201122574 19TW(I) 33042twf.doc/n 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—種具 有高的光利用效率的導光板（Light :Guide Panel, LGP )。 【先前技術】 諸如側面入光式液晶顯示器的背光模組、及照明設備 φ 等都會使用到導光板。近年來，更將導光板使用在各種電 子裝置中，以將色彩、光線等設計元素導入到電子裝置的 外觀中。 圖1為習知的一種導光板的立體示意圖。在圖1中標 示了第一方向D1與第二方向〇2,其中，第一方向D1可 理解為導光板100的後方（下方側），第二方向D2可理 解為導光板100的前方（上方側）。請參照圖丨，在導光 板1〇〇對應電子裝置的元件（未繪示）的位置處通常設置 有貫孔110，使得能夠將導光板100安裝到電子裝置（未 繪示）中。然而，貫孔110會遮蔽在導光板1〇〇中傳導的 光線L，造成在貫孔110的後方產生暗帶。 圖2為習知的另一種導光板的示意圖。為解決圖1的 導光板100的暗帶問題，如圖2所示，提出另___種導光板 l〇〇a。在導光板1〇〇&上，於貫孔11〇的右上角進一步設置 貝孔122、或者挖出較大的空間（如三角形或矩形等）。如 此一來，在導光板100中傳導的光線L會被貫孔122的周 邊所折射、而到達貫孔11〇的後方。因此，貫孔110周圍 201122574 -W(I) 33042twf.doc/n 會有增壳的效果以消除暗帶。然而，導光板l〇〇a仍有以下 問題，亦即，光線L會從貫孔122出射到導光板i〇〇a之 外，仍會造成光線L的損失。 * 一 · ·♦ 〇· 【發明内容】 有鑑於此，本發明提供一種導光板，具有高的光利用 效率。 本發明提供-種背光模組，具有上述的導光板，能提 供均勻的面光源。 本發明提供一種傳導光線的方法，能解決因導光板中 的貫孔所產生之暗帶問題。 基於上述’本發明提出一種導光板。此導光板具有底 面、與底面相對的出光面、及連接底面與出光面的入光面。 入光面而在導光板中進行傳導。導光板包括: 透先基板u槽。透綠板具有至少—貫孔。第一溝 槽設置於透光基板上、且位於貫孔的周圍。 導光底^出盘種背光模組’包括：導光板以及光源。 導先板具有底Φ、與底面姆的 光面的人光面。導光板故m 錢縣面與出 ==一:孔。第-溝槽設基=:= ==面==於入光面的-側。光源提供光線 進入上迷入光面而在導光板中進行傳導。 在本發明的一實施例中， 的區域形成為-㈣導光部， 201122574 yj^Lwyl 9T W (I) 33042twf. doc/n 射、而自貫孔周圍之透光基板的出光面與底面方向出光。 在本發明的一實施例中，上述的第一溝槽的剖面形狀 包括半圓形、四邊形、三角形或梯形。 在本發明的一實施例中，上述的導光板更包括第二溝 槽，設置於透光基板上、且位於第一溝槽的周圍。， 在本發明的—實施例中，上述的貫孔的形狀包括圓 形、橢圓形、三角形、多邊形或不規則形。 在本發明的一實施例中，上述的第-溝槽的形狀與貫 孔的形狀相同。 在本發明的一實施例中，上述的第一溝槽設置於導光 板的底面或出光面。 在本發明的一實施例中，上述的背光模組更包括一反 射片，5免置於導光板的底面的一側。 在本發明的—實施例中，上述的光源包括發光二極體 陣列。 一本發明再提出一種傳導光線的方法。首先，提供一導 光，此導光板具有至少—貫孔。接著，於貫孔的周圍設 置溝槽，使第一溝槽與貫孔之間的區域形成為一内圍 導，。卩，其中，進入導光板進行傳導的光線在内圍導光部 進打折射’而自貫孔周圍的上下方向出光。 a .在本發明的一實施例中，上述的傳導光線的方式可以 在導光板進行傳導的光線通過第一溝槽處、未切斷的 V光板，而進入到内圍導光部進行折射，以於貫孔的周圍 的上下方向出光。 201122574 x W(I) 33042twf.d〇c/n 在本發明的一實施例中，上述的傳導光線的方式可以 是：在導光板進行傳導的光線射出導光板而進入第一溝 槽，隨即從第一溝槽進入到内圍導光部進行折射，以於貫 孔的周圍的上下方向出光。 在本發明的一實施例中，上述的傳導光線的方式可以 是：更包括提供一反射片，設置在導光板的一側’其中， 在導光板進行傳導的光線射出導光板往反射片行進’且經 由反射片所反射的光線進入到内圍導光部進行折射，以於 貫孔的周圍的上下方向出光。 本發明的導光板在貫孔的周圍設置第一溝槽，所以能 多句在貫孔與第一溝槽之間形成内圍導光部。因此，在光線 經過貫孔之前、即可以將光線傳導到貫孔的後方，而不需 另外增加貫孔。結果是’能夠解決貫孔後方的暗帶問題， 且月b 汁光線的利用效率。 —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】 本發明的導光板具有高的光利用效率，且能解決因貫 孔所造成的暗帶問題以下，舉出幾個較佳實施例來說明 本發明的導光板的技術特點。另外，在以下的圖式中標示 了第了方向D1與第二方向说，其中，第—方向以可理 解為導^板的後方（下方側），第二方可理解為導 光板的則方（上方側）。在導光板中傳輸的光線-般是自 201122574 vjhi υ?υ 19TW(I) 33042twf.doc/n 導光板的前方（即第二方向D2)出射的。 圖3為本發明較佳實施例的一種導光板的立體示意 圖。請參照圖3 ’導光板200具有底面200a、與底面200a 相對的出洗面200b、及連接底面20〇a與出光面200b的入乂 光面200c。光線L可自入光面200c進入導光板200而在 導光板200中進行傳導。在圖3中僅以左側方的一面作為 入光面200c進行說明’實際上’連接在底面2〇〇a與出光 面200b之間的另外三個表面也可作為入光面2〇〇c。 請繼續參照圖3，導光板200包括：透光基板21〇與 第一溝槽220。透光基板210具有至少一貫孔212(圖中繪 示4個）。第一溝槽220設置於透光基板21〇上、且位於 貫孔212的周圍。由於在貫孔212的周圍設置了第一溝槽 220，所以在光線L經過貫孔212之前，光線l即可被傳 導到貫孔212的後方，使得貫孔212附近的區域增亮，可 解決暗帶問題。 圖4為圖3的貫孔與第一溝槽的放大示意圖。可知 道，圖4的出紙面方向為第一方向di、入紙面方向為第— 方向D2。請同時參照圖3與圖4理解第一溝槽22〇的作 用，也就是說，第一溝槽220與貫孔212之間的區域形成 為内圍導光部230，光線L在内圍導光部230進行折射而 於導光基板210貫孔212周圍的出光面出光。換言之， 線L會往第一方向D1與第二方向£>2出光。 “ 更詳細而言，設置在貫孔212周圍的第一溝槽2扣 導光板210劃分出内圍導光部230。第一溝槽22〇中充滿 7 201122574 33042twf.doc/n 了空氣作為介質。如圖4所示，在導光板210中傳導的光 線L·在進入貫孔212之前可先進入第一溝槽220。繼而， 光線L會再從第一溝槽220入射到内圍導光部230。結果 是’。光線L會在内圍導光部230内進行反覆的反射與折 射’最終自貫孔212周圍之透光基板210的出光面2〇〇b 與底面200a的方向出光。另外，如圖3與圖4所示，第一 溝槽220例如是設置於導光板210的底面200a。另外，第 一溝槽220也可以設置於導光板210的出光面2〇〇b。 在圖3與圖4的實施例中，貫孔212的形狀是以圓形 來例示。然而’在另外的實施例中，貫孔212的形狀還可 以是橢圓形、三角形、多邊形或不規則形。本發明並不限 疋貫孔212的形狀。另外，第一溝槽220的形狀可與貫孔 212的形狀進行適當的搭配。在一實施例中，可以使第一 溝槽220的形狀（輪廓）與貫孔212的形狀相同，或者， 也可使第一溝槽220的形狀與貫孔212的形狀不同。 圖5為本發明較佳實施例的四種貫孔與導光圖案的配 置方式的立體示意圖。圖6A〜圖6D則為沿著圖5的^ 線的剖面示意圖。從圖5之圖面的左上方自右下方分別表 示圖6A〜圖6D所示的四種貫孔與導光圖案的配置方式。 此處疋以貝孔212為圓形為例進行說明。然而，如上所述， 貫孔212的形狀可有多種變化，且導光圖案亦可 的形狀而進行調整。 如圖5與圖6A所示，第一種的貫孔212與第一 220的配置方式是：貫孔212為圓形，且第_溝槽加^ 201122574 vji^i \jy\j 19TW(I) 33042twf. doc/n 剖面形狀為半圓形。 如圖5與圖6B所示，第二種的貫孔212與第一溝槽 220的配置方式是：貫孔212為圓形，且第一溝槽220的 剖面形狀為四邊形。 