1307786 九、發明說明： .【發明所屬之技術領域】 本發明係有關於一種偏光板(polarizing sheet)的製造方 法’且特別有關一種提升偏光板剛性（stiffness；^方法。 【先前技術】1307786 IX. Description of the Invention: 1. Field of the Invention The present invention relates to a method of manufacturing a polarizing sheet and particularly relates to a method for improving the rigidity of a polarizing plate. [Prior Art]
偏光板(polarizing sheet)或稱偏光膜(p〇iarizing fjjm)是 液晶顯示器（liquid crystal display )的重要元件之一，其用 途是使通過偏光膜的光線產生偏振性(p〇larizati〇n)，將非 偏極化的自然光線轉換成偏極光，透過液晶的轉向後，產 生明暗的影像效果。目前液晶顯示器常用的偏光板，是利 用透光性良好的高分子薄膜，通常使用聚乙鱗㈣_㈣ A1=〇1，PVA)，先將膜内分子加以延料向（odentation)， 再汉染具二色性的染料’使附著染料的聚乙烯醇薄膜可對 特定偏振方向的光吸收，達到偏光效果。 由於聚乙烯醇薄膜的耐濕性及耐熱性不良，且 伸後機械性質會降低變得容易跪裂，因此爲保護色後 的偏光特性及物理性質，通常在聚乙烯醇__各 上-層Μ透光性、耐雜又__度的三_ ^吻1 We，TAC)薄膜作為保護聚 膜的= 用。-般為增加貼合後㈣度，三醋 ^力 广。se，TAC则會纽㈣峰㈣d二 處理後，再藉由黏著劑與聚乙埽醇薄膜貼合一 圖’其絲示偏光板之結構，-三層偏騎=A polarizing sheet or a polarizing film (p〇iarizing fjjm) is one of the important components of a liquid crystal display, and its purpose is to cause polarization of light passing through a polarizing film (p〇larizati〇n). The non-polarized natural light is converted into polarized light, and after the liquid crystal is turned, a bright and dark image effect is produced. At present, a polarizing plate commonly used for liquid crystal displays is a polymer film which is excellent in light transmittance, and usually uses polystyrene (4) _(4) A1=〇1, PVA), and the molecules in the film are first extended to odentation, and then dyed with The dichroic dye' enables the dye-attached polyvinyl alcohol film to absorb light in a specific polarization direction to achieve a polarizing effect. The polyvinyl alcohol film is poor in moisture resistance and heat resistance, and the mechanical properties after stretching are reduced to become easily cleaved. Therefore, in order to protect the color after polarization characteristics and physical properties, usually in the polyvinyl alcohol __ each layer三 Μ 吻 We We We We We We We We We We We We We We We We We We We We We We We We We We We - Generally, after adding the fit (four degrees), the three vinegars are powerful. Se, TAC will be New (four) peak (four) d two after treatment, and then adhered to the polyethylene film by an adhesive film, its silk-based polarizing plate structure, - three-layer partial riding =
0659-Α21315TWF(N2);M05025;CLAIRE 1307786 體10，通常使用聚乙烯醇(PVA)薄膜，其上下分別被上保 護層12及下保護層14所覆蓋，通常使用三醋酸纖維素 (TAC)薄膜。然而，貼合後的三層偏光板可能會發生剝離、 在高溫或低溫下變形、或是在後續製程中的自動貼合取片 時發生黏片現象。 — [發明内容】 爲改善上述可能發生的現象，本發明的實施例提供一 種偏光板製造方法，包括··提供一偏光基體、一第—保護 膜及一第二保護膜；增加第一保護膜及第二保護膜之張 力；以及將已增加張力之第一保護膜及第二保護膜分別貼 合於偏光基體之兩側。 本發明的實施例再提供一種偏光板製造方法，包括： 提供一偏光基體、一第一保護膜及一第二俤護膜；提供一 第一滾輪組以夾合第一保護膜，以及提供_第二滚輪組以 失合第二保護膜；以第一滾輪組及一第四滾輪租對第一保 護膜夾合轉動以施加一第—拉伸應力，以第二滚輪組及第 四滾輪組對第二保護膜夾合轉動以施加一第二拉伸應力； 提供一黏著劑以將第一保護膜及第二保護腠分别黏著於偏 光基體之兩側，並且以一第三滾輪組使第/保護膜、第二 保s蒦膜及偏光基體貼合；以及對貼合後之第〆保護無、第 二保護膜及偏光基體釋放張力。