TW201727289A - Circular polarizing plate and flexible image display device using same - Google Patents

Circular polarizing plate and flexible image display device using same Download PDF

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TW201727289A
TW201727289A TW105140812A TW105140812A TW201727289A TW 201727289 A TW201727289 A TW 201727289A TW 105140812 A TW105140812 A TW 105140812A TW 105140812 A TW105140812 A TW 105140812A TW 201727289 A TW201727289 A TW 201727289A
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layer
polarizing plate
film
resin
protective layer
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TW105140812A
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TWI715691B (en
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Tadashi Kojima
Takashi Shimizu
Kentarou Takeda
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Nitto Denko Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • 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
    • H10K50/00—Organic light-emitting devices
    • 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
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • 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
    • 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
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Polarising Elements (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

Provided is a circular polarizing plate which has a low susceptibility to curling caused by changes in state or changes over time, and which, when employed in a flexible image display device, can suppress curvature and warpage undesirable in the image display device. The circular polarizing plate of the present invention has, in the following order, a first protective layer, a polarizer, a second protective layer, and a retardation layer having an in-plane retardation Re (550) of 80-200 nm. The moisture permeability of the second protective layer at 40 DEG C and 92% relative humidity is below 160 g/m2/24H. This circular polarizing plate can be used in a flexible image display device.

Description

圓偏光板及使用其之可撓性圖像顯示裝置Circular polarizing plate and flexible image display device using same

本發明係關於一種圓偏光板及使用其之可撓性圖像顯示裝置。The present invention relates to a circular polarizing plate and a flexible image display device using the same.

近年來，由智慧型手機為代表之智慧型元件或者數位標牌或視窗顯示器等顯示裝置於較強之外界光下使用之機會在增加。伴隨於此，產生因顯示裝置本身或被用於顯示裝置之觸控面板部或玻璃基板、金屬配線等反射體引起之外界光反射或背景之映入等問題。尤其是，近年來正實用化之有機電致發光(EL)顯示裝置由於具有反射性較高之金屬層，故而容易產生外界光反射或背景之映入等問題。因此，已知有藉由於視認側設置具有相位差膜(代表性而言為λ/4板)之圓偏光板作為抗反射膜而防止該等問題之方法。 另外，關於有機EL顯示裝置，業界正推進利用液晶顯示裝置所不具有之特徵且具有可撓性或可彎曲(可摺疊)之構成的有機EL顯示裝置之實用化。但是，若使用先前之圓偏光板，則存在會產生有機EL顯示裝置所不期望之彎曲及/或翹曲之問題。 [先前技術文獻] [專利文獻] 專利文獻1：日本專利特開2010-139548號公報 專利文獻2：日本專利特開2003-207640號公報 專利文獻3：日本專利特開2004-226842號公報 專利文獻4：日本專利第3815790號 專利文獻5：日本專利特開2014-170221號公報In recent years, there has been an increase in the use of smart components represented by smart phones or display devices such as digital signage or window displays for use in strong outside light. Along with this, problems such as reflection of external light or reflection of a background caused by a display device itself or a touch panel such as a touch panel portion, a glass substrate, or a metal wiring used for a display device are generated. In particular, an organic electroluminescence (EL) display device that has been put into practical use in recent years has a problem of external light reflection or background reflection due to a metal layer having high reflectivity. Therefore, there has been known a method of preventing such problems by providing a circularly polarizing plate having a retardation film (typically, a λ/4 plate) as an antireflection film on the viewing side. In addition, the organic EL display device is being put into practical use in an organic EL display device having a structure that is not provided by a liquid crystal display device and that is flexible or bendable (foldable). However, if a conventional circular polarizing plate is used, there is a problem that undesired bending and/or warpage of the organic EL display device occurs. [Prior Art Document] [Patent Document] Patent Document 1: Japanese Patent Laid-Open Publication No. JP-A No. No. Publication No. JP-A No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. 4: Japanese Patent No. 3815790 Patent Document 5: Japanese Patent Laid-Open No. 2014-170221

[發明所欲解決之問題] 本發明係為了解決上述先前之問題而完成者，其主要目的在於提供一種圓偏光板，該圓偏光板因狀態變化及經時變化引起之捲曲均較小，於應用於可撓性圖像顯示裝置之情形時能夠抑制該圖像顯示裝置所不期望之彎曲及翹曲。 [解決問題之技術手段] 本發明之圓偏光板依序具有第1保護層、偏光元件、第2保護層及面內相位差Re(550)為80 nm～200 nm之相位差層，且該第2保護層於40℃、相對濕度92%下之透濕度未達160 g/m2 /24 H。該圓偏光板被用於可撓性圖像顯示裝置。 於一實施形態中，上述第2保護層被省略，而上述相位差層兼作上述偏光元件之保護層，且該相位差層於40℃、相對濕度92%下之透濕度未達160 g/m2 /24 H。 於一實施形態中，上述偏光元件之吸收軸與上述相位差層之遲相軸所成之角度θ為35°～55°。 於一實施形態中，上述圓偏光板進而於上述第1保護層之外側具有硬塗層。 於一實施形態中，上述圓偏光板進而於上述相位差層側之最外部具有黏著劑層，且於該黏著劑層表面暫時黏有剝離襯墊。 於一實施形態中，上述圓偏光板於上述第1保護層側之最外部暫時黏有表面保護膜。 於一實施形態中，上述圓偏光板於暫時黏有上述剝離襯墊及上述表面保護膜之狀態、該剝離襯墊被剝離去除但暫時黏有該表面保護膜之狀態以及該剝離襯墊及該表面保護膜均被剝離去除之狀態之各狀態下，在25℃±5℃、相對濕度55%±10%之環境下放置72小時，於該情形時捲曲量為±6 mm以內。 本發明之另一態樣提供一種可撓性圖像顯示裝置。該圖像顯示裝置具備上述圓偏光板。 [發明之效果] 根據本發明，藉由使圓偏光板中鄰接於偏光元件之顯示單元側之層之透濕度最佳化，可實現因狀態變化(代表性而言，表面保護膜之剝離及/或剝離襯墊之剝離)以及經時變化引起之捲曲均較小之圓偏光板。其結果，於將圓偏光板應用於可撓性圖像顯示裝置之情形時，可較佳地抑制該圖像顯示裝置所不期望之彎曲及翹曲。[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 circularly polarizing plate which is less curled due to a change in state and a change over time. When applied to a flexible image display device, it is possible to suppress undesired bending and warpage of the image display device. [Means for Solving the Problems] The circularly polarizing plate of the present invention sequentially has a first protective layer, a polarizing element, a second protective layer, and a phase difference layer having an in-plane retardation Re (550) of 80 nm to 200 nm. The second protective layer has a moisture permeability of less than 160 g/m 2 /24 H at 40 ° C and a relative humidity of 92%. This circular polarizing plate is used for a flexible image display device. In one embodiment, the second protective layer is omitted, and the retardation layer also serves as a protective layer of the polarizing element, and the phase difference layer has a moisture permeability of less than 160 g/m at 40 ° C and a relative humidity of 92%. 2 / 24 H. In one embodiment, an angle θ between an absorption axis of the polarizing element and a slow axis of the phase difference layer is 35° to 55°. In one embodiment, the circular polarizing plate further has a hard coat layer on the outer side of the first protective layer. In one embodiment, the circular polarizing plate further has an adhesive layer on the outermost side of the retardation layer side, and a release liner is temporarily adhered to the surface of the adhesive layer. In one embodiment, the circular polarizing plate temporarily adheres to the outermost surface of the first protective layer side with a surface protective film. In one embodiment, the circular polarizing plate is in a state in which the release liner and the surface protective film are temporarily adhered, and the release liner is peeled off, but the surface protective film is temporarily adhered, and the release liner and the release liner In each state in which the surface protective film was peeled off, it was allowed to stand in an environment of 25 ° C ± 5 ° C and a relative humidity of 55% ± 10% for 72 hours, and in this case, the amount of curl was within ± 6 mm. Another aspect of the present invention provides a flexible image display device. This image display device includes the above-described circular polarizing plate. [Effect of the Invention] According to the present invention, by changing the moisture permeability of the layer adjacent to the display unit side of the polarizing element in the circularly polarizing plate, it is possible to achieve a change in state (typically, peeling of the surface protective film and / or peeling of the release liner) and a circular polarizer having a small curl caused by changes over time. As a result, when a circularly polarizing plate is applied to a flexible image display device, undesired bending and warpage of the image display device can be preferably suppressed.

