M352050 八、新型說明： 【新型所屬之技術領域】 本創作關於-種背光模組巾的膜拉伸裝置，更具體地說，關 於-種能夠均扯伸背細財的光學膜賴⑽裝置，以及使 用該膜拉伸裝置的背光模組。 【先前技術】 奇光模組是平板顯示設備，比如液晶顯示器(LCD)的重要部 件’由於液晶面板本身不具發光雛，必須借助#光模組來達到 顯示的功能。 背光模組其主要由光源(包括冷陰極營光管(CCFL)、熱陰極螢 光管、發光二極體(LED)等)、燈罩、反射板(Reflect〇r)、導光板(Ught guide plate)、紐板、光學膜及外框等元件組裝域，其中光學膜 的光學和物理屬性直接影響到背光模組以及液晶顯示器①⑶)的 隹此光痛通常是—層厚度很薄麵，因此自身不具備支撐的 月b力需要彳曰助外力來支撐光學膜使之中間部分不會下垂。最常 用的裝置讀光學膜置於錄板上，借助擴散板，光學膜能夠均 勻地被支撐，從而提供較佳的光學屬性。使用擴散板的缺陷是背 光模、且的n積和重量都會變得比較大’不利則、型化的應用。於 疋針對較小型的液晶顯示器①CD)的應帛，提出了多種拉伸光學 膜的方案’其能夠省去對於擴散板的使用。 圖1a和lb所示的是兩種習知的支撐光學膜的方案。其基本 的結構如下：對於數片光學膜l〇2a、獅，分別提供數個固定件 6 M352050 1 馳、獅來對光學膜l〇2a、102b進行分別的固^。固^件104a、 • 104b各自連接到—彈簧（拉簧）l〇6a、勵的一端。彈簧臟、 106b的另-端固定在—基座應上，基座固定於背光模組的外框 架110上。藉由上述結構，使光學膜處於拉伸狀態來支撐光學膜， 使之中間部分不會下垂。圖la和圖lb所示的方案的區別在於： 圖1a所示的方案中，彈簧應a、106b處於水平的狀態、，直麟 104a、l〇4b進行拉伸，而在圖lb所示的方案中，彈簧1〇如、1〇肋 春處於垂直的狀態。兩種方案的基本工作原理是相同的。 圖la和圖lb所不的方案存在的缺陷為··不同的光學膜之間 有間隙’由於母一層膜l〇2a、l〇2b是分別由一個固定件i〇4a、l〇4b 進行固定，而固定件l〇4a、l〇4b必然存在一定的厚度。於是，膜 與媒之間就存在一疋的間隔。對於光學膜組中的光學膜來說，微 小的膜間間隙都會帶來可觀的光亮度損耗，因此圖la和圖比所 示的方案在光亮度上都存在缺陷。 鲁目2是另-個習知的支撐光學膜的方案，其與圖^和lb的 方案相比較，區別在於不使用彈簧。圖2所示的方案中，固定件 是直接連接到外框架，根據設計的初衷，這些固定件是儘量向外 拉伸以使光學膜處於拉伸狀態來支撐光學膜。由於在製造背光模 組通常是在常溫下，因此固定件的設計都是在常溫的環境下進行 的，即，在常溫下，固定件固定在一位置。但是當溫度改變出現 熱脹冷縮的現象時，光學膜的體積會擴張，而固定件的位置無法 變化，使得光學膜擴張部分的體積只能向中間部分下垂。對於溫 7 M352050 ' f續帶細舰冷_題’圖2财錢猶提供有效的克服 • 2。林岐’液關_CD江舞溫度會急齡高，因而 先子膜的熱脹冷縮現象是十分明顯的。請參考圖2，膜下垂時，其 與先源的距離發生變化，這會影響到背光模組的整體光學性能。 無論在la、lb還是圖2所示的方案中，由於每一個固定件 都是獨立地連接，_定件與朗接觸部分面積較小，這就造成 了對於整個絲齡力㈣自。與_接物分受的拉力 大，其他部分受的拉力小。對於光學臈來說， 會影響到其絲倾。 狀 【新型内容】 為了克服現有技術中存在_題，本創作提出—種新型的用 於背光模組的臈拉伸裝置。 依據本創麵—實_，提供光模組，其舰在於包 外框架’至4_光學膜；至少—拉伸件；至少—固定件；至 ^施力裝置。外购具有至少—框邊。光學膜設置於外框架内 ^且具有至少-對應_的側邊。拉伸件通過滑動元件安裝于框 ，以使拉伸件能夠相對于框邊向著外框架的外侧方向移動，且 f膜的側邊峡於拉伸件。賴蚊於外框架的框邊。施力 二置連接於拉伸件及固定件，用以提供拉伸件向外侧方向移動的 施力。依據本創作的一實施例’拉伸件上具有數細於固定膜 的膜固疋結構。依據本創作的一實施例，多層的膜可以相互疊加 之後-起由_定結構固定，從而膜之間的間隙。 8 M352050 細，拉伸件上提供了滑峨，在外框 架上的謝滑動槽，滑動槽的形狀與滑動突塊相匹配 從 動犬塊在滑動槽内滑動並帶動拉伸件相對外框架移動。拉伸件和 外框架的姉_使得齡_冷縮時關具核_空間， 而防止出顏與賴、之間的距料穩定的情況。 依據本創作的—實_，拉伸件和固定件圍_的週邊，並 且膜固找構為-舰塊，❹㈣的聽關使騎於膜的拉 力均勻分佈。 採用本創作的一實施例的技術方案，有效地克服了上述的問 題])消除了膜之間的_、2)考慮了熱脹冷縮的情況，使得 膜與光源之間的距離穩定、3)使得對於膜的拉力均句。 【實施方式】 參考圖3a、圖3b和圖3c所示，本創作一實施例提供的用於 背光模組的膜拉伸裝置包括： 至少一固定件202，固定於背光模組的外框架2〇1。外框架2〇1 可以為矩形，且具有四個圍成一矩形的側邊，固定件2〇2設置於 外框架201的-側邊上，固定件2G2的作用是為了給與施力裝置 2〇6以支標，在圖3a-3c所示的實施例中，固定件2〇2實際與外框 架201連為一體。在其他的實施方式中，固定件2〇2可以是與外 框架分離的部件，但是，固定件202與外框架201之間應當是相 互固定的，以便為置於其上的施力裝置206提供穩定的支撐。為 了使得拉力均勻’本創作中固定件2〇2具有數個，分別位於膜2〇3 9 M352050 的週邊。 至少-拉伸件204，拉伸件观通過至少—施力裝置與至 =固疋件202相連。該施力裝置2〇6 —般為彈菁，在該實施例 中為扭簧’扭細在_ 2Q2上。參相城所示，固定件 202上有-突起施’扭簧施的中段部位套於該突起遍上， 歧，扭簧2〇6可以繞該突起纖轉動。扭簀細的一端抵接於 固定件202底部的-檔塊施，另一端連接於拉伸件辦上。這 樣，由於扭簧206的中段部位和其中一端都被固定件2〇2限定了 位置，只有連接於拉伸件204的這一端是開放的，因此，扭菁· 就能依靠其彈簧力提供拉力，將拉伸件綱向著膜挪的週邊方 向拉伸’從而將光學膜拉緊，解決光學膜中間部位下垂的問題。 參考圖4a及圖也在本實用新型t，拉伸件胸通過滑動元件· 安震於外框架2〇1的框邊上，滑動元件·是為了克服熱服冷縮 的情況而設計’下面將會詳細的描述，伸件綱分別位於膜2〇3 的週邊，於本實例中’膜203為矩形具有四個側邊，每一侧邊對 應框邊’拉伸件204上包括數細於固定膜2〇3的膜固定結構 2〇4a。參考圖3b所示’膜固定結構職為一列定位突塊。根據該 實施例，在外框架上，沿著膜2〇3的週邊，在每一條邊上都佈置 有-列定位突塊204a ’與之對應的，在膜加的每一條邊上都佈 置有-列開孔篇，以與上述的定位突塊職相配合。在本創作 中，施力部件206施加的拉力是作用到拉伸件2〇4上，再由拉伸 件上的膜固定結構2〇4a it過開孔203a作用到膜2〇3上。本創作 M352050 中’在膜203的每-個側邊上以較小的間隔佈置了較多數量的開 ^ 孔203a和膜固定結構施，可參考圖5所示，因而能多句使得作用 在膜，每-_上得拉力_均勻的分散，使㈣受到的拉力能 夠儘量均勻地分佈與整個膜上，減少由於拉力分配不均帶來的膜 變形It况。同時’由於本創作巾使収位突塊作為翻定結構， 因=在膜上設置相應的開孔之後，數片光學膜能相互堆疊，一同 固疋於&位突塊上，參相3e所示。由於傳統_定件不再使用， 籲目此臈與膜之間的間隔就能被消除。 為了能夠魏地防止酿冷縮的情況下誠的麟光源之間 距離不穩定的情況。本創作專門謂了拉伸件和外框架之間的相 對移祕構’通過拉伸件的移練為_熱脹冷縮提供賴，減 -輕膜的中間部位出現下垂的現象。參考圖4a和圖4b所示，拉伸 件204和外框架201之間提供滑動元件2〇8來實現上述的功能， 該滑動組件208包括：位於拉伸件2〇4上的滑動突塊，以及位 釀於外框架2〇1上的滑_ 282，滑動槽如的形狀與滑動突塊28〇 相匹配。