1300151 12916twfl.doc 97-05-09 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種背光模組，且特別是有關於一種 可發出均勻色度及輝度的背光模組及其光源模組。 【先前技術】 隨著產業日益發達，行動電話、數位相機、數位攝影 機、筆記型電腦、桌上型電腦等數位化工具無不朝向更便 利、多功能且美觀的方向發展。然而’行動電話、數位相 機、數位攝影機、筆記型電腦及桌上型電腦的顯示螢幕是 不可或缺的人機溝通界面’透過上述產品之顯示螢幕將可 以爲使用者的操作帶來更多的便利。近年來，大部分的行 動電話、數位相機、數位攝影機、筆記型電腦以及桌上型 電腦上之顯示螢幕皆以液晶顯示面板（LCD panel)爲主 流。然而，由於液晶顯示面板本身並不具有發光的功能， 故在液晶顯示面板下方必須提供一背光模組（back light module)以提供液晶面板所需之面光源，使得液晶面板達 到顯示的效果，並同時獲得足夠之亮度與對比，進而達到 顯示的功能。 値得注意的是，背光模組通常分爲側面入光式與直下 式兩種。其中，側面入光式之背光模組需藉由一導光板 (light guide plate)，以將線光源轉換爲液晶面板所需之 面光源。此外，由於發光二極體具有高色彩飽和度、不含 汞、高壽命、低熱問題、可透過驅動電流調整色溫等特性， 因此發光二極體陣列已逐漸被應用於背光模組中。 圖1A繪示爲習知側面入光式之背光模組的側視剖面 1300151 12916twfl.doc 97-05-09 示意圖。而圖1B則繪示爲習知側面入光式之背光模組的立 體示意圖。 請同時參照圖1A及圖1B，習知側面入光式背光模組 100中，發光二極體1〇2係配置在混光元件104之光入射截 面110處，以使發光二極體所發出之光線由光入射截面110 入射至混光元件104之中。當發光二極體102所發出之光 線在混光元件104中完成混光後，會由混光元件104之光 出射截面112出射，並射進連接混光元件104以及導光板 108的光線轉向裝置106中。而光線在藉由光線轉向裝置 106內部之反射面118將其反射後，會由導光板1〇8的光入 射截面114入射至導光板108之中，最後再由導光板108 的光出射截面116出射。 然而，此種背光模組需要較長的混光距離才能夠將發 光二極體所發出之光線均勻混合。因此，整體背光模組也 同樣需要較大的體積。在目前顯示器逐漸趨向輕薄化的潮 流中，此種習知背光摸組的應用範圍相當有限。 【發明內容】 因此，本發明的目的就是提供一種光源模組，可發出 混光均勻的光線。 本發明的另一目的是提供一種背光模組，可提供均勻 的光線色度及輝度，且整體來說體積較小重量也較輕，適 於輕且薄的平面顯示器。 本發明提出一種光源模組，主要是由混光管、多個發 光兀件以及弟一^先線轉向裝置所構成。其中，混光管旦有 1300151 12916twfl.doc 97-05-09 一第一端面，而此些發光元件係配置在混光管內。第一光 線轉向裝置具有第一光出射截面，且第一光線轉向裝置係 連接至混光管之第一端面，以使發光元件所發出的光線由 混光管出射至第一光線轉向裝置，再經由第一光線轉向裝 置的第一光出射截面出射。 依照本發明之一實施例所述，混光管的第一端面與第 一光線轉向裝置的第一光出射截面之間具有一第一夾角， 且此第一夾角例如是90度或180度。 依照本發明之一實施例所述，此光源模組更包括一第 一散射元件。而此第一散射元件係與第一光線轉向裝置連 接’並適於令由第一光線轉向裝置之第一光出射截面出射 的光線散射。 依照本發明之一實施例所述，混光管更具有第二端 面，而此光源模組更包括一第二光線轉向裝置。其中第二 光線轉向裝置連接至於混光管的第二端面，並具有第二光 出射截面，以使發光元件所發出的光線由混光管出射至第 二光線轉向裝置，再經由第二光線轉向裝置的第二光出射 截面出射。 依照本發明之一實施例所述，混光管的第二端面與第 二光線轉向裝置的第二光出射截面之間具有一第二夾角， 且此第二夾角例如是90度或180度。 依照本發明之一實施例所述，此光源模組更包括一共 用散射元件，此共用散射元件係與第一及第二光線轉向裝 置連接’且適於令由弟一光線轉向裝置之第一光出射截面 7 1300151 12916twfl.doc 97-05-09 及第二光線轉向裝置之第二光出射截面出射的光線散射。 依照本發明之一實施例所述，當第二夾角爲90度時， 此光源模組更包括一第二散射元件，此第二散射元件係與 第二光線轉向裝置連接，且適於令由第二光線轉向裝置之 第二光出射截面出射的光線散射。 依照本發明之一實施例所述，此些發光元件包括不同 色光的發光元件，其例如是發光二極體。 本發明提出一種背光模組，主要是由導光元件以及本 發明之光源模組所構成。其中，光源模組係配置在鄰近導 光元件之處。且發光元件所發出的光線係透過第一光線轉 向裝置之第一光出射截面而入射導光元件。 本發明提出一種背光模組，主要是由導光元件以及本 發明之光源模組所構成。其中，導光元件具有一第一側， 而光源模組即是配置在導光元件之第一側。光源模組主要 是由混光管、多個發光元件、第一光線轉向裝置以及第二 光線轉向裝置所構成。混光管具有一第一端面以及一第二 端面，而發光元件係配置於混光管內。第一光線轉向裝置 係連接至混光管之第一端面，且第一光線轉向裝置係具有 朝向導光元件之第一側的第一光出射截面。而第二光線轉 向裝置係連接至混光管之第二端面，且第二光線轉向裝置 係具有朝向導光元件之第一側的第二光出射截面。 依照本發明之一實施例所述，第一光線轉向裝置係配 置在導光元件之邊緣。 依照本發明之一實施例所述，混光管的第一端面與第 8 1300151 12916twfl.doc 97-05-09 一光線轉向裝置的第一光出射截面之間具有一第一夾角， 此第一夾角例如是90度或180度。在本發明之一實施例 中，當第一夾角爲90度時，導光元件具有一第一側，而混 光管係位於導光元件之第一側，且第二光線轉向裝置之第 二光出射截面亦朝向該導光元件之第一側。而在另一實施 例中，當第一夾角爲180度時，導光元件具有第一側以及 與該第一側相鄰之第二側，且混光管係位於導光元件之第 一側，而第一光線轉向裝置之第一光出射截面係朝向導光 元件之第二側。 依照本發明之一實施例所述，此背光模組更包括第一 散射元件。而此第一散射元件係與第一光線轉向裝置連 接，並適於令由第一光線轉向裝置之第一光出射截面處出 射之光線散射至導光元件中。 依照本發明之一實施例所述，第一散射元件與光源模 組係配置在導光元件的一側，且第一散射元件係位於混光 管與導光元件之間。 依照本發明之一實施例所述，第一散射元件係配置在 導光元件的一側，而混光管則係配置在第一散射元件的下 方。 依照本發明之一實施例所述，導光元件具有第一側以 及與第一側相鄰之第二側，而第一散射元件與混光管係分 別相鄰於導光元件之第一側與第二側配置。 依照本發明之一實施例所述’此光源模組更包括具有 第二光出射截面的第二光線轉向裝置’配置於混光管之第 1300151 12916twf1. doc 97-05-09 二端面，以使發光元件所發出的光線由混光管出射至第二 光線轉向裝置，並透過第二光線轉向裝置之第二光出射截 面出射。 依照本發明之一實施例所述，混光管的第二端面與第 二光線轉向裝置的第二光出射截面之間具有一第二夾角， 且此第二夾角例如是9〇度或180度。 依照本發明之一實施例所述，此背光模組更包括一共 用散射元件。而此共用散射元件係與第一及第二光線轉向 裝置連接，並適於令由第一光線轉向裝置之第一光出射截 面以及第二光線轉向裝置之第二光出射截面出射之光線散 射至導光元件中。 依照本發明之一實施例所述，共用散射元件及光源模 組係配置在導光元件的一側，且共用散射元件係位於混光 管與導光元件之間。 依照本發明之一實施例所述，共用散射元件係配置在 導光元件的一側，而混光管則係配置在共用散射元件的下 方。 依照本發明之一實施例所述，當第二夾角爲90度時， 此背光模組更包括第二散射元件。而第二散射元件係與第 二光線轉向裝置連接，並適於令由第二光線轉向裝置之第 二光出射截面出射之光線散射至導光元件中。 依照本發明之一實施例所述，第二散射元件及光源模 組係配置在導光元件的一側，且第二散射元件係位於混光 管與導光元件之間。 10 1300151 12916twfl.doc 97-05-09 依照本發明之一實施例所述，導光元件具有第一側以 及與第一側相鄰之第二側，而第二散射元件與混光管係分 別相鄰於導光元件之第一側與第二側配置。 依照本發明之一實施例所述，導光元件例如是導光 板，而發光元件包括不同色光的發光元件，其例如是發光 二極體。 本發明係將發光元件配置於混光管之中，並使發光元 件所發出之光線在混光管內經由多次反射混光之後，由混 光管之二端出射，所以光線可於較短的距離內達成均勻混 光而使得出射之光線具有均勻的色度及輝度。由此可知， 本發明之背光模組的體積較習知之背光模組的體積小，因 而能夠應用於輕薄化的顯示器中。 爲讓本發明之上述和其他目的、特徵和優點能更明顯 易懂，下文特舉一較佳實施例，並配合所附圖式，作詳細 說明如下。 【實施方式】 圖2A繪示爲本發明一較佳實施例的一種背光模組之 上視圖。而圖2B則繪示爲圖2A所繪示之光源模組的側視 剖面示意圖。請同時參照圖2A及圖2B，背光模組200係 由導光元件202以及光源模組204所構成。其中，導光元 件2〇2例如是一導光板，並具有光出射截面120以及光入 射截面130。而光源模組204係配置在導光元件202之側 邊，在本實施例中，光源模組2〇4例如是配置在鄰近導光 元件202的光入射截面130之處。且光源模組204主要是 1300151 12916twfl.doc 97-05-09 由混光管206、多個發光元件2〇8、第一光線轉向裝置210 以及第二光線轉向裝置212所構成。 發光元件208係配置在混光管206之內，其例如是發 光二極體元件。而且，此些發光元件208可以是具有相同 色光之發光元件，也可以是具有不同色光之發光元件，熟 習此技藝者可依實際所需來作選擇。 混光管206之二端分別具有第一端面214以及第二端 面216。而第一光線轉向裝置210與第二光線轉向裝置212 即是分別連接至混光管206之第一端面214及第二端面 216。其中，第一轉向裝置210具有第一光出射截面218， 第二光線轉向裝置212則具有第二光出射截面22〇。且第二 光出射截面218與第二光出射截面220皆對應至導光元件 202之光入射截面130。 請再參照圖2A，値得注意的是，第一光線轉向裝置210 與第二光線轉向裝置212內部例如是具有反射面（未繪 示），當發光元件208所發出的光線由第一端面214與第 二端面216出射混光管206之後，會照射至第一光線轉向 裝置210與第二光線轉向裝置212內部的反射面，進而改 變其行進方向而由第一光出射截面218以及第二光出射截 面220出射，再經由光入射截面130入射至導光元件202 中。特別的是，在本實施例中，第一端面214與第一光出 射截面218間的夾角，以及第二端面216與第二光出射截 面220間的夾角例如是90度。因此，光線入射導光元件202 的方向係與光線由混光管206中出射時的行進方向相差90 12 1300151 12916twfl.doc 97-05-09 度。 而導光元件202內部例如是具有一擴散面（未繪示）， 當光線入射至導光元件202後，即會藉由此擴散面將光線 擴散之後，再由光出射截面120出射。 値得注意的是，由於本實施例之光源模組204可以較 小的體積來達成均勻的混光效果，因此不但可使本發明之 背光模組200所發出之光線具有較均勻的輝度及色度，更 可以縮小整體背光模組的體積，以符合現代顯示器逐漸輕 薄化的趨勢。 然而，本實施例係用以說明本發明之背光模組，並非 用以限定本發明。圖3A至圖3C繪示爲依照本實施例加以 變化的背光模組之上視圖。 在本發明之另一實施例中，導光元件202例如是具有 與光入射截面130相對之光入射截面140,則此背光模組即 可同時在光入射截面130與光入射截面140處配置光源模 組204，如圖3A所示。 此外，本發明還可以在導光元件202之光入射截面130 或光入射截面140至少其中之一處配置多個光源模組 204，以增加背光模組所出射的光線強度，如圖3B所示。 另外，本發明並未限定光源模組204中之光線轉向裝 置的數量。本發明之光源模組也可以僅配置單一光線轉向 裝置，例如是第一光線轉向裝置210，如圖3C所示。 値得一提的是，在本發明之另一實施例中，光源模組 還可以係配置在導光元件之光入射截面的鄰邊，並藉由散 13 1300151 97-05-09 129 16twf 1 .doc 射兀件將光線散射至導光元件中，以便於進一步混光。