TW201805664A

TW201805664A - Optical member and liquid crystal display device

Info

Publication number: TW201805664A
Application number: TW106122657A
Authority: TW
Inventors: 淵田岳仁; 麓弘明; 高田勝則; 北村吉紹
Original assignee: 日東電工股份有限公司
Priority date: 2016-07-08
Filing date: 2017-07-06
Publication date: 2018-02-16
Also published as: JP2018013774A

Abstract

Provided is an optical member which makes it possible to prevent reductions to visibility that occur when a liquid crystal display device having a protective cover is viewed through polarized sunglasses. This optical member is provided with, in order, a polarizing film, a high retardation layer, and a protective cover. The in-plane retardation of the high retardation layer is 3000 nm to 30000 nm, the angle formed by the slow axis of the high retardation layer and the absorption axis of the polarizing film is 40 DEG to 50 DEG, and the in-plane retardation of the protective cover is no more than 7000 nm.

Description

Optical member and liquid crystal display device

本發明係關於一種光學構件、及具有光學構件之液晶顯示裝置。The present invention relates to an optical member and a liquid crystal display device having the same.

為了降低陽光刺眼之環境下之眩光，使用具有偏光特性之太陽眼鏡(偏光太陽眼鏡)。然而，於在戴上偏光太陽眼鏡之狀態下視認液晶顯示裝置之情形時，液晶顯示裝置之顯示光因觀察者之姿勢而有時被偏光太陽眼鏡吸收，視認性降低。於專利文獻1中記載有一種視認性改善方法，其係使用白色發光二極體作為液晶顯示裝置之背光源，並且以偏光元件之吸收軸與高分子膜之遲相軸所成之角大致成為45°的方式將具有3000～30000 nm之延遲之高分子膜配置於偏光元件之觀察者側而使用。根據專利文獻1之視認性改善方法，可改善通過偏光太陽眼鏡觀察畫面時之視認性。 [先前技術文獻] [專利文獻] 專利文獻1：日本專利特開2011-215646號公報In order to reduce glare in a sun-dazzling environment, use polarized sunglasses (polarized sunglasses). However, when the liquid crystal display device is visually recognized while wearing polarized sunglasses, the display light of the liquid crystal display device is sometimes absorbed by the polarized sunglasses due to the posture of the observer, resulting in reduced visibility. Patent Document 1 describes a method for improving visibility, which uses a white light-emitting diode as a backlight of a liquid crystal display device, and an angle formed by an absorption axis of a polarizing element and a late phase axis of a polymer film is approximately At 45 °, a polymer film with a retardation of 3000 to 30,000 nm is arranged on the observer side of the polarizing element and used. According to the visibility improvement method of Patent Document 1, the visibility when observing a screen through polarized sunglasses can be improved. [Prior Art Document] [Patent Document] Patent Document 1: Japanese Patent Laid-Open No. 2011-215646

[發明所欲解決之問題] 例如，搭載於汽車導航系統之液晶顯示裝置係顯示面板經塑膠等透明之保護蓋覆蓋。於將專利文獻1之視認性改善方法中所使用之高分子膜應用於汽車導航系統用液晶顯示裝置之情形時，有受到保護蓋之光學特性之影響而視認性降低之情形。本發明係鑒於上述問題而完成者，其目的在於提供一種可抑制通過偏光太陽眼鏡視認附保護蓋之液晶顯示裝置時之視認性之降低的光學構件。 [解決問題之技術手段] 本發明之光學構件依序具有偏光膜、高相位差層及保護蓋，上述高相位差層之面內相位差為3000 nm～30000 nm，上述高相位差層之遲相軸與上述偏光膜之吸收軸所成之角度為40°～50°，上述保護蓋之面內相位差為7000 nm以下。於一個實施形態中，上述保護蓋之面內相位差為1000 nm以下。於一個實施形態中，上述保護蓋之遲相軸與上述偏光膜之吸收軸所成之角度為-5°～5°或85°～95°。於一個實施形態中，上述保護蓋之遲相軸與上述偏光膜之吸收軸所成之角度為40°～50°，上述保護蓋之遲相軸與上述高相位差層之遲相軸所成之角度為-5°～5°或85°～95°。於一個實施形態中，上述保護蓋之厚度為1000 μm以上。於一個實施形態中，於將上述保護蓋之藉由ASTM-D790之彎曲試驗方法獲得之彎曲強度設為S(kgf/cm² )，將上述保護蓋之厚度設為T(mm)時，S×T之值為400以上。於一個實施形態中，於上述保護蓋與上述高相位差層之間填充有黏著劑。於一個實施形態中，於上述保護蓋之與上述偏光膜相反之一側積層有抗反射膜。本發明之液晶顯示裝置具備上述光學構件。 [發明之效果] 根據本發明，可抑制通過偏光太陽眼鏡視認附保護蓋之液晶顯示裝置時之視認性之降低。[Problems to be Solved by the Invention] For example, a liquid crystal display device mounted on a car navigation system is a display panel covered with a transparent protective cover such as plastic. When the polymer film used in the visibility improvement method of Patent Document 1 is applied to a liquid crystal display device for a car navigation system, the visibility may be affected by the optical characteristics of the protective cover. The present invention has been made in view of the above problems, and an object thereof is to provide an optical member capable of suppressing a decrease in visibility when a liquid crystal display device with a protective cover is viewed through polarized sunglasses. [Technical means to solve the problem] The optical member of the present invention has a polarizing film, a high retardation layer, and a protective cover in order. The in-plane phase difference of the high retardation layer is 3000 nm to 30,000 nm, and the retardation of the high retardation layer is delayed. The angle formed between the phase axis and the absorption axis of the polarizing film is 40 ° to 50 °, and the in-plane phase difference of the protective cover is 7000 nm or less. In one embodiment, the in-plane phase difference of the protective cover is 1000 nm or less. In one embodiment, the angle formed by the late phase axis of the protective cover and the absorption axis of the polarizing film is -5 ° to 5 ° or 85 ° to 95 °. In one embodiment, the angle formed by the late phase axis of the protective cover and the absorption axis of the polarizing film is 40 ° -50 °, and the late phase axis of the protective cover and the late phase axis of the high retardation layer are formed. The angle is -5 ° to 5 ° or 85 ° to 95 °. In one embodiment, the thickness of the protective cover is 1000 μm or more. In one embodiment, when the bending strength of the protective cover obtained by the bending test method of ASTM-D790 is S (kgf / cm ² ), and when the thickness of the protective cover is T (mm), S The value of × T is 400 or more. In one embodiment, an adhesive is filled between the protective cover and the high retardation layer. In one embodiment, an anti-reflection film is laminated on one side of the protective cover opposite to the polarizing film. A liquid crystal display device of the present invention includes the above-mentioned optical member. [Effects of the Invention] According to the present invention, it is possible to suppress a decrease in visibility when the liquid crystal display device with a protective cover is viewed through polarized sunglasses.

