TW200305043A - Optically compensating film, polarizing plate and liquid crystal display - Google Patents

Optically compensating film, polarizing plate and liquid crystal display Download PDF

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TW200305043A
TW200305043A TW092105290A TW92105290A TW200305043A TW 200305043 A TW200305043 A TW 200305043A TW 092105290 A TW092105290 A TW 092105290A TW 92105290 A TW92105290 A TW 92105290A TW 200305043 A TW200305043 A TW 200305043A
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Taiwan
Prior art keywords
film
polymer
liquid crystal
polymer film
optical compensation
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TW092105290A
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Chinese (zh)
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TWI282028B (en
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Taku Nakamura
Yoji Ito
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Fuji Photo Film Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

To provide an optically compensating film has little change of optical characteristics resulted by being used under a severe circumstance, and has excellent durability. The invention provides a an optically compensating film comprising a polymer film which is obtained from a polymer having an optical elasticity of less than 10x10<SP>-12</SP> m2/N and water permeability of less than 1 g/m2.24 hrs measured according to a test method of JIS Z 0208 and has retardation value Re in the range of from 0 to 100 nm determined according to the following formula (I) and retardation value Rth in the range of from 70 to 500 nm determined according to the following formula (II), and an optically anisotropic layer consisting of liquid crystalline compounds over the polymer film. (I) Re = (nx-ny) x d (II) Rth = {(nx+ny)/2-nz} x d

