1342443 九、發明說明： 【發明所屬之技術領域】1342443 IX. Description of the invention: [Technical field to which the invention belongs]
本發明有關一種顯示器，特別是提供一種平面顯示器之 背光源裝置。 / ' D 【先前技術】The present invention relates to a display, and more particularly to a backlight device for a flat panel display. / ' D [Prior technology]
背光模.组（backHght m〇dule )為平面顯示器，例如一液 晶顯不器（liquid crystal display，LCD)面板的關鍵零組件之 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，使其能正常顯示影像 隨著液晶顯示器製造技術的提昇，在士 趨勢下，背光模組也需考量到輕量化、薄型化寸及低知格， 成了 亮度及降低成本的市場要求，為保持在未來市二=力高 開發與設計新型的背光模組及射出成型的新製作 一項重要的課題。 ^The backlight module (backHght m〇dule) is a flat display, such as one of the key components of a liquid crystal display (LCD) panel. Since the liquid crystal itself does not emit light, the function of the backlight module is sufficient supply. Brightness and evenly distributed light source, so that it can display images normally. With the improvement of liquid crystal display manufacturing technology, under the trend of the trend, the backlight module also needs to consider lightweight, thin and low-level, and become brightness and The market demand for cost reduction is an important issue for the development of new backlight modules and injection molding in the future. ^
習知提出-種液晶顯示器之背光模組的發光二極體陣列 端子的相關構造，如第-圖所示，主要構成元件有導光板 10'發光二極體陣列12、印刷電路板14、電極16、端子導 線18、端子尖端20等’利用端子尖端2〇與電極16的接觸， 將電力經由印刷電路板丨4上傳導到發光二極體陣列12上。 然於上述之結構中，若接觸的表面鏽蝕或是有粒子存在時會 有發生短路的疑慮。此外，於z軸方向空間（厚度） 上需有 一定空間容納可撓式之印刷電路板】4，如軟板（flexib丨e prim circuit，FPC)或捲帶載體構裝（tapecamerpackage TCp)， 因此厚度上不容易達到薄型化的要求。 5 另外，習知一種可撓性發光二極體背光電路"Flexible LED Backlighting Circuit”，如第二圖所示，利用軟板22之可 撓性特質，將發光二極體24利用表面封裝技術（surface mount technology, SMT)設置在軟板22上，並將軟板22上設置有 發光二極體24的三個側邊折彎九十度，由導光板端面入光。 然此種背光電路因軟板22的散熱性不佳，且因存在如此大的 軟板22面積，散熱效果更有大打折扣之疑慮，更甚者，軟板 22所需面積大，所需成本亦會增加。 【發明内容】 為了減少短路的問題產生’本發明的目的之一在於提供 一種背光源裝置。利用可撓性板將發光元件及基板結合在一 起，由基板之二端子部提供發光元件所需之電源，如此可避 免短路之虞，且不需外加電源。 本發明的目的之一在於提供一種背光源裝置，不需給予 一般可撓性板折彎的空間，因此使得模組厚度可薄型化。 為使得成本下降，本發明的目的之一在於提供一種背光 源裝置，利用可撓性板此種較為節省的材料，以降低成本， 並利用可撓性板達到較佳撓曲性的效果。 本發明的目的之一在於提供一種背光源裝置，其利用由 散熱性佳之基板所構成的印刷電路板設置於可撓性板上，用 以提高散熱效果，使得發光元件溫度降低。 為達到上述目的，本發明之一實施例提供一種背光源裝 置’包括：一基板，其具有二端子分別位於基板的兩側；一 導光板，其具有一入光面及一出光面’並位於基板下方；一 可撓性板，電性連接於基板的其中之一端子；一第一電路板， 6 電性連接於基板的另一端子；及一發光元件，設置於可撓性 板上，發光元件的一光源入射至導光板的入光面，並由導光 板的出光面出光。 【實施方式】 第三圖所示為本發明之一實施例所提出之背光源裝置之剖視示 意圖。背光源裝置之兩基板相對設置且液晶層（圖上未示）充填於其 中，於此實施例中，兩基板係為液晶顯示面板之玻璃面板28、30。於 實施例中，相較於玻璃面板28，例如一彩色滤片面板，玻璃面板 30，例如薄膜電晶體（thin film transistor，TFT)面板，由於尺寸較大’ 因此在玻璃面板30上可定義出二外露的端子部32、34位於玻璃面板 30的相反兩側。於此實施例中’一可撓性板42，例如一可撓式電路 板，電性連接於玻璃基板30的其中之一端子，例如端子部32 ;而一 第一電路板，例如帶狀載體(tape carrier)或可撓式電路板36，則電性 連接於玻璃基板30之另一端子，例如端子部34，則源極驅動IC與閘 極驅動ic設置於帶狀載體或可撓式印刷電路板36以電性連接玻璃面 板30。一導光板38，具有一入光面40及一出光面41，且導光板邛 設置於基板之下方，例如玻璃面板3〇下方，其中導光板38之用途係 將光源由其入光面40導至出光面41以提供其上之玻璃面板28、3〇 入射光源。接著，一發光元件44，設置於可撓性板42上，利用可撓 性板42可任意彎折之特性致使發光元件44的一光源入射至導光板邓 的入光面40,再由導光板38的出光面41出光。於此實施例中，在導 光板38上方更設有一光學模片，例如擴散板5〇，致使光源能均勻擴 散至玻璃面板28、30上。於一實施例中，可利用實裝技術，例如外 引腳接著技術(outer lead bounding, 0LB)，可將可撓性板42固定於端 子部32，而發光元件44，例如發光二極體，則利用表面黏著技術設 置於可梭性板42上，使得可撓性板42藉由端子部32電性連接至坡 璃面板30。根據上述’可撓性板42上發光元件私的驅動電路可設計 於可撓式電路板36上或其他地方，再藉由玻璃面板3〇上端子部％、 端子部34之電路紐光元件44所需魏，軸端子部32傳達，使得 發光兀件44可從玻璃面板3〇取得所需電源，如此不僅不會有短路之 虞，也可簡化背光模組設計。更甚者，利用可触板a電性連接與 固定發光元件44，可以降低製作成本。 第四圖為本發明之又-實補所提出之背絲裝置之剖視示意 圖。與第三圖之實施例相異之處在於發光元件66係電性連接於一^ 二電路板上’例如錄板64 基板上，再將第二電路板固定於 可繞性板62上。根據上述’發光元件66藉由第二電路板，例如紹基 板64 '可撓性板62、端子部32電性連接至玻璃面板3〇，致使發光元 件66可從玻璃面板30上之端子部32取得所需的電源，且發光元件 66可藉由由鋁基板66或是陶瓷基板等散熱性佳之材質所構成第二電 路板達到其散熱需求。於此實施例中，為增加背光源裝置的光學輝 度’更可於導光板38下方設置絲模片，例如反射板S2，將原本折 射出導光板38之未使㈣光源再时反射至導光板％，以提高畫面 亮度。根據本發明之精神所提出的縣源裝置，將發光元件利用表面 封裝技術實裝在可撓性板或電雜上，可撓絲或電路板利用實 裝技術1U定在捕面板上，而發光元件所需要的電源就玻璃面板 之端子部上的線路傳送，g)此不需要外加電源，可簡化模組設計。