200905256 九、發明說明： 【發明所屬之技術領域】 本發明係有關一種擴散膜光擴散結構之成型方式，尤 指一種可應用於背光模組中擴散膜之光擴散結構之成型 方式及其裝置。 【先前技術】 薄膜電晶體液晶顯示器（TFT-LCD)，係目前能作為顯 示功能之顯示器較廣泛使用之商品，其主要係由二大構件 所組成，一是顯示面板，一是提供該顯示面板光源的背光 模組。該背光模組依其光源位置不同，可分有側光式背光 模組及直下式背光模組。侧光式背光模組大多應用於一般 中、小尺寸之顯示器所用，其搭配之光源則有發光二極體 (LED)或冷陰極燈管。而直下式背光模組則大多應用於較 大尺寸之顯示器，諸如電視機等。 如第一圖所示係為習知之直下式背光模組1中，係具 備一殼體11，該殼體11内面一般塗佈有能做光反射之反 射塗料，或貼附有一層反射膜12，以作光源之反射；再 依序間隔排列有複數個光源13，並於光源13上方設置一 擴散板14,接著於擴散板14上方配置有一個或一個以上 之光擴散膜片15以及一個或一個以上之增亮膜片16最後 再與顯示面板17結合，而形成一薄膜電晶體液晶顯示器 (TFT-LCD)。 如圖所示，設置於殼體11内之光源13導通電源之 後，隨即會予以發出光線，該光線一部分直接朝擴散板 5 200905256 14射入’ 一部分則會反射回殼體u内其他部位，而經反 射膜12進行反射作用，使光線可再次入設置擴散板14， 進入擴散板14之光線於擴散板14内進行擴散，再射入至 光擴散膜片15並做進一步之光源擴散均勻，並由增光膜 片16做光源之集光、聚光之動作，最後提供給予顯示面 板Π，以便顯示面板17獲得均勻且足夠的光源，足以顯 示時使用。 前述擴散板或光擴散片大多以壓克力、聚碳酸酯（pc) 或壓克力與苯乙稀之共聚物⑽等材質所構成之板片體 狀:且具有-定之光穿透率。為了能達成錢擴散及均句 之效果’-般會於其製成時，添加顏料而使之成乳白色狀 以有利於光源之擴散及均勻’甚至會再加人許多即為微小 之擴散粒子140，如第二圖所示，其主要係藉由擴散粒子 140之設置，以達到光線擴散之目的。 14制^如第三圖所示，各擴散粒？ 14G因係於擴散板 成時’將擴餘子14G與基材均句混合後，予以一 之中型該等擴散粒子14G係呈均勾分佈於擴散板14 處卿”t ?發出光線時，會使得各光源13正上方之 二散粒子140 ’但因係呈均句分佈鲁 = 光擴散效果較為-致。但前述 置，並未相對的從正上方處，其中所具有較強之光線位 位均為相得較高之光擴散絲，而是與其他各部 ° 、擴散較果而已。故，位於各光源13正上 6 200905256 方處之擴散板14位置之亮度過於突顯，使整體顯示效果 呈現亮暗不均。 而另種擴散粒子140設置方式係直接利用塗佈方 式，使擴散粒子140直接塗佈於基材表面，如第四圖所 示，而形成表面具有擴散粒子140之擴散板14 ;惟，此 種塗佈方式無法控制各擴散粒子140之密度，使其鋪排效 果不佳，同樣無法達到較佳光線擴散及均勻化之效果。 【發明内容】 本發明係之主要目的即在提供一種可應用於背光模 組中擴散膜之光擴散結構之成型方式及其裝置。 為達上揭目的，本發明主要係先將樹脂熱熔形成漿狀 後，該漿狀樹脂再經由壓出成型而形成擴散膜時，利用滾 輪滚壓該擴散膜之至少一表面，該滾輪之表面係具有複數 圖案，使該擴散膜之至少一表面上形成有相對該複數圖案 之光擴散結構，使光線經過該擴散膜時，藉由各光擴散結 構可發生反射或擴散作用，而達到光線擴散及均勻化之目 的。 本發明之另一目的，係該擴散膜光擴散結構之成型裝 置，係至少包含有：一加熱壓出單元以及滾輪單元，該加 熱壓出單元先將複數樹脂熱熔成漿狀，並將漿狀樹脂由出 料口壓出成型，而滾輪單元係靠近於加熱壓出單元出料口 處，其包含至少一成型滾輪設置於擴散膜一表面處，對該 擴散膜進行滾壓，該成型滾輪之表面係具有複數圖案，使 7 200905256 該擴散膜之至少一表面上形成有相對該複數圖案之光擴 散結構，且可依所需於成型滾輪之表面設計有不同之圖 案。 【實施方式】 本發明之特點，可參閱本案圖式及實施例之詳細說明 而獲得清楚地瞭解。 本發明旨在提供一種擴散膜光擴散結構之成型方 式，如第五圖所示，係包括下列步驟： a. 將樹脂熱熔形成漿狀，請同時配合第六圖所示之成 型裝置2中係包含有一加熱壓出單元21，該加熱壓出單 元21可設有入料口 211及出料口 212，其入料口 211係 與一入料單元23連接，可將複數粒子狀之樹脂A由該入 料單元23入料，並由入料口 211進入加熱壓出單元21 而形成熱熔成漿狀，並將漿狀樹脂由出料口 212壓出成 型，該樹脂A係選自聚曱基丙烯酸曱酯（P丽A)或聚碳酸酯 (PC)或聚對苯二曱酸乙二酯（PET )。 b. 漿狀樹脂經由壓出成型而形成擴散膜B時，利用一 連接靠近於加熱壓出單元21出料口 212處之滾輪單元 22，對該擴散膜B進行滾壓，該滾輪單元22係包含至少 一成型滾輪221設置於擴散膜B —表面B1處，而擴散膜 B之另一表面B2處則設置有一支撐滾輪222,該成型滾輪 221之表面係具有複數圖案223，如第七圖所示，該成型 滾輪221上係一體製成有複數圖案223，各圖案223係為 8 200905256 凹入成型滚輪221表面（或者可凸出於成型滚輪表面），使 該擴散膜B經過滾輪單元22後，其一表面B1.上形成有相 對該複數圖案223之光擴散結構B3。 當然，該滾輪單元22可如第七圖所示包含一成型滾 輪221以及一支撐滾輪222分別設於擴散膜B之二表面 Bl、B2處，使擴散膜B其中一表面上形成有光擴散結構 B3 ;亦可以如第八圖所示，該滾輪單元22包含有二成型 滾輪221分別設於擴散膜B之二表面Bl、B2處，使擴散 膜B二表面上均形成有光擴散結構B3。 另外，複數圖案223亦可利用貼附方式設置於成型滾 輪221上，如第九圖所示，使各圖案223凸出於成型滾輪 221表面，而各圖案223可如圖所示為陣列式排列；亦可 如第十圖所示各圖案223為非陣列式排列。 再者，該滾輪單元22相對於加熱壓出單元21之另側 係進一步設有冷卻單元24,該冷卻單元24可對已成型之 擴散膜B進行冷卻定型之作用。 值得一提的是，本發明可依所需於成型滾輪上預先形 成有複數圖案，利用滾壓之方式使擴散膜形成有相對該複 數圖案之光擴散結構，當擴散膜應用於背光模組時，其光 線經過該擴散膜，藉由各光擴散結構可發生反射或擴散作 用，而達到光線擴散及均勻化之目的，且可利用預先成型 之複數圖案控制擴散膜上各光擴散結構之結構外型或密 度，藉以有效達到光線擴散及均勻化之目的。 本發明之技術内容及技術特點巳揭示如上，然而熟悉 9 200905256 本項技術之人士仍可能基於本發明之揭示而作各種不背 離本案發明精神之替換及修飾。因此，本發明之保護範圍 應不限於實施例所揭示者，而應包括各種不背離本發明之 替換及修飾，並為以下之申請專利範圍所涵蓋。 【圖式簡單說明】 第一圖係為一般直下式背光模組之結構示意圖。 第二圖係為習有擴散板之光擴散示意圖。 第三圖係為第二圖之光線動作示意圖。 第四圖係為另一習有擴散板之擴散粒子成型示意圖。 第五圖係為本發明中擴散膜光擴散結構之成型步驟示意 圖。 第六圖係為本發明中擴散膜光擴散結構之成型裝置示意 圖。 第七圖係為本發明中滾輪單元之結構立體圖。 第八圖係為本發明中滾輪單元之另一結構立體圖。 第九圖係為本發明中單一成型滾輪之結構立體圖。 第十圖係為本發明中單一成型滾輪之另一結構立體圖。 【主要元件代表符號說明】 樹脂A 擴散膜B 表面Bl、B2 光擴散結構B3 200905256 直下式背光模組1 殼體1 反射膜12 光源13 擴散板14 擴散粒子140 光擴散膜片15 增亮膜片16 顯示面板17 成型裝置2 加熱壓出單元21 入料口 211 出料口212 滾輪單元22 成型滾輪221 支撐滾輪222 圖案223 入料單元23 冷卻單元24200905256 IX. Description of the Invention: [Technical Field] The present invention relates to a method of forming a diffused film light diffusing structure, and more particularly to a forming method and a device for a light diffusing structure of a diffusing film in a backlight module. [Prior Art] A thin film transistor liquid crystal display (TFT-LCD), which is currently widely used as a display function display function, is