200931120 九、發明說明： 【發明所屬之技術領域】 本發明係提供一種背光模組之背框結構，尤指一種用 以支撐光學膜片之背框結構。 【先前技術】 習知液晶顯示器是以背光模組（backlight module)來提供 其所需之平面光。 背光模組中用以提供光線之發光元件，可以是發光二 ® 極體(light emitting diode ; LED)等點狀光源、冷陰極螢光燈管 (cold cathode fluorescent lamp ; CCFL)等線狀光源，或是平面 螢光燈（flat fluorescent lamp ; FFL)等之面狀光源。 不論採用何種光源作為發光元件，背光模組通常會在發光 元件上方以一特定距離間隔地設置一光擴散片（diffUser plate)，藉以對光源所發出之光線進行均勻化。 然而，由於習知背光模組僅將光擴散片以其周緣固定 ❿於背框，當背光模組朝大尺寸發展，致使内部之光擴散片 尺寸隨之變大，造成該光擴散片長時間受重力作用後，光 擴散片中央處容易產生向下凹曲的變形，而影響整體背光 模組之發光均勻性，甚至影響背先模組之結構強度。 【發明内容】 本發明之一目的，在於提供一種背光模組之背框結 構，可防止光學膜片向下凹曲變形，以避免影響背光模組 之發光均勻度。 為達上述目的，本發明提供一種背光模組之背框結 5 200931120 構’用以t設-或以上之光學膜片及二或以上之發光元 件’該背框結構包含-背框，及—支撐肋條，其中該背框 包含-底壁及-由該底壁周緣向上延伸接觸該光學膜片之 圍繞壁，而該支撐肋條沿該底壁上表面延伸設置，且該肋 條界定該底壁上表面形成二分別供該等發光元件設置之容 置空間’另該肋條具有一面朝該光學膜片之反射面，該反 射面用以將該發光元件所發之光線至少部分地反射至該光 學膜片。 ° ❹【實施方式】 有關本發明之技術内容及詳細說明，配合圖式說明如 下： 參閱第-圖及第二圖，本發明之第一較佳實施例的背 框結構，係用於裝設背光模組之—或以上之光學膜片4〇及 二或以上之發光元件30，該背框結構包含一背框1〇，以及 一支撐肋條21 ;其中，該背框1〇包含一矩形底壁u，以及 ❹一由該底壁11周緣向上延伸接觸該光學膜片40之圍繞壁 12，在本實施例中，該肋條21係沿底壁丨丨上表面之短軸方 向延伸設置，實際實施時，如第三圖所示，該肋條21亦可 Λ該底壁11上表面之長軸方向延伸，並且該肋條21數量不 限於一，可視實際需求加以調整；又，該肋條21界定該底 壁11上表面形成二相間隔且分別供該等發光元件30設置之 容置空間23 另外，該肋條21為透明實心體，為聚丙烯酸樹脂、聚 石反酸脂、聚乙婦樹脂，或聚曱基丙稀酸曱脂等聚脂材質所 6 200931120 裝成°玄肋條21具有一面朝該光學膜片40之反射面211， 二反射® 211 <剖面輪廓概呈倒v形，且該倒v形剖面輪 =有:圓滑狀頂緣212，該肋條21可藉該反射面2ιι將 該X光7L件30所發之光線部分地反射至該光學膜片奶，並 可將另。P刀折射進入肋條21内之光線再朝該光學膜片仙之 方向折射。 此外，參閱第四圖，肋條21亦可為不透明空心體，其 ❿可用不透明聚自θ (PET)等材質之薄板加工製成。該肋條 之反射面211可將該發光元件30所發之光線實質地完全 反射至該光學膜片40，在本實施例中，該光學膜片40為-光擴散片，實際實施不以此限。 參閲第二圖及第四圖，該肋條21之頂緣212與該光學 膜片40之間存在一間隙，換句話說，原始狀態之肋條^並 未與光學膜片4G接觸，而是在光學膜片4()、經過—段時間之 使用後，發生微幅下凹而接觸頂緣212時，藉設置於底壁 〇 11上之肋條21作為防止光學膜片40進一步下凹之支撐。並 且，當光學膜片40下凹時，由於肋條21僅以其頂緣212支 撐光學膜片40，故將肋條21與光學膜片4〇之接觸面積減至 最小，並且，肋條21更以其反射面211將光線朝光學膜片 40反射及/或折射，使背光模組於肋條21設置處不致產生 暗帶，以避免影響背光模組之發光均勻度。 此外，參閱第五圖，本發明亦可將該肋條21係以其頂 緣212接觸地支撐該光學膜片4〇。 ' ' 在本實施例中，各該發光元件30以一設置於該底壁u 200931120 上之平面螢光燈為例。 參閱第六圖，本發明之第二較佳實施例之背框結構， 大致與第一較佳實施例相同，不同之處在於，該背框結構 更包含一沿底壁11上表面之長軸方向延伸的支撐肋條22， 且該肋條22與沿底壁π上表面之短軸方向延伸的支撐肋條 21 乂會於底壁η之中心處；此外，該肋條。的數量亦不限 於，可視貫際需求調整其數量，該等肋條21、22界定該 ❹底壁11上表面形成四個相間隔且分別供四個發光元件3〇設 置之容置空間23。 參閱第七圖’本發明之第三較佳實施例的背框結構， 大致與第一較佳實施例相同，不同之處在於，本實施例之 發光元件30包含多數個冷陰極螢光燈管31，且本實施例更 將一反射板50設置於在底壁u與肋條21之間，用以將冷陰 極螢光燈管31向下發射之光線向上反射。 >閱第八圖，本發明之第四較佳實施例的背光模組， 〇大致與第-較佳實施例相同，不同之處在於，本實施例更 將-電路板60設置於在底壁u與肋條21之間，且本實施例 之發光το件30包含多數個設置於該電路板6〇上的 體31。 ^綜上所述，本發明之背框結構藉由在背框之底壁1 上-又置該等支撲肋條21、22，可有效支撐該光學膜片仙， 以防止光學膜片4〇中央處產生過度之下凹變形，並可將系 = =3()所發之光線朝光學膜㈣反射及， 免影響背光模組之發光均勻度。 200931120 上述僅為本發明之較佳實施例而已 發明實施之範圍。只^ 並非用來限定本 比昆士 凡依本發明申請專利範圍所作之變化| 修飾，皆屬本發明之專利範圍所涵蓋。 之變化與 【圖式簡單說明】 第一圖 第二圖 第三圖 第四圖 第五圖 第六圖 第七圖 第八_ ”發明之背光模組之背框結構的立體分解圖。 :、、發明之背光模組之背框結構的剖視示意圖。 為本發明之背光模組之背框結構的立體分解圖。 ❹ 為本發明之背光模組之背框結構的剖視示意圖。 為本發明之背光模組之背框結構的剖視示意圖。 為本發明之背光模組之背框結構的立體分解圖。 為本發明之背光模組之背框結構的剖視示意圖。 為本發明之背光模組之背框結構的剖視示意圖。 主要元件符號說明】200931120 IX. Description of the Invention: [Technical Field] The present invention provides a back frame structure of a backlight module, and more particularly to a back frame structure for supporting an optical film. [Prior Art] A conventional liquid crystal display is a backlight module that provides a desired planar light. The light-emitting element for providing light in the backlight module may be a point light source such as a light emitting diode (LED) or a linear light source such as a cold cathode fluorescent lamp (CCFL). Or a planar light source such as a flat fluorescent lamp (FFL). Regardless of which light source is used as the light-emitting element, the backlight module usually has a diffuser plate disposed at a certain distance above the light-emitting element to homogenize the light emitted by the light source. However, since the conventional backlight module only fixes the light diffusion sheet to the back frame with its peripheral edge, when the backlight module is developed toward a large size, the size of the internal light diffusion sheet becomes large, causing the light diffusion sheet to be subjected to a long time. After gravity, the central portion of the light diffusing sheet is prone to deformation of the downward concave curvature, which affects the uniformity of illumination of the entire backlight module and even affects the structural strength