1287670 九、發明說明： 【發明所屬之技術領域】 本發明係有關於一種雙料射出製造膠框以及導光板之方法，且特別 是-種以雙料射出製造-用於液晶顯示器之背光模組之膠框以及導光 板之方法。 【先前技術】 背光模組(Back light module)為液晶顯示器面板(Liquid crystal display panel，LCD panel)的關鍵零組件之一，由於液晶本身不發光，背 光模組之功能即在於供應充足的亮度與分佈均勻的光源，透過簡潔有 效光機構轉化成高亮度且均一輝度的面光源，以提供液晶顯示器面板 背光光源。液晶顯示器面板現已廣泛應用於監視器、筆記型電腦、數 位相機及投影機等具成長潛力之電子產品，尤以筆記型電腦&LCD監 視器等大尺寸用面板需求最大，也因此對於背光模組需求成長也曰趨 強烈。 背光模組其主要由發光源(例如冷陰極螢光管、熱陰極螢光管、發 光二極體）、反射板(Reflector)、導光板(Light guide plate)、擴散片 (Diffusion sheet)、稜鏡片（Brightness Enhancement Film)及外框等組件組 裝而成。發光源射出的光線進入導光板後，會導引射入的光源將其分 佈成均勻的面光源，位於導光板一側之反射板會將射向反射板方向的 光反射回導光板中，防止光源外漏，以增加光的使用效率。由導光板 1287670 射出的光線再經擴散片的均光作用與稜鏡片的集光作用，提高光源的 儿度與均勻度後’再將先線射人液晶面㈣。外酬制來包覆上述 零件，提供所需之剛性，並可以保護免受外在環境之污染，其中外框 可以為雜或是金屬框。—般為了某些設計上之需求，或是節省製造 成本，會將導光板以及膠框一同以塑膠射出成型的方式一體成型之。 一般塑膠射出成型分為兩種，一種稱之為單料射出成型，另一種 稱之為雙料射出成型。單料射出成型製程即由單一料管經由喷嘴將單 -塑料注人—成麵穴中以形成所要的物件。由於其製雜徵擁有製 品成型容易、可大量生產、降低生產成本而且可適合複雜成品成型等 優點’已廣泛應用於日常生活用品、家電用品和汽車零組件，成為現 今塑膠加工業廣泛應用之成型技術。但由於基於成型品品質精密度的 要求、環保考量、技術的改良以及二次加工的節省，於是因應產生雙 料射出成型製程(C〇_Injecti〇n Molding)。雙料射出成型製程其操作原理 疋在傳統射出機多加一根料管和改良式喷嘴，兩個料管内分別注入二 種相同或相異但具相容性高分子之熔膠。在熔膠射出過程可以同時或 以間隔式順序將熔膠射入成型模穴中。易言之，雙料射出成型製程即 先於半成品模型射出成型A塑膠材質，移送到成品模型後，再射出成型 B塑膠材質於其上，形成最後成型品。 對背光模組製造商而言，降低成本的方法不外乎是將各零件模組 構造簡化’採所謂一體化導光板的設計。請參閱第1圖，第1圖係相關 1287670 技射錢料射A製造背光模組之雜以及導光板之_。先行將膠 框12所需之塑料a由二塑料進膠點16射入成型模穴一定量，再將導光板 14所需之B塑料由塑料進膠點18配合二塑料進膠點16以同時或間射順 序控制方式射出，使得A塑料以及3塑料熱融接合在一起，如此開模之 後，形成導光板14與膠框12結合一體的成品。比起傳統單料射出成型， 利用雙料射出成型的製程，在相對而言較短的時間内，使用低能源成 本大量製造結合為一體的導光板14以及膠框12。 § 由於在液晶顯示器的組裝過程中，光源一般都是等到一體化的導 光板以及膠框完成後再加以安裝，所以在製造一體化的導光板以及膠 _時候賴先前HJ定位置以作為接下來絲安裝之用。然而雙料 射出製程會因為B塑料流經預設給光源使用的孔洞20時經分割產生兩 股塑流(其塑流方向如箭頭22a、22b所示)後，再結合熱空氣阻擋而產 生接合線(WddLine)25。接合線25會嚴重影響導光板14的光學品質。 • 為了解決接合線25產生的問題，目前多採用提昇塑料溫度或將塑料經 孔✓同之速度&南’或是提尚模具溫度或使用流動性較佳等級之材料， 抑或是增加射速及射壓，或是檢查原料的水分含量等方式。然而在射 出成型過程中，因為接合線25是一個複雜的三維熔接區域，以及導光 板本身之大小以及厚度關係，因此上述方式都無可避免會產生接合 線。所以如何完全避免接合線的產生，是一個急待解決的問題。 【發明内容】 1287670 因此，本發明之目的係提供一種以雙料射出製造一用於液晶顯示 器之背光模組之膠框以及導光板之方法，可避免接合線的產生，以解 決上述習知技術之問題。 本發明係提供一種以雙料射出製造一背光模組之膠框以及導光板 之方法，其包含下列步驟： 決定一背光模組之光源之預設數量； 依據該光源之預設數量決定由一第一導光板塑料進膠點或一第二導光 板塑料進膠點射出一第二塑料以形成一導光板，該第一導光板塑料 進膠點係近鄰於該光源之預設位置，該第二導光板塑料進膠點係遠 離該光源之預設位置，·以及 雙料射出一體成型之膠框與導光板。 本發明另提供一種具導光板之膠框一體成型之製造方法，其係可 配合複數個光源使用，包含： 決定該複數個光源之數目； 依據該複數個光源數目之數目，決定一導光板塑料進膠點之位置；以 及 進行一雙料射出製程，以進行一導光板以及一膠框之射出成型。 本發明之優點即在於決定背光模組所需要的光源之數量後，即可適 當地決定射出導光板塑料進膠點，尤其是當光源之預設數量為奇數 時，透過導光板塑料進膠點的調整將可以避免導光板在射出成型的過 9 1287670 程中產生接合線的問題。 【實施方式】 请參閱第2圖，第2圖係本發明之方法流程圖。其步驟如下： 步驟100 :決定一背光模組之光源之預設數量。 步驟102 :提供-第一導光板塑料進膠點以及一第二導光板塑料進膠 點，該第一導光板塑料進膠點係近鄰於該光源之預設位 置，该第二導光板塑料進膠點係遠離該光源之預設位置。 步驟104 :射入一第一塑料以形成一膠框。 步驟106 ··判斷光源之預設數量是否為奇數，若是，執行步驟ι〇8，若 否，執行步驟110。 步驟108:當光源之預設數量係為單數時，由該第二導光板塑料進膠 點射出第二塑料以形成該導光板。 步驟110 ··當該光源之職數量係為偶數時，由該第_導光板塑料進 膠點或該第二導光板塑料進膠點射出該第二塑料以形成該 導光板。 步驟112 ··取出一體成型之膠框與導光板。 請-併參閲第2圖、第3圖、第4圖以及第5圖。第3圖係本發 明之背光模組之預設光源為奇數時，導光板進膠點與預設光源位置之 示意圖。第4圖和第5 ®係本發明之背光模組之預設光源為偶數時， 導光板進膠點與預設光源位置之示意圖。在雙料射出之前，先满製 1287670 造膠框以及導光板的模具内保留給預設光源的孔洞34個數(步驟 100)。以第3圖為例，預設光源孔洞34為3個，第4圖的預設光源孔 洞34有4個。接下來由進膠點62射入塑料c以形成膠框3〇(步驟1〇2)。 在本實施例中，提供兩個不同導光板塑料進膠點，如第4圖以及第3 圖所示，第一導光板塑料進膠點80係位於預設光源孔洞34之相同侧， 也就疋近鄰於預設光源孔洞34的一側，而第二導光板塑料進膠點6〇 係位於預設光源孔洞34之相反侧，也就是遠離預設光源孔洞34的一 • 側。當然導光板塑料進膠點60、80的設置還需考量對稱的問題，一般 導光板塑料進膠點60、80都是設置在預設光源孔洞34所安排位置的 中垂線上。接下來依據預設光源孔洞的個數決定要由哪一個導光板塑 料進膠點60、80射出導光板32所要的塑料D(常用的是pc或是 PMMA)。如第3圖所示，當預設光源孔洞34個數為奇數時，就由位 於預設光源孔洞34之相反側之第二導光板塑料進膠點6〇射入塑料D。 由於在塑料D射入的過程中，塑料D的塑流並沒有被預設光源孔洞34 籲 所阻擋，所以能呈現均勻分佈的狀態而沒有習知技術中接合線的產 生。如第4圖所示，當預設光源孔洞34個數為偶數時，就由位於預設 光源孔洞34之相同側之第一導光板塑料進膠點80射入塑料D。因為 第一導光板塑料進膠點80所設置的相對位置並不會有預設光源孔洞34 的阻擋’而且預設光源孔洞34的分佈也很均勻，所以塑料d射入之後， 並不會有分佈不均的現象發生，所以也沒有產生接合線的困擾。當然， 當預設光源孔洞34個數為偶數時，也可以由位於預設光源孔洞料之 11 -1287670 相反側之第一導光板塑料進膠點60射入塑料D，如第5圖所示。這也 不會有產生接合線的困擾。 最後當膠框30以及導光板32 —體成型後，即可開模取得有光學 圖案設計的導光板(在導光板上方或下方有圖案化之凹凸表面，用以導 光）。或是再用高反射率且不吸光的顏料如Ti〇2，在導光板3〇底面以 網版印刷印上圓形或方形的擴散點，即可完成製作。 肇請參閱第6圖，第6圖係本發明之另一實施例之方法流程圖。 