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。 (用語及記號之定義) 於本說明書中，所謂「面內相位差」係23℃下之於波長550 nm之光下所測得之層(膜)之面內的相位差，於將層(膜)之厚度設為d(nm)時，藉由式：Re＝(nx－ny)×d求出。此處，「nx」係面內之折射率達到最大之方向(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」係設為厚度方向之折射率。 A.光學構件圖1係本發明之一個實施形態之光學構件之剖視圖。如圖1所示，光學構件10依序具有偏光膜1、高相位差層2及保護蓋3，偏光膜1與高相位差層2係經由黏著劑4而貼合。高相位差層2之面內相位差為3000 nm～30000 nm，保護蓋3之面內相位差為7000 nm以下，高相位差層2之遲相軸與偏光膜1之吸收軸所成之角度為40°～50°。本發明之光學構件10可搭載於液晶顯示裝置。藉由將光學構件10設置於液晶顯示裝置之液晶單元之視認者側，可提昇通過偏光太陽眼鏡觀察液晶顯示裝置之顯示畫面時之視認性。具體而言，可抑制正面亮度之降低、及與視角對應之色相之變化(色移)。圖2係本發明之另一實施形態之光學構件之剖視圖。圖2所示之光學構件11具有經由層間填充黏著劑5將高相位差層2與保護蓋3貼合之構造。圖3係本發明之又一實施形態之光學構件之剖視圖。如圖3所示之光學構件12般，亦可於保護蓋3之視認者側設置抗反射膜6。作為抗反射膜6，可採用業界通常使用之抗反射膜，例如可採用具有包含中折射率材料之層、包含高折射率材料之層、及包含低折射率材料之層之多層膜。 B.偏光膜偏光膜1具有偏光元件與保護層之積層構造。具體而言，於偏光膜1、高相位差層2及保護蓋3之積層構造中，可於偏光元件之保護蓋3側設置保護層(未圖示)。又，亦可於偏光元件之與保護蓋3相反之一側具備另一保護層(未圖示：以下亦稱為內側保護層)。 B-1.偏光元件作為偏光元件，可採用任意之適當之偏光元件。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。作為包含單層之樹脂膜之偏光元件之具體例，可列舉：對聚乙烯醇(PVA)系膜、部分縮甲醛化PVA系膜、乙烯-乙酸乙烯酯共聚物系部分皂化膜等親水性高分子膜實施利用碘或二色性染料等二色性物質之染色處理及延伸處理而成者；PVA之脫水處理物或聚氯乙烯之脫鹽酸處理物等多烯系配向膜等。就光學特性優異之方面而言，較佳為使用利用將對PVA系膜染色並進行單軸延伸而獲得之偏光元件。上述利用碘之染色例如係藉由將PVA系膜浸漬於碘水溶液中而進行。上述單軸延伸之延伸倍率較佳為3～7倍。延伸可於染色處理後進行，亦可一面進行染色一面進行。又，亦可進行延伸後進行染色。視需要對PVA系膜實施膨潤處理、交聯處理、清洗處理、乾燥處理等。例如藉由在染色之前將PVA系膜浸漬於水中進行水洗，不僅可清洗PVA系膜表面之污垢或抗黏連劑，而且可使PVA系膜膨潤而防止染色不均等。作為使用積層體而獲得之偏光元件之具體例，可列舉：使用樹脂基材與積層於該樹脂基材上之PVA系樹脂層(PVA系樹脂膜)之積層體、或樹脂基材與塗佈形成於該樹脂基材上之PVA系樹脂層之積層體而獲得之偏光元件。使用樹脂基材與塗佈形成於該樹脂基材上之PVA系樹脂層之積層體而獲得之偏光元件例如可藉由如下操作而製作：將PVA系樹脂溶液塗佈於樹脂基材上，使其乾燥而於樹脂基材上形成PVA系樹脂層，獲得樹脂基材與PVA系樹脂層之積層體；對該積層體進行延伸及染色而將PVA系樹脂層製成偏光元件。於本實施形態中，延伸具代表性而言包括使積層體浸漬於硼酸水溶液中並進行延伸之操作。進而，延伸視需要可進而包括於硼酸水溶液中之延伸之前對積層體於高溫(例如95℃以上)下進行空中延伸之操作。所獲得之樹脂基材/偏光元件之積層體可直接使用(即，可將樹脂基材作為偏光元件之保護層)，亦可自樹脂基材/偏光元件之積層體剝離樹脂基材，於該剝離面上積層與目的對應之任意之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係記載於日本專利特開2012-73580號公報中。將該公報之全部記載以參考之方式引用至本說明書中。偏光元件之厚度具代表性而言為1 μm～80 μm。偏光元件之厚度之上限較佳為50 μm，更佳為35 μm，尤佳為30 μm。偏光元件之厚度之下限較佳為1 μm，更佳為3 μm。若偏光元件之厚度為此種範圍，則可良好地抑制加熱時之捲曲，且可獲得良好之加熱時之外觀耐久性。 B-2.保護層上述保護層係藉由可用作偏光元件之保護層的任意之適當之膜而形成。作為成為該膜之主成分的材料之具體例，可列舉：三乙醯纖維素(TAC)等纖維素系樹脂；或聚酯系、聚乙烯醇系、聚碳酸酯系、聚醯胺系、聚醯亞胺系、聚醚碸系、聚碸系、聚苯乙烯系、聚降𦯉烯系、聚烯烴系、(甲基)丙烯酸系、乙酸酯系等之透明樹脂等。又，亦可列舉(甲基)丙烯酸系、胺基甲酸酯系、(甲基)丙烯酸胺基甲酸酯系、環氧系、聚矽氧系等之熱硬化型樹脂或紫外線硬化型樹脂等。除此以外，例如亦可列舉矽氧烷系聚合物等玻璃質系聚合物。又，亦可使用日本專利特開2001-343529號公報(WO01/37007)中記載之聚合物膜。作為該膜之材料，例如可使用含有於側鏈中具有經取代或未經取代之醯亞胺基之熱塑性樹脂、及於側鏈中具有經取代或未經取代之苯基以及腈基之熱塑性樹脂的樹脂組合物，例如可列舉含有包含異丁烯及N-甲基順丁烯二醯亞胺之交替共聚物、及丙烯腈-苯乙烯共聚物之樹脂組合物。該聚合物膜例如可為上述樹脂組合物之擠出成形物。視需要可對保護層實施硬塗處理、抗反射處理、抗沾黏處理、防眩處理等表面處理。進而/或者，視需要可對保護層實施改善經由偏光太陽眼鏡進行視認之情形時之視認性的處理(具代表性而言為賦予(橢)圓偏光功能，賦予超高相位差)。藉由實施此種處理，可提昇經由偏光太陽眼鏡視認搭載有光學構件10之液晶顯示裝置之顯示畫面時之視認性。保護層之厚度具代表性而言為5 mm以下，較佳為1 mm以下，更佳為1 μm～500 μm，進而較佳為5 μm～150 μm。