以下，對本發明之實施形態進行說明，但本發明並不限定於該等實施形態。 (用語及符號之定義) 本說明書中之用語及符號之定義如下所述。 (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)」係以23℃下之波長λ nm之光測得之面內相位差。例如，「Re(550)」係以23℃下之波長550 nm之光測得之面內相位差。Re(λ)係將層(膜)之厚度設為d(nm)時藉由式：Re(λ)＝(nx﹣ny)×d而求出。 (3)厚度方向之相位差(Rth) 「Rth(λ)」係以23℃下之波長λ nm之光測得之厚度方向之相位差。例如，「Rth(550)」係以23℃下之波長550 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)時藉由式：Rth(λ)＝(nx﹣nz)×d而求出。 (4)Nz係數 Nz係數係藉由Nz＝Rth/Re而求出。 A.圓偏光板之全體構成 關於本發明之實施形態之圓偏光板，代表性而言，能夠用於可撓性圖像顯示裝置(代表性而言為有機EL顯示裝置)。圖1係本發明之一實施形態之圓偏光板之概略剖視圖。本實施形態之圓偏光板100依序具有第1保護層11、偏光元件20、第2保護層12及相位差層30。於圓偏光板100中，代表性而言，第1保護層11成為視認側，相位差層30成為圖像顯示裝置之顯示單元側。相位差層30之面內相位差Re(550)為80 nm～200 nm。相位差層30代表性而言，作為所謂λ/4板發揮功能。偏光元件20之吸收軸與相位差層30之遲相軸所成之角度θ代表性而言為35°～55°，較佳為38°～52°，更佳為42°～48°，進而較佳為約45°。 於一實施形態中，圓偏光板100亦可如圖示例般，進而於第1保護層11之外側具有硬塗層40。於一實施形態中，圓偏光板100亦可進而具有另一相位差層(未圖示)。另一相位差層之光學特性(例如面內相位差、厚度方向相位差、Nz係數、折射率特性)、數量、組合、配置位置等可視目的而適當設定。於一實施形態中，圓偏光板100亦可進而具有導電層或附導電層之各向同性基材(均未圖示)。於該情形時，圓偏光板可應用於在顯示單元(例如有機EL單元)與偏光板之間組入有觸控感測器之所謂內部觸控面板型輸入顯示裝置。 實用上，圓偏光板100亦可如圖示例般，進而於相位差層30側之最外部具有黏著劑層50。藉由預先設置有黏著劑層，能夠容易地貼合於其他光學構件(例如圖像顯示裝置之顯示單元)。於該情形時，較佳為於將圓偏光板供以使用前，於黏著劑層50表面暫時黏附剝離襯墊60來保護黏著劑層50。進而，實用上，圓偏光板100亦可如圖示例般，於第1保護層11側之最外部暫時黏有表面保護膜70。再者，於本說明書中，表面保護膜係指作業時暫時保護圓偏光板之膜，係與第1保護層11、第2保護層12之類的偏光元件之保護層(偏光元件保護膜)不同者。 構成圓偏光板之各層或光學膜係經由任意適當之接著層(接著劑層或黏著劑層)而積層。作為構成接著劑層之接著劑，代表性而言，可例舉的是聚乙烯醇系接著劑。作為構成黏著劑層之黏著劑，代表性而言，可例舉的是丙烯酸系黏著劑。 於本發明中，第2保護層12於40℃、相對濕度92%下之透濕度未達160 g/m2 /24 H。再者，於本發明之一實施形態中，可省略第2保護層12，而相位差層30兼作偏光元件20之保護層。於該情形時，相位差層30於40℃、相對濕度92%下之透濕度未達160 g/m2 /24 H即可。即，根據本發明之實施形態，藉由使鄰接於偏光元件20之顯示單元側之層之透濕度最佳化，可實現因狀態變化(代表性而言，表面保護膜之剝離及/或剝離襯墊之剝離)以及經時變化引起之捲曲均較小之圓偏光板。其結果，於將圓偏光板應用於可撓性圖像顯示裝置之情形時，可較佳地抑制該圖像顯示裝置所不期望之彎曲及翹曲。即，本發明之實施形態係解決將圓偏光板應用於可撓性(或可摺疊性)圖像顯示裝置後所首次明確出之問題。此係因膜之透濕度受膜之構成材料本身之特性及膜厚度之兩者之影響，結果藉由維持鄰接於偏光元件之顯示單元側之層(膜)所期望之光學特性並且對材料及厚度之最佳化反覆進行試誤而獲得之未預期之優異之效果。再者，透濕度可根據JIS Z 0208(杯式法)進行測定。 本發明之實施形態之圓偏光板於(i)暫時黏有剝離襯墊60及表面保護膜70之狀態、(ii)剝離襯墊60被剝離去除但暫時黏有表面保護膜70之狀態以及(iii)剝離襯墊60及表面保護膜70均被剝離去除之狀態之各狀態下，在25℃±5℃、相對濕度55%±10%之環境下(代表性而言，無塵室環境下)放置72小時，於該情形時捲曲量較佳為±6 mm以內，更佳為±5 mm以內，進而較佳為±4 mm以內。尤其是，本發明之實施形態之圓偏光板之特徵在於因狀態(iii)下之經時變化引起之捲曲量較小。即，自先前以來已對狀態(i)及(ii)下之捲曲進行控制，於先前之剛性圖像顯示裝置中，僅該等狀態下之捲曲之控制便已足夠。另一方面，已知藉由將因狀態(iii)下之經時變化引起之捲曲量設為上述範圍，可較佳地抑制可撓性(或可摺疊性)圖像顯示裝置本身之彎曲及翹曲。如上所述，藉由使鄰接於偏光元件之顯示單元側之層之透濕度最佳化，可控制因狀態(iii)下之經時變化引起之捲曲量。 上述實施形態可進行適當組合，亦可對上述實施形態中之構成要素施加業界自明之改變。又，亦可以光學上等效之構成置換上述實施形態中之構成要素。 以下，對圓偏光板之各構成要素，進行更詳細之說明。 B.第1保護層 第1保護層11由可用作偏光元件之保護層的任意適當之膜形成。作為成為該膜之主成分之材料之具體例，可例舉的是：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&#158665;烯系、聚烯烴系、(甲基)丙烯酸系、乙酸系等之透明樹脂等。又，亦可例舉的是：(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、矽酮系等之熱硬化型樹脂或紫外線硬化型樹脂等。此外，例如亦可例舉的是矽氧烷系聚合物等之玻璃質系聚合物。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，例如可使用如下樹脂組合物，該樹脂組合物含有側鏈具有經取代或未經取代之醯亞胺基的熱塑性樹脂、及側鏈具有經取代或未經取代之苯基以及腈基的熱塑性樹脂，例如可例舉的是具有包含異丁烯與N-甲基順丁烯二醯亞胺之交替共聚物、及丙烯腈-苯乙烯共聚物的樹脂組合物。該聚合物膜例如可為上述樹脂組合物之擠出成形物。 只要可獲得本發明之效果，則第1保護層之厚度可採用任意適當之厚度。第1保護層之厚度例如為5 μm～70 μm，較佳為15 μm～50 μm。再者，於實施有下述表面處理之情形時，第1保護層之厚度係包含表面處理層之厚度在內的厚度。 本發明之圓偏光板代表性而言，配置於圖像顯示裝置之視認側，第1保護層11代表性而言，配置於其視認側。因此，亦可視目的而對第1保護層11實施任意適當之表面處理。於一實施形態中，可進行硬塗處理而如上所述般設置硬塗層40。作為構成硬塗層之材料，例如可例舉的是以丙烯酸系樹脂(丙烯酸酯、丙烯酸胺基甲酸酯)、環氧系樹脂為主成分之紫外線硬化型樹脂。硬塗層可藉由如下方式形成，即，將包含此種紫外線硬化型樹脂之單體或低聚物及視需要之光聚合起始劑及調平劑的溶液，塗佈於第1保護層並進行乾燥，對該經乾燥之塗佈層照射光(代表性而言為紫外線)而使其硬化。作為表面處理之另一具體例，可例舉的是抗反射處理、抗沾黏處理、防眩處理。進而/或者，亦可視需要對第1保護層11實施對隔著偏光太陽眼鏡進行視認之情形時之視認性進行改善之處理(代表性而言，賦予(楕)圓偏光功能、賦予超高相位差)。藉由實施此種處理，即便於隔著偏光太陽眼鏡等偏光透鏡對顯示畫面進行視認之情形時，亦可實現優異之視認性。因此，圓偏光板亦可較佳地應用於能夠在室外使用之圖像顯示裝置。 C.偏光元件 作為偏光元件20，可採用任意適當之偏光元件。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。 作為由單層之樹脂膜構成之偏光元件之具體例，可例舉的是：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利用碘或二色性染料等二色性物質實施染色處理及延伸處理者、PVA之脫水處理物或聚氯乙烯之脫氯化氫處理物等多烯系配向膜等。就光學特性優異之方面而言，較佳為使用將PVA系膜利用碘進行染色並單軸延伸而獲得之偏光元件。 上述利用碘進行之染色例如藉由將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、洗淨處理、乾燥處理等。例如，藉由於染色之前將PVA系膜浸漬於水中進行水洗，而不僅可洗淨PVA系膜表面之污漬或抗黏連劑，亦可使PVA系膜膨潤而防止染色不均等。 作為使用積層體獲得之偏光元件之具體例，可例舉的是使用樹脂基材與積層於該樹脂基材之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之PVA系樹脂層之積層體而獲得之偏光元件例如可藉由如下方式製作，即，將PVA系樹脂溶液塗佈於樹脂基材並使其乾燥而於樹脂基材上形成PVA系樹脂層而獲得樹脂基材與PVA系樹脂層之積層體；將該積層體延伸及染色而將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，延伸視需要可進而包含於進行硼酸水溶液中之延伸之前將積層體在高溫(例如95℃以上)下進行空中延伸。所獲得之樹脂基材/偏光元件之積層體可直接使用(即，亦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並於該剝離面積層視目的之任意適當之保護層而使用。此種偏光元件之製造方法之詳細內容例如於日本專利特開2012-73580號公報中有所記載。該公報之全部記載作為參考引用於本說明書中。 偏光元件之厚度較佳為25 μm以下，更佳為1 μm～22 μm，進而較佳為1 μm～12 μm，特佳為3 μm～12 μm。偏光元件之厚度只要為此種範圍，則可較佳地抑制加熱時之捲曲、且可獲得良好之加熱時之外觀耐久性。 偏光元件較佳為對波長380 nm～780 nm之任一波長表現出吸收二色性。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，進而較佳為99.9%以上。 D.第2保護層 第2保護層12於40℃、相對濕度92%下之透濕度如上所述未達160 g/m2 /24 H，較佳為155 g/m2 /24 H以下，更佳為150 g/m2 /24 H以下。藉由將透濕度設為此種範圍，而可如上述般實現因狀態變化(代表性而言，表面保護膜之剝離及/或剝離襯墊之剝離)以及經時變化引起之捲曲均較小之圓偏光板。再者，第2保護層之透濕度之下限例如為10 g/m2 /24 H。 只要能夠具有上述透濕度，則第2保護層由可用作偏光元件之保護層的任意適當之膜形成。作為第2保護層之形成材料，代表性而言，可例舉的是丙烯酸系樹脂。於一實施形態中，使用具有戊二醯亞胺結構之(甲基)丙烯酸系樹脂作為丙烯酸系樹脂。具有戊二醯亞胺結構之(甲基)丙烯酸系樹脂例如於日本專利特開2006-309033號公報、日本專利特開2006-317560號公報、日本專利特開2006-328329號公報、日本專利特開2006-328334號公報、日本專利特開2006-337491號公報、日本專利特開2006-337492號公報、日本專利特開2006-337493號公報、日本專利特開2006-337569號公報、日本專利特開2007-009182號公報、日本專利特開2009-161744號公報、日本專利特開2010-284840號公報中有所記載。該等記載作為參考而引用於本說明書中。 於另一實施形態中，使用具有內酯環結構之(甲基)丙烯酸系樹脂作為丙烯酸系樹脂。具有內酯環結構之(甲基)丙烯酸系樹脂例如於日本專利特開2000-230016號公報、日本專利特開2001-151814號公報、日本專利特開2002-120326號公報、日本專利特開2002-254544號公報、日本專利特開2005-146084號公報中有所記載。該等記載作為參考而引用於本說明書中。 上述(甲基)丙烯酸系樹脂之Tg(玻璃轉移溫度)較佳為115℃以上，更佳為120℃以上，進而較佳為125℃以上，特佳為130℃以上。其原因在於可使耐久性優異。上述(甲基)丙烯酸系樹脂之Tg之上限值並無特別限定，就成形性等觀點而言，較佳為170℃以下。 上述(甲基)丙烯酸系樹脂之質量平均分子量(亦有時稱為重量平均分子量)較佳為1000～2000000，更佳為5000～1000000，進而較佳為10000～500000，特佳為50000～500000。 第2保護層12較佳為光學各向同性。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，且厚度方向之相位差Rth(550)為-10 nm～+10 nm。 第2保護層之厚度例如為15 μm～35 μm，較佳為15 μm～25 μm。若為此種厚度，則可維持作為偏光元件之內側(顯示單元側)保護層所期望之光學特性並且實現上述透濕度。 E.相位差層 相位差層30可視目的而具有任意適當之光學特性及/或機械特性。相位差層30代表性而言具有遲相軸。關於相位差層30之遲相軸與偏光元件11之吸收軸所成之角度θ，如上所述，代表性而言為35°～55°，較佳為38°～52°，更佳為42°～48°，進而較佳為約45°。若角度θ為此種範圍，則可藉由將相位差層30如下述般設為λ/4板，可獲得具有非常優異之圓偏光特性(結果為非常優異之抗反射特性)之圓偏光板。 相位差層30較佳為折射率特性表現出nx＞ny≧nz之關係。相位差層代表性而言，係為了賦予偏光板抗反射特性而設置，可作為λ/4板發揮功能。相位差層之面內相位差Re(550)如上所述為80 nm～200 nm，較佳為100 nm～180 nm，更佳為110 nm～170 nm。再者，此處，「ny＝nz」不僅包含ny與nz完全相等之情形，亦包含ny與nz實質上相等之情形。因此，於無損本發明之效果之範圍內，有可能存在成為ny＜nz之情形。 相位差層之Nz係數較佳為0.9～3，更佳為0.9～2.5，進而較佳為0.9～1.5，特佳為0.9～1.3。藉由滿足此種關係，而於將獲得之圓偏光板用於圖像顯示裝置之情形時，可達成非常優異之反射色相。 相位差層可表現出相位差值隨測定光之波長變大之逆波長色散特性，亦可表現出相位差值隨測定光之波長變小之正波長色散特性，亦可表現出相位差值幾乎不隨測定光之波長變化之平穩之波長色散特性。於一實施形態中，相位差層顯示逆波長色散特性。於該情形時，相位差層之Re(450)/Re(550)較佳為0.8以上且未達1，更佳為0.8以上且0.95以下。若為此種構成，則可實現非常優異之抗反射特性。於另一實施形態中，相位差層顯示平穩之波長色散特性。於該情形時，相位差層之Re(450)/Re(550)較佳為0.99～1.03，Re(650)/Re(550)較佳為0.98～1.02。 相位差層包含光彈性係數之絕對值較佳為2×10-11 m2 /N以下、更佳為2.0×10-13 m2 /N～1.5×10-11 m2 /N、進而較佳為1.0×10-12 m2 /N～1.2×10-11 m2 /N之樹脂。若光彈性係數之絕對值為此種範圍，則於加熱時產生收縮應力之情形時，不易產生相位差變化。其結果，可較佳地防止所獲得之圖像顯示裝置之熱不均。 於如上所述般第2保護層12被省略而相位差層30兼作偏光元件20之保護層之情形時，相位差層於40℃、相對濕度92%下之透濕度如上所述未達160 g/m2 /24 H，較佳為120 g/m2 /24 H以下，更佳為100 g/m2 /24 H以下。藉由將透濕度設為此種範圍，而可如上述般實現因狀態變化(代表性而言，表面保護膜之剝離及/或剝離襯墊之剝離)以及經時變化引起之捲曲均較小之圓偏光板。再者，相位差層之透濕度之下限例如為10 g/m2 /24 H。 相位差層之厚度較佳為60 μm以下，較佳為30 μm～58 μm。若為此種厚度，則可維持作為賦予圓偏光功能之λ/4板所期望之光學特性並且實現上述透濕度。 相位差層30可由能夠滿足上述特性之任意適當之樹脂膜構成。作為此種樹脂之代表例，可例舉的是：環烯烴系樹脂、聚碳酸酯系樹脂、纖維素系樹脂、聚酯系樹脂、聚乙烯醇系樹脂、聚醯胺系樹脂、聚醯亞胺系樹脂、聚醚系樹脂、聚苯乙烯系樹脂、丙烯酸系樹脂。於相位差層由表現出逆波長色散特性之樹脂膜構成之情形時，可較佳地使用聚碳酸酯系樹脂，於相位差層由表現出平穩之波長色散特性之樹脂膜構成之情形時，可較佳地使用環烯烴系樹脂。 作為上述聚碳酸酯樹脂，只要可獲得本發明之效果，則可使用任意適當之聚碳酸酯樹脂。聚碳酸酯樹脂較佳為包含：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、及源自選自由脂環式二醇、脂環式二甲醇、二乙二醇、三乙二醇或聚乙二醇以及伸烷基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。聚碳酸酯樹脂較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、及源自脂環式二甲醇之結構單元以及/或者源自二乙二醇、三乙二醇或聚乙二醇之結構單元，進而較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乙二醇、三乙二醇或聚乙二醇之結構單元。聚碳酸酯樹脂亦可視需要含有源自其他二羥基化合物之結構單元。再者，可較佳地用於本發明之聚碳酸酯樹脂之詳細內容例如於日本專利特開2014-10291號公報、日本專利特開2014-26266號公報中有所記載，該等記載作為參考而引用於本說明書中。 於一實施形態中，可使用包含寡聚茀結構單元之聚碳酸酯系樹脂。作為包含寡聚茀結構單元之聚碳酸酯系樹脂，例如可例舉的是包含下述通式(1)所表示之結構單元及/或下述通式(2)所表示之結構單元之樹脂。 [化1](上述通式(1)及上述通式(2)中，R5 及R6 分別獨立為直接鍵、經取代或未經取代之碳數1～4之伸烷基(較佳為主鏈上之碳數為2～3之伸烷基)。R7 為直接鍵、經取代或未經取代之碳數1～4之伸烷基(較佳為主鏈上之碳數為1～2之伸烷基)。R8 ～R13 分別獨立為氫原子、經取代或未經取代之碳數1～10(較佳為1～4，更佳為1～2)之烷基、經取代或未經取代之碳數4～10(較佳為4～8，更佳為4～7)之芳基、經取代或未經取代之碳數1～10(較佳為1～4，更佳為1～2)之醯基、經取代或未經取代之碳數1～10(較佳為1～4，更佳為1～2)之烷氧基、經取代或未經取代之碳數1～10(較佳為1～4，更佳為1～2)之芳氧基、經取代或未經取代之碳數1～10(較佳為1～4，更佳為1～2)之醯氧基、經取代或未經取代之胺基、經取代或未經取代之碳數1～10(較佳為1～4)之乙烯基、經取代或未經取代之碳數1～10(較佳為1～4)之乙炔基、具有取代基之硫原子、具有取代基之矽原子、鹵素原子、硝基或氰基。R8 ～R13 之中相鄰之至少2個基亦可相互鍵結而形成環) 於一實施形態中，寡聚茀結構單元中所包含之茀環具有R8 ～R13 全部為氫原子之構成、或具有R8 及/或R13 為選自由鹵素原子、醯基、硝基、氰基及磺基所組成之群之任一者且R9 ～R12 為氫原子之構成。 包含寡聚茀結構單元之聚碳酸酯系樹脂之詳細內容例如於日本專利特開2015-212816號公報等中有所記載。該等專利文獻之記載作為參考而引用於本說明書中。 上述聚碳酸酯樹脂之玻璃轉移溫度較佳為110℃以上且150℃以下，更佳為120℃以上且140℃以下。若玻璃轉移溫度過低，則有耐熱性變差之傾向，存在膜成形後發生尺寸變化之可能性，又，存在使所獲得之有機EL面板之圖像品質下降之情況。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況，又，存在損害膜之透明性之情況。再者，玻璃轉移溫度係根據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，並於溫度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，進而較佳為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況。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而生產性或成形性降低之問題之情況。 亦可使用市售之膜作為聚碳酸酯系樹脂膜。作為市售品之具體例，可例舉的是：帝人公司製造之商品名「PURE-ACE WR-S」、「PURE-ACE WR-W」、「PURE-ACE WR-M」、日東電工公司製造之商品名「NRF」。 環烯烴系樹脂係將環烯烴作為聚合單元而進行聚合之樹脂之總稱，例如可例舉的是日本專利特開平1-240517號公報、日本專利特開平3-14882號公報、日本專利特開平3-122137號公報等中所記載之樹脂。作為具體例，可例舉的是：環烯烴之開環(共)聚合物、環烯烴之加成聚合物、環烯烴與乙烯、丙烯等α-烯烴之共聚物(代表性而言為無規共聚物)、及利用不飽和羧酸或其衍生物使該等改性而成之接枝改性體、以及其等之氫化物。作為環烯烴之具體例，可例舉的是降&#158665;烯系單體。作為降&#158665;烯系單體，可例舉的是：例如降&#158665;烯及其烷基及/或亞烷基取代體，例如5-甲基-2-降&#158665;烯、5-二甲基-2-降&#158665;烯、5-乙基-2-降&#158665;烯、5-丁基-2-降&#158665;烯、5-亞乙基-2-降&#158665;烯等、該等之鹵基等極性基取代體；二環戊二烯、2,3-二氫二環戊二烯等；二甲基八氫化萘、其烷基及/或亞烷基取代體、及鹵基等極性基取代體，例如6-甲基-1,4：5,8-二甲基-1,4,4a,5,6,7,8,8a-八氫化萘、6-乙基-1,4：5,8-二甲基-1,4,4a,5,6,7,8,8a-八氫化萘、6-亞乙基-1,4：5,8-二甲基-1,4,4a,5,6,7,8,8a-八氫化萘、6-氯-1,4：5,8-二甲基-1,4,4a,5,6,7,8,8a-八氫化萘、6-氰基-1,4：5,8-二甲基-1,4,4a,5,6,7,8,8a-八氫化萘、6-吡啶基-1,4：5,8-二甲基-1,4,4a,5,6,7,8,8a-八氫化萘、6-甲氧基羰基-1,4：5,8-二甲基-1,4,4a,5,6,7,8,8a-八氫化萘等；環戊二烯之三～四聚物，例如4,9：5,8-二甲基-3a,4,4a,5,8,8a,9,9a-八氫-1H-芴、4,11：5,10：6,9-三甲基-3a,4,4a,5,5a,6,9,9a,10,10a,11,11a-十二氫-1H-環戊并蒽等。 於本發明中，於無損本發明之目的之範圍內，可併用能夠開環聚合之其他環烯烴類。作為此種環烯烴之具體例，例如可例舉的是環戊烯、環辛烯、5,6-二氫二環戊二烯等具有1個反應性雙鍵的化合物。 上述環烯烴系樹脂其藉由利用甲苯溶劑進行之凝膠滲透層析法(GPC，gel permeation chromatography)測得之數量平均分子量(Mn)較佳為25,000～200,000，進而較佳為30,000～100,000，最佳為40,000～80,000。若數量平均分子量為上述範圍，則可製成機械強度優異、溶解性、成形性、流延之操作性良好者。 亦可使用市售之膜作為上述環烯烴系樹脂膜。作為具體例，可例舉的是：日本瑞翁公司製造之商品名「ZEONEX」、「ZEONOR」、JSR公司製造之商品名「Arton」、TICONA公司製造之商品名為「TOPAS」、三井化學公司製造之商品名「APEL」。 相位差層30例如可藉由將由上述樹脂形成之膜延伸而獲得。作為由樹脂形成膜之方法，可採用任意適當之成形加工法。作為具體例，可例舉的是壓縮成形法、轉移成形法、射出成形法、擠出成形法、吹塑成形法、粉末成形法、FRP(Fiber Reinforced Plastics，纖維強化塑膠)成形法、塗鑄法(例如流延法)、壓延成形法、熱壓法等。較佳為擠出成形法或塗鑄法。其原因在於可提高所獲得之膜之平滑性，獲得良好之光學均勻性。成形條件可根據所使用之樹脂之組成或種類、相位差層所期望之特性等而適當設定。再者，如上所述，關於聚碳酸酯系樹脂或環烯烴系樹脂，市售有多種膜製品，因此，亦可將該市售膜直接供於延伸處理。 樹脂膜(未延伸膜)之厚度可根據相位差層之所期望之厚度、所期望之光學特性、下述延伸條件等而設定為任意適當之值。較佳為50 μm～300 μm。 上述延伸可採用任意適當之延伸方法、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，亦可於長度方向、寬度方向、厚度方向、斜方向等各種方向或維度上進行。 於一實施形態中，相位差膜藉由將樹脂膜單軸延伸或將樹脂膜固定端單軸延伸而製作。作為固定端單軸延伸之具體例，可例舉的是使樹脂膜一面沿長度方向移行一面沿寬度方向(橫方向)延伸之方法。延伸倍率較佳為1.1倍～3.5倍。 於另一實施形態中，相位差膜可藉由將長條狀之樹脂膜於相對於長度方向為上述角度θ之方向上連續斜向延伸而製作。藉由採用斜向延伸，而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)的長條狀之延伸膜，例如能夠於與偏光元件積層時實現卷對卷式，能夠簡化製造步驟。再者，角度θ可為圓偏光板中偏光元件之吸收軸與相位差層之遲相軸所成之角度。如上所述，角度θ代表性而言為35°～55°，較佳為38°～52°，更佳為42°～48°，進而較佳為約45°。 作為用於斜向延伸之延伸機，例如可例舉的是能夠於橫及/或縱方向上附加左右速度不同之進給力或拉伸力或者拉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，則可使用任意之適當之延伸機。 藉由分別適當地控制上述延伸機中左右之速度，可獲得具有上述所期望之面內相位差且於上述所期望之方向上具有遲相軸之相位差層(實質上為長條狀之相位差膜)。 上述膜之延伸溫度可隨相位差層所期望之面內相位差值及厚度、所使用之樹脂之種類、所使用之膜之厚度、延伸倍率等而變化。具體而言，延伸溫度較佳為Tg﹣30℃～Tg＋60℃，進而較佳為Tg﹣15℃～Tg＋55℃，最佳為Tg﹣10℃～Tg＋50℃。藉由於此種溫度下進行延伸，可獲得本發明中具有適當特性之第1相位差層。再者，Tg係膜之構成材料之玻璃轉移溫度。 藉由適當選擇上述延伸方法、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。 F.導電層或附導電層之各向同性基材 導電層可藉由任意適當之成膜方法(例如真空蒸鍍法、濺鍍法、CVD(Chemical Vapor Deposition，化學氣相沈積)法、離子鍍覆法、噴霧法等)，於任意之適當之基材上成膜金屬氧化物膜而形成。作為金屬氧化物，例如可例舉的是氧化銦、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。其中，較佳為銦-錫複合氧化物(ITO)。 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。 導電層可自上述基材轉印至相位差層而單獨以導電層作為圓偏光板之構成層，亦可以與基材之積層體(附導電層之基材)之形式積層於相位差層。上述基材較佳為光學各向同性，因此，導電層可作為附導電層之各向同性基材而用於圓偏光板。 作為光學各向同性之基材(各向同性基材)，可採用任意適當之各向同性基材。作為構成各向同性基材之材料，例如可例舉的是以降&#158665;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的材料等。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產生之相位差之表現抑制為較小。各向同性基材之厚度較佳為50 μm以下，更佳為35 μm以下。各向同性基材之厚度之下限例如為20 μm。 上述導電層及/或上述附導電層之各向同性基材之導電層可視需要被圖案化。藉由圖案化，可形成導通部及絕緣部。結果可形成電極。電極可作為對於觸控面板之接觸進行感知之觸控感測器電極發揮功能。作為圖案化方法，可採用任意適當之方法。作為圖案化方法之具體例，可例舉的是濕式蝕刻法、網版印刷法。 G.圖像顯示裝置 上述A項至F項中所記載之圓偏光板能夠應用於可撓性圖像顯示裝置。因此，本發明包含使用此種圓偏光板之可撓性圖像顯示裝置。作為可撓性圖像顯示裝置之代表例，可例舉的是有機EL顯示裝置。本發明之實施形態之可撓性圖像顯示裝置於其視認側具備上述A項至F項中所記載之圓偏光板。圓偏光板係以相位差層成為顯示單元(例如有機EL單元)側之方式(以偏光元件成為視認側之方式)進行積層。 可撓性有機EL顯示裝置例如可藉由利用可撓性或可摺疊性材料構成有機EL單元之基板而實現。作為此種材料，代表性而言，可例舉的是賦予有可撓性之薄玻璃、熱塑性樹脂或熱硬化性樹脂膜、合金、金屬。作為熱塑性樹脂或熱硬化性樹脂，例如可例舉的是：聚酯系樹脂、聚醯亞胺系樹脂、環氧系樹脂、聚胺基甲酸酯系樹脂、聚苯乙烯系樹脂、聚烯烴系樹脂、聚醯胺系樹脂、聚碳酸酯系樹脂、矽酮系樹脂、氟系樹脂、丙烯腈-丁二烯-苯乙烯共聚物樹脂。作為合金，例如可例舉的是不鏽鋼、36合金、42合金。作為金屬，例如可例舉的是銅、鎳、鐵、鋁、鈦。 有機EL顯示裝置之構成於業界眾所周知，故而省略詳細之說明。再者，可撓性或可摺疊性有機EL顯示裝置之詳細內容例如於專利第4601463號或專利第4707996號中有所記載。該等記載作為參考而引用於本說明書中。 [實施例] 以下，藉由實施例具體地說明本發明，但本發明並不受該等實施例之限定。再者，各特性之測定方法如下所述。 (1)厚度 使用數位式測微計(Anritsu公司製造之KC-351C)進行測定。 (2)相位差層之相位差值 藉由自動雙折射測定裝置(王子計測機器股份有限公司製造，自動雙折射計KOBRA-WPR)，對實施例及比較例中使用之相位差層之折射率nx、ny及nz進行測量。面內相位差Re之測定波長為450 nm及550 nm，厚度方向相位差Rth之測定波長為550 nm，測定溫度為23℃。 (3)透濕度 對構成第2保護層或相位差層之膜，按照JIS Z 0208(杯式法)進行測定。 (4)捲曲量 針對實施例及比較例中所獲得之圓偏光板，對於在(i)暫時黏有剝離襯墊及表面保護膜之狀態、(ii)剝離襯墊被剝離去除但暫時黏有表面保護膜之狀態以及(iii)剝離襯墊及表面保護膜均被剝離去除之狀態之各狀態下，在25℃±5℃、無塵室(相對濕度55%±10%)環境下放置72小時之情形之捲曲量進行測定。具體而言，於未產生靜電之基台上，使圓偏光板以其中央部與台座接觸之方式靜置，經過72小時後，利用鋼製角規測定圓偏光板之翹曲，將四角之翹曲中最高者設為捲曲量。進而，將圓偏光板向第1保護層側(硬塗層側)翹曲之情形設為「正」，將向第2保護層側(黏著劑層側)翹曲之情形設為「負」。將捲曲量為±6 mm以內之情形設為「良好」，將捲曲量超過6 mm之情形設為「不良」。 [參考例1：偏光板之製作] 將厚度60 μm之聚乙烯醇(PVA)系樹脂膜(可樂麗公司製造，製品名「PE6000」)之長條輥，一面利用輥延伸機以沿長條方向成為5.9倍之方式於長條方向上進行單軸延伸，一面同時實施膨潤、染色、交聯、洗淨處理，最後實施乾燥處理，藉此，製作厚度22 μm之偏光元件1。 具體而言，膨潤處理係一面於20℃之純水中進行處理一面延伸至2.2倍。繼而，染色處理係以所獲得之偏光元件之單體透過率成為45.0%之方式一面於調整過碘濃度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℃之溶解有硼酸及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℃之溶解有硼酸及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，洗淨處理係於20℃之碘化鉀水溶液中進行處理。洗淨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1。 於所獲得之偏光元件1之兩面，經由聚乙烯醇系接著劑分別貼合具有戊二醯亞胺環結構之甲基丙烯酸系樹脂膜(厚度：20 μm，對應於第2保護層)及於TAC膜之單面具有經硬塗處理所形成之硬塗(HC)層的HC-TAC膜(厚度：47 μm，對應於第1保護層)，而獲得具有第1保護層/偏光元件1/第2保護層之構成之偏光板1。 再者，具有戊二醯亞胺環結構之甲基丙烯酸系樹脂膜係以如下方式製作。將具有戊二醯亞胺環結構之甲基丙烯酸系樹脂顆粒於100.5 kPa、100℃下乾燥12小時，利用單軸擠出機於模嘴溫度270℃下自T字模擠出，而成形為膜狀。將所獲得之膜沿其搬送方向(MD)，於較上述樹脂之玻璃轉移溫度Tg高10℃之環境下進行延伸，繼而，沿與搬送方向正交之方向(TD)，於較上述樹脂之玻璃轉移溫度Tg高7℃之環境下進行延伸。所獲得之膜表現出實質上光學各向同性。 [參考例2：偏光板之製作] 將厚度30 μm之聚乙烯醇(PVA)系樹脂膜(可樂麗製造，製品名「PE3000」)之長條輥，一面利用輥延伸機以沿長條方向成為5.9倍之方式於長條方向上進行單軸延伸，一面同時實施膨潤、染色、交聯、洗淨處理，最後實施乾燥處理，藉此，製作厚度12 μm之偏光元件2。於所獲得之偏光元件2之單面，經由聚乙烯醇系接著劑貼合在聚碳酸酯系樹脂膜之單面具有經硬塗處理所形成之硬塗(HC)層的HC-PC膜(厚度：25 μm，對應於第1保護層)，而獲得具有第1保護層/偏光元件2之構成之偏光板2。 [參考例3：偏光板之製作] 於參考例2中所獲得之偏光元件2之兩面，經由聚乙烯醇系接著劑分別貼合Konica Minolta股份有限公司製造之TAC膜(製品名：KC2UA，厚度：25 μm，對應於第2保護層)及於該TAC膜之單面具有經硬塗處理所形成之硬塗(HC)層的HC-TAC膜(厚度：32 μm，對應於第1保護層)，而獲得具有第1保護層/偏光元件2/第2保護層之構成之偏光板3。 [參考例4：偏光板之製作] 除使用Konica Minolta公司製造之TAC膜(製品名：KC2CT1，厚度：20 μm)作為第2保護層以外，以與參考例1同樣之方式獲得具有第1保護層/偏光元件1/第2保護層之構成之偏光板4。 [參考例5：偏光板之製作] 將厚度60 μm之聚乙烯醇(PVA)系樹脂膜(可樂麗製造，製品名「PE6000」)之長條輥，一面利用輥延伸機以沿長條方向成為5.9倍之方式於長條方向上進行單軸延伸，一面同時實施膨潤、染色、交聯、洗淨處理，最後實施乾燥處理，藉此，製作厚度23 μm之偏光元件3。於所獲得之偏光元件3之單面，經由聚乙烯醇系接著劑貼合在TAC膜之單面具有經低反射硬塗處理所形成之硬塗(HC)層的低反射TAC膜(厚度：71 μm，對應於第1保護層，大日本印刷股份有限公司製造，製品名「DSG-03HL」)，而獲得具有第1保護層/偏光元件3之構成之偏光板5。 [參考例6：構成相位差層之相位差膜之製作] 1.聚碳酸酯樹脂膜之製作 將26.2質量份之異山梨酯(ISB)、100.5質量份之9,9-[4-(2-羥基乙氧基)苯基]茀(BHEPF)、10.7質量份之1,4-環己烷二甲醇(1,4-CHDM)、105.1質量份之碳酸二苯酯(DPC)及0.591質量份之作為觸媒之碳酸銫(0.2質量%水溶液)分別投入至反應容器，於氮氣環境下，作為反應之第1階段步驟，將反應容器之熱媒溫度設為150℃，視需要一面進行攪拌，一面使原料溶解(約15分鐘)。 繼而，將反應容器內之壓力自常壓設為13.3 kPa，一面使反應容器之熱媒溫度歷時1小時上升至190℃，一面將產生之苯酚抽出至反應容器外。 使反應容器內溫度於190℃下保持15分鐘後，作為第2階段步驟，將反應容器內之壓力設為6.67 kPa，使反應容器之熱媒溫度歷時15分鐘上升至230℃，並將產生之苯酚抽出至反應容器外。由於攪拌機之攪拌轉矩上升，因此歷時8分鐘升溫至250℃，進而，為了將產生之苯酚去除，將反應容器內之壓力減壓至0.200 kPa以下。於達到特定之攪拌轉矩後，結束反應，將所生成之反應物擠出至水中後，進行顆粒化，而獲得BHEPF/ISB/1,4-CHDM＝47.4莫耳%/37.1莫耳%/15.5莫耳%之聚碳酸酯樹脂。 所獲得之聚碳酸酯樹脂之玻璃轉移溫度為136.6℃，比濃黏度為0.395 dL/g。 將所獲得之聚碳酸酯樹脂於80℃下真空乾燥5小時後，使用具備有單軸擠出機(五十鈴化工機械公司製造，螺桿直徑25 mm，料缸設定溫度：220℃)、T字模(寬度200 mm，設定溫度：220℃)、冷卻輥(設定溫度：120～130℃)及捲取機的膜製膜裝置，製作厚度120 μm之聚碳酸酯樹脂膜。 2.相位差膜之製作 使用拉幅延伸機，將所獲得之聚碳酸酯樹脂膜橫向延伸，而獲得厚度50 μm之相位差膜。此時，延伸倍率為250%，延伸溫度設為137～139℃。 所獲得之相位差膜之Re(550)為137～147 nm，Re(450)/Re(550)為0.89，Nz係數為1.21，配向角(遲相軸之方向)相對於長條方向為90°。將該相位差膜用作相位差層1。 [參考例7：構成相位差層之相位差膜之製作] 除了製作厚度140 μm之聚碳酸酯樹脂膜以外，以與參考例6同樣之方式獲得厚度55 μm之相位差膜。所獲得之相位差膜之Re(550)為147 nm，Re(450)/Re(550)為0.89，Nz係數為1.21，配向角(遲相軸之方向)相對於長條方向為90°。將該相位差膜用作相位差層2。 [參考例8：構成相位差層之相位差膜之製作] 1.聚碳酸酯樹脂膜之製作 將38.06重量份(0.059 mol)之雙[9-(2-苯氧基羰基甲基)茀-9-基]甲烷、53.73重量份(0.368 mol)之異山梨酯(Roquette Freres公司製造，商品名為「POLYSORB」)、9.64重量份(0.067 mol)之1,4-環己烷二甲醇(順式、反式混合物，SK Chemical公司製造)、81.28重量份(0.379 mol)之碳酸二苯酯(三菱化學公司製造)及3.83×10-4 重量份(2.17×10-6 mol)之作為觸媒之乙酸鈣一水合物投入至反應容器，對反應裝置內進行減壓氮氣置換。於氮氣環境下，於150℃下歷時約10分鐘，一面進行攪拌一面使原料溶解。作為反應第1階段步驟，歷時30分鐘升溫至220℃並於常壓下反應60分鐘。繼而，歷時90分鐘將壓力自常壓減壓至13.3 kPa，於13.3 kPa下保持30分鐘，將所產生之苯酚抽出至反應系外。繼而，作為反應第2階段步驟，一面使熱媒溫度歷時15分鐘升溫至240℃，一面將壓力歷時15分鐘減壓至0.10 kPa以下，並將產生之苯酚抽出至反應系外。於達到特定之攪拌轉矩後，利用氮氣複壓至常壓並使反應停止，將所生成之聚酯碳酸酯擠出至水中，並對線料進行切割，而獲得聚碳酸酯樹脂顆粒。 2.相位差膜之製作 將由上述聚碳酸酯樹脂顆粒構成之膜斜向延伸，而獲得厚度58 μm之相位差膜。此時，延伸方向設為相對於膜之長度方向為45°。又，延伸倍率調整為2～3倍以使相位差膜表現λ/4之相位差。又，延伸溫度設為148℃(即，未延伸改性聚碳酸酯膜之Tg＋5℃)。所獲得之相位差膜之Re(550)為141 nm，Re(450)/Re(550)為0.83，Nz係數為1.1，光彈性係數為16×10-12 Pa，配向角(遲相軸之方向)相對於長條方向為45°。將該相位差膜用作相位差層3。 [實施例1] 將偏光板1之第2保護層面與相位差層1以偏光元件之吸收軸與相位差層之遲相軸所成之角度成為45°之方式經由丙烯酸系黏著劑貼合，而獲得圓偏光板1。於所獲得之圓偏光板1之相位差層面設置丙烯酸系黏著劑層(厚度15 μm)，於該黏著劑層表面暫時黏附剝離襯墊。進而，於第1保護層面暫時黏附表面保護膜。保護膜係使用於厚度38 μm之PET膜塗佈有厚度10 μm之黏著劑者。再者，第2保護層於40℃、相對濕度92%下之透濕度為150 g/m2 /24 H。將所獲得之圓偏光板1供至上述(4)之捲曲量之評價。將結果表示於表1。進而，自可撓性有機EL顯示裝置(Samsung公司製造，商品名為「Galaxy S6 Edge」)取出有機EL單元。另一方面，將剝離襯墊自圓偏光板1剝離，經由黏著劑層而於該有機EL單元貼合圓偏光板1。進而，將表面保護膜自貼合於有機EL單元之圓偏光板剝離。將貼合有圓偏光板1之有機EL單元，於23℃、55%RH之條件下放置72小時後，目視觀察有無翹曲。其結果，翹曲及彎曲均未出現。 [實施例2] 將偏光板2之偏光元件面與相位差層2以偏光元件之吸收軸與相位差層之遲相軸所成之角度成為45°之方式經由PVA系接著劑貼合，而獲得圓偏光板2。於所獲得之圓偏光板2之相位差層面設置丙烯酸系黏著劑層(厚度15 μm)，於該黏著劑層表面暫時黏附剝離襯墊。進而，於第1保護層面暫時黏附表面保護膜。再者，相位差層於40℃、相對濕度92%下之透濕度為70 g/m2 /24 H。將所獲得之圓偏光板2供至上述(4)之捲曲量之評價。將結果表示於表1。進而，與實施例1同樣地，將所獲得之圓偏光板2貼合於有機EL單元，並供至與實施例1相同之評價。其結果，翹曲及彎曲均未出現。 [實施例3] 將偏光板5之偏光元件面與相位差層3以偏光元件之吸收軸與相位差層之遲相軸所成之角度成為45°之方式經由PVA系接著劑貼合，而獲得圓偏光板5。於所獲得之圓偏光板5之相位差層面設置丙烯酸系黏著劑層(厚度20 μm)，於該黏著劑層表面暫時黏附剝離襯墊。進而，於第1保護層面暫時黏附表面保護膜。再者，相位差層於40℃、相對濕度92%下之透濕度為80 g/m2 /24 H。將所獲得之圓偏光板5供至上述(4)之捲曲量之評價。將結果表示於表1。進而，與實施例1同樣地，將所獲得之圓偏光板5貼合於有機EL單元，並供至與實施例1相同之評價。其結果，翹曲及彎曲均未出現。 [比較例1] 將偏光板3之偏光元件面與相位差層1以偏光元件之吸收軸與相位差層之遲相軸所成之角度成為45°之方式經由丙烯酸系黏著劑貼合，而獲得圓偏光板3。於所獲得之圓偏光板3之相位差層面設置丙烯酸系黏著劑層(厚度15 μm)，於該黏著劑層表面暫時黏附剝離襯墊。進而，於第1保護層面暫時黏附表面保護膜。再者，第2保護層於40℃、相對濕度92%下之透濕度為1000 g/m2 /24 H。將所獲得之圓偏光板3供至上述(4)之捲曲量之評價。將結果表示於表1。進而，與實施例1同樣地，將所獲得之圓偏光板3貼合於有機EL單元，並供至與實施例1相同之評價。其結果，確認出翹曲。 [比較例2] 將偏光板4之偏光元件面與相位差層1以偏光元件之吸收軸與相位差層之遲相軸所成之角度成為45°之方式經由丙烯酸系黏著劑貼合，而獲得圓偏光板4。於所獲得之圓偏光板4之相位差層面設置丙烯酸系黏著劑層(厚度15 μm)，於該黏著劑層表面暫時黏附剝離襯墊。進而，於第1保護層面暫時黏附表面保護膜。再者，第2保護層於40℃、相對濕度92%下之透濕度為1500 g/m2 /24 H。將所獲得之圓偏光板4供至上述(4)之捲曲量之評價。將結果表示於表1。進而，與實施例1同樣地，將所獲得之圓偏光板4貼合於有機EL單元，並供至與實施例1相同之評價。其結果，確認出翹曲。 [表1] ＜評價＞ 由表1可知，本發明之實施例之圓偏光板於將剝離襯墊及表面保護膜剝離之狀態下因經時變化引起之捲曲量較小。結果確認於應用於可撓性圖像顯示裝置之情形時可較佳地抑制圖像顯示裝置本身之彎曲或翹曲。 [產業上之可利用性] 本發明之圓偏光板可較佳地用於可撓性圖像顯示裝置(例如有機EL顯示裝置)。Hereinafter, 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. For example, "Re(550)" is an in-plane phase difference measured by light having a wavelength of 550 nm at 23 °C. Re (λ) is obtained by setting the thickness of the layer (film) to d (nm) by the formula: Re (λ) = (nx - ny) × d. (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. For example, "Rth(550)" is a phase difference in the thickness direction measured by light having a wavelength of 550 nm at 23 °C. Rth (λ) is obtained by setting the thickness of the layer (film) to d (nm) by the formula: Rth (λ) = (nx - nz) × d. (4) The Nz coefficient Nz coefficient is obtained by Nz=Rth/Re. A. The entire configuration of the circularly polarizing plate according to the embodiment of the present invention can be used for a flexible image display device (typically, an organic EL display device). Fig. 1 is a schematic cross-sectional view showing a circularly polarizing plate according to an embodiment of the present invention. The circularly polarizing plate 100 of the present embodiment has the first protective layer 11, the polarizing element 20, the second protective layer 12, and the retardation layer 30 in this order. In the circularly polarizing plate 100, typically, the first protective layer 11 is on the viewing side, and the retardation layer 30 is on the display unit side of the image display device. The in-plane phase difference Re (550) of the phase difference layer 30 is 80 nm to 200 nm. The phase difference layer 30 typically functions as a so-called λ/4 plate. The angle θ between the absorption axis of the polarizing element 20 and the retardation axis of the phase difference layer 30 is typically 35° to 55°, preferably 38° to 52°, more preferably 42° to 48°, and further It is preferably about 45°. In one embodiment, the circularly polarizing plate 100 may have a hard coat layer 40 on the outer side of the first protective layer 11 as shown in the example. In one embodiment, the circularly polarizing plate 100 may further have another retardation layer (not shown). The optical characteristics (for example, in-plane phase difference, thickness direction phase difference, Nz coefficient, and refractive index characteristic), number, combination, arrangement position, and the like of the other retardation layer are appropriately set depending on the purpose. In one embodiment, the circular polarizing plate 100 may further have a conductive layer or an isotropic substrate with a conductive layer (none of which is shown). In this case, the circular polarizing plate can be applied to a so-called internal touch panel type input display device in which a touch sensor is incorporated between a display unit (for example, an organic EL unit) and a polarizing plate. Practically, the circularly polarizing plate 100 may have an adhesive layer 50 on the outermost side of the phase difference layer 30 side as shown in the example. By providing an adhesive layer in advance, it can be easily bonded to other optical members (for example, display units of an image display device). In this case, it is preferable to temporarily adhere the release liner 60 to the surface of the adhesive layer 50 to protect the adhesive layer 50 before the circularly polarizing plate is used. Further, in practical use, the circularly polarizing plate 100 may temporarily adhere the surface protective film 70 to the outermost portion of the first protective layer 11 side as shown in the example. In the present specification, the surface protective film refers to a film that temporarily protects the circularly polarizing plate during work, and is a protective layer (polarizing element protective film) of a polarizing element such as the first protective layer 11 and the second protective layer 12 . Different people. The layers or optical films constituting the circularly polarizing plate are laminated via any suitable adhesive layer (adhesive layer or adhesive layer). Typical examples of the adhesive constituting the adhesive layer include a polyvinyl alcohol-based adhesive. The adhesive which constitutes the adhesive layer is typically an acrylic adhesive. In the present invention, the second protective layer 12 has a moisture permeability of less than 160 g/m at 40 ° C and a relative humidity of 92%. 2 /24 H. Furthermore, in one embodiment of the present invention, the second protective layer 12 can be omitted, and the phase difference layer 30 also serves as a protective layer for the polarizing element 20. In this case, the phase difference layer 30 has a moisture permeability of less than 160 g/m at 40 ° C and a relative humidity of 92%. 2 /24 H can be. That is, according to the embodiment of the present invention, it is possible to achieve a change in state (typically, peeling and/or peeling of the surface protective film by optimizing the moisture permeability of the layer adjacent to the display unit side of the polarizing element 20). The peeling of the liner) and the circular polarizing plate which is less curled by the change over time. As a result, when a circularly polarizing plate is applied to a flexible image display device, undesired bending and warpage of the image display device can be preferably suppressed. That is, the embodiment of the present invention solves the problem that is first clarified after the circular polarizing plate is applied to a flexible (or foldable) image display device. This is because the moisture permeability of the film is affected by both the properties of the constituent materials of the film and the film thickness, and as a result, the desired optical properties and the materials are maintained by maintaining the layer (film) adjacent to the display unit side of the polarizing element. The optimization of the thickness is carried out in an unexpected manner to obtain an unexpectedly superior effect. Further, the moisture permeability can be measured in accordance with JIS Z 0208 (cup method). In the circular polarizing plate of the embodiment of the present invention, (i) the state in which the release liner 60 and the surface protection film 70 are temporarily adhered, and (ii) the release liner 60 is peeled off but the surface protection film 70 is temporarily adhered and ( Iii) in a state where the release liner 60 and the surface protective film 70 are both removed and removed, in an environment of 25 ° C ± 5 ° C and a relative humidity of 55% ± 10% (representatively, in a clean room environment) When left for 72 hours, the amount of curling in this case is preferably within ±6 mm, more preferably within ±5 mm, and even more preferably within ±4 mm. In particular, the circularly polarizing plate according to the embodiment of the present invention is characterized in that the amount of curling due to the change with time in the state (iii) is small. That is, since the curls in the states (i) and (ii) have been controlled since the previous one, in the conventional rigid image display device, only the control of the curl in these states is sufficient. On the other hand, it is known that the bending of the flexible (or foldable) image display device itself can be preferably suppressed by setting the amount of curl due to the temporal change under the state (iii) to the above range. Warping. As described above, by optimizing the moisture permeability of the layer adjacent to the display unit side of the polarizing element, the amount of curl due to the temporal change under the state (iii) can be controlled. The above embodiments can be combined as appropriate, and the constituent elements in the above embodiments can be changed in a self-evident manner. Further, the constituent elements in the above embodiments may be replaced by optically equivalent configurations. Hereinafter, each constituent element of the circularly polarizing plate will be described in more detail. B. First Protective Layer The first protective layer 11 is formed of any suitable film that can be used as a protective layer for a polarizing element. Specific examples of the material which is a main component of the film include a