of the module. SUMMARY OF THE INVENTION An object of the present invention is to provide a back frame structure of a backlight module, which can prevent the optical film from being concavely deformed downward to avoid affecting the uniformity of illumination of the backlight module. In order to achieve the above object, the present invention provides a back frame junction of a backlight module 5 200931120 constituting an optical film for t-setting or more and two or more light-emitting elements. The back frame structure includes a back frame, and a support rib, wherein the back frame comprises a bottom wall and - a peripheral wall extending upwardly from the periphery of the bottom wall to contact the optical film, and the support rib extends along the upper surface of the bottom wall, and the rib defines the bottom wall The surface is formed by two accommodating spaces for the illuminating elements respectively. The rib has a reflecting surface facing the optical film, and the reflecting surface is for at least partially reflecting the light emitted by the illuminating element to the optical Diaphragm.实施 [Embodiment] The technical content and detailed description of the present invention are as follows with reference to the drawings: Referring to the first and second figures, the back frame structure of the first preferred embodiment of the present invention is used for mounting The backlight module has one or more optical films 4〇 and two or more light-emitting elements 30, the back frame structure comprises a back frame 1〇, and a supporting rib 21; wherein the back frame 1〇 comprises a rectangular bottom The wall u, and the first one of the bottom wall 11 extends upwardly to contact the surrounding wall 12 of the optical film 40. In the embodiment, the rib 21 extends along the short axis direction of the upper surface of the bottom wall, actually When implemented, as shown in the third figure, the rib 21 may extend in the long axis direction of the upper surface of the bottom wall 11, and the number of the ribs 21 is not limited to one, and may be adjusted according to actual needs; and the rib 21 defines the The upper surface of the bottom wall 11 is formed with two accommodating spaces 23 for the light-emitting elements 30, and the ribs 21 are transparent solid bodies, which are polyacrylic resin, polysulfide, polyacetal resin, or Polyester acrylate resin and other polyester materials The ribs 21 have a reflecting surface 211 facing the optical film 40, the two reflections 211 < cross-sectional profile is inverted v-shaped, and the inverted v-shaped cross-section wheel has: smooth The top edge 212, the rib 21 can partially reflect the light emitted by the X-ray 7L member 30 to the optical film milk by the reflecting surface 2 ι, and can be further. The light that the P-knife refracts into the rib 21 is then refracted toward the direction of the optical film. Further, referring to the fourth figure, the rib 21 may also be an opaque hollow body, and the crucible may be formed by processing a sheet of opaque poly-convex material such as θ (PET). The reflective surface 211 of the rib can substantially completely reflect the light emitted by the light-emitting element 30 to the optical film 40. In the embodiment, the optical film 40 is a light-diffusing sheet, and the actual implementation is not limited thereto. . Referring to the second and fourth figures, there is a gap between the top edge 212 of the rib 21 and the optical film 40. In other words, the ribs of the original state are not in contact with the optical film 4G, but After the optical film 4 () has been used for a period of time, when the micro-pit is formed to contact the top edge 212, the rib 21 provided on the bottom wall 11 serves as a support for preventing the optical film 40 from being further recessed. Moreover, when the optical film 40 is recessed, since the rib 21 supports the optical film 40 only with its top edge 212, the contact area between the rib 21 and the optical film 4 is minimized, and the rib 21 is