步驟200 :決定一背光模組之光源之預設數量。 步驟202:提供一第一導光板塑料進膠點以及一第二導光板塑料進膠 點，該第一導光板塑料進膠點係近鄰於該光源之預設位 置，該第二導光板塑料進膠點係遠離該光源之預設位置。 步驟204 :判斷光源之預設數量是否為奇數，若是，執行步驟2〇6，若 否，執行步驟208。 • 步驟206 :當光源之預設數量係為單數時，由該第二導光板塑料進膠 點射出第二塑料以形成該導光板。 步驟208:當該光源之預設數量係為偶數時，由該第一導光板塑料進 膠點或該第二導光板塑料進膠點射出該第二塑料以形成該 導光板。 步驟210 :射入一第一塑料以形成一膠框。 步驟212 :取出一體成型之膠框與導光板。 12 1287670 不同於第3圖的方法流程圖，在第6圖所示之實施例中，雙料射 出的過程中，導光板的射出成型(步驟206或是步驟208)亦可先於塑料 的射出成型(步驟210)。 上述一體化之導光板與膠框之製造方法，係可應用於各種液晶顯 示器。 相較於習知技術，本發明提供兩個不同的導光板塑料進膠點，一 • 個導光板塑料進膠點位於預設光源所在位置的相同側，另一個導光板 塑料進膠點位於預設光源所在位置的相反侧。自本發明之製程中，一 但預設光源之個數為奇數時，則由位於預設光源所在位置相反側的導 光板塑料進膠點射入塑料，如此一來，在不用額外調整塑料溫度、塑 料>瓜速或射壓’或是提兩模具溫度或使用流動性較佳等級之材料的方 式下，就可以避免習知射出成型導光板的過程中產生接合線的問題。 ^ 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， 任何熟悉此項技藝者，在不脫離本發明之精神和範圍内，當可做些許 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。 【圖式簡單說明】 第1圖係習知技術中以雙料射出製造背光模組之膠框以及導光板之示 意圖。 13 -1287670 第2圖係本發明之方法流程圖。 第3圖係本發明之背光模組之預設光源為奇數時，導光板進膠點與預 設光源位置之示意圖。 第4圖以及第5圖係本發明之背光模組之預設光源為偶數時，導光板 進膠點與預設光源位置之示意圖。 第6圖係本發明之另一實施例之方法流程圖。 【主要元件符號說明】 12 膠框 16 進膠點 20、34光源孔洞 25 接合線 32 導光板 80 進膠點 14 導光板 18 進膠點 22a、22b 塑流 30 膠框 60、62 進膠點 141287670 IX. Description of the Invention: [Technical Field] The present invention relates to a method for manufacturing a plastic frame and a light guide plate by double-material injection, and in particular, a double-shot injection manufacturing--the glue for a backlight module of a liquid crystal display The method of the frame and the light guide plate. [Background] The backlight module is one of the key components of the liquid crystal display panel (LCD panel). Since the liquid crystal itself does not emit light, the function of the backlight module is to supply sufficient brightness and The light source with uniform distribution is converted into a high-brightness and uniform luminance surface light source through a simple and effective optical mechanism to provide a backlight source of the liquid crystal display panel. LCD panels are now widely used in monitors, notebook computers, digital cameras and projectors with potential for growth, especially for large-size panels such as notebook computers and LCD monitors. Module demand growth is also growing strongly. The backlight module is mainly composed of a light source (for example, a cold cathode fluorescent tube, a hot cathode fluorescent tube, a light emitting diode), a reflector, a light guide plate, a diffusion sheet, and a prism. The lens (Brightness Enhancement Film) and the outer frame are assembled. After the light emitted by the light source enters the light guide plate, the incident light source is guided to distribute it into a uniform surface light source, and the reflector on the side of the light guide plate reflects the light directed toward the reflector back into the light guide plate to prevent the light from being reflected back to the light guide plate. The light source leaks to increase the efficiency of light use. The light emitted by the light guide plate 1287670 passes through the homogenizing action of the diffuser and the light collecting action of the cymbal to improve the child's degree and uniformity, and then the first line is incident on the liquid crystal surface (4). The external compensation system covers the above parts to provide the required rigidity and protects against the external environment. The outer frame can be made of metal or metal frame. In general, for some design requirements, or to save manufacturing costs, the light guide plate and the plastic frame are integrally molded by plastic injection molding. Generally, plastic injection molding is divided into two types, one is called single-shot injection molding, and the other is