σ 卜本發明的實施例提供—種偏光板製造譟備，包括：一 第一滾輪組，用以夾合一第一保護膜，·一第二滚輪組，設0659-Α21315TWF(N2); M05025; CLAIRE 1307786 Body 10, usually using a polyvinyl alcohol (PVA) film, which is covered by the upper protective layer 12 and the lower protective layer 14 respectively, usually using a cellulose triacetate (TAC) film. . However, the laminated three-layer polarizing plate may be peeled off, deformed at a high temperature or a low temperature, or may be stuck when the film is automatically attached in a subsequent process. [Invention] In order to improve the above-mentioned possible phenomenon, an embodiment of the present invention provides a method for manufacturing a polarizing plate, comprising: providing a polarizing substrate, a first protective film and a second protective film; and adding a first protective film And tension of the second protective film; and bonding the first protective film and the second protective film with increased tension to the two sides of the polarizing substrate. The embodiment of the present invention further provides a method for manufacturing a polarizing plate, comprising: providing a polarizing substrate, a first protective film, and a second protective film; providing a first roller set to sandwich the first protective film, and providing _ The second roller group is configured to lose the second protective film; the first roller group and the fourth roller are rented to rotate the first protective film to apply a first tensile stress to the second roller group and the fourth roller group Rotating the second protective film to apply a second tensile stress; providing an adhesive to adhere the first protective film and the second protective ridge to the two sides of the polarizing substrate, and making the third roller group / Protective film, second protective film and polarizing substrate bonding; and the first protective film after bonding, the second protective film and the polarizing substrate release tension. The embodiment of the present invention provides a polarizing plate manufacturing noise preparation, comprising: a first roller set for clamping a first protective film, and a second roller set;
0659-A21315TWF(N2);M05025;CLAIRE 6 1307786 - 置於第一滾輪組之相對侧，用以夾合一第二保護膜；一第 . 三滾輪組，設置於第一滾輪組與第二滾輪組之間，以將第 一保護膜及第二保護膜分別貼合於一偏光基體之兩侧，形 成一三層偏光板；以及一第四滚輪組，用以夾合三層偏光 板，以與第一滚輪組形成一第一拉伸應力及與第二滚輪組 形成一第二拉伸應力。 為使本發明的操作方法和目的、優點能更明顯易懂， 以下配合圖式以及較佳實施例，以更詳細地說明本發明： 【實施方式】 第2圖係繪示本發明之偏光基體薄膜與其上下保護薄 膜的貼合機構。首先，一上保護薄膜42經由一第一滾輪组 58予以夾合，同時，一下保護薄膜44經由一第二滾輪組 60予以夾合。之後，一偏光基體40藉由黏著劑56並經過 一第三滾輪組46使偏光基體40之上下兩側分別與上、下 保護薄膜42、44緊密貼合。隨後，貼合後之偏光基體40 及上、下保護薄膜42、44依序進入第四滚輪組48及第五 滾輪組50。 在貼合的過程中，第一滾輪組58及第四滾輪組48係 具有不同的轉速轉動以提供上保護薄膜42第一拉伸應 力，其目的是為了在與偏光基體40貼合前提高上保護薄膜 42之張力，相同的，第二滾輪組58及第四滾輪組48係具 有不同的轉速轉動以提供下保護薄膜42第二拉伸應力，其 目的是為了在與偏光基體40貼合前提高下保護薄膜42之 0659-A21315TWF(N2);M05025;CLAIRE 7 1307786 張力。當上下保護薄膜42、44的張力提升後，再經由滚輪 組46提供貼合作用以形成三層偏光板68。從第—滾 輪組58(或第二滚輪組60)到第四滚輪組48 膜42(或下保護薄膜44)在貼合前即虚 " 1示邊厚 a炎向張力，因此，盆 與偏光基體40的貼合性更佳且剛性也釋彳θ ，、 保持三層偏光板68穩定的剛性，可餘 f °此外’爲 其中’第四滾輪組48與第五滾輪級 评欲乂驟 . ,, 置的目的gp 1 # 處於高張力的偏光板之張力逐漸釋放， 」I疋從 輪組50與第四滾輪組48之轉速差來甚 可利用第五滾 木座生一小於莖一岛楚 二拉伸應力之第三拉伸應力，以緩悴德 、一弟 之張力。在本實施例中，第一及第二 為 700_2000 公斤力（Kgf)。 請參閱第2圖，在-較佳實施例中，可 輪組46及第四滾輪組48或第四滚輪組48 m 50之間，分別設置一第一烘箱52及μ _ u年立展輻組 弟一烘箱54，#搭目太 合後之偏光基體40及上、下保護薄 便付貼 叉嘮膜42、.44之^的&荽 劑56烘乾，以便讓偏光基體40之上π 者 上下兩側與上、下保缚 薄膜42、44黏合的更為牢固。