further The reflecting surface 211 reflects and/or refracts the light toward the optical film 40, so that the backlight module is not disposed at the rib 21 to avoid affecting the uniformity of illumination of the backlight module. Further, referring to the fifth figure, the rib 21 can also support the optical film 4 接触 in contact with the rim 212 thereof. In the present embodiment, each of the light-emitting elements 30 is exemplified by a planar fluorescent lamp disposed on the bottom wall u 200931120. Referring to the sixth embodiment, the back frame structure of the second preferred embodiment of the present invention is substantially the same as the first preferred embodiment, except that the back frame structure further includes a long axis along the upper surface of the bottom wall 11. The support rib 22 extending in the direction, and the support rib 21 extending along the short axis direction of the upper surface of the bottom wall π will be at the center of the bottom wall η; in addition, the rib. The number of the ribs 21, 22 is defined by the ribs 21, 22 defining four accommodating spaces 23 which are spaced apart from each other and are provided with four light-emitting elements 3'' respectively. Referring to the seventh figure, the back frame structure of the third preferred embodiment of the present invention is substantially the same as that of the first preferred embodiment, except that the light-emitting element 30 of the present embodiment includes a plurality of cold cathode fluorescent tubes. 31. In this embodiment, a reflector 50 is disposed between the bottom wall u and the rib 21 for reflecting the downward emission of the cold cathode fluorescent lamp 31 upward. > Referring to the eighth embodiment, the backlight module of the fourth preferred embodiment of the present invention is substantially the same as that of the first preferred embodiment, except that the present embodiment further sets the circuit board 60 to the bottom. Between the wall u and the rib 21, and the illuminating member 30 of the present embodiment includes a plurality of bodies 31 disposed on the circuit board 6''. In summary, the back frame structure of the present invention can effectively support the optical film by using the ribs 21 and 22 on the bottom wall 1 of the back frame to prevent the optical film 4 Excessive concave deformation occurs at the center, and the light emitted by the system ==3() can be reflected toward the optical film (4) without affecting the uniformity of illumination of the backlight module. 200931120 The foregoing is only the scope of the invention as set forth in the preferred embodiments of the invention. The present invention is not limited to the scope of the present invention. The change and the [simplified description of the drawing] The first figure, the second figure, the third figure, the fourth figure, the fifth figure, the sixth figure, the seventh figure, the seventh figure, the eighth _", the three-dimensional exploded view of the back frame structure of the inventive backlight module. The cross-sectional view of the back frame structure of the backlight module of the present invention is an exploded perspective view of the back frame structure of the backlight module of the present invention. 剖 A cross-sectional view of the back frame structure of the backlight module of the present invention. A cross-sectional view of the back frame structure of the backlight module of the present invention. The perspective view of the back frame structure of the backlight module of the present invention is a cross-sectional view of the back frame structure of the backlight module of the present invention. A schematic cross-sectional view of the back frame structure of the backlight module.
10背框 211反射面 22肋條 30發光元件 50反射板 11底壁 21肋條 212頂緣 23容置空間 4〇光學膜片 6〇電路板 12圍繞壁10 back frame 211 reflecting surface 22 rib 30 light emitting element 50 reflecting plate 11 bottom wall 21 rib 212 top edge 23 accommodating space 4 〇 optical film 6 〇 circuit board 12 surrounding wall