially formalized PVA film, ethylene-vinyl acetate copolymer partially saponified film, etc. Molecular membranes are those made by dyeing and stretching with dichroic substances such as iodine or dichroic dyes; polyolefin-based alignment films such as dehydrated PVA or dehydrochlorinated polyvinyl chloride. In terms of excellent optical properties, it is preferable to use a polarizing element obtained by dyeing a PVA-based film with iodine and performing uniaxial stretching. The above-mentioned dyeing with iodine is performed, for example, by immersing the PVA-based film in an iodine aqueous solution. The stretching magnification of the uniaxial stretching is preferably 3 to 7 times. Stretching can be done after dyeing, or it can be done while dyeing. Also, dyeing may be performed after stretching. If necessary, the PVA-based film is subjected to swelling treatment, cross-linking treatment, cleaning treatment, drying treatment, etc. For example, by immersing the PVA-based film in water for washing before dyeing, not only can the dirt or anti-caking agent on the surface of the PVA-based film be cleaned, but also the PVA-based film can be swelled to prevent uneven dyeing. As a specific example of a polarizing element obtained by using a laminate, a laminate of a resin substrate and a PVA resin layer (PVA resin film) laminated on the resin substrate, or a resin substrate and coating A polarizing element obtained by a laminate of PVA-based resin layers formed on the resin substrate. The polarizing element obtained by using a laminate of a resin substrate and a PVA-based resin layer formed on the resin substrate can be manufactured by, for example, the following steps: coating a PVA-based resin solution on the resin substrate to make it After drying, a PVA-based resin layer is formed on the resin substrate to obtain a laminate of the resin substrate and the PVA-based resin layer; the laminate is extended and dyed to form the PVA-based resin layer into a polarizing element. In this embodiment, the stretching typically includes stretching the laminate by immersing the laminate in an aqueous boric acid solution. Furthermore, the stretching may be included in the stretching in the boric acid aqueous solution as needed, and the layered body is stretched in the air at a high temperature (for example, above 95°C). The obtained resin substrate/polarizing element laminate can be used directly (that is, the resin substrate can be used as the protective layer of the polarizing element), or the resin substrate can be peeled off from the resin substrate/polarizing element laminate. The peeling area layer is used for any suitable protective layer according to the purpose. The details of the manufacturing method of such a polarizing element are described in, for example, Japanese Patent Laid-Open No. 2012-73580. The entire description of this gazette is incorporated into this specification as a 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, particularly preferably 3 μm to 8 μm. If the thickness of the polarizing element is in this range, curling during heating can be well suppressed, and good appearance durability during heating can be obtained. The polarizing element preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm. The monomer transmittance of the polarizing element is 43.0%-46.0% as described above, preferably 44.5%-46.0%. 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. The first optical compensation layer As described above, the refractive index characteristics of the first optical compensation layer 30 show the relationship of nz>nx>ny. By providing the first optical compensation layer with such optical characteristics, the reflection hue when viewed from an oblique direction can be significantly improved, and as a result, a polarizing plate with an optical compensation layer with excellent viewing angle characteristics can be obtained. Such a first optical compensation layer is usually provided on the side away from the polarizing element (for example, the outermost side of the polarizing plate with the optical compensation layer), but according to the embodiment of the present invention, it is provided on the side of the polarizing element. By adopting this structure, the in-plane phase difference of the optical compensation layer is optimized as described later, and the influence of the lag axis caused by the in-plane anisotropy of the first optical compensation layer can be avoided, and reflections can be suppressed The rate increases, and the change in reflected hue becomes smaller. The in-plane phase difference Re(550) of the first optical compensation layer is 5 nm to 150 nm, preferably 10 nm to 130 nm, more preferably 20 nm to 130 nm. If the in-plane phase difference is in this range, the increase in reflectance can be suppressed, and excellent viewing angle characteristics and anti-reflection characteristics can be achieved at the same time. The thickness direction retardation Rth(550) 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. If the retardation in the thickness direction is in this range, the increase in reflectance