201219919 PT1975 35552twf.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光源’且特別是有關於一種背光 模組。 【先前技術】 現有採用發光二極體（light-emitting diode, LED)為 光源的直下式背光模組，因LED的效率隨著技術的進步而 提升，因此可使用較少數量的LED即可達到直下式背光模 組所欲提供之光學輝度的要求。然而，因使用LED數量減 、，且直下式为光模組厚度不可過厚的限制下會衍生出 直下式背光模組晝面亮暗不均的問題。 -般來說’為了解決直下式背光模組晝面亮暗不均的 問題’可於LED上方設置發散魏，如此一來可降低直下 式背光模_厚度，並使晝雜為均自。然而，直下式背 光模組的碰馳仍無从式LED背賴組厚度相差 甚多，直下式背光模組的厚度約為側从式LED背光模 倍。、因此’如何有效地降低直下式㈣背光模組 、-旱度以達到輕薄的目的，並提升與彳狀光式背 光模組的競爭力，實為眾人所關注的焦點。 0 Γ華民國專利公開第200916845號揭露了適用於直下 1Γ,二模組的反射丨材，具有凸部作為反射面。_華民國 組：i】二2::976號揭露了液晶顯示裝置包括背光模 ^牟月ΐίΐ發光組件，發光組件包括具收容空間的 “、、m數個發光二極體晶#及具錢數規則排 201219919 PT1975 35552twf.doc/n 列之通孔的反射片。中華民國專利第M371308號揭露了發 光二極體模組中之發光二極體之上設置有二次透鏡。中華 民國專利第M332861號揭露了一種背光模組，包括一燈 箱、複數個光源及複數個反射物。中華民國專利公開第 200919779號揭露了多晶型發光二極體封裝結構，其中在 發光二極體晶片之間設有角錐狀結構。中華民國專利第 M302040號揭露了背光模組包括燈箱、燈源、擴散板及支 撐件。中華民國專利第M362428號揭露了一種背光模組， 包括背板結構、複數個光源、電路板及至少一光學膜片。 中華民國專利第1265749號揭露了一種背光裝置，包括一 殼體、複數個發光二極體、至少一電路板、一擴散板、一 反射片及錐狀凸出物。 【發明内容】 ，本發明提供一種背光模組，此背光模組可提供均勻的 面光源，且可具有較薄的厚度。 、 參 ^發明的其他目的和優點可以從本發明所揭露的技 術特徵中得到進一步的了解。 明夕ίί上述之—或部份或全部目的或是其他目的，本發 光元:Ϊ例提出—種背光模組，包括—背板、複數個發 此發弁]/ 一反射錐、一擴散板及複數個擴散圖案。這 於背板上，且分別適於提供複數個光束。 板配置於斤此恭止^ A 曰]擴散 罝心些發TbTG件與反射錐上方，其巾這些發光元件 201219919 FI-iy75 35552twf.doc/n 與反射錐配置於背板與擴散板之間。這些擴散圖案設置於 擴散板之面向背板的—表面，其中這些擴散圖案在這些發 光兀件的正上方㈣散板之單位面積的面積比大於這些擴 散圖1在反射錐的正上方佔擴散板之單位面積的面積比。、 綜上所述，本發明之實施例的背光模組至少具有下列 其卜個優點：由於本發明之實施例的背光模組採用擴散 圖案搭配反射義設計，因此發光元件所發&的部分光束 適於依序被擴制案歧祕反射，並且傳遞至擴散板之 對應於相㈣光元件之_區域^此—來，可使發光元 件的正上方之亮度*會過高，進而提升背絲組所提供之 面光源之均勻度。 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】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之-較佳實施_詳細朗巾，將可清 楚的呈現。以下實施例中所提到的方向用語，例如：上、 二左、右、前或後等，奸參考附加圖式的方向。因此， 使用的方向用語是用來說縣_來限制本發明。 圖1為本發明-實施例之背光模組的局部上視圖，圖 ΐ沿圖1 t AA’線所繪示之背光模組的局部剖面示意 圖，圖2B為圖2A中的發光元件、反射 視示意圖’其中為了方便說明，圖H 镜的上 圃1僅繪不出擴散板及設 201219919 PT1975 35552twf.doc/n 置其上的網點分佈，其中省略了其他可能的膜層及結構。 請同時參考圖1、圖2A與圖2B，本實施例之背光模組1〇〇 包括複數個發光元件112 (例如圖2B所繪示之發光元件 112a、112b、112c、112d)、複數個發散透鏡122 (例如 圖2B所繪示之發散透鏡122a、122b、122c、122d)、— 擴散板130、至少一反射錐17〇(在本實施例中是以複數個 反射錐170為例）及一背板150。發光元件112設置於背 板150上’且分別適於提供複數個光束L1，且任二相鄰之 發光元件112 (例如發光元件112a與112b’或例如發光元 件112b與112d’或例如發光元件ii2c與ii2d，或例如發 光元件112a與112c)的中心位置C1相距為L。在本實施 例中’ L的距離例如為50公釐(millimeter, mm)，然本發明 不限制於此，L的距離可依使用者需求加以調整。在本實 施例中，發光元件112是以發光二極體元件作為舉例說 明。此外’圖1雖繪示出背光模組100的局部上視圖，且 於圖1中發光元件的數量為超過二個，然圖1僅為舉例說 明’非用以限定本發明之發光元件的數量。換言之，於一 貫施例中，發光元件的數量亦可僅為兩個。在本實施例中， 發光元件112的數量超過4個，反射錐170的數量為2個 以上，且這些反射錐穿插於這些發光元件112之間。 此外，反射錐170配置於背板15〇上，且穿插於這些 發光元件112之間。另外，發散透鏡122分別對應設置於 發光元件112的上方’如圖2A所示。在本實施例中，發 散透鏡122可使發光元件112所提供的光束L1更進一步 7 201219919 ΡΪ1975 35552twf.d〇c/n mr夕：而使光束u分別在通過發散透鏡122後， 光束L1之發散角度可變 大（亦即先束L1照射在擴散板 圍變大)’也就是光束U之入射角度Θ可變 ▲ 士 a所不’其中圖3為圖2A之局部放大圖。舉例 ^所例所制之發散透鏡122可使每-發光元件 ，、、光束L1在通過對應的每一發散透鏡122後， ίΐΓ,η人射至擴散板m之人射角度0實質上可落在大 專G度與小於等於8G度之間。在本實施例中，上述 的入射角度0疋義為光束L1與擴散板之法線见的夹 角，如圖3所示。 ，請繼續參考圖卜圖2A與圖2B，擴散板13〇配置於 發光兀件112與反射錐17〇上方，其中發光元件112與反 射錐170酉己置於背板15〇與擴散板13〇之間。在本實施例 中，擴散板130設置於發散透鏡122的上方。此外，在本 實施例中，背光模組100包括複數個擴散圖案（例如為複 數個網點140)，設置於擴散板13〇之面向背板15〇的一 表面132，其中這些擴散圖案（例如網點140)對應發光元 件112。在本實施例中，反射錐17〇例如為多角錐。