201115190 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種導光板，且特別是有關於一種可均句 導光的導光板及使用其之背光模組。 【先前技術】 背光模組是用以提供液晶顯示面板(liquid crystal display panel，LCD panel)所需之顯示光源。背光模組依入光方式可分 為直下式及側邊入光式’其中側邊入光式的背光模組通常使用 一導光板(light guide plate, LGP)將光源提供的光線轉換成面光 鲁源。 圖1A為習知背光模組的剖面示意圖。請參照圖ία，在 單側入光式的背光模組100中，光源110是設置於導光板12〇 的入光面122旁，以使其所發出之光線由入光面122射至導光 板120内部。導光板120的底面124則形成有多個導光圖案 125 ’用以使射入導光板120之光線能從導光板12〇之出光面 126出射，以形成面光源。 圖1B為圖1A之背光模組中光源與導光板的配置示意 • 圖。請參照圖1B ’導光板120之底面124的導光圖案125係 設計為條狀體’以增加導光圖案125在底面124單位面積内的 分佈密度，進而提升導光板12〇的出光亮度。然而，當光源 11〇包括間隔排列的多個發光單元112時，射入導光板120内 部的光線往往容易集中在鄰近發光單元112之處出射，因而產 生熱點(hot spot)問題，導致背光模組發光不均。 【發明内容】 有鑑於此’本發明的目的就是在提供一種可均勻導光的導 光板，以提局背光模組的出光均勻度。 本發明的再一目的是提供一種背光模組，以提供高輝度且 201115190 發光均勻的面光源。 本發明提出一種導光板，且有至小一 中導光面連接於人光面，並具ί第與導光面，其201115190 VI. Description of the Invention: [Technical Field] The present invention relates to a light guide plate, and more particularly to a light guide plate capable of uniformly guiding light and a backlight module using the same. [Prior Art] A backlight module is a display light source required for providing a liquid crystal display panel (LCD panel). The backlight module can be divided into a direct-lit type and a side-in-light-in type according to the light-incorporating mode. The side-lit light-emitting backlight module usually uses a light guide plate (LPP) to convert the light provided by the light source into a surface light. Lu Yuan. FIG. 1A is a schematic cross-sectional view of a conventional backlight module. Referring to FIG. ία, in the single-side light-emitting backlight module 100, the light source 110 is disposed beside the light-incident surface 122 of the light-guiding plate 12〇, so that the light emitted by the light-emitting device 110 is incident on the light-guide plate from the light-incident surface 122. 120 inside. The bottom surface 124 of the light guide plate 120 is formed with a plurality of light guiding patterns 125' for allowing light incident on the light guide plate 120 to be emitted from the light exit surface 126 of the light guide plate 12 to form a surface light source. FIG. 1B is a schematic diagram of a configuration of a light source and a light guide plate in the backlight module of FIG. 1A. FIG. Referring to FIG. 1B, the light guiding pattern 125 of the bottom surface 124 of the light guide plate 120 is designed as a stripe body to increase the distribution density of the light guiding pattern 125 in the unit area of the bottom surface 124, thereby improving the light exiting brightness of the light guiding plate 12. However, when the light source 11 includes a plurality of light-emitting units 112 arranged at intervals, light entering the inside of the light guide plate 120 tends to concentrate at a position adjacent to the light-emitting unit 112, thereby generating a hot spot problem, resulting in a backlight module. Uneven illumination. SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a light guide plate that can uniformly guide light to improve the uniformity of light output of the backlight module. It is still another object of the present invention to provide a backlight module for providing a high-intensity and 201115190 uniform surface light source. The invention provides a light guide plate, and has a light guide surface connected to a human light surface to a small one, and has a light guide surface and a light guide surface thereof.