can be suppressed as in the case of optimizing the in-plane retardation, and excellent viewing angle characteristics and anti-reflection characteristics can be achieved at the same time. The first optical compensation layer can be formed of any suitable material. Preferably, the first optical compensation layer can include a retardation film formed of a fumaric acid diester-based resin described in JP 2012-32784 A. The thickness of the first optical compensation layer is preferably 5 μm to 80 μm, more preferably 10 μm to 50 μm. A-3. The second optical compensation layer As described above, the refractive index characteristic of the second optical compensation layer 40 shows the relationship of nx>ny≧nz. The in-plane phase difference Re(550) of the second optical compensation layer is 100 nm to 180 nm, preferably 110 nm to 170 nm, more preferably 120 nm to 160 nm. If the in-plane phase difference of the second optical compensation layer is in this range, the slow axis direction of the second optical compensation layer can be set to the above-mentioned 35°～55° with respect to the absorption axis direction of the polarizing element ( Especially the angle of about 45°), which can achieve excellent anti-reflection function. The second optical compensation layer shows the wavelength dependence of so-called inverse dispersion. Specifically, the in-plane phase difference satisfies the relationship of Re(450)<Re(550). By satisfying this relationship, an excellent reflection hue can be achieved. Re(450)/Re(550) is preferably 0.8 or more and less than 1, and more preferably 0.8 or more and 0.95 or less. The Nz coefficient of the second optical compensation layer is 1.0 to 2.0, preferably 1.0 to 1.5, and more preferably 1.0 to 1.3. By satisfying this relationship, a more excellent reflection hue can be achieved. Regarding the second optical compensation layer, the water absorption is preferably 3% or less, more preferably 2.5% or less, and still more preferably 2% or less. By satisfying such a water absorption rate, it is possible to suppress changes in display characteristics over time. In addition, the water absorption rate can be calculated based on JIS K 7209. The second optical compensation layer is typically a retardation film formed of any suitable resin. As the resin forming the retardation film, a polycarbonate resin is preferably used. As the above 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 contains: a structural unit derived from a stilbene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and a structural unit derived from alicyclic diol, alicyclic dimethanol, The structural unit of at least one dihydroxy compound in the group consisting of two, three or polyethylene glycol, and alkanediol or spirodiol. Preferably, the polycarbonate resin contains: a structural unit derived from a tea-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and a structural unit derived from alicyclic dimethanol and/or , Tri, or polyethylene glycol structural unit; more preferably, it includes: structural unit derived from stilbene-based dihydroxy compound, structural unit derived from isosorbide-based dihydroxy compound, and structural unit derived from di-, tri-, or polyethylene glycol The structural unit of diol. The polycarbonate resin may optionally contain structural units derived from other dihydroxy compounds. In addition, the details of the polycarbonate resin that can be suitably used in the present invention are described in, for example, Japanese Patent Laid-Open No. 2014-10291 and Japanese Patent Laid-Open No. 2014-26266, and this description is incorporated into this specification by reference. in. The glass transition temperature of the polycarbonate resin is preferably 110°C or higher and 180°C or lower, more preferably 120°C or higher and 165°C or lower. If the glass transition temperature is too low, the heat resistance tends to deteriorate, and there is a possibility of dimensional changes after the film is formed, and the image quality of the obtained organic EL panel may decrease. If the glass transition temperature is too high, the forming stability during film forming may deteriorate, and the transparency of the film may be impaired. In addition, the glass transition temperature is determined based on JIS K 7121 (1987). The molecular weight of the above polycarbonate resin can be represented by reduced viscosity. The reduced viscosity is determined by using dichloromethane as the solvent to accurately prepare the polycarbonate concentration to 0.6 g/dL and use a Ubbelohde viscosity tube at a temperature of 20.0℃±0.1℃. The lower limit of the concentrated viscosity is generally preferably 0.30 dL/g, more preferably 0.35 dL/g or more. The upper limit of the reduced viscosity is generally preferably 1.20 dL/g, more preferably 1.00 dL/g, and still more preferably 0.80 dL/g. If the reduced viscosity is less than the above lower limit, there may be a problem that the mechanical strength of the molded product decreases. On the other hand, if the reduced viscosity is greater than the above upper limit, the fluidity during molding