一 如圖5與圖6C所示，第三種的貫孔212與第一溝槽 220的配置方式是：貫孔212為圓形，且第一溝槽220的 剖面形狀為三角形。 如圖5與圖6D所示，在此實施例中，導光板200可 更包括第二溝槽222 ’設置於透光基板210上、且位於第 一溝槽220的周圍。此第四種的貫孔212、第一溝槽220、 第二溝槽222的配置方式是：貫孔212為圓形，且第一溝 槽220與第二溝槽222的剖面形狀為四邊形。 上述的圖5以及圖6A〜圖6D僅為舉例。實際上，可 依照設計需求而變化貫孔212形狀（圓形、橢圓形、三角 幵;^、多邊形或不規則形）、第一溝槽220的剖面形狀（半 圓形、四邊形、三角形或梯形）、調整第一溝槽22〇本身 的數量’或是另外增設第二溝槽222等。 亦即，可如圖3所示，在一個導光板2〇〇上僅使用一 種的貫孔212與第一溝槽220的配置方式；或是，也可如 圖5所示，在一個導光板2〇〇上使用數種的貫孔212與第 一溝槽220 (第二溝槽222 )的配置方式。本發明並不限制 貫孔212、第一溝槽220、第二溝槽222的形狀、剖面形狀、 數量或搭配方式。 圖7為本發明較佳實施例的一種背光模組的示意圖。 201122574 vji-i 1 W(I) 33042twf.d〇c/n 請參照圖7 ’此背光模組300包括：導光板31〇以及光源 320。導光板310可以使用上述圖3〜圖6所示的導光板 200，相同的元件標示以相同的符號，且不重述相同的内 容。值得注意的是，導光板-310具有多個貫孔212、且在 貫孔212的周圍設置了第一溝槽220。光源320設置於入 光面200c的一側。光源320提供光線L進入上述入光面 200c而在導光板310中進行傳導。 請繼續參照圖7 ’背光模組3〇〇可更包括一反射片 330 ’設置於導光板310的底面2〇〇a的一侧。如此，從貫 孔212出射的光線L、以及經由内圍導光部23〇反覆折射 與反射、而在貫孔212的下方向出射的光線L，均可被反 射片330反射而從導光板200的出光面2〇〇b出射。另外， 上述的光源320可以採用發光二極體陣列或是其他合適的 光源，本發明並不限定所使用的光源320的種類。 上述的導光板200與背光模組3〇〇可應用在各種電子 裂置或照明設備等中’如鍵盤、電腦機殼、顯示器等的機 構平面上具有孔、洞、不規則空間或者貫孔，且需經由導 光板導出光線者’都可應用本發明的導米板2〇〇。 以鍵盤為例來說明導光板210的應用方式。鍵盤（未 繪示）具有多個按鍵（未繪示）。可將具有多個貫孔212 的導光板210安裝在按鍵的下方，且使按鍵對應於貫孔 212。如此一來，即可在鍵盤中導入色彩、光線等設計元素， 使鍵盤的外觀更具有吸引力，並且，利用在貫孔212周圍 設置第一溝槽220，可以消除貫孔212後方所產生的暗紋。 201122574 ^^»v^l9TW(I) 33042twf.doc/n 圖8為本發明較佳實施例的一種傳導光線的方法的流 程圖。請同時參照圖3與圖8來理解本發明的傳導光線的 方法。首先，在步驟S401中，提供導光板200，此導光板 2〇〇具有至少一貫孔212。 接著，在步驟S402中，於貫孔212的周圍設置第一 溝槽220，使第一溝槽22〇與貫孔212之間的區域形成為 一内圍導光部230，其中，進入導光板2〇〇進行傳導的光 線L在内圍導光部230進行折射’於貫孔212的周圍出光。 圖9〜圖11為在圖7的背光模組中、光線進行傳導的 數種方式的立體示意圖。請先參照圖9 ’從導光板31〇的 入光面200c入射的光L，在導光板310中產生全反射而行 進。特別是，光線L通過第一溝槽220處、未切斷的導光 板310 ’而進入到内圍導光部23〇。進入到内圍導光部230 的光線L繼續進行反射與折射，而到達貫孔212的後方。 繼而’光線L在貫孔212的周圍的上下方向出光’亦即， 從導光板310的底面200a與出光面200b出光。 請再參照圖10 ’從導光板310的入光面200c入射的 光L ’在導光板310中產生全反射而行進。特別是，光線 L射出導光板310而進入第一溝槽220，隨即從第一溝槽 220進入到内圍導光部230。進入到内圍導光部230的光線 L繼續進行反射與折射，而到達貫孔212的後方。繼而， 光線L在貫孔212的周圍的上下方向出光，亦即，從導光 板310的底面200a與出光面200b出光。 請再參照圖11，從導光板310的入光面200c入射的 11 201122574 33042twf.d〇C/n 光L ’在導光板310中產生全反射而行進。特別是，光線 L射出第—溝槽220而往反射片330行進。經由反射片330 反射的光線L再進入到内圍導光部230。入射到内圍導光 部°230的光線l繼讀進行反射與折射，而到達貫孔:212的 後方。繼而，光線L在貫孔212的周圍的上下方向出光， 亦即’從導光板310的底面2〇〇a與出光面2〇〇b出光。 另外，如圖9〜11所示’反射片330也可具有貫孔 332 ’以利於電子元件（未繪示）的設置。當然，反射片 330是否具有貫孔332是根據設計需求而定，本發明並不 限制。 綜上所述’本發明的導光板、背光模組以及傳導光線 的方法至少具有以下優點： 光線在導光板中的傳導是藉由反射與折射定律。無論 遇到何種形狀的貫孔時，必定會達到某種程度的衰減，造 成貝孔後方有暗帶的形成。然而，本發明利用第一溝槽設 置在貫孔的周圍，且形成内圍導光部。在光線經過貫孔之 前，上述設計即可將光線傳導到貫孔的後方或是在貫孔周 圍的上下方向出光，如此一來，可解決暗帶問題，並能提 昇光線的使用效率。 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，任何所屬技術領域中具有通常知識者，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，故本 發明之保護範圍當視後附之申請專利範圍所界定者為準。 12 201122574 uLiuyu!9TW(I) 33042twf.doc/n . 【圖式簡單說明】 圖1為習知的一種導光板的立體示意圖。 - 圖2為習知的另一種導光板的示意圖。 斷3為本發明較佳實施例的一種導光板的立體示音、 圖4為圖3的貫孔與第一溝槽的放大示意圖。 圖5為本發明較佳實施例的四種貫孔與導光圖案的配 置方式的立體示意圖。 〃 • 圖6A〜圖6D則為沿著圖5的I-Ι線的剖面示意圖。 圖7為本發明較佳實施例的一種背光模組的示意圖。 圖8為本發明較佳實施例的一種傳導光線的方法的流 程圖。 圖9〜圖11為在圖7的背光模組中、光線進行傳導的 數種方式的立體示意圖。 【主要元件符號說明】 • 100、100a :導光板 110、122、124 :貫孔 200 :導光板 200a :底面 200b :出光面 200c :入光面 210 :透光基板 212、332 :貫孔 13 201122574W(I) 33042twf.doc/n 220 :第一溝槽 222 :第二溝槽 230 :内圍導光部 300 :背光模組 310 :導光板 320 :光源 330 :反射片 S401、S402 :步驟 D1 :第一方向 D2 :第二方向 L :光線201122574 19TW(I) 33042twf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a light guide plate, and more particularly to a light guide plate having high light utilization efficiency (Light: Guide Panel, LGP). [Prior Art] A backlight module such as a side-input type liquid crystal display, and a lighting device φ, etc., all use a light guide plate. In recent years, light guide plates have been used in various electronic devices to introduce design elements such as color and light into the appearance of an electronic device. FIG. 1 is a schematic perspective view of a conventional light guide plate. The