201100924 u885 30883twf.doc/a 六、發明說明： 【發明所屬之技術領域】 且特別是關於一種光 本發明是有關於一種背光模組 線集中且增亮效果良好的背光模組 【先前技術】 圖1為習知-種背光模組的示意 知的背光模組100具有導夹招11() ^ 、 ,等无扳〗〗〇、反射板120以及光源 ‘光板110具有入光面u〇a、出光面i應以及底面 n〇C。出光面腿與底面·相對，且入光面論連接於 出光面110b與底面！ 10c之間。光源13〇面向導光板i 1〇之入 光面110a，而絲13〇提供絲L狀射至人光面腕。反 射板120具有反射表面12〇a，且反射板12〇設置於 之底面110c下方。 北背光模組100—般在顯示器中作為顯示光源之用，因 此^光模組100的光線L較佳是集中於使用者可觀看的角 度範圍内。也就是說，背光模組1〇〇的設計較佳是可使光 線L集中於正視方向D，而在此的正視方向D大體上垂直 於導光板110之出光面ll〇b。 當光線L入射至反射板12〇時，光線l與反射面12〇a 的法線方向T1相交一入射角αι。此時，光線L會被反射 面120a反射’且根據反射定律，反射角…會與入射角w 相同。當光線L的入射角αΐ越大時，光線L的反射角α2 也就越大。也就是說，入射角αΐ越大時，光線L會以大角 201100924 -06-0885 30883twf.doc/n 度斜射出導光板110而偏離正視方向D。 若部分光線L以大角度斜射出導光板u〇，則光學暝 片無法有效利用光線L。所以，背光模組1〇〇的光萃取致 率(light extraction rate)偏低，其增亮效果仍有許多改進 空間。 【發明内容】 〇 本發明提出一種背光模組，可使光線集中並具有良好的 增亮效果。201100924 u885 30883twf.doc/a VI. Description of the invention: [Technical field of the invention] and particularly relating to a kind of light The present invention relates to a backlight module in which a backlight module is concentrated and has a brightening effect. [Prior Art] A schematic backlight module 100 of a conventional backlight module has a guide clip 11 () ^, , and so on, a reflector 120, and a light source 'light panel 110 having a light incident surface u〇a, The light exit surface i should be as well as the bottom surface n〇C. The light-emitting surface is opposite to the bottom surface, and the light-incident surface is connected to the light-emitting surface 110b and the bottom surface! Between 10c. The light source 13 is guided by the light guide plate i 1 into the light surface 110a, and the wire 13 is provided with a wire L to the human face. The reflecting plate 120 has a reflecting surface 12A, and the reflecting plate 12 is disposed below the bottom surface 110c. The north backlight module 100 is generally used as a display light source in the display. Therefore, the light L of the optical module 100 is preferably concentrated within an angle range viewable by the user. That is, the design of the backlight module 1 is preferably such that the light line L is concentrated in the front view direction D, and the front view direction D is substantially perpendicular to the light exit surface 11b of the light guide plate 110. When the light ray L is incident on the reflecting plate 12, the light ray l intersects the normal direction T1 of the reflecting surface 12A with an incident angle ? At this time, the light ray L is reflected by the reflecting surface 120a' and the reflection angle... is the same as the incident angle w according to the law of reflection. When the incident angle α 光线 of the light ray L is larger, the reflection angle α2 of the light ray L is larger. That is to say, when the incident angle αΐ is larger, the light beam L is obliquely emitted from the light guide plate 110 at a large angle of 201100924 -06-0885 30883 twf.doc/n, and deviates from the front view direction D. If a part of the light L is obliquely emitted from the light guide plate u〇 at a large angle, the optical sheet cannot effectively utilize the light L. Therefore, the light extraction rate of the backlight module 1 is low, and there is still much room for improvement in the brightness enhancement effect. SUMMARY OF THE INVENTION The present invention provides a backlight module that concentrates light and has a good brightness enhancement effect.
