1279596 九、發明說明： 【發明所屬之技術領域】 本發明是關於一種可提供光學補償之薄形化偏光板 及其製法，尤指一種適用於内平面轉換式液晶顯示裝置 (IPS LCD)中，且藉由在偏光板上直接内建兩片光學補 償膜，以達到對IPS LCD在傾斜角度上之對比及色偏問 喊加以改善的一種偏光板者。 【先前技術】 液晶顯示裝置（Liquid Crystal Display ;簡稱 LCD ) 已廣泛使用於各式電子資訊裝置上，例如電視、電腦、手 機、個人數位助理（PDA)等等。而其中TFT_LCD由於 具備快速應答特性與正視角高對比特性，近年來更儼然已 成為液晶顯示裝置的主流技術。 請參閱圖一 A，為一典型的傳統液晶顯示裝置1〇的 剖面示意圖。該傳統液晶顯示裝置10 一般均包括：一液 晶元件 11 (Liquid Crystal Cell)、及兩偏光板 12、13 (Polarizer)分別置於液晶元件Π之上下兩侧表面。該液 晶元件11係由一玻璃基板及附著於玻璃基板兩表面 之多數液晶分子等元件所構成。偏光板12 (或π)則係 以兩透明基板121、122 (或131、132)夾覆一偏光薄膜 123 (或133)所構成，可提供偏光功能。 對於採用内平面轉換式（In-Plane Switching ;簡稱 IPS)技術之液晶顯示裝置1〇 (Lcd)而言，其雖宣稱不 1279596 須光學補償膜（Optical Compensatory Sheet)即可於傾斜 角度方向上具有廣視角的功能，亦即，在45度與135度 方向上可提供相對較高的對比值（Contrast)。然而，實際 上在以傾斜角度觀察時，仍可發現使用傳統IPS技術之液 晶顯示裝置10在晝面全黑的狀態下，於傾斜角度的方向 仍會顯現出偏黃或是偏紅而非全黑的色彩、且對比度也未 能達到理想狀態。例如’請參閱圖一 B，為傳統IPS技術 之液晶顯示裝置10在晝面全黑的狀態下，其色彩分佈狀 蟪之曲線圖。由圖一 B可發現在45度與135度之傾斜角 度方向上，其色彩分佈有嚴重色偏現象。由此可顯示出使 用傳統IPS技術之液晶顯示裝置10在傾斜角度方向上的 色偏情況（尤其是紅色色偏）仍很嚴重，再加上不甚理想 的對比表現，如此將導致顯示品質的降低。 後有人研發出在液晶顯示裝置10上增設一光學補償 板14，以提高在傾斜角度上的可視效果及改善色偏情 況。請參閱圖二，為習知於液晶顯示裝置1〇上增設光學 補償板14的剖面示意圖。其主要是在液晶元件^與其上 方之偏光板12之間，額外貼覆一光學補償板14。該光學 補償板14主要係由包括··一透明基板141、及一或多層 冬光線阻滯薄膜142、143 (PhaseRetarder)。該光線阻滯 薄膜142、143可對特定波長之光產生預定角度與方向之 阻滞，進而改善液晶顯示裝置1G於傾斜角度上的顯示品 質。而液晶元件11上、下兩側之兩偏光板12、13同樣是 以兩透明基板⑵、122、13卜132夾置—偏光薄膜123、 7 12795961279596 IX. Description of the Invention: [Technical Field] The present invention relates to a thinned polarizing plate capable of providing optical compensation, and a method of manufacturing the same, and more particularly to an inner planar conversion type liquid crystal display device (IPS LCD). And by directly constructing two optical compensation films on the polarizing plate, a polarizer for improving the contrast of the IPS LCD in the tilt angle and the color shifting call is improved. [Prior Art] A liquid crystal display (LCD) has been widely used in various electronic information devices such as televisions, computers, mobile phones, personal digital assistants (PDAs), and the like. Among them, TFT_LCD has become the mainstream technology of liquid crystal display devices in recent years due to its fast response characteristics and high contrast characteristics. Please refer to FIG. 1A, which is a schematic cross-sectional view of a typical conventional liquid crystal display device. The conventional liquid crystal display device 10 generally includes a liquid crystal cell (11) and two polarizing plates 12 and 13 (Polarizer) respectively disposed on the upper and lower surfaces of the liquid crystal cell. The liquid crystal element 11 is composed of a glass substrate and a plurality of liquid crystal molecules attached to both surfaces of the glass substrate. The polarizing plate 12 (or π) is formed by sandwiching a polarizing film 123 (or 133) with two transparent substrates 121, 122 (or 131, 132) to provide a polarizing function. For the liquid crystal display device 1 (Lcd) using the In-Plane Switching (IPS) technology, it claims that it does not have an optical compensatory sheet of 1279596 and can have an oblique angle direction. The wide viewing angle function, that is, provides a relatively high contrast value (Contrast) in the 45 degree and 135 degree directions. However, in fact, when viewed at an oblique angle, it can be found that the liquid crystal display device 10 using the conventional IPS technology still appears yellowish or reddish instead of full in the direction of the tilt angle in the state where the face is completely black. Black color and contrast have not been ideal. For example, please refer to Fig. 1B, which is a graph showing the color distribution of the liquid crystal display device 10 of the conventional IPS technology in a state where the back surface is completely black. It can be seen from Fig. 1B that the color distribution has a serious color shift in the direction of the oblique angle of 45 degrees and 135 degrees. Therefore, it can be shown that the color shift of the liquid crystal display device 10 using the conventional IPS technology in the oblique angle direction (especially the red color shift) is still serious, and the contrast performance is not