再者，於實施表面處理之情形時，保護層之厚度係包括表面處理層之厚度在內之厚度。內側保護層較佳為就光學方面而言為各向同性。於本說明書中，所謂「就光學方面而言為各向同性」係指面內相位差Re(550)為0 nm～10 nm，厚度方向之相位差Rth(550)為-10 nm～+10 nm。內側保護層只要就光學方面而言為各向同性，則可包含任意之適當之材料。該材料例如可自上文中關於保護層所敍述之材料中適當地選擇。內側保護層之厚度較佳為5 μm～200 μm，更佳為10 μm～100 μm，進而較佳為15 μm～95 μm。 C.黏著劑作為黏著劑4，可採用任意之適當之黏著劑。黏著劑4具代表性而言係藉由丙烯酸系黏著劑所形成。 D.高相位差層高相位差層2包含具有雙折射性之透明材料。高相位差層2之面內相位差為3000 nm以上且30000 nm以下，更佳為10000 nm以上。又，高相位差層2之厚度為任意，較佳為25 μm～500 μm，更佳為35 μm～350 μm。高相位差層2之遲相軸與偏光膜1之吸收軸所成之角度較佳為40°～50°，更佳為42°～48°，尤佳為約45°。藉由將具備上述高相位差層2之光學構件10設置於液晶顯示裝置，可抑制通過偏光太陽眼鏡視認液晶顯示裝置之情形時之亮度降低及虹不均。高相位差層2可由任意之適當之材料形成。作為上述材料，可列舉：聚對苯二甲酸乙二酯或聚萘二甲酸乙二酯等聚酯、聚碳酸酯、聚苯乙烯、聚醚醚酮、聚苯硫醚、環烯烴聚合物。尤其以聚對苯二甲酸乙二酯為代表之聚酯由於固有雙折射較大，即便厚度較薄亦可相對容易地獲得較大之面內相位差，故而可較佳地使用。 E.保護蓋保護蓋3包含具有雙折射性之透明之塑膠材料。保護蓋3之面內相位差為7000 nm以下。保護蓋3之面內相位差之上限較佳為5000 nm，更佳為3000 nm，尤佳為1000 nm。保護蓋3之面內相位差大於0 nm。藉此，可於通過偏光太陽眼鏡視認搭載有上述保護蓋3之液晶顯示裝置之情形時，抑制因設置高相位差層2所引起之色移之產生。保護蓋3之遲相軸與偏光膜1之吸收軸所成之角度並無特別限定。保護蓋3之遲相軸與偏光膜1之吸收軸所成之角度具代表性而言，實質上為0°，實質上為45°，或者實質上為90°。具體而言，保護蓋3之遲相軸與偏光膜1之吸收軸所成之角度較佳為-5°～5°、40°～50°或85°～95°，更佳為-3°～3°、42°～48°或87°～93°，尤佳為約0°、約45°或約90°。於保護蓋3之遲相軸與偏光膜1之吸收軸所成之角度實質上為45°的情形時，保護蓋3之遲相軸與高相位差層2之遲相軸所成之角度實質上為0°或者實質上為90°。具體而言，保護蓋3之遲相軸與偏光膜1之吸收軸所成之角度較佳為-5°～5°或85°～95°，更佳為-3°～3°或87°～93°，尤佳為約0°或約90°。保護蓋3之厚度較佳為1000 μm以上，更佳為2000 μm以上。藉由將保護蓋3之厚度設為1000 μm以上，可於將光學構件10設置於液晶顯示裝置之液晶單元之視認者側時，實現為了保護液晶單元所必需之機械強度。又，保護蓋3之厚度較佳為4000 μm以下。藉此，可使液晶顯示裝置小型化，並且亦可將保護蓋3應用於附觸控面板之液晶顯示裝置。於將保護蓋之彎曲強度設為S(kgf/cm² )，將保護蓋之厚度設為T(mm)時，表示保護蓋之強度之S×T之值較佳為400以上，更佳為500以上，進而較佳為600以上。另一方面，S×T之上限值較佳為4000，更佳為2000。保護蓋之彎曲強度可依據ASTM-D790之彎曲試驗方法進行測定。作為構成保護蓋3之材料，可採用任意之適當之材料。作為上述材料，可使用聚碳酸酯樹脂、聚甲基丙烯酸甲酯樹脂等。保護蓋3可如圖1所示般不空出間隙而貼合於偏光膜1，亦可於與偏光膜1之間空出間隙而設置。於一個實施形態中，高相位差層2之面內相位差為3000 nm～30000 nm，高相位差層2之遲相軸與偏光膜1之吸收軸所成之角度為40°～50°，且保護蓋3之面內相位差為7000 nm以下。藉此，藉由將光學構件10設置於液晶顯示裝置之液晶單元之視認者側，可抑制通過偏光太陽眼鏡視認液晶顯示裝置之情形時之視認性之降低。具體而言，可抑制正面亮度之降低、及與視角對應之色相之變化(色移)。 F.層間填充黏著劑作為層間填充黏著劑5，可採用任意之適當之黏著劑。例如，層間填充黏著劑5可為包含丙烯酸系聚合物之丙烯酸系黏著劑。層間填充黏著劑5中之丙烯酸系聚合物之含量並無特別限定，就臭氣之觀點而言，較佳為96重量%～100重量%，更佳為98重量%～100重量%。上述丙烯酸系聚合物較佳為以具有直鏈或分支鏈狀之烷基的(甲基)丙烯酸烷基酯及/或(甲基)丙烯酸烷氧基烷基酯作為必需之單體成分(monomer component)而構成的丙烯酸系聚合物。作為層間填充黏著劑5之具體構成，較佳為包含如下丙烯酸系聚合物之丙烯酸系黏著劑層，該丙烯酸系聚合物包含相對於構成丙烯酸系聚合物之單體成分總量(100重量%)，含有丙烯酸2-乙基己酯(2EHA)84～94重量%、丙烯酸(AA)5～15重量%、二季戊四醇六丙烯酸酯(DPHA)0.03～0.15重量%之單體成分。又，作為層間填充黏著劑5之其他具體構成，較佳為包含如下丙烯酸系聚合物之丙烯酸系黏著劑層，該丙烯酸系聚合物包含相對於構成丙烯酸系聚合物之單體成分總量(100重量%)，含有丙烯酸異辛酯(i-OA)84～94重量%、丙烯酸(AA)5～15重量%、二季戊四醇六丙烯酸酯(DPHA)0.03～0.15重量%之單體成分。層間填充黏著劑5之厚度較佳為25 μm～500 μm，更佳為75 μm～350 μm。層間填充黏著劑5對保護蓋3之23℃下之180°剝離黏著力(稱為「黏著力(23℃)」)較佳為5 N/20 mm以上，更佳為8 N/20 mm以上。藉由將黏著力(23℃)設為5 N/20 mm以上，而抑制延遲氣泡(隨時間經過出現於與保護蓋之界面之氣泡)之產生。再者，上述黏著力(23℃)可藉由在23℃下進行以保護蓋作為被黏著體之180°剝離試驗(依據JIS Z0237(2000)，拉伸速度：300 mm/分鐘)而測定。