八男乐 h域及第二區城。篦一F 域較第二區域鄰近人光面，且第—區域内分佈有多個第一導二 圖案’第二區域内則分佈有多個第二導光圖案。各 案具有第一集光部與第一出光部，第__ I ° „ „^ ^ 兀丨弟集先部較第一出光部鄰 近入先面。各g二導__具有第二钱部與第二出 且第二集光部較第二出光部鄰近从面。Μ，各第—出光部Eight men's music h domain and second district city. The first F-domain is adjacent to the human light surface, and a plurality of first conductive patterns are distributed in the first region. The second region is distributed with a plurality of second light guiding patterns. Each case has a first light collecting portion and a first light emitting portion, and the first __° ° „ „^ ^ 兀丨 集 先 先 先 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 Each g diconductor has a second money portion and a second output portion, and the second light collecting portion is adjacent to the second light emitting portion from the second surface. Hey, each of the first - light department
影㈣為弧線，各第二出光部在導光面的投影輪 廓則為m方面，自第—區域與第二區域之交界處至入 光面的距離為L，其中L與導光板之厚度的比值大於5。 本發明提出-種背絲組，包括上述之料板以及多個光 源。其中，這些光源伽置在導光板的人光面旁，並適於發出 光線，且此光線係經由入光面射入至導光板内。 在本發明之-實施例中，上述這些第一導光圖案的出光部 在導光面的投影輪靡可以相同也可以不同。 在本發明之一實施例中’上述之第一區域包括近光區與緩 衝區，其中緩衝區位於近光區與第二區域之間。而且，在緩衝 區内鄰近近光區的這些第一導光圖案之第一出光部在導光面 的投影輪廓之曲率，係大於鄰近第二區域的這些第一導光圖案 之第一出光部在導光面的投影輪廓之曲率。 在本發明之一實施例中，上述之第一區域包括近光區與緩 衝區，其中緩衝區位於近光區與第二區域之間，且緩衝區内除 第一導光圖案外更分佈有部分的第二導光圖案。 在本發明之一實施例中，上述之緩衝區内的第一導光圖案 與第二導光圖案係交錯排列。 201115190 在本發明之一實施例中，上述之導光板更具有一出光面， 且射入導光板内部的光線係經由此出光面出射，而該導光面為 相對此出光面的底面。 在本發明之一實施例中，上述之導光面為導光板之出光 面。也就是說，射入導光板内部的光線係經由此導光面出射。 在本發明之一實施例中’上述這些光源包括冷陰極螢光燈 管或發光二極體。 在本發明之一實施例中，上述這些第一導光圖案在第一區 域内對應至這些光源間之間距處的分佈密度大於對應至這些 光源處的分佈密度。 — 在本發明之一實施例中，上述對應至光源間之間距的第一 導光圖案在導光面上的技衫面積大於其他第一導光圖案在導 光面上的投影面積。。 在本發明之一實施例中，上述之背光模組更包括反射片， 配置於導光板下方。 在本發明之一實施例中，上述之背光模組更包括光學膜 片，配置在光源所發出之光線自導光板射出後的路徑上。 • 在本發明之一實施例中，上述第一區域中之第一導光圖案 的分佈密度小於第二區域中之第二導光圖案的分佈密度。 本發明之導光板係在導光面上設置多個導光圖案，並且將 鄰近光源之第一導光圖案的第一出光部在導光面的投影輪廓 β又《•十為弧線，以均勻分散光線，進而避免發生熱點的問題。另 一方面，相對第一導光圖案遠離光源的第二導光圖案之第二出 光部，其在導光面的投影輪廓則為直線，以便於增加出光輝 度。由此可知，使用此導光板之背光模組可提供出光均勻立高 輝度的面光源。 201115190 為讓本發明之上述和其他目的、特徵和優點能更明顯易 懂，下文特舉較佳實施例，並配合所附圖式，作詳細說明如下。 【實施方式】 圖2為本發明之一實施例中背光模組的剖面分解示黃 圖。請參照圖2,背光模組200包括導光板210、多個光源 以及光學膜片230。導光板210可為楔型或平板型，並具有入 光面212、出光面214以及導光面216。在本實施例中，導光 面216即為相對出光面214的底面，而入光面212則是連接於 φ 出光面214與導光面216之間。 多個光源220間隔配置於導光板210之入光面212旁，且 其所提供之光線Ρ係經由入光面212射入至導光板21〇内部， 再由出光面214出射。光源220例如是發光二極體(Ught emitting diode，LED)，但不限於此，例如亦可為冷陰極螢光燈 管（cold cathode fluorescent lamp，CCFL)，且相鄰的光源 22〇 之 間具有間隔d。 圖3為圖2之光源與導光板的配置示意圖。請同時參照圖 2及圖3，導光板210的導光面216具有第一區域216a及第二 籲區域216b，且第一區域216a較第二區域216b鄰近入光面 212。第一區域216a内分佈有多個第一導光圖案218a，第二區 域216b内則分佈有多個第二導光圖案218b。第一區域216a 中之第一導光圖案218a的分佈密度小於第二區域216b中之第 一導光圖案218b的分佈密度。其中，這些第一導光圖案218a 是沿入光面212的方向排列成多排，且相鄰之各排第一導光圖 案218a可以彼此交錯’也可以對齊於彼此。而且，各第一導 光圖案218a分別具有第一集光部217a與第一出光部219a，其 中第一集光部217a較第一出光部219a鄰近入光面212。 201115190 另iff，第二導光圖案2l8b也可以是沿入光面212的 方向排列成續，且相鄰之各排第二導朗案218 =笛也2對齊於彼此。而且’各第二導光圖案_ = 3 與第二出光部21%，且第二集光物b 幸，第一出先邻21%鄰近入光面212。具體來說，這些 ΓΓιϊ:1如：第二導光圖案218b例如是以模具射出、蝕刻、 印刷或喷料方式形成於導光板21G的導光面216。 請繼續參照圖2，光源22G所發出之The shadow (4) is an arc, and the projection profile of each of the second light exiting portions on the light guiding surface is m, and the distance from the intersection of the first region and the second region to the light incident surface is L, wherein L and the thickness of the light guide plate The ratio is greater than 5. The present invention proposes a backing wire set comprising the above-described web and a plurality of light sources. Wherein, the light sources are placed beside the human light surface of the light guide plate and are adapted to emit light, and the light is incident into the light guide plate through the light incident surface. In the embodiment of the present invention, the projection rims of the light-emitting portions of the first light guiding patterns on the light guiding surface may be the same or different. In an embodiment of the invention, the first region comprises a low beam region and a buffer region, wherein the buffer region is located between the low beam region and the second region. Moreover, the curvature of the projected contour of the first light-emitting portions of the first light guiding patterns adjacent to the near-light region in the buffer region is greater than the first