may decrease and productivity or moldability may decrease. The retardation film is typically produced by extending a resin film in at least one direction. As a method of forming the above-mentioned resin film, any appropriate method can be adopted. For example, melt extrusion method (e.g. T-die molding method), cast coating method (e.g., casting method), calender molding method, hot pressing method, co-extrusion method, co-melt method, multilayer extrusion, inflation molding Law etc. Preferably, a T-die molding method, a casting method, and an inflation molding method are used. The thickness of the resin film (unstretched film) can be set to any appropriate value depending on the desired optical characteristics, the stretching conditions described later, and the like. Preferably, it is 50 μm to 300 μm. Any suitable extension method and extension conditions (e.g. extension temperature, extension ratio, extension direction) can be used for the above extension. Specifically, various extension methods such as free end extension, fixed end extension, free end contraction, and fixed end contraction can be used alone or simultaneously or sequentially. Regarding the extension direction, it may be performed in various directions or dimensions such as the horizontal direction, the vertical direction, the thickness direction, and the diagonal direction. Regarding the stretching temperature, the glass transition temperature (Tg) of the resin film is preferably Tg-30°C to Tg+60°C, more preferably Tg-10°C to Tg+50°C. By appropriately selecting the aforementioned stretching method and stretching conditions, a retardation film having the aforementioned desired optical characteristics (for example, refractive index characteristics, in-plane retardation, and Nz coefficient) can be obtained. In one embodiment, the retardation film is produced by continuously extending a long resin film obliquely in a direction at an angle θ with respect to the longitudinal direction. By adopting oblique extension, it is possible to obtain a long stretched film with an alignment angle (the lagging axis in the direction of the angle θ) at an angle θ relative to the longitudinal direction of the film, for example, when laminated with a polarizing element The realization of roll-to-roll can simplify the manufacturing steps. The absorption axis of the polarizing element is expressed in the length direction or the width direction of the elongated film due to the manufacturing method. Therefore, the aforementioned angle θ can be the angle formed by the absorption axis of the polarizing element and the late axis of the second optical compensation layer. As the stretching machine used for diagonal stretching, for example, a tenter stretching machine capable of adding a feed force, a stretching force, or a take-up force at different speeds in the horizontal and/or vertical directions can be cited. Tenter stretching machines include a horizontal uniaxial stretching machine, a simultaneous biaxial stretching machine, etc. However, any suitable stretching machine can be used as long as the long resin film can be stretched continuously and diagonally. The thickness of the retardation film (stretched film, that is, the second optical compensation layer) is preferably 20 μm to 100 μm, more preferably 20 μm to 80 μm, and 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. Laminated body The in-plane retardation Re(550) of the laminated body 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 laminate in this way, the reflected hue when viewed from an oblique direction can be significantly improved, and as a result, a polarizing plate with an optical compensation layer with very 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 of a polarizing element. Specific examples of the material that becomes the main component of the film include: cellulose resins such as triacetyl cellulose (TAC), or polyester, polyvinyl alcohol, polycarbonate, polyamide, Polyimide series, polyether series, poly series, polystyrene series, polyether series
Figure 105127376-A0304-12-0011-5
Transparent resins such as olefin-based, polyolefin-based, (meth)acrylic-based, acetate-based, etc. Also, examples may include thermosetting resins or ultraviolet curing resins such as (meth)acrylic, urethane, (meth)acrylate urethane, epoxy, silicone, etc. Wait. In addition to this, for example, glassy polymers such as silicone polymers can also be cited. In addition, the polymer film described in JP 2001-343529 A (WO01/37007) can also be used. As the material of the film, for example, a thermoplastic resin containing a substituted or unsubstituted amide group in the side chain, and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in the side chain can be used. The resin composition includes, for example, a resin composition having an alternating copolymer containing isobutylene and N-methyl maleimide, and an acrylonitrile-styrene copolymer. Such a polymer film may be, for example, an extrusion molded product of the above-mentioned resin composition. The protective layer 20 may also be subjected to surface treatments such as