1231384 玫、發明說明 【發明所屬之技術領域】 本發明是有關於一種偏光板的製造方法，且特別是有關 於一種偏光板的黏合方法及裝置。 【先前技術】 液晶顯示器具有高畫質、體積小、重量輕、低電壓驅動、 低消耗功率及應用範圍廣等優點。因此被廣泛應用於中、小 型可攜式电視、行動電法、攝錄放影機、筆記型電腦、桌上 型顯示器、以及投影電視等消費性電子或電腦產品，並/已逐 漸取代陰極射線管（cathode ray tube，CRT)成為顯示器的主 流。 在液晶顯示器中，偏光板為其液晶面板的主要構成元件 之一。第1A圖係繪示習知偏光板之黏合方式的流程圖，第ib 圖則繪示習知偏光板之黏合設備的示意圖，以下說明請同時 參照第1A圖與第1B圖。 偏光板係由偏光薄膜以及保護薄膜兩者黏合而組成。在 習知技術中，係將聚乙烯醇（polyvinyi alc〇h〇1，PVA)薄膜加以 染磁、拉伸及補正後製成偏光薄膜112，而保護薄膜114之材 質則使用二醋酸纖維素（triacetyl cellulose，TAC)(步驟 102)。而後，使用塗頭122將膠合劑，如聚乙烯醇膠，塗佈於 保護薄膜114與偏光薄膜112之間（步驟1〇4)，再以滾筒ι24 壓合已塗膠的保護薄膜114與偏光薄膜112(步驟1〇6)，以得 到偏光板11 6。最後’以烘箱12 6供烤此偏光板11 6，使保護 1231384 薄膜II4以及偏光薄膜112能夠緊密地 此種習知的獻八士 a + 3在起（步驟1 〇 8) 〇 由於：其烘烤時間㈣大…鐘)， 由於偏先板116係以輪送帶的 送過程中一邊利用供箱126加以=產長=過=輸 箱126的長度也必須加長（大約5 \此二間思未者烘 以；3机供允„认、&振 A尺），如此造成設備成本 備工間的浪費及原材物料的損耗增加。此外’過長的 烘烤時間會使得上述之薄膜f 、長的 合^ L專膜更合易因為受熱而產生收縮，這 會降低偏光板的品質以及生產良率。 ^如中華民國專利公告編號565716所示之「偏光膜之製 =方法、㉟光膜、光學膜及圖像顯示裝置」，如第3圖所示， 二中揭示藉由將保護膜刪之低軟化點層鳩側之薄膜層貼 〇於偏光？ 302之至少一面，並直接加熱壓接而層疊，可不 使用接著劑而製造偏光膜。此保護膜3〇4,適宜地選擇軟化點 相異之材料’並形成兩層以上之薄膜層，例如高軟化點層3〇4a 以及低軟化點層304b。 然而，此專利中所揭露的技術卻具有至少兩個以上的缺 、’第，月光源所產生的熱能會升高液晶面板的溫度，因 匕使用此I知技術所黏合之偏光板中的低軟化點材料，很容 易被高溫再度融化而破壞面板的品質，這種情況尤其容易發 生在具有高熱能光源的大尺寸液晶面板中。 其次’由於此時係融化保護膜本身來黏合偏光子以及保 凌膜’此融化的保護膜之型態偏於固體，缺乏流動性而不易 在黏合過程中滲入上述偏光子或保護膜表面的缺陷，因此無 法藉由黏合步驟修復偏光膜内部的缺陷，難以提高偏光膜的 1231384 光學性質。 【發明内容】 η因此本發明的目的就是在提供一種偏光板的黏合方法， ^變黏，的步驟順序，以提高偏光板的生產效能並減少損 耗並藉由塗佈液態的黏著劑結合預先烘烤的步驟，增加偏 光膜抗熱的月b力’改善偏光板的光學性質，並提昇其生 率。 涂3本叙明的另一目的是在提供一種偏光板的黏合裝置，在 土膠後先加以烘烤再進行加溫壓合，以縮短黏合所需的時 間，並大幅地減少黏合裝置所需的設備空間。 粑據本^明之上述目的，提出一種偏光板的黏合方法以 及其裝置。偏光板包含一偏光薄膜以及一保護薄膜。首先， 以塗佈設備將聚氨基f酸g旨膠塗佈於保護薄膜上。而後，以 ^烤。又備烘烤具有聚氨基甲酸酯（p〇lprethane，PU)膠之保護 薄膜最後，再以加熱滾筒加溫壓合烘烤後的保護薄膜與偏 光薄膜。 、/' 依照本發明—較佳實施例，偏光薄膜之材質係為聚乙烯 醇，且保護薄膜之材質係選自三醋酸纖維素、料烴共聚物 (cyclic olefln copolymer，c〇c)以及環烯烴聚合物 〇八Η。〇lefin P〇lymer，C叫）其中之一。塗佈設備係選自塗頭（die)、線棒（wir bar)以及壓花滾筒（gravure)其中之…料設備的溫度範圍$ 介於約30至55。。之間，其較佳的溫度約為45。。，以及加旁 滾筒的溫度範圍係介於約11〇至15〇。〇之間，其較佳的溫度肩 1231384 約120 C。當聚氨基甲酸酉旨膠為水性時，其溶劑為水；當聚氨 基甲酸酯膠為油性時，其溶劑係選自丙酮、曱乙酮、四氫呋 喃以及其組合其中之一。 本發明係改變習知偏光板之黏合方法的步驟順序，益配 口以χκ氨基m s旨膠為黏著劑’如此以縮短烘烤步驟所需的 時間。使用本發明來黏合的偏光板，其烘烤時間短，因此可 改善習知其薄膜品質因烘烤時間過長而降低的問題。再者， 本發明縮短偏光板的製程時間，提昇偏光板的生產效能與良 率，更同時降低黏合裝置的設備成本以及減少其所需的設備 空間。 【實施方式】 第2A圖係繪示本發明之偏光板之黏合方式的流程圖，第 2B圖則繪不本發明之偏光板之黏合設備的示意圖，以下說明 請同時參照第2A圖與第2B圖。 >偏光板包含一偏光薄膜以及一保護薄膜。首先，將聚乙 烯醇薄膜加以染碘、拉伸及補正後製成偏光薄膜丨丨2，而保護 j膜114之材質則可使用三醋酸纖維素、環烯烴共聚物以及 %烯L聚合物其中之一（步驟2〇2)。以塗佈設備222，例如習 知技術中常使用的塗頭、線棒或壓花滾筒，將聚氨基甲酸酯 勝塗佈於保護薄膜114上（步驟204)。 本發明中所使用的聚氨基曱酸酯膠可為水性聚氨基甲酸 醋膠^油性聚氨基甲酸δ旨勝，其塗佈厚度大約小A 〇 5微 米。备聚氨基甲酸酯膠為水性時，其溶劑為水；當聚氨基甲 1231384 酸醋膠為油性時，里溶岬 g白 及其組合其中之一…]係選自丙酮、甲乙酮、四氮吱喃以 溫产：Ξ二T設備226,如烘箱，以約3°…之間的 時ί佳的= ?酸自1膠之保護薄膜114(步驟施），此 長=僅;％ 3、5溫度為約4rc，供烤時間約1分鐘，且供箱的1231384 Description of the invention [Technical field to which the invention belongs] The present invention relates to a method for manufacturing a polarizing plate, and more particularly, to a method and a device for bonding a polarizing plate. [Prior technology] LCDs have the advantages of high picture quality, small size, light weight, low voltage drive, low power consumption, and wide application range. As a result, it is widely used in consumer electronics or computer products such as small and medium-sized portable TVs, mobile electronics, camcorders, notebook computers, desktop displays, and projection televisions, and has gradually replaced cathodes. A cathode ray tube (CRT) has become the mainstream of the display. In a liquid crystal display, a polarizing plate is one of the main constituent elements of a liquid crystal panel. Fig. 1A is a flowchart showing a bonding method of a