1287131 五、發明說明（1) 1 ·發明領域 本發明係有關液晶顯示器（LCD)的導光板（light guide or photo conductive plate)，特別是關於較大尺 寸液晶顯示器使用的導光板之製造方法。 2·發明背景 ，LCD的背光裝置（backlight device)分為直射式及側 光式（edge or side 1 ight)兩種，分別如第一圖及第二圖 所示。在第一圖中，（a)圖為（b)圖的剖視圖，直射式的背 光裝置包括一排列的光源1 〇，反射板丨2及擴散板丨4分別設 於光源1 0的前後二面。第二圖的側光式背光裝置包括光源 2 0位於導光板2 2侧邊，光源2 〇周圍圍繞光線反射器2 4，導 光板22的前後二面亦分別設有擴散板26及反射板28，（a) 圖為（b )圖的剖視圖。而側光式背光裝置考慮不同亮度、 重量及光源消耗電力等因素又可區分為單邊、雙邊及三邊 入光等三種方式。第二圖所示裝置即為單邊式，第三圖的 (a)圖及（b)圖則分別在導光板32及36側邊配置雙邊光源30 及三邊光源34。 在側光式背光裝置中，導光板為使用壓克力（PMMA)材 質製成的平板，其作用係在使光源從侧邊導入，再經光散 射轉變成均勻的面光源。導光板一般係利用壓克力粒射出 成型（injection)或使用平板壓克力。 為促使導光板獲得均勻的輝度，通常皆在導光板的表 面印刷不同於壓克力板折射率（refractive index)的材 料，或直接在導光板表面形成不同角度的折射面。第四圖1287131 V. INSTRUCTION DESCRIPTION (1) 1 FIELD OF THE INVENTION The present invention relates to a light guide or photo conductive plate for a liquid crystal display (LCD), and more particularly to a method of manufacturing a light guide plate for use in a relatively large-sized liquid crystal display. 2. Background of the Invention The backlight device of an LCD is divided into two types: direct type and side light type (edge or side 1 ight), as shown in the first figure and the second figure, respectively. In the first figure, (a) is a cross-sectional view of (b), the direct-type backlight device includes an array of light sources 1 〇, and the reflection plate 丨 2 and the diffusion plate 丨 4 are respectively disposed on the front and rear sides of the light source 10 . The edge-lit backlight device of the second embodiment includes a light source 20 located on the side of the light guide plate 2 2 , and a light source 2 around the light reflector 2 4 . The front and rear surfaces of the light guide plate 22 are also respectively provided with a diffusion plate 26 and a reflection plate 28 . (a) The figure is a cross-sectional view of (b). The edge-lit backlight device can be divided into three methods: single-sided, bilateral, and three-sided light, considering factors such as different brightness, weight, and power consumption of the light source. The device shown in the second figure is a single-sided type, and the (a) and (b) drawings of the third figure are provided with a bilateral light source 30 and a three-sided light source 34 on the sides of the light guide plates 32 and 36, respectively. In the edge-lit backlight device, the light guide plate is a flat plate made of acrylic (PMMA) material, and its function is to introduce the light source from the side and then convert it into a uniform surface light source by light scattering. The light guide plate is generally injection molded using acrylic particles or using flat plate acrylic. In order to obtain a uniform brightness of the light guide plate, a material different from the refractive index of the acrylic plate is usually printed on the surface of the light guide plate, or a refractive surface of a different angle is formed directly on the surface of the light guide plate. Fourth picture
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第/、圖顯示三種常見的實施例，其中（a)圖皆為（b)圖的 $，圖。第四圖所示裝置係在導光板22的一面上形成含有 二散射粒子的透明樹脂油墨層38。第五圖所示裝置係在導 ^板22的—面上製造粗糙塊4〇，使其形成凹凸面。第六圖 ^不裝置係在導光板22的一面上挖射凹痕42，使其形成鋸 、 然而，對 (i nch)以上者 重。改變導光 出成型技術製 制，難以實現 導光板仍採用 3·發明目的與 本發明之 新製程。 本發明之 wedge)的液晶 本發明之 顯示器導光板 本發明之 導光板的製造 本發明之 化導光板的方 根據本發 於較大尺寸的液晶顯示器，例如1 2英时 ，使用平板壓克力作為導光板便顯得過於笨 板的形狀可以解決這項難題。不過，使用射 造導光板，其尺寸及厚度差受到很大的限 目的。因此’目前量產的大尺寸液晶顯示器 平板壓克力。 概述 主要目的即為揭露一種液晶顯示器導光板的 次:目的係在提出一種雙楔形（d〇ubu 顯=器導光板及製造此導光板的模具。 另一目的係在提出一種易於製造大尺寸液晶 的方法。 =二目的係為提出一種適合量產液晶顯示器 方法。 