以 下將配合圖式說明此實施例，而在本實施例之圖式中之元 件標號與圖2A及圖2B所繪示相同者，其材質與用途皆相 似於圖2A及圖2B之說明，以下將不再贅述。 圖4繪示爲本發明之另一實施例中的背光模組之上視 圖。請參照圖4，背光模組400包括導光元件202、光源模 組204、第一散射元件410以及第二散射元件420。其中， 導光元件具有光入射截面130以及與其相對之光入射截面 140。光源模組204係配置在導光元件202之光入射截面130 以及光入射截面14〇的鄰邊。第一散射元件410係連接至 第一光線轉向裝置210,並對應至第一光線轉向裝置210 之第一光出射截面218以及導光元件202之光入射截面 130。而第二散射元件420係連接至第二光線轉向裝置 212，並對應至第二光線轉向裝置212之第二光出射截面 220以及導光元件202之光入射截面140。 特別的是，第一散射元件410與第二散射元件420內 部皆具有一擴散面402,以使光線入射第一散射元件410 與第二散射元件420後，可藉由擴散面402對光線進行進 一步地混光，之後再由光入射截面130以及光入射截面140 入射至導光元件202之中。最後，再由導光元件2〇2之光 出射截面120出射。 如同前述之說明，本實施例之背光模組還可以有其他 變化。圖5A至圖5C繪示爲依照圖4所繪示之背光模組加 以變化之背光模組的上視圖。 14 1300151 12916twfl.doc 97-05-09 本發明之背光模組當然也可以僅配設單一光線轉向裝 置以及散射元件，以縮小整體背光模組的體積。其例如是 在本發明之背光模組中配置第一散射元件410連接至第一 光線轉向裝置210，如圖5A所示。本發明並未限定背光模 組中所需配設之散射元件的數量，熟習此技藝者可自行依 實際所需而決定。 此外，本發明還可以在背光模組中配置一個以上的光 源模組2〇4，如圖5B及圖5C所示。 另外，雖然在前述之所有實施例中，混光管的光出射 截面與光線轉向裝置之光出射截面間的夾角皆爲90度，也 就是說，光線轉向裝置係將光線的行進方向轉了 90度。然 而，上述之實施例僅係用以說明本發明，而非用以限定本 發明。在本發明之其他實施例中，光線轉向裝置還可以將 光線的行進路徑轉動180度或是其他角度，熟習此技藝者 可依實際情況所需來調整光線的轉向角度。以下將舉實施 例來說明本發明中可將光線之行進路徑轉動180度的光源 模組。 圖6繪示爲本發明一較佳實施例的一種背光模組之上 視圖。値得注意的是，本實施例中的背光模組600與第一 實施例中的背光模組200 (如圖2A及圖2B所示）僅在光 線轉向裝置及其配置上有所不同。因此，此處主要係針對 光線轉向裝置的配置作說明，其他與圖2A及圖2B中之標 號相同的元件，其配置位置、材料或用途等等，皆與第一 實施例中所述相同，此處將不再贅述。 15 1300151 97-05-09 12916twfl.doc 請參照圖6，光源模組2〇4例如是配置在導光元件2〇2 之光入射截面130以及光入射截面140之鄰邊。第一光線 轉向裝置602與第二光線轉向裝置604係分別配置於混光 管202之二端。而第一光線轉向裝置6〇2之第一光出射截 面606係對應至導光元件202之光入射截面130,第二光線 轉向裝置604之第二光出射截面608則係對應至導光元件 2〇2之光入射截面140。且第一光線轉向裝置602之第一光 出射截面606與混光管206之第一端面214間，以及第二 光線轉向裝置604之第二光出射截面608與混光管206之 第二端面216間的夾角皆爲180度。 而且，第一光線轉向裝置602與第二光線轉向裝置604 內部例如是具有一反射面（未繪示），所以當發光元件208 由混光管206內部發出光線並分別經由第一端面214以及 第二端面216出射至第一光線轉向裝置602與第二光線轉 向裝置604時，光線會照射至此反射面並改變其行進方向 而分別經由第一光線轉向裝置602之第一光出射截面606 以及第二光線轉向裝置604之第二光出射截面608出射。 也就是說，第一光線轉向裝置602與第二光線轉向裝置604 係將由混光管206所出射之光線轉180度後出射，再經由 導光元件202之光入射截面130與光入射截面140入射至 導光元件202中，最後由導光元件202之光出射截面120 出射。 當然，本發明還可以依照本實施例來作變化。圖7A至 圖7D繪示爲依照本實施例加以變化的背光模組之上視圖。 16 1300151 6twfl.doc 97-05-09 値得注意的是，本發明之第一光線轉向裝置6〇2與第 一光線轉向裝置6〇4的形狀並未限定於圖6A所繪示之形 狀。本發明還可以將第一光線轉向裝置6〇2之第二光出射 截面606與第二光線轉向裝置604之第二光出射截面6〇8 面積加大，如圖7A所示，以便於均勻入射至導光元件2〇2 中。 當然，本發明之背光模組也可以只配置單一光線轉向 裝置，例如是在混光管206之一端配置第一光線轉向裝置 604，如圖7B所示。熟習此技藝者可自行依實際所需來對 光源模組所配設之光線轉向裝置的數量作調整。 此外，本發明還可以在一背光模組中配置多個光源模 組204、第一光線轉向裝置602以及第二光線轉向裝置 604，如圖7C及圖7D所示。 特別的是，本發明還可以在本實施例之背光模組600 中配設散射元件，以使光線可均勻發散。以下將舉實施例 加以說明。 圖8繪示爲本發明之一實施例的背光模組之上視圖。 請參照圖8,散射元件800與光源模組204皆配置於導光元 件202之光入射截面130處，且散射元件800係位於混光 管206與導光元件202之間。特別的是，散射元件800係 連接於第一光線轉向裝置602之第一光出射截面606以及 第二光線轉向裝置604之第二光出射截面608。因此，由發 光元件208所發出之光線會先由混光管206之第一端面214 以及第二端面216分別出射至第一光線轉向裝置602與第 171300151 12916twfl.doc 97-05-09 IX. Description of the Invention: [Technical Field] The present invention relates to a backlight module, and more particularly to a backlight module capable of emitting uniform chromaticity and luminance Light source module. [Prior Art] With the development of the industry, digital devices such as mobile phones, digital cameras, digital cameras, notebook computers, and desktop computers are all moving toward more convenient, versatile, and aesthetically pleasing directions. However, the display screens of mobile phones, digital cameras, digital cameras, notebook computers and desktop computers are indispensable human-machine communication interfaces. The display screen of the above products will bring more operations to users. convenient. In recent years, most of the display screens on mobile phones, digital cameras, digital cameras, notebook computers, and desktop computers have been dominated by liquid crystal display panels (LCD panels). However, since the liquid crystal display panel itself does not have the function of emitting light, a backlight module must be provided under the liquid crystal display panel to provide a surface light source required for the liquid crystal panel, so that the liquid crystal panel achieves the display effect, and At the same time, get enough brightness and contrast to achieve the displayed function. It is worth noting that the backlight module is usually divided into a side-input type and a direct type. The side-lit backlight module needs to be converted into a surface light source required for the liquid crystal panel by a light guide plate. In addition, since the light-emitting diode has high color saturation, no mercury, high lifetime, low heat problem, and adjustable color temperature through the driving current, the light-emitting diode array has been gradually applied to the backlight module. FIG. 1A is a schematic side view of a conventional side-lit backlight module 1300151 12916 twfl.doc 97-05-09. FIG. 1B is a schematic perspective view of a conventional side-lit backlight module. Referring to FIG. 1A and FIG. 1B simultaneously, in the conventional side-lit backlight module 100, the light-emitting diodes 1〇2 are disposed at the light incident cross section 110 of the light mixing element 104 so that the light-emitting diodes are emitted. The light is incident into the light mixing element 104 by the light incident section 110. When the light emitted by the LED 102 is mixed in the light mixing element 104, it is emitted from the light exiting section 112 of the light mixing element 104, and is incident on the light guiding device connecting the light mixing element 104 and the light guide plate 108. 