first direction D1 and the second direction 〇2 are indicated in FIG. 1, wherein the first direction D1 can be understood as the rear (lower side) of the light guide plate 100, and the second direction D2 can be understood as the front of the light guide plate 100 (above side). Referring to the figure, a through hole 110 is generally provided at a position of a light guide plate 1 corresponding to an element (not shown) of the electronic device, so that the light guide plate 100 can be mounted in an electronic device (not shown). However, the through hole 110 shields the light L conducted in the light guide plate 1 to cause a dark band to be generated behind the through hole 110. 2 is a schematic view of another conventional light guide plate. In order to solve the dark band problem of the light guide plate 100 of FIG. 1, as shown in FIG. 2, another type of light guide plate l〇〇a is proposed. On the light guide plate 1 〇〇 &, a hole 24 is further provided in the upper right corner of the through hole 11 、, or a large space (such as a triangle or a rectangle) is scooped out. As a result, the light L conducted in the light guide plate 100 is refracted by the periphery of the through hole 122 to reach the rear of the through hole 11'. Therefore, around the through hole 110 201122574 -W(I) 33042twf.doc/n there is a shelling effect to eliminate the dark band. However, the light guide plate 10a still has the problem that the light L is emitted from the through hole 122 to the outside of the light guide plate i〇〇a, and the loss of the light L is still caused. * 一 · · ♦ 〇 · [Invention] In view of the above, the present invention provides a light guide plate having high light utilization efficiency. The invention provides a backlight module having the above-mentioned light guide plate, which can provide a uniform surface light source. The present invention provides a method of conducting light that solves the problem of dark bands caused by through holes in a light guide plate. A light guide plate is proposed based on the above invention. The light guide plate has a bottom surface, a light exit surface opposite to the bottom surface, and a light incident surface connecting the bottom surface and the light exit surface. Conducting in the light guide plate while entering the light surface. The light guide plate comprises: a through substrate u-slot. The transparent plate has at least a through hole. The first trench is disposed on the transparent substrate and located around the through hole. The light guide bottom plate is provided with a light guide plate and a light source. The guiding plate has a human light surface with a bottom Φ and a smooth surface. Light guide plate so m money county face and out == one: hole. The first groove is set to base =: = = = face = = on the - side of the light incident surface. The light source provides light into the glazed surface and conducts in the light guide. In an embodiment of the invention, the region is formed as a - (four) light guiding portion, 201122574 yj^Lwyl 9T W (I) 33042 twf. doc / n, and the light emitting surface and the bottom surface direction of the transparent substrate around the through hole sold out. In an embodiment of the invention, the cross-sectional shape of the first trench includes a semicircle, a quadrangle, a triangle or a trapezoid. In an embodiment of the invention, the light guide plate further includes a second groove disposed on the transparent substrate and located around the first groove. In the embodiment of the present invention, the shape of the through hole described above includes a circle, an ellipse, a