2目的係為提出一種生產具有較大厚度變 主要係利用鑄入聚合法（casting)製造The figure / diagram shows three common embodiments, in which (a) the diagram is the $, diagram of (b) diagram. The apparatus shown in the fourth figure forms a transparent resin ink layer 38 containing two scattering particles on one surface of the light guide plate 22. In the apparatus shown in Fig. 5, a rough block 4 is formed on the surface of the guide plate 22 to form an uneven surface. Fig. 6: No device is used to dent the indentation 42 on one side of the light guide plate 22 to form a saw, however, it is heavy for (i nch) or more. It is difficult to realize the light guide plate by changing the light guide forming technology, and the new process of the present invention. Liquid crystal of the present invention, light guide plate of the present invention, and light guide plate of the present invention. The light guide plate of the present invention is made of a liquid crystal display of a larger size, for example, 1 2 inches, using a flat plate acrylic force. The shape that is too clumsy as a light guide plate can solve this problem. However, the use of a light-guide plate is greatly limited in size and thickness. Therefore, the current large-volume LCD display flat-plate acrylic. The main purpose of the summary is to disclose a liquid crystal display light guide plate: the purpose is to propose a double wedge shape (d〇ubu display light guide plate and a mold for manufacturing the light guide plate. Another object is to provide an easy to manufacture large size liquid crystal. The method of the second purpose is to propose a method suitable for mass production of liquid crystal displays. 2 The purpose is to propose a production with a large thickness change mainly by casting polymerization.
第5頁 五、發明說明（3) f晶顯示器的=光板’其步驟包括準備鑄入聚合製程之雙 私+ 、.人〜r基丙烯酸甲酯（MMA)與聚合開 始劑drntiator)，令上述調合物預備聚合 (prepolymerization)；蔣 u 、+、雄处甘 广飞 、^ )财上述預備聚合後的調合物漿化 (slurry);將上述漿化後的蜩人 ^ ^ ,说幻調合物鑄入上述模具内；利用 f處理（heat treatment)使模具内的 明：ΠΓ楔形之透明壓克力樹醋導 、、典的表面田而僅^點，係在模具的雙楔形下板形成非光 /月的表面，因而獲侍具有較佳光散射效果的導光板。在不 同的實施例中，導光板的雙# # # is姑描，， 雙楔形表面可以形成凹凸面或鋸 齒面，使導光板將來能夠產生均勻的表面輝度。 製造導光板的模具較佳者係使用玻璃 玻璃經壓模產生。 J 財以被 入聚合法製造液晶顯示器的導光板，能 :又闵：、奋乂大厚度變化的導光板，大幅減輕導光板的重 篁，因此適於用來量產大尺寸的液晶顯示器的導光板。 路明ΐΐί下的實施例配合所附的圖示，當更容易明瞭本 發明之内容及特點。 4圖號說明 10光源 12反射板 14擴散板 20光源 22導光板 24光線反射器 26擴散板 28導光板 30光源 32導光板 1287131Page 5 5, invention description (3) f crystal display = light board 'the steps include preparation of the poly-polymer +, human-r-methyl acrylate (MMA) and polymerization starter drntiator) Prepolymerization of the mixture; Jiang u, +, Xiongjia Ganguangfei, ^), the above-mentioned preparation of the slurry after the preparation of the slurry (slurry); the above-mentioned slurry of the scorpion ^ ^, said the magic blend into In the above mold; using f treatment (heat treatment) to make the inside of the mold: the wedge-shaped transparent acrylic tree vinegar guide, the surface of the surface and only the point, in the double wedge-shaped lower plate of the mold to form non-light / The surface of the moon is thus served with a light guide plate having a better light scattering effect. In a different embodiment, the double-wedge surface of the light guide plate can form a concave or convex surface or a sawtooth surface, so that the light guide plate can produce a uniform surface brightness in the future. The mold for manufacturing the light guide plate is preferably produced by compression molding using glass glass. J is a light-guide plate that is manufactured by a polymerization method to produce a liquid crystal display. It can also be used to produce a large-sized liquid crystal display by greatly reducing the weight of the light guide plate. Light guide plate. The embodiments of the invention will be more readily apparent from the following description of the invention. 4 Figure No. Description 10 Light source 12 Reflector 14 Diffuser 20 Light source 22 Light guide 24 Light reflector 26 Diffuser 28 Light guide 30 Light source 32 Light guide 1287131
