201245774 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種具有光擴散層之偏光元件保護膜》 【先前技術】 為了防止表面之劃痕，在液晶顯示器或電漿顯示面板、 布朗管（陰極射線管：CRT，Cathode-Ray Tube)顯示器、有 機電致發光（EL ’ Electroluminescence)顯示器等圖像顯示 裝置之顯示面上通常設置有具有高硬度性能之保護膜。 又，若外光映入圖像顯示裝置之顯示面，則有損視認性， 因此於重視圖像質量之電視或個人電腦、於外光較強之屋 外使用之攝影機或數位相機、利用反射光進行顯示之行動 電話等中’有時亦對保護膜賦予防止外光映入之功能，使 用利用光學多層膜之干涉之無反射處理技術、或藉由在表 面形成微細之凹凸而使入射光散射並將映入像暈映之防眩 處理技術。尤其是後者之防眩處理技術相對廉價，因此可 較佳地用於大型監視器或個人電腦等用途。 又，於大畫面圖像顯示裝置用途例如壁掛電視用途中， 薄型化及輕量化之需求已表面化 圖像顯示裝置之進一步 對於保護膜，對應於圖像顯示元件之薄型大晝面化，亦要 求加強圖像顯示元件之強度之功能，或要求保護膜自身之 薄壁化。作為符合該等要求之保護膜，就於機械強度、对 久性成本方面優異之方面而言，例如可使用包含聚酯系 樹脂之膜作為基材膜（參照日本專利特開應_3541號公報 (專利文獻1)) 〇 162573.doc 201245774 【發明内容】 於使用包含聚酯系樹脂之膜作為基材膜之情形時，由於 可調整至所需之強度、厚度’而且於成本方面有利，因此 通常延伸該樹脂膜而使用。由於經延伸之樹脂膜具有雙折 射性，因此存在產生由相位差所引起之暈斑而視認性較差 之問題。 於專利文獻1中，記載有藉由將偏光板保護膜之總霧度 設為10〜80%之範圍内’而防止由基材膜之雙折射性所引 起之暈斑。然而，暈斑之消除並非僅與總霧度相關，即便 為具有上述範圍内之總霧度之保護膜，亦;}^在產生暈斑之 情形。又’若將總霧度設定為非常高之值則可抑制暈斑之 產生，但於此情形時表面之光澤受損而外觀品質下降。 本發明之目的在於提供一種表面具有光澤而且抑制主要 由基材膜之雙折射性引起之由蟓射光產生之暈斑的偏光元 件保護膜。 本發明發現由透射光引起之暈斑之產生亦與透射圖像清 晰度之總和相關。本發明包含下述者。 [1] 一種偏光元件保護膜，其係具有光擴散層者，並且 透射圖像清晰度測定試驗中之透射圖像清晰度Cn(%)之 總和值T。(❶/。）滿足下述式（1)之關係’且總霧度值H(%)滿足 下述式（2)之關係， 上述透射圖像清晰度測定試驗係通’過與透射光之光線抽 正交且以10 mm/min之速度移動之寬度n(mm)之光梳而測 定試驗片之透射光之光量者， 162573.doc 201245774 於上述透射圖像清晰度測定試驗中將光線軸上具有上述 光梳之透射部分時之透射光量的最高值設為!^^，將光線轴 上具有上述光梳之遮光部分時之透射光量的最小值設為％ 之情形時’上述透射圖像清晰度Cn(%)係根據下述式（3)而 算出， 上述總和值Te為上述光梳之寬度n(mm)分別為〇. 125、 0.5、1、2之情形時之透射圖像清晰度(：；〇丨25、C().5、C,、（:2 之總和值， 100^TC^200 式（1) 40各HS60 式（2) cn={(Mn-mn)/(Mn + mn)}xl〇〇 式（3)。 [2] 如[1]之偏光元件保護膜，其係積層基材膜與上述光 擴散層而成，並且該基材膜具有雙折射性。 [3] 如[2]之偏光元件保護膜，其中上述基材膜之面内延 遲值為400 nm以上。 [4] 如[2]或[3]之偏光元件保護膜，其中上述基材膜係 以聚酯系樹脂為主成分。 [5] 如[2]至[4]中任一項之偏光元件保護膜，其中上述 基材膜之厚度為50 μηι以下。 [6] 如[1]至[5]中任一項之偏光元件保護膜，其中上述 光擴散層含有透光性樹脂與透光性微粒子。 [7] 如[6]之偏光元件保護膜，其中上述光擴散層之層厚 為10 μηι以上且20 μηι以下。 [8] 如[6]或[7]之偏光元件保護臈，其中上述透光性微 I62573.doc 201245774 &子+有重量平均粒徑為3〜5·5㈣之第以光性微粒子與 重量平均粒徑為7·2〜9 μηι之第2透光性微粒子。 [9]如[6]至[8]中任一項之偏光元件保護膜，其中上述 光擴散層係藉由具有如下步驟之方法而形成：塗敷步驟， 其塗敷含有上述透光性樹脂及上述透光性微粒子之塗敷液 而形成塗敷層；壓縮步驟，其使平坦面抵壓上述塗敷層之 表面而壓縮上述塗敷層；及硬化步驟，其將上述塗敷層硬 化。 [1〇]如[6]至[9]中任一項之偏光元件保護膜，其中上述 光擴散層中’上述透光性微粒子之體積填充率為4〇%以 上。 根據本發明之偏光元件保護膜’可構成抑制由透射光引 起之暈斑之產生，且表面具有光澤的外觀品質、顯示品質 良好之圖像顯示裝置。 【實施方式】 [偏光元件保護膜] 本發明之偏光元件保護膜具有光擴散層。光擴散層係例 如積層於基材膜上。偏光元件保護膜亦可具有除上述光擴 散層及基材膜以外之其他層。 圖1係表示本發明之保護膜之較佳例之概略剖面圖。本 發明之圖1所示之偏光元件保護膜100具備基材膜101與積 層於基材膜101上之光擴散層102。光擴散層1〇2係以透光 性樹脂103為基材之層，於透光性樹脂103中分散透光性微 粒子104而成。以下，進一步詳細地說明本發明之偏光元 162573.doc 201245774 件保護膜。 <偏光元件保護膜之光學特性> 本發明之偏光元件保護膜係透射圖像清晰度測定試驗中 之透射圖像清晰度cn(%)之總和值Te(%)滿足以下式（1)之關 係： 100^TC^200 式（1) 且總霧度值H(%)滿足以下式（2)之關係： 40SHS60 式⑺。 上述透射圖像清晰度測定試驗係通過與透射光之光線軸 正交且以10 mm/min之速度移動之寬度n(mm)之光梳測定 試驗片（偏光元件保護膜）之透射光之光量者。具體而言， 使用圖像清晰度（Image Clarity)測定器（Suga Test Instruments 製造）測定。圖像清晰度測定器由將透射狹縫之光作為平 行光線而垂直地入射至試驗片中，並通過移動該透射光之 光梳進行檢測的光學裝置與將經檢測之光量之變動記錄為 波形的測量系統裝置構成。光梳之明部與暗部之寬度之比 為1:1 ’且其寬度n(mm)設為〇 125、〇 5、1、2之4種，移動 速度设為1〇 mm/min。 於透射圖像清晰度測定試驗中將光線轴上具有光梳之透 射4刀(明)時之透射光量的最高值設為Μη，將光線轴上 具有光梳之遮光部分（暗部）時之透射光量之最小值設為爪 之情形時’透射圖像清晰度Cn(%)係由下述式⑺算出： Cn-{(Mn-mn)/(Mn+mn)jxl〇〇 式（3)。 總和值Tc(〇/0)係光梳之寬度n(_)分別為〇⑵、〇 、 162573.doc 201245774 2之情形時之4個透射圖像清晰度C〇.丨d%) ' C0.5(%)、 Ci(%)、C2(%)之總和值，因此可取的最大值為400〇/〇。 藉由總和值Tc(%)滿足上述式（1)之關係，總霧度值h(〇/〇) 滿足上述式（2)之關係’可提供表面具有光澤，且抑制由透 射光引起之暈斑之產生的偏光元件保護膜。 此處’「總霧度值」係根據表示對偏光元件保護膜照射 光而透射之光線之總量的總光線透射率Tt與由偏光元件保 護膜擴散而透射之擴散光線透射率Td之比，並藉由以下式 (4)而求出： 總霧度（°/〇)=(Td/Tt)xl00 (4)。 總光線透射率Tt係與入射光同轴直接透射之平行光線透 射率Tp與擴散光線透射率Td之和。總光線透射率Tt及擴散 光線透射率Td係依據JIS K 7361所測定之值》 具體而言’偏光元件保護膜之總霧度值係以下述方式而 測定。即，首先，為了防止膜之翹曲，而使用光學性透明 黏著劑，以偏光元件保護膜之光擴散層i 〇2成為表面之方 式將基材膜101側貼合至玻璃基板上而製作試驗片，對該 s式驗片測定總霧度值。總霧度值係使用依據JIS κ 7 13 6之 霧度透射率計（例如村上色彩技術研究所股份有限公司製 ^之霧度计「HM-150」）測定總光線透射率Tt及擴散光線 透射率（Td) ’並藉由上述式而算出。 <光擴散層> 圖1所不之偏光兀件保幾膜丨〇〇具備積層於基材膜ι〇ι上 之光擴散層102。光擴散層1〇2係以透光性樹脂1〇3為基材 162573.doc 201245774 之層’於透光性樹脂1 〇3中分散透光性微粒子104而成。再 者，亦可於基材膜101與光擴散層102之間具有其他層（包 含接著劑層）》 作為透光性樹脂103，只要為具有透光性者則並無特別 限定，例如可使用：紫外線硬化型樹脂、電子束硬化型樹 脂等電離放射線硬化型樹脂或熱硬化型樹脂之硬化物、熱 塑性樹脂、金屬烷氧化物之硬化物等。於使用電離放射線 硬化型樹脂、熱硬化型樹脂或金屬烷氧化物之情形時，藉 由電離放射線之照射或加熱使該樹脂硬化而形成透光性樹 脂103。其中，於用作具有較高之硬度且設置於液晶顯示 裝置表面之偏光元件保護膜之情形時，就可賦予較高之耐 擦傷性之方面而言’較佳為電離放射線硬化型樹脂。 作為電離放射線硬化型樹脂，可列舉：多元醇之丙烯酸 酯或甲基丙烯酸酯之類多官能性丙烯酸酯；由二異氰酸酯 與多元醇及丙烯酸或曱基丙烯酸之羥基酯等合成之類的多 官能之丙烯酸胺基曱酸酯等。又，除該等以外，亦可使用 具有丙烯酸酯系之官能基之聚醚樹脂、聚醋樹脂、環氧樹 脂、醇酸樹脂、螺縮醛樹脂、聚丁二烯樹脂、多硫醇多烯 樹脂等。 作為熱硬化型樹脂，除包含丙烯酸多元醇與異氰酸醋預 聚物之熱硬化型胺基甲酸乙酷樹脂以外，可列舉：酚樹 脂、尿素三聚氰胺樹脂、環氧樹月旨、不飽和聚_樹脂、聚 矽氧樹脂。 作為熱塑性樹脂，可列舉：乙I纖維素、硝基纖維素、 162573.doc 201245774 乙醯丁基纖維素、乙基纖維素、甲基纖維素等纖維素衍生 物；乙酸乙烯酯及其共聚物、氣乙烯及其共聚物、偏二氣 乙烯及其共聚物等乙烯系樹脂；《乙烯曱醛、聚乙烯醇縮 丁醛等縮醛系樹脂；丙烯酸系樹脂及其共聚物、甲基丙烯 酸系樹脂及其共聚物等丙烯酸系樹脂；聚苯乙烯系樹脂； 聚醯胺系樹脂；聚酯系樹脂；聚碳酸酯系樹脂等。 作為金屬烷氧化物，可使用以矽烷氧化物系材料為原料 之氧化矽系基質等。具體而言，為四甲氧基矽烷'四乙氧 基矽烷等，可藉由水解或脫水縮合而製成無機系或有機無 機複合系基材（透光性樹脂）。 又’作為本發明中所使用之透光性微粒子丨〇4，可使用 具有透光性之有機微粒子或無機微粒子。例如可列舉：包 含丙烯酸系樹脂、三聚氰胺樹脂、聚乙烯、聚苯乙烯、有 機聚矽氧樹脂、丙烯酸-苯乙烯共聚物等之有機微粒子； 或包含碳酸鈣、二氧化矽' 氧化鋁、碳酸鋇、硫酸鋇、氧 化鈦、玻璃等之無機微粒子等。又，亦可使用有機聚合物 球或玻璃中空珠粒。透光性微粒子104可由1種微粒子構 成，亦可含有2種以上之微粒子。透光性微粒子1〇4之形狀 亦可為球狀、扁平狀、板狀、針狀、不定形狀等中之任一 者’但較佳為球狀或大致球狀。 透光性微粒子104之填充率較佳為40%以上，更佳為50% 以上。藉由透光性微粒子104之填充率處於該範圍内，而 滿足上述式（1)及（2)之關係之偏光元件保護膜之製作變容 易。本說明書中所言之透光性微粒子！ 〇4之填充率係以下 162573.doc •10· 201245774 述方式算出。首先，藉由光學顯微鏡而取得光擴散層l〇2 之圖像’隨機選定50 μιη X 5 0 μιη之區域測量透光性微粒子 104之數量（5次平均）’藉由透光性微粒子之調配對總微粒 子數加以區分’根據各微粒子之體積算出微粒子所占之總 體積。而且，測定光擴散層102之平均層厚，乘以5〇 μιη><50 μιη之面積，將所得之值作為測定區域中之光擴散 層之總體積。藉由用光擴散層之總體積除透光性微粒子 104所占之總體積，乘以100，而獲得透光性微粒子1〇4之 填充率。 此處，透光性微粒子104之重量平均粒徑較佳為〇 5 μιη 以上且15 μιη以下’更佳為3 μπι以上且9 μιη以下。若透光 性微粒子104之重量平均粒徑未達〇 5 μιη，則存在未充分 地散射波長區域為自380 nm至800 nm之可見光之情形。 又，於重量平均粒徑超過15 μπΐ2情形時，存在光擴散層 102整體之厚度變厚，而妨礙顯示器之薄型化之情形。再 者，透光性微粒子104之重量平均粒徑係使用利用庫爾特 原理（細孔電阻法）之庫爾特粒子計數器（貝克曼庫爾特公司 製造）而測定。 透光性微粒子104較佳為包含重量平均粒徑為3〜55 之第1透光性微粒子與重量平均粒徑為72〜9 μιη之第2透光 性微粒子。藉由調配此種含有2種微粒子之透練微粒子 104,而易於將透光性微粒子⑽之填充率設為4㈣以上， 即便藉由如下方法而形成光擴散 進而設為50%以上。又， 層’亦可容易使透光性樹脂_1〇3之透光性微粒子1〇4之填 162573.doc 201245774 充率設為40%以上，進而設為50%以上，容易以滿足上述 式（1)及（2)之關係之方式製作偏光元件保護膜，該方法包 括：塗敷步驟’其塗敷含有透光性樹脂及透光性微粒子之 塗敷液而形成塗敷層；壓縮步驟，其使平坦面抵麼塗敷層 之表面而壓縮塗敷層；及硬化步驟，其將塗敷層硬化。該 平坦面只要為具有均勻之平面者則無限定，例如可使用由 玻璃、金屬等所構成之板狀或輥狀者。 較佳為透光性微粒子104之折射率大於透光性樹脂1〇3之 折射率’其差較佳為自0.04至0.1 5之範圍》藉由將透光性 微粒子104與透光性樹脂1〇3之折射率差設為上述範圍内， 而產生由透光性微粒子104與透光性樹脂103之折射率差所 引起之適度之内部散射，從而容易以滿足上述式之關係 之方式控制偏光元件保護膜之總霧度值。 又’光擴散層之表面（與基材膜1〇1相反之側之表面）較 佳為僅由透光性樹脂1 〇3形成。即’透光性微粒子1 〇4較佳 為不自光擴散層102表面突出，而完全地埋沒在光擴散層 102内。若透光性微粒子1〇4自光擴散層1〇2表面突出，則 存在難以以透射圖像清晰度之總和值滿足上述（1)之關係之 方式製作偏光元件保護膜之情形。 光擴散層102之層厚較佳為1〇 μιη以上且20 μιη以下》於 未達10 μηι之情形時，有時透光性微粒子粒子丨〇4自光擴散 層102之表面突出。另一方面，若超過2〇 ，則偏光元件 保護膜整體變厚’而變得容易捲縮或變得容易破裂，因此 於操作之方面不利。 I62573.doc •12· 201245774 再者，本發明之偏光元件保護膜亦可進而具備積層至圖 1所示之光擴散層102上（與基材膜1 〇 1相反之側之面）之抗反 射層。抗反射層係為了儘可能地降低反射率而設置者，藉 由形成抗反射層，可防止映入顯示畫面。作為抗反射層， 可列舉：由較光擴散層1〇2之折射率低之材料所構成的低 折射率層；由較光擴散層102之折射率高之材料所構成的 高折射率層與由較該高折射率層之折射率低之材料所構成 的低折射率層之積層構造等。 <基材膜> 基材膜101係具有雙折射性之膜。較佳為相對於波長590 nm之光之面内之延遲值尺為1〇〇〜25〇〇 nm，進而較佳為 4〇〇〜150〇11〇1。於基材膜11之面内之延遲值小於1〇()111〇之 情形時，不易產生由雙折射性所引起之暈斑，即便產生暈 斑，亦難以對圖像質量之下降造成影響。基材膜丨丨之面内 之延遲值R係藉由以下式（5)而定義之值： R=(nx-ny)xd 式（5) » 於式（5)中， 心：基材膜之面内遲相軸方向之折射率， ny:基材膜之面内進相軸方向（與遲相軸方向正交之方向） 之折射率， d:基材膜之平均厚度。 基材膜101之材料並無特別限定，可使用公知之材質。 例如可列舉.包含聚對苯二曱酸乙二酯之類聚酯系樹脂、 聚乙烯或聚丙烯之類聚烯烴系樹脂、乙烯_乙酸乙烯酯系 162573.doc 201245774 樹脂、聚曱基丙烯酸曱酯之類丙烯酸系樹脂'降葙烯系樹 月曰之類環稀系樹脂等的合成高分子；以及包含二乙酸纖維 素或三乙酸纖維素之類纖維素系樹脂等之天然高分子。較 佳為基材膜10丨為無色透明，但為了面之識別等，於不妨 礙缺陷檢測性之範圍内，可為有色，亦可為半透明。 使用上述材料製造基材膜101之方法並無特別限定，可 藉由溶劑鑄膜法、擠壓法等公知之方法而製造。又，可使 用於膜成形後實施單軸延伸或雙軸延伸等延伸處理之基材 膜丨〇1。作為面内之延遲值R為上述之範圍内之基材膜 101，較佳為使用實施延伸處理之包含聚酯系樹脂之基材 膜101 »例如可列舉實施延伸處理之包含聚對苯二甲酸乙 二醋之基材膜101。 延伸通常係一面展開膜輥一面連續地進行，利用加熱爐 向輥之前進方向、與該前進方向垂直之方向、或此兩者延 伸。加熱爐之溫度通常為自構成基材膜1()1之樹脂之玻璃 轉移溫度附近起至玻璃轉移溫度+1GGt為止之範圍。 用作基材膜HH之聚S旨膜係以聚s旨為主成分之膜可為 以聚醋為主成分之單㈣，亦可為具有以聚醋為主成分之 :之多層臈。X ’亦可為對該等單層膜或多層膜之兩面或 =實施表面處理者，該表面處理可為藉由電f處理、息 =、熱處理、紫外線照射 '電子束照射等之表面改 取 '可為藉由高分子或金屬等之塗佈或蒸鍵等之薄膜形 。聚酿之重量佔據聚醋膜整體之比例通常為5〇重量％以 ，較佳為7〇重量％以上，更佳為90重量％以上。 162573.doc 201245774 作為聚醋’例如可列舉：聚對苯二曱酸乙二酯、聚間苯 一甲酸乙一醋、聚2,6-萘二甲酸乙二酯、聚對苯二甲酸丁 一酿、對苯一甲酸-1，4-環己二曱酯，亦可視需要使用該等 中之2種以上。其中’可較佳地使用聚對苯二曱酸乙二 酯。 聚對苯二曱酸乙二酯係具有作為二羧酸成分而源自對苯 二甲酸之結構單元與作為二醇成分而源自乙二醇之結構單 元的聚醋’較佳為總重複單元之8〇莫耳％以上為對苯二甲 酸乙二醋’亦可含有源自其他共聚成分之結構單元。作為 其他共聚成分’可列舉：間苯二曱酸、4-(β-氧基乙氧基） 苯甲酸、4,4'-二羧基聯苯、4,4,_二羧基二苯曱酮、雙（4_羧 基苯基）乙烧、己二酸、癸二酸' 5_磺基間苯二曱酸鈉、 1,4-二羧基環己燒等二羧酸成分：或丙二醇、丁二醇、新 戊二醇、二乙二醇、環己二醇、雙苯酚Α之環氧乙烷加成 物、聚6二醇、聚丙二醇、聚丁二醇等二醇成分。 該等二叛酸成分或二醇成分可視需要組合2種以上使 用。又’亦可與上述羧酸成分或二醇成分一起併用對羥基 苯曱酸等經基羧酸。作為其他共聚成分，亦可使用含有少 量之醯胺鍵、胺基甲酸乙酯鍵、醚鍵、碳酸酯鍵等之二缓 酸成分及/或二醇成分。作為聚對苯二曱酸乙二酯之製造 法’可應用使對苯二甲酸與乙二醇、以及視需要之其他二 羧酸及/或其他二醇直接反應之所謂的直接聚合法；或使 對苯二曱酸之二甲酯與乙二醇、以及視需要之其他二羧酸 之二甲酯及/或其他二醇進行酯交換反應之所謂的酯交換 162573.doc •15· 201245774 反應法等中之任意之製造法。 亦可視需要於聚酯中調配公知之添加劑，作為其例，可 列舉.潤滑劑 '抗結塊劑、熱穩㈣、抗氧化劑、抗靜電 劑、耐光劑、耐衝擊性改良劑。然而，於使用聚醋膜作為 防眩膜之基材膜之情形時，通常需要透明性， 將添加劑之添加量限制在最小限度。 為 聚雖膜較佳為經單軸延伸或雙軸延伸（以下亦將以此種 方式經單轴延伸或雙軸延伸之聚㈣僅記作「&伸㈣ 膜」：。延伸聚賴膜係機械性質、耐溶劑性、耐刮傷性、 成本等優異之臈’因此使用此種㈣膜之光學膜機械強度 等優異，並且可實現厚度之降低。 藉由將聚§0成形為膜狀，並實施單軸延伸處理或雙軸延 伸處理’可製作經延伸之聚酿膜。藉由進行延伸處理，可 獲得機械強度較高之聚醋膜。經延伸之聚醋膜之製作方法 為任意’並無特別限定，例如作為單轴延伸聚醋膜，可列 舉下方法.於玻璃轉移溫度以上之溫度下利用拉幅機對 將聚面曰炫融並擠塵成形為片狀之無配向膜橫向延伸後，實 施熱固定處理。又，若為雙轴延伸聚酿膜，可列舉如下方 法··於玻璃轉移溫度以上之溫度下利用拉幅機對將聚醋炫 融並擠塵成形為片狀之無配向膜縱向延伸，繼而橫向延伸 後實施熱固疋處理。