1294057 玖、發明說明 【發明所屬之技術領域】 本發明係有關於一種面光源入光裝置，特別是有關於適 用於大功率發光二極體之面光源入光裝置。 【先前技術】 面光源入光裝置泛指可提供產品一個面光源的裝置，目 刖廣泛運用在各種資訊、通訊、消費（3C)產品上，例如液晶 顯示器（Liquid Crystal Disply ; LCD)、底片掃描器、幻燈片 投影機等產品。其中以作為LCD之光源組件之背光模組 (Backlight Module)為最大宗的市場，亦為其重要零組件。 近年來隨著LCD顯示器產業的蓬勃發展，背光模組之市場 也因而快速成長，成為上下游零組件產業中備受矚目的產品 — 0 背光模組的操作原理，簡言之，係利用自發性的背光 源，經由導光板（Light Guiding Plate)將光線導引成平面光 源，以確保面板亮度的均勻性。有時為了產生一些特殊的光 學特性，可在導光板上加上一些特殊的光學膜，或者導光板 上設計特殊的結構圖案以便進一步處理光源。由於背光源係 依序排列於導光板下方，當背光模組之厚度越薄時，背光源 的輪廓就越容易在例如LCD畫面上造成輝度不均與陰影。 藉由設置擴散板（Diffuser)或是調整擴散板的形狀，將透過 導光板的光線做散射處理，設法消除背光源的陰影並使晝面 的輝度更均勻。至於背板則作為反射板（Re^ect〇r)之用，可 1294057 防止:光源發射的光線外漏，並提昇光的使用效率。 背光模組常用的背光源例如有冷陰極螢光燈（c〇id cath〇deFlorescent Lamp ; ccfl)、發光二極體㈨咖 Di〇de ; LED)與電激發光⑻⑽⑹㈣刚“⑽ 等。雖然目前以冷陰極螢光燈為主流，然而對發光二極體的 需求卻與日增加。發光二極體是由半導體材料所製成之發光 元件，元件具有兩個電極端子，在端子間施加電壓，通入極 小的電流，經由電子電洞之結合可將剩餘能量以光的形式激 發釋出由於發光一極體具有體積小、壽命長、低驅動電壓、 1電量低、耐震性佳等優點。除此之外，採用發光二極體之 背光源可提供比冷陰極螢光燈更豐富的色階，使得lcd影 像色度更為飽和同時更為逼真。其次，採用發光二極體之背 光源可降低顯示器厚度。例如，在丨8英寸的LCD模組中， 採用一個4至6毫米（mm)厚的發光二極體背光模組便可替 代傳統的8至12mm厚的冷陰極螢光燈的背光模組。再者， 發光二極體產品的生命周期約為5萬小時，更為持久耐用。 而且發光二極體不含水銀，十分環保。基於上述諸多優勢， 發光二極體儼然成為背光源中後起之秀。 然而，習知面光源入光裝置存在許多問題。例如，請參 閱弟1圖’為繪示習知面光源入光裝置的剖面圖，此習知面 光源入光裝置100至少包含導光板101以及複數個點光源 103，其中點光源103為發光二極體。導光板101為透明且 至少包含相互平行之入光面1〇5與出光面106。一般而言， 點光源103係貼近設於入光面丨〇5且位於導光板1 〇 i至少 1294057 一侧之下方，其中光源發射出之光線i 〇7經過導光板1 〇 i 而自出光面106射出以提供面光源。 在第1圖中，由於點光源103之光源發散角不足，在點 光源103之間於導光板1 〇丨近入光面i〇5之一側會產生暗 帶109,使得導光板1〇1無法有效提供最大發光面積。縱使 將點光源103稍加遠離導光板ι〇1可克服此問題，然而會 使得面光源入光裝置之輝度衰減，在目前對光源亮度之嚴峻 要求下，以尺寸及光輸出功率均較小之發光二極體作為點光 源顯然已不敷使用。 請參照第2圖，其係繪示另一習知面光源入光裝置的剖 面圖。此習知面光源入光裝置丨1〇係利用複數個光輸出功率 較大之點光源11 3取代第1圖中之點光源1 〇3，以改善面光 源入光裝置之輝度不足的缺點。點光源丨丨3亦貼近設於入光 面105，其中光源發射出之光線117經過導光板ι〇1而自 出光面106射出以提供面光源。 然而在第1圖中，由於光輸出功率較大之點光源n 3 的尺寸較大，加上光源發散角亦不足，因此在點光源i i 3 之間於導光板101近入光面1〇5之一側會仍會產生暗帶 119，使得導光板1〇1無法有效提供最大發光面積。 因此有必要提供一種面光源入光裝置，以於同時點亮多 個發光二極體時，提供更均勻且穩定亮度，並改善習知面光 源入光裝置因發光二極體之光源發散角不足所造成之暗帶 現象。 1294057 於點光源213,藉以消除點光源213之間的暗帶。舉例而言， 點光源211之操作電流可不超過300毫安培。在另一個例子 中’點光源21 3之間更可設有二個或二個以上點光源211， 以消除點光源2 1 3之間的暗帶。 此處值得一提的是，上述點光源2丨丨與點光源2丨3之尺 寸及光輸出功率大小不限，舉凡利用尺寸不同或光輸出功率 不同之發光二極體作為點光源時，皆可適用於本發明。由於 本發明之面光源入光裝置利用尺寸不同之發光二極體，因此 可有效解決習知面光源入光裝置因發光二極體之光源發散 角不足所造成之暗帶現象，並可擴大導光板之有效發光區。 由上述本發明較佳實施例可知，應用本發明之面光源入 光裝置，其優點在於利用尺寸不同之發光二極體貼近設於 導光板，其中大尺寸之發光二極體彼此之間設有至少一個 小尺寸之發光二極體，藉以改善習知面光源入光裝置因發光 二極體之光源發散角不足所造成之暗帶現象。 雖然本發明已以較佳實施例揭露如上，然其並非用以限 定本發明，任何熟習此技藝者，在不脫離本發明之精神和範 圍内，當可作各種之更動與潤飾，因此本發明之保護範圍當 視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 第1圖係繪示習知面光源入光裝置的剖面圖； 第2圖係繪示另一習知面光源入光裝置的剖面圖；以及 第3圖係繪示根據本發明一較佳實施例之面光源入光 1294057 裝置的剖面圖。 【元件代表符號簡單說明】 100 :面光源入光裝置 101 103 :點光源 105 106 :出光面 107 109 :暗帶 110 11 3 :點光源 117 119 :暗帶 200 :面光源入光裝置 201 205 :入光面 206 211 :點光源 213 21 7 :光線 導光板 入光面 光線 面光源入光裝置 光線 _ :導光板 :出光面 :點光源BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source light-injecting device, and more particularly to a surface light source light-incorporating device suitable for a high-power light-emitting diode. [Prior Art] The surface light source is a device that can provide a surface light source for products. It is widely used in various information, communication, and consumer (3C) products, such as liquid crystal display (LCD), film scanning. Products, slide projectors and other products. Among them, the backlight module (Backlight Module), which is a light source component of the LCD, is the largest market and an important component. In recent years, with the vigorous development of the LCD display industry, the market for backlight modules has grown rapidly, becoming a high-profile product in the upstream and downstream component industry. The operating principle of the 0 backlight module, in short, the use of spontaneity The backlight is guided by a Light Guiding Plate into a planar light source to ensure uniform brightness of the panel. Sometimes, in order to produce some special optical characteristics, special optical films may be added to the light guide plate, or a