triangle, a polygon, or an irregular shape. In an embodiment of the invention, the shape of the first groove is the same as the shape of the through hole. In an embodiment of the invention, the first trench is disposed on a bottom surface or a light exit surface of the light guide plate. In an embodiment of the invention, the backlight module further includes a reflective sheet, and 5 is disposed on a side of the bottom surface of the light guide plate. In an embodiment of the invention, the light source comprises an array of light emitting diodes. A method of conducting light is also proposed in the present invention. First, a light guide is provided, the light guide plate having at least a through hole. Next, a groove is provided around the through hole so that a region between the first groove and the through hole is formed as an inner guide. In other words, the light that is conducted into the light guide plate is refracted by the inner light guiding portion and is emitted from the upper and lower directions around the through hole. In an embodiment of the present invention, the light-transmitting means can pass the light guided by the light guide plate through the first groove, the uncut V-plate, and enter the inner light guide to refract. Light is emitted in the up and down direction around the through hole. 201122574 x W(I) 33042twf.d〇c/n In an embodiment of the invention, the method for conducting light may be: the light conducted by the light guide plate is emitted from the light guide plate into the first groove, and then The first groove enters the inner circumference light guiding portion to be refracted to emit light in the vertical direction around the through hole. In an embodiment of the present invention, the method for conducting light may further include: providing a reflective sheet disposed on one side of the light guide plate, wherein light guided by the light guide plate exits the light guide plate and travels toward the reflective sheet. The light reflected by the reflection sheet enters the inner circumference light guiding portion and is refracted to emit light in the vertical direction around the through hole. Since the light guide plate of the present invention is provided with the first groove around the through hole, a plurality of inner light guiding portions can be formed between the through hole and the first groove. Therefore, the light can be conducted to the rear of the through hole before the light passes through the through hole without additional need to increase the through hole. The result is that it can solve the dark band problem behind the through hole and the utilization efficiency of the moon b juice light. The above-described features and advantages of the present invention will become more apparent from the following description. [Embodiment] The light guide plate of the present invention has high light use efficiency and can solve the dark band problem caused by the through holes. Hereinafter, several preferred embodiments will be described to explain the technical features of the light guide plate of the present invention. In addition, in the following drawings, the first direction D1 and the second direction are indicated, wherein the first direction can be understood as the rear (lower side) of the guide plate, and the second side can be understood as the square of the light guide plate. (upper side). The light transmitted in the light guide plate is generally emitted from the front of the light guide plate (i.e., the second direction D2) of 201122574 vjhi υ?