於此情形時，延伸溫度通常為 較佳為9〇〜12〇t，延伸倍率通常為2>6倍較 佳為3〜5 · 5倍。^ yA + 延仲倍率較低，則存在聚酯膜不顯示 分之透明性之傾向。 J62573.doc 201245774 又為了減小配向主轴之變形，較理想為於延伸後進行 熱固疋處理前’對聚醋棋進行鬆弛處理。鬆弛處理時之溫 度通常為90〜2Q()t： ’較佳為。鬆他量係根據延 伸條件而不同，較佳為以鬆他處理後之聚醋膜之1下 之熱縮率成為2%以下之方式設定鬆他量及鬆弛處理時之 溫度。 熱固疋處理恤度可設為18Q〜2S〇〇c，較佳為2〇〇〜245〇c。 於熱固定處理中’為了減小g&向主軸之變形，&高耐熱性 等強度，較佳為首先利用固定長度進行熱固定處理後進 而進行寬度方向之鬆弛處理。此情形之鬆弛量較佳為以鬆 弛處理後之聚酯膜之15(TC下之熱縮率成為丨〜1〇%之方式進 灯調整，更佳為2〜5%。本發明中所使用之延伸聚酯膜之 配向主軸之變形的最大值通常為10度以下，較佳為8度以 下，進而較佳為5度以下。若配向主軸之最大值大於1〇 度，則存在於貼合至液晶顯示畫面上時色差不良變大之傾 向。再者，延伸聚酯膜之「配向主軸之變形之最大值」例 如了藉由大塚電子股份有限公司製造之相位差臈檢查裝置 RETS系統而測定。 基材膜101之厚度較佳為設為2〇〜1〇〇 μιη，更佳為設為 3 0 5 0 μηι。若基材膜ιοί之厚度未達2〇 ，則存在難以操 作之傾向，若厚度超過100 μϊη，則存在薄壁化之優點漸弱 之傾向。 <偏光元件保護膜之製造方法> 其次’對用以製造圖1所示之偏光元件保護膜之方法進 162573.doc 201245774 行說明。偏光元件保護膜100較佳為藉由包含下述步驟（A) 及（B)之方法而製造。 (A) 於基材膜101上塗敷分散有透光性微粒子丨〇4之含有透 光性樹脂之塗敷液而形成塗敷層之塗敷步驟；及 (B) 將上述塗敷層硬化之硬化步驟。 上述步驟（A)中所使用之塗敷液包含透光性微粒子1〇4、 構成光擴散層102之透光性樹脂103或形成其之樹脂（例如 電離放射線硬化型樹脂、熱硬化型樹脂或金屬烷氧化物） 及視需要之溶劑等其他成分。於使用紫外線硬化型樹脂作 為形成透光性樹脂103之樹脂之情形時，上述塗敷液含有 光聚合起始劑（自由基聚合起始劑）。作為光聚合起始劑， 例如可使用：苯乙酮系光聚合起始劑、安息香系光聚合起 始劑、二苯曱酮系光聚合起始劑、9-氧硫咄it星系光聚合起 始劑、三畊系光聚合起始劑、噁二唑系光聚合起始劑等。 又，作為光聚合起始劑，例如亦可使用：2,4,6-三甲基苯 甲醯基二苯基氧化膦、2,2，-雙（鄰氣苯基）·4,4'，5,5，-四苯基-1，2·-聯咪唑、ίο-丁基-2-氣吖啶酮、2-乙基蒽醌、二苯乙 二酮、9,10-菲醌、樟腦醌、苯甲醯甲酸甲酯、二茂鈦化合 物等。光聚合起始劑之使用量通常相對於塗敷液中所含有 之樹脂100重量份為0.5〜20重量份，較佳為1〜5重量份。再 者’為了將光擴散膜之光學特性及表面形狀設為均質者， 塗敷液中之透光性微粒子104之分散較佳為等向分散。 上述塗敷液之向基材膜上之塗佈例如可藉由凹版印刷塗 佈法、微凹版印刷塗佈法、棒式塗佈法、刀式塗佈法、氣 162573.doc 18- 201245774 刀式塗佈法、接觸式塗佈法、擠壓式塗佈法等而進行。於 塗敷塗敷液時，如上所述，較佳為以硬化後之光擴散層 1〇2之層厚成為10 μπι以上且20 μπι以下之方式調整塗敷層 厚。 為了改良塗敷液之塗敷性或改良接著性，亦可於基材膜 101之表面（光擴散層側表面）實施各種表面處理。作為表面 處理，可列舉：電暈放電處理、輝光放電處理、酸表面處 理、鹼表面處理、紫外線照射處理等。又，亦可於基材膜 上形成例如底塗層等其他層，並將塗敷液塗敷於該其他層 上。 又，為了提高本發明之偏光元件保護膜與偏光元件之接 著性，較佳為藉由各種表面處理而使基材膜101之表面（與 光擴散層相反之側之表面）親水化。 於上述步驟（Β)中，將塗敷層硬化。於使用電離放射線 硬化型樹脂、熱硬化型樹脂或金屬烷氧化物作為形成透光 性樹脂103之樹脂之情形時，形成上述塗敷層，視需要進 行乾燥（溶劑之去除），較佳為於使平坦面抵壓該塗敷層之 表面而壓縮塗敷層之狀態下或壓縮後，藉由電離放射線之 照射（於使用電離放射線硬化型樹脂之情形時）或加熱（於使 用熱硬化型樹脂或金屬烷氧化物之情形時）將塗敷層硬 化。作為電離放射線，可根據塗敷液中所含之樹脂之種類 而自紫外線、電子束、近紫外線、可見光、近紅外線、紅 外線、X射線等中適當選擇。該等之中，㈣為紫外線、 電子束，尤其是就操作簡便且可獲得高能量之方面而言， 162573.doc 201245774 較佳為紫外線。 作為紫外線之光源，例如可使用：低壓水銀燈、中壓水 銀燈、高壓水銀燈、超高壓水銀燈、碳弧燈、金屬鹵化物 燈氙氣燈等。又，亦可使用ArF準分子雷射、KrF準分子 雷射、準分子燈或同步加速器放射光等。該等之中，可較 佳地使用超高壓水銀燈、高壓水銀燈、低壓水銀燈、氙 弧 '金屬函化物燈。 又’作為電子束’可列舉由柯克勞夫·沃耳吞（C〇ckcr〇ft_201245774 VI. Description of the Invention: [Technical Field] The present invention relates to a polarizing element protective film having a light diffusing layer. [Prior Art] In order to prevent surface scratches, in a liquid crystal display or a plasma display panel, a Brown tube (Cathode Ray Tube: CRT, Cathode-Ray Tube) The display surface of an image display device such as a display or an organic electroluminescence display is usually provided with a protective film having high hardness performance. Moreover, if the external light is reflected on the display surface of the image display device, the visibility is impaired. Therefore, a television or a personal computer that emphasizes image quality, a camera or a digital camera that is used outside the house where the external light is strong, and reflected light are used. In a mobile phone or the like for display, the protective film may be provided with a function of preventing external light from being reflected, and the incident light may be scattered by using a non-reflective treatment technique using interference of the optical multilayer film or by forming fine irregularities on the surface. It will also be reflected in the anti-glare treatment technology. In particular, the latter anti-glare treatment technology is relatively inexpensive, and therefore can be preferably used for applications such as large monitors or personal computers. Further, in the use of a large-screen image display device, for example, in the use of a wall-mounted television, the demand for thinning and weight reduction has been further required for the surface-imaging image display device, which is required for the protective film to be thinner and larger than the image display device. The function of enhancing the strength of the image display element or the thinning of the protective film itself. As a protective film which meets such requirements, for example, a film containing a polyester resin can be used as a base film in terms of excellent mechanical strength and long-term cost (refer to Japanese Patent Laid-Open No. Hei_3541 (Patent Document 1)) 〇162573.doc 201245774 [Summary of the Invention] When a film containing a polyester resin is used as a substrate film, since it can be adjusted to a desired strength and thickness, and it is advantageous in terms of cost, Usually, the resin film is stretched and used. Since the stretched resin film has birefringence, there is a problem that blurring caused by a phase difference is generated and visibility is poor. In Patent Document 1, it is described that the haze caused by the birefringence of the base film is prevented by setting the total haze of the polarizing plate protective film to be in the range of 10 to 80%. However, the elimination of the halo is not only related to the total haze, even in the case of a protective film having a total haze within the above range, in the case where a halo is generated. Further, if the total haze is set to a very high value, the generation of blooming can be suppressed, but in this case, the gloss of the surface is impaired and the appearance quality is lowered. SUMMARY OF THE INVENTION An object of the present invention is to provide a polarizing element protective film which has a gloss on a surface and which suppresses a halo caused by ray light mainly caused by birefringence of a substrate film. The present inventors have found that the generation of halos caused by transmitted light is also related to the sum of the transmission image sharpness. The invention includes the following. [1] A polarizing element protective film which is a light diffusing layer and which has a total value T of a transmission image definition Cn (%) in a transmission image sharpness measurement test. (❶/.) satisfies the relationship of the following formula (1) and the total haze value H (%) satisfies the relationship of the following formula (2), and the above-described transmission image sharpness measurement test is passed through and transmitted light. For measuring the amount of transmitted light of the test piece, the light is combed orthogonally and moved at a speed of 10 mm/min to measure the amount of transmitted light of the test piece, 162573.doc 201245774, and the ray axis is determined in the above-described transmission image sharpness measurement test. The highest value of the amount of transmitted light when the transmissive portion of the optical comb is present is set to be ^^^, and the minimum value of the amount of transmitted light when the light-shielding portion of the optical comb has the light-shielding portion is set to %. The definition Cn (%) is calculated according to the following formula (3), and the total value Te is a clear transmission image when the width n (mm) of the optical comb is 〇. 125, 0.5, 1, 2, respectively. Degree (:; 〇丨25, C().5, C,, (: the sum of 2, 100^TC^200, (1) 40, each HS60, (2) cn={(Mn-mn)/( [2] The polarizing element protective film of [1], which is obtained by laminating a base material film and the light diffusion layer, and the base film has birefringence. [3] as in [2] The optical element protective film, wherein the substrate film has an in-plane retardation value of 400 nm or more. [4] The polarizing element protective film of [2] or [3], wherein the substrate film is mainly a polyester resin. [5] The polarizing element protective film according to any one of [2] to [4] wherein the substrate film has a thickness of 50 μη or less. [6] Any one of [1] to [5] The polarizing element protective film, wherein the light-diffusing layer contains a light-transmitting resin and a light-transmitting fine particle. [7] The polarizing element protective film according to [6], wherein the light-diffusing layer has a layer thickness of 10 μm or more and 20 μm [8] The polarizing element protection according to [6] or [7], wherein the above-mentioned light transmissive micro-I62573.doc 201245774 & sub+ has a weight average particle diameter of 3 to 5·5 (four) of the first optical microparticles The polarizing element protective film according to any one of [6] to [8] wherein the light diffusing layer is provided by the optically polarizing layer having a weight average particle diameter of 7 to 2 μm. Forming