關於此種層間填充黏著劑之詳細內容，例如係於日本專利特開2012-153788號公報中以黏著劑層之形式進行記載。將該公報之全部記載以參考之方式引用至本說明書中。 G.液晶顯示裝置上述A項至F項中記載之光學構件可應用於液晶顯示裝置。因此，本發明包含使用此種光學構件之液晶顯示裝置。本發明之實施形態之液晶顯示裝置具備液晶單元、及配置於該液晶單元之視認側之上述A項至F中記載之光學構件。光學構件係以偏光膜成為液晶單元側之方式配置。 [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。＜實施例1＞ 1.偏光板之製作針對厚度80 μm之聚乙烯醇膜，於速度比不同之輥間，於30℃下一面於0.3%濃度之碘溶液中染色1分鐘，一面延伸至3倍。其後，於60℃下一面於包含4%濃度之硼酸、10%濃度之碘化鉀之水溶液中浸漬0.5分鐘一面延伸至綜合延伸倍率為6倍。繼而，藉由在30℃下於包含1.5%濃度之碘化鉀之水溶液中浸漬10秒而進行清洗後，於50℃下進行4分鐘乾燥而獲得偏光元件。藉由聚乙烯醇系接著劑將經皂化處理之厚度80 μm之三乙醯纖維素膜貼合於該偏光元件之兩面，製作偏光板(偏光膜)。 2.光學構件之製作作為保護蓋，使用面內相位差為877 nm且包含聚碳酸酯樹脂之厚度1500 μm之塑膠蓋(三菱瓦斯化學公司製造，製品名「NF2000」)。又，作為高相位差層，使用面內相位差為8400 nm且包含聚對苯二甲酸乙二酯樹脂之厚度80 μm之高相位差膜(東洋紡織公司製造，製品名「Cosmoshine SRF」)。經由丙烯酸系黏著劑，將上述高相位差膜與上述偏光板以高相位差膜之遲相軸與偏光板之吸收軸所成之角度θ成為45°的方式貼合。進而，針對上述高相位差膜，經由層間填充黏著劑(日東電工公司製造，製品名「CS9864」)，將上述塑膠蓋以塑膠蓋之遲相軸與偏光板之吸收軸所成之角度θ成為0°的方式貼合，藉此獲得光學構件。於將依據ASTM-D790之彎曲試驗方法所測得之上述保護蓋之彎曲強度設為S(kgf/cm² )，將保護蓋之厚度設為T(mm)時，保護蓋之強度(S×T)為1425。＜實施例2＞作為保護蓋，使用面內相位差為461 nm且包含聚碳酸酯樹脂之厚度2000 μm之塑膠蓋(帝人公司製造，製品名「PC1151」)，除此以外，以與實施例1相同之方式獲得光學構件。於將依據ASTM-D790之彎曲試驗方法所測得之上述保護蓋之彎曲強度設為S(kgf/cm² )，將保護蓋之厚度設為T(mm)時，保護蓋之強度(S×T)為1900。＜實施例3＞作為保護蓋，使用面內相位差為0.4 nm且包含聚甲基丙烯酸甲酯樹脂之厚度1500 μm之塑膠蓋(三菱麗陽公司製造，製品名「MR200」)，除此以外，以與實施例1相同之方式獲得光學構件。於將依據ASTM-D790之彎曲試驗方法所測得之上述保護蓋之彎曲強度設為S(kgf/cm² )，將保護蓋之厚度設為T(mm)時，保護蓋之強度(S×T)為1425。＜實施例4＞作為保護蓋，使用面內相位差為112.4 nm且包含聚甲基丙烯酸甲酯樹脂/聚碳酸酯樹脂/聚甲基丙烯酸甲酯樹脂之積層構造之厚度1500 μm之塑膠蓋(可樂麗公司製造，製品名「MT3LTR」)，除此以外，以與實施例1相同之方式獲得光學構件。於將依據ASTM-D790之彎曲試驗方法所測得之上述保護蓋之彎曲強度設為S(kgf/cm² )，將保護蓋之厚度設為T(mm)時，保護蓋之強度(S×T)為1425。＜比較例1＞作為保護蓋，使用面內相位差為7605 nm且包含聚甲基丙烯酸甲酯樹脂與聚碳酸酯樹脂之積層構造之厚度1450 μm之塑膠蓋(三菱瓦斯化學公司製造，製品名「HMR551T」)，除此以外，以與實施例1相同之方式獲得光學構件。於將依據ASTM-D790之彎曲試驗方法所測得之上述保護蓋之彎曲強度設為S(kgf/cm² )，將保護蓋之厚度設為T(mm)時，保護蓋之強度(S×T)為1377。＜比較例2＞不使用高相位差膜及黏著劑，經由層間填充黏著劑將偏光板與塑膠蓋貼合，除此以外，以與實施例1相同之方式獲得光學構件。＜比較例3＞不使用高相位差膜及黏著劑，經由層間填充黏著劑將偏光板與塑膠蓋貼合，除此以外，以與實施例2相同之方式獲得光學構件。＜比較例4＞不使用高相位差膜及黏著劑，經由層間填充黏著劑將偏光板與塑膠蓋貼合，除此以外，以與實施例3相同之方式獲得光學構件。＜比較例5＞不使用高相位差膜及黏著劑，經由層間填充黏著劑將偏光板與塑膠蓋貼合，除此以外，以與實施例4相同之方式獲得光學構件。＜比較例6＞不使用高相位差膜及黏著劑，經由層間填充黏著劑將偏光板與塑膠蓋貼合，除此以外，以與比較例1相同之方式獲得光學構件。針對實施例1～4及比較例1～6之光學構件，如以下般評價通過偏光太陽眼鏡觀察具備各光學構件之液晶顯示裝置時之正面亮度及色移。 (1)正面亮度之測定方法將ITEC公司之LED面光源「LPDC1-12150NCW-1R6」配置於光學構件之背面側(偏光板側)，將設想為偏光太陽眼鏡之偏光板配置於光學構件之前面側(塑膠蓋側)，使用ConoScope(AUTRONIC MELCHERS股份有限公司製造)，經由光學構件及偏光板測定光源之亮度(單位：cd/m² )。再者，偏光板係以其偏光元件之吸收軸與光學構件之偏光元件之吸收軸正交的方式配置。 (2)色移之測定方法以與正面亮度之測定相同之方式配置光源、光學構件及偏光板，使用ConoScope(AUTRONIC MELCHERS股份有限公司製造)，測定極角0°～60°方向之方位角0°～360°之色相、x值及y值。作為色移量(Δxy值)，將任意2點處之x值及y值設為(x_A ，y_A )及(x_B ，y_B )，將下式：{(x_A －x_B )² ＋(y_A －y_B )² }^1/2 之最大值作為Δxy值。再者，偏光板係以其偏光元件之吸收軸與光學構件之偏光元件之吸收軸正交的方式配置。將實施例1～4及比較例1之光學構件之正面亮度及色移之測定結果示於表1，將比較例2～6之光學構件之正面亮度及色移之測定結果示於表2。再者，於表1及表2中，作為色移之測定結果，示出xy色度圖(橫軸：x值，縱軸：y值)及色移量(Δxy值)。 [表1]