在圖 2B中，疋以反射錐170為四角錐為例，且四個相鄰的發光 元件112之間穿插有一個反射錐在本實施例中，相 鄰於反射錐170的這些發光元件112落在反射錐17〇的稜 線174於背板150上的正投影之延伸線174,上，但本發明 不以此為限。 在本實施例中，發光元件112所發出的光束U會有 201219919 PT1975 35552twf.doc/n -部分穿透發光元件112上方的擴散圖案（例如網點刚 及擴散板130，並傳遞至背光模組1〇〇外。然而，也有另 -部分的光束U被發光元件112上方的擴散圖案反射至 反射錐170,反射錐170適於將此部分的光束u反射至擴 散板130之對應於相鄰發光元件112之間的區域，並使光 束L1通過此區域且傳遞至背光模組1〇〇外。如此一來， 發光元件112正上方的光束便不會過強，以使背光模組1〇〇 可提供均勻的面光源。再者，在-實施例中，發光元件！ 12 所發出的-部分的光束L1亦可以在通過發散透鏡122後 直射反射錐170，並且被反射錐m反射至擴散板13〇之 對應於相鄰發光元件112之間的區域，進而提升背光模組 100所提供的面光源之均勻度。在本實施例中，反射錐17〇 具有錐面172 (例如錐面172a、172b、172c、172d)，錐 面172適於將光束LI反射。 另^卜，背光模組100更可包括有一反射單元16〇，其 中反射單元160配置於背板15〇上，並位於發光元件112 癱的周邊如圖2A所示。在本實施例中，反射單元“ο例 如為一反射片或一反射膜，且反射錐17〇設置於反射單元 I60上。在本實施例中，擴散板130與反射單元160的一 間距為Η，且背光模組100滿足〇.i‘H/Lg〇.45。 洋細而言’擴散板130相對於反射單元160的間距Η 通中可定義為光束L1傳遞至擴散板13〇之混光的距離。 以光學的角度而言，間距Η若越大則光束L1在通過擴散 板130後會具有較佳的光均勻度，然而，間距Η若過大時 201219919 PT1975 35552twf.doc/n 將造成背光模組10 0之整體厚度無法被有效地降低以及整 體出光亮度亦會相對地減弱；間距Η若過小卻又會造成背 光模組100所提供的面光源之光均勻度不佳。因此，為了 可有效地降低背光模組100的整體厚度並同時提供較佳的 光均勻度’本實施例之背光模組100使用上述擴散圖案搭 配反射錐170的設計，藉以在較小的間距Η下達到均勻的 面光源。此外，本實施例之背光模組1〇〇使用上述的發散 透鏡122以使發光元件112所提供的光束L1之入射角度 0在通過發散透鏡122後變大，可進一步地縮小擴散板13〇 相對於反射單元160的間距Η，也就是上述所提及的混光 距離。換言之，上述設計可使背光模組1〇〇滿足0.GH/L S0.45的條件，進而使背光模組1〇〇具有輕薄的優點。 值得一提的是，由於本實施例採用發散透鏡122藉以 增大光束L1在傳遞至擴散板130時的入射角度0，因此 任二相鄰的發光元件112之間距L便可相對較大，換言 之’背光模組100在提供相同的背光面積下可使用數量較 少的發光元件112且仍可呈現較佳的光均勻度。需要注意 的是，背光模組100在使用數量較少的發光元件112的情 況下’由於本實施例是透過設置多個網點140於擴散板13〇 上’以降低擴散板130相對反射單元160的間距Η，從而 可維持光束L1出射於擴散板130的出光亮度。換言之， 本實施例之背光模組100可在降低整體厚度及使用發光元 件112的數量較少之情況下，仍可提供適當的亮度與光均 勻度。 201219919 PT1975 35552twf.doc/n 以下將進一步地舉例說明位於擴散板丨30上的擴散圖 案（例如網點140)之分佈情況與可產生的功效。 在圖1與圖2A中，擴散圖案（例如網點14〇)在這 些發光兀件112的正上方佔擴散板13〇之單位面積的面積 比大於擴散圖案（例如網點14〇)在反射錐17〇的正上方 佔擴散板130之單位面積的面積比。舉例而言，位於擴散 板130上的這些網點14〇隨著遠離相對應的發光元件ιΐ2 ^心位置C1由密到疏排列，如此便可使上述面積比隨 著遠離中心位置C1而遞減，如圖2A所示。詳細而言，擴 散板130上可依據使用者的需求而劃分至少二網點區塊 P1，其中每一網點區塊P1會對應於每一發光元件112所 在位置，且每一網點區塊P1上配置有複數個網點140，如 圖2入所不。其中，關於每一網點區塊P1内之網點14()的 排列，式可以是採用如圖2A所繪示之排列方式，也就是 說，每一網點區塊P1的中心位置C2可對應於每一發光元 件112的中心位置c卜且位於網點區塊P1上的這些網點 • 會隨著遠離網點區塊P1的中心位置C2由密到疏排列。 進一步地說，由於擴散板130上每一網點區塊P1的 中心位置C2會相對地較靠近發光元件112，網點區塊ρι 的中心位置C2的光束L1之光強度較高，因此可藉由將網 點140之排列方式設置為隨遠離相對應的發光元件112的 中心位置C1(或遠離網點區塊P1的中位置c 之排列方式，如圖2A所示，從而可在J前述 下可避免產生光均勻度不佳的情況。在本實施例中，上述 11 201219919 PT1975 35552twf.d〇c/n 的網點140的材質與擴散板13〇的材質不同，其中網點14〇 可採用印刷的方式形成於擴散板13〇上’因此網點14〇的 材質可以為油墨之類的材質，且擴散板13〇的内部通常會 摻有擴散粒子(未繪示）’用以擴散通過其中的光線。 在背光模組100中，上述的網點14〇的尺寸大小皆為 相同，網點140擴散光束L1以使背光模組1〇〇可提供光 均勻度較佳的方式是利用網點14〇的分佈密度來達成。然 而，於另一實施例中，亦可採用網點隨著不同位置而具有 不同的尺寸大小以使背光模組2〇〇在縮短間距Η的條件下 仍可提供較佳的光均勻度，如圖4所示。 請同時參考圖2Α與圖4，背光模組200與背光模組 100結構相似，惟二者不同處在於，位於網點區塊ρι内的 這些網點140的尺寸隨著遠離網點區塊ρι的中心位置由 大到小排列，如此亦可達到使上述面積比隨著遠離中心位 置而遞減的效果，如圖4所示。詳細而言，由於每一網點 區塊P1的中心位置C2對應於發光元件112的中心位置 C1 ’且擴散板130上母一網點區塊pi的中心位置匸2會相 對地較靠近發光元件112，網點區塊！^的中心位置C2的 光束L1之光強度較高，因此可藉由將尺寸較大的網點14〇 設置於網點區塊P1的中心位置C2上，並將尺寸較小的網 點140設置於运離網點區塊ρ〗的中心位置C2上，並透過 網點140會將光束L1部分反射之原理，藉以可使背光模 組200在間距Η縮減時仍可提供較佳的光均勻度。 此外，網點區塊Ρ1中的網點14〇的分佈外形，例如 201219919 PT1975 35552twf.doc/n 可以是以同心圓、矩形、星芒形等幾何圖形或以亂數的方 式排列（未繪示）’網點區塊P1中的網點14〇的分佈外形大 致付合上述網點140的分佈密度不同或網點140隨著不同 位置而具有不同的尺寸大小的分佈情況。再者，在其他實 施例中，反射錐170亦可以是圓錐、橢圓錐或其他形狀的 錐體。另外，反射錐170可以是空心錐體或實心錐體。 