106. After the light is reflected by the reflective surface 118 inside the light redirecting device 106, the light is incident on the light guide plate 108 by the light incident section 114 of the light guide plate 〇8, and finally the light exiting section 116 of the light guide plate 108 is emitted. Exit. However, such a backlight module requires a long light-mixing distance to uniformly mix the light emitted by the light-emitting diode. Therefore, the overall backlight module also requires a large volume. In the current tidal currents where displays tend to be lighter and thinner, the range of applications of such conventional backlighting sets is rather limited. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a light source module that emits light that is uniformly mixed. Another object of the present invention is to provide a backlight module which can provide uniform light chromaticity and luminance, and which is small in size and light in weight as a whole, and is suitable for a light and thin flat panel display. The invention provides a light source module, which is mainly composed of a light mixing tube, a plurality of light emitting elements and a first-line steering device. Wherein, the light mixing tube has a first end face of 1300151 12916twfl.doc 97-05-09, and the light emitting elements are disposed in the light mixing tube. The first light guiding device has a first light exiting section, and the first light redirecting device is connected to the first end surface of the light mixing tube, so that the light emitted by the light emitting element is emitted from the light mixing tube to the first light steering device, and then The first light exiting section of the first light redirecting device exits. According to an embodiment of the invention, the first end face of the light mixing tube has a first angle with the first light exiting section of the first light redirecting device, and the first angle is, for example, 90 degrees or 180 degrees. According to an embodiment of the invention, the light source module further includes a first scattering element. The first scattering element is coupled to the first light redirecting means and adapted to scatter light emitted by the first light exiting section of the first light redirecting means. According to an embodiment of the invention, the light mixing tube further has a second end surface, and the light source module further includes a second light redirecting device. The second light redirecting device is connected to the second end surface of the light mixing tube and has a second light exiting cross section, so that the light emitted by the light emitting element is emitted from the light mixing tube to the second light steering device, and then turned through the second light. The second light exit section of the device exits. According to an embodiment of the invention, the second end face of the light mixing tube and the second light exiting section of the second light redirecting device have a second angle, and the second angle is, for example, 90 degrees or 180 degrees. According to an embodiment of the invention, the light source module further includes a common scattering element coupled to the first and second light redirecting devices and adapted to be the first of the light steering device The light exit section 7 1300151 12916twfl.doc 97-05-09 and the light exiting from the second light exit section of the second light redirecting device scatter. According to an embodiment of the invention, when the second angle is 90 degrees, the light source module further includes a second scattering element, and the second scattering element is connected to the second light redirecting device, and is adapted to be The light emitted by the second light exiting section of the second light redirecting device is scattered. According to an embodiment of the invention, the light-emitting elements comprise light-emitting elements of different color lights, such as light-emitting diodes. The invention provides a backlight module, which is mainly composed of a light guiding element and a light source module of the invention. Wherein, the light source module is disposed adjacent to the light guiding component. And the light emitted by the light-emitting element passes through the first light exiting section of the first light-directing device and enters the light-guiding element. The invention provides a backlight module, which is mainly composed of a light guiding element and a light source module of the invention. The light guiding element has a first side, and the light source module is disposed on the first side of the light guiding element. The light source module is mainly composed of a light mixing tube, a plurality of light emitting elements, a first light steering device and a second light steering device. The light mixing tube has a first end surface and a second end surface, and the light emitting elements are disposed in the light mixing tube. The first light redirecting device is coupled to the first end face of the light mixing tube, and the first light redirecting device has a first light exiting section toward the first side of the light directing element. The second light redirecting device is coupled to the second end face of the light mixing tube, and the second light redirecting device has a second light exiting section toward the first side of the light directing element. According to an embodiment of the invention, the first light redirecting