本發明提出-種背光模組，包括導光板、光源、反射板 以及保護基板。導光板具有人光面、出光面以及底面。出 光面與底面相對，且入光面連接於出光面與底面之間。光 源面向導光板之入光面，以使光源提供之光線入射至入光 面。反射板設置於導光板之底面下方。反射板面向底面之 -側具有多個微結構，其巾各微結構具有多個反射表面， 且各反射表面不與出光面平行以反射光線。保護基板設置 於反射板之多個微結構上’以在乡倾結赫賴 間形成封閉空間。 明材料或光阻 在本發明之—實施例中，上述背光模組更包括填充透 光材料，其填充於保護基板與反射板之間的封閉空間中。 填充透光材料的折射率大於或等於i。填充透光材料為透 配置=、ί構:施例中，上述透光材料實質上編 5 30883twf.doc/a 201100924 m -υ885 在本發明之一實施例中，上述之背光模組，其中各反 射表面具有一頂交角以及兩底交角，此一頂交角指向保^蔓 基板或背向保護基板，而兩底交角分別與頂交角相鄰。 在本發明之一實施例中，上述之背光模組，其中頂交 角為120。〜155。，而底交角為12.5。〜30。。 、又 在本發明之一實施例中，上述之背光模組，其中底交 角為30。〜89。。 _又 在本發明之一實施例中’上述多個微結構為多個錐形 微結構或多個類錐形微結構。這些微結構的尖端例如是 向導光板，或是背向導光板。 在本發明之一實施例中，上述多個微結構為多個金字 塔型微結構或多個三角錐微結構。 在本發明之一實施例中’上述多個微結構為規則排列 或不規則排列。 在本發明之一實施例中，上述多個微結構至少部分相 連。 在本發明之一實施例中，上述多個微結構彼此不相 連。 在本發明之一實施例中，上述各微結構的各反射表面 為光滑平面或粗糙表面。 在本發明之一實施例中’上述之背光模組更包括光學 片組，設置於導光板之出光面上方。 基於上述，由於本發明的背光模組具有微結構設計的 反射板，可改變光線進入導光板的角度，因此可令光線導 6 201100924‘㈣ 30883twf.doc/n 在適合光學膜組的角度、提高光萃取效率。 為讓本發明之上述特徵和優點能更明顯易懂，下文特 舉實施例’並配合所附圖式作詳細說明如下。 【實施方式】 圖2為本發明一實施例之背光模組示意圖。請參照圖2， 月光模組200包括導光板21〇、反射板220、光源230以及保 s蔓基板240。 〇 導光板210具有入光面210a、出光面210b以及底面 210c。出光面210b與底面210c相對，且入光面210a連接於 出光面210b與底面210c之間。光源230面向導光板210之入 光面210a ’而光源230提供光線L以入射至入光面21〇a。 反射板220設置於導光板21〇之底面2l〇c下方。反射板 220面向導光板210的底面2i〇c之一側具有多個微結構222。 其中，各微結構222具有多個反射表面222a，且各反射表面 222a不與導光板210的出光面21〇b平行以反射光線^。換言 〇 之，各反射表面222a在背光模組200中係為傾斜的斜面。在 本實施例中’上述各微結構222的反射表面222a 滑平面或粗糙表面。 β 在本實施例中，較佳可使背光模組200的光線L集中 於正視方向D。正視方向D乃是指使用者觀看應用背光模 組200之顯示器的視線方向’在此正視方向D大體上垂直 於導光板210之出光面21〇b。不過，在其他的顯示器設計 中，正視方向D也可以不是垂直於出光面2l〇b。 201100924 -0885 30SS3twf.doc/n 在背光模組200中’當光線L入射於反射板220的反射 表面222a時所呈現的入射角α1以及反射角α2如圖2所繪 示。由於各反射表面222a為傾斜的斜面，因此光線L經反射 表面222a反射後的行進方向將會趨近於正視方向〇。也就是 說，背光模組200的設計可使光線L集中於正視方向D上， 而具有較佳的光萃取效率。 此外，背光模組200更包括保護基板240以及光學片組 250。保護基板240設置於反射板220之微結構222上，而 光學片組25〇設置於導光板210上方。 保護基板240的設置’可避免反射板220上的微結構 222與導光板210直接接觸而造成微結構222與導光板210 的損壞。具體而言，保護基板240的材質可為透明的基板 材質。在本實施例中，反射板220的多個微結構222間具 有透光材料242 ’而透光材料242位於保護基板240與反 射板220之間的封閉空間中。在另一未繪示的實施例中， 亦可使透光材料242層狀地配置於多個微結構222上，以 提供保護微結構222的作用。此外，上述透光材料242的 折射率可大於或等於1。舉例來說，透光材料242可包括 透明材料或空氣或光阻。 進一步而言，為了提高背光模組200的亮度均句性， 可設置光學片組250以使整個背光模組2〇〇所提供的光線 L均勻化。光學片組250較佳可使光源230所發出的光^ L擴散’以及在不損及光源230凴度的情況下保持整個背 光模組200所發出的光線L亮度。 201100924 一…“ —206-0885 30883twfdoc/n 在背光模組200中，光學片組250例如可使用擴散片 (Diffuser)、增壳膜片（Brightness Enhancement film，BEF)或 雙重增亮膜片（DBEF)等光學膜片之組合。光學片組25〇搭 配反射板220可以有效地達到光均勻與集中的目的。當 然，本發明不限制光學片組250所使用光學膜片的數量或 種類，本領域具通常知識者當可視需要加以搭配設計。 接下來，將更進一步針對本發明所提出的微結構設計 進行說明。 ❹ 圖3⑻〜⑷各為本發明—實施例之微結構示意圖。在本實 施例中，反射板220的單個微結構222如圖3⑻所示。 、 請同時參照圖2及圖3⑻，在微結構222的多個反射表 面222a中，各反射表面222a具有一頂交角^以及兩底交 角θ2 ’頂父角Θ!指向保護基板240或背向保護基板，而兩 ^交角θ2分別與頂交角01相鄰。更詳細地說，在微結構222 相互邮接的側邊222b $-直線，且任兩相鄰的 之間失敬抓。在本實施例中，上述之觀_^130 ❹ ，而在其他實施例中，頂交角可介於12〇。〜155。之間。 222c 222Γ各反射面现遠_交帥的曰底邊 222c與其中一側邊222b之間夾底交备Q ^ =•5 °〜3(Γ時，背光模組2〇〇可具紐佳的增亮效果^在= 中。，為了使加卫程序更為簡便，亦可使底交角匕為 另外，本實施例的反射面222a例如為 因此各底邊孤與側邊222b之間所失的底交机=。 9 30883twf.doc/n 201100924 »«^ v w **〇 δ δ ^ 但本舍明不限疋反射面222a為等腰三角形，在另—實施例 中，反射面222a也可以是不等腰的形狀。 請同時參照圖2及圖3(a)，由於反射板220的各反射表 面222a為傾斜的斜面，由光源23〇發出的光線L經過反射表 面222a反射之後可以朝向正視方向D集中。因此，對於使用 者而言’在相同規格的光源230設計下，背光模組2〇〇相較於 習知之具有反射板120的背光模組100在正視方向D上可以 獲得較亮的光線。換言之，背光的出絲度可以有效 地被提1¾ 不需改變H規格或是制增亮效絲 昂貴的增亮膜片。 Μ在本實施例中，反射板220的微結構222為—四角錐形 微結構，其例如為一種金字塔型微結構。換言之，微結構 =的各個反射表面222a都是由三角形的平面所組成^微 厂構222的頂部具有—頂點薦。在本發明的其他實施例中， 微結構222的頂部可以不是一頂點而是—平面或是一直 =圖3⑹所示。舉例而言，在圖3(b)中，微結構划 的糾為一平面狀的頂面2謝，而在 的頂部則例如為一脊線2223d。 儆、…構2223 在此，圖3(b)與圖3(c)所繪示的微結構222卜2223並非 ，準的角錐狀，所以本發明係以類錐狀微結構稱之。這些類錐 多個傾斜的反射表面取以藉由反射作用 視的方向。也就是說，_與_ ^的此構2221、助也有助於提高背光模謂的正 10 201100924 2U6-0885 30883twf.doc/n 在另一實施例中’反射板的微結構則可以如圖3(^所示 的三角錐形微結構2225。而在其他實施例中，反射板的微結 構222還可以疋如圖3(e)所示的類三角錐形微結構2227。但 此處所述之微結構僅為舉例說明，本發明並不限於圖3(a)〜(e) 所示的錐形微結構或類錐形微結構。在其他的實施例中， 微結構222也可以是其他多角錐形微結構或是類多角錐形微 結構等。 圖4為本發明一實施例之反射板示意圖。請參照圖2 Ο 及圖4 ’在背光模組20〇中，反射板220的多個微結構222 的尖端為指向導光板210’且多個微結構222為規則排列。 在另一未繪示的實施例中，多個微結構222也可以設計成 不規則排列。 背光模組200的多個微結構222為彼此相連，在另一實 施例中’为光权組200則可採用如圖5所示的反射板320，其 中多個微結構222為部份相連。而在又一實施例中，背光模組 200可採用如圖6所示的反射板420，其中多個微結構222為 ❹ 彼此不相連。此外，背光模組200還可採用如圖7所示的反射 板520，其中多個微結構222例如是扇形分佈。 在其他的實施例中，背光模組200還可採用如圖8所示 的反射板620，其中多個微結構622的尖端為背向導光板 210。也就是說，多個微結構622是凹入反射板620内部。而 類似地，多個凹入反射板62〇的微結構622除了可以彼此不 相連外，還可以是彼此相連或部份相連。另外，微結構622 可以是規則排列，也可以是不規則排列。 11 201100924 j-0885 30883nvf.doc/n 圖9為習知的背光模組，在不同視角下的光提取率測試 結果示思圖。