200823556 九、發明說明 ................一一娜細:沙觸《獅纏 【發明所屬之技術領域】 本發明是有關於一種直下式發光二極體（Light Emitting Diode ; LED)背光模組，且特別是有關於一種運用 具有圓錐形凹槽的透明板之直下式LED背光模組。 【先前技術】 背光模組主要做為液晶顯示器的光源提供者，由於液晶 本身並不具舍光性，因此需藉申背光模組提供光源。背光模 組依光源位置可分成側光式與直下式兩種，前者主要應用於 監視器與筆記型電腦等之中小型面板，後I主要應用於液晶 電視等之大型面板。在傳統大型背光模組中，光源多採用冷 陰極螢光 ik 管（Cold Cathode Fluorescent Lamp ; CCFL)。然 L年來由於環保忍識抬頭，具省電、環保、體積小、色 、、屯度咼堅固及壽命長等優點之發光二極體（LED)可望在不 久將來逐漸取代含汞成分之CCFL。 清參照第1圖，其係根據習知技術所繪示的一種直下式 led月光模組之剖面示意圖。大體而言，lED直下式背光 模組1 〇〇 —般係由複數個LED光源i 〇丨，設置於LED光源 101上方之擴散板120以及設置於擴散板120上方之光學膜 片130所組成。在此直下式[ED背光模組1 〇〇外更可設有 塑膠框件或鐵件（圖未繪示），以用來容置彼些LED光源 101、擴散板120及光學膜片130。 上述之LED光源1 〇 1 一般係以矩陣或其他排列方式設 200823556 、:&板1〇2上’其中底板1〇2可例如印刷電路板，使 光源101電性連接至底板1〇2。然而，由於LED光源⑻ 受到封裝結構的影響，所提供的光線1〇3多為軸向光，因此 運用在背光模組時容易造成紅、、綠、藍三色混光不均的現 象。為了改善此一現象，在彳量混光效果與封裝成本下，一 般常採用三合一（3-in-i)LED晶粒的封裝方式，即將三原色 之紅（R)光LED晶粒、綠（G)光LED晶粒與藍（B)光led晶 _粒封裝在同一載體上，進而形成三合—LED光源，以解決 RGB三色混光距離較長的問題；然而受限於led為點光 源，即使已混合成白光，其光強度仍然不均，必須增加模組 厚度才能解決，這使得LED直下式背光模組1〇〇的厚度無 法減少，難以符合輕薄短小的設計需求。另一種解決方式係 藉由增加LED光源的數量來提高亮度以增進混光效果；不 過LED光源的數量增加後，成本過高，難為市場接受。此 外又種解决方式係藉由增加擴散板1 2 0霧度以增進混光 效果；不過此舉會造成LED直下式背光模組1〇〇的輝度下 【發明内容】 有鑑於此，本發明的觀點之一是在提供一種直下式發光 二極體（LED)背光模組，此直下式！^£0背光模組至少包含複 數個LED光源、透明板及擴散板，其中上述之透明板係設 於彼些LED光源及擴散板之間。透明板具有互相平行之入 光面及出光面，其中入光面係面對於彼些led光源之面。 200823556 此透明板之出光μ古/ 之入射弁綠I 個圓錐形凹槽，使得光源 、-！過此些圓錐形凹槽 反射#右八、Η 1 a T J ；^此透明板中產生全 板之出光效果，谁而拇曰甘之出先面射出，藉以增進透明 又禾進而提昇其出光效率。 本發明的另一觀點是田 模組之ϋ明&甘〆 種用於直下式LED背光 入# ;总二w 千仃之入光面及出光面，其中 光面係面對於複數個LED水 吸双似先源。此透明执 複數個圓錐形凹槽，使 乃板之出先面叹有 錐开,⑷士 光源之入射光線經過此些圓 錐幵/凹槽a守，可於此透明板中 2 自卜、十、夕山丄 &乃板中產生全反射並充分混光後，再 自上述之出光面射出，藉以增進 昇其出光效率。 边月扳之出先效果’進而提 根據本發明之上述顴點 士 义蜆…占如出一稜直下式LED背光模 、、且，至少包含··複數個LED光 兀碌叹置於此些LED光源上 方之透明板以及設置於透明板上 ψ ^ ^ ^ ^ 汉上万之擴政板，其中透明板之 出先面係设有預設凹角之圓錐形凹槽，藉以使每一咖光 源之產生入射光線經過此圓錐形凹槽時’於透明板中產生全 反射後再自上述之出光面射出。詳言之，透明板具有互相平 行之入光面及出光面，其中入光面係面對於彼此led光 源。每- LED光源產生之入射光線於上方之出光面定義出 一出光區’其中此出光區係設有預設凹角之圓錐形凹槽。 led光源之入射光線經過此些圓錐形凹槽時，可於透明板 中產生全反射並充分混光後，再自上述之出光面射出。 依照本發明一較佳實施例，上述預設凹角之角度一般以 介於80。至135。之間為較佳。 7 200823556 依照本發明一較佳實施例，上述之入光面及/或出光面 可為平滑面、粗糙面或設有複數個導光圖案，其中此些導光 圖案可例如複數個V型微溝槽。 根據本發明之其他觀點，提出一種用於直下式LED背 光模組之透明板，其中此透明板之出光面係設有預設凹角之 圓錐形凹槽，藉以使每- LED光源產生之入射光線經過此 圓錐形凹槽時，於此透明板中產生全反射後再自上述之出光 _面射出。詳言之，透明板具有互相平行之入光面及出光面， 其中入光面係面對於彼些LED光源。每一 LED光源產生之 入射光線於上方之出光面定義出—出光區，其中此出光區係 設有預設凹角之圓錐形凹槽。LED光源之入射光線經過此 些圓錐形凹槽時，可於此透明板中產生全反射並充分混光 後’再自上述之出光面射出。 應用上述之直下式led背光模組時，由於此直下式 LED背光模組係於LED光源及擴散板之㈣置透明板，且 _此透明板之出光面係設有預設凹角之圓錐形凹槽，藉以使每 一 LED光源之入射光線經過此圓錐形凹槽時產生全反射， 可於此透明板中產生全反射並充分混光後，再自上述之出光 面射出’以增進透明板之出光效果，進而提昇其出光效率。 如此纟，可大幅提昇LED光源之混光效果，解決習知直 下式LED背光模組的明暗不均及輝度不足等問題。 【實施方式】 本t明的目的就是在提供一種直下式led背光模組， 200823556 以解決習知直下式LED背光模組的明暗不均及輝度不足等 問題。為了使本發明之特徵與技術優勢能有更清楚的呈現， 以下係舉數個直下式LED背光模組作為較佳實施例來加以 詳細說明。 請參照第2A圖，其係根據本發明較佳實施例所繪示之 直下式LED月光模組的剖面示意圖。此直下式背光模 組200至少包含複數個LED光源2〇1、設置於led光源2〇1 上方之透明板210以及設置於透明板21〇上方之擴散板 22〇其巾透明板21 〇之出光φ 2! 3係設有f員設凹角〆之圓 錐形凹槽215，藉以使每一 LED光源2G1之入射光線2〇3 、、二過此圓錐形凹槽21 5時，於此透明板2〗〇中產生全反射後 再自上述之出光面213射出。 申言之，彼些LED光源201之型式不拘，然以三合一 LED光源為較佳。一般而t，彼^ LED光源、201可例如以 “陣方式叹於底板202上，然本發明不限於此，上述[ΕΙ) 光源201亦可以其他排列方式設於底板202上，其中底板 2〇2可例如印刷電路板，使led光源训電性連接至底板 202 〇 一200823556 IX. Invention description...................一一娜细:沙触"Ling wrap [Technical field of invention] The present invention relates to a direct type light emitting diode (Light Emitting Diode; LED) backlight module, and in particular, a direct-lit LED backlight module using a transparent plate having a conical groove. [Prior Art] The backlight module is mainly used as a light source provider for liquid crystal displays. Since the liquid crystal itself is not light-receiving, it is necessary to provide a light source by using a backlight module. The backlight module can be divided into two types: sidelight type and direct type according to the position of the light source. The former is