device is disposed at an edge of the light guiding element. According to an embodiment of the present invention, the first end face of the light mixing tube has a first angle with the first light exiting section of the light guiding device of the eighth 1300151 12916 tw. doc 97-05-09, the first angle The angle is, for example, 90 degrees or 180 degrees. In an embodiment of the invention, when the first angle is 90 degrees, the light guiding element has a first side, and the light mixing tube is located on the first side of the light guiding element, and the second light steering device is second The light exiting section also faces the first side of the light guiding element. In another embodiment, when the first angle is 180 degrees, the light guiding element has a first side and a second side adjacent to the first side, and the light mixing tube is located on the first side of the light guiding element And the first light exiting section of the first light steering device is toward the second side of the light guiding element. According to an embodiment of the invention, the backlight module further includes a first scattering element. The first scattering element is coupled to the first light redirecting means and adapted to scatter light exiting the first light exit section of the first light redirecting means into the light guiding element. According to an embodiment of the invention, the first scattering element and the light source module are disposed on one side of the light guiding element, and the first scattering element is located between the light mixing tube and the light guiding element. According to an embodiment of the invention, the first scattering element is disposed on one side of the light guiding element, and the light mixing tube is disposed below the first scattering element. According to an embodiment of the invention, the light guiding element has a first side and a second side adjacent to the first side, and the first scattering element and the light mixing tube are respectively adjacent to the first side of the light guiding element Configured with the second side. According to an embodiment of the present invention, the light source module further includes a second light redirecting device having a second light exiting cross section disposed on the second end of the light mixing tube, 1300151 12916 twf1.doc 97-05-09, so that The light emitted by the illuminating element is emitted from the light mixing tube to the second light redirecting device and is transmitted through the second light exiting section of the second light redirecting device. According to an embodiment of the invention, the second end face of the light mixing tube and the second light exiting section of the second light redirecting device have a second angle, and the second angle is, for example, 9 degrees or 180 degrees. . According to an embodiment of the invention, the backlight module further includes a common scattering element. The shared scattering element is coupled to the first and second light redirecting devices and adapted to scatter light emitted by the first light exiting section of the first light redirecting device and the second light exiting section of the second light redirecting device to In the light guiding element. According to an embodiment of the invention, the shared scattering element and the light source module are disposed on one side of the light guiding element, and the common scattering element is located between the light mixing tube and the light guiding element. According to an embodiment of the invention, the shared scattering element is disposed on one side of the light guiding element, and the light mixing tube is disposed below the common scattering element. According to an embodiment of the invention, when the second angle is 90 degrees, the backlight module further includes a second scattering element. The second scattering element is coupled to the second light redirecting means and adapted to scatter light emerging from the second light exiting section of the second light redirecting means into the light directing element. According to an embodiment of the invention, the second scattering element and the light source module are disposed on one side of the light guiding element, and the second scattering element is located between the light mixing tube and the light guiding element. 10 1300151 12916 twfl.doc 97-05-09 According to an embodiment of the invention, the light guiding element has a first side and a second side adjacent to the first side, and the second scattering element and the light mixing tube system respectively Adjacent to the first side and the second side of the light guiding element. According to an embodiment of the invention, the light guiding element is, for example, a light guiding plate, and the light emitting element comprises a light emitting element of different color light, which is, for example, a light emitting diode. In the invention, the light-emitting element is disposed in the light mixing tube, and the light emitted by the light-emitting element is mixed by the multiple reflections in the light mixing tube, and then emitted from the two ends of the light mixing tube, so the light can be shorter. Uniform light mixing is achieved within the distance so that the emitted light has a uniform chromaticity and luminance. Therefore, the backlight module of the present invention has a smaller volume than the conventional backlight module, and thus can be applied to a slim and light display. The above and other objects, features, and advantages of the present invention will become more apparent from the understanding of the appended claims. 