1333577 九、發明說明 【發明所屬之技術領域】 本發明是有關於一種用於背光模組之反射件。 【先前技術】 背光模組（Backlight module)係泛指可提供產品—個背 面光源的組件，目前運用在各種資訊、通訊、消費產品上， 如：液晶顯示器（Liquid Crystal Display，LCD )、底片掃描 器、幻燈片看片箱等產品。依照其光源入射位置的不同^ 光模組可分成側光式（edge lighting)與直下式（b〇tt〇m lighting)兩種。 • 側光式背光模組，通常是應用於例如手提型電腦等要求 .省電與輕薄之產品上。為了達到輕薄之要求，通常是於背光 模組的側邊放置光源，並藉由導光板（Light guide plate)，將 光源出射的光導引至顯示面板上。直下式背光模組，通常是 應用於例如電視等需具備高亮度之產品上。 I 第1圖係繪示一習用之直下式背光模組1〇〇的概略剖視 圖’其主要包含一外殼110用以支撐複數個燈管13〇以及— 擴散板140。該外殼110底部設有一白色擴散反射板12〇用 以將來自光源之光線反射到該擴散板14〇。 第2圖係繪不另一 S用之直下式背光模組200的概略剖 視圖《除了所使用之白色擴散反射板120具有複數個溝糟 222之外’背光模組200大致與第1圖之背光模組i 00相同。 前述習用之白色擴散反射板120 —般係以添加有無機 1333577 化合物粒子（例如二氧化鈦或硫酸鋇）122之聚合物基材製 成。擴散反射板雖可將光線擴散反射，然而無機化合物粒子 會吸收光而降低光使用效率，因此造成背光模組亮度不足的 問題。 X 、 【發明内容】 因此本發明的目的就是在提供一種用於背光模組之反 射件，其可克服或改善前述習用技術之問題。 為達上述及其他目的，本發明提出一種反射件，其具有 一金屬鏡面用以將來自光源之光線反射到該背光模組之光 照面，該金屬鏡面設有複數個溝槽。該反射件可以由一金屬 基材（例如銘板）形成，該金屬基材之表面形成一金屬鏡面。 此外’該反射件亦可以藉由將一金屬薄膜形成於一金屬或非 金屬基材而製得，在此實施例中，該金屬薄膜係在該基材上 形成一金屬鏡面。 本發明之反射件可以是設於背光模組的光源與外殼底 部之間的反射件或是具有金屬鏡面之背光模組外殼。因此， 當光源點亮時’直接進入擴散板之光線將與被反射件（或背 光模組之金屬鏡面）反射進入擴散板之光線混合，藉此形成 該擴散板之表面發光（surface luminance)，而在該擴散板之 表面形成一光照面（illuminating surface)。可以理解的是， 本發明反射件之金屬鏡面係可大幅增加反射率，進而有效改 善或解決習用背光模組免度不足之問題。此外，本發明之反 射件在金屬鏡面另形成複數個溝槽用以將光線擴散反射，以 6 1333577 獲付較佳之照度均勻性（illurninance uniformity ) ° 為達上述及其他目的，本發明另提供一種反射件，其金 屬鏡面設有複數個正對該些光源之溝槽。溝槽具有複數個凹 凸狀紋路’其分佈於每一該些溝槽之内側面。該些溝槽與凹 凸狀紋路係可有效增加光線的擴散反射，藉此獲得更佳之照 度均勻性。 【實施方式】 第3圖所示為根據本發明一實施例之背光模組3〇〇，其 包含一外殼310，用以支撐光源320、反射件330以及擴散 板340。外殼310之材質可以是塑化材料、金屬材料或其他 不透光材料用以防止光線洩漏。該光源32〇可以是冷陰極螢 光燈（cold cathode fluorescent lamp (CCFL))、熱陰極螢光燈 或發光二極體。該反射件330可以由一金屬基材（例如鋁板 或其他具有高反射率之金屬板）形成，該金屬基材之表面形 成一金屬鏡面330a°此外，該反射件330亦可以藉由將一 金屬薄膜（例如厚度為1〇〇奈米之鋁膜、銀膜或其他具有高 反射率之金屬膜或合金膜）形成於一金屬或非金屬基材而製 得，在此實施例中’該金屬薄膜係在該基材上形成一金屬鏡 面〇 如第3圖所示’該反射件3 30係設於光源320與外殼 3 10的底部之間。因此，當光源32〇點亮時，直接進入擴散 板340之光線將與被反射件33〇反射進入擴散板34〇之光線 混合’藉此形成該擴散板340之表面發光（surface 7 1333577 luminance)，而在該擴散板34〇之表面形成一光照面 ^ (illuminating surface)。可以理解的是，本發明反射件330 之金屬鏡面330a係可大幅增加反射件330之反射率，進而 提尚背光模組之亮度》如圖所示’本發明之反射件330在金 屬鏡面330a另形成複數個溝槽332用以將光線擴散反射， 以獲付較佳之照度均勻性（illuminance uniformity)。該些 溝槽332之剖面可以是半圓形、圓弧形（參見第3圖）、γ φ 字形（參見第4圖）或是類u字形（參見第8圖溝槽520 )。 此外’該些溝槽可以連續的方式排列（參見第3圖或第4 圖之溝槽332)或是不連續的方式排列（參見第7圖溝槽 510)。 第5圖所示為根據本發明另一實施例之背光模組400， 並且類似的元件係賦予相同的參考圖號。除了反射件33〇 在金屬鏡面330a另形成複數個溝槽410與凹凸狀紋路420 用以獲得更佳之照度均勻性之外，第5圖之背光模組400 _ 係與第3圖之背光模組3〇〇大致相同。如圖所示，該些溝槽 410係分別設在正對該些光源320之位置，該些凹凸狀紋路 420係分佈在該些溝槽4丨〇之内側面。該些溝槽4 10與該些 凹凸狀紋路420必須考慮光源320之間的間距以及光源320 與擴散板340之間的距離做設計。該些溝槽410之剖面可以 是半圓形、圓弧形（參見第5圖）、V字形（參見第6圖） 或是類U字形（參見第8圖溝槽520 )。此外，該些溝槽及 凹凸狀紋路可以連續的方式排列（參見第5圖或第6圖之凹 凸狀紋路420)或是不連續的方式排列（參見第7圖溝槽 8 1333577 510)。該些第一溝槽410與凹凸狀紋路420係可有效增加光 線的擴散反射，藉此獲得更佳之照度均勻性。 可以理解的是’根據本發明之背光模組亦可在外殼310 上直接形成一具有溝槽332或溝槽41〇、凹凸狀紋路420之 金屬鏡面，用以取代前述之反射件330。在此實施例中，外 殼310之材質較佳由一金屬基材（例如鋁板或其他具有高反 射率之金屬板）形成’該金屬基材之表面形成一金屬鏡面 33 0a。此外，該外殼3 10亦可以藉由將一金屬薄膜（例如厚 度為100奈米之鋁膜、銀膜或其他具有高反射率之金屬膜或 合金膜）形成於一金屬或非金屬基材而製得，在此實施例 中，該金屬薄膜係在該基材上形成一金屬鏡面。 本發明之反射件具有金屬鏡面而可大幅增加反射率，進 而提兩背光模組之亮度；此外’本發明之反射件在金屬鏡面 形成複數個溝槽用以將光線擴散反射，藉此獲得較佳之照度 均勻性（illuminance uniformity)。 雖然本發明已以實施例揭露如上，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圖係繪示習知之直下式背光模組的概略剖視圖。 第2圖係繪示另一習知之直下式背光模組的概略剖視 圖。 9 第3圖係繪示根據本發明一實施例之背光模組的概略 , 剖视圖。 〜 第4圖係繪示根據本發明另一實施例之背光模組的概 略剖視圖》 第5圖係繪示根據本發明另一實施例之背光模組的概 略剖視圖。 第6圖係繪示根據本發明另一實施例之背光模組的概 _ 略剖視圖。 第7圖係繪示根據本發明另一實施例之反射件的部分 剖視圖。 第8圖係繪示根據本發明另一實施例之反射件的部分 剖視圖。 