201224602 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種背光模組與其組裝方法’尤指一種具有可提升 光利用率之導光塊之背光模組與其組裝方法。 【先前技術】 近來，隨著液晶顯示面板的發展，各種應用液晶顯示面板之電子 產品例如手機(MobilePhone)，個人數位助理(PDA)以及筆記型電腦 (Notebook)等的設計趨勢均朝向輕、薄、短、小發展。其中，薄型 化的電子產品更是受消費大眾所喜愛，因此用來提供背光源的背光 模組逐漸使用體積較小的發光二極體(LED)取代傳統體積相對較大 的冷陰極螢光燈管(CCFL)做為光源產生器，用以降低背光模組的體 積。因此，使用於液晶顯示器中之背光模組結構中的導光板也趨向 薄型化的设計。然而，由於薄型化的導光板與發光二極體間的厚度 差異過大，而導致兩者在組裝後的光利用率需進一步改善。 請參考第1圖。第1圖繪示了習知背光模組結構之剖面示意圖。 如第1圖所示’習知背光模組1G包含—導光板u以及複數個發光 -極體讀12設置於導歧u之_側邊。導光板u具有—入光面 $，且導光板11之入光面⑴具有一第一厚度m。各發光二極體 元件12具有-第二厚度112，且各發光二極體it件12之第二厚度 H2大於導光板U之入光面⑴的第一厚度m。因兩者間的厚度差 201224602 異’導致發光二極體元件12無法完全被導光板^之入光面^ ^ 覆蓋。因此，未被導光板U之人光面⑴所覆蓋之發光二極^ !2所發射之料规⑵無法直接軌導歧u之八光面丨 而造成光的損失，進轉低光的率。因此，f知背 ’ 的光利用率需進一步改善。 〜 【發明内容】 本發明之主要目的在於提供一背光模組與其組裳 背光模組的光利用率。 用以棱升 本發明之-較佳實施例提供—猶光，包含—基板， =:ΓΓ-發光元件。導光板具有—第-入光面，且第-入 先m厚度。導光塊具有一第二从轉 产且===第—入光面相對設置。第二出光面具有 三厚度，第二出光面之第二厚度小於或等 光元件盥第旱又且第一出光面破第一入光面所覆蓋。發 之一發光面被該第二入光面所涵蓋。—厚度且發先讀 本發明之又一較佳實施例 列步驟。提供—導 〃㈣7組裝方法，包括下 光面具有-第板，其中導光板具有1—人光面，且第一入 厚度。提供—導光塊，其中導光塊具有—第二入光 201224602 面”一第二出光面’第二出光面財 -第三厚度，且第二出光面之第—二’ 人光面具有 -厚度。接著，彻-光㉝胸/、於或等於第—人光面之第 第二出光面。複數個發 發光几件之第四厚度小於或等於第二人光面之該各 :發光元件與導光塊之第二入光面相件:後發 光面被第二人光面所涵蓋。 观MX件之-發 件血導光板之:光T中與其Γ裝方法藉由設置-個導光塊於發光元 之厚厚度雜 料鬼之出先面之厚度小於等於導光板之人光面之厚 又。褚此，使發光元件之發光面被導錢之 =光面被導光板之入光面所覆蓋，故可有效地二 之先導入導光板t，進而大巾|提升背賴組之胡用率。 咬為了使貴審查委員能更進一步了解本發明之特徵及技術内容， 請參閱以下有關本發明之詳細說明與關。細所_示僅供參考 與輔助說明用，並非用來對本發明加以限制者。 【實施方式】 為使熟售本發明所屬技術領域之一般技藝者能更近一步了解本 發明’下文㈣舉本發明之較佳實酬，並配合所附圖示 ，詳細說 明本發明的構成内容及所欲達成之功效。 201224602 睛參考第2A圖、第况圖與第3圖。第认圖输示了本發明一 ^較佳實施例之背光模組之上視示意圖，第犯圖為本發明一第 .組之變化實施例之上視蝴，請為沿 圖與第況圖之剖線a_a，繪示之背光模組 中受限於圖式繪示的角度不同，部分元件未繪示於部八圖式中/如 =圖、第2B圖與第3圖所示，本實施例之背光二〇包括一 導先板21、至少一導光塊22、複數個發光元件23、一反射板24(為 便於說明，第2A圖、第2B圖中未繪 反射板24(為 便於說明，第2A圖、第则中未^ ^框架25(為 -第-入&川盥@ ^未、、:θ不出鶴25)。導光板21具有 丄先面211與—第一出光面犯，而導光塊22且有一第一入 光面221與一第-屮氺而乐一入 产 第一出先面222。導光板21之-底面213、導光塊22 面223與發光元件23之—底面233係設置在同一水平面上。 導光塊22之第二出光面拉與導光板21之第 ^ 設W，且宴古祕n a你 光面211係相對 认置且料塊22之红A絲垃料触 所涵蓋，亦即第二出氺而^ ^ <乐八尤囱211 入弁+ 出光範圍係位於第-入光面211之 人由第二出光面222射出之光線可完全進入第一 入先面211。此外’導光板21之 而導光塊22之第-出光面222_ 211具有一第一厚度T1， 度Τ2與一第先面：與第二入光面功分別具有-第二厚 Τ2你，於^ 塊22之第二出光面222之第二厚度 T2係小於或等於導光板21之第— 實施例係以第二厚度τ 之—厚度T卜且本 此為限。各發Μ㈣形式為例說明，但不以 ，、有發光面231’且發光面231係與導光 201224602 之第二_入光面221相對設置。各發光元件23具有一第四厚度 、’，發光凡件23的第四厚度T4係小於或等於導光塊22之第二 光面221的第二厚度Τ3，且發光元件μ之發光面如會被第二 面221所/函蓋。本實施例係以第四厚度τ4等於第三厚度乃為 例《兄明’但不以此為限。藉由上述配置，發光元件Μ之發光面加 所發出的猶會完全經由第二人絲221進人導规U、再經由第 出光面222射出導光塊22並經由第一入光面叫進入導光板a〗， 最後再由導光板21的第一出光面加射出而提供給位於第-出光面 212上方的液晶顯示面板(圖未示)作為背光源使用。 # 在第2Α圖所緣示之實施例中，導光塊μ係為單一存在且設置 ;導光板21之相;/’但並不以此為限。舉例而言，如第2Β圖所繪 示之變化實_卿，導光塊U可域數存在，設置於發光元件 23與導光板21之間，且導光塊22的數目與設置位置可依發光元件 23之數目與設置位置隨行調整，。在本實施例中，發光元件^可為 例如發光二極體元件，但並不以此為限’亦可為其他各類型之發光籲 兀件，且亦不限定使频數個發光元件23而可制單—發光元件 23。舉例而言，發光元件23亦可為一燈管例如冷陰極營光燈管 (CCFL)或-設置有單—或魏娜統狀光帅咖㈣。另外， 框架25係設置於各發光元件23與導光塊22之上彳，且框架％具 有-反射面25卜藉此可將光線反射至導光塊22内部，以增加光利 用率。除此之外，在第二出光面扭之第二厚度T2料第一入光 面2U之第-厚度T1的實施態樣下，或是在發光元件23之第四厚 201224602 的作用 在其他實施例中’當使用第二出光面222之第二厚度T2小於第 入光面211之第-厚度T1之設計時，即使因為各元件的尺寸公 差或是於組裝過程中的對位不良情形，而導致組裳誤差發生時，藉 ❿由第二厚度T2小於第一厚度T1之設計仍可確保第二出光面從^ 出光範圍會位於第-入光面211之入光範圍内，而使經由導光塊^ 射出的光線會完全進入導光板21中，而不會發生光損失的情形但 不以此為限。另外，在其它實施例中，當使用發光元件23之第四厚 度丁4小於導光塊22之第二入光面221之第三厚度丁3的設計時， 即使因為各元件的尺寸公差或是於組裝過程中的對位不良情形所造 成的誤差發生時，藉由第四厚度Τ4小於第三厚度Τ3之設計，仍可 確保各發光元件23之發光面231 #出光範圍會位於導光塊22之第 擊二入光面221的入光範圍之内，而使得發光元件23所射出的光線能 完全進入導光塊22之第二入光面221中，而不會發生光損失的情形。 又’在本實施例中，導光塊22之剖面形狀類似—梯形，也就是 說’導光塊22之第二入光面221與第二出光面222為兩平行之平 面，導光塊22之底面223為一平面，而導光塊22之頂面具有 一内凹處，但不以此為限。例如在符合第二出光面222之第二厚度 Τ2小於或等於導光板21之第一入光面211之第一厚度丁丨的條件 9 201224602 下’以及在符合錄光元件23之第四厚度Τ3小於鱗於導光塊a 之第二入光副之第三厚度Τ3的條件下，導光塊22之剖面形狀 可為任-規則或不規則之幾何形狀。此外，在本實施例中將導光板 之底面2i3、導光塊22之底面如以及各發光元件^之底面说 設置於同-水平面上，可減少光傳遞路徑，同時亦可減㈣光傳遞 介質與折射率的不同而導致光的散射與折射而形成之光的損失，而 增加光的利用率。更可減少在組裝過程中屋生的對位 生。此外，導光㈣具有_第—娜_光塊 ^= 解。