mainly applied to small and medium panels such as monitors and notebook computers, and the latter is mainly applied to large panels such as liquid crystal televisions. In the traditional large-scale backlight module, the cold cathode fluoresced fluorescent tube (CCFL) is often used as the light source. However, in the past few years, due to the environmental protection, the light-emitting diodes (LEDs) with the advantages of energy saving, environmental protection, small size, color, strongness, long life and long life are expected to gradually replace the CCFL containing mercury components in the near future. . Referring to FIG. 1 , it is a schematic cross-sectional view of a direct type led moonlight module according to the prior art. In general, the lED direct-lit backlight module 1 is generally composed of a plurality of LED light sources i, a diffusion plate 120 disposed above the LED light source 101, and an optical film 130 disposed above the diffusion plate 120. In this direct type, the ED backlight module 1 can be provided with a plastic frame member or a metal member (not shown) for accommodating the LED light source 101, the diffusion plate 120 and the optical film 130. The above-mentioned LED light source 1 〇 1 is generally provided in a matrix or other arrangement. 200823556,: & plate 1〇2, where the substrate 1〇2 can be printed, for example, to electrically connect the light source 101 to the substrate 1〇2. However, since the LED light source (8) is affected by the package structure, most of the light provided by the LED light source (8) is axial light, so that when the backlight module is used, the red, green, and blue colors are unevenly mixed. In order to improve this phenomenon, in the case of the mixed light mixing effect and the package cost, a three-in-one (3-in-i) LED die is generally used, that is, a red (R) light LED die of three primary colors, green (G) The light LED die and the blue (B) light led crystal _ grain are packaged on the same carrier to form a triple-LED light source to solve the problem of long RGB three-color mixed light distance; however, it is limited by led The point light source, even if it has been mixed into white light, its light intensity is still uneven, and the thickness of the module must be increased to solve the problem. This makes the thickness of the LED direct type backlight module 1 无法 can not be reduced, and it is difficult to meet the design requirements of light, thin and short. Another solution is to increase the brightness of the LED light source to increase the light mixing effect; however, after the number of LED light sources increases, the cost is too high and it is difficult for the market to accept. In addition, the solution is to increase the light mixing effect by increasing the haze of the diffusion plate 120; however, this will result in the brightness of the LED direct-lit backlight module 1 发明 [Invention] In view of this, the present invention One of the ideas is to provide a direct-lit LED backlight module, which is straight down! The backlight module includes at least a plurality of LED light sources, a transparent plate and a diffusing plate, wherein the transparent plate is disposed between the LED light sources and the diffusing plate. The transparent plate has a light-incident surface and a light-emitting surface which are parallel to each other, wherein the light-incident surface is opposite to the surface of the led light source. 