a coating step of applying a coating liquid containing the light-transmitting resin and the light-transmitting fine particles to form a coating layer; a step of compressing the coating layer by pressing a flat surface against the surface of the coating layer; and a hardening step of hardening the coating layer. [1] [6] to [9] In the light-transmitting element protective film, the volume filling ratio of the light-transmitting fine particles in the light-diffusing layer is 4% or more. The polarizing element protective film according to the present invention can constitute a suppression of generation of a halo caused by transmitted light, and An image display device having a glossy appearance quality and a good display quality. [Embodiment] [Polarizing Element Protective Film] The polarizing element protective film of the present invention has a light diffusing layer. The light diffusion layer is, for example, laminated on a substrate film. The polarizing element protective film may have a layer other than the above-mentioned light-diffusing layer and the base film. Fig. 1 is a schematic cross-sectional view showing a preferred embodiment of the protective film of the present invention. The polarizing element protective film 100 shown in Fig. 1 of the present invention includes a base film 101 and a light diffusion layer 102 laminated on the base film 101. The light-diffusing layer 1〇2 is a layer in which the light-transmitting resin 103 is a base material, and the light-transmitting fine particles 104 are dispersed in the light-transmitting resin 103. Hereinafter, the protective film of the polarizer 162573.doc 201245774 of the present invention will be described in further detail. <Optical Characteristics of Polarizing Element Protective Film> The total value Te(%) of the transmission image definition cn (%) in the transmission image sharpness measurement test of the polarizing element protective film of the present invention satisfies the following formula (1) Relationship: 100^TC^200 Equation (1) and the total haze value H(%) satisfies the relationship of the following formula (2): 40SHS60 Equation (7). The above-described transmission image sharpness measurement test measures the amount of transmitted light of the test piece (polarizing element protective film) by a light comb having a width n (mm) which is orthogonal to the ray axis of the transmitted light and moved at a speed of 10 mm/min. By. Specifically, it was measured using an Image Clarity measuring instrument (manufactured by Suga Test Instruments). The image sharpness measuring device records the fluctuation of the detected light amount as a waveform by an optical device that vertically transmits the light of the transmission slit as a parallel ray into the test piece, and detects the light comb by moving the transmitted light. The measurement system device is constructed. The ratio of the width of the bright portion to the dark portion of the comb is 1:1', and the width n (mm) is set to four types of 〇 125, 〇 5, 1, 2, and the moving speed is set to 1 〇 mm/min. In the transmission image sharpness measurement test, the highest value of the transmitted light amount when there is a light comb on the ray axis of 4 knives (bright) is Μη, and the transmission is performed when the ray has a light-shielding portion (dark portion) of the light comb. When the minimum value of the light amount is the case of the claw, the transmission image sharpness Cn (%) is calculated by the following formula (7): Cn - {(Mn - mn) / (Mn + mn) jxl 〇〇 (3). The sum value Tc(〇/0) is the width n(_) of the comb is 〇(2), 〇, 162573.doc 201245774 2, the four transmission images are sharp C〇.丨d%) ' C0. The sum of 5 (%), Ci (%), and C2 (%), so the maximum value that can be taken is 400 〇 / 〇. By satisfying the relationship of the above formula (1) by the sum value Tc(%), the total haze value h(〇/〇) satisfies the relationship of the above formula (2), which can provide a surface glossiness and suppress halo caused by transmitted light. The polarizing element protective film produced by the spot. Here, the 'total haze value' is a ratio of the total light transmittance Tt indicating the total amount of light transmitted by the light of the polarizing element protective film to the diffused light transmittance Td transmitted by the polarizing element protective film. It is obtained by the following formula (4): Total haze (°/〇) = (Td/Tt) xl00 (4). The total light transmittance Tt is the sum of the parallel light transmittance Tp and the diffused light transmittance Td which are directly transmitted coaxially with the incident light. The total light transmittance Tt and the diffused light transmittance Td are values measured in accordance with JIS K 7361. Specifically, the total haze value of the polarizing element protective film is measured in the following manner. In other words, in order to prevent warpage of the film, an optically transparent adhesive is used, and the light-diffusing layer i 〇 2 of the polarizing element protective film is bonded to the glass substrate so that the light-diffusing layer i 〇 2 becomes a surface. Tablets, the total haze value was determined for the s-type test piece. The total haze value is measured by a haze transmittance meter (for example, a haze meter "HM-150" manufactured by Murakami Color Technology Co., Ltd.) according to JIS κ 7 13 6 to measure total light transmittance Tt and diffusion light transmission. The rate (Td)' is calculated by the above formula. <Light diffusing layer> The polarizing element of Fig. 1 has a light-diffusing layer 102 laminated on the base film ι. The light-diffusing layer 1〇2 is formed by dispersing the light-transmitting fine particles 104 in the light-transmitting resin 1 〇3 with the light-transmitting resin 1〇3 as a base material 162573.doc 201245774. Further, other layers (including an adhesive layer) may be provided between the base film 101 and the light diffusion layer 102. The light-transmitting resin 103 is not particularly limited as long as it has light transmissivity, and for example, it can be used. : an ionizing radiation-curable resin such as an ultraviolet curable resin or an electron beam curable resin, or a cured product of a thermosetting resin, a thermoplastic resin, a cured metal alkoxide, or the like. In the case of using an ionizing radiation-curable resin, a thermosetting resin or a metal alkoxide, the resin is cured by irradiation or heating of ionizing radiation to form a light-transmitting resin 103. Among them, in the case of being used as a polarizing element protective film having a high hardness and provided on the surface of a liquid crystal display device, it is preferable to provide an ionizing radiation curable resin in terms of imparting high scratch resistance. Examples of the ionizing radiation-curable resin include polyfunctional acrylates such as acrylates and methacrylates of polyhydric alcohols; and polyfunctional compounds such as diisocyanates and hydroxy esters of polyhydric alcohols and acrylic acid or mercaptoacrylic acid. Acryl phthalate or the like. Further, in addition to these, a polyether resin having an acrylate functional group, a polyester resin, an epoxy resin, an alkyd resin, a acetal resin, a polybutadiene resin, a polythiol polyene can also be used. Resin, etc. Examples of the thermosetting resin include a phenol resin, a urea melamine resin, an epoxy resin, and an unsaturated polysiloxane, in addition to a thermosetting urethane resin containing an acrylic polyol and an isocyanuric acid prepolymer. _ resin, polyoxyl resin. Examples of the thermoplastic resin include ethyl cellulose, nitrocellulose, cellulose derivatives such as 162573.doc 201245774 ethylene butyl cellulose, ethyl cellulose, and methyl cellulose; vinyl acetate and copolymers thereof. , ethylene-based resin such as ethylene and its copolymer, vinylidene dioxide and its copolymer; acetal resin such as vinyl furfural or polyvinyl butyral; acrylic resin and copolymer thereof, methacrylic acid Acrylic resin such as resin or copolymer thereof; polystyrene resin; polyamine resin; polyester resin; polycarbonate resin. As the metal alkoxide, a cerium oxide-based substrate using a decane oxide-based material as a raw material can be used. Specifically, tetramethoxydecane 'tetraethoxy decane or the like can be obtained by hydrolysis or dehydration condensation to form an