Description

200305043 玖:、:發臟說明 (發明說明應敘明··發明所屬之技術領域、先前技術、內容、實施方式及圖式簡單說明） 一、 發明所屬之技術領域： 本發明係關於一種重量輕而且耐久性優異的光學補償 薄膜’以及關於一種使甩它之偏光板、影像顯示裝置。 二、 先前技術： 液晶顯示裝置與C RT比較之下，其係具有較薄型態、 重量輕、低耗電量等優異的特徵，因而一直被廣泛地使用在 筆記型個人電腦、顯示螢幕、電視、P D A、行動電話、汽車 追蹤器、錄影機、照相機等。但是，於現在主流的TN模式 液晶顯示裝置中，在原理上會產生依照觀察方向而變化顯示 色彩、及對比等視角特性上之問題。爲了改良此種視角特性 ，以及實現提高顯示品質之液晶顯示裝置，於日本專利第 2587398號中記載了一種將以碟狀液晶混雜配向之光學補 償薄膜間插在偏光板及液晶晶胞之間之手段。但是，依照此 種方法，會具有因光學補償薄膜及黏著劑的原故，而使得液 晶顯示裝置本紙變厚等問題。又且，在特開平7-191217號 公報及歐洲專利第091 1 656A2號說明書上乃記載了 一種藉 由使用在透明支撐體上塗設由碟狀液晶所形成的光學各向 異性層之光學補償薄膜來做爲偏光膜之單面保護膜構成的 橢圓偏光板，以使得液晶顯示裝置之厚度不變厚，並得以改 良視角。 三、發明內容： 【發明欲解決之課題】 200305043 然而，此種光學補償薄膜使用在高溫高溼等嚴格的環境 下，會產生應力及歪斜，且於該處易於發生相位差。由於此 相位差，可理解到在液晶顯示裝置上會生成邊框狀之光漏現 象（穿透上昇），而且使得液晶顯示裝置之顯示品質下降。特 別是在1 7吋以上的大型液晶顯示裝置之情況下，要能完全 地不光漏是很困難的。此外，曾提議將前述光學補償薄膜貼 合在偏光膜上，使具有做爲偏光膜之保護膜的功能，進而做 成簡單構造的液晶顯示裝置。但是，在使光學補償薄膜貼合 具有做爲偏光膜之保護膜的功能時，除了產生上述之問題以 外，當在高溫高溼下使用時水分會穿透光學補償薄膜，也產 生因該水分而使偏光膜之光學特性進一步下降等之問題。從 而，就光學補償薄膜而言，就需要求在高溫及高溼嚴格使用 條件下亦不會使光特性下降，而且水分不透過之耐久性等。 本發明即是鑑於前述問題，乃提供一種能夠於影像顯示 裝置上使用的情況下賦予視角之改良，同時前述影像顯示裝 置即使於嚴酷的條件下使用時也能減輕光漏等顯示品質下 降之光學補償薄膜及偏光板。又且，本發明之目的係在於提 供一種在嚴酷的條件下使用時所生成的光學特性變化少，而 且耐久性優異的光學補償薄膜及偏光板。又，本發明之其他 目的係在於提供一種廣視角，且在嚴酷的條件下使用情況可 減輕因所產生的光漏致使顯示品質下降，並且耐久性優異的 影像顯示裝置。 【解決課題之手段】， 本發明人等乃檢討光漏係使光學補償薄膜之光學特性 200305043 變化之原，因而得以認知發現以下二個原因： 其一爲影像顯示裝置在嚴酷的使用條件（高溫、高溼） 下，聚合物薄膜會膨脹或者收縮’因而使得光學補償薄膜之 光學特產生變化；另一者爲由於影像顯示裝置之背光點燈而 在光學補償薄膜之面內產生溫度分布，因爲此種熱度不均而 使光學特性產生變化。 基於此種認知發現並進一步檢討結果，發現光學補償薄 膜之光學特性變化與光彈性係數及透溼度間之關係，更進一 步重複地檢討，至此乃完成本發明。 本發明之解決手段係如以下所述。 (1) 一種光學補償薄膜，其係在一聚合物薄膜上方具有一 包括液晶性化合物的光學各向異性層，其特徵在於： 該聚合物薄膜係由具有光彈性係數爲1 〇 X 1 〇-1 2平 方公尺/牛頓以下，以及依照JIS Z0208試驗法所測 定之透溼度爲1克/平方公尺· 24小時以下之聚合物 所構成，並且根據下式（I )所定義之Re遲滯値係在 0〜100奈米之範圍，而且根據下式（Π)所定義的Rth 遲滯値係在70〜500奈米之範圍； (I ) Re = (nx-ny) x d (Π ) Rth = {(nx + ny)/2-nz} x d (式中，nx及ny分別代表在聚合物薄膜平面內之遲相 軸方向及進相軸方向的折射率；而η z則代表在聚合物 薄膜之厚度方向的折射率；以及d代表聚合物薄膜之 200305043 厚度）。 (2) 如（1 )所記載之光學補償薄膜，其中聚合物之比重爲 1 . 2 0以下。 (3) 如（1 )或（2)所記載之光學補償薄膜，其中聚合物爲環 狀聚烯烴。 (4 )如（3 )所記載之光學補償薄膜，其中使聚烯烴爲四環 十一烯類之開環聚合物、或者四環十二烯類及正萡烯 類之開環共聚物進行加氫反應所得到的聚合物。 (5 )如（1 )至（4 )中任一項所記載之光學補償薄膜，其中聚 合物係包括具有至少二個芳香族環之芳香族化合物 〇 (6 )如（5 )所記載之光學補償薄膜，其中芳香族化合物係 具有1，3,5-三吖畊環之化合物。 (7) 如（1 )至（6)中任一項所記載之光學補償薄膜，其中聚 合物薄膜係含有高熱傳導性粒子，且其熱傳導率爲 1 W / ( m · K)以上。 (8) 如（1 )至（6)中任一項所記載之光學補償薄膜，其中在 聚合物薄膜之至少一側之表面上，係設置一含有高熱 傳導性粒子的熱傳導層，且該具有熱傳導層的聚合物 薄膜之熱傳導率爲1W/(m· K)以上。 (9) 如（1 )至（8)中任一項所記載之光學補償薄膜，其中液 晶性化合物係爲碟狀液晶性化合物。 (1 0 )如（1 )至（9 )中任一項所記載之光學補償薄膜，其中聚 -10- 200305043 合物薄膜係經拉伸而成。 (1 υ —種偏光板，其係由偏光膜、及配置在其兩側上的二 枚透明保護膜所構成；其中透明保護膜中之至少一枚 係爲如（1)至（1 〇)中任一項所記載之光學補償薄膜。 (1 2 ) —種影像顯示裝置，其係具有二枚偏光板、挾持前述 二枚偏光板之液晶晶胞、以及至少一枚之挾持前述偏 光板和前述液晶晶胞的如（1)至（10)中任一項所記載 之光學補償薄膜。 (1 3 )如（1 2 )中任一項所記載之影像顯示裝置，其中液晶晶 胞係爲T N模式或Ο C B模式之液晶晶胞。 【發明之實施態樣】 以下，詳細地說明本發明。又，在本說明書中之「至 (〜）」前後所記載的數値係表示包括個別之最小値及最大 値之範圍。 【光學補償薄膜】 本發明之光學補償薄膜係由包括聚合物薄膜與液晶 性化合物之光學各向異性層積層而成。以下，說明在本發 明之光學補償薄膜中所可能使用的各種材料及其製造方 法。 可用於前述聚合物薄膜中之聚合物，其在633毫米波 長之光彈性係數爲1 〇 X 1 〇.12平方公尺/牛頓以下，而且依 照J IS Z0 2 08試驗法所測定之透溼度爲]克/平方公尺· 24小時以下。使用光彈性係數及透溼度在前述範圍之聚 -11- 200305043 合物時，於高溫高溼之環境下使用的情況下，將可以減輕 所生成的光學特性之變化，而成爲耐久性優良的光學補償 薄膜。在本發明中所使用的聚合物，其光彈性係數較宜是 7 X 1 0_12平方公尺/牛頓。在本發明所使用的聚合物之前述 透溼度，較宜是0.6克/平方公尺· 24小時。 又在本發明中，透溼度之測定係使用JIS Z02 08試驗 法，並且以厚度爲300微米之聚合物做爲測定對象，於溫 度40°C及相對溼度爲90%之條件下來進行。 在本發明中所使用的聚合物，其比重較宜是在1 .2以 下。使用比重在前述範圍的聚合物時，可繼續地將光學特 性維持在理想之範圍，並可以減少重量，而使得偏光板、 影像顯示裝置輕量化。 使用光彈性係數及透溼度在前述範圍之聚合物的較 佳具體實施例，舉例來說，例如其可以是丙烯酸系樹脂（ 例如，聚甲基丙烯酸酯）、環狀聚烯烴（例如，從J S R市售 可得之安通G、安通DF、從日本芮翁市售可得的芮諾阿 1020R、 1060R' 1420R、 1600R、芮諾克斯 480、 480R 、280R、490R、E48R、E28R、RS820)等。在彼等之中 ，特佳是使用一種含有如芮諾阿之環狀聚烯烴，特別是將 四環十二烯類之開環聚合物、或四環十二烯類與正萡烯類 之開環聚合物予以加氫所得到的聚合物做爲構成成分之 聚合物。意即，在特公平2-9619號及特開平9-263627 號之各公報上詳細記載之四環十二烯（又稱爲二甲醯基-1， -12- 200305043 4，5，8-八氫-1，2，3，4，4a，5，8，8a-萘）類之開環聚合物、 或四環十二烯類與正萡烯類（又稱爲二環-[2 · 2 · 1]-七烯 -2)類之開環聚合物予以加氫所得到的聚合物做爲構成成 分之聚合物，因爲吸溼性極佳、透明性、成形加工性、耐 水性均優，故爲特佳。在此種聚合物中之四環十二烯構造 的比例，依照耐熱性之觀點來看，通常是5 0莫耳。/。以上 ，較宜是在8 0莫耳％以上，特佳是在9 0莫耳。/。以上；而 聚合物之分子量係可以在開環聚合時添加烯烴或環烯烴 等而調節之，一般來說是1000〜50萬，較宜是1萬〜10 萬。 聚合物薄膜係可以利用溶液流延法、或熔融製膜法來 製作。依照薄膜之表面外觀來看，以溶液流延法較佳，然 而，依生產性及成本之觀點來看，不使用溶劑之熔融製膜 法較爲優良。在溶液流延法中，係使用一種將聚合物溶解 在有機溶劑中之溶液，來製造薄膜。溶液流延法之乾燥， 大致上可分爲於鼓（或皮帶）表面之乾燥，以及搬送薄膜時 之乾燥。於鼓（或皮帶）表面之乾燥，較宜是以不超過所使 用的溶劑之沸點的溫度（超過沸點時就會發泡）而慢慢地 乾燥。又，搬送薄膜時之乾燥，較宜是以聚合物之玻璃轉 化溫度± 3 0 °C來進行，更宜是在± 2 (TC下進行。前聚合物 薄膜，爲了下述之光學各向異性層，以及同時影像顯示裝 置之光學補償，因而有需要將遲滯値調整在預定之範圍， 又且’爲了防止因熱、應力或不均所引起的影像顯示裝置 -13- 200305043 之光漏，並維持顯示品質，則較宜是將聚合物薄膜之厚度 、熱傳導率、熱膨脹率等予以最適化。 以下，說明有關在本發明中所使用的聚合物之各種特 性的較佳範圍。又且，以溶液流延法所製作的聚合物薄膜 ，如後述那樣，由於其係依照在聚合物溶液之調製中所使 用溶劑之殘留量變化，其特性也會著變化，故也將於以下 說明有關溶劑之殘留量的較佳範圍◊ 在本發明中，聚合物之厚度較宜是40〜100微米。 在本發明中，Re遲滯値和Rth遲滯値係分別根據下 式（I )和式（n )定義： (I ) Re = (nx-ny) x d (Π ) Rth = {(nx+ny)/2-nz} x d 式中，nx及ny係分別代表在聚合物薄膜平面內之遲相 軸方向及進相軸方向的折射率；而nz則代表在聚合物薄膜 之厚度方向的折射率；以及d代表聚合物薄膜之厚度。 在本發明中，係將Re遲滯値調整在0〜100奈米之範 圍；並將Rth遲滯値調整在70〜500奈米之範圍。 將二枚之本發明之光學補償薄膜使用於T N模式之液 晶顯示裝置的情況，聚合物薄膜之Rth遲滯値較宜是在 7 0〜2 50奈米之範圍；在使用一枚光學補償薄膜之情況， 聚合物薄膜之Rth遲滯値較宜是在150〜400奈米之範圍 將二枚之本發明之光學補償薄膜使用於OCB模式之 200305043 液晶顯示裝置的情況，聚合物薄膜之R e遲滯値較宜是在 30〜50奈米，Rth遲滯値較宜是150〜200奈米；在使用一 枚光學補償薄膜之情況，聚合物薄膜之Rt h遲滯値較宜是 50〜100奈米，Rth遲滯値較宜是在300〜500奈米之範圍 〇 將二枚之本發明之光學補償薄膜使用於TN模式之液 晶顯示裝置的情況，聚合物薄膜之之範圍；在用一枚光學 補償薄膜之情況，聚合物薄膜之之範圍。 在本發明中，爲了調整聚合物薄膜之Re遲滯値和Rth 遲滯値，則較宜是使用後述之遲滯値控制劑。可使用來做 爲遲滯値控制劑，係包括溶解在聚合物中及/或分散薄膜 中者。 在本發明之聚合物薄膜中，如上述那樣，係可以使之 含有遲滯値控制劑。前述之遲滯値控制劑，係用來將聚合 物薄膜之遲滯値調整在預定之範圍內。可做爲前述之遲滯 値控制劑，較宜是使用一種具有至少二個芳香族環之芳香 族化合物。在本說明書中所使用之「芳香族環」的意義， 係包括於添加有芳香族烴環之芳香族雜環。前述之芳香族 化合物，較宜是記載於特開2001 -1 66 1 44號公報上之由 碟狀化合物所形成的纖維素酯薄膜用遲滯値控制劑。又且 ，遲滯値上是劑之分子量，較宜是300〜800。 前述遲滯値控制劑，相對於1 0 0質量份之聚合物計， 宜是使用〇 _ 〇 1〜2 0質量份範圍；相對於1 〇 〇質量份之聚 -15- 200305043 合物計，較宜是使用〇 . 〇 5〜1 5質量份範圍；更宜是使用 〇 . 1〜1 0質量份範圍。倂用二種類以上之化合物也可以。 在本發明中所使用的聚合物薄膜之熱傳導率，較宜是 1 W/(m · K)。當熱傳導率係在上述之範圍時，則在光學補 償薄膜之面內所生成的溫度分布就可以均一化，因而光學 特性及顯示裝置之光漏就會顯著地減低。熱傳導率愈高愈 好，以後述之添加高熱傳導性粒子之方法而言，一般是在 1 0 W/(m · K)以下者。在本發明中，所謂聚合物薄膜之 傳導率’係爲依照以下所測定之値。也就是說，將聚合物 薄膜挾持在TO-3型加熱盒與銅板之間，予以壓縮薄膜厚 度之1 〇%。接著，以5W之電力施加在銅製加熱盒並保持 4分鐘’測定銅製加熱盒與銅板間之溫度差。將所測定之 溫度差値，利用下式算出熱傳導率。 熱傳導率{ W/(m· K)} = {電力（W)x厚度（m)}/{溫度差 (K)x測定面積（m2)} 爲了控制前述之聚合物薄膜之熱傳導率，在聚合物薄 膜中較宜是含有高熱傳導性粒子。又且，爲了控制熱傳導 率’也可以在聚合物薄膜之一側表面上，另外設置一含有 高熱傳導性粒子的熱傳導層。該含有高熱傳導性粒子的熱 傳導層’也可以是與聚合物共流延而設置，並且將含有前 述粒子的塗布液塗布在聚合物薄膜而設置也可以。可以使 用的高熱傳導性粒子，舉例來說，例如其可以是氮化鉻、 氮化矽、氮化硼、氮化鎂、碳化矽、氧化氧化矽、氧化鋅 -16· 200305043 、氧化鎂、碳、金剛石、以及金屬等。爲爲不損及薄膜之 透明性，較宜是使用透明的粒子。高熱傳導性粒子之平均 粒徑較宜是在0.05〜8◦微米之範圍，更宜是在〇」〜10微 米之範圍。又且，也可以使用球狀粒子，使用針狀之粒子 也可以。 添加在聚合物薄膜中之高熱傳導性粒子的量，相對於 100質量份之聚合物計，較宜是5〜100質量份之範圍。當 添加量不足5質量份時，熱傳導之提昇就會不足，又且， 當超過5 0質量份時生產性就會不良，而使得聚合物有脆 化之傾向。 在本發明中所使用的聚合物薄膜，吸溼膨脹係數較宜 是在30x1CT5/%RH以下，較宜是在15X1(T5/%RH以下 ，更宜是在10X1(T5/%.RH以下。當吸溼膨脹係數係在前 述之範圍內時，即使是在局淫下使用的情況也可以減輕聚 合物薄膜之不均一，也可以防此在高溼下使用情況的情況 之條塊狀Z光漏（穿透癣上昇）。尙且，雖然吸淫膨脹係數 是愈小愈好，但通常是在1.0 X 1 〇 ·5 / % R Η以上之値。 吸溼膨脹係數於一定溫度下隨著閜對溼度而變化時 ，係表示該試料長度之變化量。具體而言，將聚合物薄膜 切割成寬度5毫米、長度2 0毫米之試料，將單側之端點 予以固定並掛在25°C、20%RH(RQ)之周圍環境下。男〜 端則負荷〇_5克重，放置10分鐘，勣量其長度（L。）。接 著，溫度仍爲2 5 0 °C，於溼度爲8 0 % R H ( R J，測定其長度 200305043 (LJ。吸溼膨脹係數則可以由該測定値依下式而算出。對 同一試料進行1 0個試樣之測定，採用其平均値。 吸溼膨脹係數[/%RH] = 4。）/1&gt;。}/(!^-卩0) 根據本發明人之檢討，爲了使聚合物薄膜因吸溼而起 的尺寸變化變小，可瞭解若是能使聚合物薄膜中之自由體 積變小的話較佳。能對此種自由體之大小賦予大的影響者 ，就溶液流延法而言，製膜後殘留在聚合物中所殘留的調 製聚合物溶液（塗布液）用的溶劑之殘留量。減少殘留溶液 用之一般手段，係在塗布液流延製膜之後，以高溫且長時 間地乾燥，然而以不太長的時間乾燥時，當然也就使得生 產性下降。殘得溶劑之量較宜是在〇 · 〇 1〜1質量份之範圍 ;更宜是在 0.02〜0.07質量份之範圍，最好是在 0.03〜0.05質量份之範圍。 在聚合物薄膜中之殘留溶劑量，係可以將一定量之試 料溶解在氯仿中，並使用質體層析儀（GC18A，島津製作 所製）來測定。聚合物薄膜之彈性率較宜是在3000 M pa以 下，更宜是在500Mpa。 就使聚合物薄膜之不均變小而言’藉由將聚合物薄膜 予以拉伸而使聚合物分子面之配向變高，係爲有效的手段 。此外，調整聚合物薄膜之遲滯値也是一種有效的手段。 就使聚合物分子面之配向變高來說，較宜是雙軸拉伸 。雙軸拉伸係有同時雙軸拉伸法及批次雙軸拉伸法，然而 依連續製造的觀點來看，較宜是批次雙軸拉伸方法，於塗 200305043 布液流延之後’以皮帶或鼓將薄膜予以剝離，將寬度方向 (長軸方法）拉伸之後，再拉伸長軸方向（寬度方向）。拉伸 寬度方向之方法，例如於特開6 2 -1 1 5 0 3 5號、特開平4 -1 52 1 25號、特開平4-2 8421 1號、特開平4-29831 0號、 特開平1 1 - 4 8 2 7 1號等各公報上所記載者。拉伸是在常溫 或加熱條件下實施。加熱溫度較宜是在薄膜之玻璃轉化溫 度以下。 在以溶液流延來製做聚合物薄膜之情況，也可以在製 膜後於乾燥步驟中進行拉伸。特別是在殘存溶劑之情況也 是有效的。於長軸方向拉伸之情況下，例如，可調節薄膜 搬送輥之速度，並且依照薄膜剝離速度、亦或依照捲曲速 度等方面而加速、連續地拉伸。在拉伸寬度方向的情況， 邊保持薄膜之巾於拉幅機上並邊搬送，然後可以使拉幅機 上之巾慢慢地變大而拉伸。也可以在乾燥薄膜之後，使用 拉伸機予以拉伸（較宜是使用長拉伸機予以單軸拉伸）。薄 膜之拉伸倍率（相對於原來長度之因拉伸所增加分量之比 率）較宜是5〜50%，更宜是1 0〜40%，最好是1 5〜35%。 從流延到乾燥之步驟，也可以是在空氣周圍環境下進 行，並且也可以是在氮氣氣體等之鈍性氣體周圍環境下進 行。 在本發明中所使用的聚合物薄膜，可以於製造之後， 保存在捲曲之狀態並搬送。所使用的捲曲機，可以使用一 般所使用之物來進行捲曲，並以定張力法、定力矩法、帶 -19- 200305043 式拉伸法、定內應力之程式拉伸控制法等捲曲方法來進行 捲曲。 在本發明中所使用的聚合物薄膜，爲了設置後述之含 有液晶性化合物之光學各向異性層，較宜是實施表面處理 。具體的方法，舉例來說，例如電暈放電處理、輝光放電 處理、火炎處理、酸處理、鹼性處理或紫外線照射處理。 又’依照特開平7- 3 3 3 4 3 3號公報上之記載，較宜是設置 底塗層。 依照保持薄膜之平面性的觀點來看，此種表面處理之 溫度宜是在聚合物薄膜之T g (玻璃轉化溫度）以下，具體而 言，較宜是在170 °C以下。 在本發明中所使用的聚合物薄膜之表面能，較宜是在55 毫牛頓/公尺以上，更佳爲60毫牛頓/米至75毫牛頓/米。固 體之表面能係可藉於「潤溼之基礎應用」（理解出版公司， 1 9 8 9年1 2月1 0日發行）所敘述之接觸角法、濕熱法或吸附 法來測量。在本發明之聚合物薄膜的情況下，以使用接觸角 法較佳。具體來說，係將2種已知表面能之溶液滴在纖維素 乙酸酯膜上，以按照液滴之表面與薄膜表面之交點，引拉接 於液滴之切線與膜表面間所形成的角，將包含液滴方向之角 度定義爲接觸角，再藉以計算膜之表面能。 本發明之光學補償薄膜，雖然是在所製做的聚合物薄 膜上積層一由液晶性化合物所形成的光學各向異性層，然 而進行表面處理之聚合物薄膜時，於設置在其上之光學各 -20- 200305043 向異性層間，較宜是設置配向膜。配向膜係可以使得所使 用的液晶性化合物配置成一定方向之配向。從而，在製造 本發明之光學補償薄膜中，配向膜雖然是必需的，然而在 將液晶性化合物予以配向後，若將之固定在配向狀態的話 ，則沒有配向膜也可以。也就是說，配向膜並不是光學補 償薄膜的必要構成要素；又，可以僅將配向狀態爲固定的 配向膜上之光學各向異性層，予以轉印在聚合物薄膜上來 製造光學補償薄膜。 配向膜係一種具有規定液晶性化合物之配向方向的 功能。配向膜是可以藉有機化合物（較佳爲聚合物）之摩擦 處理、無機化合物之斜方處理、形成具有微溝紋之層，或 者利用蘭格密阿·伯洛迪特法（L B膜）所累積有機化合物（ 例如，ω -二十三酸、雙八癸基甲基氯化銨、十八酸甲酯） 等手段來設置。在本發明中，配向膜較宜是藉由聚合物之 摩擦處理來形成。 配向膜較宜是聚乙烯醇衍生物。特佳者爲在其中結合 有疏水性基之改性聚乙烯醇。配向膜雖然是可以由一種之 聚合物來形成’然而也可以是藉由摩擦處理經交聯的二種 類聚合物所形成的層來形成。至少一種類的聚合物，乃是 可自我交聯之聚合物’或者藉由交聯而交聯的聚合物，較 宜是使用其中之任一者。配向膜係可將具有官能基之聚合 物或將官能基導入聚合物中，藉由光、熱、ρ Η等變化而 在聚合物間形成反應；或者是使用反應活性高的交聯劑並 -21- 200305043 將由交聯劑而來的鍵導入聚合物間，藉著聚合物間之交聯 作用製作而得。 配向膜之交聯反應，係藉由將含有上述之聚合物或含 有聚合物與交聯劑之混合物的配向膜塗布液，塗布於聚合 物薄膜上，然後依照期望之加熱等來實施。爲了在最終商 品階段能確保其耐久性爲優良之原故，將配向膜塗設於透 明支撐體上之後到得到最終光學補償片爲止之任一階段 中來進行交聯處理也可以。當考慮具有形成於配向膜上之 圓盤狀構造之化合物（光學各向異性層）之配向性時，也 可以在將具有圓盤狀構造之化合物予以配向之後，再充分 地進行交聯反應。配向膜之交聯反應，一般係將配向膜塗 布液塗布於聚合物薄膜上，並進行加熱乾燥。較宜是將此 種塗布液之加熱溫度設定低點，然後於形成光學各向異性 層之際，在加熱處理之階段中使配向膜進行充分之交聯。 配向膜較宜是如日本專利第2587398號公報上所記載之 物。 配向膜之厚度較佳爲0 · 1至1 0微米。加熱乾燥係可 以2 0至1 1 0 °C之加熱溫度來進行。爲了充分形成交聯， 溫度較佳爲60至100°C，更佳爲80至1〇〇°C。乾燥時間 可以1分鐘至36小時來進行，較佳爲5分鐘至30分鐘 。亦且，P Η較佳爲依照所使用之交聯劑而設定於最適値 。在使用戊二醛做爲交聯劑之情形下，則pH較佳爲4.5 至5.5，特佳爲5。 200305043 摩擦處理係可以利用在LCD液晶之配向處理工程中 所廣爲採用之處理方法來進行。也就是說，配向膜之表面 ，係可以藉由使用紙、布、氈毛、橡膠或耐綸、聚酯纖維 等在一定方向上摩擦而予以配向。一般而言，其也可以藉 由使用長度與粗細均一之纖維均勻植毛而成之布等摩擦 數次來實施。 在本發明中，由液晶性化合物形成的光學各向異性層 ，較宜是形成在設置於聚合物薄膜上之配向膜上。 就用於光學各向異性層上之液晶性化合物而言，係包 括棒狀液晶性化合物及圓盤狀液晶性化合物，其可以是高 分子液晶，也可以是低分子液晶，更且，低分子液晶也包 括不顯示經交聯的液晶性。在彼等之中，理想上係爲圓盤 狀液晶性化合物。 在前述光學各向異性層中，較佳是使用圓盤狀液晶性化 合物。圓盤狀化合物係包括碟狀液晶。光學各向異性層係爲 將含有圓盤狀液晶性化合物、及後述之聚合起始劑及任意的 添加劑（例如，可塑劑、單聚物、界面活性劑、纖維素酯、 1,3,5-三吖畊化合物、螫合劑）的液晶化合物（塗布液），予以 塗布在配向膜之上，藉由將圓盤動液晶性化合物予以配向製 作而得。 可做爲圓盤狀（碟狀）液晶性化合物之實例，其係包括 C. Destrade等人之硏究報告，於Mo卜Cryst.第71卷， 第111頁（1981年）所記載之苯衍生物；c.Destrade等人 200305043 之硏究報告，於Mol. Cryst.第122卷，第141頁（1985 年），Physics lett，A，第78卷，第82頁（1990)所記載之 三茚并苯衍生物；B. Kohn等人之硏究報告，於Angew. Chem.第96卷，第70頁（1 984年）所記載之環己烷衍生物 ;及」· M· Lehn等人之硏究幸艮告，方令J. Chem. Commun· 第1794頁（1985年），與J. Zhang等人之硏究報告，於 J. Am. Chem. Soc.第 1 1 6 卷，第 2655 頁（1 994 年）所言己 載之氮冠型或苯基乙炔型巨環化合物。更且，圓盤狀液晶 性化合物，一般而言，其係具有一種以此等做爲分子中心 之母核，並以直鏈之烷基、烷氧基、以取代苯甲醯基爲其 直鏈再以放射狀地取代之結構，而顯示出液晶性。但是， 分子本身係具有負的單軸性，而且賦予預定配向之物並沒 有特別地限定爲上述所記載之物而己。 又且，在本發明中，從碟狀化合物形成光學各向異性 層時，並不需要始終是上述化合物；例如，前述具有熱或 光反應性基之低分子量碟狀液晶化合物，最終將因熱或光 等之反應而聚合或交聯劑，並形成失去液晶性之高分子量 化物質。爲利用將圓盤狀液晶性化合物予以聚合而固定， 則圓盤狀液晶性化合物之圓盤狀之中心上，就有需要結合 一聚合性基以做爲取代基。但是圓盤狀之中心與聚合性基 間，較宜是導入伸長物（連結基）。圓盤狀液晶性化合物之 較佳實例，係如於日本專利特開平第8 - 5 0 2 0 6公報中所記 載者；又關於圓盤狀液晶性化合物之聚合，係記載於特開 -24- 200305043 8-27284號公報中。 在本發明中，圓盤狀液晶性化合物之圓盤面與聚合物 薄膜面間之角度（傾斜角），係會隨著光學各向異性層之 深度方向而不同。也就是說，傾斜角係隨著自光學各向異 性層底部起之距離增加而變化；此種變化舉例來說，例如 有連續增加、連續減小、斷續增加、斷續減小、含連續增 加與減小之變化、及包括增加或減小之斷續變化。斷續變 化係包括傾斜角在層厚度方向路線不改變之區域。傾斜角 ，係包括傾斜角不變化之區域，較佳爲在層中全部增加或 減小。傾斜角更佳爲在層中完全增加，而且特佳爲連續地 變化。 配向膜側之圓盤狀單位之傾斜角，一般係可以藉由選 擇圓盤狀液晶性化合物或配向膜之材料，或者藉由選擇摩 擦處理方法來調整。又且，在表面側（空氣側）上圓盤狀 單位之傾斜角，一般來說，通常可藉由選擇圓盤狀液晶性 化合物或與圓盤狀液晶性化合物一起使用之其他化合物 而予以調整。可與圓盤狀液晶性化合物同時使用之化合物 的例子，舉例來說，例如是塑化劑、表面活化劑、可聚合 單聚物與聚合物。更且，傾斜角之變化程度亦可藉由以上 之選擇而予以調整 前述光學各向異性層也可以含有圓盤狀液晶性化合 物以外的其他添加劑。可與上述圓盤狀液晶性化合物同時 使用之塑化劑、表面活化劑及可聚合單聚物者，只要是與 -25- 200305043 碟狀化合物具有相溶性，並能賦予碟狀化合物變化之傾斜 角，或者不妨害配向者即可，任何此種化合物均可以使用 。此等之中，以可聚合單聚物（例如，具有乙烯基、乙烯 氧基、丙烯醯基、或甲基丙烯醯基之化合物）較佳。上述 化合物之添加量，相對於圓盤狀液晶性化合物計，一般是 1至50重量％，更宜是5至30重量％。此外，當與反應 性官能基之數量爲4個以上之單聚物混合使用時，將可以 提高配向膜和光學各向異性層間之密著性。 在本發明中，光學各向異性層，一般來說，通常係將 圓盤狀液晶性化合物與其他的化合物溶於溶劑中所形成 之溶液塗覆於配向層上，並予以乾燥，接著再加熱至碟狀 向列相之形成溫度爲止，然後保持在配向狀態（碟狀向列 相）使之冷卻而製得。或者，上述光學各向異性層係藉由 將圓盤狀液晶性化合物與其他的化合物（例如，可聚合單 聚物、光聚合引發劑）溶於溶劑中形成之溶液塗覆於配向 層上，使之乾燥，再加熱（例如，藉U V光輻射）至碟狀 向列相之形成溫度後再使之聚合，進一步冷卻而製得。 在本發明中所使用的圓盤狀液晶性化合物之碟狀向 列相一固相轉移溫度，較佳爲7 0至3 0 0 °C，特別是7 0至 1 7 0°C。 在本發明中，經配向的液晶性化合物，較宜是維恃固 定。固定化則較宜是藉聚合反應來實施。聚合反應係包括 使用熱聚合起始劑之熱聚合反應，以及使用光聚合起始劑 -26- 200305043 之光聚合反應；然而以光聚合反應較佳。光聚合起始劑之 實例，係包括α -羰基化合物（美國專利第2367661號、美 國專利第2367670號各說明書之記載）、偶因醚（美國專利 第2 448 828號說明書之記載）、α -羥取代芳香族偶因化合 物（美國專利第272251 2號說明書之記載）、多核醌化合物 (美國專利第3046127號、美國專利第2951758號各說明 書之記載）、三芳基咪唑二聚物與Ρ-胺基苯酮之組合（美國 專利第3 5 4 9 3 6 7號說明書之記載）、ΡΥ啶及吩畊化合物（ 特開昭第60-105667號、美國專利第4239850號各說明 書之記載）、以及噚二偶氮化合物（美國專利第42 1 2970 號說明書之記載）等等。 光聚合起始劑之使用量，較宜是塗布液中固體分之 0.01〜20質量份，更宜是0·5~5質量份。 照射能較宜是 20毫焦耳/平方公分，更宜是是 100〜800毫焦耳/平方公分。又且，爲了促進光聚合反應 ，也可以在加熱條件下實施光照射。 如以上之做法，藉由將光學各向異性層設於聚合物薄 膜上，將可以製做成本發明之光學補償薄膜。也可以在光 學各向異性層上方設置保護層。本發明之光學補償薄膜係 可以使用來做爲偏光板之組件、及影像顯示裝置之組件。 特別是使用於液晶顯示裝置時，將有助於改善視角。更且 在影像顯示裝置使用於嚴酷條件下（外力負荷、高溫度、 高溼度）的情況’將有助於減輕起因於光漏之顯示品質下 -27- 200305043 降。更且，在使用於偏光板及影像顯示裝置的情形，將有 助於彼等之薄化及輕量化。特別是，本發明之光學補償薄 膜，單獨地或以和偏光膜貼合而做爲偏光板之形態而用於 影像顯示裝置，特別是穿透型液晶顯示裝置。 以下，就適用於偏光板及影像顯示裝置上之本發明之 光學補償薄膜的實施形態分別予以說明。 【偏光板】 本發明之偏光板的實施形態之一，係一種由偏光膜及 在其兩側上配置二枚透明保護薄膜所構成之偏光板；且係 一種具有該透明保護薄膜中之至少一者爲本發明之光學 補償薄膜的偏光板。僅有一方之保護膜使用本發明之光學 補償薄膜也可以’又使用本發明之光學補償薄膜來做爲雙 方之保護膜也可以。在做成有一方的保護膜的態樣，另一 方之保護膜係可以使用一般的纖維素乙酸酯薄膜。 可做爲本發明之偏光膜者，其係可以使用碘系偏光薄膜 、使用雙色性染料之染料系偏光薄膜、及聚烯系偏光薄膜中 之任一者。碘系偏光薄膜及染料系偏光薄膜，通常是使用聚 乙烯醇膜製造而得。 又’就偏光板之耐久性而言，保護膜之耐久性（耐溫 淫熱性）係重要的。也就是說，因影像顯示裝置之使用條 件（高淫下），使得水分進入偏光膜中時就會使偏光能力下 降。可做爲本發明之光學補償薄膜的聚合物薄膜，較宜是 使用一種透溼度在預定範圍的聚合物所形成的聚合物薄 -28- 200305043 膜。構成本發明光學補償薄膜的聚合物薄膜，係由四環十 一*嫌類之開環聚合物、或四環十二烯類與正蓝嫌類之開環 聚合物予以加氫所得到的聚合物構成時，透溼性就會顯著 地降低，因而成爲偏光板之較佳的保護膜。 【影像顯示裝置】 本發明之影像顯示裝置的實施形態之一，係一種由二 枚之偏光板、挾持前述二枚偏光板之液晶晶胞、及至少一 枚之挾持前述偏光板和前述液晶晶胞的本發明之光學補 償薄膜之影像顯示裝置，較宜是液晶顯示裝置，更宜是穿 透型液晶顯示裝置。前述之偏光板係由偏光膜及在其兩側 上配置二枚透明保護薄膜所構成之偏光板。本發明之光學 補償薄膜，係可以一枚配置在液晶晶胞及一方之偏光板之 間，或者是以二枚配置在液晶晶胞及雙方之偏光板之間也 可以。前述之液晶晶胞係在二枚電極基板間擔持有液晶。 本發明之光學補償薄膜係可以和各種模式之液晶一 起組合來使用；例如，可以和Τ N模式、〇 C B模式組合來 使用。 四、實施方式 【實施例】 列舉以下之實施例藉以進一步說明本發明。在以下實施 例中所示之材料、試葯、比例、操作等，在不脫離本發明之 精神範圍內，係可以有限度適當地變更。然而，本發明之範 圍並不僅限於以下所示之具體實施例而已。 - 29- 200305043 【實施例1】 (聚合物薄膜之製作） 將由100質量份之「芮諾阿1020R」（日本芮翁製）、及 2 0 0質量份之二氯甲烷所構成的組成物投入混合槽中’邊加 熱邊攪拌而調製成聚合物溶液。另外的混合槽中，則投入由 1 6質量份之以下式所代表之遲滯値控制劑、及1 〇〇質量份 之二氯甲烷所構成的組成物，邊加熱邊攪拌而調製成遲滯値 控制溶液。將474質量份之此種聚合物溶液對63質量份之 遲滯値控制劑予以混合，並充分地攪拌而調製成塗布液。相 對於1 〇 〇質量份之聚合物計，遲滯値控制劑之添加量係爲 5.5質量份。 遲滯値提昇劑200305043 玖:,: Dirty description (The description of the invention should state the technical field to which the invention belongs, the prior art, the content, the embodiments, and the drawings.) 