又， 藉由可撓性板可撓曲之雜’以齡额厚度，且可祕材料使用較 為節省’可大幅降低成本。再者，若將發光树設置於糊散熱性佳 之基板構成的印刷電路板上，能維持良好散熱功能，避免發光田 度過高。 m 以上所述之實施例僅為說明本發明之技術思想及特點，其目的在 使熟習此項技藝之人士能贿解本發gg之魄麟以實施，當不能以 之限定本發明之糊綱’即大凡依本㈣所揭示之精神所作之均等 變化或修飾，仍應涵蓋在本發明之專利範圍内。 1342443 【圖式簡單說明】 第一圖為習知之一液晶顯示器背光的發光二極體陣列端子的剖視示 意圖。 第二圖為習知之一可撓式發光二極體背光電路之俯視圖。 第三圖為本發明之一實施例背光源裝置之剖視示意圖。 第四圖為本發明之又一實施例背光源裝置之剖視示意圖。 【主要元件符號說明】 10,38 導光板 12 發光二極體陣列 14 印刷電路板 16 電極 18 端子導線 20 端子尖端 22 軟板 24 發光二極體 28,30 玻璃面板 32, 34 端子部 36 可挽式電路板 40 入光面 41 出光面 9 1342443 42, 62 可撓性板 44, 66 發光元件 50 擴散板 52 反射板A related structure of a light-emitting diode array terminal of a backlight module of a liquid crystal display is proposed. As shown in the first embodiment, the main constituent elements are a light guide plate 10', a light-emitting diode array 12, a printed circuit board 14, and an electrode. 16. The terminal lead 18, the terminal tip 20, and the like 'transmit the electric power to the light-emitting diode array 12 via the printed circuit board 4 by contact with the electrode 16 at the terminal tip 2'. However, in the above structure, if the surface to be contacted is rusted or there is a particle, there is a concern that a short circuit may occur. In addition, there is a certain space in the z-axis direction space (thickness) to accommodate a flexible printed circuit board]4, such as a flexib丨e prim circuit (FPC) or a tape carrier package (tapecamerpackage TCp). It is not easy to achieve the requirement of thinning in thickness. 5 In addition, a flexible LED backlight circuit [Flexible LED Backlighting Circuit" is known, as shown in the second figure, using the flexible characteristics of the flexible board 22, the surface of the LED 24 is encapsulated by surface technology. The surface mount technology (SMT) is disposed on the flexible board 22, and the three sides of the flexible board 22 on which the light-emitting diodes 24 are disposed are bent by ninety degrees, and the light is received from the end surface of the light guide plate. Because the heat dissipation of the flexible board 22 is not good, and because of the large area of the soft board 22, the heat dissipation effect is greatly reduced, and even more, the required area of the soft board 22 is large, and the required cost is also increased. SUMMARY OF THE INVENTION In order to reduce the problem of short circuit, one of the objects of the present invention is to provide a backlight device in which a light-emitting element and a substrate are bonded together by a flexible board, and a power supply for the light-emitting element is provided by two terminal portions of the substrate. Therefore, the short circuit can be avoided, and no external power supply is needed. One of the objects of the present invention is to provide a backlight device that does not need to give a space for bending a general flexible board, thereby making the module thickness adjustable. In order to reduce the cost, one of the objects of the present invention is to provide a backlight device that utilizes a relatively cost-effective material of a flexible board to reduce cost and utilize a flexible board to achieve better flexibility. [Effects of the Invention] An object of the present invention is to provide a backlight device which is provided on a flexible board by using a printed circuit board composed of a substrate having excellent heat dissipation for improving the heat dissipation effect and lowering the temperature of the light-emitting element. In an embodiment of the present invention, a backlight device includes: a substrate having two terminals on opposite sides of the substrate; a light guide