2A is a top view of a backlight module according to a preferred embodiment of the present invention. 2B is a side cross-sectional view of the light source module illustrated in FIG. 2A. Referring to FIG. 2A and FIG. 2B simultaneously, the backlight module 200 is composed of a light guiding element 202 and a light source module 204. The light guiding element 2〇2 is, for example, a light guide plate and has a light exiting section 120 and a light incident section 130. The light source module 204 is disposed on the side of the light guiding element 202. In the embodiment, the light source module 2〇4 is disposed, for example, at a position adjacent to the light incident section 130 of the light guiding element 202. The light source module 204 is mainly composed of a light mixing tube 206, a plurality of light emitting elements 2〇8, a first light redirecting device 210, and a second light redirecting device 212, which are mainly 1300151 12916twfl.doc 97-05-09. Light-emitting element 208 is disposed within light mixing tube 206, which is, for example, a light-emitting diode element. Moreover, the light-emitting elements 208 may be light-emitting elements having the same color light or light-emitting elements having different color lights, and those skilled in the art may select them according to actual needs. The two ends of the light mixing tube 206 have a first end surface 214 and a second end surface 216, respectively. The first light redirecting device 210 and the second light redirecting device 212 are respectively connected to the first end surface 214 and the second end surface 216 of the light mixing tube 206. Wherein, the first steering device 210 has a first light exiting section 218, and the second light redirecting device 212 has a second light exiting section 22A. The second light exiting section 218 and the second light exiting section 220 all correspond to the light incident section 130 of the light guiding element 202. Referring to FIG. 2A again, it is noted that the first light redirecting device 210 and the second light redirecting device 212 have a reflecting surface (not shown) inside, for example, when the light emitted by the light emitting element 208 is emitted by the first end surface 214. After the second end face 216 exits the light mixing tube 206, it will illuminate the reflective surface inside the first light redirecting device 210 and the second light redirecting device 212, thereby changing its traveling direction, and the first light exiting section 218 and the second light. The exit section 220 exits and is incident into the light guiding element 202 via the light incident section 130. In particular, in the present embodiment, the angle between the first end surface 214 and the first light exiting section 218, and the angle between the second end surface 216 and the second light exiting section 220 is, for example, 90 degrees. Therefore, the direction in which the light is incident on the light guiding element 202 is different from the traveling direction when the light is emitted from the light mixing tube 206 by 90 12 1300151 12916 twfl.doc 97-05-09 degrees. The light guiding element 202 has, for example, a diffusing surface (not shown). When the light is incident on the light guiding element 202, the light is diffused by the diffusing surface, and then emitted from the light exiting section 120. It should be noted that since the light source module 204 of the present embodiment can achieve a uniform light mixing effect with a small volume, the light emitted by the backlight module 200 of the present invention can have a relatively uniform brightness and color. The degree of the overall backlight module can be reduced to meet the trend of modern display becoming thinner and lighter. However, the present embodiment is for explaining the backlight module of the present invention, and is not intended to limit the present invention. 3A to 3C are top views of a backlight module according to the embodiment. In another embodiment of the present invention, the light guiding element 202 has a light incident cross section 140 opposite to the light incident cross section 130, and the backlight module can simultaneously configure the light source at the light incident cross section 130 and the light incident cross section 140. Module 204 is shown in Figure 3A. In addition, the present invention can also configure a plurality of light source modules 204 at at least one of the light incident section 130 or the light incident section 140 of the light guiding component 202 to increase the intensity of light emitted by the backlight module, as shown in FIG. 3B. . Additionally, the present invention does not limit the number of light redirecting devices in the light source module 204. The light source module of the present invention may also be provided with only a single light redirecting device, such as first light redirecting device 210, as shown in Figure 3C. It is to be noted that, in another embodiment of the present invention, the light source module may be