inorganic or organic inorganic composite substrate (translucent resin). Further, as the light-transmitting fine particles 4 used in the present invention, organic fine particles or inorganic fine particles having light transmissivity can be used. For example, organic fine particles including an acrylic resin, a melamine resin, polyethylene, polystyrene, an organic polyoxynoxy resin, an acrylic-styrene copolymer, or the like; or calcium carbonate, cerium oxide, aluminum oxide, and cesium carbonate may be mentioned. Inorganic fine particles such as barium sulfate, titanium oxide, and glass. Further, an organic polymer sphere or a glass hollow bead may also be used. The light-transmitting fine particles 104 may be composed of one type of fine particles or may contain two or more kinds of fine particles. The shape of the light-transmitting fine particles 1〇4 may be any of a spherical shape, a flat shape, a plate shape, a needle shape, and an indefinite shape, but is preferably spherical or substantially spherical. The filling ratio of the light-transmitting fine particles 104 is preferably 40% or more, and more preferably 50% or more. When the filling ratio of the light-transmitting fine particles 104 is within this range, the production of the polarizing element protective film which satisfies the relationship of the above formulas (1) and (2) becomes easy. Translucent microparticles as described in this manual! The filling rate of 〇4 is calculated by the following method: 162573.doc •10· 201245774. First, the image of the light-diffusing layer 10 is obtained by an optical microscope. The number of the light-transmitting fine particles 104 (5 times average) is measured by randomly selecting a region of 50 μm × 5 5 μm. The total number of fine particles is distinguished. 'The total volume occupied by the fine particles is calculated from the volume of each fine particle. Further, the average layer thickness of the light-diffusing layer 102 was measured and multiplied by an area of 5 Å μηη >< 50 μm, and the obtained value was taken as the total volume of the light-diffusing layer in the measurement region. The filling ratio of the light-transmitting fine particles 1〇4 is obtained by dividing the total volume occupied by the light-transmitting fine particles 104 by the total volume of the light-diffusing layer and multiplying by 100. Here, the weight average particle diameter of the light-transmitting fine particles 104 is preferably 〇 5 μm or more and 15 μm or less', more preferably 3 μm or more and 9 μm or less. If the weight average particle diameter of the light-transmitting fine particles 104 is less than μ 5 μm, there is a case where visible light having a wavelength region of from 380 nm to 800 nm is not sufficiently scattered. Further, when the weight average particle diameter exceeds 15 μπΐ2, the thickness of the entire light diffusion layer 102 becomes thick, which hinders the thinning of the display. In addition, the weight average particle diameter of the light-transmitting fine particles 104 was measured using a Coulter particle counter (manufactured by Beckman Coulter Co., Ltd.) using the Coulter principle (fine pore resistance method). The light-transmitting fine particles 104 preferably include a first light-transmitting fine particle having a weight average particle diameter of 3 to 55 and a second light-transmitting fine particle having a weight average particle diameter of 72 to 9 μm. By arranging the fine-grained fine particles 104 containing the two kinds of fine particles, the filling ratio of the light-transmitting fine particles (10) can be easily made 4 (four) or more, and light diffusion can be made 50% or more by the following method. In addition, the layer ' can also easily fill the light-transmissive fine particles 1〇4 of the light-transmitting resin 〇3 to 162573.doc 201245774 The charge rate is 40% or more, and further 50% or more, and it is easy to satisfy the above formula. A polarizing element protective film is produced in a relationship between (1) and (2), the method comprising: a coating step of applying a coating liquid containing a light-transmitting resin and a light-transmitting fine particle to form a coating layer; and a compression step And compressing the coating layer by bringing the flat surface against the surface of the coating layer; and a hardening step of hardening the coating layer. The flat surface is not limited as long as it has a uniform plane. For example, a plate shape or a roll shape made of glass, metal or the like can be used. It is preferable that the refractive index of the light-transmitting fine particles 104 is larger than the refractive index of the light-transmitting resin 1〇3, and the difference is preferably in the range of from 0.04 to 0.15 by the light-transmitting fine particles 104 and the light-transmitting resin 1 When the refractive index difference of 〇3 is within the above range, moderate internal scattering caused by the difference in refractive index between the light-transmitting fine particles 104 and the light-transmitting resin 103 is generated, and the polarization is easily controlled so as to satisfy the relationship of the above formula. The total haze value of the component protective film. Further, the surface of the light-diffusing layer (the surface on the side opposite to the substrate film 〇1) is preferably formed only of the light-transmitting resin 1 〇3. That is, the light-transmitting fine particles 1 〇 4 are preferably not protruded from the surface of the light-diffusing layer 102, but are completely buried in the light-diffusing layer 102. When the light-transmitting fine particles 1〇4 protrude from the surface of the light-diffusing layer 1〇2, it is difficult to form the polarizing element protective film so that the sum of the transmission image sharpness satisfies the relationship of the above (1). The layer thickness of the light-diffusing layer 102 is preferably 1 μm or more and 20 μm or less. When the thickness is less than 10 μm, the light-transmitting fine particle particles 丨〇4 may protrude from the surface of the light-diffusing layer 102. On the other hand, when the thickness exceeds 2 Å, the entire polarizing element protective film becomes thick, and it becomes easy to be crimped or easily broken, which is disadvantageous in terms of handling. Further, the polarizing element protective film of the present invention may further have anti-reflection laminated on the light-diffusing layer 102 shown in FIG. 1 (the side opposite to the substrate film 1 〇1). Floor. The antireflection layer is provided to reduce the reflectance as much as possible, and by forming the antireflection layer, it is possible to prevent the display screen from being reflected. Examples of the antireflection layer include a low refractive index layer composed of a material having a lower refractive index than the light diffusion layer 1〇2, and a high refractive index layer composed of a material having a higher refractive index than the light diffusion layer 102. A laminated structure of a low refractive index layer composed of a material having a lower refractive index than the high refractive index layer. <Substrate film> The base film 101 is a film having birefringence. Preferably, the retardation value in the plane of the light with respect to the wavelength of 590 nm is from 1 〇〇 to 25 〇〇 nm, and further preferably from 4 〇〇 to 150 〇 11 〇 1 . When the retardation value in the plane of the base film 11 is less than 1 〇 () 111 Å, the haze caused by the birefringence is less likely to occur, and even if a halo is generated, it is difficult to affect the deterioration of the image quality. The retardation value R in the plane of the substrate film is defined by the following formula (5): R = (nx - ny) xd (5) » In the formula (5), the core: the substrate film The refractive index in the direction of the slow axis in the plane, ny: the refractive index of the in-plane axis direction of the substrate film (the direction orthogonal to the direction of the slow axis), d: the average thickness of the substrate film. The material of the base film 101 is not particularly limited, and a known material can be used. For example, a polyester resin containing polyethylene terephthalate, a polyolefin resin such as polyethylene or polypropylene, and an ethylene-vinyl acetate system 162573.doc 201245774 resin, decyl methacrylate