【主要元件符號說明】 100 背光模組 110 外殼 120 反射片 122 無機化合物粒子 130 燈管 140 擴散板 200 背光模組 222 溝槽 300 背光模組 310 外殼 320 光源 330 反射 33〇a金屬鏡面 332 溝槽 340 擴散板 400 背光模組 410 溝槽 420 凹凸狀紋路 10 1333577 510 溝槽 520 溝槽1333577 IX. Description of the Invention [Technical Field] The present invention relates to a reflector for a backlight module. [Prior Art] Backlight module refers to a component that can provide a product as a back light source. It is currently used in various information, communication, and consumer products, such as liquid crystal display (LCD), film scanning. Products, slides, and other products. According to the difference of the incident position of the light source, the light module can be divided into two types: edge lighting and direct lighting (b〇tt〇m lighting). • Side-lit backlight modules are typically used in applications such as portable computers that save power and light weight. In order to achieve the requirements of lightness and thinness, a light source is usually placed on the side of the backlight module, and the light emitted from the light source is guided to the display panel by a light guide plate. Direct-lit backlight modules are commonly used in products that require high brightness, such as televisions. I Fig. 1 is a schematic cross-sectional view showing a conventional direct type backlight module 1', which mainly includes a casing 110 for supporting a plurality of lamps 13 and a diffusion plate 140. A white diffuse reflection plate 12 is disposed at the bottom of the outer casing 110 for reflecting light from the light source to the diffuser plate 14''. 2 is a schematic cross-sectional view of a direct-type backlight module 200 for use in another S. In addition to the white diffuse reflector 120 used, the backlight module 200 is substantially the same as the backlight of FIG. Module i 00 is the same. The conventional white diffuse reflection plate 120 is generally made of a polymer substrate to which inorganic 1333577 compound particles (e.g., titanium dioxide or barium sulfate) 122 are added. Although the diffuse reflection plate can diffuse and reflect light, the inorganic compound particles absorb light and reduce the light use efficiency, thereby causing a problem of insufficient brightness of the backlight module. X. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a reflector for a backlight module that overcomes or ameliorates the problems of the prior art. To achieve the above and other objects, the present invention provides a reflecting member having a metal mirror for reflecting light from a light source to a light surface of the backlight module, the metal mirror having a plurality of grooves. The reflecting member may be formed of a metal substrate (e.g., a nameplate) having a metal mirror surface formed on the surface thereof. Further, the reflecting member can also be formed by forming a metal film on a metal or non-metal substrate. In this embodiment, the metal film forms a metal mirror on the substrate. The reflecting member of the present invention may be a reflecting member disposed between the light source of the backlight module and the bottom of the casing or a backlight module casing having a metal mirror surface. Therefore, when the light source is lit, the light directly entering the diffusing plate will be mixed with the light reflected by the reflecting member (or the metal mirror surface of the backlight module) into the diffusing plate, thereby forming a surface luminance of the diffusing plate. An illuminating surface is formed on the surface of the diffusion plate. It can be understood that the metal mirror surface of the reflector of the present invention can greatly increase the reflectivity, thereby