200823556 The light of the transparent plate is μ Gu / the incident 弁 green I conical groove, so that the light source, -! Through these conical grooves, reflection #右八, Η 1 a T J ; ^ This transparent plate produces the light effect of the whole plate, who will shoot out the first face to enhance the transparency and enhance the light extraction efficiency. Another aspect of the present invention is that the field module's ϋ明& 〆 〆 〆 用于 用于 用于 用于 用于 用于 ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Suction is like a source. This transparently holds a plurality of conical grooves, so that the first surface of the plate is slanted with a cone, and (4) the incident light of the light source passes through the conical ridges/grooves, which can be used in the transparent plate. Xishan 丄 & is the total reflection in the plate and fully mixed, and then emitted from the above-mentioned light surface, in order to enhance the light efficiency. The effect of the edge of the moon is further improved, and the above-mentioned 士 士 蚬 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占 占a transparent plate above the light source and a magnifying plate disposed on the transparent plate ψ ^ ^ ^ ^, wherein the transparent plate has a conical groove with a preset concave angle, so that each coffee source is generated. When the incident light passes through the conical groove, it generates total reflection in the transparent plate and then exits from the above-mentioned light-emitting surface. In particular, the transparent plate has mutually incident light-emitting surfaces and light-emitting surfaces, wherein the light-incident surface is for each other to light the light source. Each of the incident light rays generated by the LED light source defines an exit region on the upper exit surface, wherein the exit region is provided with a conical recess having a predetermined concave angle. When the incident light of the led light source passes through the conical grooves, it can be totally reflected in the transparent plate and fully mixed, and then emitted from the light emitting surface. In accordance with a preferred embodiment of the present invention, the angle of the predetermined concave angle is generally between 80. To 135. It is better between. According to a preferred embodiment of the present invention, the light-incident surface and/or the light-emitting surface may be a smooth surface, a rough surface or a plurality of light guiding patterns, wherein the light guiding patterns may be, for example, a plurality of V-shaped micro-patterns. Groove. According to another aspect of the present invention, a transparent plate for a direct-lit LED backlight module is provided, wherein a light-emitting surface of the transparent plate is provided with a conical groove having a preset concave angle, thereby causing incident light generated by each LED light source. When passing through the conical groove, total reflection occurs in the transparent plate, and then the light is emitted from the surface. In detail, the transparent plate has mutually parallel entrance and exit surfaces, wherein the entrance surface is for the LED light sources. The incident light generated by each of the LED light sources defines an exit region on the upper exit surface, wherein the exit region is provided with a conical recess having a predetermined concave angle. When the incident light of the LED light source passes through the conical grooves, it can be totally reflected in the transparent plate and fully mixed, and then emitted from the light exit surface. When the above-mentioned direct-type LED backlight module is applied, the direct-lit LED backlight module is disposed on the (four) transparent plate of the LED light source and the diffusion plate, and the light-emitting surface