200825551 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種背光模組，尤其涉及一種應用於液晶 顯示裝置的背光模組。 【先前技術】 近幾年來，隨著便檇式電話、便檇式資訊終端等小型 便檇式終端設備的顯示器件的發展，小型、輕便且功耗低 的液晶顯示裝置被廣泛應用。液晶顯示裝置最主要的部件 係液晶顯示板，液晶顯示板包括設置於其背面侧的輔助照 明裝置，即背光模組，及設置於其前面側的輔助照明裝置， 即前光源模組。 發光二極體（Light Emitting Diode，簡稱 LED)由於 具有壽命長、節能、環保以及尺寸小等優點，被越來越多 地作為光源應用於液晶顯示裝置的背光模組中。由於LED 尺寸較小，於背光模組的設計過程中被視為點光源。 請參閱圖1A與圖1B，先前的背光模組10包括一個導 光板（Light Guide Plate，簡稱 LGP) 14 與一個 LED 光源 12。導光板14主要包括入光面142、出光面、反射面 I46與幾個側面（未標出）。導光板14的作用係將led光 源12發出的點光源轉換成從導光板14出光面144發出的 面光源。為提高導光板14出射光的效率與均勻性，可於反 射面設置多種微結構162。微結構162設置於以LED光源 12為圓心的同心圓弧上。LED光源12射出的光線，幾乎垂 直地入射於微結構162上，因此，可藉由微結構162避免 6 200825551 光線外向擴散而衰減，從而提高LED^12由點光源 光源的轉換效率。 、°面 惟’ LED發光部分的面積雖然較小，仍有_定的幾^ 尺寸，於-些精度要求較高或系統本身尺寸較小的應用^ 合中’ LED的尺寸會對系統光學性能，例如：光出射效率野 光出射均勻性產生影響。 有鐾於此，提供一種具有更高的光出射效率、更高的 光出射均勻性的背光模組實爲必要。 〇 【發明内容】 一種背光模組，其包括至少—個統及__ 該導光板包括-人絲，—與該人絲相㈣出光面，及 -與出光面相對的反射面，該反射面上設置複_結構， 該光源包括—發絲正料光板的人絲。賴數微結構 刀U於以《光面上的複數點為圓心的複數組同心圓弧 上。 該光源係發光二極體。 、該光源發光面上進—步包括複數等分線將發光面等 如，上述的複數點分別分佈於發光面的不同等分線上。 分佈於同-圓弧上的微結構的間距相同。 不同組同心㈣的交又點僅設置—個微結構。 上述微結構距離入光面越遠，其尺寸越大。 上述微結構距離入光面越遠，其排列密度越大。 上述微結構為凹入或凸出結構。 上述微結構為散射點或散射溝槽。 7 200825551 上述微結構的剖面形狀包括矩形、方形、多邊形、橢 圓形、二角形、菱形或金字塔形。 該導光板的入光面設置於導光板的一側面或導光板的 一角。 與先前技術相比，於該背光模組中，導光板上的微結 構係設置于以同一光源發光面上的複數點為圓心的複數組 同心圓弧上。故，於光源數目不增加及導光板的微結構數 目基本不變的情況下，該背光模組可具有更高的光出射效 率及光出射均勻性。 【實施方式】 下面將結合附圖對本發明實施例作進一步的詳細說 明。 …請參閱圖2A與圖2B，本發明第一實施例提供一種背 光松組20，其包括一個光源22、-個導光板24。該導光 板24包括一入光面242,一與入光面242相鄰的出光面244 及:與該出光面244相對的反射面246,其中該反射面246 上叹置有複數第一微結構262及第二微結構脳。該光源 22設置於入光面242的一侧，該光源&進一步包括一發 光面222與導光板24的入光面242相對。本實施例中，該 光源22為發光二極體（LED)。 匕該V光板24係用透明材料，如丙烯酸樹脂、聚碳酸 酉日承乙稀樹脂或玻璃等製成。光線從光源22的發光面 222射出，經入光面242進入導光板24中，一部分光線直 接從出光* 244出射，另-部分光線於導光板24内按照全 8 200825551 反射原則傳播，經反射面246上的微結構邡2、264反射後， 由出光面244射出。 睛一併參閱圖3，光源22的發光面222上可進一步包 括兩條垂直於導光板24的反射面246的等分線224、226 將光源22的發光面222分成三等份。設置於反射面246上 的第一微結構262分佈於以等分線224上任一點為圓心的 複數組同心圓弧上，第二微結構264分饰於以等分線⑽ 上任-點為圓心的複數組同心圓弧上。該第一微結構脱 及第二微結構264可為凹入或凸出的結構。優選地，該第 -微結構262及第二微結構264可為散射點或散射溝槽， 該第-微結構262及第二微結構264的剖面可為矩形、方 形、多邊形、橢圓形、三角形、菱形或金字塔形等。 進一步地，為提咼光線出射的均勻性，分佈於同一圓 弧上的第-微結構262或第二微結構264之間應具有相同 的間距。3，可通過分別調整分佈於不同組的圓弧上的第 -微結構262或第二微結構264之間的間距，以減少第一 微結構262與第二微結構之間的重疊，使得本實施例 導光板24可避免由於第一微結構262與第二微結構脱之 間的重疊導致出光不均勻的現象。另，於第—微結構脱 與第二微結構264之間的交疊處可僅設置一個第—微鲈構 262或第二微結構264。 本領域技術人員應明白，本實施例中，分佈於不同組 圓弧上的第一微結構262及第二微結構264的分伟密度及 尺寸可改變反射面246局部區域的散射能力。通常，微垆 200825551 構=分麵度及尺寸越大，其散射能力越強。因此，為避 、光板24上郇近光源22的區域過亮，而遠離光源&的 區域過暗，本實施例中第—微結構262及第二微結構· 的分佈密度及尺寸可隨雜絲22的麟的增加而增加。 另，為提高光出射的效率，反射面2仙上可設置一增 反膜（未示出），其為金屬膜或者介質膜，如鋁膜、銀膜等曰。 該增反膜可進—步提高反射面246及第-微結構262與第 二微結構264的反射率，另，導光板24除人光面242 ^的 三個侧面，也可通過鍍增反膜來提高反射專。 月多閱圖4，本發明苐二實施例提供一種背光模組 3〇，其包括一個光源32、一個導光板34。該導光板如包 括入光面342，一與入光面342相鄰的出光面（未標出） 及一與該出光面相對的反射面（未標出）。其中該反射面設 置有複數第一微結構362及第二微結構364。該光源32進 步包括一發光面322與導光板34的入光面342相對。第 一微結構362及第二微結構364分別分佈於以入光面342 上兩條等分線324、326上的點為圓心的複數组同心圓狐 上。本發明第二實施例提供背光模組3〇的結構與本發明第 一實施例提供的背光模組20的結構基本相同，其區別在 於··光源32位於導光板34的一角。 本領域技術人員應明白，本發明實施例中光源的發光 面也可包括兩條以上的等分線將發光面分成三個以上的等 份’根據不同的等分線，反射面可包括兩組以上的微結構 分別對應等分線設置於複數同心圓弧上。另，該背光模組 200825551 可包括複數光源及-個導光板。每個光源可包括兩個以上 等分線將發光面分成三個以上的等份，每條等分線任取一 個點。於導光板的反射面上可設置複數組分別以這些點為 圓心的同心圓弧上的微結構。或，進一步地，本發明實施 例的複數組微結構可分佈于以光源發光面上的任意點為圓 心的複數組同可於—絲度上改善導光板的 光出射效率及光出射均勻性。 與先前技術相比較，本發明實施例背光模組於光源數 目不增加及導光㈣微結構數目基本不變的情況下，可具 =高的光出射效率及光出射均勻性。故，該背光模組於 提南液晶顯示裝置的亮度、均勻性及降低能耗方面都有著 廣闊的應用前景 綜上所述，本發明確已符合發明專利之要件，遂依法 提出專利申請。惟，以上所述者僅為本發明之較佳實施例， 自不能以此限制本案之中請專利範圍。舉凡熟悉本案技藝 ^人士援依本發明之精神所作之等效修都或變化，皆應涵 蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1A係先前技術的背光模組的俯視示意圖。 圖1B係先前技術的背光模組的側視示意圖。 圖2A係本發明第一實施例的背光模組的俯視示意圖。 圖2B係本發明第一實施例的背光模組的側視示意圖。 一圖3係本發明第一實施例的背光模組的光源發光面的 不意圖0 11 200825551 圖4係本發明第二實施例的背光模組的俯視示意圖。 【主要元件符號說明】 背光模組 10、20、30 光源 12、22、32 導光板 14、24、34 入光面 142、242、342 出光面 144 、 244 反射面 146 、 246 第一微結構 162、262、362 第二微結構 264 、 364 發光面 222 、 322 等分線 224 、 226 、 324 、 326 12[0002] The invention relates to a backlight module, and more particularly to a backlight module applied to a liquid crystal display device. [Prior Art] In recent years, with the development of display devices for small-sized portable terminal devices such as portable telephones and portable information terminals, small, lightweight, and low-power liquid crystal display devices have been widely used. The most important component of the liquid crystal display