conventional polarizing plate, and Fig. Ib is a schematic diagram of a bonding device of a conventional polarizing plate. For the following description, please refer to Figs. 1A and 1B. The polarizing plate is composed of a polarizing film and a protective film bonded together. In the conventional technology, a polyvinyl alcohol (polyvinyi alc0h01, PVA) film is magnetized, stretched, and corrected to produce a polarizing film 112, and the material of the protective film 114 is cellulose diacetate ( triacetyl cellulose (TAC) (step 102). Then, the coating head 122 is used to apply an adhesive such as polyvinyl alcohol glue between the protective film 114 and the polarizing film 112 (step 104), and then the coated protective film 114 and the polarizing film are laminated by a roller ι24. The film 112 (step 106) is obtained to obtain a polarizing plate 116. Finally, the polarizing plate 11 16 is baked in an oven 12 6 so that the protective 1231384 film II4 and the polarizing film 112 can closely adhere to the conventionally-provided Yasushi a + 3 (step 1 〇8) 〇Because: its baking The baking time is large ... clock), because the front plate 116 is conveyed by a rotating belt while using the supply box 126 = production length = over = the length of the input box 126 must also be lengthened (about 5 \ this two thoughts If it is not baked, 3 machines are allowed to recognize, & vibrating A-foot), which will cause the waste of equipment costs and increase the loss of raw materials. In addition, 'too long baking time will make the above film f The long special ^ L special film is more likely to shrink due to heat, which will reduce the quality of the polarizing plate and production yield. ^ "The production of polarizing film = method, calender film, as shown in the Republic of China Patent Bulletin No. 565716" "Optical film and image display device", as shown in Fig. 3, the second publication reveals that the thin film layer on the dove side of the low softening point layer of the protective film is deleted and attached to polarized light? At least one side of 302 can be laminated by heating and pressing directly, and a polarizing film can be produced without using an adhesive. This protective film 30 is suitably selected from materials having different softening points' and forms two or more thin film layers, such as a high softening point layer 304a and a low softening point layer 304b. However, the technology disclosed in this patent has at least two shortcomings. First, the thermal energy generated by the moon light source will raise the temperature of the liquid crystal panel. The softening point material is easily melted again by high temperature to damage the quality of the panel. This situation is particularly easy to occur in large-size liquid crystal panels with high thermal energy light sources. Secondly, “because the protective film itself is melted at this time to bond the polarized photons and the balun film”, the type of the molten protective film is more solid, lacking fluidity, and it is not easy to penetrate the above-mentioned polarized photons or defects on the surface of the protective film during the bonding Therefore, the defects inside the polarizing film cannot be repaired by the bonding step, and it is difficult to improve the 1231384 optical properties of the polarizing film. [Summary of the Invention] η Therefore, the purpose of the present