called double-shot injection molding. The single shot molding process involves injecting a single-plastic into a cavity from a single tube via a nozzle to form the desired object. Because of its easy to mold, high-volume production, low production cost and suitable for complex finished products, it has been widely used in daily necessities, home appliances and automotive components, and has become widely used in the plastic processing industry. technology. However, due to the demand for precision of molded products, environmental considerations, improvement of technology, and savings in secondary processing, a two-shot injection molding process (C〇_Injecti〇n Molding) was created. The operation principle of the two-shot injection molding process 疋In the traditional injection machine, a new material tube and an improved nozzle are added, and two kinds of the same or different melt polymers with compatible polymers are injected into the two material tubes. The melt can be injected into the forming cavity simultaneously or in a spaced sequence during the melt injection process. In other words, the two-shot injection molding process is to shoot the molded plastic material before the semi-finished model, and then transfer it to the finished model, and then shoot the molded B plastic material onto it to form the final molded product. For backlight module manufacturers, the way to reduce costs is nothing more than simplifying the construction of each part module. Please refer to Figure 1, the first picture is related to the 1287670 technology shot material A manufacturing backlight module and the light guide plate. First, the plastic a required for the plastic frame 12 is injected into the molding cavity by a plurality of plastic feeding points 16 , and then the B plastic required for the light guiding plate 14 is matched with the plastic feeding point 18 by the plastic feeding point 18 to simultaneously Or the injection sequence control method is sprayed, so that the A plastic and the 3 plastic are hot-melt bonded together, and after the mold is opened, the finished product in which the light guide plate 14 and the plastic frame 12 are integrated is formed. The light guide plate 14 and the bezel 12 are integrally manufactured in a relatively short period of time using a low-energy cost in a relatively short period of time compared to the conventional single-shot injection molding process. § Because during the assembly process of the liquid crystal display, the light source is generally installed after the integrated light guide plate and the plastic frame are completed, so in the manufacture of the integrated light guide plate and the glue _, the previous HJ position is used as the next Wire installation. However, the two-shot injection process generates a bonding wire by splitting the hot air barrier by splitting the B plastic into two holes 20 (22a, 22b). (WddLine) 25. The bonding wires 25 can seriously affect the optical quality of the light guide plate 14. • In order to solve the problems caused by the bonding wire 25, it is currently used to increase the plastic temperature or to pass the plastic through the hole ✓ the same speed & south or to raise the mold temperature or use a better level of fluidity, or increase the rate of fire And the injection pressure, or check the moisture content of the raw materials. However, in the injection molding process, since the bonding wire 25 is a complicated three-dimensional welding region, and the size and thickness relationship of the light guiding plate itself, it is inevitable that the bonding wire is generated in the above manner. Therefore, how to