滑動突塊可以沿著滑動槽挪在4的範圍之内來 回移動，實質上，為與滑動突塊連接的拉伸件綱提供了相 .對於外框架2〇1來回移動的空間。在本實施例中滑動突塊和 滑動槽282都是使用橫截面為圓形的結構。通過滑動突塊在 滑動槽282内滑動使得拉伸件麵外框架2〇ι移動。參考圖 知，當溫度升高，膜體積脹大時，拉伸件m相對於外框架2〇ι 向著外側方向移動，為膜的脹大提供空間。參考圖扑所示，當溫M352050 VIII. New description: [New technical field] This is a film stretching device for a kind of backlight module towel, and more specifically, an optical film (10) device capable of pulling back the fine money. And a backlight module using the film stretching device. [Prior Art] The odd-light module is a flat panel display device, such as an important component of a liquid crystal display (LCD). Since the liquid crystal panel itself does not have a light-emitting body, it is necessary to use the #光光模块 to achieve the display function. The backlight module is mainly composed of a light source (including a cold cathode camping tube (CCFL), a hot cathode fluorescent tube, a light emitting diode (LED), etc.), a lamp cover, a reflector (Reflect〇r), and a light guide plate (Ught guide plate). ), the new board, the optical film and the outer frame and other component assembly fields, wherein the optical and physical properties of the optical film directly affect the backlight module and the liquid crystal display 1 (3)), the light pain is usually - the thickness of the layer is very thin, so itself The monthly b force without support needs to help the external force to support the optical film so that the middle portion does not sag. The most commonly used device read optical film is placed on the tablet, and the optical film can be evenly supported by the diffuser plate to provide better optical properties. A defect in the use of a diffusing plate is that the backing mode and the n-product and weight are relatively large, which is an unfavorable and shaped application. In response to the application of the smaller liquid crystal display (LCD), various proposals have been made to stretch the optical film, which can eliminate the use of the diffusion plate. Figures 1a and 1b show two conventional solutions for supporting an optical film. The basic structure is as follows: For several optical films l〇2a and lions, several fixing members are provided respectively. 6 M352050 1 Chi and lion are separately fixed to the optical films l〇2a and 102b. The fixing members 104a, 104b are each connected to a spring (tension spring) l〇6a, one end of the excitation. The spring is dirty, and the other end of the 106b is fixed on the base, and the base is fixed on the outer frame 110 of the backlight module. With the above structure, the optical film is stretched to support the optical film so that the intermediate portion does not sag. The difference between the scheme shown in FIG. 1 and FIG. 1b is as follows: In the scheme shown in FIG. 1a, the springs a, 106b are in a horizontal state, and the straight linings 104a, 104b are stretched, and the one shown in FIG. In the solution, the spring 1 is, for example, 1 rib spring is in a vertical state. The basic working principle of the two schemes is the same. The disadvantages of the schemes of Fig. 1a and Fig. 1b are that there are gaps between different optical films. Since the mother films l〇2a and l2b are fixed by one fixing member i〇4a, l〇4b, respectively. And the fixing members l〇4a, l〇4b necessarily