201024853 九、發明說明： 【發明所屬之技術領域】 光模組 【先前技術】 液晶顯示ϋ (LCD)具有輕薄、大尺寸化、平面化及數位化等優 點，近年來需隸速增加。在傳献尺寸LCD f光模組巾光源多 採用冷陰極管（CCFL)燈管；隨著環保意識抬頭，LCD產品對高色 ❹彩品質、產品壽命等特性的需求，含汞成份之CCFL已逐漸被具省電、 環保、體積小、色純度高、堅固及壽命長之LED所取代。高功率哪 技術快速發展，LED發光效率未來預期可達12()丨m/w以上，並且， 因LED具有高純度的色彩性，將可大幅提升影像色彩的鮮能度，增加 色域範圍，顯不更多的色度和色調，以達到更細敏和更豐富之色彩表 現。 然而，由於LED屬於點光源特性，點光源會造成輝度（丨㈣丨咖⑻ 不均勻等問題。輝度係指光源體在某一方向上，每單位投影面積所發 出的光度。光度越高的光源體産生的輝度也越高，就越刺眼；輝度越 低的光源體，越不會産生強烈的直接眩光。如果LCD面板的輝度分佈 不均、經常變化，則使用者會發生視覺不舒適感及眼睛疲勞。所以， 為要使LED背光模組形成均句的面光源形態，在導光板上必須再做設 計。 舉例來說’如第1圖所示，美國專利第20070002563號揭示一種 直下式背光模組之導光溝槽（Light guide grooves in direct type backlight module) ’其直下式背光模組乃包含有反射罩i〇、複數光源 20、擴散板30、複數光學膜40與液晶面板50，並將複數導光溝槽 33設置於擴散板30的光入射面31與光出射面32，則光源20所發出 5 201024853 的光線在進入液晶面板50之前，可以藉由擴散板3〇的導光溝槽33 被擴散至少兩次，使得光線的分佈效果得以提高。實際上，從導光板 的厚度觀念而言，必須將導光板做的愈薄，才能得到更強的光線、獲 得更高輝度，但是，受到導光板成形技術的限制，要設計出上述具有 導光溝槽的結構且兼顧更薄、反射率更佳的導光板，可能還有許多的 瓶頸需要去克服。 【發明内容】 鑒於以上的問題，本發明的主要目的在於提供一種LED背光模 組，乃利用半穿透半反射膜的設計，來避免LED光源輝度太亮，造成 ❹LED f光模㈣度分佈不均的躲，從而可提升顯示面板的影像顯示 品質，並藉以大體上解決先前技術存在之缺失。 因此，為達上述目的，本發明所揭露之LED背光模組，其主要由 LED光源、半穿透半反射膜、導光板與反射底板所組裝而成，其中LED 光源上方係具有半穿透半反射膜，而導光板鄰接於半穿透半反射膜與 LED光源之至少一側，至於反射底板則裝設於LED光源以及導光板下 方。本發明所提供之數個實施例，係使用多個導光板與多片半穿透半 反射膜互相搭接的方式，或將導光板對應於LED光源上方處設置凹槽 以嵌入半穿透半反射膜的方式，讓LED光源所發出的部分光線可以經 ®由半穿透半反射膜的穿透功能再經導光板導出，其餘光線可以經由半 穿透半反射膜的反射功能打回反射底板再利用，因而，可以改善利用 LED光源作為背光源容易輝度太两與輝度分佈不均的問題。 本發明所提供之數個實施例’導光板更包含有擴散板與稜鏡片等 光學膜片部份’其製作上係可在導光板上方利用壓合或黏貼方式進行 組裝，或者可以和導光板以射出方式一體成型，用以藉由擴散板的均 光作用與稜鏡片的集光作，來提高LED光源的亮度與均齊度。 為使對本發明的目的、特徵及其功能有進一步的了解，茲配合圖 式詳細說明如下： 6 201024853 【實施方式】 請參照第2圖’係繪示本發明之一個實施例所提供之LED背光模 組的剖視囷。 LED背光模組主要是由複數個LED光源61、對應於LED光源 61的半穿透半反射膜62、導光板63與反射底板64所構成，而可作 為最上層液晶面板66之背光源。其中LED光源61上方係對應設置有 半穿透半反射膜62，而導光板63鄰接於半穿透半反射膜62與LED 光源61之一側，至於反射底板64則裝設於LED光源61以及導光板 63下方。本實施例將導光板63對應於LED光源61上方處設置凹槽 參以嵌入半穿透半反射膜62的方式，讓LED光源61所發出的部分光線 可以經由半穿透半反射膜62的穿透功能再經導光板63導出，其餘光 線可以經由半穿透半反射膜62的反射功能打回反射底板64再利用， . 藉以改善利用LED光源61作為背光源容易輝度太高與輝度分佈不均 , 的問題。以下配合囷式詳述之。 發光二極體（LED)光源61，具備亮度高及壽命長等特色，用以 發出光線，而作為液晶顯示器之背光模組，其可包含紅光（R)、綠光 (G)、藍光（B)或是白光（W)等各種顏色之發光二極體。半穿透 半反射膜62，其光穿透率較佳範圍係介於45%〜55%之間，貼附於 ® LED光源61上方，使LED光源61之所發出之光線部份反射、部份 透射。當然，LED光源61的數量並非僅限定於圏式中的數量，可依 照所需要液晶面板66之尺寸、亮度來加以調整。 導光板(light guide plate) 63分別鄰接並位於半穿透半反射膜62 與LED光源61之兩側，以及半穿透半反射膜62上方，換句話說，導 光板63形成一個罩體，底面具有凹槽，可以容置半穿透半反射膜62 與LED光源61，然後整體罩於半穿透半反射膜62與LED光源61上 方，而可位於半穿透半反射膜62與LED光源61之上方與兩側。 導光板63乃係應用於各種背光模組，是影響光效率的重要元件， 7 201024853 大致上乃是利用射出成型的方法將丙烯壓製成表面光滑的楔形板塊， 然後用具高反射率且不吸光的材料，在導光板63底面用網版印刷印上 圓形或方形的擴散點；其主要功能在於導引光線方向，以提高面板光 輝度及控制亮度均句。因此，藉由導光板63罩體的型態，用以導引 LED光源61所發出之光線直接穿透半穿透半反射膜62的部份，以及 由半穿透半反射膜62反射後，再反射底板64反射而穿過半穿透半反 射膜62之線作強度分佈後散出。 反射底板64位於整體結構之底部，除了供LED光源61以及導光 板63裝設外，也可將底面漏出的光反射回導光板63中，防止光線外 ❹漏’以增加光的使用效率；因此，反射底板64可將LED光源61受到 半穿透半反射膜62反射之光線，予以反射入半穿透半反射膜62或是 導光板63，而供再利用。 因此，藉由半穿透半反射膜62可以供LED光源61所發出之光線 部份反射、部份穿透，因此，僅有一部分的光線可以直接穿透，有效 解決因LED光源61輝度過亮’造成亮度不均、甚至可以直接看到led 光源61的問題，使光線分佈均句。 另外’導光板63上方可增設有擴散板(Diffuser)65，其功能為更 進一步提供更均勻的面光源，一般傳統的擴散膜主要是在擴散膜基材 ® 中，加入一顆顆的化學顆粒，作為散射粒子，而現有之擴散板其微粒 子分散在樹脂層之間，所以光線在經過擴散層時會不斷的在兩個折射 率相異的介質中穿過，在此同時光線就會發生許多折射、反射與散射 的現象，如此便造成了光學擴散的效果。或是使用全像技術，經由曝 光顯影等化學程序將毛玻璃的相位分部紀錄下來粗化擴散膜基材表 面，以散射模糊導光板上的墨點或線條。 另一方面，於擴散板65上方增加有稜鏡片，因光線自擴散板65 射出後其光的}曰向性較差，利用稜鏡片來修正光的方向，其原理藉由 光的折射與反射來達到凝聚光線、提高正面輝度的目的，以增加光線 8 201024853 自擴散板65射出後的使用效益，使能整體的背光模組的 60%-100%以上。其主糞w A -此, t ^ 肉 头王要以多疋酯（polyester)或聚碳酸酯 (polycarbonate)為材料’其表面結構一般為為稜形柱體或半圓柱體。 