cellulose resin such as triacetyl cellulose (TAC), a polyester system, a polyvinyl alcohol system, a polycarbonate system, and a polyamide. A transparent resin such as a polyene amide, a polyether oxime, a polyfluorene, a polystyrene, or a polyethylene, a polyolefin, a (meth)acrylic acid, or an acetic acid. Further, thermosetting resins such as (meth)acrylic acid, urethane-based, (meth)acrylic acid urethane-based, epoxy-based or fluorenone-based resins, or ultraviolet rays may be exemplified. Hardened resin, etc. Further, for example, a glassy polymer such as a siloxane-based polymer may also be exemplified. Further, a polymer film described in JP-A-2001-343529 (WO01/37007) can also be used. As a material of the film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted quinone imine group in a side chain and a substituted or unsubstituted phenyl group in a side chain may be used. Further, the nitrile-based thermoplastic resin may, for example, be a resin composition having an alternating copolymer of isobutylene and N-methylbutyleneimine and an acrylonitrile-styrene copolymer. The polymer film can be, for example, an extrusion molded product of the above resin composition. The thickness of the first protective layer may be any appropriate thickness as long as the effects of the present invention are obtained. The thickness of the first protective layer is, for example, 5 μm to 70 μm, preferably 15 μm to 50 μm. Further, in the case where the following surface treatment is carried out, the thickness of the first protective layer is the thickness including the thickness of the surface treated layer. The circularly polarizing plate of the present invention is typically disposed on the viewing side of the image display device, and the first protective layer 11 is typically disposed on the viewing side. Therefore, any appropriate surface treatment can be applied to the first protective layer 11 for the purpose. In one embodiment, the hard coat layer 40 can be provided as described above by performing a hard coat treatment. The material constituting the hard coat layer is, for example, an ultraviolet curable resin containing an acrylic resin (acrylic acid ester, urethane urethane) or an epoxy resin as a main component. The hard coat layer can be formed by applying a solution containing a monomer or oligomer of such an ultraviolet curable resin and, if necessary, a photopolymerization initiator and a leveling agent to the first protective layer. Drying is carried out, and the dried coating layer is irradiated with light (typically ultraviolet rays) to be cured. As another specific example of the surface treatment, antireflection treatment, anti-sticking treatment, and anti-glare treatment can be exemplified. Furthermore, it is also possible to improve the visibility of the first protective layer 11 when it is visually recognized by the polarized sunglasses, as needed (typically, the circular polarization function is given and the ultra-high phase is imparted. difference). 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 circular polarizing plate can also be preferably applied to an image display device that can be used outdoors. C. Polarizing Element As the polarizing element 20, 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 a polyvinyl alcohol (PVA) film, a partially formalized PVA film, and an ethylene-vinyl acetate copolymer partially saponified film. The hydrophilic polymer film is subjected to a dyeing treatment, a stretching treatment, a dehydration treatment of PVA, or a polyene alignment film such as a dehydrochlorination treatment of polyvinyl chloride, using a dichroic material such as iodine or a dichroic dye. In terms of excellent optical characteristics, a polarizing element obtained by dyeing a PVA-based film by iodine and uniaxially stretching is preferably used. The dyeing by iodine described above 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 film in water for washing before dyeing, not only the stain or the 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 laminate of 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 forming a laminate of a PVA-based resin layer of the resin substrate. A polarizing element obtained by using a resin substrate and a laminate of a PVA-based resin layer formed on the resin substrate can be produced, for example, by applying a PVA-based resin solution to a resin substrate. The PVA-based resin layer was formed by drying on a resin substrate to obtain a laminate of a resin substrate and a PVA-based resin layer. The laminate was stretched and dyed to form a PVA-based resin layer as a polarizing element. In the present embodiment, the stretching is typically carried out by immersing the layered body in an aqueous boric acid solution for stretching. Further, the extension may be further included in the airborne extension of the laminate at a high temperature (for example, 95 ° C or higher) before the elongation in the aqueous boric acid solution. The laminated body of the obtained resin substrate/polarizing element can be used as it is (that is, the resin substrate can also 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 stripping area layer is used depending on any suitable protective layer for the purpose. The details of the method for producing such a polarizing element are described in, for example, 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 22 μm, still more preferably 1 μm to 12 μm, and particularly preferably 3 μm to 12 μm. When the thickness of the polarizing element is in such a range, it is possible to preferably suppress curling during heating and obtain excellent appearance durability upon heating. 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. D. The second protective layer of the second protective layer 12 at 40 ° C, relative humidity of 92%, the moisture permeability is less than 160 g / m as described above. 2 /24 H, preferably 155 g/m 2 /24 H or less, more preferably 150 g/m 2 /24 H or less. By setting the moisture permeability to such a range, the state change (typically, the peeling of the surface protective film and/or the peeling of the release liner) and the curl caused by the change over time can be achieved as described above. The circular polarizer. Furthermore, the lower limit of the moisture permeability of the second protective layer is, for example, 10 g/m. 2 /24 H. The second protective layer is formed of any appropriate film that can be used as a protective layer of the polarizing element as long as it has the above-mentioned moisture permeability. The material for forming the second protective layer is typically an acrylic resin. In one embodiment, a (meth)acrylic resin having a pentacomilin structure is used as the acrylic resin. The (meth)acrylic resin having a pentylene quinone imine structure is disclosed in, for example, Japanese Patent Laid-Open No. Hei. No. 2006-309033, Japanese Patent Laid-Open No. Hei. No. Hei. No. 2006-317560, Japanese Patent Laid-Open No. Hei No. 2006-328329, and Japanese Patent No. Japanese Laid-Open Patent Publication No. 2006-328334, Japanese Patent Laid-Open No. Hei. No. 2006-337491, Japanese Patent Laid-Open No. Hei. No. 2006-337492, Japanese Patent Laid-Open No. Hei. No. 2006-337493, Japanese Patent Laid-Open No. Hei. No. 2006-337569 It is described in Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. 2010-284840, and Japanese Patent Laid-Open No. Hei. No. 2010-284840. These documents are incorporated herein by reference. In another embodiment, a (meth)acrylic resin having a lactone ring structure is used as the acrylic resin. (meth)acrylic resin having a lactone ring structure, for example, Japanese Patent Laid-Open No. 2000-230016, Japanese Patent Laid-Open No. 2001-151814, Japanese Patent Laid-Open Publication No. 2002-120326, and Japanese Patent Laid-Open No. 2002 It is described in Japanese Laid-Open Patent Publication No. 2005-146084. These documents are incorporated herein by reference. The Tg (glass transition temperature) of the (meth)acrylic resin is preferably 115 ° C or higher, more preferably 120 ° C or higher, further preferably 125 ° C or higher, and particularly preferably 130 ° C or higher. The reason for this is that it is excellent in durability. The upper limit of the Tg of the (meth)acrylic resin is not particularly limited, and is preferably 170 ° C or less from the viewpoint of moldability and the like. The mass average molecular weight (also sometimes referred to as weight average molecular weight) of the (meth)acrylic resin is preferably from 1,000 to 2,000,000, more preferably from 5,000 to 1,000,000, still more preferably from 10,000 to 500,000, particularly preferably from 50,000 to 500,000. . The second protective layer 12 is preferably optically isotropic. In the present specification, the term "optical isotropic" means that the in-plane retardation Re (550) is 0 nm to 10 nm, and the phase difference Rth (550) in the thickness direction is -10 nm to +10 nm. The thickness of the second protective layer is, for example, 15 μm to 35 μm, preferably 15 μm to 25 μm. With such a thickness, the desired optical characteristics as the protective layer on the inner side (display unit side) of the polarizing element can be maintained and the above-mentioned moisture permeability can be realized. E. Phase Difference Layer The phase difference layer 30 may have any suitable optical and/or mechanical properties for the purpose. The phase difference layer 30 typically has a slow phase axis. The angle θ formed by the retardation axis of the phase difference layer 30 and the absorption axis of the polarizing element 11 is, as described above, typically 35 to 55, preferably 38 to 52, more preferably 42. It is preferably -45°, more preferably about 45°. When the angle θ is such a range, the retardation layer 30 can be made into a λ/4 plate as follows, and a circularly polarizing plate having excellent circular polarization characteristics (resulting in excellent anti-reflection characteristics) can be obtained. . The retardation layer 30 preferably has a refractive index characteristic exhibiting a relationship of nx>ny≧nz. The phase difference layer is typically provided to impart anti-reflection characteristics to the polarizing plate, and functions as a λ/4 plate. The in-plane retardation Re (550) of the retardation layer is 80 nm to 200 nm as described above, preferably 100 nm to 180 nm, and more preferably 110 nm to 170 nm. Furthermore, here, "ny=nz" includes not only the case where ny and nz are completely equal, but also the case where ny and nz are substantially equal. Therefore, there is a possibility that ny<nz is present within the range in which the effects of the present invention are not impaired. The Nz coefficient of the retardation layer is preferably from 0.9 to 3, more preferably from 0.9 to 2.5, still more preferably from 0.9 to 1.5, particularly preferably from 0.9 to 1.3. By satisfying such a relationship, when the circular polarizing plate to be obtained is used for an image display device, a very excellent reflected hue can be achieved. The phase difference layer can exhibit a reverse wavelength dispersion characteristic in which the phase difference value becomes larger as the wavelength of the measurement light becomes larger, and can also exhibit a positive wavelength dispersion characteristic in which the phase difference value becomes smaller with the wavelength of the measurement light, and can also exhibit a phase difference value. A stable wavelength dispersion characteristic that does not vary with the wavelength of the measured light. In one embodiment, the phase difference layer exhibits inverse wavelength dispersion characteristics. In this case, the Re(450)/Re(550) of the retardation layer is preferably 0.8 or more and less than 1, more preferably 0.8 or more and 0.95 or less. With such a configuration, very excellent anti-reflection characteristics can be achieved. In another embodiment, the phase difference layer exhibits a smooth wavelength dispersion characteristic. In this case, Re (450) / Re (550) of the retardation layer is preferably 0.99 to 1.03, and Re (650) / Re (550) is preferably 0.98 to 1.02. The retardation layer includes an absolute value of the photoelastic coefficient preferably 2 × 10 -11 m 2 /N or less, more preferably 2.0×10 -13 m 2 /N～1.5×10 -11 m 2 /N, and further preferably 1.0 × 10 -12 m 2 /N～1.2×10 -11 m 2 /N resin. When the absolute value of the photoelastic coefficient is in such a range, when a shrinkage stress occurs during heating, a phase difference change is less likely to occur. As a result, heat unevenness of the obtained image display device can be preferably prevented. When the second protective layer 12 is omitted and the phase difference layer 30 also serves as a protective layer of the polarizing element 20 as described above, the moisture permeability of the phase difference layer at 40 ° C and a relative humidity of 92% is less than 160 g as described above. /m 2 /24 H, preferably 120 g/m 2 /24 H or less, more preferably 100 g/m 2 /24 H or less. By setting the moisture permeability to such a range, the state change (typically, the peeling of the surface protective film and/or the peeling of the release liner) and the curl caused by the change over time can be achieved as described above. The circular