light-emitting portion of the first light guiding patterns adjacent to the second region. The curvature of the projected contour of the light guiding surface. In an embodiment of the invention, the first region includes a low beam region and a buffer region, wherein the buffer region is located between the low beam region and the second region, and the buffer region is further distributed except the first light guiding pattern. Part of the second light guiding pattern. In an embodiment of the invention, the first light guiding pattern and the second light guiding pattern in the buffer zone are staggered. In an embodiment of the invention, the light guide plate further has a light exiting surface, and the light incident into the light guide plate is emitted through the light emitting surface, and the light guiding surface is opposite to the bottom surface of the light emitting surface. In an embodiment of the invention, the light guiding surface is a light emitting surface of the light guide plate. That is to say, the light that enters the inside of the light guide plate is emitted through the light guide surface. In one embodiment of the invention, the above sources include a cold cathode fluorescent lamp or a light emitting diode. In an embodiment of the invention, the first light guiding patterns have a distribution density corresponding to a distance between the light sources in the first region greater than a distribution density corresponding to the light sources. In one embodiment of the invention, the area of the first light guiding pattern corresponding to the distance between the light sources on the light guiding surface is larger than the projected area of the other first light guiding patterns on the light guiding surface. . In an embodiment of the invention, the backlight module further includes a reflective sheet disposed under the light guide plate. In an embodiment of the invention, the backlight module further includes an optical film disposed on a path after the light emitted by the light source is emitted from the light guide plate. In an embodiment of the invention, the distribution density of the first light guiding pattern in the first region is smaller than the distribution density of the second light guiding pattern in the second region. The light guide plate of the present invention is provided with a plurality of light guiding patterns on the light guiding surface, and the projection contour β of the first light emitting portion of the first light guiding pattern adjacent to the light source on the light guiding surface is further “arc" to be uniform Disperse light to avoid hot spots. On the other hand, the second light exiting portion of the second light guiding pattern, which is away from the light source, is perpendicular to the projected contour of the light guiding surface, so as to increase the light luminance. It can be seen that the backlight module using the light guide plate can provide a surface light source with uniform brightness and high brightness. The above and other objects, features, and advantages of the present invention will become more apparent from the understanding of the appended claims. [Embodiment] FIG. 2 is a cross-sectional exploded view showing a backlight module according to an embodiment of the present invention. Referring to FIG. 2, the backlight module 200 includes a light guide plate 210, a plurality of light sources, and an optical film 230. The light guide plate 210 may be of a wedge type or a flat type, and has a light incident surface 212, a light exit surface 214, and a light guide surface 216. In the present embodiment, the light guiding surface 216 is the bottom surface of the light emitting surface 214, and the light