plate having a light incident surface and a light exit surface and located under the substrate a flexible board electrically connected to one of the terminals of the substrate; a first circuit board, 6 electrically connected to the other terminal of the substrate; and a light emitting element disposed on the flexible board, the light emitting element A light source is incident on the light incident surface of the light guide plate, and is emitted from the light exit surface of the light guide plate. [Embodiment] FIG. 3 is a view showing an embodiment of the present invention. A schematic cross-sectional view of a backlight device in which two substrates of a backlight device are disposed opposite to each other and a liquid crystal layer (not shown) is filled therein. In this embodiment, the two substrates are glass panels 28 and 30 of a liquid crystal display panel. In the embodiment, compared to the glass panel 28, such as a color filter panel, the glass panel 30, such as a thin film transistor (TFT) panel, can be defined on the glass panel 30 due to its larger size. The exposed terminal portions 32, 34 are located on opposite sides of the glass panel 30. In this embodiment, a flexible board 42, such as a flexible circuit board, is electrically connected to one of the terminals of the glass substrate 30, For example, the terminal portion 32; and a first circuit board, such as a tape carrier or a flexible circuit board 36, is electrically connected to the other terminal of the glass substrate 30, such as the terminal portion 34, and the source is driven. The IC and the gate driver ic are disposed on the strip carrier or the flexible printed circuit board 36 to electrically connect the glass panel 30. A light guide plate 38 has a light incident surface 40 and a light exit surface 41, and the light guide plate is disposed under the substrate, for example, under the glass panel 3, wherein the light guide plate 38 is used to guide the light source from the light incident surface 40. To the light exit surface 41 to provide the glass panel 28, 3 〇 incident light source thereon. Then, a light-emitting element 44 is disposed on the flexible board 42. The light-emitting element 42 can be arbitrarily bent to cause a light source of the light-emitting element 44 to enter the light-incident surface 40 of the light guide plate Deng, and then the light guide plate. The light exit surface 41 of 38 is lighted out. In this embodiment, an optical film, such as a diffusion plate 5, is further disposed above the light guide plate 38, so that the light source can be uniformly diffused onto the glass panels 28, 30. In one embodiment, the flexible board 42 can be secured to the terminal portion 32 by a mounting technique, such as outer lead bounding (0LB), and the light emitting element 44, such as a light emitting diode, Then, the surface of the flexible plate 42 is electrically connected to the glass panel 30 by the terminal portion 32 by using a surface adhesion technique. According to the above description, the driving circuit for the light-emitting element on the flexible board 42 can be designed on the flexible circuit board 36 or elsewhere, and then the terminal portion of the glass panel 3 and the circuit light-emitting element 44 of the terminal portion 34 are provided. The required shaft and the terminal portion 32 are conveyed so that the light-emitting element 44 can obtain the required power from the glass panel 3, so that not only the short circuit but also the backlight module design can be simplified. Moreover, the electrical connection