have a certain thickness. Thus, there is a gap between the membrane and the medium. For the optical film in the optical film group, the small inter-film gap brings about a considerable loss of lightness, so the schemes shown in Figs. 1 and 3 have defects in brightness. Lum 2 is another conventional solution for supporting an optical film, which is compared with the scheme of Figs. 2 and 1b, except that no spring is used. In the arrangement shown in Figure 2, the fasteners are attached directly to the outer frame, and depending on the original design, the fasteners are stretched as far as possible to hold the optical film in tension to support the optical film. Since the backlight module is usually manufactured at a normal temperature, the design of the fixing member is carried out under a normal temperature environment, that is, at a normal temperature, the fixing member is fixed at a position. However, when the temperature changes and the phenomenon of thermal expansion and contraction occurs, the volume of the optical film expands, and the position of the fixing member cannot be changed, so that the volume of the expanded portion of the optical film can only hang down toward the intermediate portion. For the temperature of 7 M352050 'f continue to bring the fine ship cold _ title' Figure 2 money is still providing effective overcoming • 2. Lin Biao's liquid _CD Jiang dance temperature will be high, so the thermal expansion and contraction phenomenon of the zizi membrane is very obvious. Referring to Figure 2, when the film sags, its distance from the source changes, which affects the overall optical performance of the backlight module. Regardless of the schemes shown in la, lb or Fig. 2, since each of the fixing members is independently connected, the area of the _piece and the lang contact portion is small, which results in the entire age of the wire (four). The tension with the _-substrate is large, and the tension of other parts is small. For optical enamel, it will affect its silk tilt. [New content] In order to overcome the existing problems in the prior art, the present invention proposes a novel 臈 stretching device for a backlight module. According to the present invention, the optical module is provided, and the ship is in the outer frame 'to 4_ optical film; at least the tensile member; at least the fixing member; to the force applying device. Outsourcing has at least - framed edges. The optical film is disposed within the outer frame and has at least a side corresponding to _. The stretching member is attached to the frame by the sliding member so that the stretching member is movable toward the outer side of the outer frame with respect to the frame edge, and the side of the f film is slid into the stretching member. Lay mosquitoes are on the side of the frame of the outer frame. The force is applied to the tensile member and the fixing member to provide a force for the stretching member to move outward. According to an embodiment of the present invention, the stretched member has a plurality of film-solid structures which are finer than the fixed film. According to an embodiment of the present invention, the multi-layered films may be superimposed on each other and then fixed by a predetermined structure so as to have a gap between the films. 