而其中導光板63、擴散板65與棱鏡片可為-趙成型，且導光板 63相對反射底板65之-側具有擴散紋路之表面，其採用射出成形； 或是導光板63内部係分佈有複數擴絲子，皆可進一步增加背光模組 之光線的均勻度，此些部份變化與進—步應用可輕料換變更，熟 悉此項技術之人士也可予以再設計，在此無法逐項羅列，但並 ^ 定於此些方式變化。 © 請參照第3圊，係緣示本發明所提供之LED背光模組的另一實施 例剖視圖。 導光板63與反射底板64除了第2圖的平板形外，亦可設計為如 圖中所繪示的楔形，而可減少整體LED背光模組的重量。 同時’每一個導光板63罩體形成之凹槽内的LED光源6彳亦可為 複數個（見第4 © ’如时騎示係為兩個），以達到各種規格的要求。 十實際實施於產品時，請參閱第5A圖〜第5C @，需要額外設計固 定元件68來加以結合導光板63與反射底板65，其可以採用各種卡 合'搭接、凹槽等方式來加以固定，此些固定方式係可以輕易變化， Φ無法--繚示列舉；再者，導光板的與半穿透半反射膜62的組合方 式，除了上述可以利用在導光板63上設置凹槽來嵌入半穿透半反射膜 62(可參考第5B圖與第5C圖）’還可以藉由多個導光板63與多片半 穿透半反射膜62互相搭接的方式（可參考第5A圖），相同的，因此 些組合方式可峰錢化，無法--♦示列舉，圖巾靖示僅為實施 態樣’並非用以限定本發明之範圍。 因此，藉由本發明所提供之LED背光模組，利用半穿透半反射膜 將LED光源的光線予以部份反射，而可降低最大輝度、解除影像太亮 的困擾，達到亮度、均勻性最佳的狀態。 9 201024853 雖然本發明以前述之實施例揭露如上， 明。在不脫離本發明之精神釦、、、其並非用以限定本發 •之申請 明之真利糾所為之更動細飾，均屬本發 保護範圍。關於本發明所界定之保護範圍請參考所附 【圖式簡單說明】 第1囷係先前技術之之示意圖； 第2圖係繪示本發明所提供之LED背光模_剖視圖； 第3圖係繚示本發明所提供之led背紐組的另—實施例剖視圖； 第4圖係繪示本發明所提供之LED背光模組的另一實施例剖視圓；以及 第5A圖〜第5C圖係繪示本發明所提供之LED背光模組的實施態樣 剖視圖。 ❹ 【主要元件符號說明】 10反射罩 20光源 30擴散板 31 光入射面 32光出射面 33光溝槽 40光學膜 50液晶面板 61 LED光源 62半穿透半反射膜 63導光板 64反射底板 65擴散板 66液晶面板 68固定元件201024853 Nine, invention description: [Technical field of invention] Optical module [Prior Art] Liquid crystal display (LCD) has advantages such as lightness, large size, planarization, and digitization, and has been increasing in speed in recent years. In the distribution of LCD f light module towel source, cold cathode tube (CCFL) lamp is used. With the awareness of environmental protection, LCD products have high-color enamel quality, product life and other characteristics, and the CCFL containing mercury has been used. It has gradually been replaced by LEDs that are energy-saving, environmentally friendly, small in size, high in color purity, strong and long-lived. High-power technology, rapid development, LED luminous efficiency is expected to reach 12 () 丨 m / w or more, and, because of the high purity of LED color, will greatly enhance the color of the image color, increase the color gamut range, No more chromaticity and hue to achieve more subtle and richer color performance. However, since the LED is a point source characteristic, the point source causes a problem of luminance (丨(四)丨(8) unevenness. The luminance refers to the luminosity emitted by the source body in a certain direction per unit of projected area. The higher the illuminance of the light source body The higher the brightness produced, the more dazzling; the lower the luminance, the less the direct glare will be produced. If the brightness of the LCD panel is unevenly distributed and changes frequently, the user may experience visual discomfort and eyes. Fatigue. Therefore, in order to make the LED backlight module form a uniform surface light source, it must be designed on the light guide plate. For example, as shown in Fig. 1, U.S. Patent No. 20070002563 discloses a direct type backlight module. "Light guide grooves in direct type backlight module", the direct type backlight module includes a reflection cover i, a plurality of light sources 20, a diffusion plate 30, a plurality of optical films 40 and a liquid crystal panel 50, and The plurality of light guiding grooves 33 are disposed on the light incident surface 31 and the light exit surface 32 of the diffusing plate 30, and the light emitted by the light source 20 5 201024853 can be borrowed