between the touch panel a and the fixed light-emitting element 44 can reduce the manufacturing cost. The fourth figure is a cross-sectional schematic view of the back wire device proposed by the present invention. The difference from the embodiment of the third figure is that the light-emitting element 66 is electrically connected to a circuit board such as a substrate 64, and the second circuit board is fixed to the flexible board 62. According to the above description, the light-emitting element 66 is electrically connected to the glass panel 3 by the second circuit board, for example, the substrate 64 'flexible board 62 and the terminal portion 32, so that the light-emitting element 66 can be removed from the terminal portion 32 of the glass panel 30. The required power supply is obtained, and the light-emitting element 66 can achieve the heat dissipation requirement by forming a second circuit board from a heat-dissipating material such as an aluminum substrate 66 or a ceramic substrate. In this embodiment, in order to increase the optical brightness of the backlight device, a wire die, such as a reflector S2, may be disposed under the light guide plate 38, and the light source 38 is originally refracted to reflect the (four) light source to the light guide plate. % to increase the brightness of the screen. According to the county source device proposed by the spirit of the present invention, the light-emitting element is mounted on the flexible board or the electric miscellaneous by using the surface encapsulation technology, and the flexible wire or the circuit board is fixed on the catching panel by using the mounting technology 1U, and the light is emitted. The power required by the component is transmitted on the line on the terminal of the glass panel. g) This does not require an external power supply, which simplifies the module design. Moreover, the flexibility can be greatly reduced by the flexibility of the flexible plate to the thickness of the age and the use of the secret material. Further, if the light-emitting tree is placed on a printed circuit board having a substrate having a good heat dissipation property, a good heat dissipation function can be maintained, and the light-emitting field can be prevented from being excessively high. The embodiments described above are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable a person skilled in the art to bribe the unicorn of the present invention, and the invention cannot be limited thereto. Equivalent changes or modifications made by the general public in accordance with the spirit disclosed in (4) shall remain within the scope of the patent of the present invention. 1342443 [Simple description of the drawings] The first figure is a schematic cross-sectional view of a light-emitting diode array terminal of a conventional liquid crystal display backlight. The second figure is a top view of a conventional flexible LED backlight circuit. The third figure is a schematic cross-sectional view of a backlight device according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a backlight device according to still another embodiment of the present invention. [Main component symbol description] 10,38 Light guide plate 12 Light-emitting diode array 14 Printed circuit board 16 Electrode 18 Terminal wire 20 Terminal tip 22 Flexible board 24 Light-emitting diode 28, 30 Glass panel 32, 34 Terminal part 36 Pullable Circuit board 40 light-incident surface 41 light-emitting surface 9 1342443 42, 62 flexible plate 44, 66 light-emitting element 50 diffuser plate 52 reflector