ideal, which will result in display quality. reduce. Later, it has been developed to add an optical compensation plate 14 to the liquid crystal display device 10 to improve the visual effect at the tilt angle and to improve the color shift. Referring to FIG. 2, a cross-sectional view of an optical compensation plate 14 is conventionally added to the liquid crystal display device 1A. It is mainly disposed between the liquid crystal element ^ and the polarizing plate 12 above it, and an optical compensation plate 14 is additionally attached. The optical compensation plate 14 is mainly composed of a transparent substrate 141 and one or more layers of winter light blocking films 142 and 143 (Phase Retarder). The light blocking films 142, 143 can generate a predetermined angle and direction retardation for light of a specific wavelength, thereby improving the display quality of the liquid crystal display device 1G at an oblique angle. The two polarizing plates 12 and 13 on the upper and lower sides of the liquid crystal element 11 are also sandwiched by two transparent substrates (2), 122, and 13--polarized film 123, 7 1279596
133所構成。例如，中華民國專利公告號第號、 562955號、528882號、558643號、及美國專利號us 6717642等習知前案’均揭露有在液晶顯示裝置上增設光 學補彳員板以增加視角範圍與顯示品質的技術。 刚述之各習知前案，均如同圖二所示之習知液晶顯示 恭10般，其係將偏光板12、13與光學補償板14分別單 獨生產後、再以黏膠貼合在一起。由於偏光板12、13和 光學補彳員板14需分別生產，所以其分別均需要有至少一 透明基板122、132、141來提供足夠的結構強度與硬度， 且偏光板12、13更需要上下兩片透明基板12卜122、13卜 132以達到保護偏光薄膜123、133與防刮的效果。然而， 所使用的透明基板片數愈多、以黏膠貼合的層數愈多，則 不僅液晶顯示裝置10整體厚度愈加提高、且透光率與光 學特性亦將愈差，而仍有進一步改良之空間者。 【發明内容】 本發明的主要目的是提供一種可提供光學補償之薄 形化偏光板及其製法，藉由在偏光板上直接内建兩片光學 補償膜（Optical Compensatory Sheet)，來取代偏光板原有 之其中一片透明基板，不僅可使得偏光板可相對更薄，且 更可達到對液晶顯示裝置在傾斜角度上之對比及色偏問 題加以改善者。 本發明的主要目的是提供一種具有可提供光學補 償之薄形化偏光板的液晶顯示裝置。 8 1279596 為達前述目的’本發明之具有可提供光學補償之薄形 化偏光板可包括有：一偏光薄膜、一透明基板、一第一光 學補償膜及一第二光學補償膜。該偏光薄膜係可提供偏光 功能，該偏光薄膜並具有一上表面及一下表面。該透明基 板係直接貼覆於該偏光薄膜之上表面。該第—光學補償膜 係直接貼覆於該偏光薄膜之下表面。該第二光學補償膜係 結合在第一光學補償膜較遠離偏光薄膜之侧^其中，該第 一光學補償膜係滿足下列光學條件式：nx>ny=nz ;該第二 光學補償膜係滿足下列光學條件式：nx=ny<nz ;並且，該 第一光學補償膜與第二光學補償膜之組合更滿足下列光 學條件式： O.lnm < Ro(a)+Ro(b) < 220nm ； -270nm < Rth(a)+Rth(b) < ll〇nm ;以及 -3OOnm < Rth(a) <_ 1 Onm ; 其中，nx為表示在光學補償膜表面上之一 x軸方向 上之折射率、ny為表示在光學補償膜表面上之一 y軸方 向上之折射率、且nz為表示在光學補償膜厚度上之一 z 库由方向上之折射率;R〇⑻及Rth⑻係分別為第二光學補償 膜之R〇及Rth值，而R〇(b)及她⑼則係分別為第一光學 補你膜之R〇及Rth值；並且，R〇 = (nx-ny)*d ; Mi={(nx+ny)/2_nz}*d ;且d為光學補償膜之厚度。 【實施方式】 本發明之可提供光學補償之薄形化偏光板的主要原 9 1279596 理，主要是藉由在液晶顯示裝置之上偏光板上直接内建兩 片光學補償膜（Optical Compensatory Sheet)，不僅因為該 光學補償膜可取代偏光板原有之其中一片透明基板而使 得偏光板可相對更薄，可達到對IPS LCD在傾斜角度上 之對比及色偏問題加以改善者。 為使貴審查委員能對本發明之特徵、目的及功能有 更進一步的認知與瞭解，茲配合圖式詳細說明如後·· 請參閱圖三及圖四，分別為本發明之可提供光學補償 之薄形化偏光板設置在一液晶顯示裝置上的第一較佳實 施例剖面示意圖、以及該偏光板的製程流程圖。該液晶顯 示裝置20係包括有：一液晶元件21、一上偏光板22、以 及一下偏光板23。其中，於該上偏光板22中更内建有一 第一光學補償膜241及一第二光學補償膜242。 於本第一較佳實施例中，該液晶元件21 (Liquid Crystal Cell)可為一内平面轉換式（In-PlaneSwitching; 簡稱IPS)之液晶元件21為較I，所以其在傾斜角度（45 度與135度）方向上會有發生嚴重紅色色偏之情況。然 而’該液晶元件21也可能是TN (TwistedNematic)型或 MVA (M_Virtical Alignment)型的液晶元件者。該液晶元 件21 —般係由包括一玻璃基板以及多數分佈在該玻璃基 板上的液晶分子所構成，且該液晶元件21依據其液晶粒 子排列之方向性而係定義有一液晶排列方向211。於本第 一較佳實施例中，該液晶排列方向211即為如圖三箭頭符 號所示之左右水平方向。由於該液晶元件21係屬習知技 1279596 術且非為本發明之主要特徵，所以不贅述其詳細構成與功 能0133 constitutes. For example, the Republic of China Patent Publication No., No. 562955, No. 528882, No. 558643, and the US Patent No. US 6717642, both of which disclose the addition of an optical supplement board to a liquid crystal display device to increase the viewing angle range. A technology that shows quality. Each of the prior written cases is just like the conventional liquid crystal display shown in FIG. 2, which is separately produced by polarizing plates 12 and 13 and optical compensation plate 14, and then bonded together with adhesive. . Since the polarizing plates 12 and 13 and the optical supplemental plate 14 are separately produced, each of them needs at least one transparent substrate 122, 132, 141 to provide sufficient structural strength and hardness, and the polarizing plates 12 and 13 need to be up and down. Two transparent substrates 12, 122, and 132 are used to protect the polarizing films 123 and 133 from scratching. However, the more the number of transparent substrates used, the more the number of layers adhered by the adhesive, the more the