υ 19TW(I) 33042twf.doc/n. Figure 3 is a perspective view of a light guide plate in accordance with a preferred embodiment of the present invention. Referring to Fig. 3, the light guide plate 200 has a bottom surface 200a, a wash surface 200b facing the bottom surface 200a, and a light incident surface 200c connecting the bottom surface 20a and the light exit surface 200b. The light L can enter the light guide plate 200 from the light incident surface 200c to be conducted in the light guide plate 200. In Fig. 3, only the left side is used as the light incident surface 200c. The other three surfaces which are actually connected between the bottom surface 2〇〇a and the light exit surface 200b can also be used as the light incident surface 2〇〇c. Referring to FIG. 3, the light guide plate 200 includes a transparent substrate 21 and a first trench 220. The light-transmitting substrate 210 has at least a uniform hole 212 (four in the figure). The first trench 220 is disposed on the transparent substrate 21A and located around the through hole 212. Since the first trench 220 is disposed around the through hole 212, the light 1 can be transmitted to the rear of the through hole 212 before the light L passes through the through hole 212, so that the area near the through hole 212 is brightened, which can be solved. Dark belt problem. 4 is an enlarged schematic view of the through hole and the first groove of FIG. 3. It can be seen that the paper exiting direction of Fig. 4 is the first direction di and the paper feed surface direction is the first direction D2. Please refer to FIG. 3 and FIG. 4 simultaneously to understand the action of the first trench 22, that is, the region between the first trench 220 and the through hole 212 is formed as the inner light guiding portion 230, and the light L is guided inside. The light portion 230 is refracted to emit light on the light exit surface around the through hole 212 of the light guide substrate 210. In other words, the line L will emit light in the first direction D1 and the second direction £>2. "In more detail, the first groove 2 disposed around the through hole 212 is fastened by the light guide plate 210 to define the inner circumference light guiding portion 230. The first groove 22 is filled with the space 7 201122574 33042twf.doc/n air as a medium As shown in FIG. 4, the light L· conducted in the light guide plate 210 may enter the first trench 220 before entering the through hole 212. Then, the light L will be incident from the first trench 220 to the inner circumference light guide. The result is '. The light L is reflected and refracted repeatedly in the inner light guiding portion 230. Finally, the light exiting surface 2b of the transparent substrate 210 around the through hole 212 and the direction of the bottom surface 200a are emitted. In addition, as shown in FIG. 3 and FIG. 4, the first trench 220 is disposed on the bottom surface 200a of the light guide plate 210. The first trench 220 may be disposed on the light exit surface 2b of the light guide plate 210. In the embodiment of Figures 3 and 4, the shape of the through hole 212 is exemplified by a circle. However, in other embodiments, the shape of the through hole 212 may also be elliptical, triangular, polygonal or irregular. The present invention is not limited to the shape of the through hole 212. In addition, the shape of the first groove 220 and the through hole 212 The shape is appropriately matched. In an embodiment, the shape (profile) of the first groove 220 may be the same as the shape of the through hole 212, or the shape of the first groove 220 may be the same as that of the through hole 212. Figure 5 is a