of the transparent plate is provided with a conical recess with a preset concave angle. a groove, whereby the incident light of each LED light source is totally reflected when passing through the conical groove, and the total reflection is generated in the transparent plate and fully mixed, and then the light exit surface is emitted to enhance the transparent plate. The light-emitting effect enhances the light-emitting efficiency. In this way, the light-mixing effect of the LED light source can be greatly improved, and the problem of uneven brightness and insufficient brightness of the conventional direct-lit LED backlight module can be solved. [Embodiment] The purpose of the present invention is to provide a direct-lit LED backlight module, 200823556, to solve the problem of uneven brightness and insufficient brightness of the conventional direct-lit LED backlight module. In order to provide a clearer representation of the features and technical advantages of the present invention, several direct-lit LED backlight modules are described in detail below as preferred embodiments. Please refer to FIG. 2A, which is a cross-sectional view of a direct-lit LED moonlight module according to a preferred embodiment of the present invention. The direct-lit backlight module 200 includes at least a plurality of LED light sources 2, a transparent plate 210 disposed above the LED light source 2〇1, and a diffusing plate 22 disposed above the transparent plate 21〇, and a transparent plate 21 of the towel. The φ 2! 3 system is provided with a conical groove 215 having a concave corner ,, so that the incident light ray 2 〇 3 of each LED light source 2G1 and the second conical groove 21 5 are formed on the transparent plate 2 〖The total reflection is generated in the 〇 and then emitted from the above-mentioned light-emitting surface 213. In other words, the types of LED light sources 201 are not limited, but a three-in-one LED light source is preferred. Generally, the LED light source 201 can be sighed on the bottom plate 202 in an array manner. However, the present invention is not limited thereto, and the above-mentioned [ΕΙ] light source 201 can also be disposed on the bottom plate 202 in other arrangements, wherein the bottom plate 2〇 2 can be, for example, a printed circuit board, so that the led light source is electrically connected to the bottom plate 202.
取—透月板2丨〇之材質可例如壓克力材料、聚碳酸酯材料、 =苯乙烯材料或環烯烴聚合材料，其係具有互相平行之入光 面211及出光面213，其中入光面211係面對於彼些lED 、原j〇1 般而言’透明板210係利用凸設於底板202上 之支撐結構（未綠示）而架設於彼些LED光源201之上方， 、、〜、擴政板220相距一預設高度H，其中此預設高度η係 200823556 以介於0至200毫米（mm)之間為較佳。 請同時參照第2A圖及第2B圖，其中第2B圖係根據第 2A圖之區域240所繪示之局部放大圖。每一 LED光源201 產生之入射光線203於上方之出光面213定義出一出光區 214 ’其中此出光區214係設有預設凹角（9之圓錐形凹槽 215。圓錐形凹槽215之預設凹角0的角度一般以例如介於 80。至135。之間為較佳。由於圓錐形凹槽215係用以使lED 光源201產生之入射光線2〇3於透明板21〇内產生全反射， 故此圓錐形凹槽215之深度D係取決於LED光源201之型 式及其與透明板210之間的距離d，本發明無意限定此深度 D。實乃因本發明所屬技術領域中具有通常知識者應可了 解’當LED光源201與透明板210之間的距離d愈大，則 深度D亦愈大；反之亦然，故此處不另贅述，任何能使入 射光線產生全反射之圓錐形凹槽的設計，均不脫離本發明之 精神和範圍。LED光源201之入射光線2〇3經過上述之圓 錐形凹槽215時，可於透明板21G中產生全反射並充分混光 j，再自上述之出光面213射出，因此可減少直下式咖 背光模纽200所需之T f盾，Π1 #窃 ^ 而之LED先源201數x，更可縮短混光距 離。 在本發明-較佳實施例中，上述之入光面2ιι及/或出 二面213可為平滑面。然而，在另一較佳實施例中，入光面 及/或出光面213可選擇性設有經切製程形成粗链面 ^繪不）’明進透明板21G之出光效果，進而提昇盆出 先效率。請參照圖至第2以，其係根據本發明; 200823556 車父佳貫施例所緣示之透明板的局部立體示意圖。在本發明又 一較佳實施例中，上述之入光面211及/或出光面213更可 分別選擇性設有複數個導光圖案。此些導光圖案分布於整個 入光面211及/或出光面213，而適合之導光圖案可例如複 數個V型（V-Cut)微溝槽217或印刷網點等，然本發明不限 於此。上述導光圖案可經由例如v型（v_Cut)刮刀、微影蝕 刻、雷射切削或印刷等方式製作。以v型微溝槽217為例， 此些V型微溝槽217可只設於出光面213(如第2C圖所示）、 ，、ax於入光面211 (如第2D圖所示）、相互交錯設於出光面 213一(如第2E圖所示）、相互交錯設於入光面2ιι(如第2f圖 所不）、或上下交錯分別設於入光面211及出光面213(如第 2G圖所不）。上述v型微溝槽217可於透明板21〇之製程中 :體士型而製得，或於透明板21〇之表面上經由再加工製 得’藉此可大幅提升直下式LED背光模組2〇〇之輝度，減 少光學膜片230的使用，更可有效的降低生產成本。 