polarizer. Furthermore, the lower limit of the moisture permeability of the phase difference layer is, for example, 10 g/m. 2 /24 H. The thickness of the retardation layer is preferably 60 μm or less, preferably 30 μm to 58 μm. With such a thickness, the desired optical characteristics of the λ/4 plate imparting a circularly polarizing function can be maintained and the above-mentioned moisture permeability can be realized. The retardation layer 30 can be composed of any suitable resin film capable of satisfying the above characteristics. Typical examples of such a resin include a cycloolefin resin, a polycarbonate resin, a cellulose resin, a polyester resin, a polyvinyl alcohol resin, a polyamine resin, and a polyruthenium. An amine resin, a polyether resin, a polystyrene resin, or an acrylic resin. When the phase difference layer is composed of a resin film exhibiting reverse wavelength dispersion characteristics, a polycarbonate resin can be preferably used, and when the phase difference layer is composed of a resin film exhibiting stable wavelength dispersion characteristics, A cycloolefin type resin can be preferably used. As the polycarbonate resin, any suitable polycarbonate resin can be used as long as the effects of the present invention can be obtained. The polycarbonate resin preferably comprises: a structural unit derived from an oxime dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and a source derived from an alicyclic diol, an alicyclic dimethanol, A structural unit of at least one dihydroxy compound of diethylene glycol, triethylene glycol or polyethylene glycol and a group consisting of alkyl diols or spiro diols. The polycarbonate resin preferably comprises a structural unit derived from a lanthanoid dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, a structural unit derived from an alicyclic dimethanol, and/or derived from a second The structural unit of a diol, a triethylene glycol or a polyethylene glycol is further preferably a structural unit derived from a quinone dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and derived from a diethylene compound. A structural unit of an alcohol, triethylene glycol or polyethylene glycol. The polycarbonate resin may also contain structural units derived from other dihydroxy compounds as needed. In addition, the details of the polycarbonate resin which can be preferably used in the present invention are described in, for example, Japanese Patent Laid-Open No. Hei. No. Hei. It is cited in this specification. In one embodiment, a polycarbonate-based resin containing an oligomeric fluorene structural unit can be used. The polycarbonate-based resin containing the oligomeric fluorene structural unit may, for example, be a resin comprising a structural unit represented by the following formula (1) and/or a structural unit represented by the following formula (2) . [Chemical 1] (In the above formula (1) and the above formula (2), R 5 And R 6 Each is independently a direct bond, a substituted or unsubstituted alkylene group having 1 to 4 carbon atoms (preferably an alkylene group having 2 to 3 carbon atoms in the main chain). R 7 It is a direct bond, a substituted or unsubstituted alkylene group having 1 to 4 carbon atoms (preferably an alkylene group having 1 to 2 carbon atoms in the main chain). R 8 ~R 13 The alkyl group independently substituted by a hydrogen atom, substituted or unsubstituted, having 1 to 10 carbon atoms (preferably 1 to 4, more preferably 1 to 2), substituted or unsubstituted carbon number 4 to 10 ( Preferably, it is an aryl group of 4 to 8, more preferably 4 to 7), a substituted or unsubstituted fluorenyl group having 1 to 10 (preferably 1 to 4, more preferably 1 to 2) carbon atoms. The substituted or unsubstituted alkoxy group having 1 to 10 (preferably 1 to 4, more preferably 1 to 2) carbon atoms, substituted or unsubstituted carbon number 1 to 10 (preferably 1 to 4) More preferably, it is an aryloxy group of 1 to 2), a substituted or unsubstituted carbonoxy group having 1 to 10 carbon atoms (preferably 1 to 4, more preferably 1 to 2), substituted or unsubstituted. Substituted amine group, substituted or unsubstituted carbon number of 1 to 10 (preferably 1 to 4), substituted or unsubstituted carbon number of 1 to 10 (preferably 1 to 4) An ethynyl group, a sulfur atom having a substituent, a halogen atom having a substituent, a halogen atom, a nitro group or a cyano group. R 8 ~R 13 At least two adjacent groups may be bonded to each other to form a ring. In one embodiment, the anthracene ring contained in the oligomeric germanium structural unit has R 8 ~R 13 All of them are composed of hydrogen atoms or have R 8 And / or R 13 Is any one selected from the group consisting of a halogen atom, a fluorenyl group, a nitro group, a cyano group, and a sulfo group, and R 9 ~R 12 It is the composition of a hydrogen atom. The details of the polycarbonate-based resin containing the oligomeric fluorene structural unit are described in, for example, JP-A-2015-212816. The descriptions of these patent documents are incorporated herein by reference. The glass transition temperature of the polycarbonate resin is preferably 110 ° C or more and 150 ° C or less, more preferably 120 ° C or more and 140 ° C or less. When the glass transition temperature is too low, the heat resistance tends to be deteriorated, and the dimensional change may occur after the film formation, and the image quality of the obtained organic EL panel may be deteriorated. If the glass transition temperature is too high, the molding stability at the time of film formation may be deteriorated, and the transparency of the film may be impaired. Further, the glass transition temperature was determined in accordance with JIS K 7121 (1987). The molecular weight of the above polycarbonate resin can be expressed by the specific viscosity. The specific viscosity was determined by using dichloromethane as a solvent, and the polycarbonate concentration was accurately prepared to 0.6 g/dL, and the temperature was measured at 20.0 ° C ± 0.1 ° C using a Ubbelohs viscosity tube. The lower limit of the rich viscosity is usually preferably 0.30 dL/g, more preferably 0.35 dL/g or more. The upper limit of the rich viscosity is usually preferably 1.20 dL/g, more preferably 1.00 dL/g, and still more preferably 0.80 dL/g. When the specific viscosity is less than the above lower limit, there is a problem that the mechanical strength of the molded article becomes small. On the other hand, when the specific viscosity is larger than the above upper limit, there is a problem that the fluidity at the time of molding is lowered and the productivity or moldability is lowered. A commercially available film can also be used as the polycarbonate resin film. As a specific example of the commercial product, the product name "PURE-ACE WR-S", "PURE-ACE WR-W", "PURE-ACE WR-M" manufactured by Teijin Co., Ltd., and Nitto Denko Corporation can be exemplified. The product name is "NRF". The cycloolefin-based resin is a general term for a resin obtained by polymerizing a cyclic olefin as a polymerization unit, and, for example, Japanese Patent Laid-Open No. Hei No. 1-240517, Japanese Patent Laid-Open No. Hei No. Hei No. Hei No. Hei No. Hei No. Hei. The resin described in the publication No. 122137 or the like. As a specific example, a ring-opening (co)polymer of a cycloolefin, an addition polymer of a cycloolefin, a copolymer of a cycloolefin and an α-olefin such as ethylene or propylene (representatively random) may be mentioned. a copolymer) and a graft modified body obtained by modifying the unsaturated carboxylic acid or a derivative thereof, and a hydrogenated product thereof. Specific examples of the cyclic olefin include a olefinic monomer. As the olefinic monomer, for example, exemplified by &lt;158665; olefin and its alkyl and/or alkylene substituent, such as 5-methyl-2-nor &#158665; Alkene, 5-dimethyl-2-northene &lt;158665; alkene, 5-ethyl-2-lower &#158665; alkene, 5-butyl-2-lower &lt;158665; alkene, 5-ethylene -2-降&#158665; alkene, etc., polar substituents such as halo; dicyclopentadiene, 2,3-dihydrodicyclopentadiene, etc.; dimethyl octahydronaphthalene, its alkane Polar and/or alkylene substituents, and polar substituents such as halo, such as 6-methyl-1,4:5,8-dimethyl-1,4,4a,5,6,7,8 , 8a-octahydronaphthalene, 6-ethyl-1,4:5,8-dimethyl-1,4,4a,5,6,7,8,8a-octahydronaphthalene, 6-ethylene- 1,4:5,8-Dimethyl-1,4,4a,5,6,7,8,8a-octahydronaphthalene, 6-chloro-1,4:5,8-dimethyl-1, 4,4a,5,6,7,8,8a-octahydronaphthalene, 6-cyano-1,4:5,8-dimethyl-1,4,4a,5,6,7,8,8a - octahydronaphthalene, 6-pyridyl-1,4:5,8-dimethyl-1,4,4a,5,6,7,8,8a-octahydronaphthalene, 6-methoxycarbonyl-1 , 4:5,8-dimethyl-1,4,4a,5,6,7,8,8a-octahydronaphthalene, etc.; a tetra-tetramer of cyclopentadiene, such as 4, 9:5, 8-Dimethyl-3a,4,4a,5,8,8a,9,9a-octahydro-1H- , 4,11:5,10:6,9-trimethyl-3a,4,4a,5,5a,6,9,9a,10,10a,11,11a-dodecahydro-1H-cyclopenta Hey. In the present invention, other cyclic olefins capable of ring-opening polymerization may be used in combination within the range not impairing the object of the present invention. Specific examples of such a cyclic olefin include, for example, a compound having one reactive double bond such as cyclopentene, cyclooctene or 5,6-dihydrodicyclopentadiene. The number average molecular weight (Mn) of the cycloolefin-based resin measured by gel permeation chromatography (GPC) using a toluene solvent is preferably from 25,000 to 200,000, more preferably from 30,000 to 100,000. The best is 40,000 to 80,000. When the number average molecular weight is in the above range, it is excellent in mechanical strength, solubility, moldability, and casting workability. A commercially available film can also be used as the above cycloolefin-based resin film. As a specific example, the product name "ZEONEX", "ZEONOR" manufactured by Japan's Rayon Company, the product name "Arton" manufactured by JSR, the product name "TOPAS" manufactured by TICONA, and Mitsui Chemicals Co., Ltd. The product name is "APEL". The phase difference layer 30 can be obtained, for example, by extending a film formed of the above resin. As a method of forming a film from a resin, any appropriate forming method can be employed. Specific examples thereof include compression molding, transfer molding, injection molding, extrusion molding, blow molding, powder molding, FRP (Fiber Reinforced Plastics) molding, and casting. Method (for example, casting method), calendering method, hot pressing method, and the like. It is preferably an extrusion molding method or a coating method. The reason for this is that the smoothness of the obtained film can be improved, and good optical uniformity can be obtained. The molding conditions can be appropriately set depending on the composition or type of the resin to be used, the desired characteristics of the retardation layer, and the like. Further, as described above, since a plurality of film products are commercially available as a polycarbonate resin or a cycloolefin resin, the commercially available film may be directly supplied to the stretching treatment. The thickness of the resin film (unstretched film) can be set to any appropriate value depending on the desired thickness of the retardation layer, desired optical characteristics, elongation conditions described below, and the like. It is preferably 50 μm to 300 μm. The above extension may employ any suitable extension method, extension conditions (e.g., elongation temperature, extension ratio, extension direction). Specifically, various extension methods such as free end extension, fixed end extension, free end contraction, and fixed end contraction may be used simultaneously or sequentially. The extending direction can also be performed in various directions or dimensions such as the longitudinal direction, the width direction, the thickness direction, and the oblique direction. In one embodiment, the retardation film is produced by uniaxially stretching a resin film or uniaxially stretching a fixed end of the resin film. As a specific example of the uniaxial stretching of the fixed end, a method in which the resin film is extended in the longitudinal direction (lateral direction) while moving in the longitudinal direction is exemplified. The stretching ratio is preferably from 1.1 to 3.5 times. In another embodiment, the retardation film can be produced by continuously extending the elongated resin film obliquely in the direction of the angle θ with respect to the longitudinal direction. By extending obliquely, an elongated stretch film having an alignment angle (a slow axis in the direction of the angle θ) with respect to the longitudinal direction of the film is obtained, for example, when laminated with a polarizing element. A roll-to-roll approach can simplify manufacturing steps. Furthermore, the angle θ may be an angle formed by the absorption axis of the polarizing element in the circular polarizing plate and the slow phase axis of the phase difference layer. As described above, the angle θ is typically from 35 to 55, preferably from 38 to 52, more preferably from 42 to 48, still more preferably about 45. As the stretching machine for obliquely extending, for example, a tenter type stretching machine capable of adding a feed force or a tensile force or a pulling force having different right and left speeds in the lateral direction and/or the longitudinal direction can be exemplified. The tenter type extender includes a lateral uniaxial stretching machine, a simultaneous biaxial stretching machine, and the like, but any suitable stretching machine can be used as long as the elongated resin film can be continuously extended obliquely. By appropriately controlling the speeds of the left and right in the extension machine, respectively, a phase difference layer having substantially the above-described desired in-plane phase difference and having a slow phase axis in the desired direction can be obtained (substantially strip-shaped phase) Bad film). The extension temperature of the film may vary depending on the in-plane retardation value and thickness desired for the retardation layer, the kind of the resin to be used, the thickness of the film to be used, the stretching ratio, and the like. Specifically, the stretching temperature is preferably from Tg -30 ° C to Tg + 60 ° C, more preferably from Tg -15 ° C to Tg + 55 ° C, most preferably from Tg - 10 ° C to Tg + 50 ° C. By extending at such a temperature, the first retardation layer having appropriate characteristics in the present invention can be obtained. Further, the glass transition temperature of the constituent material of the Tg film. A retardation film having the above-described desired optical characteristics (for example, refractive index characteristics, in-plane retardation, and Nz coefficient) can be obtained by appropriately selecting the above-described stretching method and stretching conditions. F. Conductive layer or isotropic substrate conductive layer with conductive layer can be any suitable film forming method (such as vacuum evaporation, sputtering, CVD (Chemical Vapor Deposition), ion A plating method, a spray method, or the like) is formed by forming a metal oxide film on any appropriate substrate. 