perspective view showing the arrangement of four types of through holes and light guiding patterns according to a preferred embodiment of the present invention. Figs. 6A to 6D are schematic cross-sectional views along line of Fig. 5. The upper left side of the drawing shows the arrangement of the four through holes and the light guiding pattern shown in FIG. 6A to FIG. 6D from the lower right side. Here, the description will be made by taking the bell hole 212 as a circular shape as an example. However, as described above. The shape of the through hole 212 can be variously changed, and the shape of the light guiding pattern can be adjusted. As shown in FIG. 5 and FIG. 6A, the first through hole 212 and the first 220 are arranged in a through hole. 212 is a circle, and the first groove + ^ 201122574 vji ^ i \ jy \ j 19TW (I) 33042twf. doc / n cross-sectional shape is semi-circular. As shown in Figure 5 and Figure 6B, the second type The hole 212 and the first groove 220 are arranged in such a manner that the through hole 212 is circular, and the cross-sectional shape of the first groove 220 is a quadrangle. As shown in FIG. 5 and FIG. 6C, the third through hole 212 and the first groove 220 are arranged in such a manner that the through hole 212 is circular, and the cross-sectional shape of the first groove 220 is triangular. As shown in FIG. 6D, in this embodiment, the light guide plate 200 may further include a second trench 222' disposed on the transparent substrate 210 and located around the first trench 220. The fourth type of through hole 212, the first A trench 220 and a second trench 222 are disposed in such a manner that the through hole 212 is circular, and the cross-sectional shape of the first trench 220 and the second trench 222 is quadrangular. 5 and 6A to 6D described above are merely examples. In fact, the shape of the through hole 212 (circular, elliptical, triangular, ^, polygonal or irregular), the cross-sectional shape of the first groove 220 (semicircular, quadrangular, triangular or trapezoidal) can be changed according to design requirements. ), adjusting the number of the first trench 22 〇 itself or adding a second trench 222 or the like. That is, as shown in FIG. 3, only one type of through hole 212 and the first groove 220 are disposed on one light guide plate 2''; or, as shown in FIG. 5, a light guide plate. The arrangement of the plurality of through holes 212 and the first grooves 220 (second grooves 222) is used. The present invention does not limit the shape, cross-sectional shape, number, or manner of the through holes 212, the first grooves 220, and the second grooves 222. FIG. 7 is a schematic diagram of a backlight module according to a preferred embodiment of the present invention. 201122574 vji-i 1 W(I) 33042twf.d〇c/n Please refer to FIG. 7'. The backlight module 300 includes a light guide plate 31A and a light source 320. For the light guide plate 310, the light guide plate 200 shown in FIG. 3 to FIG. 6 described above may be used, and the same components are denoted by the same reference numerals, and the same reference numerals are not repeated. It should be noted that the light guide plate 310 has a plurality of through holes 212, and a first groove 220 is disposed around the through holes 212. The light source 320 is disposed on one side of the light incident surface 200c. The light source 320 supplies the light L into the light incident surface 200c to be conducted in the light guide plate 310. Referring to FIG. 7 , the backlight module 3 ′ may further include a reflective sheet 330 ′ disposed on one side of the bottom surface 2 