incident surface 212 is connected between the φ light emitting surface 214 and the light guiding surface 216. The plurality of light sources 220 are disposed adjacent to the light incident surface 212 of the light guide plate 210, and the light rays provided by the light source 220 are incident on the light guide plate 21 through the light incident surface 212, and then emitted from the light exit surface 214. The light source 220 is, for example, a light-emitting diode (LED), but is not limited thereto, and may be, for example, a cold cathode fluorescent lamp (CCFL), and has an adjacent light source 22 〇 between Interval d. 3 is a schematic view showing the arrangement of the light source and the light guide plate of FIG. 2. Referring to FIG. 2 and FIG. 3 simultaneously, the light guiding surface 216 of the light guide plate 210 has a first region 216a and a second calling region 216b, and the first region 216a is adjacent to the light incident surface 212 than the second region 216b. A plurality of first light guiding patterns 218a are distributed in the first region 216a, and a plurality of second light guiding patterns 218b are distributed in the second region 216b. The distribution density of the first light guiding pattern 218a in the first region 216a is smaller than the distribution density of the first light guiding pattern 218b in the second region 216b. The first light guiding patterns 218a are arranged in a plurality of rows along the direction of the light incident surface 212, and the adjacent rows of the first light guiding patterns 218a may be staggered with each other or may be aligned with each other. Further, each of the first light guiding patterns 218a has a first light collecting portion 217a and a first light emitting portion 219a, wherein the first light collecting portion 217a is adjacent to the light incident surface 212 than the first light emitting portion 219a. In addition, the second light guiding patterns 214b may be arranged in the direction of the light incident surface 212, and the adjacent second rows of the second guides 218=the flutes 2 are aligned with each other. Moreover, each of the second light guiding patterns _ = 3 and the second light exiting portion 21%, and the second light collecting material b is fortunate, the first outgoing neighbor 21% is adjacent to the light incident surface 212. Specifically, the second light guiding pattern 218b is formed on the light guiding surface 216 of the light guiding plate 21G by, for example, injection, etching, printing or spraying. Please continue to refer to Figure 2, the light source 22G issued
2内^:會先照射至第—導光圖案218a的第—集光H 導的第二集先部217b’然後再反射至第-導士圖案218a的第—出光部⑽與第二導光圖案⑽的第 21% ’並經由第—出光部21%與第二出光部通 的折射後，由導光板210的出光面214出射。 特别的疋’各第-導光圖案218a的第一出光部2⑼在導 ，面21㈣投影輪㈣弧線，以利於使光線μ經由第一出光 ^ 219a折射後均勻發散，進而避免產生熱點_ _的問題。 =本=施例來說’第-導光圖案218a例如是呈球狀。也就是 ^第-出光部219a與第-集光部心在導光面216的投影 輪靡均為圓弧線，但本發明不限於此。而且，在其他實施例中， ^於第-區域216a内的這些第—導光圖案施，其第一出 光部⑽在導光面加的投影輪廓可以不同於彼此。 另-方面’雖然光源22〇所發出的光線p自入光面212 ，入至導光板21〇内之後’其亮度會從第—區域⑽往第二 =216b遞減’但由於各第二導光圖案鳩的第二出光部 b在導光面216的投影輪#為直線，因此可提高經由第二 導光圖案惑之第二出光部219b折射出的光線亮度，進而改 201115190 善從導光板210之出光面214出射之光線的整體均勻度。本實 施例係將第二導光圖案218b設計為長方體，以便於增加第二 導光圖案218b在第二區域216b内的分佈密度，進而提高導光 板210的出光輝度。也就是說，第二出光部21处與第二集光 部217b在導光面216的投影輪廓均為直線，但本發明不限於 此。在其他實施例中，分佈於第二區域216b内的這些第二導 光圖案218b，其第二出光部219b在導光面216的投影輪廓也 可以不同於彼此。 此外，本實施例之導光板21〇自第一區域216a與第二區 籲域216b之交界處至入光面212的距離為l，而較佳L與導光 板之厚度T的比值大於5。當將L與導光板之厚度τ的比值控 制在大於5時，可明顯提咼導光板出光的均勻性，避免熱點(h〇t spot)產生。 請再次參照圖2，光學膜片230則是配置於導光板210之 出光面214的上方。其中，光學膜片230可以包括增光片 (brightness enhancement film，BEF)及擴散膜(diffusing fllm)至 少其中之一。另外，為進一步提高光利用率，通常會在導光板 # 210下方配置一反射片240，用以將未被第一導光圖案218a與 第二導光圖案218b折射回導光板21〇内部的光線反射至導光 板210内部。 值得注意的是，雖然圖2所繪示的背光模組2〇〇為單側入 光式的背光模組，但其並非用以限定本發明。熟習此技藝者應 該知道，本發明之導光板210除了可以應用於圖2之背光模組 200中以外，還可以應用於多側入光式的背光模組中。 