invention is to provide a method of bonding polarizing plates, which can improve the production efficiency of polarizing plates and reduce losses. The baking step increases the thermal resistance of the polarizing film to improve the optical properties of the polarizing plate and enhances its productivity. The other purpose of Tu 3 is to provide a bonding device for polarizing plates, which is baked after soil glue and then heated and pressed to reduce the time required for bonding and greatly reduce the bonding device. Device space. According to the above purpose of the present invention, a method for bonding polarizing plates and a device thereof are proposed. The polarizing plate includes a polarizing film and a protective film. First, a protective film is coated with a polyamino acid f g glue using a coating apparatus. Then, bake with ^. Also prepare a protective film with polyurethane (PU) glue. Finally, the protective film and polarizing film after baking are heated and pressed by a heating roller. / 'According to the present invention—a preferred embodiment, the material of the polarizing film is polyvinyl alcohol, and the material of the protective film is selected from cellulose triacetate, cyclic olefln copolymer (coc), and ring. Olefin polymer. 〇lefin Polymer, C is called) one of them. The coating equipment is selected from the group consisting of a die, a wir bar and a gravure ... The temperature range of the material equipment is between about 30 to 55. . In between, its preferred temperature is about 45. . , And the temperature range of the plus drum is between about 110 and 150. 〇, its better temperature shoulder 1231384 about 120 ° C. When the polyurethane gel is water-based, the solvent is water; when the polyurethane gel is oily, the solvent is one selected from the group consisting of acetone, ethyl ethyl ketone, tetrahydrofuran, and combinations thereof. The present invention is to change the order of the steps of the conventional polarizing plate bonding method, so that the χκamino m s adhesive is used as an adhesive 'so as to shorten the time required for the baking step. The polarizing plate bonded by using the present invention has a short baking time, and therefore, it is possible to improve the problem that the quality of the film is lowered due to a long baking time. Furthermore, the present invention shortens the process time of the polarizing plate, improves the production efficiency and yield of the polarizing plate, and simultaneously reduces the equipment cost of the bonding device and the equipment space required by the same. [Embodiment] FIG. 2A is a flowchart showing the bonding method of the polarizing plate of the present invention, and FIG. 2B is a schematic diagram of the bonding device of the polarizing plate of the present invention. Please refer to FIG. 2A and 2B for the following description Illustration. > The polarizing plate includes a polarizing film and a protective film. First, the polyvinyl alcohol film is dyed with iodine, stretched, and corrected to make a polarizing film. The material of the protective j film 114 can be cellulose triacetate, cyclic olefin copolymer, and% ene L polymer. One (step 202). The coating film 222, such as a coating head, a wire rod, or an embossing roller commonly used in the conventional art, is used to coat the polyurethane film on the protective film 114 (step 204). The polyurethane