一般而言， 卜保°隻 上述第一烘箱之 %釋放三層偏光板68 拉伸應力之較佳設定 烘箱之烘烤溫度則 烘烤溫度可設定為50至75°C，而第 可設定為60至90°C。 其中’偏光基體薄膜40可為一高分早键^ 刀于潯膜，例如聚乙 烯醇(？〇^11^1八1〇〇11〇卜？¥入）。上保護薄膜42及下保媒 薄膜44可為三醋酸纖維素(triacetyl cellulose，TAC)薄膜。 黏著劑則可使用一水膠。在本例中，三層偏光板的剛性是 0659-A21315TWF(N2);M05025;CLAIRE 8 1307786 由三醋酸纖維素提供，而當三醋酸纖維素具有良好的剛性 .4 ’偏光板較能抵抗因溫度變化所引起聚乙烯醇強烈的縮 服現象。由於PVA在溫度變化下之收縮容易引起液晶顯示 器在暗態時產生漏光的現象，而導致晝面產生不均勻，因 此偏光板剛性的提升有助於液晶顯示器晝面的穩定性。 在本發明設計之貼合機構中，上、下保護薄膜42、44 未與偏光基體40貼合之前，先分別以第一滚輪組58(或第 鲁二滾輪組60)及第四滾輪組48施予第一拉伸應力（或第二拉 伸應力），目的是在貼合前先增加上、下保護薄膜42、44 之張力。當上、下保護薄膜42、44在高張力下藉由快速乾 硬的黏著劑56將其與偏光基體4〇緊密黏著，這使得滾輪 組58、60與48提供的應力藉由黏著劑56儲存於偏光基體 4〇及上、下保護薄膜42、44之間，而達到偏光板剛性的 提升。 偏光板剛性的提升也就代表在高溫下不易變形。當偏 φ光板党到溫度的變化而發生縮脹的現象時，偏光基體的膨 脹係數比其兩側之保護薄膜大，因此當縮脹得最嚴重的偏 光，體欲變形時，因承受張力而提升剛性的保護薄膜藉由 黏著刎貼合於偏光基體之兩側，.可抑制偏光基體之強烈的 ，脹，如此，偏光板可對抗溫度變化下造成的縮脹現象而 提升剛性。偏光板剛性的提升可改善液晶顯示器在暗態時 漏光的現象，有助於提升液晶顯示器晝面的穩定性。並且， 對於後續液晶顯示器製程的自動貼合取片時會較不易產生 黏片.。 0659-A213l5TWF(N2);M05025;CLAIRE 9 1307786 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何熟習此技藝者，在不脫離本發明之精神 和範圍内，當可作更動與潤飾，因此本發明之保護範圍當 視後附之申請專利範圍所界定者為準。0659-A21315TWF(N2); M05025; CLAIRE 6 1307786 - placed on the opposite side of the first roller set for clamping a second protective film; a third roller set, disposed on the first roller set and the second roller Between the groups, the first protective film and the second protective film are respectively attached to two sides of a polarizing substrate to form a three-layer polarizing plate; and a fourth roller group for sandwiching the three polarizing plates to Forming a first tensile stress with the first roller set and a second tensile stress with the second roller set. In order to make the operation method, the object and the advantages of the present invention more obvious, the present invention will be described in more detail below with reference to the drawings and the preferred embodiments. FIG. 2 shows the polarizing substrate of the present invention. The bonding mechanism of the film and the upper and lower protective film. First, an upper protective film 42 is sandwiched by a first roller set 58 while the lower protective film 44 is sandwiched by a second roller set 60. Thereafter, a polarizing substrate 40 is adhered to the upper and lower protective films 42, 44 by the upper and lower sides of the polarizing substrate 40 via the adhesive 56 and through a third roller set 46, respectively. Subsequently, the bonded polarizing substrate 40 and the upper and lower protective films 42 and 44 sequentially enter the fourth roller group 48 and the fifth roller group 50. During the lamination process, the first roller set 58 and the fourth roller set 48 have different rotational speeds to provide the first tensile stress of the upper protective film 42 for the purpose of improving the alignment with the polarizing substrate 40. The tension of the protective film 42 is the same, and the second roller set 58 and the fourth roller set 48 have different rotational speeds to provide the