1. The technical field to which the invention belongs: The present invention relates to a light weight Furthermore, an optical compensation film having excellent durability, and a polarizing plate and an image display device capable of removing it. 2. Previous technology: Compared with CRT, liquid crystal display devices have thinner, lighter, and lower power consumption characteristics, so they have been widely used in notebook personal computers, display screens, TV, PDA, mobile phone, car tracker, video recorder, camera, etc. However, in the current mainstream TN-mode liquid crystal display devices, problems in view angle characteristics such as changing display colors and contrast in accordance with the viewing direction occur in principle. In order to improve such viewing angle characteristics and to achieve a liquid crystal display device with improved display quality, Japanese Patent No. 2587398 describes an optical compensation film intermixed with a disc-shaped liquid crystal and interposed between a polarizer and a liquid crystal cell. means. However, according to this method, there is a problem that the liquid crystal display device becomes thicker due to the reason of the optical compensation film and the adhesive. In addition, Japanese Unexamined Patent Publication No. 7-191217 and European Patent No. 091 1 656A2 describe an optical compensation film using an optically anisotropic layer formed by a disc-shaped liquid crystal on a transparent support. The elliptically polarizing plate constituted by a single-sided protective film of the polarizing film, so that the thickness of the liquid crystal display device does not become thick, and the viewing angle can be improved. III. Summary of the Invention: [Problems to be Solved by the Invention] 200305043 However, this optical compensation film is used under severe environments such as high temperature and high humidity, which will cause stress and distortion, and a phase difference is likely to occur there. Due to this phase difference, it can be understood that a frame-like light leakage phenomenon (increased penetration) is generated on the liquid crystal display device, and the display quality of the liquid crystal display device is degraded. Especially in the case of a large-sized liquid crystal display device of 17 inches or more, it is difficult to completely prevent light leakage. In addition, it has been proposed to attach the aforementioned optical compensation film to a polarizing film so as to have a function as a protective film of the polarizing film, and then to make a liquid crystal display device having a simple structure. However, when the optical compensation film is bonded to have the function of a protective film for a polarizing film, in addition to the problems described above, when it is used under high temperature and high humidity, moisture can penetrate the optical compensation film, and the moisture caused by Problems such as further deteriorating the optical characteristics of the polarizing film. Therefore, as for the optical compensation film, it is required to have durability under conditions of high temperature and high humidity that will not degrade the light characteristics, and that it is impervious to moisture. The present invention is made in view of the foregoing problems, and provides an optical system capable of improving the viewing angle when used on an image display device, and at the same time, the image display device can reduce the display quality of light leakage and the like even when used under severe conditions. Compensation film and polarizer. Furthermore, an object of the present invention is to provide an optical compensation film and a polarizing plate which have less change in optical characteristics and have excellent durability when used under severe conditions. Still another object of the present invention is to provide an image display device having a wide viewing angle, which can reduce the display quality due to the light leakage caused by the use under severe conditions, and has excellent durability. [Means to solve the problem] The inventors reviewed the reason why the light leakage system changes the optical characteristics of the optical compensation film 200305043, so they can recognize the following two reasons: One is the harsh use conditions of the image display device (high temperature , High humidity), the polymer film will expand or contract, thus causing changes in the optical characteristics of the optical compensation film; the other is the temperature distribution in the surface of the optical compensation film due to the backlight of the image display device, because Such uneven heat causes changes in optical characteristics. Based on this cognitive discovery and further review of the results, it was found that the relationship between the changes in the optical characteristics of the optically compensated film, the photoelastic coefficient, and the moisture permeability was further and repeatedly reviewed, and the present invention has been completed. The solution of the present invention is as follows. (1) An optical compensation film having an optically anisotropic layer including a liquid crystal compound above a polymer film, characterized in that the polymer film is made of a polymer having a photoelastic coefficient of 1 × 1 ×- Residual hysteresis of 12 square meters / newton or less and a moisture permeability of 1 g / square meter · 24 hours or less measured in accordance with JIS Z0208 test method and defined by the following formula (I) Is in the range of 0 to 100 nanometers, and Rth hysteresis is defined in the range of 70 to 500 nanometers according to the following formula (Π); (I) Re = (nx-ny) xd (Π) Rth = { (nx + ny) / 2-nz} xd (where nx and ny represent the refractive index in the direction of the retardation axis and the axis of the advancement axis in the plane of the polymer film, respectively; and η z represents the refractive index in the polymer film. The refractive index in the thickness direction; and d represents the 200305043 thickness of the polymer film). (2) The optical compensation film according to (1), wherein the specific gravity of the polymer is 1.  Below 2 0. (3) The optical compensation film according to (1) or (2), wherein the polymer is a cyclic polyolefin. (4) The optical compensation film according to (3), wherein the polyolefin is a ring-opening polymer of tetracycloundecene or a ring-opening copolymer of tetracyclododecene and n-pinene. Polymer obtained by hydrogen reaction. (5) The optical compensation film according to any one of (1) to (4), wherein the polymer is an aromatic compound having at least two aromatic rings. (6) The optical device according to (5) A compensation film in which the aromatic compound is a compound having 1,3,5-triazine ring. (7) The optical compensation film according to any one of (1) to (6), wherein the polymer film contains highly thermally conductive particles and has a thermal conductivity of 1 W / (m · K) or more. (8) The optical compensation film according to any one of (1) to (6), wherein a surface of at least one side of the polymer film is provided with a heat conductive layer containing highly thermally conductive particles, and the The thermal conductivity of the polymer film of the thermally conductive layer is 1 W / (m · K) or more. (9) The optical compensation film according to any one of (1) to (8), wherein the liquid crystal compound is a discotic liquid crystal compound. (1 0) The optical compensation film according to any one of (1) to (9), wherein the poly-10-200305043 compound film is stretched. (1 υ — a polarizing plate, which is composed of a polarizing film and two transparent protective films arranged on both sides thereof; wherein at least one of the transparent protective films is as (1) to (1 〇) (1 2) An image display device comprising two polarizing plates, a liquid crystal cell holding the two polarizing plates, and at least one holding the polarizing plate and The optical compensation film according to any one of (1) to (10) in the aforementioned liquid crystal cell. (1 3) The image display device according to any one of (1 2), wherein the liquid crystal cell system is Liquid crystal cell in TN mode or 0 CB mode. [Embodiments of the invention] The present invention will be described in detail below. In addition, the numbers described before and after "to (~)" in this specification indicate that individual numbers are included. The range of the minimum and maximum values. [Optical compensation film] The optical compensation film of the present invention is formed by laminating optically anisotropic layers including a polymer film and a liquid crystal compound. Hereinafter, the optical compensation film of the present invention will be described. Various possible uses Material and its manufacturing method can be used for the polymer film of a polymer, which is 633 millimeter wavelengths of photoelastic coefficient of 1 X 1 billion billion. It is less than 12 square meters / newton, and the moisture permeability measured according to the J IS Z0 2 08 test method is] g / square meter 24 hours or less. When using a poly-11-200305043 compound with a photoelastic coefficient and moisture permeability in the aforementioned range, when used in a high-temperature and high-humidity environment, the change in the optical characteristics generated can be reduced, and an optical with excellent durability can be obtained Compensation film. The polymer used in the present invention preferably has a photoelastic coefficient of 7 X 1 0-12 m 2 / newton. The aforementioned moisture permeability of the polymer used in the present invention is preferably 0. 6 g / m² · 24 hours. In the present invention, the measurement of moisture permeability is performed using the JIS Z02 08 test method, and a polymer having a thickness of 300 micrometers is used as the measurement object, and the temperature is 40 ° C and the relative humidity is 90%. The specific gravity of the polymer used in the present invention is preferably 1. 2 or less. When a polymer having a specific gravity within the aforementioned range is used, the optical characteristics can be continuously maintained in an ideal range, and the weight can be reduced, so that the polarizing plate and the image display device are reduced in weight. A preferred embodiment using a polymer having a photoelastic coefficient and a moisture permeability in the foregoing ranges, for example, it may be an acrylic resin (for example, polymethacrylate), a cyclic polyolefin (for example, from JSR Commercially available Antong G, Antong DF, Renoir 1020R, 1060R '1420R, 1600R, Renox 480, 480R, 280R, 490R, E48R, E28R, RS820 )Wait. Among them, it is particularly preferable to use a cyclic polyolefin such as Renoir, especially a ring-opening polymer of tetracyclododecenes, or A polymer obtained by hydrogenating a ring-opening polymer as a constituent polymer. This means that tetracyclododecene (also known as dimethylamidino-1, -12- 200305043 4, 5, 8- Ring-opening polymers of octahydro-1, 2, 3, 4, 4a, 5, 8, 8a-naphthalene), or tetracyclododecene and n-pinene (also known as bicyclo- [2 · 2 · 1] -Heptene-2) Hydrogenated ring-opening polymer is a polymer obtained by hydrogenation as a constituent polymer, because it has excellent hygroscopicity, transparency, moldability, and water resistance. Therefore, it is particularly good. The proportion of the tetracyclododecene structure in such a polymer is usually 50 mol from the viewpoint of heat resistance. /. Above, it is more preferable to be more than 80 mole%, and particularly preferred is to be more than 90 mole. /. The molecular weight of the polymer can be adjusted by adding olefins or cycloolefins during ring-opening polymerization. Generally, the molecular weight is 10 to 500,000, and more preferably 10,000 to 100,000. The polymer film system can be produced by a solution casting method or a melt film forming method. From the viewpoint of the surface appearance of the film, the solution casting method is preferable, but from the viewpoint of productivity and cost, the melt film forming method without using a solvent is superior. In the solution casting method, a solution is prepared by dissolving a polymer in an organic solvent to produce a thin film. The drying of the solution casting method can be roughly divided into drying on the surface of the drum (or belt) and drying when transporting the film. Drying on the surface of the drum (or belt), it is better to dry slowly at a temperature not exceeding the boiling point of the solvent used (it will foam when the boiling point is exceeded). In addition, the drying of the film is preferably carried out at a glass transition temperature of the polymer of ± 30 ° C, and more preferably at ± 2 ° C. The front polymer film is for the following optical anisotropy And optical compensation of the image display device at the same time, it is necessary to adjust the hysteresis to a predetermined range, and 'to prevent light leakage of the image display device-13- 200305043 due to heat, stress or unevenness, and In order to maintain the display quality, it is preferable to optimize the thickness, thermal conductivity, thermal expansion coefficient, etc. of the polymer film. Hereinafter, the preferred ranges of various characteristics of the polymer used in the present invention will be described. As will be described later, the polymer film produced by the solution casting method changes its characteristics in accordance with the residual amount of the solvent used in the preparation of the polymer solution, so the characteristics of the solvent will also be described below. The preferred range of the residual amount ◊ In the present invention, the thickness of the polymer is more preferably 40 to 100 microns. In the present invention, the Re hysteresis 値 and Rth hysteresis 値 are based on the following formula (I) and (N) Definition: (I) Re = (nx-ny) xd (Π) Rth = {(nx + ny) / 2-nz} xd where nx and ny represent the delay in the plane of the polymer film, respectively. Refractive index in the phase axis direction and the progressive axis direction; nz represents the refractive index in the thickness direction of the polymer film; and d represents the thickness of the polymer film. In the present invention, the Re hysteresis 値 is adjusted to 0 ~ 100 nm range; and adjust the Rth hysteresis to 70 ~ 500 nm. When two optical compensation films of the present invention are used in a TN mode liquid crystal display device, the Rth hysteresis of the polymer film is smaller. It is preferably in the range of 70 to 2 50 nanometers; in the case of using one optical compensation film, the Rth hysteresis of the polymer film is more preferably two optical compensations of the present invention in the range of 150 to 400 nanometers. When the film is used in the 200305043 liquid crystal display device of the OCB mode, the Re hysteresis of the polymer film is preferably 30 to 50 nm, and the Rth hysteresis is preferably 150 to 200 nm. When using an optical compensation film In the case, the Rt h hysteresis of the polymer film is preferably 50 to 100 nm, and the Rth値 It is more suitable in the range of 300 ~ 500 nm. In the case of using two optical compensation films of the present invention in a TN mode liquid crystal display device, the range of polymer films; in the case of using one optical compensation film In the present invention, in order to adjust the Re hysteresis and Rth hysteresis of the polymer film, it is more suitable to use the hysteresis control agent described later. It can be used as a hysteresis control agent. This includes those dissolved in a polymer and / or a dispersed film. As described above, the polymer film of the present invention can contain a hysteresis control agent. The aforementioned hysteresis control agent is used to adjust the hysteresis of a polymer film within a predetermined range. As the aforementioned hysteresis control agent, it is preferable to use an aromatic compound having at least two aromatic rings. The meaning of the "aromatic ring" used in the present specification includes an aromatic heterocyclic ring to which an aromatic hydrocarbon ring is added. The aforementioned aromatic compound is more preferably a hysteresis control agent for a cellulose ester film formed from a dish-like compound described in JP 2001-1 66 1 44. Moreover, the molecular weight of the agent is on the hysteresis, preferably 300 ~ 800. The aforementioned hysteresis control agent is preferably used in the range of 0.001 to 20 parts by mass relative to 100 parts by mass of the polymer; compared to 100 parts by mass of the poly-15-200305043 compound, It is advisable to use 0.  