hard coating treatment, anti-reflection treatment, anti-sticking treatment, and anti-glare treatment as needed. Furthermore, if necessary, the protective layer 20 may be subjected to processing to improve the visibility when viewed through polarized sunglasses (representatively, imparting (elliptical) circular polarization function and imparting ultra-high phase difference). By performing such processing, even when viewing the display screen through a polarizer such as polarized sunglasses, excellent visibility can be achieved. Therefore, the polarizing plate with the optical compensation layer can also be suitably used for image display devices 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. Furthermore, in the case of surface treatment, the thickness of the protective layer includes the thickness of the surface treatment layer. When an 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 this specification, the so-called "optical isotropy" means that the in-plane retardation Re (550) is 0 nm to 10 nm, and the thickness direction retardation Rth (550) is -10 nm to +10 nm. The inner protective layer can be made of any suitable material as long as it is optically isotropic. The material can be appropriately selected, for example, from the materials described in relation to the protective layer 20. The thickness of the inner protective layer is preferably 5 μm to 200 μm, more preferably 10 μm to 100 μm, and still more preferably 15 μm to 95 μm. A-6. Conductive layer or conductive layer with substrate The conductive layer can be formed by any suitable film forming method (such as vacuum evaporation, sputtering, CVD, ion plating, spraying, etc.) A metal oxide film is formed on any suitable substrate. After the film is formed, heat treatment (for example, 100°C to 200°C) may be performed as necessary. By performing heat treatment, the amorphous film can be crystallized. Examples of metal oxides include indium oxide, tin oxide, zinc oxide, indium-tin composite oxide, tin-antimony composite oxide, zinc-aluminum composite oxide, indium-zinc composite oxide, and the like. Indium oxide may also be doped with divalent metal ions or tetravalent metal ions. It is preferably an indium-based composite oxide, and more preferably an indium-tin composite oxide (ITO). Indium-based composite oxides have the following characteristics: high transmittance (for example, 80% or more) in the visible light region (380 nm to 780 nm), and low surface resistance per unit area. When 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 resistance of the conductive layer is preferably 300 Ω/□ or less, more preferably 150 Ω/□ or less, and even more preferably 100 Ω/□ or less. The conductive layer can be transferred from the above-mentioned substrate to the second optical compensation layer, and only the conductive layer is used as the constituent layer of the polarizing plate with the optical compensation layer, or it can be a laminate with the substrate (the conductive layer with the substrate ) 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 the material constituting the substrate, any suitable resin can be cited. It is preferably a resin excellent in transparency. Specific examples include cyclic olefin resins, polycarbonate resins, cellulose resins, polyester resins, and acrylic resins. It is preferable that the above-mentioned substrate is optically isotropic, so the conductive layer can be used as a conductive layer with an isotropic substrate for a polarizing plate with an optical compensation layer. As the material constituting the optically isotropic substrate (isotropic substrate), for example, the following
Figure 105127376-A0304-12-0011-5
Materials that do not have a conjugated resin as the main skeleton such as olefin resins or olefin resins, and materials that have a cyclic structure such as a lactone ring or a glutarimide ring in the main chain of an acrylic resin. If such a material is used, when an isotropic substrate is formed, the phase difference caused by the alignment of the molecular chain can be suppressed to be small. The thickness of the substrate is preferably 10 μm to 200 μm, more preferably 20 μm to 60 μm. A-7. In addition, any suitable adhesive layer or adhesive layer can be used in the laminate of each layer constituting the polarizing plate with optical compensation layer of the present invention. 