圖10為本發明的背光模組，在不同視角下的光 取率測試結果不意圖。 睛同時麥照圖9及圖10，其中，曲線7〇1表示習知的背 光模組在不同方位角的光提取率；曲線702表示習知的背光模 組在不同仰角的光提取率；曲線謝表示本發明的背光模組在 不同方位肖的光提取率；以及，曲線表示本發明的背光模 組在不同仰角的光提取率。 、 雖;.S曲、線7〇2、802择員示習知與本發明背光模組的光取出 率皆向負15度集中’但由曲線7m、觀触較可以看出，本 ^月的月，組’其在不同方位角的光提取率會有明顯的提 沾if其疋’本發日㈣背光麵在方位角為45度時會有最高 的光提取率。 結構irtu於本發明的背光模組中，反射板具有微 二二發明的背光模組可使光線集中、提高光 於太^日日/^亚"不同視角提供高亮度之光線。此外，由 加射板可叫有鱗絲的料，而有助於增 定本：：本f明已以實施方式揭露如上，然其並非用以限 何所屬技術領域中具有通常知識者，在不脫 本發明之_1 lilt7可作些許之更動與潤飾，故 準。 ㈤田視後附之申請專利範圍所界定者為 【圖式簡單說明】 12 201100924 206-0885 30883twf.doc/i 圖1為習知一種背光模組的示意圖。 圖2為本發明一實施例之背光模組示意圖。 圖3(a)〜(e)各為本發明一實施例之微結構示意圖。 圖4為本發明一實施例之反射板示意圖。 圖5為本發明一實施例之反射板示意圖。 圖6為本發明一實施例之反射板示意圖。 圖7為本發明一實施例之反射板示意圖。 圖8為本發明一實施例之反射板示意圖。 圖9為習知的背光模組，在不同視角下的光提取率測試 結果示意圖。 圖10為本發明的背光模組’在不同視角下的光提取率測 試結果示意圖。 . 【主要元件符號說明】 100、200 :背光模組 110、210 :導光板 11.0a、210a :入光面 110b、210b :出光面 110c、210c :底面 120、220、320、420、520、620 :反射板 222、622、2221、2223、2225、2227 :微結構 120a、222a :反射表面 130、230 :光源 240 :保護基板 13 201100924 0885 30883twf.doc/n 242 :透光材料 250 :光學片組 D :正視方向 L :光線 αΐ :入射角 α2 :反射角 :頂交角 θ2 :底交角 701、702、801、802 :曲線 14The invention provides a backlight module, which comprises a light guide plate, a light source, a reflector and a protection substrate. The light guide plate has a human light surface, a light exit surface, and a bottom surface. The light emitting surface is opposite to the bottom surface, and the light incident surface is connected between the light emitting surface and the bottom surface. The light source faces the light incident surface of the light guide plate so that the light provided by the light source is incident on the light incident surface. The reflector is disposed below the bottom surface of the light guide plate. The reflector has a plurality of microstructures facing the bottom surface, and each of the microstructures has a plurality of reflective surfaces, and each of the reflective surfaces is not parallel to the light exiting surface to reflect light. The protective substrate is disposed on the plurality of microstructures of the reflector to form a closed space between the homes. Bright material or photoresist In the embodiment of the present invention, the backlight module further includes a filled light transmissive material filled in an enclosed space between the protective substrate and the reflective plate. The refractive index of the filled light transmissive material is greater than or equal to i. The light-transmissive material is in a transparent configuration. In the embodiment, the light-transmissive material is substantially woven. 5 30883 twf.doc/a 201100924 m - υ 885 In one embodiment of the present invention, the backlight module described above, wherein each The reflective surface has a top intersection angle and an intersection angle of the two bottoms, the top intersection angle pointing to the protection substrate or the back protection substrate, and the intersection angles of the two bottoms are respectively adjacent to the top intersection angle. In an embodiment of the invention, the backlight module has a top angle of 120. ~155. And the bottom angle is 12.5. ~30. . In an embodiment of the invention, the backlight module has a bottom angle of 30. ~89. . Further, in an embodiment of the invention, the plurality of microstructures are a plurality of tapered microstructures or a plurality of cone-like microstructures. The tips of these microstructures are, for example, a light guide or a back light guide. In an embodiment of the invention, the plurality of microstructures are a plurality of pyramid-type microstructures or a plurality of triangular pyramid microstructures. In an embodiment of the invention, the plurality of microstructures are regularly arranged or