〇 5 ~ 15 parts by mass; more preferably 〇.  1 to 10 parts by mass. It is also possible to use two or more kinds of compounds. The thermal conductivity of the polymer film used in the present invention is preferably 1 W / (m · K). When the thermal conductivity is in the above range, the temperature distribution generated in the surface of the optical compensation film can be uniformized, and the optical characteristics and light leakage of the display device can be significantly reduced. The higher the thermal conductivity, the better. The method of adding highly thermally conductive particles described below is generally below 10 W / (m · K). In the present invention, the "conductivity" of the polymer thin film is measured as follows. That is, the polymer film is held between the TO-3 heating box and the copper plate, and the thickness of the film is compressed by 10%. Next, a 5W power was applied to the copper heating box and held for 4 minutes' to measure the temperature difference between the copper heating box and the copper plate. The measured temperature difference was calculated by the following formula. Thermal conductivity {W / (m · K)} = {electricity (W) x thickness (m)} / {temperature difference (K) x measured area (m2)} In order to control the thermal conductivity of the aforementioned polymer film, It is preferable that the material film contains highly thermally conductive particles. Further, in order to control the thermal conductivity ', a heat conductive layer containing highly thermally conductive particles may be additionally provided on one side surface of the polymer film. The heat-conducting layer containing the highly heat-conductive particles may be provided by co-casting with a polymer, or may be provided by applying a coating solution containing the particles to a polymer film. Highly thermally conductive particles that can be used, for example, they can be chromium nitride, silicon nitride, boron nitride, magnesium nitride, silicon carbide, silicon oxide, zinc oxide-16 · 200305043, magnesium oxide, carbon , Diamond, and metal. In order not to impair the transparency of the film, it is preferable to use transparent particles. The average particle size of the highly thermally conductive particles is preferably 0. The range from 05 to 8 microns is more preferably from 0 to 10 microns. Further, spherical particles may be used, and needle-shaped particles may be used. The amount of the highly thermally conductive particles added to the polymer film is preferably in the range of 5 to 100 parts by mass based on 100 parts by mass of the polymer. When the added amount is less than 5 parts by mass, the improvement in heat conduction is insufficient, and when it exceeds 50 parts by mass, productivity is poor, and the polymer tends to become brittle. The polymer film used in the present invention, the moisture absorption expansion coefficient is preferably 30x1CT5 /% RH or less, more preferably 15X1 (T5 /% RH or less, and more preferably 10X1 (T5 /%. Below RH. When the coefficient of hygroscopic expansion is within the aforementioned range, the unevenness of the polymer film can be reduced even in the case of use under local prostitution, and the block-shaped Z-ray can be prevented in the case of use under high humidity. Leaks (penetrating tinea rise). Moreover, although the smaller the coefficient of sexual expansion, the better, but usually it is 1. 0 X 1 〇 · 5 /% R Η more than 値. When the coefficient of hygroscopic expansion changes with the relative humidity at a certain temperature, it indicates the amount of change in the length of the sample. Specifically, the polymer film was cut into a test piece having a width of 5 mm and a length of 20 mm, and the end points on one side were fixed and hung in a surrounding environment of 25 ° C and 20% RH (RQ). The male to the end is loaded with a weight of 0-5 grams and left for 10 minutes to accumulate its length (L.). Next, the temperature was still 250 ° C, and the humidity was 80% RH (RJ, and the length was measured 200305043 (LJ. The coefficient of hygroscopic expansion can be calculated from the measurement according to the following formula.) 1 0 For the measurement of each sample, the average 値 is used. Moisture expansion coefficient [/% RH] = 4.) / 1 &gt;.} / (! ^-卩 0) According to the review by the inventors, It is understood that the dimensional change caused by moisture absorption is small, and it is understood that it is better to make the free volume in the polymer film smaller. Those who can give a large influence to the size of this free body, as for the solution casting method, Residual amount of solvent used to prepare polymer solution (coating solution) remaining in the polymer after film formation. The general method for reducing the residual solution is after the coating solution is cast into a film at high temperature and for a long time. Drying, however, when drying for a not too long time, of course, it will reduce productivity. The amount of residual solvent is more preferably in the range of 〇1 ~ 1 parts by mass; more preferably in the range of 0. 02 ~ 0. The range of 07 parts by mass is preferably 0. 03 ~ 0. 05 parts by mass. The amount of residual solvent in the polymer film can be determined by dissolving a certain amount of sample in chloroform and using a mass chromatograph (GC18A, manufactured by Shimadzu Corporation). The elasticity of the polymer film is preferably less than 3000 Mpa, and more preferably 500Mpa. In order to reduce the unevenness of the polymer film, it is an effective means to increase the orientation of the polymer molecular surface by stretching the polymer film. In addition, adjusting the hysteresis of the polymer film is also an effective method. As far as the orientation of the molecular surface of the polymer is increased, biaxial stretching is preferred. The biaxial stretching system includes a simultaneous biaxial stretching method and a batch biaxial stretching method. However, from the viewpoint of continuous manufacturing, a batch biaxial stretching method is preferred. After coating 200305043, the cloth is cast. After the film is peeled off with a belt or a drum, and stretched in the width direction (long axis method), the film is stretched in the long axis direction (width direction). The method of stretching the width direction is, for example, JP 6 2 -1 1 5 0 3 5; JP 4-4 52 1 25; JP 4-2 8421 1; JP 4-29831 0; Documented in various publications such as Kaiping 1 1-4 8 2 7 1. Stretching is performed under normal temperature or heating conditions. The heating temperature is preferably below the glass transition temperature of the film. When a polymer film is produced by solution casting, it may be stretched in a drying step after the film is formed. This is effective especially in the case of a residual solvent. In the case of stretching in the long axis direction, for example, the speed of the film conveying roller can be adjusted, and the film can be accelerated and continuously stretched according to the film peeling speed or the curling speed. In the case of stretching in the width direction, the tissue on the tenter can be gradually enlarged and stretched while holding the film on the tenter and carrying it. It is also possible to stretch after stretching the film using a stretcher (preferably using a long stretcher for uniaxial stretching). The stretch ratio of the film (the ratio of the original length to the amount added by stretching) is preferably 5 to 50%, more preferably 10 to 40%, and most preferably 15 to 35%. The steps from casting to drying may be performed in the surrounding environment of air, or may be performed in the surrounding environment of an inert gas such as nitrogen gas. The polymer film used in the present invention can be stored in a curled state after being manufactured and transported. The crimping machine used can be crimped by using commonly used materials, and crimping methods such as constant tension method, constant torque method, belt-19- 200305043 type stretching method, constant internal stress program tension control method, etc. Curl. The polymer film used in the present invention is preferably subjected to a surface treatment in order to provide an optically anisotropic layer containing a liquid crystal compound described later. Specific methods include, for example, corona discharge treatment, glow discharge treatment, flame treatment, acid treatment, alkaline treatment, or ultraviolet irradiation treatment. According to the description in Japanese Patent Application Laid-Open No. 7- 3 3 3 4 3 3, an undercoat layer is preferably provided. From the viewpoint of maintaining the flatness of the film, the surface treatment temperature is preferably below the T g (glass transition temperature) of the polymer film, and more specifically, below 170 ° C. The surface energy of the polymer film used in the present invention is preferably more than 55 mN / m, more preferably 60 mN / m to 75 mN / m. The surface energy of solids can be measured by the contact angle method, the moist heat method, or the adsorption method described in "Basic Applications of Wetting" (Understanding Publishing Company, published on February 10, 1989). In the case of the polymer film of the present invention, the contact angle method is preferably used. Specifically, it is formed by dripping two kinds of solutions with known surface energy on the cellulose acetate film to form a drawing between the tangent of the droplet and the film surface according to the intersection of the surface of the droplet and the surface of the film. The angle including the droplet direction is defined as the contact angle, and the surface energy of the film is calculated. Although the optical compensation film of the present invention is an optically anisotropic layer formed of a liquid crystal compound on the prepared polymer film, the optical film provided on the polymer film subjected to surface treatment is optically disposed thereon. Between each -20- 200305043 anisotropic layer, it is more appropriate to install an alignment film. The alignment film system allows the liquid crystal compound used to be aligned in a certain direction. Therefore, in the production of the optical compensation film of the present invention, although an alignment film is necessary, if the liquid crystal compound is aligned and then it is fixed in an aligned state, it is not necessary to have an alignment film. In other words, the alignment film is not a necessary constituent element of the optical compensation film; in addition, only the optically anisotropic layer on the alignment film whose alignment state is fixed can be transferred onto the polymer film to manufacture the optical compensation film. The alignment film has a function of specifying an alignment direction of a liquid crystal compound. Alignment films can be formed by rubbing organic compounds (preferably polymers), orthorhombic treatment of inorganic compounds, forming microgroove-like layers, or by using the Lange's-Broadlot method (LB film). Set up by accumulating organic compounds (for example, omega-tricosanoic acid, dioctadecylmethylammonium chloride, and methyl stearate). In the present invention, the alignment film is preferably formed by rubbing the polymer. The alignment film is preferably a polyvinyl alcohol derivative. Particularly preferred is a modified polyvinyl alcohol having a hydrophobic group incorporated therein. Although the alignment film may be formed of one type of polymer ', it may be formed by rubbing a layer formed of two types of crosslinked polymers. At least one type of polymer is a self-crosslinkable polymer 'or a polymer crosslinked by crosslinking, and it is preferable to use any one of them. The alignment film system can introduce a polymer with a functional group or introduce a functional group into the polymer, and form a reaction between the polymers through changes in light, heat, ρ Η, etc .; 21- 200305043 The bond from the cross-linking agent is introduced into the polymers, and is produced by the cross-linking between polymers. The cross-linking reaction of the alignment film is carried out by applying an alignment film coating solution containing the polymer described above or a mixture containing the polymer and a cross-linking agent onto a polymer film, and then performing heating in accordance with desired heating. In order to ensure excellent durability at the final product stage, the cross-linking treatment may be performed at any stage after the alignment film is coated on the transparent support until the final optical compensation sheet is obtained. When considering the alignment of a compound (optical anisotropic layer) having a disc-like structure formed on an alignment film, the compound having a disc-like structure may be aligned, and then a crosslinking reaction may be sufficiently performed. The cross-linking reaction of an alignment film generally involves coating an alignment film coating solution on a polymer film and heating and drying it. It is preferable to set the heating temperature of such a coating liquid to a low point, and then, when the optically anisotropic layer is formed, the alignment film is sufficiently crosslinked during the heat treatment stage. The alignment film is preferably as described in Japanese Patent No. 2587398. The thickness of the alignment film is preferably from 0.1 to 10 μm. Heat drying can be performed at a heating temperature of 20 to 110 ° C. In order to sufficiently form the cross-linking, the temperature is preferably 60 to 100 ° C, and more preferably 80 to 100 ° C. The drying time may be from 1 minute to 36 hours, preferably from 5 minutes to 30 minutes. Also, P Η is preferably set to the optimum value in accordance with the crosslinking agent used. In the case of using glutaraldehyde as a crosslinking agent, the pH is preferably 4. 