overall thickness of the liquid crystal display device 10 is increased, and the light transmittance and optical characteristics are also worse, and there is still further The space for improvement. SUMMARY OF THE INVENTION The main object of the present invention is to provide a thinned polarizing plate that can provide optical compensation and a method for manufacturing the same by replacing two kinds of optical compensation films (optical compensatory sheets) on a polarizing plate instead of a polarizing plate. One of the original transparent substrates can not only make the polarizing plate relatively thinner, but also improve the contrast and color shift of the liquid crystal display device at the oblique angle. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a liquid crystal display device having a thinned polarizing plate which can provide optical compensation. 8 1279596 To achieve the above object, the thin polarizing plate of the present invention having optical compensation can include: a polarizing film, a transparent substrate, a first optical compensation film, and a second optical compensation film. The polarizing film provides a polarizing function, and the polarizing film has an upper surface and a lower surface. The transparent substrate is directly attached to the upper surface of the polarizing film. The first optical compensation film is directly attached to the lower surface of the polarizing film. The second optical compensation film is coupled to the side of the first optical compensation film that is farther away from the polarizing film. The first optical compensation film satisfies the following optical condition: nx> ny=nz; the second optical compensation film is satisfied. The following optical conditional formula: nx = ny <nz; and, the combination of the first optical compensation film and the second optical compensation film more satisfies the following optical conditional formula: O.lnm < Ro(a) + Ro(b) < 220 nm; -270 nm < Rth(a) + Rth(b) < ll 〇 nm ; and -3OOnm < Rth(a) < _ 1 Onm ; wherein nx is one of the surfaces on the optical compensation film x The refractive index in the axial direction, ny is a refractive index in one of the y-axis directions on the surface of the optical compensation film, and nz is a refractive index in the direction of one of the optical compensation film thicknesses; R 〇 (8) And Rth(8) are the R〇 and Rth values of the second optical compensation film, respectively, and R〇(b) and her(9) are the R〇 and Rth values of the first optical compensation film respectively; and, R〇=(nx -ny)*d; Mi={(nx+ny)/2_nz}*d; and d is the thickness of the optical compensation film. [Embodiment] The main original 9 1279596 of the optically compensated thinned polarizing plate of the present invention mainly comprises two optical compensation films (Optical Compensatory Sheet) built directly on the polarizing plate on the liquid crystal display device. The polarizing plate can be relatively thinner not only because the optical compensation film can replace one of the transparent substrates of the polarizing plate, but also can improve the contrast and color shift of the IPS LCD at an oblique angle. In order to enable the review committee to have a better understanding and understanding of the features, purposes and functions of the present invention, the detailed description of the drawings is as follows. Please refer to Figure 3 and Figure 4, respectively, which provide optical compensation for the present invention. A schematic cross-sectional view of a first preferred embodiment of a thinned polarizing plate disposed on a liquid crystal display device, and a process flow diagram of the polarizing plate. The liquid crystal display device 20 includes a liquid crystal element 21, an upper polarizing plate 22, and a lower polarizing plate 23. A first optical compensation film 241 and a second optical compensation film 242 are built in the upper polarizing plate 22. In the first preferred embodiment, the liquid crystal element 21 (Liquid Crystal Cell) can be an In-Plane Switching (IPS) liquid crystal element 