〇〇 a of the light guide plate 310 . In this manner, the light L emitted from the through hole 212 and the light L that is repeatedly refracted and reflected through the inner circumference light guiding portion 23 and are emitted in the downward direction of the through hole 212 can be reflected by the reflection sheet 330 from the light guide plate 200. The light exit surface 2〇〇b is emitted. In addition, the light source 320 may be an array of light emitting diodes or other suitable light source, and the present invention is not limited to the type of the light source 320 used. The light guide plate 200 and the backlight module 3 can be applied to various electronic cracking or lighting devices, such as a keyboard, a computer case, a display, etc., having holes, holes, irregular spaces or through holes. The rice guide plate 2 of the present invention can be applied to the person who needs to derive light through the light guide plate. The application mode of the light guide plate 210 will be described by taking a keyboard as an example. The keyboard (not shown) has a plurality of buttons (not shown). A light guide plate 210 having a plurality of through holes 212 may be mounted under the keys, and the keys correspond to the through holes 212. In this way, design elements such as color and light can be introduced into the keyboard, so that the appearance of the keyboard is more attractive, and by providing the first groove 220 around the through hole 212, the rear surface 212 can be eliminated. Dark lines. 201122574 ^^»v^l9TW(I) 33042twf.doc/n Figure 8 is a flow diagram of a method of conducting light according to a preferred embodiment of the present invention. The method of conducting light of the present invention will be understood by referring to Figs. 3 and 8. First, in step S401, a light guide plate 200 is provided, which has at least a uniform hole 212. Next, in step S402, a first trench 220 is disposed around the through hole 212, and a region between the first trench 22 and the through hole 212 is formed as an inner light guiding portion 230, wherein the light guide plate is entered. The light ray L that is conducted is refracted by the inner light guiding portion 230 to emit light around the through hole 212. 9 to 11 are perspective views showing several ways in which light is conducted in the backlight module of Fig. 7. First, referring to Fig. 9', the light L incident from the light incident surface 200c of the light guide plate 31 is caused to cause total reflection in the light guide plate 310. In particular, the light ray L enters the inner peripheral light guiding portion 23A through the uncut light guide plate 310' at the first groove 220. The light L entering the inner light guiding portion 230 continues to be reflected and refracted to reach the rear of the through hole 212. Then, the light ray L emits light in the vertical direction around the through hole 212, that is, the light is emitted from the bottom surface 200a of the light guide plate 310 and the light exit surface 200b. Referring to Fig. 10', the light L' incident from the light incident surface 200c of the light guide plate 310 causes total reflection in the light guide plate 310 to travel. In particular, the light L exits the light guide plate 310 and enters the first groove 220, and then enters the inner circumference light guiding portion 230 from the first groove 220. The light L entering the inner light guiding portion 230 continues to be reflected and refracted to reach the rear of the through hole 212. Then, the light L is emitted in the vertical direction around the through hole 