mainly composed of two major components, one is a display panel, and the other is to provide the display panel. The backlight module of the light source. The backlight module can be divided into an edge-lit backlight module and a direct-lit backlight module according to different light source positions. The edge-lit backlight modules are mostly used in general-sized and small-sized displays, and the light source is a light-emitting diode (LED) or a cold cathode lamp. Direct-lit backlight modules are mostly used in larger-sized displays, such as televisions. As shown in the first figure, the direct type backlight module 1 is provided with a casing 11 which is generally coated with a reflective paint capable of light reflection or a reflective film 12 attached thereto. For the reflection of the light source; a plurality of light sources 13 are arranged at intervals, and a diffusion plate 14 is disposed above the light source 13, and then one or more light diffusion films 15 and one or more are disposed above the diffusion plate 14. More than one brightness enhancing film 16 is finally combined with the display panel 17 to form a thin film transistor liquid crystal display (TFT-LCD). As shown in the figure, after the light source 13 disposed in the casing 11 is turned on, light is emitted, and a part of the light is directly incident on the diffusing plate 5 200905256 14 and is reflected back to other parts in the casing u. The reflection film 12 performs reflection so that the light can be re-entered into the diffusion plate 14, and the light entering the diffusion plate 14 is diffused in the diffusion plate 14, and then incident on the light diffusion film 15 to further diffuse the light source evenly, and The light-increasing film 16 is used as a light collecting and collecting action of the light source, and finally, the display panel 给予 is provided, so that the display panel 17 obtains a uniform and sufficient light source, which is sufficient for display. The diffusing plate or the light-diffusing sheet is often in the form of a sheet made of a material such as acrylic, polycarbonate (PP) or a copolymer of acryl and styrene (10): and has a predetermined light transmittance. In order to achieve the effect of money diffusion and the same sentence, it is generally added to the pigment to make it milky white to facilitate the diffusion and uniformity of the light source. It may even add a lot of tiny diffusion particles 140. As shown in the second figure, it is mainly through the arrangement of the diffusion particles 140 to achieve the purpose of light diffusion. 14 system ^ As shown in the third figure, each diffusion particle? 14G is caused by mixing the diffuser 14G with the substrate when the diffusion plate is formed, and then a medium-sized diffusion particle 14G is uniformly distributed on the diffusion plate 14 to emit light. The two scattered particles 140' directly above each light source 13 are formed by a uniform sentence, and the light diffusion effect is relatively high. However, the foregoing arrangement is not relatively straight from above, and has a strong light position. The light diffusing filaments are all higher in phase, but are more fruitful than the other parts. Therefore, the brightness of the diffusing plate 14 located at the front of each light source 13 is relatively prominent, so that the overall display effect is bright and dark. The diffusion layer 140 is disposed directly by using a coating method to directly apply the diffusion particles 140 to the surface of the substrate, as shown in the fourth figure, to form a diffusion plate 14 having diffusion particles 140 on the surface; Such a coating method cannot control the density of each of the