irregularly arranged. In an embodiment of the invention, the plurality of microstructures are at least partially connected. In an embodiment of the invention, the plurality of microstructures are not connected to each other. In one embodiment of the invention, each of the reflective surfaces of each of the microstructures is a smooth planar or rough surface. In an embodiment of the invention, the backlight module further includes an optical sheet set disposed above the light emitting surface of the light guide plate. Based on the above, since the backlight module of the present invention has a micro-structured reflector, the angle of light entering the light guide plate can be changed, so that the light guide 6 201100924'(4) 30883twf.doc/n can be improved at an angle suitable for the optical film group. Light extraction efficiency. The above described features and advantages of the present invention will become more apparent from the description of the appended claims. Embodiment 2 FIG. 2 is a schematic diagram of a backlight module according to an embodiment of the present invention. Referring to FIG. 2, the moonlight module 200 includes a light guide plate 21, a reflector 220, a light source 230, and a sac substrate 240. 〇 The light guide plate 210 has a light incident surface 210a, a light emitting surface 210b, and a bottom surface 210c. The light-emitting surface 210b faces the bottom surface 210c, and the light-incident surface 210a is connected between the light-emitting surface 210b and the bottom surface 210c. The light source 230 faces the light incident surface 210a' of the light guide plate 210, and the light source 230 supplies light L to be incident on the light incident surface 21A. The reflector 220 is disposed under the bottom surface 21c of the light guide plate 21〇. The reflector 220 has a plurality of microstructures 222 on one side of the bottom surface 2i〇c of the light guide plate 210. Each of the microstructures 222 has a plurality of reflective surfaces 222a, and each of the reflective surfaces 222a is not parallel to the light exiting surface 21〇b of the light guide plate 210 to reflect the light. In other words, each of the reflective surfaces 222a is a sloped slope in the backlight module 200. In the present embodiment, the reflective surface 222a of each of the above microstructures 222 is a flat or rough surface. In the present embodiment, it is preferable that the light L of the backlight module 200 is concentrated in the front view direction D. The front view direction D refers to the line of sight direction in which the user views the display to which the backlight module 200 is applied. Here, the front view direction D is substantially perpendicular to the light exit surface 21〇b of the light guide plate 210. However, in other display designs, the front view direction D may not be perpendicular to the light exit surface 21b. 201100924 -0885 30SS3twf.doc/n In the backlight module 200, the incident angle α1 and the reflection angle α2 which are present when the light L is incident on the reflective surface 222a of the reflecting plate 220 are as shown in FIG. Since each of the reflecting surfaces 222a is an inclined slope, the traveling direction of the light L reflected by the reflecting surface 222a will approach the frontal direction 〇. That is to say, the design of the backlight module 200 allows the light L to be concentrated in the front view direction D with better light extraction efficiency. In addition, the backlight module 200 further includes a protection substrate 240 and an optical sheet group 250. The protective substrate 240 is disposed on the microstructure 222 of the reflective plate 220, and