21 which is I, so it is at an oblique angle (45 degrees). There will be a serious red color shift in the direction of 135 degrees). However, the liquid crystal element 21 may be a TN (Twisted Nematic) type or an MVA (M_Virtical Alignment) type liquid crystal element. The liquid crystal element 21 is generally composed of a liquid crystal molecule including a glass substrate and a plurality of liquid crystal molecules distributed thereon, and the liquid crystal element 21 defines a liquid crystal alignment direction 211 depending on the directivity of the arrangement of the liquid crystal particles. In the first preferred embodiment, the liquid crystal alignment direction 211 is the horizontal direction shown by the arrow symbol in FIG. Since the liquid crystal element 21 is a conventional technique and is not a main feature of the present invention, its detailed configuration and function will not be described.
該下偏光板23係設置於液晶元件21之一下側面上。 於本第一較佳實施例中，該下偏光板23係由包括：兩透 明基板23卜232以及夾置於該兩透明基板23卜232之間 的一偏光薄膜233所構成。該透明基板231、232之材質， 可使用業界習知之熱塑性樹脂為宜，但以機械強度、透濕 性、高度透明性、熱安定性及光學等向性等優異者為較 佳。此類透明基板23卜232具體實例如··三乙醯基纖維The lower polarizing plate 23 is provided on the lower side surface of one of the liquid crystal elements 21. In the first preferred embodiment, the lower polarizing plate 23 is composed of two transparent substrates 23 and 232 and a polarizing film 233 interposed between the transparent substrates 23 and 232. The material of the transparent substrates 231 and 232 is preferably a thermoplastic resin which is conventionally known in the art, but is excellent in mechanical strength, moisture permeability, high transparency, thermal stability, and optical isotropic properties. Specific examples of such a transparent substrate 23 232, such as · triethylene fluorene fiber
素、丙酿基纖維素等纖維素系樹脂、聚醯胺系、聚碳酸系、 聚酯系、聚苯乙稀系、聚丙稀酸系、聚降冰片稀系等之透 明樹脂。其中，由於對偏光板光學特性及耐熱、濕等耐候 性之考量，以表面經驗處理做皂化反應後之TAC (Triacetyl Acetate Cellulose)三乙醯基纖維素薄膜最佳。一A transparent resin such as a cellulose resin such as a cellulose or a propyl cellulose, a polyamidiamide type, a polycarbonate type, a polyester type, a polystyrene type, a polyacrylic acid type, or a polynorbornazole type. Among them, due to the optical properties of the polarizing plate and the weather resistance of heat resistance and humidity, the TAC (Triacetyl Acetate Cellulose) triethylenesulfonated cellulose film after the saponification reaction is preferably treated by surface experience. One
般而言’市售常見之TAC三乙酿基纖維素薄膜的R〇值一 般約介於0〜Smn之間，而其Rth值則是約介於35〜55腿 之間。該偏光薄膜233係為含聚乙_之pvA薄膜。將 蛾或二色物_如二色練被錄至m賴後加以拉 長’而成為具有特錢光效果之偏光薄膜233。並且該 下=板23依據其絲薄膜233於製程中被拉長的方向 2 tr延伸方向234 °於本第—較佳實施例中，該下偏 晶 iHP 234即_三所示之左右箭頭的方 侏2二y訂偏光板23之延伸方向234係與該液 夜晶排列方向211相同。由於此所述之透明 1279596 基板231、232與偏光薄膜233等技術也是屬於習知，故 以下將不再贅述其詳細構成與功效。 該上偏光板22係設置於液晶元件21之一上側面上。 於本第一較佳實施例中，該上偏光板22係由包括：一透 明基板221、該第一光學補償膜241、該第二光學補償膜 242、以及一偏光薄膜223。該透明基板221係直接貼覆 於偏光薄膜223之一上表面，第一光學補償膜241係直接 貼覆於偏光薄膜223之一下表面，而第二光學補償膜242 則是結合在第一光學補償膜241較遠離偏光薄膜223之 侧。因此，該偏光薄膜223係夾置於該透明基板221與第 一光學補償膜241之間而構成該上偏光板22。由於此所 述之上偏光板22的透明基板221與偏光薄膜223兩元件 大致上與前述下偏光板23類似，所以不再贅述其相同元 件之詳細内容。其唯一不同點在於，該上偏光板22之偏 光薄膜223的延伸方向224係如圖三所示之貫穿圖面的方 向。因此，上偏光板22之偏光薄膜223的延伸方向224 孫與該液晶元件21之液晶排列方向211相互垂直者。所 以，下偏光板23之偏光薄膜233的延伸方向234也是和 上偏光板22之偏光薄膜223的延伸方向224相互垂直者。 於圖三所示之本第一較佳實施例中，該第一光學補償 膜241與第二光學補償膜242係内建於上偏光板22内且 係夾置於上偏光板22之偏光薄膜223與液晶元件21之上 侧面之間。該兩光學補償膜241 ' 242係分別可對特定波 長之光產生預定角度與方向之阻滯，例如對45度與135 12 1279596 ί =^^^上之&相歧雜度提供調整與補 ^，進而改善1PS液晶顯示震置2〇於傾斜角度上的红色 色偏與對比度現象。於本第—較佳實施例中，該第一光學 補伽241可以是將一透明高分子薄膜於浸泡染料後在 做方向上加以延伸拉扯，而使第一光學補償膜241可滿 AT縣學條件式：nx>ny=nz。其巾，ηχ絲示在光學 補伽表面上之- χ軸方向上之折射率、吵為表示在光 • 學補償膜表面上之—y軸方向上之折射率、且nz為表示 核學補伽厚度上之-z財向上之折料。而滿足此 、 所述之nx>ny=nz光學條件式的第-光學補償膜％卜於 #界通常可被簡稱為A-plate。由第-光學補償膜241於 製程中的拉扯方向可定義一最大折射率方向24心於圖三 所示’該第一光學補償膜241之最大折射率方向244係與 液晶元件21之液晶排列方向211相同。 至於’該第一光學補償膜242則可藉由在透明高分子 瞻 薄膜上塗覆配向層與液晶材料並使液晶材料沿一特定方 向排列所製成，而使第二光學補償膜242可滿足下列光學 條件式：nx=ny<nz。而滿足此所述之nx=ny<nz光學條件 式的第二光學補償膜242於業界通常可被簡稱為c+ Plate。於圖三所示之本發明之第一較佳實施例中，該第二 光學補償膜242於製程中之液晶材料排列方向係為圖三 之上下垂直方向。所以，第二光學補償膜242之液晶材料 排列方向係與液晶元件21之液晶排列方向211以及上偏 光板22之偏光薄膜223的延伸方向224兩者均相互垂直。 