disposed on the adjacent side of the light incident cross section of the light guiding element, and is dispersed by 13 1300151 97-05-09 129 16twf 1 The .doc firing element scatters light into the light guiding element for further mixing. The embodiment will be described below with reference to the drawings, and the components in the drawings of the present embodiment are the same as those shown in FIG. 2A and FIG. 2B, and the materials and uses thereof are similar to those of FIG. 2A and FIG. 2B. Will not repeat them. 4 is a top view of a backlight module in another embodiment of the present invention. Referring to FIG. 4, the backlight module 400 includes a light guiding element 202, a light source module 204, a first scattering element 410, and a second scattering element 420. Wherein, the light guiding element has a light incident cross section 130 and a light incident cross section 140 opposite thereto. The light source module 204 is disposed on the light incident cross section 130 of the light guiding element 202 and the adjacent side of the light incident cross section 14A. The first scattering element 410 is coupled to the first light redirecting device 210 and corresponds to the first light exiting section 218 of the first light redirecting device 210 and the light incident section 130 of the light guiding element 202. The second scattering element 420 is coupled to the second light redirecting device 212 and corresponds to the second light exiting section 220 of the second light redirecting device 212 and the light incident section 140 of the light guiding element 202. In particular, the first scattering element 410 and the second scattering element 420 have a diffusion surface 402 inside, so that after the light is incident on the first scattering element 410 and the second scattering element 420, the light can be further extended by the diffusion surface 402. The light is mixed and then incident into the light guiding element 202 by the light incident section 130 and the light incident section 140. Finally, the light exiting section 120 of the light guiding element 2〇2 is again emitted. As described above, the backlight module of this embodiment can have other variations. 5A-5C are top views of the backlight module with the backlight module according to FIG. 14 1300151 12916twfl.doc 97-05-09 The backlight module of the present invention can of course be provided with only a single light redirecting device and a scattering element to reduce the volume of the overall backlight module. For example, in the backlight module of the present invention, the first scattering element 410 is disposed to be connected to the first light redirecting device 210, as shown in Fig. 5A. The present invention does not limit the number of scattering elements that need to be provided in a backlight module, and those skilled in the art can determine this according to actual needs. In addition, the present invention can also be configured with more than one light source module 2〇4 in the backlight module, as shown in FIGS. 5B and 5C. In addition, in all of the foregoing embodiments, the angle between the light exiting section of the light mixing tube and the light exiting section of the light redirecting device is 90 degrees, that is, the light steering device turns the traveling direction of the light to 90 degrees. degree. However, the above-described embodiments are merely illustrative of the invention and are not intended to limit the invention. In other embodiments of the present invention, the light redirecting device can also rotate the path of the light by 180 degrees or other angles, and the skilled person can adjust the steering angle of the light as needed. Hereinafter, an embodiment will be described to explain a light source module in which the traveling path of light can be rotated by 180 degrees in the present invention. FIG. 6 is a top view of a backlight module according to a preferred embodiment of the present invention. It should be noted that the backlight module 600 in this embodiment differs from the backlight module 200 in the first embodiment (as shown in FIGS. 2A and 2B) only in the optical steering device and its configuration. Therefore, the configuration of the light steering device is mainly described herein, and other components of the same reference numerals as those in FIG. 2A and FIG. 2B are disposed in the same position as the first embodiment. This will not be repeated here. Referring to FIG. 6, the light source module 2〇4 is disposed, for example, adjacent to the light incident section 130 and the light incident section 140 of the light guiding element 2〇2. The first light redirecting device 602 and the second light redirecting device 604 are respectively disposed at two ends of the light mixing tube 202. The first light exiting section 606 of the first light redirecting device 6〇2 corresponds to the light incident cross section 130 of the light guiding element 202, and the second light exiting section 608 of the second light redirecting device 604 corresponds to the light guiding element 2 The light of 〇2 is incident on the cross section 140. The first light exiting section 606 of the first light redirecting device 602 and the first end surface 214 of the light mixing tube 206, and the second light exiting section 608 of the second light redirecting device 604 and the