special structural pattern may be designed on the light guide plate to further process the light source. Since the backlights are sequentially arranged under the light guide plate, the thinner the thickness of the backlight module, the more easily the outline of the backlight causes unevenness and shadow on the LCD screen. By providing a diffuser or adjusting the shape of the diffuser, the light transmitted through the light guide is scattered to try to eliminate the shadow of the backlight and make the brightness of the face more uniform. As for the back plate, it is used as a reflector (Re^ect〇r), which can prevent the light emitted by the light source from leaking out and improve the efficiency of light use. Backlights commonly used in backlight modules are, for example, cold cathode fluorescent lamps (c〇id cath〇deFlorescent Lamp; ccfl), light-emitting diodes (9) coffee Di〇de; LED) and electroluminescent light (8) (10) (6) (four) just "(10), etc. Although currently The cold cathode fluorescent lamp is the mainstream, but the demand for the light emitting diode is increasing day by day. The light emitting diode is a light emitting element made of a semiconductor material, the element has two electrode terminals, and a voltage is applied between the terminals. The introduction of a very small current, through the combination of electronic holes, can release the remaining energy in the form of light. The light-emitting one has the advantages of small volume, long life, low driving voltage, low power, and good shock resistance. In addition, the backlight of the LED can provide a richer color gradation than the cold cathode fluorescent lamp, making the lcd image more saturated and more realistic. Secondly, the backlight of the LED can be used. Reduce the thickness of the display. For example, in a 英寸8-inch LCD module, a 4 to 6 mm thick LED backlight module can replace the traditional 8 to 12 mm thick cold cathode fluorescent lamp. Backlight In addition, the life cycle of the LED products is about 50,000 hours, which is more durable. Moreover, the LEDs are not mercury-containing and very environmentally friendly. Based on the above advantages, the LEDs become the backlight. However, there are many problems with the conventional surface light source light-emitting device. For example, please refer to the figure 1 for a schematic view of a conventional surface light source light-input device, which is known to include at least a light guide plate. The point source 103 is a light emitting diode. The light guide plate 101 is transparent and includes at least a light incident surface 1〇5 and a light exit surface 106. Generally, the point light source 103 is closely attached. The light incident surface 丨〇5 is located below the light guide plate 1 〇i at least 1294057 side, wherein the light emitted from the light source i 〇7 passes through the light guide plate 1 〇i and is emitted from the light exit surface 106 to provide a surface light source. In the figure, since the light source divergence angle of the point light source 103 is insufficient, a dark band 109 is generated between the point light source 103 on one side of the light guide plate 1 near the light incident surface i〇5, so that the light guide plate 1〇1 cannot be effectively provided. Maximum illumination Even if the point source 103 is slightly away from the light guide plate ι〇1, the problem can be overcome, but the brightness of the surface light source entering the light device is attenuated. Under the severe requirements of the brightness of the light source, the size and the light output power are compared. The small light-emitting diode is obviously not suitable as a point light source. Please refer to Fig. 2, which is a cross-sectional view showing another conventional surface light source light-input device. The point source 1 3 in Fig. 1 is replaced by a plurality of point sources 11 3 having a large optical output power to improve the lack of brightness of the surface light source. The point source 丨丨3 is also disposed close to the light incident surface. 