212, that is, light is emitted from the bottom surface 200a and the light exit surface 200b of the light guide plate 310. Referring again to Fig. 11, 11 201122574 33042 twf.d 〇 C / n light L ′ incident from the light incident surface 200 c of the light guide plate 310 is caused to cause total reflection in the light guide plate 310 to travel. In particular, the light ray L exits the first groove 220 and travels toward the reflection sheet 330. The light L reflected by the reflection sheet 330 re-enters the inner circumference light guiding portion 230. The light incident on the inner circumference light guide portion 230 is read and reflected and refracted to reach the rear of the through hole: 212. Then, the light ray L emits light in the vertical direction around the through hole 212, i.e., 'from the bottom surface 2〇〇a of the light guide plate 310 and the light exit surface 2〇〇b. Further, as shown in Figs. 9 to 11, the reflection sheet 330 may have a through hole 332' to facilitate the arrangement of electronic components (not shown). Of course, whether or not the reflection sheet 330 has the through hole 332 is determined according to design requirements, and the present invention is not limited thereto. In summary, the light guide plate, the backlight module and the method for conducting light of the present invention have at least the following advantages: The conduction of light in the light guide plate is by the laws of reflection and refraction. No matter what shape of the through hole is encountered, it will surely reach a certain degree of attenuation, resulting in the formation of a dark band behind the hole. However, the present invention uses the first groove to be disposed around the through hole and to form the inner circumference light guiding portion. The above design can transmit light to the rear of the through hole or to the upper and lower directions around the through hole before the light passes through the through hole, thereby solving the dark band problem and improving the use efficiency of the light. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. 12 201122574 uLiuyu!9TW(I) 33042twf.doc/n . [Simple Description of the Drawings] FIG. 1 is a perspective view of a conventional light guiding plate. - Figure 2 is a schematic view of another known light guide plate. 3 is a perspective view of a light guide plate according to a preferred embodiment of the present invention, and FIG. 4 is an enlarged schematic view of the through hole and the first groove of FIG. FIG. 5 is a perspective view showing a configuration of four through holes and a light guiding pattern according to a preferred embodiment of the present invention. 6A to 6D are schematic cross-sectional views taken along line I-Ι of Fig. 5. FIG. 7 is a schematic diagram of a backlight module according to a preferred embodiment of the present invention. Figure 8 is a flow diagram of a method of conducting light in accordance with a preferred embodiment of the present invention. 9 to 11 are perspective views showing several ways in which light is conducted in the backlight module of Fig. 7. [Main component symbol description] • 100, 100a: light guide plates 110, 122, 124: through hole 200: light guide plate 200a: bottom surface 200b: light exit surface 200c: light incident surface 210: light transmitting substrate 212, 332: through hole 13 201122574W (I) 33042twf.doc/n 220: first trench 222: second trench 230: inner light guiding portion 300: backlight module 310: light guide plate 320: light source 330: reflective sheet S401, S402: step D1: First direction D2: second direction L: light