before entering the liquid crystal panel 50. The light guiding groove 33 of the diffusing plate 3 is diffused at least twice, so that the distribution effect of the light is improved. In fact, from the viewpoint of the thickness of the light guide plate, the thinner the light guide plate must be made to be stronger. The light, to obtain higher brightness, but limited by the light guide plate forming technology, to design the above light guide groove structure and take into account the thinner, better reflectance of the light guide plate, there may be many bottlenecks need to go SUMMARY OF THE INVENTION In view of the above problems, the main object of the present invention is to provide an LED backlight module that utilizes a semi-transparent semi-reflective film design to prevent the LED light source from being too bright, resulting in a ❹LED f optical mode (four) degree distribution. Uneven hiding, which can improve the image display quality of the display panel, and substantially solve the problem of the prior art. Therefore, in order to achieve the above object, the LED backlight module disclosed by the present invention is mainly composed of an LED light source and a half. The semi-reflective film, the light guide plate and the reflective bottom plate are assembled, wherein the LED light source has a semi-transparent semi-reflective film above, and the light guide plate is adjacent to the semi-transparent film. At least one side of the semi-reflective film and the LED light source, and the reflective bottom plate is disposed under the LED light source and the light guide plate. Several embodiments provided by the present invention use a plurality of light guide plates and a plurality of semi-transparent semi-reflective films. The manner of overlapping with each other, or the light guide plate corresponding to the groove provided above the LED light source to embed the semi-transparent semi-reflective film, so that part of the light emitted by the LED light source can be worn by the semi-transparent semi-reflective film. The transmissive function is then led out through the light guide plate, and the remaining light can be returned to the reflective bottom plate through the reflection function of the semi-transparent semi-reflective film, thereby improving the problem that the LED light source is used as the backlight and the luminance is too low and the luminance distribution is uneven. The light guide plate of the present invention further includes an optical film portion such as a diffusion plate and a cymbal sheet, which can be assembled by pressing or pasting on the light guide plate, or can be combined with the light guide plate. The injection molding method is integrally formed to improve the brightness and uniformity of the LED light source by the uniform light action of the diffusion plate and the light collection of the cymbal. In order to further understand the objects, features and functions of the present invention, the following detailed description is given as follows: 6 201024853 [Embodiment] Please refer to FIG. 2 for illustrating an LED backlight provided by an embodiment of the present invention. The cross-section of the module. The LED backlight module is mainly composed of a