在背光模組100與背光模組200中，上述網點14〇的 尺寸實質上可落在大於等於0.2mm與小於等於〇 8mm之 間。另外，上述的背光模組1〇〇、200更可分別包括一背板 150 ’其中上述的發光元件112設置於背板15〇上，如圖 2 A與圖4所示。 另外’由於網點140會反射部份的光束L1，因此為了 提尚背光模組100、200的光利用率以使背光模組1〇〇、200 可提供較佳的背光光強度，因此上述的背光模組1〇〇、2〇〇 更可分別包括有反射單元160，其中反射單元160配置於 背板150上並位於發光元件112的周邊，如圖2A與圖4 所示。在本實施例中，反射單元160例如為一反射片或一 反射膜’且反射錐170配置於反射單元160上。 圖5為本發明又一實施例之背光模組的局部剖面示意 圖。請參照圖5，本實施例之背光模組200,與圖4之背光 模組200類似，兩者的差異如下所述。在本實施例中，反 射錐170配置於背板15〇上。舉例而言，反射錐17〇直接 設置於背板150上，且背板150本身可具有反光的功能。 此外’在本實施例中，擴散板130與背板150的間距為H，， 13 201219919 PT1975 35552twf.doc/n 且背光模組滿足0.1 SH，/Lg〇.45。 綜上所述，本發明之實施例的背光模組至少具有下列 其中-個優點··由於本發明之實施例之背光模組採用擴散 圖案搭配反射錐的設計，因此發光元件所發出的部分光束 適於被擴散圖案與反射錐反射，並且傳遞至擴散板之對應 於相鄰發光元件之_區域。如此„_來，可使發光元件的 =上方之亮度不會過高，進而提升背光模組所提供 源之均勻度。 ^ 以以上所述者，僅為本發明之健實施_已，當不能 發申請專利範圍及 利涵蓋之範圍内。另飾’皆仍屬本發明專 圍不須請專利範 輔助專利文一並 【圖式簡單說明】 ，的 面示意圖。之線所1 會示之背光模組的局部剖 視示為圖2a中的發光元件、反射錐及發散透鏡的上 圖3為圖2A之局部放大圖 為本I月另一實施例之背光模組的局部剖面示意 201219919 PT1975 35552twf.doc/n 圖 圖 圖5為本發明又一實施例之背光模組 的局部剖面 示意 【主要元件符號說明】 100、200、200’ ：背光模組 112、112a、112b、112c、112d :發光元件 122、122a、122b、122c、122d :發散透鏡 130 =擴散板 132 :表面 140 :網點 150 :背板 160 :反射單元 170 :反射錐 172、172a、172b、172c、172d :錐面 174 :稜線 174’ ：延伸線201219919 PT1975 35552twf.doc/n VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a light source' and particularly relates to a backlight module. [Prior Art] A direct-lit backlight module using a light-emitting diode (LED) as a light source is used, and the efficiency of the LED is improved with the advancement of technology, so that a small number of LEDs can be used. The optical brightness requirements of the direct-lit backlight module. However, due to the reduction in the number of LEDs used, and the direct-type limitation that the thickness of the optical module is not too thick, the problem of uneven brightness of the direct-lit backlight module is derived. Generally speaking, in order to solve the problem of uneven brightness on the surface of the direct-type backlight module, the divergence Wei can be set on the LED, so that the thickness of the direct-type backlight mode can be reduced, and the noise is uniform. However, the collision of the direct-type backlight module is still different from that of the LED backlight. The thickness of the direct-lit backlight module is about the side-by-side LED backlight mode. Therefore, it is a focus of attention to how to effectively reduce the direct-type (four) backlight module, the dryness to achieve the purpose of thinness, and enhance the competitiveness of the light-emitting backlight module. 0. The Republic of China Patent Publication No. 200916845 discloses a reflective coffin suitable for a straight lower jaw and a second module having a convex portion as a reflecting surface. _Huaguoguo Group: i] 2:2:976 reveals that the liquid crystal display device includes a backlight module, the light-emitting component includes a plurality of light-emitting diodes with a receiving space, and has money. The number of rules is 201219919 PT1975 35552twf.doc/n The reflection sheet of the through hole. The Republic of