導細之第二折射率較佳小於導光㈣ 二折 =此:使經由導光塊22之光線更為針進人導光板 光損失的可能性，但不以此A(ip , 減夕 率亦可等於導光板2Γ之第t射Γ導光塊22之第二折射 折射而造成繼，懈，編導致光 入^之第：編222與_^ =面2丨丨—光科26妨減 * ( =?=23間亦-光學膠心二 膠26 29具有良好的透光性與雜 =第一折射㈣， 於導光板2!之第一折射率 第一折射率，或是相荨 塊22盥導光板21 θ & |中’各發光元件23、導光 ”導先板W物26、29物合，妨以此為限。 201224602 舉例而言，各發光元件23、導光塊22與導光板2 二計:=進行結合’例如在不使用光學膠26、29進行點== ¥光束22之第二出光面222可與導光板21之第一 ^接接觸’且導光塊22之第二入光面切亦可與各發光 發光面231直接接觸。 千23之 "為了增加光利用率及光擴散效果，本發明之導光塊22之第二出 光面222亦可叹置有表面結構。請參考第Μ圖與第犯圖。第4八 $為本發狀-實施例之導親與發光元件之局毅衫意圖，而 4犯圖為第4A圖之導光塊與發光元件之剖面示意圖。如第 與第4B圖所示，導光塊22之第二入光面221設置有表面結構，且 在本實施例中’各表面結構係為一凹槽22M，凹槽22M的數量可與 發光元件23的數目對應，骑光元件23可嵌人導光塊22之第二二 光面221之凹槽綱中。藉此，即使發光元件23具有部分側时 =的出光’亦可有效射人導域22内而可增域糊率。請再參考 第从圖與第SB圖。第SA圖為术發明之另一實施例之導光塊與發 光元件之局部放大示意圖，而第5B圖為第5A圖之導光塊與發光元 件之剖面示意圖。如第5A圖與第5B圖所示，在本實施例中，各表 面結構係為-凸塊22S，位於導光塊22之第二入光面221上，用以 集中各發光元件23所產生的光線，以增加光的利用率。 本發明之背光模組並不以上述實施例為限。下文將介紹本發明之 其他較佳實施狀背光餘，且為了便概較各實關之相異處並 201224602 簡化S尤明，在下文之各實施例中使用相同的符號標註相同的元件， 且主要針對各實施例間相異處進行說明，而不在對重複部分加以贅 述0 請參考第6圖。第6圖繪示了本發明另一較佳實施例之背光模組 之剖面不意圖。如第6圖所示，相較於前述實施例，在本實施例之 變化型中，導光塊22係為上下顛倒設置，亦即導光塊22之底面223 從《•又置於第3圖所示之面對反射板24的位置改為設置於面對框架 25的位置，且背光模組2〇之導光塊22之一底面223與導光板b 之-頂面214(亦即導光板21之第—出光面)位於同—水平面上。在 b配置下，由於導光塊22之頂面224會面對反射板24而使得頂面 以之内凹處會形成一空間’故可將背光模組2()之驅動元件π，例 如-電路板，置入該空間内’藉以減小整體背光模组2〇的組裝體積。 請參考第7圖至第1〇圖。第7圖至第1〇圖為本發明一較佳實施 例之背光模組之組裝方法之示意圖。如第7騎示，首先提供一導 ^板以，並將一光學膠26黏貼在導光板21之第一入光面2U'。接 者，如第8圖所示，將黏貼有光學膠26之導光板21及―導光塊^ 玫置於-平台27上，使導光板21之一底面213與導光塊22之—底 面=23位於同-水平面上，肋減纽糾所造成之對位誤差。再 妾著，將導光塊22之第二出光面222與黏貼有光轉％之導光板 =之第-入光面2U相對貼合。如第9圖所示，隨後提供複數個發 先讀23 ’並個-光學膠29將各發光元件Μ之發光面故轉 201224602 於導光塊22之第二入光面221。此外，本實施例之背光模組之組裝 方法可另包括提供一反射板24，並將反射板24設置於導光板21之 底面213與導光塊22之底面223。如第1〇圖所示，本實施例之背 光模組之組裝方法可另包括提供一框架25，其中框架25具有一反 射面251，並將框架25設置於各發光元件23與導光塊22之上方， ^框架25之反射面w與各發光元件μ與導錢22相對設置，則 完成此一背光模組2〇。 一三一 本發明之背光模組之組裝方法並不以上述實施例為限。舉例而 ’在利用絲戦合導敍與導級的步财 膠黏合導光板之第-人光面，再 膠之另齡之，柯先絲轉顧在導 /在先干 再將導歧之第-从_合料級之第二岐面，=^面’ 接合導域鱗妹H 樣了達到 綜上所述’在本發明之背光模組中，於發光元件 置導光塊，歸導光塊之第二出光面之第二厚度小設 之第一入光面之第-厚度’以及發光元件之第四厚度光板 2之第二人光面之第三厚度的條件下，可有欵減線導 的發散所造成的光敏，細增加光關科。桃於傳遞時 乂上所述僅林㈣之較佳實酬，凡依本 做之均等變化與修飾，皆綱本發明之涵蓋範圍。4利範圍所 13 201224602 【圖式簡單說明】 第1圖為習知背光模組結構之剖面示意圖。 第2A_示了本發明一第一較佳實施例之背光模組之上視示意圖。 第邡圖為本發明一第二較佳實施例之背光模組之變化實施例之上 視不意圖。 第3圖為沿第2A圖與第2B圖之剖線a_a，緣示之背光模組的剖面 不意圖。 第4A圖為本發明之-實施例之導光塊與發光元件之局部放大示意 圖。 第4B圖為第4A圖之導光塊與發光元件之剖面示意圖。 第5A圖為本發明之另-實施例之導光塊與發光元件之局部放大示 意圖。 第5B圖為第5A圖之導光塊與發光元件之剖面示竞圖。 第6圖緣示了本發明另-較佳實施例之f光模組之剖面示意圖。 第7圖至第10圖為本發明一較佳實施例之背光模組之組裝方=— 意圖。 、’ 、/之示 【主要元件符號說明】 10 背光模組 11 導光板 12 發光二極體元件 111 入光面 121 光線 H1 第一厚度 H2 第二厚度 20 背光模組 14 201224602 21 導光板 22 導光塊 23 發光元件 24 反射板 25 框架 26, 29 光學膠 27 平台 211 第一入光面 212 第一出光面 213 底面 214 頂面 221 第二入光面 222 第二出光面 223 底面 224 頂面 22Μ 凹槽 • 22S 凸塊 231 發光面 251 反射面 28 驅動元件 ΤΙ 第一厚度 Τ2 第二厚度 Τ3 第三厚度 Τ4 第四厚度 15201224602 VI. Description of the Invention: [Technical Field] The present invention relates to a backlight module and a method of assembling the same, and more particularly to a backlight module having a light guiding block capable of improving light utilization efficiency and an assembling method thereof. [Prior Art] Recently, with the development of liquid crystal display panels, design trends of various liquid crystal display panel electronic products such as mobile phones, personal digital assistants (PDAs), and notebooks (Notebooks) have been oriented toward light and thin. Short, small development. Among them, thin electronic products are more popular among consumers, so the backlight module used to provide backlights gradually replaces the traditionally relatively large cold cathode fluorescent lamps with smaller light-emitting diodes (LEDs). A tube (CCFL) is used as a light source generator to reduce the volume of the backlight module. Therefore, the light guide plate used in the backlight module structure of the liquid crystal display also tends to be