second tensile stress of the lower protective film 42 for the purpose of being bonded to the polarizing substrate 40. The lower protective film 42 is raised to 0659-A21315TWF(N2); M05025; CLAIRE 7 1307786 tension. When the tension of the upper and lower protective films 42, 44 is increased, the roller group 46 is further provided to form a three-layer polarizing plate 68. From the first roller set 58 (or the second roller set 60) to the fourth roller set 48, the film 42 (or the lower protective film 44) is imaginary before the fit. The adhesion of the polarizing substrate 40 is better and the rigidity is also released θ, and the rigidity of the three-layer polarizing plate 68 is maintained, and the remaining width of the polarizing plate 68 can be further reduced, and the 'fourth roller group 48 and the fifth roller level are evaluated. . , , the purpose of the gp 1 # tension in the high tension of the polarizing plate is gradually released, "I 疋 from the rotation of the wheel set 50 and the fourth roller set 48 difference, so that the fifth roller can be used to produce a smaller than the stem island The third tensile stress of the tensile stress of Chu is to relieve the tension of the younger brother and the younger brother. In the present embodiment, the first and second are 700_2000 kg force (Kgf). Referring to FIG. 2, in the preferred embodiment, between the wheel set 46 and the fourth roller set 48 or the fourth roller set 48 m 50, a first oven 52 and a μ _ y The group brothers are in an oven 54, and the polarizing substrate 40 and the upper and lower protective thinners are attached to the fork film 42 and the 44 of the tincture 56 to be dried to allow the polarizing substrate 40 to be placed thereon. The upper and lower sides of the π are more firmly bonded to the upper and lower securing films 42, 44. In general, the bake temperature is only 50% of the first oven, and the release temperature of the three sets of polarizing plates 68 is preferably set. The baking temperature can be set to 50 to 75 ° C, and the first can be set to 60 to 90 ° C. Wherein the polarizing substrate film 40 can be a high-altitude early-bonding film, such as polyvinyl alcohol (???11?1?8?11?11???). The upper protective film 42 and the lower protective film 44 may be a triacetyl cellulose (TAC) film. A glue can be used for the adhesive. In this example, the rigidity of the three-layer polarizer is 0659-A21315TWF(N2); M05025; CLAIRE 8 1307786 is provided by cellulose triacetate, and when cellulose triacetate has good rigidity, the 4' polarizer is more resistant to The change in temperature causes a strong shrinkage of polyvinyl alcohol. Since the shrinkage of the PVA under temperature changes easily causes light leakage in the dark state of the liquid crystal display, resulting in unevenness of the kneading surface, the rigidity of the polarizing plate contributes to the stability of the liquid crystal display. In the bonding mechanism of the present invention, before the upper