13 1279596 於本第一較佳實施例中，該第一光學補償膜241與第 二光學補償膜242之組合係滿足下列光學條件式： O.lnm < Ro(a)+Ro(b) < 220nm ； •270nm < Rth⑻+Rth(b) < 110nm ;以及 -300nm < Rth(a) <-10nm ； 其中，Ro⑻及Rth(a)係分別為第二光學補償膜之R〇 及Rth值，而R〇(b)及Rth(b)則係分別為第一光學補償膜 之 Ro 及 Rth 值；並且，R〇 = (nx_ny)*d ;Generally, the commercially available TAC triethyl cellulose fiber film generally has an R value between about 0 and Smn, and an Rth value of between about 35 and 55 legs. The polarizing film 233 is a pvA film containing polyethylene. A moth or a dichroic material such as a two-color paint is recorded and then stretched to become a polarizing film 233 having a special light effect. And the lower=plate 23 extends in the direction 2 tr of the elongated direction 2 tr of the silk film 233 in the process. In the preferred embodiment, the lower polarized iHP 234 is the left and right arrows shown by the third The extending direction 234 of the square yoke 2 polarizing plate 23 is the same as the liquid crystal arranging direction 211. Since the transparent 1279596 substrate 231, 232 and the polarizing film 233 are also known in the art, the detailed configuration and efficacy thereof will not be described below. The upper polarizing plate 22 is provided on one upper surface of the liquid crystal element 21. In the first preferred embodiment, the upper polarizing plate 22 includes a transparent substrate 221, the first optical compensation film 241, the second optical compensation film 242, and a polarizing film 223. The transparent substrate 221 is directly attached to the upper surface of one of the polarizing films 223, the first optical compensation film 241 is directly attached to the lower surface of one of the polarizing films 223, and the second optical compensation film 242 is bonded to the first optical compensation. The film 241 is farther from the side of the polarizing film 223. Therefore, the polarizing film 223 is interposed between the transparent substrate 221 and the first optical compensation film 241 to constitute the upper polarizing plate 22. Since the two elements of the transparent substrate 221 and the polarizing film 223 of the upper polarizing plate 22 are substantially similar to the lower polarizing plate 23, the details of the same elements will not be described again. The only difference is that the extending direction 224 of the polarizing film 223 of the upper polarizing plate 22 is in the direction of the drawing as shown in FIG. Therefore, the extending direction 224 of the polarizing film 223 of the upper polarizing plate 22 is perpendicular to the liquid crystal alignment direction 211 of the liquid crystal element 21. Therefore, the extending direction 234 of the polarizing film 233 of the lower polarizing plate 23 is also perpendicular to the extending direction 224 of the polarizing film 223 of the upper polarizing plate 22. In the first preferred embodiment shown in FIG. 3, the first optical compensation film 241 and the second optical compensation film 242 are built in the upper polarizing plate 22 and are sandwiched between the polarizing films of the upper polarizing plate 22. 223 is between the upper surface of the liquid crystal element 21. The two optical compensation films 241 242 respectively can generate a predetermined angle and direction block for light of a specific wavelength, for example, provide adjustment and compensation for the & phase dissimilarity at 45 degrees and 135 12 1279596 ί =^^^. ^, thereby improving the red color shift and contrast phenomenon of the 1PS liquid crystal display 2 〇 tilt angle. In the first preferred embodiment, the first optical compensation 241 may extend and pull a transparent polymer film in the direction of the immersion dye, so that the first optical compensation film 241 can be filled with AT County. Conditional expression: nx> ny=nz. The towel, the χ silk is shown on the surface of the optical complementary gamma - the refractive index in the direction of the x-axis, the noisy indicates the refractive index in the y-axis direction on the surface of the optical compensation film, and nz is the nuclear complement The gamma thickness of the -z financial upwards. The first optical compensation film which satisfies the above-mentioned nx>ny=nz optical