8 M352050 Fine, the sliding member is provided with a sliding slat on the outer frame. The shape of the sliding groove matches the sliding protrusion. The moving dog block slides in the sliding groove and drives the stretching member to move relative to the outer frame. The 姊_ of the stretched member and the outer frame makes it possible to close the core_space while shrinking, and prevent the distance between the face and the ray from being stable. According to the creation of the real--, the extension of the tensile member and the fixing member, and the film is solid-structured as a ship block, the hearing of the ❹(4) makes the tension on the film evenly distributed. With the technical solution of an embodiment of the present invention, the above problems are effectively overcome]) the _, 2) between the films is eliminated, and the thermal expansion and contraction is considered, so that the distance between the film and the light source is stable, 3 ) makes the tension for the film uniform. [Embodiment] Referring to FIG. 3a, FIG. 3b and FIG. 3c, a film stretching device for a backlight module according to an embodiment of the present invention includes: at least one fixing member 202 fixed to an outer frame 2 of a backlight module 〇1. The outer frame 2〇1 may be rectangular and has four sides which are formed into a rectangle. The fixing member 2〇2 is disposed on the side of the outer frame 201, and the fixing member 2G2 functions to give the force applying device 2 The 〇6 is in the form of a support. In the embodiment shown in Figs. 3a-3c, the fixing member 2〇2 is actually integrated with the outer frame 201. In other embodiments, the fixing member 2〇2 may be a separate component from the outer frame, but the fixing member 202 and the outer frame 201 should be fixed to each other to provide the force applying device 206 placed thereon. Stable support. In order to make the pulling force uniform, there are several fixing members 2〇2 in the present invention, which are respectively located at the periphery of the film 2〇3 9 M352050. At least the tensile member 204, the tensile member is connected to the solid member 202 by at least a force applying device. The urging means 2 〇 6 is generally an elastomer, in this embodiment a torsion spring 'twisted on _ 2Q2. As shown in the reference phase, the middle portion of the fixing member 202 having the -protrusion applied to the torsion spring is placed over the protrusion, and the torsion spring 2〇6 can be rotated around the protruding fiber. The twisted end abuts against the -block of the bottom of the fixture 202 and the other end is attached to the tensile member. Thus, since the middle portion and one end of the torsion spring 206 are defined by the fixing member 2〇2, only the end connected to the stretching member 204 is open, so that the twisting gel can provide a pulling force by virtue of its spring force. The tensile member is stretched toward the peripheral direction of the film to pull the optical film tightly, thereby solving the problem of sagging in the middle portion of the optical film. Referring to Fig. 4a and Fig. 4 also in the present invention t, the tensile member chest is passed through the sliding member and is shocked on the frame side of the outer frame 2〇1, and the sliding member is designed to overcome the