thinner. However, since the thickness difference between the thinned light guide plate and the light emitting diode is too large, the light utilization efficiency of both after assembly is further improved. Please refer to Figure 1. FIG. 1 is a cross-sectional view showing the structure of a conventional backlight module. As shown in Fig. 1, the conventional backlight module 1G includes a light guide plate u and a plurality of light-emitting body readings 12 disposed on the side of the guide u. The light guide plate u has a light entrance surface $, and the light incident surface (1) of the light guide plate 11 has a first thickness m. Each of the light-emitting diode elements 12 has a second thickness 112, and a second thickness H2 of each of the light-emitting diodes 12 is greater than a first thickness m of the light-incident surface (1) of the light guide plate U. Due to the difference in thickness between the two 201224602, the light-emitting diode element 12 cannot be completely covered by the light-emitting surface ^^ of the light guide plate. Therefore, the material gauge (2) emitted by the light-emitting diodes 2, which are not covered by the light surface (1) of the light guide plate U, cannot directly cause the loss of light, and the rate of light into the low light. . Therefore, the light utilization rate of the latter is further improved. ~ [ SUMMARY OF THE INVENTION] The main object of the present invention is to provide light utilization efficiency of a backlight module and its group backlight module. For the purpose of the invention - the preferred embodiment provides - a juxta, comprising - a substrate, =: ΓΓ - illuminating element. The light guide plate has a -th-into-light surface, and the first-first m thickness. The light guiding block has a second secondary conversion and the === first-into-light surface is oppositely disposed. The second illuminating surface has three thicknesses, and the second thickness of the second illuminating surface is smaller than or equal to that of the optical element, and the first illuminating surface is covered by the first illuminating surface. One of the light emitting faces is covered by the second light incident surface. - Thickness and Read First Another preferred embodiment of the invention is a list of steps. Providing a guide (4) 7 assembly method, comprising: a lower surface having a -th plate, wherein the light guide plate has a 1-person smooth surface and a first entrance thickness. Providing a light guiding block, wherein the light guiding block has a second second light 201224602 surface "a second light emitting surface" a second light emitting surface - a third thickness, and the second light surface of the second light emitting surface has - Thickness. Next, the light-light 33 chest / is equal to or equal to the second light-emitting surface of the first human light surface. The fourth thickness of the plurality of light-emitting parts is less than or equal to the second human light surface: the light-emitting element The second light-incident surface of the light guide block: the rear light-emitting surface is covered by the second human light surface. The MX--the hair light guide plate: the light T and its armoring method are set by a light guide The thickness of the thick surface of the illuminating element is less than or equal to the thickness of the light surface of the light guide plate. Therefore, the light emitting surface of the light emitting element is guided by the light surface. Covered, so it is possible to effectively introduce the light guide plate t first, and then increase