China Patent No. M371308 discloses that a secondary lens is disposed on the light emitting diode in the light emitting diode module. No. M332861 discloses a backlight module comprising a light box, a plurality of light sources and a plurality of reflectors. A polycrystalline light emitting diode package structure is disclosed in the Republic of China Patent Publication No. 200919779, wherein between the light emitting diode wafers There is a pyramidal structure. The Republic of China Patent No. M302040 discloses a backlight module including a light box, a light source, a diffusion plate and a support member. The Republic of China Patent No. M362428 discloses a backlight module including a back plate structure and a plurality of light sources. , a circuit board and at least one optical film. The Republic of China Patent No. 1265749 discloses a backlight device comprising a casing, a plurality of light emitting diodes, at least one electric The invention provides a backlight module, which can provide a uniform surface light source and can have a thin thickness. Other objects and advantages of the invention can be further understood from the technical features disclosed in the present invention. The above-mentioned or some or all of the objectives or other purposes, the present illuminating element: a backlight module The group includes a backing plate, a plurality of hairpins, a reflection cone, a diffusion plate and a plurality of diffusion patterns, which are respectively disposed on the back plate and are respectively adapted to provide a plurality of light beams. ^ A 曰] diffusion of some TbTG parts and reflection cones above the towel, these light-emitting elements 201219919 FI-iy75 35552twf.doc / n and the reflection cone are arranged between the back plate and the diffusion plate. These diffusion patterns are set on the diffusion plate The surface facing the back plate, wherein the diffusion pattern is directly above the light-emitting elements (4), and the area ratio of the unit area of the diffusing plate is larger than the surface area of the diffusing plate directly above the reflecting cone in FIG. In summary, the backlight module of the embodiment of the present invention has at least the following advantages: since the backlight module of the embodiment of the present invention adopts a diffusion pattern and a reflective design, the light-emitting element emits & The partial beam is adapted to be sequentially reflected by the expansion and transmitted to the region of the diffusing plate corresponding to the phase (four) optical element, so that the brightness* directly above the light emitting element may be too high. Further, the uniformity of the surface light source provided by the backing wire group is improved. In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments will be described in detail below with reference to the accompanying drawings. The above and other technical contents, features and effects of the present invention will be apparent from the following description of the preferred embodiments. The directional terms mentioned in the following embodiments, for example, upper, two left, right, front or back, etc., refer to the direction of the additional schema. Therefore, the directional term used is to limit the invention by the county. 