cold shrinkage of the hot clothes. As will be described in detail, the extensions are located at the periphery of the film 2〇3, respectively. In the present example, the film 203 has a rectangular shape with four sides, and each side corresponds to the frame edge. The tensile member 204 includes a number of finer than fixed. The film fixing structure 2〇4a of the film 2〇3. Referring to Figure 3b, the film-fixing structure is a column of positioning projections. According to this embodiment, on the outer frame, along the periphery of the film 2〇3, on each side, a column-arcing projection 204a' is disposed corresponding thereto, and each side of the film is disposed with - The column is opened to match the above-mentioned positioning projections. In the present creation, the pulling force applied by the urging member 206 acts on the stretching member 2〇4, and the film fixing structure 2〇4a it on the stretching member acts on the film 2〇3 through the opening 203a. In the creation M352050, a larger number of opening holes 203a and a film fixing structure are disposed on each side of the film 203 at a small interval, which can be referred to FIG. 5, and thus can be applied in multiple sentences. The film, the tensile force per__ is uniformly dispersed, so that the tensile force received by (4) can be distributed as evenly as possible on the entire film, and the film deformation due to the uneven distribution of the tensile force is reduced. At the same time, 'Because the creation of the towel makes the plucking block as a tumbling structure, after the corresponding opening is set on the film, several optical films can be stacked on each other, and are fixed together on the & position bump, phase 3e Shown. Since the conventional _piece is no longer used, the gap between the 臈 and the film can be eliminated. In order to be able to prevent the instability of the distance between the lining light sources in the case of cold shrinkage. This creation specifically refers to the relative movement between the tensile member and the outer frame. The reorientation of the tensile member provides the phenomenon of sag and shrinkage in the middle portion of the reduced-light film. Referring to Figures 4a and 4b, a sliding element 2 〇 8 is provided between the tensile member 204 and the outer frame 201 to perform the functions described above, the sliding assembly 208 comprising: a sliding projection on the tensile member 2〇4, And a sliding _ 282 which is placed on the outer frame 2〇1, and the shape of the sliding groove is matched with the sliding protrusion 28〇. The sliding projection can be moved back along the sliding groove within the range of 4, and substantially provides a phase for the tensile member connected to the sliding projection. The space for the outer frame 2〇1 to move back and forth. In the present embodiment, both the sliding projection and the sliding groove 282 are configured to have a circular cross section. The tensile member outer frame 2〇 is moved by the sliding projection sliding in the sliding groove 282. Referring to the drawing, when the temperature rises and the film volume expands, the stretching member m moves toward the outer side with respect to the outer frame 2〇, providing a space for the expansion of the film. Refer to the map, when the temperature