雖然上述實施例僅舉球狀之第一導光圖案21如及長方體 之第二導光圖案218b為例做說明，但本發明並不限於此。在 201115190 、； Γ*列中，第一出光部219&在導光面216上的投影輪廓 則〇疋正弦/餘弦曲線（見圖4Α)、連續圓弧曲線（見圖4Β) 或不規則弧線（見圖4C)，且第一導光圖案黯的第一集光 邙217a在導光面216上的投影輪廓可以是直線（見圖至圖 4D)也可以是弧線（見圖4E)。另—方面，第二導光圖 案 218b 的第-集光部2Hb在導光面训上的投影輪廓也可以是狐 線，如圖5A至圖5C所示。 圖6為本發明之另—實施例中光源與導光板的配置示意 圖。請參照6，本實施例之導光板31〇貞前述實施例之導光 •板’相似’以下僅針對兩者相異之處加以說明。 在導光板310的第一區域216a内，第一導光圖案218a於 對應至光源220處的平均分佈密度小於對應至間隔植的平均 分佈密度。以本實施例來說，導光板31〇之導光面216在鄰近 光源220之處並未分佈有第一導光圖案218a。 特別的疋，對應至間隔d中央的第一導光圖案218a在導 光面216的投影面積例如是大於其餘第一導光圖案218a在導 光面216的投影面積。如此一來，當光源22〇所發出之光線入 籲射至導光板310内部之後，可藉由各間隔d所對應的第一導光 圖案218a來散射光線，以避免產生暗帶。 圖7為本發明之另一實施例中的導光板正視示意圖。請參 照圖7，本實施例之導光板410與前述實施例之導光板21〇相 似，以下僅針對兩者相異之處加以說明。 導光板410之第一區域216a包括近光區316與緩衝區 317，其中缓衝區317位於近光區316與第二區域216b之間。 而且，在緩衝區317内’鄰近近光區316之第一導光圖案2i8a 的第一出光部219a在導光面216 (見圖2)的投影輪廓之曲率 201115190 大於鄰近第二區域218b之第一導光圖案218a的第一出光部 219a在導光面216的投影輪廓之曲率。以本實施例來說，位 於緩衝區317内的這些第一導光圖案218a是依據其第一出光 部219a在導光面216的投影輪廓之曲率，由大到小自近光區 316朝第二區域218b的方向依序排列，因而可提高導光板41〇 的整體出光均勻度。 圖8為本發明之另一實施例中導光板的正視示意圖。請參 照圖8 ’本實施例之導光板51〇與前述實施例之導光板41〇相 似’以下僅針對兩者相異之處加以說明。 導光板510之緩衝區317内除了分佈有第一導光圖案 218a外，更有部分的第二導光圖案218b分佈於其内。換言之， 本實施例之導光板210的緩衝區317内同時分佈有第一導光圖 案218a與第二導光圖案218b，且這些第一導光圖案218a分別 與這些第二導光圖案218b交錯排列，因而可提高導光板51〇 的整體出光均勻度。 值得一提的是’雖然在前述實施例中，導光板之第一導光 圖案218a與第二導光圖案218b均分佈於相對出光面214的導 # 光面216 (也就是導光板的底面），但本發明並不限於此。熟 習此技藝者應該知道，導光面216也可以是導光板的出光面。' 也就是說’第一導光圖案218a與第二導光圖案218b亦可以分 佈在導光板610之出光面614上，如圖9所示。當然，在其他 實施例中’第一導光圖案218a與第二導光圖案218b更可以同 時分佈於導光板610的出光面614與底面616上，本發明不在 此做限定。 綜上所述’本發明之導光板的導光面上設置有多個導光圖 案，其中由於鄰近光源的導光圖案之第一出光部在導光面的投 201115190 ，輪廓為弧線，鼠可以均勻地折射之統，_免光線集中 出射而導致熱點的問題。另一方面，遠離光源的導光圖案之第 :出光部在導絲的投影輪❹丨為直線，以提高人射至導光板 :部之光線的出射率，進而增加導光板的出光輝度。由此可 :’使用此導紐之背域組可提供出光均勻且高輝度的面光 源。 雖然本發明已以較佳實施例揭露如上，然其並非用以限定 發:’任何熟習此技藝者’在不脫離本發明之精神和範圍 内，當可作些許之更動與潤飾，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】 圖1A為習知背光模組的剖面示意圖。 圖1B為圖1A之背光模組中光源與導光板的配置示意圖。 圖2為本發明之一實施例中背光模組的剖面分解示意圖。 圖3為圖2之光源與導光板的配置示意圖。 圖4A至圖4E為本發明之實施例中的第一導光圖案示意 圖〇 圖5八至圖5C為本發明之實施例中的第二導光圖案示意 圖〇 圖6為本發明之另一實施例中光源與導光板的配置示意 圖〇 圖7為本發明之另一實施例中的導光板正視示意圖。 圖8為本發明之另一實施例中導光板的正視示意圖。 圖9為本發明之另一實施例中背光模組的剖面分解示意 圖。 12 201115190 【主要元件符號說明】 100、200 :背光模組 110、220 :光源 112 :發光單元 120、210、310、410、510、610 :導光板 122、212、612 :入光面 124、616 :底面 125 :導光圖案 126、214、614 :出光面 216 :導光面 216a :第一區域 216b :第二區域 217a :第一集光部 217b :第二集光部 218a :第一導光圖案 218b :苐二導光圖案 219a :第一出光部 21% :第二出光部 230 :光學膜片 240 :反射片 316 :近光區 317 :緩衝區 d :間隔 L :距離 P :光線 T :厚度 132: The second episode 217b' which is first irradiated to the first-collecting light H of the first light guiding pattern 218a and then reflected to the first light-emitting portion (10) and the second light guiding portion of the first-guide pattern 218a The 21%th portion of the pattern (10) is refracted by the first light-emitting portion 21% and the second light-emitting portion, and then emitted from the light-emitting surface 214 of the light guide plate 210. In particular, the first light-emitting portion 2 (9) of each of the first light-guiding patterns 218a is on the surface of the second (four) projection wheel (four), so as to facilitate the light ray to be uniformly diverge after being refracted by the first light-emitting 219a, thereby avoiding the generation of hot spots __. problem. = This = In the embodiment, the -th light guiding pattern 218a is, for example, spherical. That is, the projection rim of the first light-emitting portion 219a and the first light-collecting portion on the light-guiding surface 216 are circular arc lines, but the present invention is not limited thereto. Moreover, in other embodiments, the first light guiding patterns in the first region 216a may have different projection profiles of the first light exiting portions (10) on the light guiding surface. On the other hand, although the light p emitted from the light source 22 is from the