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 second optical compensation layer 40 side of the polarizing plate 100 with an optical compensation layer. By providing an adhesive layer in advance, it can be easily attached to other optical components (such as organic EL units). Furthermore, it is preferable that a release film is attached to the surface of the adhesive layer before being used. B. Manufacturing method As the manufacturing method of the above-mentioned polarizing plate with optical compensation layer, any suitable method can be adopted. In one embodiment, the polarizing plate with the optical compensation layer can be manufactured by a method including the following steps: a long resin film constituting the protective layer, a long strip of polarizing element with an absorption axis in the length direction , The elongated laminated bodies of the first optical compensation layer and the second optical compensation layer are transported in the length direction on one side respectively, and the step of layering is performed in such a way that the length direction of each side is aligned. The protective layer, the polarizing element, and the laminated body can be laminated at the same time, or the protective layer and the polarizing element can be laminated first, or the polarizing element and the laminated volume layer can be laminated first. In another embodiment, the polarizing plate with the optical compensation layer can be manufactured by a method including the following steps: combining a long resin film constituting the protective layer with a long strip having an absorption axis in the length direction The step of laminating polarizing elements to obtain a laminated film; while conveying the laminated film, while coating the surface of the polarizing element to form the first optical compensation layer; and combining the laminated film with the first optical compensation layer and the second optical The step of laminating the long strip phase difference film of the compensation layer. Here, the angle formed by the absorption axis of the polarizing element 10 and the late axis of the second optical compensation layer 40 is 35°-55° as described above, preferably 38°-52°, more preferably 42°-48 °, more preferably about 45 °. In this embodiment, the elongated retardation film constituting the second optical compensation layer has a slow axis in a direction at an angle θ with respect to its longitudinal direction. The angle θ may be the angle formed by the absorption axis of the polarizing element and the late axis of the first optical compensation layer as described above. Such retardation film can be obtained by diagonally 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 item A located on the visible side of the organic EL unit. The polarizing plate with the optical compensation layer is laminated so that the second optical compensation layer is on the side of the organic EL unit (the polarizing element is on the visible side). [Examples] Hereinafter, the present invention will be described in detail with examples, but the present invention is not limited by these examples. In addition, the measuring method of each characteristic is as follows. (1) The thickness is measured using a dial gauge (manufactured by PEACOCK, the product name is "DG-205", and a dial gauge test bench (product name is "pds-2")). (2) The phase difference is cut out from each optical compensation layer with a 50 mm×50 mm sample to prepare a measurement sample, and the measurement is performed using Axoscan manufactured by Axometrics. The measurement wavelength is 450 nm and 550 nm, and the measurement temperature is 23°C. In addition, the average refractive index was measured using an Abbe refractometer manufactured by Atago Corporation, and the refractive indexes nx, ny, and nz were calculated from the obtained retardation value. (3) The water absorption is measured in accordance with the "Test Method for Water Absorption and Boiling Water Absorption of Plastics" described in JIS K 7209. The size of the test piece is a square with a side length of 50 mm. After immersing the test piece in water with a water temperature of 25°C for 24 hours, the weight change before and after the immersion is measured to obtain the result. Unit is%. (4) Reflective hue and viewing angle characteristics To display a black image on the obtained organic EL panel, the reflective hue was measured using a viewing angle measurement and evaluation device made by Auoronic-MERCHERS, a conoscope. "Viewing angle characteristic" means 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 at a polar angle of 45°) in the xy chromaticity diagram of the CIE color system. If the Δxy is less than 0.15, the viewing angle characteristics are evaluated as good. (5) The frontal reflectance is to display a black image on the obtained organic EL panel, and the frontal reflectance is measured using a spectrophotometer CM-2600d manufactured by Konica Minolta. If 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., Trade 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 relative to the total of 100 parts by weight of diisopropyl fumarate and diethyl fumarate) and the third peroxide pivalic acid as a polymerization initiator 3.1 g of butyl ester, nitrogen gas was blown in for 1 hour, while stirring at 400 rpm, and maintaining at 50°C for 24 hours, to carry out suspension radical polymerization. After the polymerization reaction, the contents were recovered from the reactor, the polymer was separated by filtration, washed with 2000 g of distilled water 5 times, washed with 2000 g of methanol 5 times, and vacuum dried at 80°C for 6 hours to obtain The maleic acid diester-based polymer 310 g. The obtained fumaric acid diester was dissolved in MIBK, the coating liquid was applied on PET, dried at 80°C for 5 minutes, and