[表2]

[產業上之可利用性] 本發明之光學構件可較佳地用於搭載於行動電話、攜帶型資訊終端、數位相機、攝錄影機、可攜式遊戲機、汽車導航、影印機、印表機、傳真、鐘錶、微波爐等之液晶顯示裝置。Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these embodiments. (Definition of terms and symbols) In this specification, the so-called "in-plane phase difference" refers to the in-plane phase difference of a layer (film) measured under light at a wavelength of 550 nm at 23 ° C. When the thickness of the film) is d (nm), it can be obtained by the formula: Re = (nx−ny) × d. Here, "nx" is the refractive index in the direction where the refractive index in the plane reaches the maximum (that is, the direction of the late phase axis), and "ny" is the direction in the plane that is orthogonal to the late phase axis (the direction of the phase axis) The refractive index, "nz" is a refractive index in the thickness direction. A. Optical Component FIG. 1 is a cross-sectional view of an optical component according to an embodiment of the present invention. As shown in FIG. 1, the optical member 10 has a polarizing film 1, a high retardation layer 2, and a protective cover 3 in this order. The polarizing film 1 and the high retardation layer 2 are bonded together via an adhesive 4. The in-plane phase difference of the high retardation layer 2 is 3000 nm to 30,000 nm, the in-plane phase difference of the protective cover 3 is less than 7000 nm, and the angle formed by the late phase axis of the high retardation layer 2 and the absorption axis of the polarizing film 1 It is 40 ° to 50 °. The optical member 10 of the present invention can be mounted on a liquid crystal display device. By disposing the optical member 10 on the viewer side of the liquid crystal cell of the liquid crystal display device, the visibility when the display screen of the liquid crystal display device is observed through polarized sunglasses can be improved. Specifically, it is possible to suppress a decrease in frontal brightness and a change in hue (color shift) corresponding to a viewing angle. Fig. 2 is a sectional view of an optical member according to another embodiment of the present invention. The optical member 11 shown in FIG. 2 has a structure in which the high retardation layer 2 and the protective cover 3 are bonded together via an interlayer filling adhesive 5. 3 is a cross-sectional view of an optical member according to another embodiment of the present invention. As the optical member 12 shown in FIG. 3, an anti-reflection film 6 may be provided on the viewer side of the protective cover 3. As the anti-reflection film 6, an anti-reflection film commonly used in the industry can be adopted, and for example, a multilayer film having a layer including a medium refractive index material, a layer including a high refractive index material, and a layer including a low refractive index material can be used. B. Polarizing Film The polarizing film 1 has a laminated structure of a polarizing element and a protective layer. Specifically, in the laminated structure of the polarizing film 1, the high retardation layer 2, and the protective cover 3, a protective layer (not shown) may be provided on the protective cover 3 side of the polarizing element. In addition, another protective layer (not shown: hereinafter also referred to as an inner protective layer) may be provided on the side of the polarizing element opposite to the protective cover 3. B-1. Polarizer As the polarizer, any appropriate polarizer can be used. For example, the resin film forming the polarizing element may be a single-layer resin film or a laminated body of two or more layers. Specific examples of the polarizing element including a single-layer resin film include a polyvinyl alcohol (PVA) -based film, a partially formalized PVA-based film, and an ethylene-vinyl acetate copolymer-based partially saponified film. The molecular film is made by dyeing and extending treatment with a dichroic substance such as iodine or a dichroic dye; a polyene-based alignment film such as a dehydrated product of PVA or a dehydrochlorinated product of polyvinyl chloride. In terms of excellent optical characteristics, it is preferable to use a polarizing element obtained by dyeing a PVA-based film and uniaxially stretching it. The dyeing using iodine is performed, for example, by immersing a PVA-based film in an iodine aqueous solution. The stretching ratio of the uniaxial stretching is preferably 3 to 7 times. The stretching may be performed after the dyeing treatment, or may be performed while dyeing. Alternatively, dyeing may be performed after stretching. The PVA-based film is subjected to a swelling treatment, a crosslinking treatment, a washing treatment, a drying treatment, and the like, as necessary. For example, by immersing the PVA-based film in water and washing it before dyeing, not only the dirt or anti-blocking agent on the surface of the PVA-based film can be cleaned, but also the PVA-based film can be swelled to prevent uneven dyeing. Specific examples of the polarizing element obtained by using a laminate include a laminate using a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a resin substrate and coating A polarizing element obtained by forming a laminated body of a PVA-based resin layer on the resin substrate. A polarizing element obtained by using a laminate of a resin substrate and a PVA-based resin layer formed on the resin substrate can be produced, for example, by applying a PVA-based resin solution to the resin substrate, It is dried to form a PVA-based resin layer on a resin substrate to obtain a laminated body of the resin substrate and the PVA-based resin layer; the laminated body is stretched and dyed to make the PVA-based resin layer into a polarizing element. In this embodiment, the stretching typically includes an operation in which the laminate is immersed in an aqueous boric acid solution and stretched. Further, if necessary, the stretching may further include performing an aerial stretching operation on the laminate at a high temperature (for example, 95 ° C. or higher) before the stretching in the boric acid aqueous solution. The obtained resin substrate / polarizing element laminated body can be used directly (that is, the resin substrate can be used as a protective layer of the polarizing element), or the resin substrate can be peeled from the resin substrate / polarizing element laminated body. Any appropriate protective layer corresponding to the purpose is laminated on the peeling surface and used. The details of the method of manufacturing such a polarizer are described in, for example, Japanese Patent Laid-Open No. 2012-73580. The entire contents of this publication are incorporated herein by reference. The thickness of the polarizing element is typically 1 μm to 80 μm. The upper limit of the thickness of the polarizing element is preferably 50 μm, more preferably 35 μm, and even more preferably 30 μm. The lower limit of the thickness of the polarizing element is preferably 1 μm, and more preferably 3 μm. When the thickness of the polarizing element is in such a range, curling during heating can be well suppressed, and good appearance durability during heating can be obtained. B-2. Protective layer The protective layer is formed by any appropriate film that can be used as a protective layer of a polarizing element. Specific examples of the material that is the main component of the film include cellulose-based resins such as triacetyl cellulose (TAC); or polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, Transparent resins such as polyimide-based, polyether fluorene-based, polyfluorene-based, polystyrene-based, polyphenylene-based, polyolefin-based, (meth) acrylic-based, and acetate-based transparent resins. In addition, thermosetting resins such as (meth) acrylic, urethane, urethane, (meth) acrylic, epoxy, and silicone-based resins or ultraviolet curable resins can also be mentioned. Wait. Other examples include glassy polymers such as siloxane polymers. In addition, a polymer film described in Japanese Patent Laid-Open No. 2001-343529 (WO01 / 37007) may be used. As the material of the film, for example, a thermoplastic resin having a substituted or unsubstituted fluorene imine group in a side chain, and a thermoplastic having a substituted or unsubstituted phenyl group and a nitrile group in a side chain can be used. Examples of the resin composition of the resin include a resin composition containing an alternating copolymer containing isobutylene and N-methylcis butylene diimide, and an acrylonitrile-styrene copolymer. The polymer film may be, for example, an extruded product of the resin composition. If necessary, the protective layer may be subjected to surface treatments such as hard coating treatment, anti-reflection treatment, anti-sticking treatment, and anti-glare treatment. Furthermore, if necessary, the protective layer may be subjected to a process for improving the visibility when viewed through polarized sunglasses (typically, it is provided with an (ellipsoidal) circularly