the rate of use of the group. In order to enable the review committee to further understand the features and technical contents of the present invention, please refer to the following The detailed description and the details of the present invention are shown for reference and auxiliary explanation only, not for use. The invention is not limited thereto. [Embodiment] The present invention will be more fully appreciated by those skilled in the art to which the present invention pertains. DETAILED DESCRIPTION OF THE INVENTION The contents of the present invention and the effects to be achieved are described in detail. 201224602 The reference to Fig. 2A, the conditional view and the third figure. The first figure shows the top view of the backlight module of a preferred embodiment of the present invention. The schematic diagram of the first embodiment of the present invention is a variation of the embodiment of the present invention. Please refer to the angle a_a along the diagram and the conditional diagram, and the angle of the backlight module is limited by the drawing. Different parts are not shown in the figure 8 or as shown in FIG. 2, FIG. 2B and FIG. 3, and the backlight unit of the embodiment includes a guiding plate 21, at least one light guiding block 22, and plural Light-emitting elements 23 and a reflecting plate 24 (for convenience of explanation, the reflecting plates 24 are not shown in FIGS. 2A and 2B (for convenience of explanation, FIG. 2A, the second is not ^^ frame 25 (for - first-in & Chuanxiong @^未,,:θ不出鹤25). The light guide plate 21 has the first surface 211 and the first light surface, and the guide The light block 22 has a first light incident surface 221 and a first light output surface 222. The bottom surface 213 of the light guide plate 21, the light guide block 22 surface 223 and the light emitting element 23 - the bottom surface 233 The second light-emitting surface of the light-guiding block 22 is pulled and the second light-guide plate 21 is set, and the glazed surface of the light guide plate 21 is relatively recognized and the red A wire material of the block 22 is disposed. Covered by the touch, that is, the second exit and ^ ^ < Le Ba Youshou 211 into the 弁 + light-emitting range is located in the first-into-light surface 211, the light emitted by the second light-emitting surface 222 can completely enter the first into The first surface 211. In addition, the first light-emitting surface 222_211 of the light guide block 22 has a first thickness T1, the second surface and the second light-incident surface have a second thickness. The second thickness T2 of the second light exit surface 222 of the block 22 is less than or equal to the thickness of the second thickness τ of the first embodiment of the light guide plate 21 and is limited thereto. Each of the hairpins (four) forms is described as an example, but the light-emitting surface 231' is not provided, and the light-emitting surface 231 is disposed opposite to the second light-incident surface 221 of the light guide 201224602. Each of the light-emitting elements 23 has a fourth thickness, 'the fourth thickness T4 of the light-emitting elements 23 is less than or equal to the second thickness Τ3 of the second light-surface 221 of the light-guiding block 22, and the light-emitting surface of the light-emitting element μ is as Covered by the second side 221 / letter. In this embodiment, the fourth thickness τ4 is equal to the third thickness, which is an example of "brother" but not limited thereto. With the above configuration, the light-emitting surface of the