then dried at 130°C for 5 minutes, thereby producing a retardation layer (nz >nx=ny). Further, a retardation layer having a refractive index characteristic of nz>nx>ny is formed by performing a stretching process, and this retardation layer is used as the first optical compensation layer. (Production of polycarbonate resin film) A batch polymerization device including two vertical reactors equipped with stirring blades and a reflux condenser controlled at 100°C was used for polymerization. Combine 9,9-[4-(2-hydroxyethoxy)phenyl] pyruvate (BHEPF), isosorbide (ISB), diethylene glycol (DEG), diphenyl carbonate (DPC), and magnesium acetate The tetrahydrate is charged so that the molar ratio becomes BHEPF/ISB/DEG/DPC/magnesium acetate=0.348/0.490/0.162/1.005/1.00×10 -5 . After the inside of the reactor is sufficiently replaced with nitrogen (oxygen concentration: 0.0005 to 0.001 vol%), it is heated with a heat medium, and stirring is started when the internal temperature reaches 100°C. 40 minutes after the temperature rise started, the internal temperature was brought to 220°C, and the pressure was controlled while maintaining the temperature. At the same time, the pressure was started, and the temperature was set to 13.3 kPa in 90 minutes after reaching 220°C. The phenol vapor produced by the polymerization reaction is introduced into a reflux condenser at 100°C, and a certain amount of monomer components in the phenol vapor are returned to the reactor, and the uncondensed phenol vapor is introduced to 45°C. The condenser is recovered. After nitrogen was introduced into the first reactor to temporarily return 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 for 50 minutes. Thereafter, polymerization is carried out until it becomes a specific stirring power. At the time point when the specific power is reached, nitrogen is introduced into the reactor to restore the pressure, and the reaction liquid is drawn out in the form of strands, and pelletized by a rotary cutter to obtain BHEPF/ISB/DEG=34.8/49.0/16.2[mol %] Polycarbonate resin composed of copolymerization. The polycarbonate resin has a specific concentrated viscosity of 0.430 dL/g and a glass transition temperature of 128°C. (Production of the second optical compensation layer) After vacuum drying the obtained polycarbonate resin at 80°C for 5 hours, a single-screw extruder (manufactured by Isuzu Chemical Industries, Ltd., screw diameter 25 mm, cylinder Set temperature: 220°C), T-die head (width 900 mm, set temperature: 220°C), cooling roll (set temperature: 125°C), and film forming device of the coiler to produce polycarbonate with a thickness of 130 μm Ester resin film. The water absorption rate of the obtained polycarbonate resin film was 1.2%. The polycarbonate resin film obtained in the above manner was stretched obliquely by the method according to Example 1 of Japanese Patent Laid-Open No. 2014-194483 to obtain a retardation film. The specific production sequence of the retardation film is as follows: a polycarbonate resin film (thickness 130 μm, width 765 mm) is preheated to 142°C in the preheating zone of the stretching device. In the preheating zone, the distance between the left and right clamps is 125 mm. Secondly, when the film enters the first diagonal extension zone C1, start to increase the clamp spacing of the right clamp, which increases from 125 mm to 177.5 mm in the first diagonal extension zone C1. The rate of change in clamp spacing is 1.42. In the first oblique extension area C1, the clamp spacing to the left clamp began to decrease, and in the first oblique extension area C1, it was reduced from 125 mm to 90 mm. The rate of change in clamp spacing is 0.72. Furthermore, when the film enters the second diagonal extension zone C2, the clamp spacing of the left clamp is increased, which increases from 90 mm to 177.5 mm in the second diagonal extension zone C2. On the other hand, the clamp spacing of the right clamp remains at 177.5 mm in the second diagonal extension area C2. In addition, at the same time as the above-mentioned diagonal extension, the width direction is extended by 1.9 times. Furthermore, the above-mentioned diagonal extension is performed at 135°C. Secondly, MD shrinking is performed in the shrinking zone. Specifically, the distance between the left and right clamps was reduced from 177.5 mm to 165 mm. The shrinkage rate in MD shrinking treatment is 7.0%. The retardation film (thickness 40 μm) was obtained in the above-mentioned manner. The Re(550) of the obtained retardation film is 147 nm, and the Rth(550) is 167 nm (nx: 1.5977, ny: 1.59404, nz: 1.5935), showing the refractive index characteristics of nx>ny=nz. In addition, the Re(450)/Re(550) of the obtained retardation film was 0.89. The slow axis direction of the retardation film is 45° with respect to the longitudinal direction. (Production of laminated body) On the retardation film (the second optical compensation layer), the retardation layer (the first optical compensation layer) is bonded via an acrylic adhesive by roll-to-roll, and then the substrate The film was removed, and a laminate