light incident surface 212, after entering the light guide plate 21, its brightness will decrease from the first region (10) to the second portion 216b, but due to the second light guide. The second light exiting portion b of the pattern 为 is a straight line on the projection wheel # of the light guiding surface 216. Therefore, the brightness of the light refracted by the second light emitting portion 219b that is confused by the second light guiding pattern can be improved, and the light can be changed from the light guide plate 210 to 201115190. The overall uniformity of the light emitted by the light exit surface 214. In this embodiment, the second light guiding pattern 218b is designed as a rectangular parallelepiped, so as to increase the distribution density of the second light guiding pattern 218b in the second region 216b, thereby improving the light exiting brightness of the light guide plate 210. That is, the projection profiles of the second light-emitting portion 21 and the second light-concentrating portion 217b on the light-guiding surface 216 are both straight lines, but the present invention is not limited thereto. In other embodiments, the second light guiding patterns 218b distributed in the second region 216b may have different projection profiles of the second light exiting portions 219b on the light guiding surface 216. In addition, the light guide plate 21 of the present embodiment has a distance l from the boundary between the first region 216a and the second region 216b to the light incident surface 212, and the ratio of the preferred L to the thickness T of the light guide plate is greater than 5. When the ratio of the thickness of L to the thickness τ of the light guide plate is controlled to be greater than 5, the uniformity of light emission from the light guide plate can be significantly improved, and the occurrence of hot spots (h〇t spot) can be avoided. Referring again to FIG. 2, the optical film 230 is disposed above the light-emitting surface 214 of the light guide plate 210. The optical film 230 may include at least one of a brightness enhancement film (BEF) and a diffusing film (diffusing fllm). In addition, in order to further improve the light utilization rate, a reflective sheet 240 is disposed under the light guide plate # 210 for refracting the light that is not refracted back to the inside of the light guide plate 21 by the first light guide pattern 218a and the second light guide pattern 218b. Reflected to the inside of the light guide plate 210. It should be noted that although the backlight module 2 illustrated in FIG. 2 is a single-sided light-emitting backlight module, it is not intended to limit the present invention. It should be understood by those skilled in the art that the light guide plate 210 of the present invention can be applied to a multi-side light-emitting backlight module in addition to the backlight module 200 of FIG. Although the above embodiment is merely illustrative of a spherical first light guiding pattern 21 such as a rectangular parallelepiped second light guiding pattern 218b, the present invention is not limited thereto. In the 201115190, Γ* column, the projection profile of the first light exiting portion 219 & on the light guiding surface 216 is 〇疋 sine / cosine curve (see Figure 4 Α), continuous arc curve (see Figure 4 Β) or irregular arc (See FIG. 4C), and the projection profile of the first collector stop 217a of the first light guiding pattern 在 on the light guiding surface 216 may be a straight line (see FIG. 4D) or an arc (see FIG. 4E). On the other hand, the projection profile of the first light collecting portion 2Hb of the second light guiding pattern 218b on the light guiding surface can also be a