effectively improving or solving the problem of insufficient backlighting of the conventional backlight module. In addition, the reflector of the present invention further forms a plurality of grooves on the metal mirror surface for diffusing and reflecting the light, and the preferred illumination uniformity is obtained at 6 1333577. For the above and other purposes, the present invention further provides a trench. The reflector has a metal mirror surface with a plurality of grooves facing the light sources. The trench has a plurality of concave convex patterns ' distributed on the inner side of each of the trenches. The grooves and concave convex lines are effective for increasing the diffuse reflection of light, thereby achieving better illumination uniformity. Embodiment 3 FIG. 3 illustrates a backlight module 3A according to an embodiment of the present invention, which includes a housing 310 for supporting a light source 320, a reflector 330, and a diffusion plate 340. The material of the outer casing 310 may be a plasticized material, a metal material or other opaque material to prevent light leakage. The light source 32A may be a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp or a light emitting diode. The reflecting member 330 may be formed of a metal substrate (for example, an aluminum plate or other metal plate having high reflectivity), the surface of the metal substrate forming a metal mirror surface 330a. In addition, the reflecting member 330 may also be formed by a metal A film (for example, an aluminum film having a thickness of 1 nanometer, a silver film or other metal film or alloy film having high reflectivity) is formed on a metal or non-metal substrate, in this embodiment, the metal The film is formed on the substrate to form a metal mirror surface. As shown in FIG. 3, the reflector member 30 is disposed between the light source 320 and the bottom of the outer casing 315. Therefore, when the light source 32 is illuminated, the light directly entering the diffuser plate 340 will be mixed with the light reflected by the reflector 33 into the diffuser plate 34', thereby forming the surface of the diffuser 340 (surface 7 1333577 luminance) An illuminating surface is formed on the surface of the diffusion plate 34. It can be understood that the metal mirror 330a of the reflector 330 of the present invention can greatly increase the reflectivity of the reflector 330, thereby improving the brightness of the backlight module. As shown in the figure, the reflector 330 of the present invention is on the metal mirror 330a. A plurality of trenches 332 are formed for diffusely reflecting the light to obtain a preferred illuminance uniformity. The sections of the grooves 332 may be semicircular, circular (see Fig. 3), γ φ (see Fig. 4) or u-shaped (see Fig. 8 groove 520). Furthermore, the trenches may be arranged in a continuous manner (see trenches 332 of Figure 3 or Figure 4) or in a discontinuous manner (see trenches 510 of Figure 7). Fig. 5 shows a backlight module 400 according to another embodiment of the present invention, and like elements are given the same reference numerals. In addition to the reflector 33 另 forming a plurality of grooves 410 and embossed lines 420 on the metal mirror surface 330a for better illuminance uniformity, the backlight module 400 _ of FIG. 5 and the backlight module of FIG. 3 3〇〇 is roughly the same. As shown in the figure, the grooves 410 are