the optical sheet assembly 25 is disposed above the light guide plate 210. The arrangement of the protective substrate 240 prevents the microstructures 222 on the reflective plate 220 from coming into direct contact with the light guide plate 210 to cause damage to the microstructures 222 and the light guide plate 210. Specifically, the material of the protective substrate 240 may be a transparent substrate material. In the present embodiment, the plurality of microstructures 222 of the reflector 220 have a light transmissive material 242' and the light transmissive material 242 is located in the enclosed space between the protection substrate 240 and the reflector 220. In another embodiment, the light transmissive material 242 may be layered on the plurality of microstructures 222 to provide protection for the microstructures 222. Further, the light transmissive material 242 may have a refractive index greater than or equal to one. For example, light transmissive material 242 can comprise a transparent material or air or photoresist. Further, in order to improve the brightness uniformity of the backlight module 200, the optical sheet group 250 may be disposed to uniformize the light L provided by the entire backlight module 2〇〇. The optical sheet set 250 preferably allows the light emitted by the light source 230 to diffuse' and maintain the brightness of the light L emitted by the entire backlight module 200 without damaging the intensity of the light source 230. 201100924 a ... "206-0885 30883twfdoc / n In the backlight module 200, the optical sheet set 250 can use, for example, a diffuser (Diffuser), a brightness enhancement film (BEF) or a double brightness enhancement film (DBEF). The combination of optical films, etc. The optical sheet set 25〇 with the reflecting plate 220 can effectively achieve the purpose of uniformity and concentration of light. Of course, the present invention does not limit the number or type of optical films used in the optical sheet set 250, The general knowledge is designed to be matched as needed. Next, the microstructure design proposed by the present invention will be further described. ❹ Figures 3(8) to (4) are each a schematic diagram of the microstructure of the present invention. The single microstructure 222 of the reflector 220 is as shown in FIG. 3 (8). Referring to FIG. 2 and FIG. 3 (8) simultaneously, in the plurality of reflective surfaces 222a of the microstructure 222, each reflective surface 222a has a top angle ^ and two bottoms. The intersection angle θ2 'top parent angle Θ! points to the protective substrate 240 or away from the protective substrate, and the two intersection angles θ2 are respectively adjacent to the top intersection angle 01. More specifically, the sides of the microstructures 222 are mailed to each other. 222b $-straight line, and any two adjacent ones are disrespectful. In this embodiment, the above view _^130 ❹, and in other embodiments, the apex angle may be between 12 〇 and 155. 222c 222 Γ 反射 反射 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The brightness enhancement effect ^ is in the middle. In order to make the lifting procedure easier, the bottom angle can be made different. For example, the reflection surface 222a of the embodiment is such that the bottom edge is separated from the side edge 222b. The bottom machine = 9 9883 twf.doc / n 201100924 » «^ vw ** 〇 δ δ ^ However, the present invention is not limited to the reflecting surface 222a is an isosceles triangle, in another embodiment, the reflecting surface 222a can also Referring to FIG. 2 and FIG. 3( a ), since each reflecting surface 222 a of the reflecting plate 220 is an inclined inclined