diffusion particles 140, so that the effect of the deposition is not good, and the effect of better light diffusion and homogenization cannot be achieved. [Invention] The main purpose of the present invention is to provide a The invention can be applied to a light diffusion structure of a diffusion film in a backlight module and a device thereof. In order to achieve the above object, the present invention mainly comprises the following steps of: hot-melting a resin into a slurry, and then the paste resin is formed by extrusion molding. When the diffusion film is formed, at least one surface of the diffusion film is rolled by a roller, and the surface of the roller has a plurality of patterns, so that at least one surface of the diffusion film is formed with a light diffusion structure opposite to the plurality of patterns, so that the light passes through the surface In the case of the diffusion film, the light diffusion structure can be reflected or diffused to achieve the purpose of light diffusion and homogenization. Another object of the present invention is to form a device for diffusing the light diffusion structure of the diffusion film, which comprises at least: a heating and extruding unit and a roller unit, the heating and extruding unit first heat-melts the plurality of resins into a slurry, and the slurry resin is extruded from the discharge port, and the roller unit is close to the discharge port of the heating and pressing unit. Wherein, the at least one forming roller is disposed at a surface of the diffusion film, and the diffusion film is rolled, and the surface of the forming roller has a plurality of patterns, so that 7 200 905256 The light diffusing structure of the plurality of patterns is formed on at least one surface of the diffusing film, and different patterns are designed according to the surface of the forming roller. [Embodiment] The features of the present invention can be referred to the drawing. The detailed description of the embodiments is clearly understood. The present invention is directed to providing a method for forming a diffused film light-diffusing structure, as shown in the fifth figure, comprising the following steps: a. hot-melting the resin into a slurry, please At the same time, the molding device 2 shown in FIG. 6 includes a heating and extruding unit 21, and the heating and pressing unit 21 can be provided with a feeding port 211 and a discharging port 212, and the feeding port 211 is connected with a feeding material. The unit 23 is connected, and the plurality of granular resin A can be fed from the feeding unit 23, and enters the heating and extruding unit 21 from the inlet port 211 to form a hot melt slurry, and the slurry resin is discharged from the discharge port. 212 is extrusion molded, and the resin A is selected from the group consisting of polydecyl acrylate (P A) or polycarbonate (PC) or polyethylene terephthalate (PET). b. When the slurry resin is formed into a diffusion film B by extrusion molding, the diffusion film B is rolled by a roller unit 22 that is connected to the discharge port 212 of the heating and pressing unit 21, and the roller unit 22 is rolled. The at least one forming roller 221 is disposed at the surface B1 of the diffusion film B, and the other surface B2 of the diffusion film B is provided with a supporting roller 222. The surface of the forming roller 221 has a plurality of patterns 223, as shown in the seventh figure. The forming roller 221 is integrally formed with a plurality of patterns 223, each of which is 8 200905256 recessed into the surface of the forming roller 221 (or may protrude from the surface of the forming roller), so that the diffusion film B passes through the roller unit 22 