completely avoid the generation of the bonding wire is an urgent problem to be solved. SUMMARY OF THE INVENTION Accordingly, the object of the present invention is to provide a method for manufacturing a plastic frame and a light guide plate for a backlight module of a liquid crystal display by double-shot injection, which can avoid the generation of bonding wires to solve the above-mentioned prior art. problem. The invention provides a method for manufacturing a plastic frame and a light guide plate of a backlight module by using two materials, which comprises the following steps: determining a preset number of light sources of a backlight module; determining a number according to a preset number of the light sources a light guide plate plastic glue point or a second light guide plate plastic glue point emits a second plastic to form a light guide plate, the first light guide plate plastic glue point is adjacent to the preset position of the light source, the second The plastic film entrance point of the light guide plate is away from the preset position of the light source, and the plastic frame and the light guide plate which are integrally formed by the double material injection. The invention further provides a manufacturing method for integrally forming a plastic frame with a light guide plate, which can be used with a plurality of light sources, comprising: determining the number of the plurality of light sources; determining a light guide plate plastic according to the number of the plurality of light sources Positioning the glue point; and performing a two-shot injection process to perform injection molding of a light guide plate and a plastic frame. The invention has the advantages that after determining the number of light sources required for the backlight module, the plastic feeding point of the light guide plate can be appropriately determined, especially when the preset number of the light source is an odd number, the plastic feeding point is transmitted through the light guide plate. The adjustment will avoid the problem that the light guide plate will produce a bonding wire in the process of injection molding. [Embodiment] Please refer to Fig. 2, which is a flow chart of the method of the present invention. The steps are as follows: Step 100: Determine a preset number of light sources of a backlight module. Step 102: providing a first light guide plastic feeding point and a second light guiding plate plastic feeding point, the first light guiding plate plastic feeding point is adjacent to the preset position of the light source, and the second light guiding plate is plastically advanced. The glue point is away from the preset position of the light source. Step 104: Injecting a first plastic to form a plastic frame. Step 106 · Determine whether the preset number of the light source is an odd number. If yes, execute step ι〇8. If no, go to step 110. Step 108: When the preset number of the light sources is a single number, the second plastic is injected from the plastic entrance point of the second light guide plate to form the light guide plate. Step 110: When the number of the light source is an even number, the second plastic is injected from the plastic inlet point of the first light guide plate or the plastic feed point of the second light guide plate to form the light guide plate. Step 112 · Take out the integrally formed plastic frame and the light guide plate. Please - and refer to Figure 2, Figure 3, Figure 4 and Figure 5. Fig. 3 is a schematic view showing the position of the light guide plate and the preset light source when the preset light source of the backlight module of the