light-emitting element 加 is emitted by the second wire 221, and then exits the light guide block 22 via the first light-emitting surface 222 and enters through the first light-incident surface. The light guide plate a is finally applied to the first light-emitting surface of the light guide plate 21 and supplied to the liquid crystal display panel (not shown) located above the first light-emitting surface 212 as a backlight. # In the embodiment shown in the second drawing, the light guiding block μ is singularly present and disposed; the phase of the light guiding plate 21; /' but not limited thereto. For example, as shown in FIG. 2, the light guide block U can exist in the field, and is disposed between the light-emitting element 23 and the light guide plate 21, and the number and arrangement position of the light guide block 22 can be determined. The number of the light-emitting elements 23 and the set position are adjusted as they are. In this embodiment, the light-emitting element ^ can be, for example, a light-emitting diode element, but it is not limited thereto. It can also be other types of light-emitting elements, and is not limited to a plurality of light-emitting elements 23. A single light-emitting element 23 can be fabricated. For example, the light-emitting element 23 can also be a light tube such as a cold cathode camp light tube (CCFL) or a single- or Wei Na-like light-sharp coffee (four). In addition, the frame 25 is disposed on each of the light-emitting elements 23 and the light-guiding block 22, and the frame % has a reflection surface 25, thereby reflecting light to the inside of the light-guiding block 22 to increase the light utilization rate. In addition, in the embodiment in which the second thickness T2 of the second light-emitting surface is twisted, the first thickness-thickness T1 of the first light-incident surface 2U, or the fourth thickness 201224602 of the light-emitting element 23 is used in other implementations. In the example, when the second thickness T2 of the second light-emitting surface 222 is smaller than the first-thickness T1 of the first light-incident surface 211, even due to the dimensional tolerance of each component or the misalignment during assembly, When the stacking error occurs, the design of the second thickness T2 is smaller than the first thickness T1 to ensure that the second light exiting surface is located in the light incident range of the first light incident surface 211. The light emitted by the light block ^ will completely enter the light guide plate 21 without the occurrence of light loss, but is not limited thereto. In addition, in other embodiments, when the fourth thickness 4 of the light-emitting element 23 is used is smaller than the design of the third thickness 3 of the second light-incident surface 221 of the light-guiding block 22, even due to dimensional tolerances of the components or When the error caused by the misalignment in the assembly process occurs, the design of the fourth thickness Τ4 is smaller than the third thickness Τ3, and the light-emitting surface 231 of each of the light-emitting elements 23 can be ensured to be located in the light-guiding block 22 The light hitting the light incident surface of the light-emitting element 23 can completely enter the second light-incident surface 221 of the light-guiding block 22 without occurrence of light loss. In the present embodiment, the cross-sectional shape of the light guiding block 22 is similar to that of the trapezoid, that is, the second light-incident surface 221 and the second light-emitting surface 222 of the light