34光源 透明樹脂油墨 42凹痕 46光源 50上模 5 4粗糖塊34 light source transparent resin ink 42 dent 46 light source 50 upper mold 5 4 coarse sugar block
6〇鑄入聚合製造 62準備模具 66甲基丙稀酸甲 70預備聚合 74漿化 78聚合 82脫模 詳細說明 36導光板 ^ 4 0粗輪塊 44導光板 48光線反射器 52下模 5 6 粗糙塊 導光板的製程 64調合 m 68聚合開始劑 7 2熱處理 76注模 8 〇熱處理 84導光板 根據本發明，电| -C. I nr» 的導光板，J驟入聚合法製造液晶顯示器 調合甲基丙烯酸甲醋與聚合J程之雙楔形模具； 合；將上述預備聚合後的；二‘將’ 7上述调合物預備聚 士 、、 復的凋合物漿化；將上述漿化後的調 合物_ ϋ述模具内；㈤用熱處理使模具内的調合物進行 聚合；最後再脫模，便可得到雙楔形之透明壓克力樹酯導 光板° 第七圖顯示一導光板的較佳實施例，（a)圖為（b)圖的 剖視圖。導光板44為雙楔形，即一表面為单，另〆表面 為内凹的雙楔形表㈣光板44兩=::有光源46,6〇casting into polymerization manufacturing 62 preparation mold 66 methyl acrylate acid 70 pre-polymerization 74 pulping 78 polymerization 82 demoulding detailed description 36 light guide plate ^ 4 0 coarse wheel block 44 light guide plate 48 light reflector 52 lower mold 5 6 Rough block light guide plate process 64 blending m 68 polymerization starter 7 2 heat treatment 76 injection mold 8 〇 heat treatment 84 light guide plate according to the present invention, electric | - C. I nr» light guide plate, J splicing polymerization method for manufacturing liquid crystal display a double wedge mold of methacrylic acid methyl vinegar and a polymerization J; a combination; the above pre-polymerized; the second 'will be prepared as a slurry of the above-mentioned blend, and the complex isalized; (5) heat treatment to polymerize the blend in the mold; finally demoulding to obtain a double wedge-shaped transparent acrylic resin light guide plate. The seventh figure shows a preferred implementation of a light guide plate. For example, (a) is a cross-sectional view of (b). The light guide plate 44 has a double wedge shape, that is, a single wedge surface having a surface and a concave surface on the other surface. (4) The light plate 44 is two:: There is a light source 46,
1287131 五、發明說明（5) 並以光線反射器48包圍光源46。雙椒犯μ、* 輕重量。以"英叶的歷克力導光板；可以減 厚度差可達3公复㈣以上，重量較為^導其古邊乂與中央的 以上。 权十板導光板減輕約20% 第八圖係製造第七圖所示導光板的模具，盆 =及-下模52。上模50係平板玻璃，下模52則為2“ 玻璃。此一模具可以利用熔融的玻璃以壓模方式產=。、 為增進導光板表面輝度的均勻效果，可以使 ==形ί非光滑表面，第九圖提出-種具有粗糖塊 可以製造第十圖所示的導光板44。導 ^板44上的粗糙塊56以中央處具有較大區域向兩旁延 Ξ逐雙=晶顯示器導光板技藝之人士應當瞭 化，形狀或構造變 力板折射率的材料於雙楔形表面。 不U於壓克 製k第七圖或第十圖所示導光板的過程如第十一圖所 ::在使用鎊入聚合製造導光板的製程60中，= 。fϊ i62，例如使用第八圖或第九圖所示的模且。 _及聚合開二Γ6: ’使用預先備妥的甲基丙婦酸甲 先讓調合的單量ΞΙ。先將調合物進行預備聚合70，這是 可以施加熱處理 n〇mer)發生初步的聚合，此一步驟 具中7:將：Ji:::調合物漿化74 ’注入先前準備的模 ^ 的調合物完全聚合78，此一步驟須施予 12871311287131 V. Description of the invention (5) and surrounding the light source 46 with a light reflector 48. Double peppers make μ, * light weight. With " English leaf, the light guide plate; can reduce the thickness difference up to 3 gongs (four) or more, and the weight is more than the center of the 乂 and the central. The weight of the light guide plate is reduced by about 20%. The eighth figure is the mold for manufacturing the light guide plate shown in the seventh figure, the basin = and - the lower mold 52. The upper mold 50 is a flat glass, and the lower mold 52 is a 2" glass. This mold can be produced by compression molding using molten glass. To improve the uniformity of the surface brightness of the light guide plate, it is possible to make the == shape ί non-smooth Surface, the ninth figure proposes that the light guide plate 44 can be manufactured