present invention is an odd number. FIG. 4 and FIG. 5 are schematic diagrams showing the position of the light guide plate and the preset light source when the preset light source of the backlight module of the present invention is an even number. Before the two materials are ejected, the number of holes 34 reserved for the preset light source in the mold of the 1287670 plastic frame and the light guide plate is completed (step 100). Taking Fig. 3 as an example, there are three preset light source holes 34, and four preset light source holes 34 in Fig. 4. Next, the plastic c is injected from the glue feed point 62 to form a plastic frame 3 (step 1〇2). In this embodiment, two different light guide plate plastic feeding points are provided. As shown in FIG. 4 and FIG. 3, the first light guide plate plastic feeding point 80 is located on the same side of the preset light source hole 34, that is, The 导 is adjacent to one side of the preset light source hole 34, and the second light guide plastic feed point 6 is located on the opposite side of the preset light source hole 34, that is, away from the side of the preset light source hole 34. Of course, the setting of the plastic feeding points 60 and 80 of the light guide plate also needs to consider the symmetry problem. Generally, the plastic feeding points 60 and 80 of the light guiding plate are disposed on the vertical line of the position where the preset light source hole 34 is arranged. Next, according to the number of preset light source holes, which one of the light guide plate plastic feed points 60, 80 is required to inject the plastic D (usually pc or PMMA) of the light guide plate 32. As shown in Fig. 3, when the number of preset light source holes 34 is an odd number, the second light guide plastic feed point 6 on the opposite side of the preset light source hole 34 is injected into the plastic D. Since the plastic flow of the plastic D is not blocked by the predetermined light source holes 34 during the injection of the plastic D, it is possible to exhibit a uniformly distributed state without the generation of the bonding wires in the prior art. As shown in Fig. 4, when the number of preset light source holes 34 is an even number, the plastic D is injected into the first light guide plastic feeding point 80 on the same side of the preset light source hole 34. Because the relative position of the first light guide plastic feeding point 80 is not blocked by the preset light source hole 34 and the distribution of the preset light source hole 34 is also uniform, after the plastic d is injected, there is no The phenomenon of uneven distribution occurs, so there is no trouble with the joint line. Of course, when the number of preset light source holes 34 is even, the plastic D can also be injected into the first light guide plastic feeding point 60 on the opposite side of the 11-1287670 of the preset light source hole material, as shown in FIG. . There is also no trouble with the seam line. Finally, after the plastic frame 30 and the light guide plate 32 are integrally formed, the light guide plate having the optical pattern design can be opened (a patterned concave and convex surface above or below the light guide plate for guiding light). Alternatively, a highly reflective and non-absorptive pigment such as Ti 2 can be used to print a circular or square diffusion dot on the bottom surface of the light guide plate 3 by screen printing. Please refer to FIG. 6, which is a flow chart of a method according to another embodiment of the present invention. Step 200: Determine a preset number of light sources of a backlight module. Step 202: providing