A synthetic polymer such as an acrylic resin such as a decene-based resin such as a lanthanene-based resin, and a natural polymer such as a cellulose-based resin such as cellulose diacetate or cellulose triacetate. It is preferable that the base film 10 is colorless and transparent, but it may be colored or translucent in order to prevent surface defects from being recognized for surface defects. The method for producing the base film 101 using the above materials is not particularly limited, and it can be produced by a known method such as a solvent casting method or an extrusion method. Further, the substrate film 1 for performing elongation treatment such as uniaxial stretching or biaxial stretching after film formation can be used. As the base film 101 in which the retardation value R in the above-described range is within the above range, it is preferable to use the base film 101 including the polyester resin to be subjected to the elongation treatment. Base film 101 of ethylene vinegar. The stretching is usually carried out continuously while the film roll is unfolded, and is extended by the heating furnace in the forward direction of the roll, in the direction perpendicular to the advancing direction, or both. The temperature of the heating furnace is usually in the range from the vicinity of the glass transition temperature of the resin constituting the base film 1 (1) to the glass transition temperature + GGt. The film which is used as the film of the base film HH, which is mainly composed of polystyrene, may be a single component (four) which is mainly composed of polyester, or a multilayer which is mainly composed of polyester. X ' may also be a surface treatment of both sides of the single-layer film or the multilayer film or = surface treatment may be performed by electric f treatment, interest =, heat treatment, ultraviolet irradiation, electron beam irradiation, etc. 'It may be a film shape by coating or steaming of a polymer or a metal. The proportion of the weight of the polystyrene to the entire polyacetal film is usually 5% by weight, preferably 7% by weight or more, more preferably 90% by weight or more. 162573.doc 201245774 As a polyester vinegar, for example, polyethylene terephthalate, polyethylene glycol acetonate, polyethylene 2,6-naphthalate, polyethylene terephthalate For the p-benzoic acid-1,4-cyclohexanedidecyl ester, two or more of these may be used as needed. Among them, polyethylene terephthalate can be preferably used. Polyethylene terephthalate is a polyester having a structural unit derived from terephthalic acid as a dicarboxylic acid component and a structural unit derived from ethylene glycol as a diol component, preferably a total repeating unit. The above-mentioned 8 mol% or more of ethylene terephthalate's may also contain structural units derived from other copolymerization components. Examples of the other copolymerization component include: isophthalic acid, 4-(β-oxyethoxy)benzoic acid, 4,4′-dicarboxybiphenyl, 4,4,dicarboxybenzophenone, a dicarboxylic acid component such as bis(4-carboxyphenyl)ethene, adipic acid, sebacic acid '5-sulfoisophthalate, or 1,4-dicarboxycyclohexane: or propylene glycol or dibutyl A diol component such as an alcohol, neopentyl glycol, diethylene glycol, cyclohexanediol, an ethylene oxide adduct of diphenol quinone, poly 6 diol, polypropylene glycol, or polytetramethylene glycol. These two ortho-acid components or diol components may be used in combination of two or more kinds as needed. Further, a transcarboxylic acid such as p-hydroxybenzoic acid may be used in combination with the above carboxylic acid component or diol component. As the other copolymerization component, a diacid component and/or a diol component containing a small amount of a guanamine bond, a urethane bond, an ether bond or a carbonate bond may be used. As a method for producing polyethylene terephthalate, a so-called direct polymerization method in which terephthalic acid is directly reacted with ethylene glycol and, if necessary, other dicarboxylic acids and/or other diols; So-called transesterification of transesterification of dimethyl terephthalate with ethylene glycol, and optionally other dimethyl dicarboxylic acids and/or other diols 162573.doc •15· 201245774 Reaction Any method of manufacturing such as law. A known additive may be blended in the polyester as needed, and examples thereof include a lubricant 'anti-caking agent, heat stabilizer (four), an antioxidant, an antistatic agent, a light stabilizer, and an impact resistance improver. However, when a polyester film is used as the base film of the anti-glare film, transparency is generally required, and the amount of the additive to be added is minimized. Preferably, the film is uniaxially or biaxially stretched (hereinafter, the poly(4) which is uniaxially or biaxially extended in this manner is simply referred to as "& stretch (four) film": extended stretch film It is excellent in mechanical properties, solvent resistance, scratch resistance, cost, etc. Therefore, the optical film using such a film is excellent in mechanical strength and the like, and thickness reduction can be achieved. And the uniaxial stretching treatment or the biaxial stretching treatment can be carried out to produce an extended polystyrene film. By performing the stretching treatment, a polyester film having a higher mechanical strength can be obtained. The method for producing the stretched polyester film is arbitrary. 'There is not particularly limited. For example, as a uniaxially stretched polyester film, the following method can be used. The tenter is used to smear and squeezing the squash by a tenter at a temperature higher than the glass transition temperature. After the lateral stretching, the heat-fixing treatment is carried out. In addition, in the case of the biaxially-stretched pulverized film, the following method is exemplified: • The vinegar is melted and dusted into a sheet by a tenter at a temperature higher than the glass transition temperature. Longitudinal extension of the unaligned film Then, the heat-solid enthalpy treatment is carried out after the lateral stretching. In this case, the stretching temperature is usually preferably 9 〇 to 12 〇 t, and the stretching ratio is usually 2 gt; 6 times, preferably 3 to 5 · 5 times. ^ yA + When the retardation ratio is low, there is a tendency for the polyester film to show no transparency. J62573.doc 201245774 In order to reduce the deformation of the alignment main axis, it is preferable to perform the thermosetting treatment before the extension. The relaxation treatment is carried out. The temperature during the relaxation treatment is usually 90 to 2 Q () t: 'It is preferable. The amount of the relaxation is different depending on the extension conditions, and preferably the heat of the polyester film after the treatment. The shrinkage rate is set to 2% or less to set the amount of loosening and relaxation. The heat-fixing treatment can be set to 18Q~2S〇〇c, preferably 2〇〇~245〇c. In order to reduce the strength of g& to the main axis, and the high heat resistance, it is preferable to first perform heat-fixing treatment by a fixed length and then perform relaxation treatment in the width direction. In this case, the amount of slack is preferably relaxed. After the treatment of the polyester film 15 (the heat shrinkage rate under TC becomes 丨~ The lamp adjustment is preferably 1 to 5%. The maximum value of the deformation of the alignment main axis of the stretched polyester film used in the present invention is usually 10 degrees or less, preferably 8 degrees or less, and further It is preferably 5 degrees or less. If the maximum value of the alignment main axis is more than 1 degree, the chromatic aberration tends to become large when it is attached to the liquid crystal display screen. Further, the deformation of the alignment main axis of the polyester film is maximized. The value is measured, for example, by the phase difference 臈 inspection apparatus RETS system manufactured by Otsuka Electronics Co., Ltd. The thickness of the base film 101 is preferably set to 2 〇 to 1 〇〇 μηη, more preferably set to 3 0 5 . 