5 to 5. 5, especially good for 5. 200305043 The rubbing treatment can be performed using the treatment method widely used in the alignment treatment process of LCD liquid crystals. That is, the surface of the alignment film can be aligned by rubbing in a certain direction using paper, cloth, felt, rubber or nylon, polyester fiber, etc. Generally, it can also be implemented by rubbing several times with a cloth or the like made of fibers uniformly planted with fibers of uniform length and thickness. In the present invention, the optically anisotropic layer formed of a liquid crystalline compound is preferably formed on an alignment film provided on a polymer film. The liquid crystal compound used in the optically anisotropic layer includes rod-shaped liquid crystal compounds and disc-shaped liquid crystal compounds, which may be polymer liquid crystals or low-molecular liquid crystals. Furthermore, low-molecular liquid crystals Liquid crystals also include liquid crystal properties that do not exhibit cross-linking. Among them, a discotic liquid crystalline compound is ideal. In the optically anisotropic layer, a discotic liquid crystalline compound is preferably used. The discotic compound system includes a dish-like liquid crystal. The optically anisotropic layer contains a discotic liquid crystalline compound, a polymerization initiator described later, and optional additives (for example, a plasticizer, a monomer, a surfactant, a cellulose ester, 1, 3, 5 -A liquid crystal compound (coating solution) of a tri-acrylic compound, a coupler), which is coated on an alignment film, and is prepared by aligning a disc-driven liquid crystal compound. Examples of disc-shaped (dish-shaped) liquid crystalline compounds include C.  Research report by Destrade et al., In Mob Cryst. Benzene derivatives recorded in Volume 71, 111 (1981); c. Research report by Destrade et al. 200305043 in Mol.  Cryst. Triindene derivatives as described in Volume 122, page 141 (1985), Physics lett, A, Volume 78, page 82 (1990); B.  Research report by Kohn et al. In Angew.  Chem. Volume 96, page 70 (1 984) of the cyclohexane derivatives; and "· Lehn et al.  Chem.  Commun, p. 1794 (1985), with J.  Research report by Zhang et al., J.  Am.  Chem.  Soc. Nitrogen-crown or phenylacetylene-type macrocyclic compounds as described in vol. 116, p. 2655 (1994). In addition, the discotic liquid crystalline compound generally has a mother core that is a molecular center of this type, and has a linear alkyl group, an alkoxy group, and a substituted benzamidine group as its The chain has a structure in which it is replaced radially and exhibits liquid crystallinity. However, the molecule itself has negative uniaxiality, and the thing that imparts a predetermined alignment is not particularly limited to the thing described above. Moreover, in the present invention, when the optically anisotropic layer is formed from a dish-like compound, it is not always necessary to be the above-mentioned compound; for example, the aforementioned low-molecular-weight dish-like liquid crystal compound having a thermal or photoreactive group will eventually be caused by heat It reacts with light or the like to polymerize or crosslink the agent and form a high-molecular-weight substance that loses liquid crystallinity. In order to fix and fix the discotic liquid crystalline compound by polymerization, a polymerizable group needs to be combined as a substituent on the discoid center of the discotic liquid crystalline compound. However, it is preferable to introduce an elongated material (linking group) between the disc-shaped center and the polymerizable group. Preferred examples of the discotic liquid crystalline compound are those described in Japanese Patent Laid-Open No. 8-5002, and the polymerization of the discotic liquid crystalline compound is described in JP-24. -200305043 Bulletin 8-27284. In the present invention, the angle (tilt angle) between the disc surface of the discotic liquid crystalline compound and the surface of the polymer film is different depending on the depth direction of the optically anisotropic layer. That is, the angle of inclination changes as the distance from the bottom of the optically anisotropic layer increases; for example, such changes include continuous increase, continuous decrease, intermittent increase, intermittent decrease, and continuous Changes in increase and decrease, and intermittent changes including increase or decrease. Intermittent changes include areas where the inclination angle does not change in the layer thickness direction. The inclination angle includes areas where the inclination angle does not change, and it is preferable to increase or decrease all in the layer. The tilt angle is more preferably increased completely in the layer, and particularly preferably continuously changed. The inclination angle of the disc-shaped unit on the side of the alignment film can generally be adjusted by selecting the disc-shaped liquid crystal compound or the material of the alignment film, or by selecting the rubbing treatment method. In addition, the inclination angle of the disc-shaped unit on the surface side (air side) is generally adjusted by selecting a disc-shaped liquid crystal compound or another compound used together with the disc-shaped liquid crystal compound. . Examples of the compound that can be used together with the discotic liquid crystalline compound include, for example, plasticizers, surfactants, polymerizable monomers and polymers. Furthermore, the degree of change in the tilt angle can be adjusted by the above selection. The optically anisotropic layer may contain additives other than the discotic liquid crystalline compound. Plasticizers, surfactants, and polymerizable monomers that can be used simultaneously with the above-mentioned discotic liquid crystalline compounds, as long as they are compatible with the -25-200305043 dish-like compound and can give the dish-like compound a tilt change Corner, or as long as it does not interfere with the alignment, any such compound can be used. Among these, a polymerizable monopolymer (for example, a compound having a vinyl group, a vinyloxy group, an acrylfluorenyl group, or a methacrylfluorenyl group) is preferred. The amount of the compound to be added is generally 1 to 50% by weight, and more preferably 5 to 30% by weight based on the discotic liquid crystalline compound. In addition, when it is used in combination with a monopolymer having 4 or more reactive functional groups, the adhesion between the alignment film and the optically anisotropic layer can be improved. In the present invention, in general, the optically anisotropic layer is generally a solution formed by dissolving a discotic liquid crystalline compound and other compounds in a solvent, coated on the alignment layer, dried, and then heated. It is obtained by cooling to the formation temperature of the dish-shaped nematic phase, and then keeping it in the alignment state (dish-shaped nematic phase) and cooling it. Alternatively, the optically anisotropic layer is coated on the alignment layer by a solution formed by dissolving a discotic liquid crystalline compound and other compounds (for example, a polymerizable monomer or a photopolymerization initiator) in a solvent, It is made by drying, and then heating (for example, by UV light irradiation) to the formation temperature of the dish-like nematic phase, and then polymerizing it, and further cooling it. The discotic nematic phase-to-solid phase transition temperature of the discotic liquid crystalline compound used in the present invention is preferably 70 to 300 ° C, especially 70 to 170 ° C. In the present invention, it is preferred that the liquid crystal compound which is aligned is vicinal fixing. Immobilization is preferably carried out by polymerization. The polymerization reaction includes a thermal polymerization reaction using a thermal polymerization initiator and a photopolymerization reaction using a photopolymerization initiator -26- 200305043; however, a photopolymerization reaction is preferred. Examples of the photopolymerization initiator include α-carbonyl compounds (as described in the specifications of U.S. Patent No. 2376661 and U.S. Patent No. 2367670), ein ether (as described in the U.S. Patent No. 2 448 828), and α- Hydroxyl-substituted aromatic coupler compounds (as described in US Patent No. 272251 2), polynuclear quinone compounds (as described in US Patent No. 3046127 and US Patent No. 2951758), triarylimidazole dimers and P-amines A combination of acetophenone (as described in the specification of US Patent No. 3 5 4 9 3 6 7), a pyridine and a phenoxine compound (as described in each specification of Japanese Patent Application Laid-Open No. 60-105667 and US Patent No. 4239850), and噚 Diazo compounds (as described in US Patent No. 42 1 2970) and the like. The amount of photopolymerization initiator used is more preferably 0% of solids in the coating solution. 01 to 20 parts by mass, more preferably 0.5 to 5 parts by mass. The irradiation energy is preferably 20 mJ / cm², and more preferably 100 to 800 mJ / cm². In addition, in order to promote the photopolymerization reaction, light irradiation may be performed under heating conditions. As described above, by providing the optically anisotropic layer on the polymer film, the optical compensation film of the present invention can be manufactured. A protective layer may be provided above the optically anisotropic layer. The optical compensation film of the present invention can be used as a component of a polarizing plate and a component of an image display device. Especially when used in liquid crystal display devices, it will help to improve the viewing angle. Furthermore, in the case where the image display device is used under severe conditions (external force load, high temperature, high humidity), it will help reduce the degradation of the display quality due to light leakage -27- 200305043. Moreover, when used in polarizing plates and image display devices, it will help them to be thinner and lighter. In particular, the optical compensation film of the present invention is used alone or in the form of a polarizing plate bonded to a polarizing film for an image display device, particularly a transmissive liquid crystal display device. Hereinafter, embodiments of the optical compensation film of the present invention applied to a polarizing plate and an image display device will be described separately. [Polarizing plate] One of the embodiments of the polarizing plate of the present invention is a polarizing plate composed of a polarizing film and two transparent protective films disposed on both sides thereof; and a polarizing plate having at least one of the transparent protective films This is a polarizing plate of the optical compensation film of the present invention. It is also possible to use the optical compensation film of the present invention for only one of the protective films' and use the optical compensation film of the present invention for both protective films. In the case where one protective film is formed, a general cellulose acetate film can be used as the other protective film. As the polarizing film of the present invention, any of an iodine-based polarizing film, a dichroic dye-based polarizing film, and a polyolefin-based polarizing film can be used. The iodine-based polarizing film and the dye-based polarizing film are usually produced using a polyvinyl alcohol film. Furthermore, in terms of the durability of the polarizing plate, the durability (temperature and heat resistance) of the protective film is important. That is to say, due to the conditions of use of the image display device (under high obscenity), when water enters the polarizing film, the polarizing power is reduced. The polymer film which can be used as the optical compensation film of the present invention is preferably a polymer thin film formed by using a polymer having a moisture permeability within a predetermined range. The polymer film constituting the optical compensation film of the present invention is a polymerization obtained by hydrogenating a ring-opening polymer of tetracyclic eleven *, or a ring-opening polymer of tetracyclododecene and orthodox blue. When the structure is formed, the moisture permeability will be significantly reduced, so it becomes a better protective film for polarizing plates. [Image display device] One embodiment of the image display device of the present invention is a two polarizing plate, a liquid crystal cell holding the two polarizing plates, and at least one holding the polarizing plate and the liquid crystal. The image display device of the optical compensation film of the present invention is preferably a liquid crystal display device, and more preferably a transmissive liquid crystal display device. The aforementioned polarizing plate is a polarizing plate composed of a polarizing film and two transparent protective films arranged on both sides thereof. The optical compensation film of the present invention may be disposed between the liquid crystal cell and one polarizing plate, or may be disposed between the liquid crystal cell and two polarizing plates. The aforementioned liquid crystal cell system holds liquid crystal between two electrode substrates. The optical compensation film of the present invention can be used in combination with liquid crystal in various modes; for example, it can be used in combination with TN mode and OC mode. 4. Embodiments [Examples] The following examples are provided to further illustrate the present invention. The materials, reagents, ratios, operations, etc. shown in the following examples can be appropriately changed to a limited extent without departing from the spirit of the present invention. However, the scope of the present invention is not limited to the specific embodiments shown below. -29- 200305043 [Example 1] (Production of polymer film) A composition consisting of 100 parts by mass of "Renoir 1020R" (manufactured by Japan Reon) and 200 parts by mass of dichloromethane was charged. In the mixing tank, a polymer solution is prepared by stirring while heating. In a separate mixing tank, a composition consisting of 16 parts by mass of a hysteresis control agent represented by the following formula and 1,000 parts by mass of dichloromethane are charged, and the mixture is stirred while heating to prepare a hysteresis control. Solution. 474 parts by mass of this polymer solution was mixed with 63 parts by mass of the hysteresis control agent, and stirred sufficiently to prepare a coating solution. The addition amount of the hysteresis control agent is 5 with respect to 100 parts by mass of the polymer. 5 parts by mass. Hysteresis Booster