second end surface 216 of the light mixing tube 206 The angle between the two is 180 degrees. Moreover, the first light redirecting device 602 and the second light redirecting device 604 have a reflecting surface (not shown), for example, so that when the light emitting element 208 emits light from the inside of the light mixing tube 206, respectively, through the first end surface 214 and the first When the two end faces 216 are emitted to the first light redirecting device 602 and the second light redirecting device 604, the light will illuminate the reflecting surface and change its traveling direction through the first light exiting section 606 and the second of the first light redirecting device 602, respectively. The second light exiting section 608 of the light redirecting device 604 exits. That is, the first light redirecting device 602 and the second light redirecting device 604 emit the light emitted by the light mixing tube 206 after being rotated by 180 degrees, and then enter through the light incident cross section 130 and the light incident cross section 140 of the light guiding element 202. To the light guiding element 202, finally, the light exiting section 120 of the light guiding element 202 is emitted. Of course, the present invention can also be modified in accordance with the present embodiment. 7A to 7D are top views of a backlight module according to the embodiment. 16 1300151 6twfl.doc 97-05-09 It should be noted that the shapes of the first light steering device 6〇2 and the first light steering device 6〇4 of the present invention are not limited to the shape illustrated in FIG. 6A. The present invention can also increase the area of the second light exiting section 606 of the first light redirecting device 6〇2 and the second light exiting section 6〇8 of the second light redirecting device 604, as shown in FIG. 7A, to facilitate uniform incidence. To the light guiding element 2〇2. Of course, the backlight module of the present invention can also be configured with only a single light steering device, for example, a first light redirecting device 604 is disposed at one end of the light mixing tube 206, as shown in Fig. 7B. Those skilled in the art can adjust the number of light steering devices provided by the light source module according to actual needs. In addition, the present invention can also configure a plurality of light source modules 204, a first light redirecting device 602, and a second light redirecting device 604 in a backlight module, as shown in Figures 7C and 7D. In particular, the present invention can also be provided with a scattering element in the backlight module 600 of the embodiment so that the light can be uniformly dispersed. The embodiment will be described below. FIG. 8 is a top view of a backlight module according to an embodiment of the invention. Referring to FIG. 8, the scattering element 800 and the light source module 204 are both disposed at the light incident section 130 of the light guiding element 202, and the scattering element 800 is located between the light mixing tube 206 and the light guiding element 202. In particular, the scattering element 800 is coupled to the first light exit section 606 of the first light redirecting device 602 and the second light exit section 608 of the second light redirecting means 604. Therefore, the light emitted by the light-emitting element 208 is first emitted from the first end surface 214 and the second end surface 216 of the light mixing tube 206 to the first light steering device 602 and the 17th, respectively.
Doom twfl.doc 97-05-09 二光線轉向裝置6〇4。之後再由第一光線轉向裝置6〇2之第 一光出射截面606以及第二光線轉向裝置604之第二光出 射截面608出射至散射元件800內。而散射元件800之內 部例如是具有擴散面610，以使光線入射散射元件800後’ 可藉由擴散面610對光線進行進一步的混光，之後再由光 入射截面130入射至導光元件202之中。最後，再由導光 元件202之光出射截面120出射。 當然，熟習此技藝者應該知道，本實施例之背光模組 也可作如同前述實施例所作之變化，此處將不再贅述。 在本發明之另一實施例中，除了圖8所繪示之配置外， 具有散射元件之背光模組還可以有另一種配置方法。圖9A 繪示爲本發明之一實施例的背光模組之上視圖。而圖9B則 繪示爲圖9A所繪示之光源模組之側視剖面圖。 請同時參照圖9A及圖9B，散射元件900係配置於導 光元件202之光入射截面130處，而光源模組204之混光 管206則係配置在散射元件之下方。在本實施例中，除了 混光管206以外，其他元件的相對配置位置皆與圖8所說 明之實施例相同，此處不再贅述。 値得一提的是，雖然本實施例係將混光管206配置於 散射元件900的下方，然而，在另一實施例中，混光管206 還可以是配置於導光元件202的下方。因此，若欲將本發 明之背光模組應用於較大型的照明設備或是顯示器時，可 於導光元件202的下方配置多組光源模組204，如圖10所 示，以便於在維持整體背光模組之面積不變的前提下，增 18 1300151 12916twfl.doc 97-05-09 加背光模組的發光亮度。 顯而易見的，在本實施例中，光源模組204在導光元 件202下方的排列方式除了圖10所繪示的平行排列外，其 還可以有其他種排列方式，例如是沿對角線之延伸方向排 列等等。本發明並未對其加以限定，熟習此技藝者可依實 際所需加以變化。 本發明係將發光元件配置於混光管之中，並使發光元 件所發出之光線在混光管內經由多次反射混光之後，由混 光管之二端出射，所以光線可於較短的距離內達成均勻混 光而使光源模組所出射之光線具有均勻的色度及輝度。由 此可知，本發明可縮小光源模組的體積而不影響其混光效 果。因此，本發明之背光模組的體積係較習知之背光模組 的體積小，因而能夠應用於輕薄化的顯示器中。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何熟習此技藝者，在不脫離本發明之精神 和範圍內，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爲準。 【圖式簡單說明】 圖1A繪示爲習知側面入光式之背光模組的側視剖面 示意圖。 圖1B繪示爲習知側面入光式之背光模組的立體示意 圖。 圖2A繪示爲本發明一較佳實施例的一種光源模組之 上視圖。 19 1300151 97-05-09 12916twfl.doc 圖2B則繪示爲圖2A所繪示之光源模組的側視剖面示 意圖。 圖3A至圖3C繪示爲依照圖2A及圖2B加以變化的背 光模組之上視圖。 圖4繪示爲本發明之另一實施例中的背光模組之上視 圖。 圖5A至圖5C繪示爲依照圖4加以變化之背光模組的 上視圖。 圖6繪示爲本發明一較佳實施例的一種背光模組之上 視圖。 圖7A至圖7D繪示爲依照圖6加以變化的背光模組之 上視圖。 圖8繪示爲本發明之一實施例的背光模組之上視圖。 圖9A繪示爲本發明之一實施例的背光模組之上視圖。 圖9B則繪示爲圖9A所繪示之光源模組之側視剖面 圖。 圖10繪示爲依照圖9A加以變化的背光模組之上視圖。 