plurality of LED light sources 61, a transflective film 62 corresponding to the LED light source 61, a light guide plate 63 and a reflective substrate 64, and can be used as a backlight of the uppermost liquid crystal panel 66. The LED light source 61 is disposed on the upper side of the LED light source 61, and the light guide plate 63 is adjacent to one side of the transflective film 62 and the LED light source 61. The reflective bottom plate 64 is disposed on the LED light source 61. Below the light guide plate 63. In this embodiment, the light guide plate 63 is disposed corresponding to the recessed portion of the LED light source 61 so as to be embedded in the semi-transparent semi-reflective film 62, so that part of the light emitted by the LED light source 61 can pass through the semi-transparent semi-reflective film 62. The transmissive function is further led out through the light guide plate 63, and the remaining light can be returned to the reflective bottom plate 64 through the reflection function of the semi-transmissive semi-reflective film 62, thereby improving the use of the LED light source 61 as a backlight, and the luminance is too high and the luminance distribution is uneven. , The problem. The following is a detailed description of the formula. The light-emitting diode (LED) light source 61 has the characteristics of high brightness and long life for emitting light, and as a backlight module of the liquid crystal display, it can include red (R), green (G), and blue light ( B) Light-emitting diodes of various colors such as white light (W). The transflective film 62 preferably has a light transmittance of between 45% and 55%, and is attached to the LED light source 61 to partially reflect the light emitted by the LED light source 61. Transmission. Of course, the number of the LED light sources 61 is not limited to the number in the cymbal type, and can be adjusted according to the size and brightness of the liquid crystal panel 66 required. Light guide plates 63 are respectively adjacent to and located on both sides of the transflective film 62 and the LED light source 61, and above the transflective film 62. In other words, the light guide plate 63 forms a cover, the bottom surface. The recessed surface can accommodate the transflective film 62 and the LED light source 61, and then is entirely over the transflective film 62 and the LED light source 61, and can be located at the semi-transparent semi-reflective film 62 and the LED light source 61. Above and on both sides. The light guide plate 63 is applied to various backlight modules and is an important component affecting light efficiency. 7 201024853 is generally a method of injection molding to compress propylene into a wedge-shaped plate having a smooth surface, and then having high reflectivity and no light absorption. The material is printed with a circular or square diffusion point on the bottom surface of the light guide plate 63 by screen printing; its main function is to guide the light direction to improve the brightness of the panel and control the brightness. Therefore, the shape of the cover of the light guide plate 63 is used to guide the light emitted by the LED light source 61 to directly penetrate the portion