in which the retardation layer (first optical compensation layer) was transferred onto the retardation film (second optical compensation layer) was obtained. (Production of polarizing element) For a long roll of 30 μm polyvinyl alcohol (PVA) resin film (manufactured by Kuraray, product name "PE3000"), the length becomes 5.9 times the length by a roll stretcher The method is to perform uniaxial stretching in the length direction, simultaneously perform swelling, dyeing, crosslinking, and cleaning treatments, and finally perform a drying treatment, thereby fabricating a polarizing element with a thickness of 12 μm. Specifically, the swelling treatment is extended to 2.2 times while being treated with pure water at 20°C. Secondly, the dyeing process is performed in such a way that the monomer transmittance of the obtained polarizing element becomes 45.0%, while the iodine concentration is adjusted and the weight ratio of iodine to potassium iodide is 1:7 in an aqueous solution at 30°C, while extending To 1.4 times. Furthermore, the cross-linking treatment adopts a two-stage cross-linking treatment. The first-stage cross-linking treatment is carried out in an aqueous solution of boric acid and potassium iodide dissolved at 40°C, and the side is extended to 1.2 times. The boric acid content of the aqueous solution of the crosslinking treatment in the first stage was 5.0% by weight, and the potassium iodide content was 3.0% by weight. The second stage of cross-linking treatment is carried out in an aqueous solution of boric acid and potassium iodide dissolved at 65°C, and the side is extended to 1.6 times. The boric acid content of the aqueous solution of the crosslinking treatment in the second stage was set to 4.3% by weight, and the potassium iodide content was set to 5.0% by weight. In addition, the cleaning treatment was performed by a potassium iodide aqueous solution at 20°C. The potassium iodide content of the aqueous cleaning solution was set to 2.6% by weight. Finally, the drying process was dried at 70°C for 5 minutes to obtain a polarizing element. (Production of polarizing plate) On one side of the above-mentioned polarizing element, it is laminated to the TAC film by roll-to-roll via a polyvinyl alcohol-based adhesive. The one side of the TAC film has a hard coating (HC) formed by hard coating Layer of HC-TAC film (thickness: 32 μm, corresponding to the protective layer) to obtain a long strip of polarizing plate with a protective layer/polarizing element composition. (Production of Polarizing Plate with Optical Compensation Layer) The polarizing element surface of the polarizing plate obtained above and the first optical compensation layer/second optical compensation layer laminated body obtained above were combined with an acrylic adhesive. 1 The optical compensation layer is laminated by roll-to-roll to obtain a long strip of polarizing plate with optical compensation layer composed of protective layer/polarizing element/first optical compensation layer/second optical compensation layer. (Production of organic EL panel) On the second optical compensation layer side of the obtained polarizing plate with optical compensation layer, the adhesive layer is formed by acrylic adhesive, and the cut-out size is 50 mm×50 mm. Disassemble the smartphone (Galaxy-S5) manufactured by Samsung Wireless and take out the organic EL panel. The polarizing film attached to the organic EL panel is peeled off, and instead, the polarizing plate with optical compensation layer cut out above is attached to obtain the organic EL panel. The reflection characteristics of the obtained organic EL panel were measured by the procedure of (4) above. The result confirmed that a neutral reflection hue was achieved in any direction of the front direction and the oblique direction. In addition, the results of viewing angle characteristics and frontal reflectance are shown in Table 1. [Table 1]
Figure 105127376-A0304-0001
 [Examples 2 to 6 and Comparative Examples 1 to 7] With the configurations shown in Table 1, a polarizing plate with an optical compensation layer and an organic EL panel were produced. In addition, Comparative Examples 1 to 3 are those in which the stacking order of the optical compensation layer and the second optical compensation layer is substantially reversed with respect to Examples 3 to 5, respectively. The obtained polarizing plate and organic EL panel with an optical compensation layer were used for the same evaluation as in Example 1. As shown in Table 1, the viewing angle characteristics and front reflectance of the organic EL panels of Examples 2 to 6 are good. Furthermore, regarding these organic EL panels, it was confirmed that a neutral reflection hue was achieved in any of the front direction and the oblique direction. On the other hand, the front reflectance of the organic EL panels of Comparative Examples 1 to 7 is not sufficient, and the anti-reflection properties are not sufficient. [Industrial Applicability] The polarizing plate with optical compensation layer of the present invention can be preferably used in organic EL panels.