105, wherein the light 117 emitted by the light source is emitted from the light exit surface 106 through the light guide plate ι 1 to provide a surface light source. However, in FIG. 1 , since the size of the point source n 3 having a large optical output power is large, and the divergence angle of the light source is also insufficient, the light guide plate 101 is close to the light surface 1〇5 between the point light sources ii 3 . One side will still produce a dark band 119, so that the light guide plate 1〇1 cannot effectively provide the maximum light-emitting area. Therefore, it is necessary to provide a surface light source into the light device to provide more uniform and stable brightness when simultaneously illuminating a plurality of light emitting diodes, and to improve the light source divergence angle of the light source of the conventional light source. The dark band phenomenon caused. 1294057 is applied to the point source 213 to eliminate the dark band between the point sources 213. For example, the operating current of the point source 211 may not exceed 300 milliamperes. In another example, two or more point sources 211 may be provided between the point sources 21 3 to eliminate dark bands between the point sources 2 1 3 . It is worth mentioning here that the size of the point light source 2 丨丨 and the point light source 2 丨 3 and the size of the light output power are not limited, and when the light-emitting diodes having different sizes or different light output powers are used as the point light source, It can be applied to the present invention. Since the surface light source light-input device of the present invention utilizes light-emitting diodes having different sizes, it can effectively solve the dark band phenomenon caused by the insufficient light-emitting angle of the light source of the light-emitting diode of the conventional surface light source light-incident device, and can expand the guide The effective illumination area of the light panel. According to the preferred embodiment of the present invention, the surface light source device of the present invention has the advantage that the light-emitting diodes of different sizes are closely disposed on the light guide plate, wherein the large-sized light-emitting diodes are disposed between each other. At least one small-sized light-emitting diode is used to improve the dark band phenomenon caused by insufficient light source divergence angle of the light-emitting diode of the conventional surface light source. While the present invention has been described above by way of a preferred embodiment, it is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional surface light source light-incident device; FIG. 2 is a cross-sectional view showing another conventional surface light source light-in device; and FIG. 3 is a view showing A cross-sectional view of a surface light source incorporating light 1294057 in accordance with a preferred embodiment of the present invention. [Simplified description of component representative symbols] 100: surface light source entering device 101 103: point source 105 106: light emitting surface 107 109: dark band 110 11 3 : point light source 117 119: dark band 200: surface light source entering device 201 205: Light-incident surface 206 211: Point light source 213 21 7 : Light-guide plate into the light surface Light surface light source into the light device _: Light guide plate: Light-emitting surface: Point light source
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