respectively disposed at positions adjacent to the light sources 320, and the uneven lines 420 are distributed on the inner sides of the grooves 4''. The trenches 4 10 and the embossed lines 420 must be designed in consideration of the spacing between the light sources 320 and the distance between the light source 320 and the diffuser plate 340. The grooves 410 may have a semicircular, circular arc shape (see Fig. 5), a V shape (see Fig. 6) or a U-like shape (see the groove 520 of Fig. 8). In addition, the grooves and embossed lines may be arranged in a continuous manner (see the concave convex lines 420 of Fig. 5 or Fig. 6) or in a discontinuous manner (see the groove 8 1333577 510 of Fig. 7). The first trenches 410 and the embossed lines 420 are effective for increasing the diffuse reflection of the light, thereby achieving better illumination uniformity. It can be understood that the backlight module according to the present invention can also directly form a metal mirror surface having a groove 332 or a groove 41 〇 and a concave-convex pattern 420 on the outer casing 310 to replace the aforementioned reflection member 330. In this embodiment, the material of the outer casing 310 is preferably formed of a metal substrate (for example, an aluminum plate or other metal plate having high reflectivity). The surface of the metal substrate forms a metal mirror surface 330a. In addition, the outer casing 3 10 can also be formed on a metal or non-metal substrate by forming a metal film (for example, an aluminum film having a thickness of 100 nm, a silver film or other metal film or alloy film having high reflectivity). In this embodiment, the metal film forms a metal mirror on the substrate. The reflector of the invention has a metal mirror surface to greatly increase the reflectivity, thereby improving the brightness of the two backlight modules; furthermore, the reflector of the present invention forms a plurality of grooves on the metal mirror surface for diffusing and reflecting light, thereby obtaining a comparison Good illuminance uniformity. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and retouched without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a conventional direct type backlight module. Fig. 2 is a schematic cross-sectional view showing another conventional direct type backlight module. 9 is a schematic, cross-sectional view of a backlight module in accordance with an embodiment of the present invention. 4 is a schematic cross-sectional view of a backlight module according to another embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of a backlight module according to another embodiment of the present invention. Figure 6 is a schematic cross-sectional view showing a backlight module according to another embodiment of the present invention. Figure 7 is a partial cross-sectional view showing a reflecting member according to another embodiment of the present invention. Figure 8 is a partial cross-sectional view showing a reflecting member according to another embodiment of the present invention. [Main component symbol description] 100 backlight module 110 housing 120 reflective sheet 122 inorganic compound particles 130 lamp 140 diffuser 200 backlight module 222 trench 300 backlight module 310 housing 320 light source 330 reflection 33〇a metal mirror 332 groove 340 diffuser 400 backlight module 410 trench 420 concave and convex lines 10 1333577 510 trench 520 trench