請參照2H圖，JL将撫嫌势门 口 -係根據弟2Ε圖所繪示之透明板的局 :_不思“。以上述之V型微溝槽217為例，可利用例 上二刮#刀二影#刻或雷射切削等方式，在透明板210 v型微、羞結構極微小、類似於稜鏡且呈連續均勻分布之 ^槽217。這些以微溝槽217為例之導光 有效棱幵出光效率。舉 ^ T 上 J而5，在本發明的一個例子中，合 先源20H系以矩陣方式排列時，此二 型微溝槽217即以十字$4 二V先Θ木例如v 十子又錯方式設置，正如第2E圖至第2G 圖所不。然而在其他例子中 ^ 2〇 田LED光源2〇1係以蜂巢狀 11 200823556 排列時，此些導光圖案則彼此約呈60。角交錯方式設置（圖 未繪示）。 值得一提的是，本發明透明板210表面的粗糙面及/或 導光圖案係使透明板210内全反射光從透明板21〇之出光面 21 3經由擴散板220及光學膜片230射出，藉此增進透明板 210之出光效果，進而提昇其出光效率。此外，透明板21〇 的厚度越薄，透明板210内入射光線2〇3的反射次數越多， _相對的從透明板210之出光面2 1 3射出的光線也越強。易言 之，利用本發明之透明板210進行混光，取代傳統直下式背 光模組以較大之混光距離進行混光的方式，可大幅縮減直下 式LED背光模組200的整體厚度。 在實施時，本發明之直下式LED背光模組2〇〇除了上 述70件外，在擴散板220上方更至少包含一光學膜片23〇， 如第2A圖之所示，其中此光學膜片23〇可運用習知之各種 光學膜片，以調整此直下式！^ED背光模組2〇〇之光學表現。 馨再者此直下式LED背光模組200亦可視需求再設有塑膠 框件或鐵件（圖未繪示），以用來容置上述LED光源2〇ι、透 明板210、擴散板220及光學膜片230。 、由以上本發明數個較佳實施例可知，應用本發明之直下 式LED背光模組時，其優點在於此直下式led背光模組係 於LED光源及擴散板之間設置透明板，且此透明板之出光 面係設有預設凹角之圓錐形凹槽，藉以使每一 LED光源之 =射光線經過此圓錐形凹槽時，可於此透明板中產生全反射 並充刀此光後，再自上述之出光面射出，以增進透明板之出 12 200823556 光效果，進而提昇立屮伞The material of the moon plate 2 can be, for example, an acrylic material, a polycarbonate material, a styrene material or a cycloolefin polymer material, which has a light-incident surface 211 and a light-emitting surface 213 which are parallel to each other. The surface 211 is the same as the lED and the original j〇1. The transparent plate 210 is mounted above the LED light sources 201 by a support structure (not shown) protruding from the bottom plate 202. The expansion board 220 is spaced apart from a predetermined height H, wherein the preset height η is 200823556 preferably between 0 and 200 millimeters (mm). Please refer to FIG. 2A and FIG. 2B at the same time, wherein FIG. 2B is a partially enlarged view according to the area 240 of FIG. 2A. Each of the incident light rays 203 generated by the LED light source 201 defines an exit region 214 ′ in the upper light exit surface 213. The light exit region 214 is provided with a preset concave angle (a conical recess 215 of 9). It is preferable to set the angle of the concave corner 0 to be, for example, between 80 and 135. Since the conical groove 215 is used to cause the incident light ray 2 〇 3 generated by the lED light source 201 to generate total reflection in the transparent plate 21 〇 Therefore, the depth D of the conical groove 215 depends on the type of the LED light source 201 and its distance d from the transparent plate 210, and the present invention is not intended to limit the depth D. It is a common knowledge in the technical field to which the present invention pertains. It should be understood that 'the greater the distance d between the LED light source 201 and the transparent plate 210, the greater the depth D is; and vice versa, so no further details here, any conical recesses that can cause total reflection of the incident light. The design of the groove does not deviate from the spirit and scope of the present invention. When the incident light ray 3 of the LED light source 201 passes through the conical groove 215 described above, total reflection can be generated in the transparent plate 21G and fully mixed, and then The above-mentioned light-emitting surface 213 is emitted, so The Tf shield required for the direct type coffee backlight module 200 is reduced, and the LED source 201 number x is used to shorten the light mixing distance. In the preferred embodiment of the present invention, the above-mentioned light entrance surface The two sides 213 may be smooth surfaces. However, in another preferred embodiment, the light incident surface and/or the light exit surface 213 may be selectively provided with a cut process to form a thick chain surface. The light-emitting