polarized function and an ultra-high phase difference). By performing such processing, the visibility when the display screen of the liquid crystal display device on which the optical member 10 is mounted through the polarized sunglasses is visually recognized can be improved. The thickness of the protective layer is typically 5 mm or less, preferably 1 mm or less, more preferably 1 μm to 500 μm, and still more preferably 5 μm to 150 μm. When the surface treatment is performed, the thickness of the protective layer includes the thickness of the surface treatment layer. The inner protective layer is preferably optically isotropic. In this specification, the term "isotropic in terms of optics" means that the in-plane retardation Re (550) is 0 nm to 10 nm, and the retardation Rth (550) in the thickness direction is -10 nm to +10. nm. The inner protective layer may include any appropriate material as long as it is optically isotropic. The material can be appropriately selected, for example, from the materials described above with respect to the protective layer. The thickness of the inner protective layer is preferably 5 μm to 200 μm, more preferably 10 μm to 100 μm, and even more preferably 15 μm to 95 μm. C. Adhesive As the adhesive 4, any appropriate adhesive can be used. The adhesive 4 is typically formed by an acrylic adhesive. D. High retardation layer The high retardation layer 2 includes a transparent material having birefringence. The in-plane phase difference of the high retardation layer 2 is 3,000 nm or more and 30,000 nm or less, and more preferably 10,000 nm or more. The thickness of the high retardation layer 2 is arbitrary, preferably 25 μm to 500 μm, and more preferably 35 μm to 350 μm. The angle formed by the retardation axis of the high retardation layer 2 and the absorption axis of the polarizing film 1 is preferably 40 ° to 50 °, more preferably 42 ° to 48 °, and even more preferably about 45 °. By providing the optical member 10 provided with the high retardation layer 2 in a liquid crystal display device, it is possible to suppress a decrease in brightness and rainbow unevenness when the liquid crystal display device is viewed through polarized sunglasses. The high retardation layer 2 may be formed of any appropriate material. Examples of the material include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polycarbonates, polystyrene, polyetheretherketone, polyphenylene sulfide, and cycloolefin polymers. In particular, polyester represented by polyethylene terephthalate can be preferably used because of its relatively large birefringence, and relatively large in-plane retardation can be obtained relatively easily even with a small thickness. E. Protective cover The protective cover 3 comprises a transparent plastic material having birefringence. The in-plane phase difference of the protective cover 3 is 7000 nm or less. The upper limit of the in-plane phase difference of the protective cover 3 is preferably 5000 nm, more preferably 3000 nm, and even more preferably 1000 nm. The in-plane phase difference of the protective cover 3 is greater than 0 nm. Accordingly, when the liquid crystal display device equipped with the protective cover 3 is visually recognized through polarized sunglasses, the occurrence of color shift caused by the provision of the high retardation layer 2 can be suppressed. The angle formed by the late phase axis of the protective cover 3 and the absorption axis of the polarizing film 1 is not particularly limited. The angle formed by the late phase axis of the protective cover 3 and the absorption axis of the polarizing film 1 is typically 0 °, 45 °, or 90 °. Specifically, the angle formed by the late phase axis of the protective cover 3 and the absorption axis of the polarizing film 1 is preferably -5 ° to 5 °, 40 ° to 50 °, or 85 ° to 95 °, and more preferably -3 °. ~ 3 °, 42 ° ~ 48 °, or 87 ° ~ 93 °, particularly preferably about 0 °, about 45 °, or about 90 °. When the angle formed by the late phase axis of the protective cover 3 and the absorption axis of the polarizing film 1 is substantially 45 °, the angle formed by the late phase axis of the protective cover 3 and the late phase axis of the high retardation layer 2 is substantially It is 0 ° or substantially 90 °. Specifically, the angle formed by the late phase axis of the protective cover 3 and the absorption axis of the polarizing film 1 is preferably -5 ° to 5 ° or 85 ° to 95 °, and more preferably -3 ° to 3 ° or 87 °. ~ 93 °, particularly preferably about 0 ° or about 90 °. The thickness of the protective cover 3 is preferably 1,000 μm or more, and more preferably 2000 μm or more. By setting the thickness of the protective cover 3 to 1000 μm or more, the mechanical strength necessary for protecting the liquid crystal cell can be achieved when the optical member 10 is set on the viewer side of the liquid crystal cell of the liquid crystal display device. The thickness of the protective cover 3 is preferably 4000 μm or less. Thereby, the liquid crystal display device can be miniaturized, and the protective cover 3 can also be applied to a liquid crystal display device with a touch panel. When the bending strength of the protective cover is set to S (kgf / cm ² ) and the thickness of the protective cover is set to T (mm), the value of S × T indicating the strength of the protective cover is preferably 400 or more, more preferably 500 or more, and more preferably 600 or more. On the other hand, the upper limit of S × T is preferably 4000, and more preferably 2000. The bending strength of the protective cover can be measured according to the bending test method of ASTM-D790. As a material constituting the protective cover 3, any appropriate material can be adopted. As the material, a polycarbonate resin, a polymethyl methacrylate resin, or the like can be used. The protective cover 3 may be attached to the polarizing film 1 without leaving a gap as shown in FIG. 1, or may be provided with a gap between the protective cover 3 and the polarizing film 1. In one embodiment, the in-plane phase difference between the high retardation layer 2 is 3000 nm to 30,000 nm, and the angle formed by the late phase axis of the high retardation layer 2 and the absorption axis of the polarizing film 1 is 40 ° to 50 °. In addition, the in-plane phase difference of the protective cover 3 is 7000 nm or less. Accordingly, by disposing the optical member 10 on the viewer side of the liquid crystal cell of the liquid crystal display device, it is possible to suppress a decrease in visibility when the liquid crystal display device is viewed through polarized sunglasses. Specifically, it is possible to suppress a decrease in frontal brightness and a change in hue (color shift) corresponding to a viewing angle. F. Interlayer Filling Adhesive As the interlayer filling adhesive 5, any appropriate adhesive can be used. For example, the interlayer filling adhesive 5 may be an acrylic adhesive including an acrylic polymer. The content of the acrylic polymer in the interlayer filling adhesive 5 is not particularly limited. From the viewpoint of odor, it is preferably 96% by weight to 100% by weight, and more preferably 98% by weight to 100% by weight. The acrylic polymer is preferably a (meth) acrylic acid alkyl ester having a linear or branched alkyl group and / or (meth) acrylic acid alkoxyalkyl ester as essential monomer components (monomer component). As a specific configuration of the interlayer filling adhesive 5, an acrylic adhesive layer containing an acrylic polymer containing the total amount of monomer components (100% by weight) with respect to the acrylic polymer constituting the acrylic polymer is preferable. Contains monomer components of 84 to 94% by weight of 2-ethylhexyl acrylate (2EHA), 5 to 15% by weight of acrylic acid (AA), and 0.03 to 0.15% by weight of dipentaerythritol hexaacrylate (DPHA). As another specific configuration of the interlayer filling adhesive 5, it is preferable that the acrylic adhesive layer includes an acrylic polymer including the total amount of monomer components (100 % By weight), containing monomer components of 84-94% by weight of isooctyl acrylate (i-OA), 5-15% by weight of acrylic acid (AA), and 0.03-0.15% by weight of dipentaerythritol hexaacrylate (DPHA). The thickness of the interlayer filling adhesive 5 is preferably 25 μm to 500 μm, and more preferably 75 μm to 350 μm. The 180 ° peeling adhesive force (referred to as “adhesive force (23 ° C)”) at 23 ° C of the protective cover 3 between the interlayer filling adhesive 5 and the protective cover 3 is preferably 5 N / 20 mm or more, more preferably 8 N / 20 mm or more . By setting the adhesive force (23 ° C) to 5 N / 20 mm or more, the generation of delayed bubbles (bubbles appearing at the interface with the protective cover over time) is suppressed. The adhesive force (23 ° C) can be measured by a 180 ° peel test (in accordance with JIS Z0237 (2000), tensile speed: 300 mm / min) using a protective cover as an adherend at 23 ° C. The details of such an interlayer filling adhesive are described in the form of an adhesive layer in, for example, Japanese Patent Laid-Open No. 2012-153788. The entire contents of this publication are incorporated herein by reference. G. Liquid crystal display device The optical members described in the above items A to F can be applied to a liquid crystal display device. Therefore, the present invention includes a liquid crystal display device using such an optical member. A liquid crystal display device according to an embodiment of the present invention includes a liquid crystal cell and the optical members described in the above items A to F arranged on the viewing side of the liquid crystal cell. The optical member is arrange | positioned so that a polarizing film may become a liquid crystal cell side. [Examples] Hereinafter, the present invention will be specifically described by examples, but the present invention is not limited to these examples. 