device is a liquid crystal display panel including an auxiliary illumination device disposed on the back side thereof, that is, a backlight module, and an auxiliary illumination device disposed on the front side thereof, that is, a front light source module. Light Emitting Diode (LED) is more and more used as a light source in backlight modules of liquid crystal display devices due to its long life, energy saving, environmental protection and small size. Due to the small size of the LED, it is considered as a point source during the design of the backlight module. Referring to FIG. 1A and FIG. 1B, the previous backlight module 10 includes a Light Guide Plate (LGP) 14 and an LED light source 12. The light guide plate 14 mainly includes a light incident surface 142, a light exit surface, a reflective surface I46 and several side surfaces (not shown). The function of the light guide plate 14 is to convert the point light source emitted from the led light source 12 into a surface light source emitted from the light exit surface 144 of the light guide plate 14. In order to improve the efficiency and uniformity of light emitted from the light guide plate 14, a plurality of microstructures 162 may be disposed on the reflective surface. The microstructure 162 is disposed on a concentric arc centered on the LED light source 12. The light emitted by the LED light source 12 is incident on the microstructure 162 almost vertically. Therefore, the microstructure 162 can be prevented from attenuating by the outward spread of the light, thereby improving the conversion efficiency of the LED light source by the point source. , ° surface only 'LED light-emitting part of the area is small, there are still a few ^ size, in some applications with higher precision requirements or the system itself is small size ^ LED size will be the system optical performance For example, the light emission efficiency of the wild light emission uniformity has an influence. In view of this, it is necessary to provide a backlight module having higher light emission efficiency and higher uniformity of light emission.发明 发明 发明 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光The complex _ structure is disposed, and the light source comprises a human filament of a hair illuminating plate. Lace micro-structure The knife U is on the concentric arc of the complex array with the complex point on the light surface. The light source is a light emitting diode. The light-emitting surface of the light source includes a plurality of bisectors to illuminate the light-emitting surface, for example, and the plurality of points are respectively distributed on different bisectors of the light-emitting surface. The pitch of the microstructures distributed on the same arc is the same. The intersection of different groups of concentric (four) is only set to a micro structure. The farther the above microstructure is from the light entrance surface, the larger the size. The farther the above microstructure is from the light entrance surface, the higher the arrangement density. The above microstructure is a concave or convex structure. The above microstructure is a scattering point or a scattering groove. 7 200825551 The cross-sectional shape of the above microstructure includes a rectangle, a square, a polygon, an ellipse, a triangle, a diamond or a pyramid. The light incident surface of the light guide plate is disposed on one side of the light guide plate or a corner of the light guide plate. Compared with the prior art, in the backlight module, the micro-structure on the light guide plate is disposed on a complex array concentric arc centered on a plurality of points on the same light-emitting surface of the same light source. Therefore, the backlight module can have higher light emission efficiency and light emission uniformity without increasing the number of light sources and substantially changing the number of microstructures of the light guide plate. [Embodiment] Hereinafter, embodiments of the present invention will be further described in detail with reference to the accompanying drawings. Referring to FIG. 2A and FIG. 2B, a first embodiment of the present invention provides a backlight group 20 including a light source 22 and a light guide plate 24. The light guide plate 24 includes a light incident surface 242, a light exit surface 244 adjacent to the light incident surface 242, and a reflective surface 246 opposite to the light exit surface 244, wherein the reflective surface 246 is slanted with a plurality of first microstructures. 