glue used in the present invention may be water-based polyurethane glue ^ oily polyurethane δ, and its coating thickness is about 0.5 micrometers. When the polyurethane gum is water-based, the solvent is water; when the polyurethane 1231384 acid-vinegar gum is oily, one of Lishui white and its combination ... is selected from acetone, methyl ethyl ketone, and tetrazine Squeeze to warm production: ΞT equipment 226, such as an oven, with a time between about 3 °… good =? Acid from 1 glue protective film 114 (step application), this length = only;% 3, 5 The temperature is about 4rc, the baking time is about 1 minute, and the
〜5公尺。最後’再以加熱滾筒224以約u。至BO 壓合烘烤後的保護薄膜與偏先薄膜，此時 乂 、，皿度為約12(TC，如此即可得到偏光板i 16 〇 實施例可知’本發明將烘烤時間由習知技術的2〇 “里減少為1分鐘，且也把烘箱長度由5〇公尺縮短為3〜5公 尺因此使用本發明來黏合的偏光板，其供烤時間短，如 其：質因長時間烘烤而受損。其次，本發明縮短偏光 板的1程％間’如此不但提昇偏光板的生產效能與良率，更 同寺降低黏口凌置的设備成本以及減少其所需的設備空間。 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 範圍内，當可作各種之更動與潤飾，因此本發明之保== .當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 *為讓本發明之上述和其他目的、特徵、和優點能更明顯 易懂，下文特舉一較佳實施例，並配合所附圖式， '' 明如下： …田說 第1A圖係繪示習知偏光板之黏合方式的流程圖； 1231384 第1B圖係繪示習知偏光板之黏合設備的米意圖’ · 第2A圖係繪示本發明之偏光板之黏合方式的/爪粒圖 第2B圖係繪示本發明之偏光板之黏合設備的示意圖； 第3圖係繪示另一種習知偏光板之黏合方式的示意圖。 【元件代表符號簡單說明】 102、104、106、108 ；步驟 112 :偏光薄膜 114 :保護薄膜 116 :偏光板 122 :塗頭 124 :滾筒 126 :烘箱 202 ' 204、206、208 :步驟 2 2 2 •塗佈設備 2 2 4 ··加熱滾筒 226 :烘烤設備~ 5 meters. Finally, the heating roller 224 is set to about u. The protective film and the polarized film after the BO compression baking are laminated, at this time, the degree of drying is about 12 (TC, so that a polarizing plate i 16 can be obtained. In the example, it can be known that the present invention uses a conventional baking time. The technology's "20" is reduced to 1 minute, and the oven length is also shortened from 50 meters to 3 to 5 meters. Therefore, the polarizing plate bonded by the present invention has a short baking time, such as: Baking and damage. Secondly, the invention shortens the distance of 1% of the polarizing plate, so that it not only improves the production efficiency and yield rate of the polarizing plate, but also reduces the cost of equipment and the equipment required for sticking. Space. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and retouches without departing from the scope. Guarantee ==. It shall be subject to the definition of the scope of the attached patent application. [Simplified description of the drawings] * In order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following is a comparison The best embodiment, and with the accompanying drawings, '' Ming As follows: ... Tian said Figure 1A is a flowchart showing the bonding method of a conventional polarizing plate; 1231384 Figure 1B is a schematic view of a meter showing the bonding device of a conventional polarizing plate. 'Figure 2A is a drawing illustrating the invention Figure 2B is a schematic diagram of a polarizing plate bonding method / claw particle diagram. Figure 3B is a schematic diagram of a polarizing plate bonding apparatus of the present invention. Figure 3 is a schematic diagram of another conventional polarizing plate bonding method. Description] 102, 104, 106, 108; Step 112: Polarizing film 114: Protective film 116: Polarizing plate 122: Coating head 124: Drum 126: Oven 202 '204, 206, 208: Step 2 2 2 • Coating equipment 2 2 4 ·· Heating roller 226: Baking equipment
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