1 is a partial top view of a backlight module according to the embodiment of the present invention, and FIG. 2B is a partial cross-sectional view of the backlight module taken along line t AA′ of FIG. 1 , and FIG. 2B is a light-emitting component and a reflective view of FIG. 2A . Schematic 'While for convenience of explanation, the upper cymbal 1 of the mirror of the H mirror can only depict the diffuser plate and the distribution of the dots on which the 201219919 PT1975 35552 twf.doc/n is placed, in which other possible layers and structures are omitted. Referring to FIG. 1 , FIG. 2A and FIG. 2B , the backlight module 1 of the embodiment includes a plurality of light-emitting elements 112 (for example, the light-emitting elements 112 a , 112 b , 112 c , and 112 d illustrated in FIG . 2 ) , and a plurality of diverges. The lens 122 (for example, the diverging lenses 122a, 122b, 122c, and 122d shown in FIG. 2B), the diffusion plate 130, and the at least one reflection cone 17A (in the embodiment, a plurality of reflection cones 170 are taken as an example) and a Back plate 150. The light-emitting elements 112 are disposed on the backplane 150 and are respectively adapted to provide a plurality of light beams L1, and any two adjacent light-emitting elements 112 (eg, light-emitting elements 112a and 112b' or, for example, light-emitting elements 112b and 112d' or, for example, light-emitting elements ii2c It is L from the center position C1 of ii2d, or for example, the light-emitting elements 112a and 112c). In the present embodiment, the distance of 'L is, for example, 50 mm (millimeter, mm), but the present invention is not limited thereto, and the distance of L can be adjusted according to the needs of the user. In the present embodiment, the light-emitting element 112 is exemplified by a light-emitting diode element. In addition, FIG. 1 illustrates a partial top view of the backlight module 100, and the number of light-emitting elements in FIG. 1 is more than two, and FIG. 1 is merely illustrative of the number of light-emitting elements not used to limit the present invention. . In other words, in one embodiment, the number of light-emitting elements may be only two. In the present embodiment, the number of the light-emitting elements 112 exceeds four, and the number of the reflection cones 170 is two or more, and these reflection cones are interposed between the light-emitting elements 112. Further, the reflection cone 170 is disposed on the back plate 15A and interposed between the light-emitting elements 112. Further, the diverging lenses 122 are respectively disposed above the light-emitting elements 112 