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. Among them, indium-tin composite oxide (ITO) is preferred. 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 conductive layer may be transferred from the substrate to the retardation layer, and the conductive layer may be used alone as a constituent layer of the circularly polarizing plate, or may be laminated to the phase difference layer in the form of a laminate (base material with a conductive layer) of the substrate. The above substrate is preferably optically isotropic, and therefore, the conductive layer can be used as a circularly polarizing plate as an isotropic substrate with a conductive layer. As the optically isotropic substrate (isotropic substrate), any suitable isotropic substrate can be used. The material constituting the isotropic substrate may, for example, be a material having a conjugated resin such as an olefin resin or an olefin resin as a main skeleton, and may be in the main chain of the acrylic resin. A material having a cyclic structure such as a lactone ring or a glutarimide ring. When such a material is used, when an 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 isotropic substrate is preferably 50 μm or less, more preferably 35 μm or less. The lower limit of the thickness of the isotropic substrate is, for example, 20 μm. The conductive layer and/or the conductive layer of the isotropic substrate with the conductive layer may be patterned as needed. The conductive portion and the insulating portion can be formed by patterning. As a result, an electrode can be formed. The electrodes function as touch sensor electrodes that sense the contact of the touch panel. As the patterning method, any appropriate method can be employed. Specific examples of the patterning method include a wet etching method and a screen printing method. G. Image Display Device The circularly polarizing plate described in the above items A to F can be applied to a flexible image display device. Accordingly, the present invention encompasses a flexible image display device using such a circular polarizing plate. As a representative example of the flexible image display device, an organic EL display device can be exemplified. The flexible image display device according to the embodiment of the present invention includes the circularly polarizing plate described in the above items A to F on the viewing side. The circularly polarizing plate is laminated such that the retardation layer is on the side of the display unit (for example, the organic EL unit) (the polarizing element is on the viewing side). The flexible organic EL display device can be realized, for example, by forming a substrate of an organic EL unit using a flexible or foldable material. Typical examples of such a material include a thin glass, a thermoplastic resin, a thermosetting resin film, an alloy, and a metal which are provided with flexibility. Examples of the thermoplastic resin or the thermosetting resin include a polyester resin, a polyimide resin, an epoxy resin, a polyurethane resin, a polystyrene resin, and a polyolefin. A resin, a polyamide resin, a polycarbonate resin, an anthrone resin, a fluorine resin, or an acrylonitrile-butadiene-styrene copolymer resin. As the alloy, for example, stainless steel, 36 alloy, or 42 alloy can be exemplified. As the metal, for example, copper, nickel, iron, aluminum, or titanium can be exemplified. The configuration of the organic EL display device is well known in the art, and thus detailed description thereof will be omitted. Further, the details of the flexible or foldable organic EL display device are described in, for example, Patent No. 4,601,463 or Patent No. 4,707,996. These documents are incorporated herein by reference. 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 digital micrometer (KC-351C manufactured by Anritsu Co., Ltd.). (2) The phase difference value of the phase difference layer is the refractive index of the phase difference layer used in the examples and the comparative examples by an automatic birefringence measuring device (manufactured by Oji Scientific Instruments Co., Ltd., automatic birefringence meter KOBRA-WPR) Nx, ny, and nz were measured. The measurement wavelength of the in-plane retardation Re was 450 nm and 550 nm, and the measurement wavelength of the thickness direction phase difference Rth was 550 nm, and the measurement temperature was 23 °C. (3) Moisture permeability The film constituting the second protective layer or the retardation layer was measured in accordance with JIS Z 0208 (cup method). (4) Curl amount For the circularly polarizing plates obtained in the examples and the comparative examples, (i) the state in which the release liner and the surface protective film were temporarily adhered, and (ii) the release liner was peeled off but temporarily adhered. The state of the surface protective film and (iii) the state in which the release liner and the surface protective film are both removed and removed, are placed in an environment of 25 ° C ± 5 ° C and a clean room (relative humidity 55% ± 10%). The amount of curl in the case of an hour is measured. Specifically, on the base where no static electricity is generated, the circular polarizing plate is allowed to stand in contact with the pedestal at the center portion thereof, and after 72 hours, the warpage of the circular polarizing plate is measured by a steel angle gauge, and the four corners are measured. The highest one in warpage is set to the amount of curl. Further, the case where the circular polarizing plate is warped toward the first protective layer side (hard coat layer side) is set to "positive", and the case where the second protective layer side (adhesive layer side) is warped is set to "negative" . When the amount of curl is within ±6 mm, it is set to "good", and the case where the amount of curl is more than 6 mm is set to "poor". [Reference Example 1: Preparation of Polarizing Plate] A long roll of a polyvinyl alcohol (PVA) resin film (manufactured by Kuraray Co., Ltd., product name "PE6000") having a thickness of 60 μm was used as a long strip by a roll stretching machine. In the 5.9-fold direction, the uniaxial stretching was performed in the longitudinal direction, and the swelling, dyeing, cross-linking, and washing treatment were simultaneously performed, and finally, the drying treatment was performed, whereby the polarizing element 1 having a thickness of 22 μm was produced. Specifically, the swelling treatment was extended to 2.2 times while being treated in pure water at 20 °C. Then, the dyeing treatment was carried out in an aqueous solution of 30 ° C in which the weight ratio of iodine to potassium iodide at a weight ratio of 1:7 was adjusted to 1.4 in a manner that the monomer transmittance of the obtained polarizing element was 45.0%. Times. Further, the cross-linking treatment was carried out by a two-stage cross-linking treatment, and the cross-linking treatment in the first stage was extended to 1.2 times while being treated in an aqueous solution of boric acid and potassium iodide dissolved at 40 °C. 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 cross-linking treatment was extended to 1.6 times while being treated in an aqueous solution of boric acid and potassium iodide dissolved at 65 °C. The boric acid content of the aqueous solution of the second stage crosslinking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight. Further, the washing treatment was carried out in an aqueous solution of potassium iodide 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 carried out by drying at 70 ° C for 5 minutes to obtain a polarizing element 1. a methacrylic resin film having a glutaryleneimine ring structure (thickness: 20 μm, corresponding to the second protective layer) is bonded to both surfaces of the obtained polarizing element 1 via a polyvinyl alcohol-based adhesive. The HC-TAC film (thickness: 47 μm, corresponding to the first protective layer) having a hard coat (HC) layer formed by hard coating treatment on one side of the TAC film, and having the first protective layer/polarizing element 1/ The polarizing plate 1 of the second protective layer. Further, a methacrylic resin film having a glutarylenediamine ring structure was produced in the following manner. The methacrylic resin particles having a pentamethyleneimine ring structure were dried at 100.5 kPa and 100 ° C for 12 hours, and extruded from a T-die at a die temperature of 270 ° C using a uniaxial extruder to form a film. shape. The obtained film is stretched in an conveying direction (MD) in an environment of 10 ° C higher than the glass transition temperature Tg of the resin, and then in a direction orthogonal to the conveying direction (TD), in comparison with the above resin The elongation was carried out in an environment where the glass transition temperature Tg was 7 ° C higher. The film obtained exhibits substantial optical isotropy. [Reference Example 2: Production of Polarizing Plate] A long roll of a polyvinyl alcohol (PVA) resin film (manufactured by Kuraray, product name "PE3000") having a thickness of 30 μm was used in a strip direction by a roll stretching machine. In a manner of 5.9 times, the uniaxial stretching was performed in the longitudinal direction, and the swelling, dyeing, crosslinking, and washing treatment were simultaneously performed, and finally, the drying treatment was performed, whereby the polarizing element 2 having a thickness of 12 μm was produced. An HC-PC film having a hard coat (HC) layer formed by hard coating treatment on one surface of the polycarbonate resin film is bonded to one surface of the obtained polarizing element 2 via a polyvinyl alcohol-based adhesive ( The thickness: 25 μm corresponds to the first protective layer), and the polarizing plate 2 having the configuration of the first protective layer/polarizing element 2 is obtained. [Reference Example 3: Preparation of Polarizing Plate] The TAC film manufactured by Konica Minolta Co., Ltd. was bonded to both sides of the polarizing element 2 obtained in Reference Example 2 via a polyvinyl alcohol-based adhesive (product name: KC2UA, thickness) : 25 μm (corresponding to the second protective layer) and an HC-TAC film having a hard coat (HC) layer formed by hard coating on one side of the TAC film (thickness: 32 μm, corresponding to the first protective layer) The polarizing plate 3 having the first protective layer/polarizing element 2/second protective layer is obtained. [Reference Example 4: Preparation of polarizing plate] The first protection was obtained in the same manner as in Reference Example 1 except that a TAC film (product name: KC2CT1, thickness: 20 μm) manufactured by Konica Minolta Co., Ltd. was used as the second protective layer. A polarizing plate 4 composed of a layer/polarizing element 1 and a second protective layer. [Reference Example 5: Production of Polarizing Plate] A long roll of a polyvinyl alcohol (PVA) resin film (manufactured by Kuraray, product name "PE6000") having a thickness of 60 μm was used in a strip direction by a roll stretching machine. In a manner of 5.9 times, the uniaxial stretching was carried out in the longitudinal direction, and the swelling, dyeing, cross-linking, and washing treatment were simultaneously performed, and finally, the drying treatment was performed, whereby the polarizing element 