of the semi-transparent semi-reflective film 62, and is reflected by the transflective film 62. The reflection substrate 64 is reflected and passed through the line of the semi-transparent semi-reflective film 62 as an intensity distribution and then dissipated. The reflective bottom plate 64 is located at the bottom of the overall structure. In addition to the LED light source 61 and the light guide plate 63, the light leaked from the bottom surface can be reflected back into the light guide plate 63 to prevent leakage of light to increase the efficiency of light use. The reflective bottom plate 64 can reflect the LED light source 61 with the light reflected by the semi-transparent semi-reflective film 62 into the transflective film 62 or the light guide plate 63 for reuse. Therefore, the light emitted by the LED light source 61 can be partially reflected and partially penetrated by the semi-transmissive semi-reflective film 62. Therefore, only a part of the light can be directly penetrated, thereby effectively solving the problem that the LED light source 61 is too bright. 'Causes uneven brightness, and can even directly see the problem of led light source 61, so that the light distribution is uniform. In addition, a diffusion plate (Diffuser) 65 may be added above the light guide plate 63, and the function thereof is to further provide a more uniform surface light source. Generally, the conventional diffusion film is mainly used in the diffusion film substrate®, and a chemical particle is added. As the scattering particles, the existing diffusion plate has fine particles dispersed between the resin layers, so the light will continuously pass through the two different refractive index media when passing through the diffusion layer, and at the same time, the light will occur many times. The phenomenon of refraction, reflection and scattering thus causes the effect of optical diffusion. Or use the holographic technique to record the phase fraction of the frosted glass through a chemical process such as exposure development to roughen the surface of the diffusion film substrate to scatter the dots or lines on the fuzzy light guide plate. On the other hand, a cymbal is added above the diffusing plate 65. Since the light is emitted from the diffusing plate 65, the light is poorly deflected, and the cymbal is used to correct the direction of the light. The principle is by the refraction and reflection of light. To achieve the purpose of condensing light and improving frontal brightness, to increase the use efficiency of light 8 201024853 after self-diffusion plate 65, 60%-100% of the overall backlight module is enabled. Its main dung w A - this, t ^ meat head king should be made of polyester or polycarbonate as its surface structure is generally a prismatic cylinder or a semi-cylindrical body. The light guide plate 63, the diffuser plate 65 and the prism sheet may be formed by a shape of a light, and the surface of the light guide plate 63 having a diffusion pattern on the side opposite to the reflective bottom plate 65 may be formed by injection molding; or the light guide plate 63 may have a plurality of internal distributions. The addition of the wire can further increase the uniformity of the