guiding block 22 are two parallel planes, and the light guiding block 22 The bottom surface 223 is a flat surface, and the top mask of the light guide block 22 has a recess, but is not limited thereto. For example, under the condition that the second thickness Τ2 of the second illuminating surface 222 is less than or equal to the first thickness 211 of the first light incident surface 211 of the light guide plate 21, and under the fourth thickness Τ3 of the recording element 23 The cross-sectional shape of the light guide block 22 may be any-regular or irregular geometry under the condition that the scale is smaller than the third thickness Τ3 of the second entrance light pair of the light guide block a. In addition, in the embodiment, the bottom surface 2i3 of the light guide plate, the bottom surface of the light guide block 22, and the bottom surface of each of the light-emitting elements are disposed on the same-horizontal surface, thereby reducing the light transmission path and reducing the (four) optical transmission medium. The loss of light due to the difference in refractive index resulting in scattering and refraction of light increases the utilization of light. It can also reduce the alignment of the house during the assembly process. In addition, the light guide (4) has a _D-Na_光块^= solution. The second refractive index of the guide is preferably smaller than the light guide (4). Twist==: the possibility of light passing through the light guide block 22 is more likely to enter the light guide of the light guide plate, but not by A (ip, eve rate) It can also be equal to the second refraction and refraction of the t-th illuminating light guide block 22 of the light guide plate 2, causing the continuation, and the result of the light-inducing is: 222 and _^ = face 2 丨丨 - 光科26 * ( =?=23 also - optical rubber two glue 26 29 has good light transmission and miscellaneous = first refraction (four), the first refractive index of the light guide plate 2! first refractive index, or phase block In the 22 盥 light guide plate 21 θ & | the 'each light-emitting element 23, the light guide' guide plate W objects 26, 29 are combined, which may be limited thereto. 201224602 For example, each light-emitting element 23, light guide block 22 And the light guide plate 2: = combines 'for example, without using the optical glue 26, 29 for the point == ¥ the second light exit surface 222 of the light beam 22 can be in contact with the first light guide plate 21' and the light guide block 22 The second light-incident surface can also be in direct contact with each of the light-emitting surface 231. In order to increase the light utilization efficiency and the light diffusion effect, the second light-emitting surface 222 of the light guide block 22 of the present invention can also be slanted. There is a surface structure. Please refer to the figure and the first figure. The 4th and 8th dollars are the hairpins of the hairline-invention and the light-emitting component of the embodiment, and the 4th map is the light guide block of Figure 4A. A cross-sectional view of the light-emitting element. As shown in FIG. 4B, the second light-incident surface 221 of the light guide block 22 is provided with a surface structure, and in the embodiment, each surface structure is a groove 22M, and the groove is The number of 22M may correspond to the number of the light-emitting elements 23, and the light-riding element 23 may be embedded in the groove of the second light-emitting surface 221 of the light-guiding block 22. Thereby, even if the light-emitting element 23 has a partial side = light output 'It can also be effectively shot into the guide field 22 to increase the domain paste rate. Please refer to the second and eighth SB diagrams. The SA is a partial enlarged view of the light guide block and the light-emitting element of another embodiment of the invention. 