as shown in Fig. 2A. In the present embodiment, the diverging lens 122 can further extend the light beam L1 provided by the light-emitting element 112 by 7 201219919 ΡΪ 1975 35552 twf.d〇c/n mr: after the light beam u passes through the diverging lens 122, the divergence of the light beam L1 The angle can be large (that is, the first beam L1 is irradiated on the diffuser plate to become large), that is, the incident angle of the beam U is variable ▲ 士a不不' where FIG. 3 is a partial enlarged view of FIG. 2A. For example, the diverging lens 122 made by the example can make the per-light-emitting element, the light beam L1 pass through the corresponding diverging lens 122, and the angle of incidence of the η person to the diffusing plate m can be substantially In the college G degree and less than or equal to 8G degrees. In the present embodiment, the above incident angle 0 is defined as the angle between the beam L1 and the normal of the diffusing plate, as shown in Fig. 3. Please refer to FIG. 2A and FIG. 2B. The diffusion plate 13 is disposed above the light-emitting element 112 and the reflection cone 17〇. The light-emitting element 112 and the reflection cone 170 are placed on the back plate 15 and the diffusion plate 13〇. between. In the present embodiment, the diffusion plate 130 is disposed above the diverging lens 122. In addition, in the embodiment, the backlight module 100 includes a plurality of diffusion patterns (for example, a plurality of dots 140) disposed on a surface 132 of the diffusion plate 13 facing the back plate 15 , wherein the diffusion patterns (eg, dots) 140) corresponds to the light-emitting element 112. In the present embodiment, the reflection cone 17 is, for example, a polygonal pyramid. In FIG. 2B, the reflection cone 170 is taken as a quadrangular pyramid, and a reflection cone is interposed between four adjacent light-emitting elements 112. In this embodiment, the light-emitting elements 112 adjacent to the reflection cone 170 fall. The ridgeline 174 of the reflective cone 17 于 is on the extension line 174 of the orthographic projection on the backing plate 150, but the invention is not limited thereto. In this embodiment, the light beam U emitted by the light-emitting element 112 has a diffusion pattern (for example, a dot and a diffusion plate 130) that is partially transmitted through the light-emitting element 112 in 201219919 PT1975 35552 twf.doc/n - and transmitted to the backlight module 1 However, there is also another portion of the beam U that is reflected by the diffusion pattern above the light-emitting element 112 to the reflection cone 170, which is adapted to reflect this portion of the beam u to the diffuser plate 130 corresponding to the adjacent light-emitting element. The area between the 112 and the light beam L1 passes through the area and is transmitted to the outside of the backlight module 1. Thus, the light beam directly above the light-emitting element 112 is not excessively strong, so that the backlight module 1 can be used. A uniform surface light source is provided. Further, in the embodiment, the light beam L1 emitted by the light-emitting element! 