conditional formula can be simply referred to as A-plate. The direction of pulling of the first optical compensation film 241 in the process can define a direction of maximum refractive index 24. The maximum refractive index direction 244 of the first optical compensation film 241 and the liquid crystal alignment direction of the liquid crystal element 21 are shown in FIG. 211 is the same. As for the first optical compensation film 242, the second optical compensation film 242 can satisfy the following steps by coating the alignment layer and the liquid crystal material on the transparent polymer film and aligning the liquid crystal material in a specific direction. Optical conditional formula: nx = ny < nz. The second optical compensation film 242 which satisfies the above-described nx=ny<nz optical condition is generally referred to in the industry as c+ Plate. In the first preferred embodiment of the present invention shown in FIG. 3, the alignment direction of the liquid crystal material in the second optical compensation film 242 is in the vertical direction above and below the third embodiment. Therefore, the alignment direction of the liquid crystal material of the second optical compensation film 242 is perpendicular to both the liquid crystal alignment direction 211 of the liquid crystal element 21 and the extending direction 224 of the polarizing film 223 of the upper polarizing plate 22. 13 1279596 In the first preferred embodiment, the combination of the first optical compensation film 241 and the second optical compensation film 242 satisfies the following optical condition: O.lnm < Ro(a)+Ro(b) < 220 nm; • 270 nm < Rth(8) + Rth(b) < 110 nm ; and -300 nm < Rth(a) < -10 nm ; wherein Ro(8) and Rth(a) are respectively R of the second optical compensation film And Rth value, and R〇(b) and Rth(b) are respectively Ro and Rth values of the first optical compensation film; and, R〇=(nx_ny)*d;
Rth={(nx+ny)/2_nz}*d ;且d為光學補償臈之厚度。 猎由在上偏光板22内建符合前述光學條件式之第— 光學補償膜241與第二光學補償膜242，將可使IPSLCD 在傾斜角度上之對比及色偏問題加以改善。同時，也由於 第一光學補償膜241與第二光學補償膜242係直揍貼覆在 上偏光板22之偏光薄膜223下表面而取代其原庳有之一 片透明基板。因此，本發明將可較傳統偏光板係將單獨生 產之光學補償膜額外貼在偏光板上的習用技術結構相對 更薄。 請參閱圖四，為如圖三所示之本發明可提供光學補償 之薄形化偏光板的製程流程圖。如圖四所示，本發明可提 供光學補償之薄形化偏光板的製造方法，包括有： 步驟31 :提供一第一光學補償膜241 ; 步驟32 :於該第一光學補償膜241上依序塗覆一配向 層2421及一液晶材料層2422，該配向層 2421與液晶材料2422之组合實質上係在該 •1279596 帛-光學補償膜241上形成一第二光學補償 膜242 :由於在第一較佳實施例中，該第二 光學補償膜242係直接形成於第一光學麵 膜241上，所以其兩者之間並無任何其他介 質；以及 步驟33 :將形成有第二光學補償膜242的第一光學補 償膜241，與一偏光薄膜223以及一透明基 板221相結合，使偏光薄膜223被夾置於透 明基板221與第一光學補償膜241之間，而 構成該可提供光學補償之偏光板。而此偏光 板也就是符合如圖三所示之第一較佳實施 例的上偏光板22。 請參閱圖五及圖六’分別為本發明之可提供光學補償 之薄形化偏光板設置在一液晶顯示裝置上的第二較佳實 施例剖面示意圖、以及該偏光板的製程流程圖。該液晶顯 示裝置40同樣係包括有：一液晶元件41、一上偏光板42、 以及一下偏光板43。其中，於該上偏光板42中也同樣内 建有一第一光學補償膜441及一第二光學補償膜442。於 第二較佳實施例中，該上偏光板42同樣具有一透明基板 421、該第一光學補償膜441、該第二光學補償膜442、以 及夾置於透明基板421與第一光學補償膜441之間的一偏 光薄膜423。同樣地’該下偏光板43也是具有兩透明基 板以及夾置於兩透明基板431、432之間的一偏光薄膜 433。由於此所述之液晶元件41、第一光學補償膜441、 15 1279596 第二光學補償膜442、透明基板421、431、432、及偏光 /專膜423、433 ’其材料與光學條件大致上係相同於如圖 三所示之第一較佳實施例，所以不再贅述。如圖五所示之 薄形化偏光板第二較佳實施例的唯一不同點，乃在於該第 —光學補償膜441與第二光學補償膜442之間更包括有一 層壓力感應黏膠 443 (Pressure Sensitive Adhesive ;簡稱 PSA或俗稱水膠）。於本第二較佳實施例中之所以會多出 一層壓力感應黏膠443，主要是因製程上的不同所致，而 如圖五所示之薄形化偏光板第二較佳實施例的製程步騾 則是如圖六所示： 步驟51 :提供一基材445、一第一光學補償膜441、 一偏光薄膜423及一透明基板421 ; 步驟52 :於該基材445上並依序塗覆一配向層4421 及一液晶材料層4422，該配向層4421與液 晶材料4422之組合實質上係在該基材445 上形成一第二光學補償膜442 ;另將偏光薄 膜423被夾置於透明基板421與第一光學補 償膜441之間，以構成一偏光板結構；此時， 具有第二光學補償膜442之該基材445、以 及具有透明基板42卜偏光薄膜423與第一 光學補償膜441之偏光板，其兩者均可被單 獨輸送、儲存及販售者； 步驟53 ··將由第一光學補償膜441、偏光薄膜423及 透明基板421所構成之該偏光板結構，藉由 Ϊ279596 壓力感應黏膠（PSA) 443與該第二光學補 償膜442相貼合，使第二光學補償膜442透 過壓力感應黏膠443與第一光學補償膜441 相鄰罪’而該基材445則是暴露於最外層； 以及， 步驟54 :將該基材445去除，使第二光學補償膜442 透過壓力感應黏膠443貼覆在該偏光板結構 上。 唯以上所述之實施例不應用於限制本發明之可應用 範圍，本發明之保護範圍應以本發明之申請專利範圍内容 所界定技術精神及其均等變化所含括之範圍為主者。即大 凡依本發明申請專利範圍所做之均等變化及修飾，仍將不 失本發明之要義所在，亦不脫離本發明之精神和範圍，故 都應視為本發明的進一步實施狀況。 【圖式簡單說明】 圖A係為一典型的傳統液晶顯示器的剖面示意圖。 圖一 B係為傳統lps技術之液晶顯示裝置在晝面全累 田一的狀態下，其色彩分佈狀態之曲線圖。 圖二係為習知於液晶顯示器上增設光學補償板的剖面 示意圖。 圖三=本發明之可提供光學補償之薄形化偏光板設 液晶顯示裝置上的第一較佳實施例剖面示 17 ，1279596 圖四係為如圖三所示之本發明之薄形化偏光板第一較 佳實施例的製程流程圖。 圖五係為本發明之可提供光學觀之薄形化偏光板設 置在一液晶顯示裴置上的第二較佳實施例剖面示 意圖。 圖六如圖五所示之本發明之薄形化偏光板第二較佳實 施例的製程流程圖。 