fox line, as shown in Figs. 5A to 5C. Fig. 6 is a schematic view showing the arrangement of a light source and a light guide plate in another embodiment of the present invention. Referring to Fig. 6, the light guide plate 31 of the present embodiment is similar to the light guide plate of the foregoing embodiment. Hereinafter, only the differences between the two will be described. In the first region 216a of the light guide plate 310, the average light distribution density of the first light guiding pattern 218a corresponding to the light source 220 is smaller than the average distribution density corresponding to the spacer. In this embodiment, the light guiding surface 216 of the light guide plate 31 is not distributed with the first light guiding pattern 218a adjacent to the light source 220. In particular, the projected area of the first light guiding pattern 218a corresponding to the center of the interval d on the light guiding surface 216 is, for example, larger than the projected area of the remaining first light guiding patterns 218a on the light guiding surface 216. In this way, after the light emitted by the light source 22 is incident on the inside of the light guide plate 310, the light can be scattered by the first light guiding pattern 218a corresponding to each interval d to avoid dark bands. Figure 7 is a front elevational view of a light guide plate in another embodiment of the present invention. Referring to Fig. 7, the light guide plate 410 of the present embodiment is similar to the light guide plate 21 of the foregoing embodiment, and only the differences between the two will be described below. The first region 216a of the light guide plate 410 includes a low beam region 316 and a buffer region 317, wherein the buffer region 317 is located between the low beam region 316 and the second region 216b. Moreover, in the buffer zone 317, the curvature of the projection profile of the first light exiting portion 219a of the first light guiding pattern 2i8a adjacent to the low beam region 316 on the light guiding surface 216 (see FIG. 2) is greater than that of the adjacent second region 218b. The curvature of the projection profile of the first light exiting portion 219a of the light guiding pattern 218a on the light guiding surface 216. In the present embodiment, the first light guiding patterns 218a located in the buffer zone 317 are based on the curvature of the projection profile of the first light exiting portion 219a on the light guiding surface 216, from large to small from the low beam region 316 toward the first The directions of the two regions 218b are sequentially arranged, so that the overall light uniformity of the light guide plate 41〇 can be improved. FIG. 8 is a front elevational view of a light guide plate according to another embodiment of the present invention. Referring to Fig. 8, the light guide plate 51 of the present embodiment is similar to the light guide plate 41 of the above-described embodiment. Hereinafter, only the differences between the two will be described. In addition to the first light guiding pattern 218a, a portion of the second light guiding pattern 218b is distributed in the buffer zone 317 of the light guide plate 510. In other words, the first light guiding pattern 218a and the second light guiding pattern 218b are simultaneously distributed in the buffer zone 317 of the light guide plate 210 of the embodiment, and the first light guiding patterns 218a are alternately arranged with the second light guiding patterns 218b, respectively. Therefore, the overall light uniformity of the light guide plate 51 can be improved. It is worth mentioning that, in the foregoing embodiment, the first light guiding pattern 218a and the