0 μηι. If the thickness of the base film ιοί is less than 2 Å, it tends to be difficult to handle, and if the thickness exceeds 100 μϊη, the advantage of thinning tends to be weak. <Manufacturing method of polarizing element protective film> Next, a method for manufacturing the polarizing element protective film shown in Fig. 1 will be described in 162573.doc 201245774. The polarizing element protective film 100 is preferably produced by a method comprising the following steps (A) and (B). (A) a coating step of forming a coating layer by coating a coating liquid containing a light-transmitting resin in which the light-transmitting fine particles 4 are dispersed on the base film 101; and (B) hardening the coating layer Hardening step. The coating liquid used in the above step (A) includes the light-transmitting fine particles 1〇4, the light-transmitting resin 103 constituting the light-diffusing layer 102, or a resin forming the same (for example, an ionizing radiation-curable resin, a thermosetting resin, or Metal alkoxides and other components such as solvents as needed. In the case where an ultraviolet curable resin is used as the resin for forming the light-transmitting resin 103, the coating liquid contains a photopolymerization initiator (radical polymerization initiator). As the photopolymerization initiator, for example, an acetophenone-based photopolymerization initiator, a benzoin-based photopolymerization initiator, a benzophenone-based photopolymerization initiator, and a 9-oxothiophene star photopolymerization can be used. A starter, a three-pill photopolymerization initiator, an oxadiazole photopolymerization initiator, and the like. Further, as the photopolymerization initiator, for example, 2,4,6-trimethylbenzimidyldiphenylphosphine oxide, 2,2,-bis(o-phenyl)-4,4' may also be used. ,5,5,-tetraphenyl-1,2·-biimidazole, ίο-butyl-2-azacridone, 2-ethyl hydrazine, diphenylethylenedione, 9,10-phenanthrenequinone, Camphorquinone, methyl benzoic acid methyl ester, titanium titanate compound, and the like. The amount of the photopolymerization initiator to be used is usually 0.5 to 20 parts by weight, preferably 1 to 5 parts by weight, per 100 parts by weight of the resin contained in the coating liquid. Further, in order to make the optical characteristics and surface shape of the light-diffusing film uniform, the dispersion of the light-transmitting fine particles 104 in the coating liquid is preferably dispersed in an isotropic manner. The coating of the coating liquid onto the substrate film can be carried out, for example, by gravure coating method, micro gravure coating method, bar coating method, knife coating method, gas 162573.doc 18-201245774 The coating method, the contact coating method, the extrusion coating method, and the like are carried out. When the coating liquid is applied, as described above, it is preferable to adjust the coating layer thickness so that the layer thickness of the light-diffusing layer 1 2 after curing is 10 μm or more and 20 μm or less. In order to improve the coating property of the coating liquid or to improve the adhesion, various surface treatments may be performed on the surface (light diffusion layer side surface) of the base film 101. Examples of the surface treatment include corona discharge treatment, glow discharge treatment, acid surface treatment, alkali surface treatment, and ultraviolet irradiation treatment. Further, another layer such as an undercoat layer may be formed on the substrate film, and a coating liquid may be applied to the other layer. Further, in order to improve the adhesion between the polarizing element protective film of the present invention and the polarizing element, it is preferred that the surface of the base film 101 (the surface on the side opposite to the light diffusing layer) is hydrophilized by various surface treatments. In the above step (Β), the coating layer is hardened. When an ionizing radiation-curable resin, a thermosetting resin, or a metal alkoxide is used as the resin for forming the light-transmitting resin 103, the coating layer is formed, and if necessary, dried (solvent removal), preferably When the flat surface is pressed against the surface of the coating layer to compress the coating layer or after compression, irradiation by ionizing radiation (in the case of using an ionizing radiation-curable resin) or heating (using a thermosetting resin) Or in the case of a metal alkoxide, the coating layer is hardened. The ionizing radiation can be appropriately selected from ultraviolet rays, electron beams, near ultraviolet rays, visible light, near infrared rays, infrared rays, X-rays, and the like depending on the kind of the resin contained in the coating liquid. Among these, (4) is ultraviolet light, electron beam, and especially in terms of easy operation and high energy, 162573.doc 201245774 is preferably ultraviolet light. As the light source of ultraviolet rays, for example, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon arc lamp, a metal halide lamp xenon lamp, or the like can be used. Further, an ArF excimer laser, a KrF excimer laser, an excimer lamp, or a synchrotron radiation may be used. Among these, ultrahigh pressure mercury lamps, high pressure mercury lamps, low pressure mercury lamps, and xenon arc metallization lamps can be preferably used. Further, 'as an electron beam' can be exemplified by Kröcker Wolfen (C〇ckcr〇ft_
Walton)型、範德格拉夫型、共振變壓型、絕緣空氣變壓 型、直線型 '高頻高壓加速器型、高頻型等各種電子束加 速器釋放之具有50〜1000 keV、較佳為100〜300 keV之能量 之電子束。 偏光元件保護膜中之Tc及Η例如可藉由下述所示之方法 而調整至本發明所規定之範圍。首先，藉由上述材料及方 法製造偏光元件保護膜，測定TC&H。其結果，於Te之值 過低之情形時，進行減少透光性微粒子之添加份數、大幅 度降低透光性微粒子之粒徑、使光擴散層之層厚變薄等中 之任一處置或組合2種以上之該等處置，相反於八之值過 高之情形時，進行與上述相反之處置，即增加透光性微粒 子之添加份數、大幅度增加透光性微粒子之粒徑、加厚光 擴散層之層厚等中之任一處置或組合2種以上之該等處 置，於Η之值過低之情形時，進行增加透光性微粒子之添 加份數、將透光性微粒子之形狀壓扁等中之任一處理或組 合該等處置，相反於Η之值過高之情形時’進行與上述相 I62573.doc 20· 201245774 反之處置即減少透光性微粒子之添力σ份數、使透光性微 粒子之形狀為球狀等中之任一處理或組合該等處置，再次 製造偏光70件保護膜，測定其几及Η。重複進行上述偏光 元件保護膜之製造及其Τ<；&Η之測定直至成為目標之几之 值及Η之值為止》 [偏光板] 本發明之偏光元件保護膜貼合於偏光元件之表面，而構 成包含偏光元件及偏光元件保護膜之偏光板。由於本發明 之偏光保護膜抑制相對於透射光所產生之暈斑，機械強度 亦優異，表面光澤優異，因此使用其之偏光板成為與其同 樣地抑制暈斑之產生’機械強度亦優異，表面光澤優異之 偏光板。作為偏光元件，可使用公知之偏光元件》偏光元 件通常包含配向吸附碘或二色性染料之聚乙烯醇系樹脂 膜。於偏光元件之至少一個面上貼合本發明之偏光元件保 護膜，而構成偏光板。亦可構成配置於圖像顯示元件之視 認側而使用之偏光板、及配置於背面側而使用之偏光板之 任一者。例如可以自視認側依序積層光擴散層102、基材 膜101、偏光元件之方式而配置偏光元件保護膜與偏光元 件，構成視認側之偏光板。例如可以自視認側依序積層偏 光元件、基材膜、光擴散層102之方式而配置偏光元件 保護膜與偏光元件’構成背面側之偏光板。亦可於一個偏 光元件之兩面貼合本發明之偏光元件保護膜而構成偏光 板。 [圖像顯示裝置] 162573.doc •21 · 201245774 使用本發明之偏光元件保護膜之偏光板構成圖像顯示元 件及使用其之圖像顯示裝置。此處，圖像顯示元件係以於 上下基板間具備封入液晶之液晶單元，並藉由施加電壓改 變液晶之配向狀態而進行圖像顯示之液晶面板為代表。如 此’具備本發明之偏光元件保護膜之圖像顯示裝置抑制相 對於透射光所產生之暈斑，而且機械強度優異，進而表面 光澤亦優異。 實施例 以下’列舉實施例更詳細地說明本發明，但本發明並不 限定於該等實施例。再者，以下之例中之偏光元件保護膜 的光學特性及透光性微粒子之重量平均粒徑之測定方法如 下。 (a) 透光圖像清晰度（：„之總和值几 使用圖像清晰度測定器（Suga Test Instruments製造）進行 上述透射圖像清晰度測定試驗，依據式（3)算出光梳之寬度 分別為0.125 mm、0.5 mm、1 mm、2 mm之情形時之透射 圖像清晰度 C0.125、C〇.5、C,、C2。然後算出 C0.125、C0.5、 ci、I之總和值tc。 (b) 總霧度值Η 使用依據JIS Κ 7136之霧度透射率計（村上色彩技術研究 所股份有限公司製造之霧度計r ΗΜ-150」），測定總光線 透射率Tt與由偏光元件保護膜擴散而透射之擴散光線透射 率Td’並依據式（4)算出總霧度值η。 (c) 透光性微粒子之重量平均粒徑 162573.doc •22- 201245774 使用利用庫爾特原理（細孔電阻法）之庫爾特粒子計數器 (貝克曼庫爾特公司製造）進行測定。 <實施例1> (1) 鏡面金屬製輥之製作 於直徑200 mm之鉄輥（藉由jis之STKM13A)之表面進行 工業用鍍鉻加工，繼而對表面進行鏡面研磨而製作鏡面金 屬製輥。所得之鏡面金屬製輥之鍍鉻面之維克氏硬度為 1000。再者’維克氏硬度係使用超音波硬度計MIC10 (Krautkramer公司製造），依據jIS z 2244進行測定（於以下 之例中維克氏硬度之測定法相同）。 (2) 偏光元件保護膜之製作 將季戊四醇三丙烯酸酯60重量份及多官能胺基甲酸乙酯 化丙稀酸酯（六亞曱基二異氰酸酯與季戊四醇三丙烯酸酯 之反應生成物）40重量份混合至丙二醇單甲醚溶液中，以 固形物成分濃度成為60重量％之方式進行調整而獲得紫外 線硬化性樹脂組合物。再者，自該組合物中去除丙二醇單 甲醚而進行紫外線硬化後之硬化物之折射率為153。 其次’相對於上述紫外線硬化性樹脂組合物之固形物成 分100重量份’添加作為透光性微粒子之重量平均粒徑為 7.0 μηι之苯乙烯系粒子25重量份及作為光聚合起始劑的 「Lucirin ΤΡΟ」（BASF公司製造，化學名：2,4,6-三曱基 本甲醯基氧化二苯基膦）5重量份，以固形物成分率成為6〇 重量°/〇之方式利用丙二醇單曱醚進行稀釋而製備塗敷液。 將該塗敷液塗敷於厚度38 μιη之雙軸延伸聚對苯二甲酸 162573.doc •23· 201245774 乙二酯（PET，Polyethylene Terephthalate)膜（基材膜）（面内 延遲值：1000 nm)上，於設定為80°C之乾燥機中乾燥1分 鐘。以紫外線硬化性樹脂組合物層成為輥側之方式利用橡 膠輥將乾燥後之基材膜擠壓密接於上述（1)中製作之鏡面金 屬製輥之鏡面。於此狀態下自基材膜側以按照h線換算光 量計成為300 mJ/cm2之方式照射強度20 m\V/cm2之來自高 壓水銀燈之光，使紫外線硬化性樹脂組合物層硬化，而獲 得具有平坦面之厚度14 μηι之包含光擴散層與基材膜的圖1 所示之構成之偏光元件保護膜。將其設為實施例1之偏光 元件保護膜。 <比較例1 > 作為比較例1之光學膜，而使用如下光學膜：該光學膜 於雙軸延伸聚對苯二甲酸乙二酯（PET)膜（基材膜）（商品 名：Lumirror，Toray股份有限公司製造）上具有主要由季 戊四醇四丙稀酸酯（PETA，Pentaerythritol Tetraacrylate)及 三羥甲基己内酯（HDI，Trimethylol Hexyllactone)形成之防 眩層，於防眩層中不含透光性微粒子。 〈比較例2> 作為比較例2之光學膜，而使用如下光學膜：該光學膜 於雙軸延伸聚對苯二甲酸乙二酯（PET)膜（基材膜）（商品 名：Lumirror ’ Toray股份有限公司製造）上具有主要由季 戊四醇四丙烯酸酯（PETA)、異氰尿酸三烯丙酯（商品名： TAIC(註冊商標））及異佛爾酮二異氰酸酯（ipDI，Is〇ph〇r()ne Diisocyanate)形成之硬塗層’於硬塗層中含有全說聚醚（防 162573.doc •24· 201245774 污劑）及重量平均粒徑為6 μπι之透光性微粒子（苯乙烯、乙 二醇二甲基丙稀酸輯（EDMA，Ethylene Glycol Dimethacrylate) 與曱基丙烤酸甲醋（MMA，Methyl Methacrylate)之共聚 物）。 <比較例3> 作為比較例3之光學膜，而使用如下光學膜：該光學膜 於雙軸延伸聚對苯二甲酸乙二酯（PET)膜（基材膜）（商品 名：Lumirror ’ Toray股份有限公司製造）上具有主要由季 戊四醇四丙烯酸酯（PETA)及異佛爾酮二異氰酸酯（IPDI)形 成之硬塗層’於硬塗層中含有重量平均粒徑為6.5 μιη之透 光性微粒子（苯乙烯、乙二醇二甲基丙烯酸酯（EDMA)及曱 基丙烯酸曱酯（ΜΜΑ)之共聚物）及重量平均粒徑為1〇〇 nm 之A1粒子及Mg凝聚物。 <比較例4> 作為比較例4之光學膜，而使用如下光學膜：該光學膜 於雙軸延伸聚對苯二甲酸乙二酯（PET)膜（基材膜）（商品 名：Lumirror，Toray公司製造）上具有主要由季戊四醇四 丙烯酸酯（PETA)及異佛爾酮二異氰酸酯（IPDI)形成之硬塗 層，於硬塗層中含有重量平均粒徑為3 μπι之透光性微粒子 (苯乙烯與乙二醇二甲基丙婦酸酯之共聚物）。 <比較例5> 作為比較例5之光學膜，而使用如下光學膜：該光學膜 於雙軸延伸聚對苯二甲酸乙二酯（PET)臈（基材膜）（商品 名：Lumirror ’ Toray公司製造）上具有主要由季戊四醇四 162573.doc •25· 201245774 丙烯酸醋（PETA)形成之硬塗層，於硬塗層中含有不定形形 狀之二氧化矽微粒子。 (液晶顯示裝置之製作） 又’使用所得之實施例1之偏光元件保護膜、比較例1〜4 之光學膜而製作液晶顯示裝置，依照下述方法評價藉由透 射光所造成之暈斑及表面之光澤。首先，自Sharp股份有 限公司製造之液晶顯示裝置「AQUOS(註冊商標）LC-20AX5」中剝離視認側偏光板，取代其而於與原來之偏光 板同軸之方向貼附分別貼合有實施例1之偏光元件保護 膜、比較例1〜4之光學膜作為視認側保護膜之偏光板，而 製作液晶顯示裝置。 (暈斑之評價） 使所得之液晶顯示裝置進行白色顯示，依照以下基準以 目測評價由透射光引起之暈斑之產生： A :幾乎不見暈斑 C:明顯可見暈斑。將結果示於表丨中。 (表面之光澤之評價） 使所得之液晶顯示裝置進行黑色顯示，根據使螢光燈於 液Ba顯示裝置之表面進行反射而映入之角度，依照以下基 準以目測評價表面之光澤： A :表面具有光澤 B:表面梢微具有光澤 C·表面無光澤。將結果示於表丨中。 162573.doc -26 - 201245774 [表1]Various types of electron beam accelerators such as Walton type, Van de Graaff type, resonant transformer type, insulated air transformer type, linear type 'high-frequency high-pressure accelerator type, high-frequency type, etc., have 50 to 1000 keV, preferably 100. An electron beam of ~300 keV energy. The Tc and Η in the polarizing element protective film can be adjusted to the range specified by the present invention by, for example, the method shown below. First, a polarizing element protective film was produced by the above materials and methods, and TC & H was measured. As a result, when the value of Te is too low, any one of reducing the number of added particles of the light-transmitting fine particles, greatly reducing the particle diameter of the light-transmitting fine particles, and thinning the thickness of the light-diffusing layer can be performed. Or combining two or more of these treatments, and in the case where the value of eight is too high, the treatment opposite to the above is performed, that is, the number of added particles of the light-transmitting fine particles is increased, and the particle diameter of the light-transmitting fine particles is greatly increased. When the thickness of the light-diffusing layer is increased, the amount of the light-transmitting fine particles is increased, and the light-transmitting fine particles are added. Any of the shapes of the flattening or the like, or a combination of the treatments, in contrast to the case where the value of the crucible is too high, 'to perform the above-mentioned phase I62573.doc 20·201245774, and vice versa, to reduce the σ of the translucent microparticles The number of the light-transmitting fine particles was spherical or the like, or a combination of these treatments, and 70 protective films of polarized light were again produced, and the number of defects was measured. The production of the above-mentioned polarizing element protective film is repeated, and the measurement of the Τ<;& 直至 is performed until the target value and the value of Η" [Polarizing Plate] The polarizing element protective film of the present invention is bonded to the surface of the polarizing element. Further, a polarizing plate including a polarizing element and a protective film of a polarizing element is formed. Since the polarizing protective film of the present invention suppresses the blooming caused by the transmitted light, the mechanical strength is excellent, and the surface gloss is excellent. Therefore, the polarizing plate using the same has the same mechanical strength and surface gloss. Excellent polarizing plate. As the polarizing element, a known polarizing element can be used. The polarizing element usually contains a polyvinyl alcohol-based resin film which adsorbs iodine or a dichroic dye. The polarizing element protective film of the present invention is bonded to at least one surface of the polarizing element to constitute a polarizing plate. Any one of a polarizing plate disposed on the viewing side of the image display element and a polarizing plate disposed on the back side may be formed. For example, a polarizing element protective film and a polarizing element may be disposed in such a manner that the light diffusing layer 102, the base film 101, and the polarizing element are sequentially laminated, and the polarizing plate on the viewing side is formed. For example, the polarizing element protective film and the polarizing element ′ may be disposed so as to form a polarizing plate on the back side of the polarizing element, the base film, and the light diffusing layer 102. The polarizing plate may be formed by laminating the polarizing element protective film of the present invention on both sides of one polarizing element. [Image display device] 162573.doc • 21 · 201245774 The polarizing plate using the polarizing element protective film of the present invention constitutes an image display element and an image display device using the same. Here, the image display element is represented by a liquid crystal panel in which a liquid crystal cell in which liquid crystal is sealed is provided between the upper and lower substrates, and an image is displayed by changing a alignment state of the liquid crystal by applying a voltage. The image display device including the polarizing element protective film of the present invention suppresses blooming caused by transmitted light, and is excellent in mechanical strength and excellent in surface gloss. EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the invention is not limited to the examples. Further, the optical characteristics of the polarizing element protective film and the method for measuring the weight average particle diameter of the light-transmitting fine particles in the following examples are as follows. (a) The transparency of the light-transmissive image (: the total value of the image is measured using the image sharpness tester (manufactured by Suga Test Instruments) for the above-described transmission image sharpness measurement test, and the width of the light comb is calculated according to the formula (3). Transmission image clarity C0.125, C〇.5, C, C2 for 0.125 mm, 0.5 mm, 1 mm, 2 mm. Then calculate the sum of C0.125, C0.5, ci, I (b) Total haze value 测定 The total light transmittance Tt is measured using a haze transmittance meter (a haze meter r ΗΜ-150 manufactured by Murakami Color Technology Research Co., Ltd.) according to JIS Κ 7136. The diffused light transmittance Td' transmitted by the polarizing element protective film is diffused and the total haze value η is calculated according to the formula (4). (c) The weight average particle diameter of the light transmitting fine particles is 162573.doc • 22- 201245774 The Coulter particle counter (manufactured by Beckman Coulter Co., Ltd.) was used for the measurement. <Example 1> (1) A mirror metal roll was produced in a roll having a diameter of 200 mm ( Industrial chrome processing by the surface of jis STKM13A), followed by surface A mirror-finished metal roll was produced by mirror-finishing, and the obtained chrome-plated surface of the mirror-finished metal had a Vickers hardness of 1000. Further, the Vickers hardness system used an ultrasonic hardness tester MIC10 (manufactured by Krautkramer Co., Ltd.) according to jIS z. 2244 was measured (the Vickers hardness was measured in the following example). (2) Preparation of polarizing element protective film 60 parts by weight of pentaerythritol triacrylate and polyfunctional urethane acrylate ( 40 parts by weight of the reaction product of the hexamethylene diisocyanate and the pentaerythritol triacrylate was mixed in a propylene glycol monomethyl ether solution, and the ultraviolet curable resin composition was obtained so as to have a solid content concentration of 60% by weight. Further, the refractive index of the cured product obtained by removing the propylene glycol monomethyl ether from the composition and ultraviolet curing is 153. Next, '100 parts by weight of the solid content component with respect to the ultraviolet curable resin composition' is added as a light transmission. 