effect of the transparent plate 21G is enhanced, and the efficiency of the basin is improved. Please refer to the figure to the second, which is a partial perspective view of the transparent plate according to the present invention; In another preferred embodiment of the present invention, the light incident surface 211 and/or the light exit surface 213 may be selectively provided with a plurality of light guiding patterns. The light guiding patterns are distributed over the entire light incident surface 211 and/or the light exit surface 213, and suitable light guiding patterns may be, for example, a plurality of V-cut micro-trench 217 or printed dots, etc., but the invention is not limited thereto. this. The above light guiding pattern can be produced by, for example, a v-type (v_Cut) doctor blade, microetching, laser cutting or printing. Taking the v-type micro-trench 217 as an example, the V-type micro-grooves 217 may be disposed only on the light-emitting surface 213 (as shown in FIG. 2C), and ax on the light-incident surface 211 (as shown in FIG. 2D). Interlaced on the light-emitting surface 213 (as shown in FIG. 2E), interlaced on the light-incident surface 2 ιι (not shown in FIG. 2f), or vertically staggered on the light-incident surface 211 and the light-emitting surface 213 ( As shown in Figure 2G). The v-type micro-groove 217 can be made in the process of the transparent plate 21〇: a body type, or can be obtained by reworking on the surface of the transparent plate 21〇, thereby greatly improving the direct-type LED backlight module. The brightness of 2〇〇 reduces the use of the optical film 230, and can effectively reduce the production cost. Please refer to the 2H map, JL will be slammed into the door of the door - according to the transparent board of the brother 2: _ do not think. Take the above-mentioned V-shaped micro-trench 217 as an example, you can use the example of the second scrape # In the transparent plate 210 v type, the structure is extremely small, similar to 稜鏡 and is continuously and evenly distributed. The grooves 217 are used as examples. The effective prismatic light-emitting efficiency is as follows: in an example of the present invention, when the precursor source 20H is arranged in a matrix, the two-type micro-groove 217 is a cross $4, a second V first eucalyptus, for example. v Ten children are set in the wrong way, as shown in Figures 2E to 2G. However, in other examples, when the LED light source 2〇1 is arranged in a honeycomb shape 11 200823556, the light guiding patterns are adjacent to each other. It is set at 60. The angle is staggered (not shown). It is worth mentioning that the rough surface and/or the light guiding pattern on the surface of the transparent plate 210 of the present invention causes the totally reflected light in the transparent plate 210 to be reflected from the transparent plate 21 The light-emitting surface 21 3 is emitted through the diffusion plate 220 and the optical film 230, thereby enhancing the light-emitting effect of the transparent plate 210, thereby improving In addition, the thinner the thickness of the transparent plate 21〇, the more the number of reflections of the incident light 2〇3 in the transparent plate 210, and the stronger the light emitted from the light-emitting surface 2 1 3 of the transparent plate 210 is. In other words, by using the transparent plate 210 of the present invention to perform light mixing, the conventional direct-lit backlight module can be used to reduce the overall thickness of the direct-lit LED backlight module 200 by replacing the light mixing mode with a large mixed