surface, the light L emitted from the light source 23 is reflected by the reflecting surface 222 a and can be oriented toward the front side. The direction D is concentrated. Therefore, for the user, the backlight module 2 is compared with the conventional one under the design of the light source 230 of the same specification. The backlight module 100 having the reflecting plate 120 can obtain brighter light in the front view direction D. In other words, the brightness of the backlight can be effectively raised without changing the H specification or increasing the brightness of the brightening wire. Membrane. In the present embodiment, the microstructure 222 of the reflector 220 is a quadrangular pyramid microstructure, which is, for example, a pyramid-type microstructure. In other words, each of the reflective surfaces 222a of the microstructure = is a plane of a triangle. The top of the composition of the micro-factory 222 has a vertex recommendation. In other embodiments of the invention, the top of the microstructure 222 may not be a vertex but a plane or always = Figure 3 (6). For example, in Fig. 3(b), the microstructure is corrected to a planar top surface, and at the top is, for example, a ridge 2223d. Here, the microstructure 222 2223 shown in FIG. 3(b) and FIG. 3(c) is not a quasi-corner shape, so the present invention is referred to as a cone-like microstructure. These cone-like multiple oblique reflecting surfaces are taken in the direction of reflection by reflection. That is to say, the structure 2221 of _ and _ ^ also helps to improve the positive mode of the backlight mode. 201100924 2U6-0885 30883twf.doc/n In another embodiment, the microstructure of the reflector can be as shown in FIG. (Triangle tapered microstructure 2225 as shown in Fig. 2. In other embodiments, the microstructure 222 of the reflector may also be a triangular pyramid-like microstructure 2227 as shown in Fig. 3(e). The microstructure is merely illustrative, and the invention is not limited to the tapered microstructure or conical-like microstructure shown in Figures 3(a)-(e). In other embodiments, the microstructure 222 may be other A polygonal pyramid structure or a polygonal pyramid-like microstructure, etc. Fig. 4 is a schematic view of a reflector according to an embodiment of the invention. Referring to Fig. 2 and Fig. 4, in the backlight module 20, a plurality of reflectors 220 The tips of the microstructures 222 are directed to the light guide plate 210' and the plurality of microstructures 222 are regularly arranged. In another embodiment not shown, the plurality of microstructures 222 may also be designed to be irregularly arranged. The plurality of microstructures 222 are connected to each other. In another embodiment, the light weight group 200 can be as shown in FIG. The reflective plate 320 is shown in which a plurality of microstructures 222 are partially connected. In still another embodiment, the backlight module 200 can adopt a reflective plate 420 as shown in FIG. 6, wherein the plurality of microstructures 222 are ❹ each other. In addition, the backlight module 200 can also adopt a reflector 520 as shown in FIG. 7 , wherein the plurality of microstructures 222 are, for example, fan-shaped. In other embodiments, the backlight module 200 can also be configured as shown in FIG. 8 . The reflecting plate 620 is shown, wherein the tips of the plurality of microstructures 622 are the back light guiding plate 210. That is, the plurality of microstructures 622 are recessed into the interior of the reflecting plate 620. Similarly, the plurality of concave reflecting plates 62〇 The microstructures 622 may be connected or connected to each other except that they may not be connected to each other. In addition, the microstructures 622 may be arranged regularly or irregularly. 