25 parts by weight of styrene particles having a weight average particle diameter of 7.0 μηι and "Lucirin Τ as a photopolymerization initiator" 5 parts by weight of ΡΟ 二醇 ( ( ( 制造 制造 BA BA BA BA BA BA BA BA BA BA BA BA BA BA BA BA BA BA BA BA BA 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙 丙The coating solution was prepared by diluting the ether. The coating solution was applied to a biaxially oriented polyterephthalic acid having a thickness of 38 μm. 162573.doc • 23· 201245774 Ethylene terephthalate (PET, Polyethylene Terephthalate) film (base film) (In-plane retardation value: 1000 nm), it was dried in a dryer set at 80 ° C for 1 minute. The dried base film is pressed and adhered to the mirror surface of the mirror-finished metal roll produced in the above (1) by a rubber roller so that the ultraviolet curable resin composition layer is on the roll side. In this state, the light from the high-pressure mercury lamp is irradiated with light having a strength of 20 m/V/cm 2 from the base film side to an amount of 300 mJ/cm 2 in accordance with the h-line conversion light meter, and the ultraviolet curable resin composition layer is cured. A polarizing element protective film having the thickness of 14 μm of a flat surface and having a light diffusion layer and a base film as shown in Fig. 1 . This was set as the polarizing element protective film of Example 1. <Comparative Example 1 > As the optical film of Comparative Example 1, an optical film was used in a biaxially stretched polyethylene terephthalate (PET) film (base film) (trade name: Lumirror) , manufactured by Toray Co., Ltd.) has an anti-glare layer mainly formed of pentaerythritol Tetraacrylate (PETA) and Trimethylol Hexyllactone (HDI), which is not contained in the anti-glare layer. Light-transmitting fine particles. <Comparative Example 2> As the optical film of Comparative Example 2, an optical film was used in a biaxially stretched polyethylene terephthalate (PET) film (base film) (trade name: Lumirror ' Toray) Co., Ltd. is made of mainly pentaerythritol tetraacrylate (PETA), triallyl isocyanurate (trade name: TAIC (registered trademark)) and isophorone diisocyanate (ipDI, Is〇ph〇r ( ) ne Diisocyanate) The hard coating formed by the hard coating contains all the polyether (anti-162573.doc •24·201245774 stain) and the light-weight microparticles with a weight average particle size of 6 μπ (styrene, B) Copolymer of EDMA (Ethylene Glycol Dimethacrylate) and Methyl Methacrylate (MMA). <Comparative Example 3> As the optical film of Comparative Example 3, an optical film was used in a biaxially stretched polyethylene terephthalate (PET) film (base film) (trade name: Lumirror ' Toray Co., Ltd. has a hard coat layer mainly composed of pentaerythritol tetraacrylate (PETA) and isophorone diisocyanate (IPDI), and contains a light-weight average particle size of 6.5 μηη in the hard coat layer. Microparticles (copolymer of styrene, ethylene glycol dimethacrylate (EDMA) and decyl decyl acrylate) and A1 particles and Mg condensate having a weight average particle diameter of 1 〇〇 nm. <Comparative Example 4> As an optical film of Comparative Example 4, an optical film was used in a biaxially stretched polyethylene terephthalate (PET) film (base film) (trade name: Lumirror, Toray has a hard coat layer mainly composed of pentaerythritol tetraacrylate (PETA) and isophorone diisocyanate (IPDI), and contains a light-transmitting fine particle having a weight average particle diameter of 3 μm in the hard coat layer ( Copolymer of styrene and ethylene glycol dimethyl propionate). <Comparative Example 5> As the optical film of Comparative Example 5, an optical film was used in which biaxially oriented polyethylene terephthalate (PET) ruthenium (base film) (trade name: Lumirror ' Toray has a hard coat layer mainly composed of pentaerythritol IV 162573.doc •25·201245774 acrylic vinegar (PETA), and contains an amorphous shape of cerium oxide microparticles in the hard coat layer. (Production of Liquid Crystal Display Device) The liquid crystal display device was produced by using the obtained polarizing element protective film of Example 1 and the optical films of Comparative Examples 1 to 4, and the vignetting by the transmitted light was evaluated according to the following method. The luster of the surface. First, the viewing-side polarizing plate is peeled off from the liquid crystal display device "AQUOS (registered trademark) LC-20AX5" manufactured by Sharp Co., Ltd., and is attached to the original polarizing plate in the direction coaxial with the original polarizing plate. The polarizing element protective film and the optical films of Comparative Examples 1 to 4 were used as a polarizing plate of the viewing side protective film to produce a liquid crystal display device. (Evaluation of blooming) The obtained liquid crystal display device was white-displayed, and the generation of blooming caused by transmitted light was visually evaluated according to the following criteria: A: almost no vignetting was observed C: Faint spots were clearly visible. The results are shown in the table. (Evaluation of gloss of surface) The obtained liquid crystal display device was subjected to black display, and the gloss of the surface was visually evaluated according to the following criteria based on the angle at which the fluorescent lamp was reflected on the surface of the liquid Ba display device: A: Surface Glossy B: The surface tip has a slight luster C. The surface is dull. The results are shown in the table. 162573.doc -26 - 201245774 [Table 1]
Η (%) Tc (%) 0).125 (%) C〇.5 (%) c, (%) c2 (%) 暈斑 表面光澤 比較例1 0.7 380 90.7 94.5 96.7 98.1 C A 比較例2 2.5 347 86.2 88.8 80.0 92.1 c B 比較例3 3.9 285 55.6 65.4 77.1 87.1 c C 比較例4 10.4 192 41.7 42.2 46.7 60.0 A C 比較例5 18.4 22 1.6 1.6 2.2 16.6 A C 實施例1 56.0 123 29.0 30.0 29.2 34.1 A A 根據表1可知，透射圖像清晰度之總和值Te滿足式（1)之 關係，而且總霧度值Η滿足式（2)之關係的實施例1之偏光 元件保護膜抑制由透射光引起之暈斑之產生，且表面具有 光澤。 (試驗結果之解析） 圖2表示對表1之實施例1之偏光元件保護膜及比較例1〜5 之光學膜之總霧度值Η與透射圖像清晰度之總和值Tc之關 係作圖而獲得之圖表。如圖2所示，根據比較例1〜5之光學 臈（通常之光學膜）之總霧度值Η與透射圖像清晰度之總和 值Tc之關係之作圖點導出曲線200之關係。另一方面，實 施例1之作圖點大幅度偏離曲線200。於與曲線2〇〇之關係 中，預測若為總霧度值Η與透射圖像清晰度之總和值丁。之 關係的作圖點位於實施例1之周邊區域201之光學膜，則可 構成與實施例1相同地抑制由透射光引起之暈斑之產生， 且表面具有光澤之圖像顯示裝置，從而導出式（1)及式（2) 之關係。 【圖式簡單說明】 圖1係表示本發明之偏光元件保護膜之較佳例之概略剖 162573.doc •27· 201245774 面圖。 圖2表示對實施例1之偏光元件保護膜及比較例1〜5之光 關係作 學膜的總霧度值Η與透射圖像清晰度之總和值几之 圖而獲得的圖表。 【主要元件符號說明】 100 偏光元件保護膜 101 基材膜 102 光擴散層 103 透光性樹脂 104 透光性微粒子 162573.doc •28·Η (%) Tc (%) 0).125 (%) C〇.5 (%) c, (%) c2 (%) Surface gloss gloss comparison Example 1 0.7 380 90.7 94.5 96.7 98.1 CA Comparative Example 2 2.5 347 86.2 88.8 80.0 92.1 c B Comparative Example 3 3.9 285 55.6 65.4 77.1 87.1 c C Comparative Example 4 10.4 192 41.7 42.2 46.7 60.0 AC Comparative Example 5 18.4 22 1.6 1.6 2.2 16.6 AC Example 1 56.0 123 29.0 30.0 29.2 34.1 AA According to Table 1 It can be seen that the polarizing element protective film of Example 1 in which the total value of the clarity of the transmission image satisfies the relationship of the formula (1) and the total haze value Η satisfies the relationship of the formula (2) suppresses the halation caused by the transmitted light. Produced with a glossy surface. (Analysis of Test Results) Fig. 2 is a graph showing the relationship between the total haze value Η of the polarizing element protective film of Example 1 of Table 1 and the optical film of Comparative Examples 1 to 5 and the total value Tc of the transmission image sharpness. And get the chart. As shown in Fig. 2, the relationship between the total haze value 光学 of the optical 臈 (normal optical film) of Comparative Examples 1 to 5 and the total value Tc of the transmission image sharpness is derived from the plotted curve 200. On the other hand, the plot point of Example 1 largely deviates from the curve 200. In the relationship with the curve 2〇〇, the prediction is the sum of the total haze value Η and the clarity of the transmission image. In the case of the optical film of the peripheral region 201 of the first embodiment, the image display device which suppresses the generation of the halo caused by the transmitted light and has a glossy surface can be formed in the same manner as in the first embodiment. The relationship between the formula (1) and the formula (2). BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a preferred embodiment of a polarizing element protective film of the present invention 162573.doc • 27· 201245774. Fig. 2 is a graph showing a graph of the sum of the total haze value Η and the sharpness of the transmission image of the polarizing element protective film of Example 1 and the optical relationship of Comparative Examples 1 to 5. [Description of main component symbols] 100 Polarizing element protective film 101 Substrate film 102 Light diffusing layer 103 Translucent resin 104 Translucent fine particles 162573.doc •28·