second light guiding pattern 218b of the light guiding plate are both distributed on the light guiding surface 216 of the opposite light emitting surface 214 (that is, the bottom surface of the light guiding plate). However, the invention is not limited thereto. It will be appreciated by those skilled in the art that the light directing surface 216 can also be the light exiting surface of the light guide. That is, the first light guiding pattern 218a and the second light guiding pattern 218b may also be distributed on the light emitting surface 614 of the light guiding plate 610, as shown in FIG. Of course, in other embodiments, the first light guiding pattern 218a and the second light guiding pattern 218b may be distributed on the light emitting surface 614 and the bottom surface 616 of the light guiding plate 610 at the same time, which is not limited herein. In summary, the light guiding surface of the light guide plate of the present invention is provided with a plurality of light guiding patterns, wherein the first light emitting portion of the light guiding pattern adjacent to the light source is projected on the light guiding surface 201115190, and the contour is an arc, and the mouse can Evenly refracting the system, _ avoiding the problem that the light is concentrated and emitted, resulting in hot spots. On the other hand, the first light guiding pattern away from the light source is a straight line on the projection rim of the guide wire to increase the light exit rate of the light emitted by the person to the light guide plate, thereby increasing the light output of the light guide plate. This allows: 'The back-field set using this guide provides a uniform light source with high brightness. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the scope of the invention, and the 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. 1A is a schematic cross-sectional view of a conventional backlight module. 1B is a schematic view showing the arrangement of a light source and a light guide plate in the backlight module of FIG. 1A. 2 is a cross-sectional, exploded view of a backlight module in accordance with an embodiment of the present invention. 3 is a schematic view showing the arrangement of the light source and the light guide plate of FIG. 2. 4A to 4E are schematic diagrams showing a first light guiding pattern in an embodiment of the present invention. FIGS. 5-8 to 5C are schematic diagrams showing a second light guiding pattern in an embodiment of the present invention. FIG. 6 is another embodiment of the present invention. Schematic diagram of the arrangement of the light source and the light guide plate in the example. FIG. 7 is a front view of the light guide plate in another embodiment of the present invention. FIG. 8 is a front elevational view of a light guide plate according to another embodiment of the present invention. Figure 9 is a cross-sectional, exploded view of a backlight module in accordance with another embodiment of the present invention. 12 201115190 [Description of main component symbols] 100, 200: backlight module 110, 220: light source 112: light emitting unit 120, 210, 310, 410, 510, 610: light guide plates 122, 212, 612: light incident surface 124, 616 : bottom surface 125 : light guiding patterns 126 , 214 , 614 : light emitting surface 216 : light guiding surface 216 a : first region 216 b : second region 217 a : first light collecting portion 217 b : second light collecting portion 218 a : first light guiding Pattern 218b: second light guiding pattern 219a: first light emitting portion 21%: second light emitting portion 230: optical film 240: reflective sheet 316: low beam region 317: buffer d: interval L: distance P: light T: Thickness 13