CHCH

NHNH

使用帶式流延機將所得到的塗布液予以流延，於1 5(TC 之條件下，對殘留溶劑量爲1 5質量。/。之薄膜進行拉伸倍率 爲1 2 0 %之縱向單軸拉伸，而製作成本發明之聚合物薄膜 (PF-01 )。 -30- 200305043 藉由使用橢圓計（Μ-1 50，日本分光（股）公司製）測定此種 聚合物薄膜（PF-01 )在550奈米波長下之遲滯値Re及遲滯値 R t h之値。將結果示於表1中。 更且，進一步以數位膜厚計（K-402B，安利茲（股）公司製 )，測定所製得之聚合物薄膜在面積爲1平方公尺（1公尺X 1 公尺）中之1 〇〇點的膜厚。其平均値爲62.0微米，標準偏差 爲1 . 5微米。 ·The obtained coating solution was cast using a belt casting machine, and the residual solvent amount was 15 mass under the condition of 15 ° C. The film was stretched in a longitudinal direction with a stretching ratio of 120%. The polymer film (PF-01) of the present invention was produced by axial stretching. -30- 200305043 This polymer film (PF-50) was measured by using an ellipse meter (M-1 50, manufactured by JASCO Corporation). 01) The hysteresis 値 Re and the hysteresis 値 R th at a wavelength of 550 nm. The results are shown in Table 1. Furthermore, the film thickness is further calculated in terms of digital thickness (K-402B, manufactured by Allitz Corporation) The thickness of the polymer film obtained was measured at a thickness of 1,000 points in an area of 1 square meter (1 meter X 1 meter). The average thickness was 62.0 micrometers, and the standard deviation was 1.5 micrometers. ·

(製做設有配向膜之聚合物薄膜） 其次，在對所製做的聚合物薄膜進行電暈處理之後，以 #16之瓦舍條塗機塗布（塗布量爲28毫升/平方公尺）由10質 量份之以下述構造式所代表的改性聚乙烯醇、37 1質量份之 水、1 1 9質量份之甲醇、及〇 . 5質量份之戊二醛（交聯劑）所 組成的塗布液，並以6 0 °C之熱風乾燥6 0秒，進一步以9 0 °C之熱風乾燥，而於本發明之聚合物薄膜上設置配向膜。 改性聚乙烯醇(Making a polymer film with an alignment film) Secondly, after the corona treatment is performed on the prepared polymer film, it is coated with a # 16 tiler bar coater (the coating amount is 28 ml / m 2) It is composed of 10 parts by mass of modified polyvinyl alcohol represented by the following structural formula, 37 parts by mass of water, 119 parts by mass of methanol, and 0.5 parts by mass of glutaraldehyde (crosslinking agent). The coating solution was dried with hot air at 60 ° C for 60 seconds, and further dried with hot air at 90 ° C, and an alignment film was provided on the polymer film of the present invention. Modified polyvinyl alcohol