【主要元件符號說明】 10習知液晶顯示器 111液晶元件 12、13偏光板 123、133偏光膜 121、122、131、132、141 透明基板 14光學補償板 142、143光線阻滯薄膜 20、40液晶顯示裝置 2卜41液晶元件 211、411液晶排列方向 22、42上偏光板 22卜23卜232、441、43卜432透明基板 223、 233、423、433 偏光薄膜 224、 234延伸方向 23、43下偏光板 241、 441第一光學補償膜 242、 442第二光學補償膜 244最大折射率方向 443壓力感應黏膠 31〜33、51〜54步驟Rth={(nx+ny)/2_nz}*d ; and d is the thickness of the optical compensation 臈. The optical compensation film 241 and the second optical compensation film 242, which are built in the upper polarizing plate 22 in accordance with the aforementioned optical condition, can improve the contrast and color shift of the IPSLCD at an oblique angle. At the same time, the first optical compensation film 241 and the second optical compensation film 242 are directly attached to the lower surface of the polarizing film 223 of the upper polarizing plate 22 instead of the original one. Therefore, the present invention is relatively thinner than conventional optical structures in which an optical compensation film produced separately is attached to a polarizing plate in comparison with a conventional polarizing plate. Referring to FIG. 4, it is a process flow diagram of the thinned polarizing plate of the present invention which can provide optical compensation as shown in FIG. As shown in FIG. 4, the present invention provides a method for manufacturing an optically compensated thinned polarizing plate, comprising: Step 31: providing a first optical compensation film 241; Step 32: Depending on the first optical compensation film 241 An alignment layer 2421 and a liquid crystal material layer 2422 are sequentially coated, and the combination of the alignment layer 2421 and the liquid crystal material 2422 substantially forms a second optical compensation film 242 on the 1279596 帛-optical compensation film 241: In a preferred embodiment, the second optical compensation film 242 is formed directly on the first optical mask 241 so that there is no other medium therebetween; and step 33: a second optical compensation film is formed. The first optical compensation film 241 of 242 is combined with a polarizing film 223 and a transparent substrate 221, so that the polarizing film 223 is sandwiched between the transparent substrate 221 and the first optical compensation film 241, and the optical compensation is provided. Polarized plate. The polarizing plate is also the upper polarizing plate 22 of the first preferred embodiment as shown in Fig. 3. Referring to FIG. 5 and FIG. 6 respectively, FIG. 5 is a cross-sectional view showing a second preferred embodiment of the thinned polarizing plate for optical compensation provided on a liquid crystal display device, and a process flow chart of the polarizing plate. The liquid crystal display device 40 also includes a liquid crystal element 41, an upper polarizing plate 42, and a lower polarizing plate 43. A first optical compensation film 441 and a second optical compensation film 442 are also built in the upper polarizing plate 42. In the second preferred embodiment, the upper polarizing plate 42 also has a transparent substrate 421, the first optical compensation film 441, the second optical compensation film 442, and the transparent substrate 421 and the first optical compensation film. A polarizing film 423 between 441. Similarly, the lower polarizing plate 43 is also a polarizing film 433 having two transparent substrates and sandwiched between the transparent substrates 431 and 432. The material and optical conditions of the liquid crystal element 41, the first optical compensation film 441, the 15 1279596 second optical compensation film 442, the transparent substrates 421, 431, 432, and the polarizing/film 423, 433' are generally The same as the first preferred embodiment shown in FIG. 3, and therefore will not be described again. The only difference between the second preferred embodiment of the thinned polarizing plate shown in FIG. 5 is that a pressure sensitive adhesive 443 is further included between the first optical compensation film 441 and the second optical compensation film 442 ( Pressure Sensitive Adhesive; referred to as PSA or commonly known as water gel). In the second preferred