262 and the second microstructure 脳. The light source 22 is disposed on a side of the light incident surface 242, and the light source & further includes a light emitting surface 222 opposite to the light incident surface 242 of the light guide plate 24. In this embodiment, the light source 22 is a light emitting diode (LED). The V-plate 24 is made of a transparent material such as an acrylic resin, a polycarbonate resin, or a glass. The light is emitted from the light emitting surface 222 of the light source 22, enters the light guide plate 24 through the light incident surface 242, a part of the light is directly emitted from the light output * 244, and the other part of the light is transmitted through the light guide plate 24 according to the principle of reflection of the whole 8 200825551, and the reflective surface is transmitted. After the microstructures 2, 264 on 246 are reflected, they are emitted by the light exit surface 244. Referring to FIG. 3 together, the light-emitting surface 222 of the light source 22 may further include two bisectors 224 and 226 perpendicular to the reflective surface 246 of the light guide plate 24 to divide the light-emitting surface 222 of the light source 22 into three equal parts. The first microstructure 262 disposed on the reflective surface 246 is distributed on a complex array concentric arc centered on any point on the bisector 224, and the second microstructure 264 is decorated on the bisector (10). The complex array is on a concentric arc. The first microstructures and the second microstructures 264 can be concave or convex structures. Preferably, the first and second microstructures 262 and 264 may be scattering points or scattering grooves. The first and second microstructures 262 and 264 may have a rectangular, square, polygonal, elliptical or triangular shape. , diamond or pyramid, etc. Further, in order to improve the uniformity of light emission, the first microstructure 262 or the second microstructure 264 distributed on the same circular arc should have the same pitch. 3. The overlap between the first microstructure 262 and the second microstructure can be reduced by adjusting the spacing between the first microstructure 262 or the second microstructure 264 distributed on the arcs of different groups, respectively. The light guide plate 24 of the embodiment can avoid the phenomenon of uneven light due to the overlap between the first microstructure 262 and the second microstructure. Alternatively, only one of the first micro-structure 262 or the second microstructure 264 may be disposed at the intersection between the first microstructure and the second microstructure 264. It should be understood by those skilled in the art that in this embodiment, the polarization and size of the first microstructure 262 and the second microstructure 264 distributed on different sets of arcs can change the scattering ability of the local region of the reflector 246. Generally, the smaller the degree of facet and size, the stronger the scattering ability. Therefore, in order to avoid the area on the light panel 24 that is close to the light source 22 is too bright, and the area away from the light source & is too dark, in this embodiment, the distribution density and size of the first microstructure 262 and the second microstructure may be mixed. The lining of the wire 22 increases. Further, in order to improve the efficiency of light emission, a reflection film (not shown) may be disposed on the reflection surface 2, which is a metal film or a dielectric film such as an aluminum film, a silver film or the like. The anti-reflection film can further improve the reflectivity of the reflective