5B is a cross-sectional view of the light guide block and the light-emitting element of FIG. 5A. As shown in FIGS. 5A and 5B, in the present embodiment, each surface structure is a bump 22S located at the light guide. The second light incident surface 221 of the block 22 is used to concentrate the light generated by each of the light-emitting elements 23 to increase the utilization of light. The backlight module is not limited to the above embodiments. The backlights of other preferred embodiments of the present invention will be described below, and in order to compare the differences between the actual implementations and the 201224602 simplified S Uming, in the following The same elements are denoted by the same reference numerals in the embodiments, and the description will be made mainly for the differences between the embodiments, and the repeated parts will not be described. Please refer to FIG. 6. FIG. 6 illustrates another comparison of the present invention. The cross-section of the backlight module of the preferred embodiment is not intended. As shown in FIG. 6, in the variation of the embodiment, the light guiding block 22 is upside down, that is, the light guiding block. The bottom surface 223 of the 22 is changed from the position facing the reflection plate 24 shown in FIG. 3 to the position facing the frame 25, and the bottom surface 223 of the light guide block 22 of the backlight module 2 is The top surface 214 of the light guide plate b (i.e., the first light exit surface of the light guide plate 21) is located on the same-horizontal surface. In the b configuration, since the top surface 224 of the light guiding block 22 faces the reflecting plate 24 such that the top surface has a space formed therein, the driving element π of the backlight module 2 can be π, for example - The board is placed in the space to reduce the assembly volume of the overall backlight module 2〇. Please refer to Figure 7 to Figure 1 for details. 7 to 1 are schematic views showing a method of assembling a backlight module according to a preferred embodiment of the present invention. For example, in the seventh riding, a guide plate is first provided, and an optical adhesive 26 is adhered to the first light incident surface 2U' of the light guide plate 21. As shown in FIG. 8, the light guide plate 21 and the light guide block to which the optical adhesive 26 is adhered are placed on the platform 27, and one bottom surface 213 of the light guide plate 21 and the bottom surface of the light guide block 22 are provided. =23 is located on the same-horizontal plane, and the rib reduces the alignment error caused by the correction. Further, the second light-emitting surface 222 of the light guide block 22 is bonded to the first light-incident surface 2U of the light guide plate to which the light is transferred. As shown in Fig. 9, a plurality of pre-reading 23' and optical glues 29 are provided to turn the light-emitting surface of each of the light-emitting elements 2012201224602 to the second light-incident surface 221 of the light guide block 22. In addition, the assembly method of the backlight module of the present embodiment may further include providing a reflector 24 and disposing the reflector 24 on the bottom surface 213 of the light guide plate 21 and the bottom surface 223 