and lower protective films 42 and 44 are not attached to the polarizing substrate 40, the first roller group 58 (or the second roller group 60) and the fourth roller group 48 are respectively used. The first tensile stress (or the second tensile stress) is applied in order to increase the tension of the upper and lower protective films 42, 44 before bonding. When the upper and lower protective films 42, 44 are adhered to the polarizing substrate 4 by a fast dry adhesive 56 under high tension, the stress provided by the roller sets 58, 60 and 48 is stored by the adhesive 56. The polarization of the polarizing plate is improved between the polarizing substrate 4 and the upper and lower protective films 42 and 44. The increase in the rigidity of the polarizer means that it is not easily deformed at high temperatures. When the φ plate is tempered by the change of temperature, the expansion coefficient of the polarizing substrate is larger than that of the protective film on both sides. Therefore, when the swell is the most severe polarized light, the body is deformed due to the tension. The protective film for improving rigidity is adhered to both sides of the polarizing substrate by adhesive bonding, and the strong and bulging of the polarizing substrate can be suppressed. Thus, the polarizing plate can improve the rigidity against the bulging phenomenon caused by the temperature change. The increase in the rigidity of the polarizing plate can improve the light leakage of the liquid crystal display in the dark state, and contributes to the stability of the liquid crystal display. Moreover, it is less likely to produce a sticky sheet for the automatic lamination of the subsequent liquid crystal display process. </ RTI> </ RTI> <RTIgt; </ RTI> <RTIgt; The scope of protection of the present invention is defined by the scope of the appended claims.
0659-A21315TWF(N2);M05025;CLAIRE 10 1307786 【圖式簡單說明】 第1圖係繪示偏光板之結構示意圖；以及 第2圖係繪示本發明之偏光基體薄膜與其上下保護薄 膜的貼合機構示意圖。 【主要元件符號說明】 8〜偏光板； 10〜偏光基體薄膜； 12〜上保護薄膜； 14〜下保護薄膜； 40〜偏光基體薄膜； 42〜上保護層薄膜； 44〜下保護層薄膜； 46〜第三滚輪組； 48〜第四滚輪組； 50〜第五滾輪組； 52〜第一烘箱； 54〜第二烘箱； 5 6〜黏著劑； 58〜第一滾輪組； 60〜第二滾輪組； 68〜三層偏光板。 0659-A21315TWF(N2);M05025 ;CLAIRE 110659-A21315TWF(N2); M05025; CLAIRE 10 1307786 [Simple description of the drawings] Fig. 1 is a schematic view showing the structure of a polarizing plate; and Fig. 2 is a view showing the bonding of the polarizing base film of the present invention and the upper and lower protective films thereof. Schematic diagram of the organization. [Main component symbol description] 8 to polarizing plate; 10 to polarizing substrate film; 12 to upper protective film; 14 to lower protective film; 40 to polarizing substrate film; 42 to upper protective film; 44 to lower protective film; ~ third roller set; 48 ~ fourth roller set; 50 ~ fifth roller set; 52 ~ first oven; 54 ~ second oven; 5 6 ~ adhesive; 58 ~ first roller set; 60 ~ second roller Group; 68 to three layers of polarizing plates. 0659-A21315TWF(N2); M05025; CLAIRE 11