-(CH2-CH)87.e--(CH2-CH)0.2 一一 (CH2-〒 Η)12·〇— OH Ο Ο—C〇-CH3-(CH2-CH) 87.e-(CH2-CH) 0.2-(CH2-〒 Η) 12 · 〇- OH Ο Ο-C〇-CH3

II

COCO

〇-(CH2U«〇-CH=CH2 (3fc學補償薄膜之製作） 在設有配向膜之聚合物薄膜的長軸方向與45°方向進行 摩擦處理，並#3之瓦舍條塗機塗布（塗布量爲5毫升/平方公 -31- 200305043 尺）由將4 1 . 0 1克之以下沭 「述構m式所代表的碟狀液晶性化合 物、4.06克之環氧乙烷變性三羥甲基丙烷三丙烯酸酯（v#36〇 ，大阪有機化學（股）公司製）、0.23克之纖維素乙酸酯丁酸 酯（CAB551-0.2，伊斯托曼化學公司製）、〇.9〇克之纖維素 乙酸酯丁酸酯（C A B 5 3 1 · 1，伊斯托曼化學公司製）、1 . 3 5克 之光聚合起始劑（伊魯鎵克阿-9 0 7，日本化葯（股）公司製）、 及0 _ 4 5克之增感劑（伊魯鎵克阿-d E T X，日本化葯（股）公司 製）溶解於1 2 0克之甲乙酮中所形成的塗布液。 將此所得之物予以貼附在金屬框架上，於1 3 0 °C之恒溫 槽中加熱2分鐘，以將該碟狀液晶性化合物予以配向。接著 ，於1 3 0 °C下，使用1 2 0瓦/公分之高壓水銀燈照射U V 1分 鐘，以將碟狀液晶性化合物予以聚合。放置並冷卻至室溫而 製做成光學補償薄膜（KH-01)。 碟狀液晶性化合物〇- (CH2U «〇-CH = CH2 (manufacturing of 3fc science compensation film) Rubbing treatment is performed on the long axis direction and 45 ° direction of the polymer film provided with the alignment film, and the coating is applied by the # 3 tiler coater The coating amount is 5 ml / cm 2 -31- 200305043 ft). A dish-like liquid crystalline compound represented by the following formula "4.11 g" and 4.06 g of ethylene oxide-denatured trimethylolpropane Triacrylate (v # 36〇, manufactured by Osaka Organic Chemical Co., Ltd.), 0.23 g of cellulose acetate butyrate (CAB551-0.2, manufactured by Eastman Chemical Co., Ltd.), 0.90 g of cellulose Acetate butyrate (CAB 5 3 1 · 1, manufactured by Eastman Chemical Co., Ltd.), 1.55 g of photopolymerization initiator (Ilugalak-9-9, Nippon Kayaku Co., Ltd.) Co., Ltd.), and a coating solution formed by dissolving 0 to 45 grams of sensitizer (Ilugalak-d ETX, manufactured by Nippon Kayaku Co., Ltd.) in 120 grams of methyl ethyl ketone. The object was attached to a metal frame, and heated in a thermostatic bath at 130 ° C for 2 minutes to align the dish-like liquid crystal compound. At 130 ° C, use a high-pressure mercury lamp of 120 watts / cm to irradiate UV for 1 minute to polymerize the dish-like liquid crystal compound. Place and cool to room temperature to make an optical compensation film (KH-01 ). Dish liquid crystal compound

【實施例2】 (聚合物薄膜之製作） 將由150質量份之「芮諾阿1020R」（日本芮翁製）、及 -32- 200305043 3 5 0質量份之二氯甲烷所構成的組成物投入混合槽中’邊加 熱邊攪拌而調製成聚合物溶液。將4 7 4質量份之此種聚合物 溶液對6 3質量份之與實施例1同樣的遲滯値控制劑予以混 合，並充分地攪拌而調製成塗布液。相對於1 0 0質量份之聚 合物計，遲滯値控制劑之添加量係爲3 _ 5質量份。 使用帶式流延機將所得到的塗布液予以流延’使在帶上 之膜面溫度變爲40°C，再以70 °C之熱風乾燥1分鐘，並從 帶上剝離並取出薄膜。接著，以1 40 °C之熱風將此薄膜乾燥 1 〇分鐘，而製做成殘留溶劑量爲彳5質量％之聚合物薄膜 (PF-02，厚度爲50微米）。 以和實施例1同樣的做法，對所製做的聚合物薄膜（PF-0 2)進行光學特性之測定。將結果示於表1中。 (製做設有配向膜之聚合物薄膜） 在對所製做的聚合物薄膜進行電暈處理之後，以和實施 例1完全同樣的做法，而製做出設有配向膜之聚合物薄膜。 (光學補償薄膜之製作） 在設有配向膜之聚合物薄膜的長軸方向與平行方向進行 摩擦處理，並#3.6之瓦舍條塗機塗布（塗布量爲6.3毫升/平 方公尺）由將4 1 _ 0 1克之在實施例1中所使用的碟狀液晶性 化合物、4.06克之環氧乙烷變性三羥甲基丙烷三丙烯酸酯 (V#360，大阪有機化學（股）公司製）、1 _35克之光聚合起始 劑（伊魯鎵克阿-907，日本化葯（股）公司製）、及0·45克之增 感劑（伊魯鎵克阿_DETX，日本化葯（股）公司製）溶解於1〇2 -33- 200305043 克之甲乙酮中所形成的塗布液。 於1 30 °C之恒溫槽中對此加熱2分鐘，以將該碟狀液晶 性化合物予以配向。接著，於6 0 °C之周圍環境下，使用1 2 0 瓦/公分之高壓水銀燈照射UV1分鐘，以將碟狀液晶性化合 物予以聚合；放置並冷卻至室溫使形成光學各向異性層而製 做成光學補償薄膜（KH-02)。 【實施例3】 (聚合物薄膜之製作） 將由100質量份之「芮諾阿1020R」（日本芮翁製）、及 300質量份之二氯甲烷、以及30質量份之氮化硼粉末所構 成的組成物投入混合槽中，邊加熱邊攪拌使各種成分溶解， 而調製成聚合物溶液。將474質量份之此種聚合物溶液對 3 6質量份之與實施例1同樣的遲滯値控制劑予以混合，並 充分地攪拌而調製成塗布液。相對於1 0 0質量份之聚合物計 ，遲滯値控制劑之添加量係爲3.5質量份。 使用該所得到的塗布液，以和實施例2完全同樣的做法 ，進而製做成（厚度爲50微米）本發明之聚合物薄膜（pf-0 3) 〇 對所得到的聚合物薄膜（PF-03)進行熱傳導率之測定，其 値爲1 .2 W / (m · K)。以和實施例1同樣的做法，進行光學 特性之測定。將結果示於表1中。 (製做設有配向膜之聚合物薄膜） 在對所製做的聚合物薄膜進行電暈處理之後，以和實施 -34- 200305043 例1完全同樣的做法，而製做出設有配向膜之聚合物薄膜。 (光學補償薄膜之製作） 除了使用聚合物薄膜（PF-03)之外，均進行和實施例2 完全同樣的做法，而製做成本發明之光學補償薄膜（Κ Η-03) 【比較例】 (聚合物薄膜之製作） 將由1 00質量份之聚碳酸酯樹脂（純艾斯：帝人化成製） 、及350質量份之二氯甲烷所構成的組成物投入混合槽中 ，邊加熱邊攪拌而調製成聚合物溶液（塗布液）。 使用帶式流延機將所得到的塗布液予以流延，使在帶上 之膜面溫度變爲40 °C，再以40 °C之熱風乾燥1分鐘，並從 帶上剝離並取出薄膜。接著，在1 50 °C之條件下，藉由拉幅 機予以拉伸，堂垂直於搬運方向的方向拉伸25%之後，並膜 乾燥1 〇分鐘，進一步在殘留溶劑量爲7.0質量％之狀態沿著 搬運方向拉伸25%，而製做成比較例之聚合物薄膜（PFH-01 ，厚度爲80微米）。對所製做的聚合物薄膜（PFH-01 )進行光 學特性之測定。將結果不於表1中。 (製做設有配向膜之聚合物薄膜） 在對所製做的聚合物薄膜進行電暈處理之後，以和實施 例1完全同樣的做法，而製做出設有配向膜之聚合物薄膜。 (光學補償薄膜之製作） 除了使用比較例1之聚合物薄膜（PF Η-01 )之外’均進行 -35- 200305043 和實施例1完全同樣的做法，而製做成比較例之光學補償薄 膜（KHH-1卜 表1 聚合物 ------一— 聚合物薄膜 種 光彈性係數 透溼度 種 Re Rth 類 (X10_12平方公 (克/平方公 類 (奈米） (奈米） 尺/牛頓） 尺•小時） 實施例1 環狀聚 烯烴M 6.3 0.23 〜0_29 PF-01 40 185 實施例2 環狀聚 烯烴M 6.3 0.23 〜0.29 PF-02 4 78 實施例3 環狀聚 烯烴M 6.3 0.23 〜0.29 PF-03 5 79 比較例1 聚碳酸 酯*2 72 〜90 13 PFH- 1 15 200 芮諾阿1 020R」（日本芮翁製） + 2 :純艾斯（帝人化成製） 【實施例4】 製做一將碘吸附在經拉伸的聚乙烯醇薄膜上的偏光膜， 對在實施例1中所製做的光學補償薄膜（KH-01)之聚合物薄 膜側進行電暈處理，再貼附於塗布有聚乙烯醇系黏著劑之偏 -36- 200305043[Example 2] (Production of polymer film) A composition composed of 150 parts by mass of "Renoir 1020R" (manufactured by Japan Reon) and -32- 200305043 3 50 parts by mass of methylene chloride was put into In the mixing tank, a polymer solution is prepared by stirring while heating. 4 7 4 parts by mass of this polymer solution was mixed with 6 3 parts by mass of the same hysteresis control agent as in Example 1, and stirred sufficiently to prepare a coating solution. The amount of the hysteresis control agent is 3 to 5 parts by mass based on 100 parts by mass of the polymer. The obtained coating solution was cast 'using a belt casting machine so that the film surface temperature on the belt became 40 ° C, and it was dried with hot air at 70 ° C for 1 minute, and the film was peeled from the belt and taken out. Then, the film was dried with hot air at 1 40 ° C for 10 minutes to prepare a polymer film (PF-02, 50 μm thick) with a residual solvent content of 彳 5% by mass. In the same manner as in Example 1, the optical properties of the prepared polymer film (PF-0 2) were measured. The results are shown in Table 1. (Production of a polymer film provided with an alignment film) After the corona treatment was performed on the produced polymer film, a polymer film provided with an alignment film was produced in exactly the same manner as in Example 1. (Fabrication of optical compensation film) Rubbing treatment is performed on the long axis direction and parallel direction of the polymer film provided with the alignment film, and the coating is applied by a # 3.6 Wasser bar coater (the coating amount is 6.3 ml / m2). 4 1 _ 0 1 g of the dish-like liquid crystalline compound used in Example 1, 4.06 g of ethylene oxide modified trimethylolpropane triacrylate (V # 360, manufactured by Osaka Organic Chemicals Co., Ltd.), 1 _35 g of photopolymerization initiator (Ilugalak-907, manufactured by Nippon Kayaku Co., Ltd.) and 0.45 g of sensitizer (Ilugalak_DETX, Nippon Kayaku (Co.)) Co., Ltd.) A coating solution formed by dissolving in methyl ethyl ketone of 10-33-200305043 g. This was heated in a thermostatic bath at 130 ° C for 2 minutes to align the dish-like liquid crystalline compound. Next, in a surrounding environment of 60 ° C, use a high-pressure mercury lamp of 120 watts / cm to irradiate UV for 1 minute to polymerize the discotic liquid crystalline compound; place and cool to room temperature to form an optically anisotropic layer. Made of optical compensation film (KH-02). [Example 3] (Production of polymer film) It will be composed of 100 parts by mass of "Renoir 1020R" (manufactured by Rihon Japan), 300 parts by mass of dichloromethane, and 30 parts by mass of boron nitride powder. The composition was put into a mixing tank and stirred while heating to dissolve various components to prepare a polymer solution. 474 parts by mass of this polymer solution was mixed with 36 parts by mass of the same hysteresis control agent as in Example 1, and thoroughly stirred to prepare a coating solution. The amount of the hysteresis control agent is 3.5 parts by mass based on 100 parts by mass of the polymer. Using the obtained coating solution, a polymer film (pf-0 3) of the present invention (pf-0 3) was prepared (with a thickness of 50 μm) in exactly the same manner as in Example 2. The obtained polymer film (PF -03) The thermal conductivity was measured, and 値 was 1.2 W / (m · K). The optical characteristics were measured in the same manner as in Example 1. The results are shown in Table 1. (Making a polymer film with an alignment film) After corona treatment is performed on the produced polymer film, a polymer film with an alignment film is produced in exactly the same manner as in Example 1 of -34- 200305043. Polymer film. (Production of Optical Compensation Film) Except that the polymer film (PF-03) was used, the same procedure as in Example 2 was performed, and the optical compensation film (Κ Η-03) of the present invention was produced. [Comparative Example] (Production of polymer film) A composition composed of 100 parts by mass of a polycarbonate resin (pure Ace: manufactured by Teijin Chemical Co., Ltd.) and 350 parts by mass of dichloromethane was put into a mixing tank and stirred while heating A polymer solution (coating liquid) was prepared. The obtained coating solution was cast using a belt caster so that the film surface temperature on the belt became 40 ° C, and then dried with hot air at 40 ° C for 1 minute, and the film was peeled from the belt and taken out. Next, at a temperature of 1 50 ° C, the film was stretched by a tenter, and after being stretched by 25% in a direction perpendicular to the conveying direction, the film was dried for 10 minutes, and the residual solvent amount was 7.0% by mass. The state was stretched by 25% along the conveyance direction, and a polymer film (PFH-01, 80 μm thick) of Comparative Example was prepared. Optical properties of the prepared polymer film (PFH-01) were measured. The results are not shown in Table 1. (Production of a polymer film provided with an alignment film) After the corona treatment was performed on the produced polymer film, a polymer film provided with an alignment film was produced in exactly the same manner as in Example 1. (Production of Optical Compensation Film) Except that the polymer film (PF 1-01) of Comparative Example 1 was used, the same procedure was performed as in -35- 200305043 and Example 1, and an optical compensation film of Comparative Example was prepared. (KHH-1 Table 1 polymer ------ one-polymer film type photoelastic coefficient moisture permeability type Re Rth type (X10_12 square meter (g / square meter (nano)) (nano) feet / Newton) feet • hours) Example 1 Cyclic polyolefin M 6.3 0.23 to 0_29 PF-01 40 185 Example 2 Cyclic polyolefin M 6.3 0.23 to 0.29 PF-02 4 78 Example 3 Cyclic polyolefin M 6.3 0.23 ~ 0.29 PF-03 5 79 Comparative Example 1 Polycarbonate * 2 72 ~ 90 13 PFH- 1 15 200 Renoir 1 020R "(made by Japan's Rihon) + 2: Pure Ace (made by Teijin Kasei) [Example 4] A polarizing film was prepared by adsorbing iodine on the stretched polyvinyl alcohol film, and the polymer film side of the optical compensation film (KH-01) prepared in Example 1 was corona treated. Re-attached to the coated with polyvinyl alcohol-based adhesive -36- 200305043