3 having a thickness of 23 μm was produced. On one side of the obtained polarizing element 3, a low-reflection TAC film having a hard coat (HC) layer formed by low-reflection hard coating treatment on one side of the TAC film is bonded via a polyvinyl alcohol-based adhesive (thickness: 71 μm, corresponding to the first protective layer, manufactured by Dainippon Printing Co., Ltd., product name "DSG-03HL", to obtain a polarizing plate 5 having the configuration of the first protective layer/polarizing element 3. [Reference Example 6: Preparation of retardation film constituting the retardation layer] 1. Preparation of polycarbonate resin film 26.2 parts by mass of isosorbide (ISB), 100.5 parts by mass of 9,9-[4-(2) -Hydroxyethoxy)phenyl]indole (BHEPF), 10.7 parts by mass of 1,4-cyclohexanedimethanol (1,4-CHDM), 105.1 parts by mass of diphenyl carbonate (DPC), and 0.591 parts by mass The cesium carbonate (0.2% by mass aqueous solution) as a catalyst was separately supplied to the reaction vessel, and in the first step of the reaction under a nitrogen atmosphere, the temperature of the heat medium in the reaction vessel was 150 ° C, and the mixture was stirred as needed. The raw material is dissolved on one side (about 15 minutes). Then, the pressure in the reaction vessel was set to 13.3 kPa from the normal pressure, and the temperature of the heat medium in the reaction vessel was raised to 190 ° C for 1 hour, and the generated phenol was taken out to the outside of the reaction vessel. After maintaining the temperature in the reaction vessel at 190 ° C for 15 minutes, the pressure in the reaction vessel was set to 6.67 kPa as a second step, and the temperature of the heat medium in the reaction vessel was raised to 230 ° C over 15 minutes, and was produced. The phenol is pumped out of the reaction vessel. Since the stirring torque of the stirrer increased, the temperature was raised to 250 ° C over 8 minutes, and in order to remove the generated phenol, the pressure in the reaction vessel was reduced to 0.200 kPa or less. After the specific stirring torque is reached, the reaction is terminated, and the resulting reactant is extruded into water to be granulated to obtain BHEPF/ISB/1,4-CHDM=47.4 mol%/37.1 mol%/ 15.5 mol% of polycarbonate resin. The polycarbonate resin obtained had a glass transition temperature of 136.6 ° C and a specific viscosity of 0.395 dL/g. The obtained polycarbonate resin was vacuum dried at 80 ° C for 5 hours, and then used with a uniaxial extruder (manufactured by Isuzu Chemical Machinery Co., Ltd., screw diameter 25 mm, cylinder set temperature: 220 ° C), T-shaped mold ( A film forming apparatus having a width of 200 mm, a set temperature of 220 ° C), a cooling roll (setting temperature: 120 to 130 ° C), and a coiler was used to produce a polycarbonate resin film having a thickness of 120 μm. 2. Preparation of retardation film The obtained polycarbonate resin film was laterally stretched using a tenter stretching machine to obtain a retardation film having a thickness of 50 μm. At this time, the stretching ratio was 250%, and the stretching temperature was 137 to 139 °C. The obtained retardation film has a Re (550) of 137 to 147 nm, a Re (450) / Re (550) of 0.89, an Nz coefficient of 1.21, and an alignment angle (direction of the slow phase axis) of 90 with respect to the strip direction. °. This retardation film was used as the phase difference layer 1. [Reference Example 7: Preparation of retardation film constituting the retardation layer] A retardation film having a thickness of 55 μm was obtained in the same manner as in Reference Example 6, except that a polycarbonate resin film having a thickness of 140 μm was produced. The retardation film obtained had a Re (550) of 147 nm, a Re (450)/Re (550) of 0.89, an Nz coefficient of 1.21, and an alignment angle (direction of the slow phase axis) of 90° with respect to the strip direction. This retardation film is used as the phase difference layer 2. [Reference Example 8: Preparation of retardation film constituting the retardation layer] 1. Preparation of polycarbonate resin film 38.06 parts by weight (0.059 mol) of bis[9-(2-phenoxycarbonylmethyl)fluorene- 9-yl]methane, 53.73 parts by weight (0.368 mol) of isosorbide (manufactured by Roquette Freres, trade name "POLYSORB"), 9.64 parts by weight (0.067 mol) of 1,4-cyclohexanedimethanol (cis Formula, trans mixture, manufactured by SK Chemical Co., Ltd., 81.28 parts by weight (0.379 mol) of diphenyl carbonate (manufactured by Mitsubishi Chemical Corporation) and 3.83×10 -4 Parts by weight (2.17×10) -6 Calcium acetate monohydrate as a catalyst is charged into the reaction vessel, and the inside of the reaction apparatus is subjected to a reduced pressure nitrogen replacement. The raw material was dissolved while stirring at 150 ° C for about 10 minutes in a nitrogen atmosphere. As a first step of the reaction, the temperature was raised to 220 ° C over 30 minutes and reacted under normal pressure for 60 minutes. Then, the pressure was reduced from normal pressure to 13.3 kPa over 90 minutes, and held at 13.3 kPa for 30 minutes, and the produced phenol was taken out of the reaction system. Then, as a second step of the reaction, while the temperature of the heat medium was raised to 240 ° C over 15 minutes, the pressure was reduced to 0.10 kPa or less over 15 minutes, and the produced phenol was taken out of the reaction system. After a specific stirring torque is reached, the pressure is stopped by atmospheric pressure to a normal pressure and the reaction is stopped, the produced polyester carbonate is extruded into water, and the strand is cut to obtain polycarbonate resin pellets. 2. Preparation of retardation film A film made of the above polycarbonate resin particles was obliquely stretched to obtain a retardation film having a thickness of 58 μm. At this time, the extending direction was set to 45° with respect to the longitudinal direction of the film. Further, the stretching ratio was adjusted to 2 to 3 times so that the retardation film exhibited a phase difference of λ/4. Further, the extension temperature was set to 148 ° C (that is, Tg + 5 ° C of the unstretched modified polycarbonate film). The retardation film obtained has a Re(550) of 141 nm, a Re(450)/Re(550) of 0.83, an Nz coefficient of 1.1, and a photoelastic coefficient of 16×10. -12 Pa, the alignment angle (the direction of the slow phase axis) is 45° with respect to the strip direction. This retardation film is used as the phase difference layer 3. [Example 1] The second protective layer of the polarizing plate 1 and the retardation layer 1 were bonded via an acrylic adhesive so that the angle formed by the absorption axis of the polarizing element and the retardation axis of the retardation layer was 45°. A circular polarizing plate 1 was obtained. An acrylic adhesive layer (thickness 15 μm) was provided on the phase difference layer of the obtained circular polarizing plate 1, and a release liner was temporarily adhered to the surface of the adhesive layer. Further, the surface protective film is temporarily adhered to the first protective layer. The protective film was applied to a PET film having a thickness of 38 μm and coated with an adhesive having a thickness of 10 μm. Furthermore, the second protective layer has a moisture permeability of 150 g/m at 40 ° C and a relative humidity of 92%. 2 /24 H. The obtained circular polarizing plate 1 was supplied to the evaluation of the amount of curling of the above (4). The results are shown in Table 1. Further, the organic EL unit was taken out from a flexible organic EL display device (manufactured by Samsung, trade name "Galaxy S6 Edge"). On the other hand, the release liner is peeled off from the circularly polarizing plate 1, and the circularly polarizing plate 1 is bonded to the organic EL unit via an adhesive layer. Further, the surface protective film was peeled off from the circularly polarizing plate bonded to the organic EL unit. The organic EL unit to which the circularly polarizing plate 1 was bonded was allowed to stand under conditions of 23 ° C and 55% RH for 72 hours, and visually observed for warpage. As a result, warpage and bending did not occur. [Example 2] The polarizing element surface of the polarizing plate 2 and the retardation layer 2 were bonded via a PVA-based adhesive so that the angle formed by the absorption axis of the polarizing element and the retardation axis of the retardation layer was 45°. A circular polarizing plate 2 was obtained. An acrylic adhesive layer (thickness 15 μm) was provided on the phase difference layer of the obtained circular polarizing plate 2, and a release liner was temporarily adhered to the surface of the adhesive layer. Further, the surface protective film is temporarily adhered to the first protective layer. Furthermore, the phase difference layer has a moisture permeability of 70 g/m at 40 ° C and a relative humidity of 92%. 2 /24 H. The obtained circular polarizing plate 2 was supplied to the evaluation of the amount of crimping of the above (4). The results are shown in Table 1. Further, in the same manner as in Example 1, the obtained circular polarizing plate 2 was bonded to an organic EL unit, and the same evaluation as in Example 1 was carried out. As a result, warpage and bending did not occur. [Example 3] The surface of the polarizing element of the polarizing plate 5 and the retardation layer 3 were bonded via a PVA-based adhesive so that the angle formed by the absorption axis of the polarizing element and the slow axis of the retardation layer was 45°. A circular polarizing plate 5 is obtained. An acrylic adhesive layer (thickness: 20 μm) was provided on the phase difference layer of the obtained circular polarizing plate 5, and a release liner was temporarily adhered to the surface of the adhesive layer. Further, the surface protective film is temporarily adhered to the first protective layer. Furthermore, the phase difference layer has a moisture permeability of 80 g/m at 40 ° C and a relative humidity of 92%. 2 /24 H. The obtained circular polarizing plate 5 was supplied to the evaluation of the amount of curling of the above (4). The results are shown in Table 1. Further, in the same manner as in Example 1, the obtained circularly polarizing plate 5 was bonded to an organic EL unit, and the same evaluation as in Example 1 was carried out. As a result, warpage and bending did not occur. [Comparative Example 1] The surface of the polarizing element of the polarizing plate 3 and the retardation layer 1 were bonded via an acrylic adhesive so that the angle formed by the absorption axis of the polarizing element and the retardation axis of the retardation layer was 45°. A circular polarizing plate 3 was obtained. An acrylic adhesive layer (thickness 15 μm) was provided on the phase difference layer of the obtained circular polarizing plate 3, and a release liner was temporarily adhered to the surface of the adhesive layer. Further, the surface protective film is temporarily adhered to the first protective layer. Furthermore, the second protective layer has a moisture permeability of 1000 g/m at 40 ° C and a relative humidity of 92%. 2 /24 H. The obtained circular polarizing plate 3 was supplied to the evaluation of the amount of crimping of the above (4). The results are shown in Table 1. Further, in the same manner as in Example 1, the obtained circularly polarizing plate 3 was bonded to an organic EL unit, and the same evaluation as in Example 1 was carried out. As a result, warpage was confirmed. [Comparative Example 2] The surface of the polarizing element of the polarizing plate 4 and the retardation layer 1 were bonded via an acrylic adhesive so that the angle formed by the absorption axis of the polarizing element and the slow axis of the retardation layer was 45°. A circular polarizing plate 4 is obtained. An acrylic adhesive layer (thickness 15 μm) was provided on the phase difference layer of the obtained circular polarizing plate 4, and a release liner was temporarily adhered to the surface of the adhesive layer. Further, the surface protective film is temporarily adhered to the first protective layer. Furthermore, the second protective layer has a moisture permeability of 1500 g/m at 40 ° C and a relative humidity of 92%. 2 /24 H. The obtained circular polarizing plate 4 was supplied to the evaluation of the amount of crimping of the above (4). The results are shown in Table 1. Further, in the same manner as in Example 1, the obtained circular polarizing plate 4 was bonded to an organic EL unit, and the same evaluation as in Example 1 was carried out. As a result, warpage was confirmed. [Table 1] <Evaluation> As is apparent from Table 1, the circular polarizing plate of the embodiment of the present invention has a small amount of curl due to a change with time in a state where the release liner and the surface protective film are peeled off. As a result, it was confirmed that the bending or warpage of the image display device itself can be preferably suppressed in the case of being applied to the flexible image display device. [Industrial Applicability] The circularly polarizing plate of the present invention can be preferably used for a flexible image display device (for example, an organic EL display device).