a first light guide plate plastic feeding point and a second light guide plate plastic feeding point, the first light guiding plate plastic feeding point is adjacent to the preset position of the light source, and the second light guiding plate is plastically advanced. The glue point is away from the preset position of the light source. Step 204: Determine whether the preset number of the light source is an odd number. If yes, go to step 2〇6. If no, go to step 208. • Step 206: When the preset number of the light sources is singular, the second plastic is injected from the plastic entrance point of the second light guide plate to form the light guide plate. Step 208: When the preset number of the light source is an even number, the second plastic is injected from the plastic inlet point of the first light guide plate or the plastic feed point of the second light guide plate to form the light guide plate. Step 210: Inject a first plastic to form a plastic frame. Step 212: Take out the integrally formed plastic frame and the light guide plate. 12 1287670 Different from the method flow chart of FIG. 3, in the embodiment shown in FIG. 6, in the process of two-material injection, the injection molding of the light guide plate (step 206 or step 208) can also be preceded by plastic injection molding. (Step 210). The integrated light guide plate and the manufacturing method of the plastic frame can be applied to various liquid crystal displays. Compared with the prior art, the present invention provides two different plastic guide points for the light guide plate, one plastic plate of the light guide plate is located on the same side of the position where the preset light source is located, and the plastic feed point of the other light guide plate is located in advance. Set the opposite side of the location where the light source is located. In the process of the present invention, when the number of preset light sources is an odd number, the plastic material of the light guide plate located on the opposite side of the position where the preset light source is located is injected into the plastic, so that the plastic temperature is not adjusted. , plastics, melon speed or injection pressure, or two mold temperature or a material with a better fluidity level, can avoid the problem of the production of the bonding wire during the process of injection molding the light guide plate. Although the present invention has been described above by way of a preferred embodiment, it is not intended to limit the invention, and it is to be understood that those skilled in the art can make some changes and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a conventional manufacturing process for manufacturing a plastic frame of a backlight module and a light guide plate by a double material. 13 -1287670 Figure 2 is a flow chart of the method of the present invention. Fig. 3 is a schematic view showing the position of the light guide plate and the position of the preset light source when the preset light source of the backlight module of the present invention is an odd number. FIG. 4 and FIG. 5 are schematic diagrams showing the position of the light guide plate and the preset light source when the preset light source of the backlight module of the present invention is an even number. Figure 6 is a flow chart of a method of another embodiment of the present invention. [Main component symbol description] 12 Plastic frame 16 Adhesive point 20, 34 light source hole 25 Bonding wire 32 Light guide plate 80 Adhesive point 14 Light guide plate 18 Adhesive point 22a, 22b Plastic flow 30 Plastic frame 60, 62 Adhesive point 14