embodiment, a layer of pressure-sensitive adhesive 443 is added, mainly due to the difference in process, and the second preferred embodiment of the thinned polarizing plate shown in FIG. The process step is as shown in FIG. 6 : Step 51 : providing a substrate 445 , a first optical compensation film 441 , a polarizing film 423 and a transparent substrate 421 ; Step 52 : on the substrate 445 and sequentially An alignment layer 4421 and a liquid crystal material layer 4422 are coated. The combination of the alignment layer 4421 and the liquid crystal material 4422 substantially forms a second optical compensation film 442 on the substrate 445. The polarizing film 423 is further sandwiched. The transparent substrate 421 and the first optical compensation film 441 are configured to form a polarizing plate structure; at this time, the substrate 445 having the second optical compensation film 442, and the polarizing film 423 having the transparent substrate 42 and the first optical compensation The polarizing plate of the film 441, both of which can be separately transported, stored, and sold; Step 53: The polarizing plate structure composed of the first optical compensation film 441, the polarizing film 423, and the transparent substrate 421 is Ϊ279596 Pressure Sensitive Adhesive (PSA) 443 The second optical compensation film 442 is attached so that the second optical compensation film 442 is adjacent to the first optical compensation film 441 through the pressure-sensitive adhesive 443, and the substrate 445 is exposed to the outermost layer; and, the step 54: The substrate 445 is removed, and the second optical compensation film 442 is pasted on the polarizing plate structure through the pressure-sensitive adhesive 443. The above-mentioned embodiments are not intended to limit the scope of application of the present invention, and the scope of the present invention should be based on the technical spirit defined by the content of the patent application scope of the present invention and the scope thereof. It is to be understood that the scope of the present invention is not limited by the spirit and scope of the invention, and should be considered as a further embodiment of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Figure A is a schematic cross-sectional view of a typical conventional liquid crystal display. Figure 1 B is a graph of the color distribution state of the liquid crystal display device of the conventional lps technology in the state where the kneading surface is fully loaded. Figure 2 is a schematic cross-sectional view showing the addition of an optical compensation plate to a liquid crystal display. Figure 3 is a cross-sectional view showing a first preferred embodiment of a thinned polarizing plate provided with optical compensation according to the present invention. The liquid crystal display device of the present invention is shown in Fig. 3, which is a thinned polarized light of the present invention as shown in Fig. 3. A process flow diagram of the first preferred embodiment of the board. Figure 5 is a cross-sectional view showing a second preferred embodiment of the present invention for providing an optically thinned polarizing plate disposed on a liquid crystal display device. Figure 6 is a flow chart showing the process of the second preferred embodiment of the thinned polarizing plate of the present invention as shown in Figure 5. [Main component symbol description] 10 conventional liquid crystal display 111 liquid crystal element 12, 13 polarizing plate 123, 133 polarizing film 121, 122, 131, 132, 141 transparent substrate 14 optical compensation plate 142, 143 light blocking film 20, 40 liquid crystal Display device 2, liquid crystal element 211, 411, liquid crystal alignment direction 22, 42 on polarizing plate 22, 23 232, 441, 43 432 transparent substrate 223, 233, 423, 433 polarizing film 224, 234 extending direction 23, 43 Polarizing plate 241, 441 first optical compensation film 242, 442 second optical compensation film 244 maximum refractive index direction 443 pressure sensing adhesive 31~33, 51~54 steps