light distance. The direct-type LED backlight module 2 of the present invention comprises at least one optical film 23〇 above the diffusion plate 220, as shown in FIG. 2A, wherein the optical film 23〇 Various optical diaphragms can be used to adjust the optical performance of this direct-type ED backlight module. The sleek LED backlight module 200 can also be equipped with plastic frame or iron parts. (not shown) for accommodating the LED light source 2, the transparent plate 210, the diffusion plate 220, and the optical film 230. As can be seen from the above several preferred embodiments of the present invention, the application of the present invention is straight down. LED backlight module, its advantages are straight The LED backlight module is provided with a transparent plate between the LED light source and the diffusing plate, and the light emitting surface of the transparent plate is provided with a conical groove with a preset concave angle, so that each LED light source passes through the cone. When the groove is formed, the total reflection can be generated in the transparent plate and the light is filled, and then emitted from the light emitting surface to enhance the light effect of the transparent plate 12 200823556, thereby raising the vertical umbrella
光泝之、、曰m 1 率。如此一來，可大幅提昇LED 的 先效果，解決習知直下式led背光模組的明暗不 均或輝度不足等問題。 ^暗不 定本^本Γ明已以較佳實施例揭露如上，然其並非用以限 本表明’本發明所屬技術領域中任何具有通常知識者，在 發明之精:和範圍内，當可作各種之更動與潤飾 為準《月之m圍當視後附之中請專利範®所界定者 【圖式簡單說明】 本發明的較佳實施例已於前載之說明文字列 圖式作更詳細的闡述，其中： 稀以下列 ^第1圖係根據習知技術所繪示的一種直下式LED此光 模組之剖面示意圖； 北、第2 A圖係根據本發明較佺實施例所繪示之直下式led 月光模組的剖面示意圖； 第2B圖係根據第2A圖之區域24〇所繪示之局部放大 圖； 較佳實施例 第2C圖至第2G圖，其係根據本發明又一 斤、9示之透明板的局部立體示意圖；以及 圖 第2H圖係根據第2E圖所繪示之透明板的局部立體示 主要元件符號說明】 13 200823556 100 ·· LED 直 下 式 背 光模 組 101 :LED 光源 102 :底板 103 :光線 120 •擴散板 130 :光學 膜片 200 :LED 直 下 式 背 光模 組 201 ：LED 光源 202 :底板 203 :入射 光線 210 :透明板 211 :入光 面 213 :出光面 214 :出光 區 215 :圓錐形 凹 槽 217 :V型 微溝槽 220 :擴散板 230 :光學 膜片 240 :區域 D ： 深度 d ： 距離 Η : 預設高度 Θ ： 預設 凹角 14Light traces, 曰m 1 rate. In this way, the first effect of the LED can be greatly improved, and the problem of uneven brightness or insufficient brightness of the conventional direct-lit LED backlight module can be solved. The present invention has been disclosed in the above preferred embodiments, and it is not intended to limit the invention to any of ordinary skill in the art to which the invention pertains. All kinds of changes and retouchings are subject to the definition of "Payment of the Moon", and the preferred embodiment of the present invention has been described in the preceding paragraph. Detailed description, wherein: the following is a cross-sectional view of a direct-type LED according to the prior art; the north and the second A are drawn according to the embodiment of the present invention. FIG. 2B is a partial enlarged view of the area 24 根据 according to FIG. 2A; FIG. 2C to FIG. 2G are preferred embodiments according to the present invention. A partial perspective view of a transparent plate of one kilogram and nine; and a partial perspective view of a transparent plate of the transparent plate shown in FIG. 2E according to the second component diagram. 13 200823556 100 ·· LED direct backlight module 101 :LED light source 102: bottom plate 103 Light ray 120 • Diffuser plate 130: Optical film 200: LED Direct type backlight module 201: LED light source 202: Base plate 203: Incident light 210: Transparent plate 211: Light-incident surface 213: Light-emitting surface 214: Light-emitting area 215: Cone Shape groove 217: V-shaped micro groove 220: diffusion plate 230: optical film 240: area D: depth d: distance Η: preset height Θ : preset concave angle 14