of the light guide block 22. As shown in FIG. 1 , the assembly method of the backlight module of the embodiment may further include providing a frame 25 , wherein the frame 25 has a reflective surface 251 and the frame 25 is disposed on each of the light-emitting elements 23 and the light guide block 22 . Above, the reflection surface w of the frame 25 is disposed opposite to the light-emitting elements μ and the guide money 22, and the backlight module 2 is completed. The assembly method of the backlight module of the present invention is not limited to the above embodiment. For example, 'the first person's glossy surface of the light-adhesive bonding light guide plate using the silk and silk guide and the guide level, and the other age of the glue, Ke Xiansi turns to the guide / the first dry and then the guide - From the second side of the _feeding level, the =^ surface 'the joint guide scales the scale H to the above. In the backlight module of the present invention, the light block is guided by the light-emitting element, and the light block is guided. Under the condition that the second thickness of the second light-emitting surface is smaller than the first thickness of the first light-incident surface and the third thickness of the second-thick light surface of the fourth thickness light-emitting panel 2, there may be a reduction line The light caused by the divergence of the guide light increases the light Guanke. When the peach is delivered, the preferred remuneration of the forest (4) mentioned above is the scope of the present invention. 4 Scope of the range 13 201224602 [Simple description of the diagram] Figure 1 is a schematic cross-sectional view of a conventional backlight module structure. 2A is a top plan view of a backlight module according to a first preferred embodiment of the present invention. The first drawing is a schematic view of a modified embodiment of a backlight module according to a second preferred embodiment of the present invention. Fig. 3 is a cross-sectional line a_a along the 2A and 2B, and the cross-sectional view of the backlight module is not intended. Fig. 4A is a partially enlarged schematic view showing a light guiding block and a light-emitting element of the embodiment of the present invention. Fig. 4B is a schematic cross-sectional view of the light guiding block and the light emitting element of Fig. 4A. Fig. 5A is a partially enlarged plan view showing a light guiding block and a light emitting element according to another embodiment of the present invention. Fig. 5B is a cross-sectional view of the light guiding block and the light emitting element of Fig. 5A. Figure 6 is a cross-sectional view showing the optical module of another preferred embodiment of the present invention. 7 to 10 are assembly views of a backlight module according to a preferred embodiment of the present invention. , ' / / display [ main component symbol description ] 10 backlight module 11 light guide plate 12 light emitting diode element 111 light incident surface 121 light H1 first thickness H2 second thickness 20 backlight module 14 201224602 21 light guide 22 guide Light block 23 Light-emitting element 24 Reflector 25 Frame 26, 29 Optical glue 27 Platform 211 First light-incident surface 212 First light-emitting surface 213 Bottom surface 214 Top surface 221 Second light-incident surface 222 Second light-emitting surface 223 Bottom surface 224 Top surface 22Μ Groove • 22S Bump 231 Light-emitting surface 251 Reflecting surface 28 Driving element ΤΙ First thickness Τ 2 Second thickness Τ 3 Third thickness Τ 4 Fourth thickness 15