11‧‧‧第1保護層
12‧‧‧第2保護層
20‧‧‧偏光元件
30‧‧‧相位差層
40‧‧‧硬塗層
50‧‧‧黏著劑層
60‧‧‧剝離襯墊
70‧‧‧表面保護膜
100‧‧‧圓偏光板11‧‧‧1st protective layer
12‧‧‧2nd protective layer
20‧‧‧Polarized elements
30‧‧‧ phase difference layer
40‧‧‧hard coating
50‧‧‧Adhesive layer
60‧‧‧Release liner
70‧‧‧Surface protection film
100‧‧‧round polarizing plate

圖1係本發明之一實施形態之圓偏光板之概略剖視圖。Fig. 1 is a schematic cross-sectional view showing a circularly polarizing plate according to an embodiment of the present invention.

11‧‧‧第1保護層 11‧‧‧1st protective layer

12‧‧‧第2保護層 12‧‧‧2nd protective layer

20‧‧‧偏光元件 20‧‧‧Polarized elements

30‧‧‧相位差層 30‧‧‧ phase difference layer

40‧‧‧硬塗層 40‧‧‧hard coating

50‧‧‧黏著劑層 50‧‧‧Adhesive layer

60‧‧‧剝離襯墊 60‧‧‧Release liner

70‧‧‧表面保護膜 70‧‧‧Surface protection film

100‧‧‧圓偏光板 100‧‧‧round polarizing plate

Claims (9)

一種圓偏光板， 其依序具有第1保護層、偏光元件、第2保護層及面內相位差Re(550)為80 nm～200 nm之相位差層，且 該第2保護層於40℃、相對濕度92%下之透濕度未達160 g/m2 /24 H， 該圓偏光板被用於可撓性圖像顯示裝置。A circular polarizing plate having a first protective layer, a polarizing element, a second protective layer, and a retardation layer having an in-plane retardation Re (550) of 80 nm to 200 nm in this order, and the second protective layer is at 40 ° C The moisture permeability at a relative humidity of 92% was less than 160 g/m 2 /24 H, and the circular polarizing plate was used for a flexible image display device. 如請求項1之圓偏光板，其中上述第2保護層被省略而上述相位差層兼作上述偏光元件之保護層，且該相位差層於40℃、相對濕度92%下之透濕度未達160 g/m2 /24 H。The circular polarizing plate of claim 1, wherein the second protective layer is omitted and the phase difference layer also serves as a protective layer of the polarizing element, and the phase difference layer has a moisture permeability of less than 160 at 40 ° C and a relative humidity of 92%. g/m 2 /24 H. 如請求項1或2之圓偏光板，其中上述偏光元件之吸收軸與上述相位差層之遲相軸所成之角度θ為35°～55°。The circular polarizing plate of claim 1 or 2, wherein an angle θ between an absorption axis of the polarizing element and a late phase axis of the phase difference layer is 35° to 55°. 如請求項1或2之圓偏光板，其進而於上述第1保護層之外側具有硬塗層。The circularly polarizing plate of claim 1 or 2 further comprising a hard coat layer on the outer side of the first protective layer. 如請求項1或2之圓偏光板，其進而於上述相位差層側之最外部具有黏著劑層，且於該黏著劑層表面暫時黏有剝離襯墊。The circular polarizing plate of claim 1 or 2 further comprising an adhesive layer on the outermost side of the phase difference layer side, and a release liner is temporarily adhered to the surface of the adhesive layer. 如請求項1或2之圓偏光板，其中於上述第1保護層側之最外部暫時黏有表面保護膜。The circularly polarizing plate of claim 1 or 2, wherein a surface protective film is temporarily adhered to the outermost side of the first protective layer side. 如請求項5之圓偏光板，其中於暫時黏有上述剝離襯墊及上述表面保護膜之狀態、該剝離襯墊被剝離去除但暫時黏有該表面保護膜之狀態以及該剝離襯墊及該表面保護膜均被剝離去除之狀態之各狀態下，在25℃±5℃、相對濕度55%±10%之環境下放置72小時，於該情形時之捲曲量為±6 mm以內。The circular polarizing plate of claim 5, wherein the release liner and the surface protection film are temporarily adhered, the release liner is peeled off but temporarily adhered to the surface protective film, and the release liner and the release liner In each state in which the surface protective film was peeled off, it was allowed to stand in an environment of 25 ° C ± 5 ° C and a relative humidity of 55% ± 10% for 72 hours, and the curl amount in this case was within ± 6 mm. 如請求項6之圓偏光板，其中於暫時黏有上述剝離襯墊及上述表面保護膜之狀態、該剝離襯墊被剝離去除但暫時黏有該表面保護膜之狀態以及該剝離襯墊及該表面保護膜均被剝離去除之狀態之各狀態下，在25℃±5℃、相對濕度55%±10%之環境下72放置小時，於該情形時之捲曲量為±6 mm以內。The circularly polarizing plate of claim 6, wherein the release liner and the surface protection film are temporarily adhered, the release liner is peeled off but temporarily adhered to the surface protective film, and the release liner and the release liner In each state in which the surface protective film is peeled off, it is left in an environment of 25 ° C ± 5 ° C and a relative humidity of 55% ± 10% for 72 hours, and the curl amount in this case is within ± 6 mm. 一種可撓性圖像顯示裝置，其具備如請求項1至8中任一項之圓偏光板。A flexible image display device comprising the circularly polarizing plate according to any one of claims 1 to 8.
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