【主要元件符號說明】 100、200、400、600 :背光模組 102 :發光二極體 104 :混光元件 106、210、212、602、604 :光線轉向裝置 108 :導光板 Π0 :光入射截面 20 I3〇〇Ul 97-05-09 112、116、120 :光出射截面 118 :反射面 130、140 :光入射截面 204 :光源模組 206 :混光管 208 :發光元件 214 :第一端面 216 :第二端面 218、606 :第一光出射截面 220、608 :第二光出射截面 402、610 :擴散面 410 :第一散射兀件 420 :第二散射元件 800、900 :共用散射元件 21Doom twfl.doc 97-05-09 Two light steering device 6〇4. The first light exit section 606 of the first light redirecting device 6〇2 and the second light exit section 608 of the second light redirecting device 604 are then emitted into the scattering element 800. The interior of the scattering element 800 has, for example, a diffusing surface 610 such that light is incident on the scattering element 800. The light can be further mixed by the diffusing surface 610, and then incident on the light guiding element 202 by the light incident section 130. in. Finally, the light exiting section 120 of the light guiding element 202 is again emitted. Of course, those skilled in the art should know that the backlight module of this embodiment can also be modified as in the foregoing embodiment, and details are not described herein again. In another embodiment of the present invention, in addition to the configuration illustrated in FIG. 8, the backlight module having the scattering element may have another configuration method. FIG. 9A is a top view of a backlight module according to an embodiment of the invention. 9B is a side cross-sectional view of the light source module illustrated in FIG. 9A. Referring to FIG. 9A and FIG. 9B, the scattering element 900 is disposed at the light incident section 130 of the light guiding element 202, and the light mixing tube 206 of the light source module 204 is disposed below the scattering element. In this embodiment, the relative arrangement positions of the other components except the light mixing tube 206 are the same as those of the embodiment shown in FIG. 8, and details are not described herein again. It is to be noted that, in this embodiment, the light mixing tube 206 is disposed below the scattering element 900. However, in another embodiment, the light mixing tube 206 may be disposed below the light guiding element 202. Therefore, if the backlight module of the present invention is to be applied to a larger lighting device or a display, a plurality of sets of light source modules 204 may be disposed under the light guiding element 202, as shown in FIG. 10, so as to maintain the overall Under the premise that the area of the backlight module is unchanged, increase the brightness of the backlight module by adding 18 1300151 12916twfl.doc 97-05-09. Obviously, in this embodiment, the arrangement of the light source module 204 under the light guiding element 202 can be arranged in other ways, such as extending along a diagonal line, in addition to the parallel arrangement illustrated in FIG. Directions and so on. The invention is not limited thereto, and those skilled in the art can change it as needed. In the invention, the light-emitting element is disposed in the light mixing tube, and the light emitted by the light-emitting element is mixed by the multiple reflections in the light mixing tube, and then emitted from the two ends of the light mixing tube, so the light can be shorter. The uniform light is mixed within the distance to make the light emitted by the light source module have uniform chromaticity and brightness. It can be seen from the above that the present invention can reduce the volume of the light source module without affecting its light mixing effect. Therefore, the backlight module of the present invention is smaller in volume than the conventional backlight module, and thus can be applied to a slim and light display. While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present 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 side cross-sectional view showing a conventional side-lit backlight module. FIG. 1B is a perspective view of a conventional side-lit backlight module. 2A is a top view of a light source module in accordance with a preferred embodiment of the present invention. 19 1300151 97-05-09 12916twfl.doc FIG. 2B is a side cross-sectional view showing the light source module illustrated in FIG. 2A. 3A-3C are top views of the backlight module as modified in accordance with FIGS. 2A and 2B. 4 is a top view of a backlight module in another embodiment of the present invention. 5A-5C are top views of a backlight module that is modified in accordance with FIG. 4. FIG. 6 is a top view of a backlight module according to a preferred embodiment of the present invention. 7A-7D are top views of a backlight module as modified in accordance with FIG. 6. FIG. 8 is a top view of a backlight module according to an embodiment of the invention. FIG. 9A is a top view of a backlight module according to an embodiment of the invention. FIG. 9B is a side cross-sectional view of the light source module illustrated in FIG. 9A. FIG. 10 is a top view of a backlight module according to FIG. 9A. [Main component symbol description] 100, 200, 400, 600: backlight module 102: light emitting diode 104: light mixing element 106, 210, 212, 602, 604: light steering device 108: light guide plate Π 0: light incident cross section 20 I3〇〇Ul 97-05-09 112, 116, 120: light exit section 118: reflective surface 130, 140: light incident section 204: light source module 206: light mixing tube 208: light emitting element 214: first end surface 216 Second end face 218, 606: first light exit section 220, 608: second light exit section 402, 610: diffuser face 410: first scattering element 420: second scattering element 800, 900: common scattering element 21