光膜的單側上。又，對市售的纖維素乙酸酯薄膜（TD_8〇UF ，富士照相軟片（股）公製司）進行鹼化處理，使用聚乙稀醇系 黏著劑貼附在偏光膜之相反側上，而製做成本發明之偏光板 (PP-01 卜 除了使用（K Η - 0 2 )、（ K Η - 0 3 )、（ Κ Η Η -1 )做爲聚合物薄膜 以外，均進行完全同樣的做法而製做成本發明之偏光板 (ΡΡ-02)、（ΡΡ-03)、以及比較例之之偏光板（pph-彳）。 【實施例5】 將設置於使用ΤΝ型液晶晶胞的液晶顯示裝置（AQU〇s LC-20C1-S，夏普（股）公司製）上的一對偏光板，而代之以實 施例4中所製做的偏光板（P P - 〇 2 )、及（P P - 〇 3 )，經由黏著劑 使光學補償薄膜側成爲液晶晶胞側，繼續在觀察者側及背光 側貼附一枚而製做成本發明之T N型液晶顯示裝置（L c D - 0 2 ) 及（L C D - 0 3 )。使觀察者側之偏光板的穿透軸和背光側之偏光 板的穿透軸成正交，而且將液晶晶胞的摩擦方向與光學各向 異性層之摩擦方向配置成逆向平行的狀態。 使用測定裝置（EZ-對比1 60D，ELDIM公司製），對所製 做的液晶顯示裝置測定從顯示黑色（L1 )至顯示白色（L8 )等8個 級數之視角。將結果示於表2中。表2中之數字，以對比爲1 〇 以上來表示在黑側上無色調反轉（L1和L2間之反轉）之範圍。 -37- 200305043 表2 顯示裝置 上 下 左右 LCD-02 55° 52° 1 1 8° LCD-03 53° 56° 1 20° (圖形邊緣之穿透率上昇之評量） 在溫度爲25°C、相對溼度爲60%之條件下，以配置於所 製做的L C D - 0 2及0 3之背光連續點燈5小時之後，在全面 黑色顯示狀態的暗室中以目視觀察並評量光漏。結果，並沒 有產生圖形邊緣之穿透率上昇（光漏）。 【實施例6】 在附有ITO電極之玻璃基板上設置聚醯胺膜敞做配向膜 ，並進行摩擦處理。使所得到的二枚玻璃與摩擦方向成平行 的方向一致，晶胞間距設定爲6微米，並注入△ η爲0.1396 之液晶性化合物（ZL1 1 132，美錄庫公司製）而製做成彎曲配 向液晶晶胞。以挾持此種彎曲配向晶胞狀，將在實施例4中 所製做的橢圓偏光板之偏光板（ΡΡ-01 )、及（ΡΡΗ-01 )予以貼 合在光學各向異性層之液晶晶胞側，而且使，液晶晶胞的摩 擦方向與光學各向異性層之摩擦方向配置成逆向平行的狀 態，而分別製做成〇 C Β模式之液晶晶胞L C D - 0 1及0 4。以 5 5 Η ζ對此種液晶顯示裝置施加白色顯示2 V、黑色顯示5 V 之矩形波電壓，使用測定裝置（Ε Ζ -對比1 6 0 D，E L D I Μ公司 製），測定從顯示黑色（L1 )至顯示白色（L8)等8個級數之視 角。將結果示於表3中。表3中之數字，以對比爲1 〇以上 -38- 200305043 來表示在黑側上無色調反轉（L 1和L2間之反轉）之範圍。 表3 顯示裝置 上 下 左右 LCD-01 78° 76° 1 60° LCD-04 80° 78° 160° (圖形邊緣之穿透率上昇之評量） 在溫度爲2 5 °C、相對溼度爲6 0 %之條件下’以配置於所 製做的LCD-01及04之背光連續點燈5小時之後，在全面 黑色顯示狀態的暗室中以目視觀察並評量光漏。結果LCD-〇 1沒有產生圖形邊緣之穿透率上昇（光漏），然而L c D -0 4則 在圖面上發生圖形邊緣（特別是上、下方）之光漏，因而畫質 變爲貧弱。 【發明效果】 設若依照本發明的話，將可以提供一種有助於改善在使 用於影像顯示裝置之情況下的視角’同時即使該前述之影像 顯示裝置係於嚴酷的條件下使用時’亦有助於減輕因光漏而 引起之顯示品質下降之光學補償薄膜、以及偏光板。又且’ 依照本發明的話，將可以提供一種在嚴酷條件下使用時所生 成的光學特性變化變少’而且耐久性優良的光學補償薄膜及 偏光板。此外’依照本發明的胃舌’將可以提供一種廣視角’ 而且可以減輕因爲在嚴酷的條件下使用時所產生的光漏而 引起之顯示品質下降’以及耐久性優良的影像顯示裝置。 -39-Light film on one side. In addition, a commercially available cellulose acetate film (TD_80UF, Fuji Photographic Film Co., Ltd.) was subjected to alkalizing treatment, and a polyvinyl alcohol-based adhesive was used to adhere to the opposite side of the polarizing film. The polarizing plate of the invention (PP-01, except that (K Η-0 2), (K Η-0 3), and (Κ Κ Η -1) is used as the polymer film is all the same.) The polarizing plates (PP-02) and (PP-03) of the present invention and the polarizing plates (pph- 彳) of the comparative example were fabricated in the same manner. [Example 5] A liquid crystal set on a TN-type liquid crystal cell A pair of polarizing plates on the display device (AQU0s LC-20C1-S, manufactured by Sharp Corporation), and replaced with the polarizing plates (PP-〇2) and (PP -〇3), the optical compensation film side becomes the liquid crystal cell side through the adhesive, and one piece is attached to the observer side and the backlight side to make the TN type liquid crystal display device of the invention (L c D-0 2) And (LCD-0 3). Make the penetrating axis of the polarizer on the viewer side and the penetrating axis of the polarizer on the backlight side orthogonal. The rubbing direction of the unit cell and the rubbing direction of the optically anisotropic layer are arranged in an antiparallel state. Using a measuring device (EZ-Comparative 1 60D, manufactured by ELDIM), the manufactured liquid crystal display device was measured from display black (L1 ) To display 8 levels of viewing angles such as white (L8). The results are shown in Table 2. The numbers in Table 2 indicate that there is no tone inversion on the black side with a contrast of 10 or more (between L1 and L2) (Reversed). -37- 200305043 Table 2 Display Device Up, Down, Left and Right LCD-02 55 ° 52 ° 1 1 8 ° LCD-03 53 ° 56 ° 1 20 ° Under the conditions of 25 ° C and 60% relative humidity, the backlights arranged on the LCDs-0 2 and 0 3 were continuously turned on for 5 hours, and then visually observed in a dark room with a full black display state. And the light leakage was evaluated. As a result, the transmittance of the edge of the pattern did not increase (light leakage). [Example 6] A polyimide film was set on the glass substrate with an ITO electrode as an alignment film and rubbed. Treatment: Make the two glasses obtained parallel to the rubbing direction Consistently, the cell spacing is set to 6 micrometers, and a liquid crystal compound (ZL1 1 132, manufactured by Melco) is injected with Δ η of 0.1396 to make a curved alignment liquid crystal cell. The curved alignment cell is held in such a shape The polarizing plates (PP-01) and (PP-01) of the elliptical polarizing plate prepared in Example 4 were bonded to the liquid crystal cell side of the optically anisotropic layer, and the liquid crystal cell The rubbing direction and the rubbing direction of the optically anisotropic layer are arranged in an antiparallel state, and the liquid crystal cell LCDs-0 1 and 0 4 in the OC mode are manufactured separately. A rectangular wave voltage of 2 V for white display and 5 V for black display was applied to this liquid crystal display device at 5 5 Η ζ, and the measurement was performed from the display black (using EZ-comparison 16 0 D, manufactured by ELDI M). L1) to 8 levels of viewing angles such as white (L8). The results are shown in Table 3. The numbers in Table 3 indicate the range where there is no tone inversion (inversion between L 1 and L2) on the black side with a contrast of 10 or more -38- 200305043. Table 3 Display device up, down, left and right LCD-01 78 ° 76 ° 1 60 ° LCD-04 80 ° 78 ° 160 ° (evaluation of the increase in the transmittance of the edge of the graphic) at a temperature of 2 5 ° C and a relative humidity of 6 0 Under the conditions of% ', the backlights arranged on the produced LCD-01 and 04 are continuously turned on for 5 hours, and then the light leakage is visually observed and evaluated in a dark room with a full black display state. As a result, LCD-〇1 did not increase the transmittance (light leakage) of the edge of the pattern, but L c D -0 4 caused light leakage of the edge of the pattern (especially the top and bottom) on the surface, so the image quality became poor and weak. [Effects of the Invention] Provided that according to the present invention, it is possible to provide an angle of view that is helpful in improving the viewing angle when used in an image display device, and that it is helpful even when the aforementioned image display device is used under severe conditions. Optical compensation film and polarizing plate for reducing display quality degradation caused by light leakage. Furthermore, according to the present invention, it is possible to provide an optical compensation film and a polarizing plate which have less change in optical characteristics generated when used under severe conditions and have excellent durability. In addition, the "stomach tongue according to the present invention" can provide a wide viewing angle ", and can reduce the deterioration of display quality caused by light leakage generated when used under severe conditions" and an image display device with excellent durability. -39-

Claims (1)

200305043 拾、申請專利範圍 1、一種光學補償薄膜，其係在一聚合物薄膜上方具有一包 括液晶性化合物的光學各向異性層，其特徵在於：該聚 合物薄膜係由具有光彈性係數爲10X10-12平方公尺/牛 頓以下，以及依照Jis Z0208試驗法所測定之透溼度爲1 克/平方公尺· 24小時以下之聚合物所構成，並且根據下 式（I )所定義之Re遲滯値係在0〜100奈米之範圍，而且 根據下式（Π )所定義的Rth遲滯値係在70〜500奈米之範 圍； (I ) Re = (nx-ny) x d (Π ) Rth = {(nx + ny)/2-nz} x d (式中，nx及ny分別代表在聚合物薄膜平面內之遲相軸方 向及進相軸方向的折射率；而nz則代表在聚合物薄膜之厚 度方向的折射率；以及d代表聚合物薄膜之厚度）。 2 . —種偏光板，其特徵在於：該偏光板係由偏光膜、及配 置在其兩側上的二枚透明保護膜所構成；其中至少一枚 之透明保護膜係爲如申請專利範圍第1項所載之光學補 償薄膜。 3 . —種影像顯示裝置，其係具有二枚偏光板、挾持前述二 枚偏光板之液晶晶胞、以及至少一枚之挾持前述偏光板 和前述液晶晶胞的如申請專利範圍第1項所載之光學補 償薄膜。 -40- 200305043 陸、（一)、本案指定代表圖爲:第_圖 (二）、本代表圖之元件代表符號簡單說明： 柒、本案若看化學式時，請掲示蕞能顯示發明特徵的化學 . ' : ' .. :: ： ： :200305043 Patent application scope 1. An optical compensation film, which has an optically anisotropic layer including a liquid crystal compound on a polymer film, and is characterized in that the polymer film has a photoelastic coefficient of 10X10 -12 m ^ 2 / Newton or less, and a polymer having a moisture permeability of 1 g / m ^ 2 under 24 hours measured according to the Jis Z0208 test method, and a Re hysteresis defined by the following formula (I) Is in the range of 0 to 100 nanometers, and Rth hysteresis is defined in the range of 70 to 500 nanometers according to the following formula (Π); (I) Re = (nx-ny) xd (Π) Rth = { (nx + ny) / 2-nz} xd (where nx and ny represent the refractive index in the direction of the retardation axis and the phase advancement axis in the plane of the polymer film, respectively; and nz represents the thickness of the polymer film Refractive index in the direction; and d represents the thickness of the polymer film). 2. A polarizing plate, characterized in that the polarizing plate is composed of a polarizing film and two transparent protective films arranged on both sides thereof; at least one of the transparent protective films is as described in the patent application Optical compensation film contained in item 1. 3. An image display device comprising two polarizing plates, a liquid crystal cell holding the two polarizing plates, and at least one holding the polarizing plate and the liquid crystal cell as described in item 1 of the scope of patent application. Contained optical compensation film. -40- 200305043 Lu, (a), the designated representative of this case is: Figure _ (b), the representative symbols of this representative diagram are briefly explained: 柒, if you look at the chemical formula in this case, please show the chemistry that can show the characteristics of the invention . ':' .. ::::::
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