A light diffusion structure B3 opposite to the complex pattern 223 is formed on one surface B1. Of course, the roller unit 22 can include a forming roller 221 and a supporting roller 222 respectively disposed on the two surfaces B1 and B2 of the diffusion film B as shown in FIG. 7 to form a light diffusing structure on one surface of the diffusion film B. B3; as shown in the eighth figure, the roller unit 22 includes two forming rollers 221 respectively disposed on the two surfaces B1 and B2 of the diffusion film B, so that the light diffusion structure B3 is formed on both surfaces of the diffusion film B. In addition, the plurality of patterns 223 may also be disposed on the forming roller 221 by means of attachment. As shown in the ninth figure, each pattern 223 is protruded from the surface of the forming roller 221, and each pattern 223 may be arranged in an array as shown. Also, as shown in the tenth figure, each of the patterns 223 is a non-array type arrangement. Further, the roller unit 22 is further provided with a cooling unit 24 on the other side of the heating and pressing unit 21, and the cooling unit 24 can cool and shape the formed diffusion film B. It is to be noted that, in the present invention, a plurality of patterns are preliminarily formed on the forming roller, and the diffusion film is formed into a light diffusing structure relative to the plurality of patterns by rolling, when the diffusion film is applied to the backlight module. The light passes through the diffusion film, and the light diffusion structure can reflect or diffuse to achieve the purpose of light diffusion and homogenization, and the pre-formed complex pattern can be used to control the structure of each light diffusion structure on the diffusion film. Type or density, in order to effectively achieve the purpose of light diffusion and homogenization. The technical content and technical features of the present invention are disclosed above, but those skilled in the art will be able to make various substitutions and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should be construed as being limited by the scope of the appended claims. [Simple description of the diagram] The first diagram is a schematic diagram of the structure of a general direct type backlight module. The second figure is a schematic diagram of light diffusion with a diffusion plate. The third figure is a schematic diagram of the light action of the second figure. The fourth figure is a schematic diagram of another diffusion particle forming with a diffusion plate. Fig. 5 is a schematic view showing the molding steps of the diffusing film light-diffusing structure of the present invention. Fig. 6 is a schematic view showing a molding apparatus for a diffusing film light-diffusing structure of the present invention. The seventh drawing is a perspective view of the structure of the roller unit in the present invention. The eighth figure is a perspective view of another structure of the roller unit of the present invention. The ninth drawing is a perspective view of the structure of a single forming roller in the present invention. The tenth figure is another perspective view of the structure of the single forming roller in the present invention. [Description of main component representative symbols] Resin A Diffusion film B Surface Bl, B2 Light diffusion structure B3 200905256 Direct type backlight module 1 Case 1 Reflective film 12 Light source 13 Diffusion plate 14 Diffusion particles 140 Light diffusion film 15 Brightening film 16 Display panel 17 Forming device 2 Heating and pressing unit 21 Inlet port 211 Outlet port 212 Roller unit 22 Forming roller 221 Support roller 222 Pattern 223 Feeding unit 23 Cooling unit 24