10‧‧‧偏光元件20‧‧‧保護層30‧‧‧第1光學補償層40‧‧‧第2光學補償層100‧‧‧附有光學補償層之偏光板10‧‧‧Polarizing element 20‧‧‧Protection layer 30‧‧‧First optical compensation layer 40‧‧‧Second optical compensation layer 100‧‧‧Polarizing plate with optical compensation layer

圖1係本發明之一實施形態之附有光學補償層之偏光板之概略剖視圖。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.

10‧‧‧偏光元件 10‧‧‧Polarizing element

20‧‧‧保護層 20‧‧‧Protection layer

30‧‧‧第1光學補償層 30‧‧‧The first optical compensation layer

40‧‧‧第2光學補償層 40‧‧‧Second optical compensation layer

100‧‧‧附有光學補償層之偏光板 100‧‧‧Polarizer with optical compensation layer

Claims (4)

一種附有光學補償層之偏光板，其依序具備偏光元件、第1光學補償層及第2光學補償層，且該第1光學補償層顯示出nz>nx>ny之折射率特性，Re(550)為5nm~150nm、Rth(550)為-240nm~-20nm，該第2光學補償層顯示出nx>ny≧nz之折射率特性，Re(550)為100nm~180nm、Nz係數為1.0~2.0，且滿足Re(450)<Re(550)之關係，其於有機EL面板中使用，並且上述偏光元件之吸收軸方向與上述第1光學補償層之遲相軸方向實質上正交或平行，且該偏光元件之吸收軸與上述第2光學補償層之遲相軸所成之角度為35°~55；此處，Re(450)及Re(550)分別表示23℃下藉由波長為450nm及550nm之光測得之面內相位差，Rth(550)表示23℃下藉由波長為550nm之光測得之厚度方向之相位差。 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 sequence, and the first optical compensation layer shows the refractive index characteristics of nz>nx>ny, Re( 550) is 5nm~150nm, Rth(550) is -240nm~-20nm, the second optical compensation layer shows the refractive index characteristic of nx>ny≧nz, Re(550) is 100nm~180nm, and the Nz coefficient is 1.0~ 2.0, and satisfies the relationship of Re(450)<Re(550), which is used in organic EL panels, and 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 angle between the absorption axis of the polarizing element and the late axis of the second optical compensation layer is 35°~55; here, Re(450) and Re(550) respectively indicate that the wavelength is The in-plane phase difference measured by light of 450nm and 550nm, Rth(550) represents the thickness direction phase difference measured by light of 550nm at 23°C. 如請求項1之附有光學補償層之偏光板，其中上述第2光學補償層係進行斜向延伸而獲得之相位差膜。 The polarizing plate with optical compensation layer of claim 1, wherein the second optical compensation layer is a retardation film obtained by obliquely extending. 如請求項1或2之附有光學補償層之偏光板，其於上述第2光學補償層之與上述第1光學補償層相反側進而依序具備導電層及基材。 For example, the polarizing plate with an optical compensation layer of claim 1 or 2, further comprising a conductive layer and a base material on the side opposite to the first optical compensation layer of the second optical compensation layer. 一種有機EL面板，其具備如請求項1至3中任一項之附有光學補償層之偏光板。 An organic EL panel provided with a polarizing plate attached with an optical compensation layer as in any one of claims 1 to 3.
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