〈Example 1〉 1. Production of polarizing plate For a polyvinyl alcohol film with a thickness of 80 μm, it was dyed in a 0.3% concentration iodine solution at a temperature of 30 ° C for 1 minute between rollers with different speed ratios, and extended to 3 on one side. Times. Thereafter, it was immersed in an aqueous solution containing boric acid at a concentration of 4% and potassium iodide at a concentration of 4% at 60 ° C for 0.5 minutes while extending to a comprehensive extension ratio of 6 times. Then, it was immersed in an aqueous solution containing potassium iodide having a concentration of 1.5% at 30 ° C. for 10 seconds to perform cleaning, and then dried at 50 ° C. for 4 minutes to obtain a polarizing element. A saponification-treated triethylammonium cellulose film having a thickness of 80 μm was attached to both sides of the polarizing element with a polyvinyl alcohol-based adhesive to produce a polarizing plate (polarizing film). 2. Fabrication of optical components As a protective cover, a plastic cover (manufactured by Mitsubishi Gas Chemical Company, product name "NF2000") with a phase difference of 877 nm and a polycarbonate resin thickness of 1500 μm is used. As the high retardation layer, a high retardation film (manufactured by Toyobo Co., Ltd., product name "Cosmoshine SRF") having an in-plane retardation of 8400 nm and a thickness of 80 μm including a polyethylene terephthalate resin was used. Via the acrylic adhesive, the high retardation film and the polarizing plate were bonded so that the angle θ formed by the late phase axis of the high retardation film and the absorption axis of the polarizing plate was 45 °. Furthermore, the high retardation film is filled with an adhesive (manufactured by Nitto Denko Corporation, product name "CS9864") between the layers, and the angle θ formed by the plastic lens with the plastic lens's late phase axis and the polarizer's absorption axis is By attaching at 0 °, an optical member is obtained. When the bending strength of the protective cover measured by the bending test method according to ASTM-D790 is S (kgf / cm ² ), and the thickness of the protective cover is T (mm), the strength of the protective cover (S × T) is 1425. <Example 2> As a protective cover, a plastic cover (manufactured by Teijin Corporation, product name "PC1151") with a phase difference of 461 nm and a polycarbonate resin thickness of 2000 μm was used. 1 Obtain an optical member in the same manner. When the bending strength of the protective cover measured by the bending test method according to ASTM-D790 is S (kgf / cm ² ), and the thickness of the protective cover is T (mm), the strength of the protective cover (S × T) is 1900. <Example 3> As a protective cover, a plastic cover with a retardation of 0.4 nm and a thickness of 1500 μm containing polymethyl methacrylate resin (manufactured by Mitsubishi Rayon Corporation, product name "MR200") was used as the protective cover. An optical member was obtained in the same manner as in Example 1. When the bending strength of the protective cover measured by the bending test method according to ASTM-D790 is S (kgf / cm ² ), and the thickness of the protective cover is T (mm), the strength of the protective cover (S × T) is 1425. <Example 4> As a protective cover, a plastic cover having a thickness of 1500 μm and a multilayer structure including polymethyl methacrylate resin / polycarbonate resin / polymethyl methacrylate resin having an in-plane retardation of 112.4 nm was used ( An optical member was obtained in the same manner as in Example 1 except that it was manufactured by Kuraray Corporation under the product name "MT3LTR"). When the bending strength of the protective cover measured by the bending test method according to ASTM-D790 is S (kgf / cm ² ), and the thickness of the protective cover is T (mm), the strength of the protective cover (S × T) is 1425. <Comparative Example 1> As a protective cover, a plastic cover (manufactured by Mitsubishi Gas Chemical Co., Ltd., with a phase difference of 7605 nm and a multilayer structure including a polymethyl methacrylate resin and a polycarbonate resin with a thickness of 1450 μm was used.) "HMR551T"), except that an optical member was obtained in the same manner as in Example 1. When the bending strength of the protective cover measured by the bending test method according to ASTM-D790 is S (kgf / cm ² ), and the thickness of the protective cover is T (mm), the strength of the protective cover (S × T) is 1377. <Comparative Example 2> An optical member was obtained in the same manner as in Example 1 except that a polarizing plate and a plastic cover were bonded together without using a high retardation film and an adhesive through an interlayer filling adhesive. <Comparative Example 3> An optical member was obtained in the same manner as in Example 2 except that a polarizing plate and a plastic cover were bonded to each other without using a high retardation film and an adhesive through an interlayer filling adhesive. <Comparative Example 4> An optical member was obtained in the same manner as in Example 3, except that a polarizing plate was bonded to a plastic cover through an interlayer filling adhesive without using a high retardation film and an adhesive. <Comparative Example 5> An optical member was obtained in the same manner as in Example 4 except that a polarizing plate and a plastic cover were bonded together without using a high retardation film and an adhesive through an interlayer filling adhesive. <Comparative Example 6> An optical member was obtained in the same manner as in Comparative Example 1 except that a polarizing plate and a plastic cover were bonded to each other without using a high retardation film and an adhesive through an interlayer filling adhesive. For the optical members of Examples 1 to 4 and Comparative Examples 1 to 6, the front brightness and color shift when the liquid crystal display device including each optical member was observed with polarized sunglasses were evaluated as follows. (1) Method for measuring front brightness The LED surface light source "LPDC1-12150NCW-1R6" from ITEC is placed on the back side (polarizing plate side) of the optical member, and the polarizing plate envisioned as polarized sunglasses is placed on the front face of the optical member. Side (plastic cover side), the brightness of the light source (unit: cd / m ² ) was measured using ConoScope (manufactured by AUTRONIC MELCHERS Co., Ltd.) through the optical member and the polarizing plate. The polarizing plate is arranged such that the absorption axis of the polarizing element and the absorption axis of the polarizing element of the optical member are orthogonal to each other. (2) Measurement method of color shift The light source, optical member, and polarizing plate are arranged in the same way as the measurement of frontal brightness, and ConoScope (manufactured by AUTRONIC MELCHERS Co., Ltd.) is used to measure the azimuth in the direction of polar angle 0 ° to 60 ° ° ~ 360 ° hue, x value and y value. As the color shift amount (Δxy value), set the x value and y value at any two points to (x _A , y _A ) and (x _B , y _B ), and set the following formula: {(x _A- x _B ) The maximum value of ² + (y _A -y _B ) ² } ^1/2 is taken as the Δxy value. The polarizing plate is arranged such that the absorption axis of the polarizing element and the absorption axis of the polarizing element of the optical member are orthogonal to each other. Table 1 shows the measurement results of the front luminance and color shift of the optical members of Examples 1 to 4 and Comparative Example 1, and Table 2 shows the measurement results of the front luminance and color shift of the optical members of Comparative Examples 2 to 6. In Tables 1 and 2, as the measurement results of the color shift, an xy chromaticity diagram (horizontal axis: x value, vertical axis: y value) and a color shift amount (Δxy value) are shown. [Table 1]