with the coarse sugar block. The roughness block 56 on the guide plate 44 has a large area at the center and is extended to both sides by two sides = crystal display light guide plate The person skilled in the art should have the shape, or the material of the refractive index of the variable force plate on the double wedge surface. The process of the light guide plate shown in the seventh or tenth figure of the k is not as shown in the eleventh figure: In the process 60 for manufacturing a light guide plate using a pound-in-polymerization, =.fϊ i62, for example, using the mold shown in the eighth or ninth figure. _ and the polymerization opening 6: 'using a pre-prepared methyl propyl group The acid is firstly blended with a single amount of hydrazine. The blend is first subjected to preliminary polymerization 70, which can be applied by heat treatment. The initial polymerization occurs. This step has 7: Will: Ji::: the slurry is slurried. 74 'Injection of the previously prepared mold ^ composition completely polymerized 78, this step must be applied 1287131
熱處理80以增進聚合的速度及效果。經過聚合78步騾，甲 基丙烯酸甲酯會完全聚合並依照模具成型。最後再經脫模 8 2，便得到雙楔形之透明壓克力樹酯導光板8 4。 由於利用鑄入聚合法，即使大尺寸的導光板也很容易 達成，並且其厚度差可以相當大，以減輕整個導光板的重 量，而這製程適合量產，對於產業具有極大價值。 以上所述係藉由實施例說明本發明之特點，其目的在 使熟習該技術者月b瞭解本發明之内容並據以實施，而非限 定本發明之專利範圍。對於熟習相關技藝之人士而言，报 輕易地能夠修改上述實施例，而不脫離本發明揭示之精 神。故，本發明應根據以下所述之申請專利範圍而決定。 1287131 圖式簡單說明 圖式說明 第一圖及第二圖分別為習知直射式及側光式之LCD的 背光裝置。 第二圖係雙邊式及三邊式光源的習知侧光式LCD的背 光裝置。 第四圖至第六圖顯示三種具有較佳光散射效果的導光 板0 第七圖係本發明所提出之雙楔形導光板。 第八圖係製造第七圖所示導光板的模板。 第九圖係本發明所提出之另一下模板，用來製造呈 光散射效果的雙楔形導光板。 第十圖係利用第九圖所示模板製造出的雙換形 板。 、》導光 第十一圖顯示本發明製造導光板的過程。Heat treatment 80 to increase the speed and effectiveness of the polymerization. After 78 steps of polymerization, methyl methacrylate is completely polymerized and molded according to the mold. Finally, after demolding 8 2, a double wedge-shaped transparent acrylic resin light guide plate 8 4 is obtained. Since the cast polymerization method is used, even a large-sized light guide plate can be easily obtained, and the difference in thickness can be made relatively large to reduce the weight of the entire light guide plate, which is suitable for mass production and is of great value to the industry. The above description of the present invention is made by way of example, and the purpose of the invention is to be understood by those skilled in the art. It will be readily apparent to those skilled in the art that the above-described embodiments can be modified without departing from the spirit of the invention. Therefore, the invention should be determined in accordance with the scope of the claims described below. 1287131 Brief Description of the Drawings The first and second figures are backlights of conventional direct-lit and edge-lit LCDs, respectively. The second figure is a backlight device for a conventional side-lit LCD of a bilateral and three-sided light source. The fourth to sixth figures show three light guide plates having a better light scattering effect. The seventh figure is a double wedge type light guide plate proposed by the present invention. The eighth figure is a template for manufacturing the light guide plate shown in the seventh figure. The ninth drawing is another template proposed by the present invention for producing a double wedge-shaped light guide plate having a light scattering effect. The tenth figure is a double-changing plate manufactured using the template shown in the ninth figure. , "Light Guide" The eleventh figure shows the process of manufacturing the light guide plate of the present invention.