surface 246 and the first-microstructure 262 and the second microstructure 264. In addition, the light guide plate 24 can be reversed by plating instead of the three sides of the human light surface 242^. Membrane to enhance reflection. Referring to FIG. 4, the second embodiment of the present invention provides a backlight module 3A including a light source 32 and a light guide plate 34. The light guide plate includes a light incident surface 342, a light exit surface (not shown) adjacent to the light incident surface 342, and a reflective surface (not shown) opposite to the light exit surface. The reflective surface is provided with a plurality of first microstructures 362 and a second microstructure 364. The light source 32 further includes a light emitting surface 322 opposite the light incident surface 342 of the light guide plate 34. The first microstructure 362 and the second microstructure 364 are respectively distributed on a complex array concentric circular fox centered on the points on the two bisectors 324, 326 of the light incident surface 342. The structure of the backlight module 3 is the same as that of the backlight module 20 according to the first embodiment of the present invention, and the difference is that the light source 32 is located at a corner of the light guide plate 34. It should be understood by those skilled in the art that the light-emitting surface of the light source in the embodiment of the present invention may also include two or more bisectors to divide the light-emitting surface into three or more aliquots. According to different bisectors, the reflective surface may include two groups. The above microstructures are respectively arranged on the complex concentric arcs corresponding to the bisectors. In addition, the backlight module 200825551 can include a plurality of light sources and a light guide plate. Each light source may include more than two bisectors to divide the illuminating surface into three or more aliquots, one for each bisector. On the reflective surface of the light guide plate, a microstructure on a concentric arc whose respective arrays are centered on these points can be set. Alternatively, the complex array microstructure of the embodiment of the present invention may be distributed over a complex array centered at any point on the light-emitting surface of the light source to improve the light-emitting efficiency and light-emitting uniformity of the light guide plate. Compared with the prior art, the backlight module of the embodiment of the present invention can have a high light exiting efficiency and a light exiting uniformity without increasing the number of light sources and the number of light guiding (four) microstructures. Therefore, the backlight module has broad application prospects in terms of brightness, uniformity and energy consumption of the liquid crystal display device of the Tynan. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent in this case. Any equivalents or changes made by those who are familiar with the skill of the present invention in accordance with the spirit of the present invention shall be within the scope of the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a top plan view of a backlight module of the prior art. 1B is a side elevational view of a prior art backlight module. 2A is a top plan view of a backlight module according to a first embodiment of the present invention. 2B is a schematic side view of a backlight module according to a first embodiment of the present invention. 3 is a perspective view of a light source emitting surface of a backlight module according to a first embodiment of the present invention. FIG. 4 is a top plan view of a backlight module according to a second embodiment of the present invention. [Main component symbol description] backlight module 10, 20, 30 light source 12, 22, 32 light guide plate 14, 24, 34 light-incident surface 142, 242, 342 light-emitting surface 144, 244 reflective surface 146, 246 first microstructure 162 262, 362 second microstructure 264, 364 light emitting surface 222, 322 bisector 224, 226, 324, 326 12