[Table 2]

[Industrial Applicability] The optical member of the present invention can be preferably used in mobile phones, portable information terminals, digital cameras, camcorders, portable game machines, car navigation, photocopying machines, printing LCD display devices for watches, fax machines, clocks, microwave ovens, etc.

1‧‧‧偏光膜
2‧‧‧高相位差層
3‧‧‧保護蓋
4‧‧‧黏著劑
5‧‧‧層間填充黏著劑
6‧‧‧抗反射膜
10‧‧‧光學構件
11‧‧‧光學構件
12‧‧‧光學構件1‧‧‧ polarizing film
2‧‧‧ high phase difference layer
3‧‧‧ protective cover
4‧‧‧ Adhesive
5‧‧‧ interlayer filling adhesive
6‧‧‧Anti-reflective film
10‧‧‧ Optical components
11‧‧‧ Optical components
12‧‧‧ Optical components

圖1係本發明之一個實施形態之光學構件之剖視圖。圖2係本發明之另一實施形態之光學構件之剖視圖。圖3係本發明之又一實施形態之光學構件之剖視圖。FIG. 1 is a cross-sectional view of an optical member according to an embodiment of the present invention. Fig. 2 is a sectional view of an optical member according to another embodiment of the present invention. 3 is a cross-sectional view of an optical member according to another embodiment of the present invention.

1‧‧‧偏光膜 1‧‧‧ polarizing film

2‧‧‧高相位差層 2‧‧‧ high phase difference layer

3‧‧‧保護蓋 3‧‧‧ protective cover

4‧‧‧黏著劑 4‧‧‧ Adhesive

10‧‧‧光學構件 10‧‧‧ Optical components

Claims

An optical component has a polarizing film, a high retardation layer, and a protective cover in this order. The in-plane phase difference of the high retardation layer is 3000 nm to 30,000 nm, and the late phase axis of the high retardation layer and the polarizing film. The angle formed by the absorption axis is 40 ° to 50 °, and the in-plane phase difference of the protective cover is 7000 nm or less.

The optical member according to claim 1, wherein the in-plane phase difference of the protective cover is 1000 nm or less.

For example, the optical component of claim 1 or 2, wherein the angle formed by the late phase axis of the protective cover and the absorption axis of the polarizing film is -5 ° to 5 ° or 85 ° to 95 °.

For example, the optical component of claim 1 or 2, wherein the angle between the late phase axis of the protective cover and the absorption axis of the polarizing film is 40 ° to 50 °, and the late phase axis of the protective cover and the high retardation layer The angle formed by the late phase axis is -5 ° to 5 ° or 85 ° to 95 °.

For the optical component of claim 1 or 2, wherein the thickness of the protective cover is 1000 μm or more.

For example, the optical member of claim 1 or 2, wherein the bending strength of the protective cover obtained by the bending test method of ASTM-D790 is set to S (kgf / cm ² ), and the thickness of the protective cover is set to T ( mm), the value of S × T is 400 or more.

The optical member according to claim 1 or 2, wherein an adhesive is filled between the protective cover and the high retardation layer.

The optical member according to claim 1 or 2, wherein an anti-reflection film is laminated on the protective cover on the side opposite to the polarizing film.

A liquid crystal display device includes the optical member according to any one of claims 1 to 8.