light of the backlight module. These partial changes and the further application can be changed by light materials. Those who are familiar with the technology can also redesign. Listed, but will be changed in these ways. © Please refer to Section 3 for a cross-sectional view showing another embodiment of the LED backlight module provided by the present invention. In addition to the flat shape of Fig. 2, the light guide plate 63 and the reflective bottom plate 64 can also be designed as a wedge shape as shown in the figure, thereby reducing the weight of the overall LED backlight module. At the same time, the number of LED light sources 6 凹槽 in the recess formed by the cover of each of the light guide plates 63 can also be plural (see the fourth © ‘the time riding system is two) to meet various specifications. When it is actually implemented in the product, please refer to FIG. 5A to 5C @, and an additional design of the fixing member 68 is required to combine the light guide plate 63 and the reflective bottom plate 65, which can be applied by various engaging 'laps, grooves, etc. Fixed, the fixing manners can be easily changed, Φ can not be-showed; further, the combination of the light guide plate and the semi-transparent semi-reflective film 62, in addition to the above, can be used to provide a groove on the light guide plate 63. The embedded transflective film 62 (refer to FIGS. 5B and 5C) can also be overlapped by a plurality of light guide plates 63 and a plurality of semi-transparent semi-reflective films 62 (refer to FIG. 5A). It is the same, and therefore, the combination is not limited to the scope of the present invention. Therefore, with the LED backlight module provided by the present invention, the light of the LED light source is partially reflected by the semi-transparent semi-reflective film, thereby reducing the maximum luminance and eliminating the problem that the image is too bright, and achieving the best brightness and uniformity. status. 9 201024853 Although the invention has been disclosed above in the foregoing embodiments. It is within the scope of this invention to modify the details of the invention without departing from the spirit and scope of the present invention. For the protection scope defined by the present invention, please refer to the attached [Simplified Description of the Drawings]. FIG. 1 is a schematic diagram of the prior art; FIG. 2 is a cross-sectional view of the LED backlight module provided by the present invention; FIG. 4 is a cross-sectional view showing another embodiment of the LED backlight module provided by the present invention; and FIG. 4 is a cross-sectional view showing another embodiment of the LED backlight module provided by the present invention; and FIG. 5A to FIG. 5C A cross-sectional view of an embodiment of an LED backlight module provided by the present invention is shown. ❹ [Main component symbol description] 10 reflector cover 20 light source 30 diffuser plate 31 light incident surface 32 light exit surface 33 light groove 40 optical film 50 liquid crystal panel 61 LED light source 62 semi-transparent semi-reflective film 63 light guide plate 64 reflective bottom plate 65 Diffuser plate 66 liquid crystal panel 68 fixing component