11 201100924 j-0885 30883nvf.doc/n Figure 9 For the conventional backlight module, the light extraction rate test results are shown in different viewing angles. Figure 10 is a backlight module of the present invention, and the light extraction rate test results are not intended at different viewing angles. 9 and Figure 10, where the curve 7〇1 table The light extraction rate of the conventional backlight module at different azimuth angles; the curve 702 represents the light extraction rate of the conventional backlight module at different elevation angles; the curve indicates the light extraction rate of the backlight module of the present invention in different orientations; And, the curve indicates the light extraction rate of the backlight module of the present invention at different elevation angles. Although, the S-curve, the line 〇2, 802, the illuminator and the backlight module of the present invention have a light extraction rate of minus 15 Degree concentration 'but from the curve 7m, the view can be seen, the month of the month, the group 'the light extraction rate in different azimuths will have a significant mention if the 疋 'this day (four) backlight surface in the orientation The highest light extraction rate is at an angle of 45 degrees. The structure irtu is in the backlight module of the invention, and the reflector has the backlight module of the invention of the second and second invention, which can illuminate the light and improve the light of the high brightness of different angles of view. In addition, the addition of the plate can be called a scaly material, and contribute to the increase of the text:: This has been disclosed in the above embodiment, but it is not intended to limit the general knowledge of the technical field, Taking off the _1 of the invention, lilt7 can make some changes and refinements, so it is accurate. (5) The definition of the patent application scope attached to Tianshi is [Simplified illustration] 12 201100924 206-0885 30883twf.doc/i FIG. 1 is a schematic diagram of a conventional backlight module. 2 is a schematic diagram of a backlight module according to an embodiment of the invention. 3(a) to (e) are each a schematic view of a microstructure of an embodiment of the present invention. 4 is a schematic view of a reflector according to an embodiment of the invention. FIG. 5 is a schematic view of a reflector according to an embodiment of the invention. FIG. 6 is a schematic view of a reflector according to an embodiment of the invention. FIG. 7 is a schematic view of a reflector according to an embodiment of the invention. FIG. 8 is a schematic view of a reflector according to an embodiment of the invention. FIG. 9 is a schematic diagram showing the results of light extraction rate test of a conventional backlight module at different viewing angles. Fig. 10 is a view showing the results of light extraction rate test of the backlight module 'of the present invention at different viewing angles. [Main component symbol description] 100, 200: backlight module 110, 210: light guide plate 11.0a, 210a: light incident surface 110b, 210b: light emitting surface 110c, 210c: bottom surface 120, 220, 320, 420, 520, 620 Reflector plates 222, 622, 2221, 2223, 2225, 2227: microstructures 120a, 222a: reflective surfaces 130, 230: light source 240: protective substrate 13 201100924 0885 30883twf.doc/n 242: light transmissive material 250: optical sheet group D: front view direction L: light αΐ: incident angle α2: reflection angle: top angle θ2: bottom angle 701, 702, 801, 802: curve 14