12 may also be directly incident on the reflection cone 170 after passing through the diverging lens 122, and reflected by the reflection cone m to the diffusion plate 13 〇 corresponds to the area between adjacent light-emitting elements 112, thereby improving the uniformity of the surface light source provided by the backlight module 100. In this embodiment, the reflective cone 17〇 has a tapered surface 172 (for example, tapered surfaces 172a, 172b) , 172c, 172 d), the tapered surface 172 is adapted to reflect the light beam LI. In addition, the backlight module 100 further includes a reflective unit 16 〇, wherein the reflective unit 160 is disposed on the back plate 15 , and is located around the illuminating element 112 瘫As shown in Fig. 2A, in the embodiment, the reflection unit is, for example, a reflection sheet or a reflection film, and the reflection cone 17 is disposed on the reflection unit I60. In the embodiment, the diffusion plate 130 and the reflection unit A spacing of 160 is Η, and the backlight module 100 satisfies 〇.i'H/Lg 〇.45. In terms of the fineness, the spacing of the diffusing plate 130 relative to the reflecting unit 160 can be defined as the transmission of the light beam L1 to the diffusion. The distance of the light mixing of the plate 13 。. From the optical point of view, if the spacing Η is larger, the light beam L1 will have better light uniformity after passing through the diffusion plate 130, however, if the spacing is too large, 201219919 PT1975 35552twf. Doc/n will cause the overall thickness of the backlight module 100 to be effectively reduced and the overall light output brightness to be relatively weakened; if the pitch is too small, the light uniformity of the surface light source provided by the backlight module 100 will not be Good. Therefore, in order to effectively reduce The overall thickness of the backlight module 100 and at the same time provide better light uniformity. The backlight module 100 of the present embodiment uses the above-described diffusion pattern and the design of the reflective cone 170 to achieve a uniform surface light source at a small pitch. In addition, the backlight module 1 of the present embodiment uses the diverging lens 122 to increase the incident angle 0 of the light beam L1 provided by the light-emitting element 112 after passing through the diverging lens 122, thereby further reducing the diffusion plate 13 〇 relative The pitch 反射 of the reflecting unit 160, that is, the above-mentioned light mixing distance. In other words, the above design enables the backlight module 1 to satisfy the condition of 0. GH / L S 0.45, thereby making the backlight module 1 轻 thin and light. It is worth mentioning that, since the embodiment uses the diverging lens 122 to increase the incident angle 0 of the light beam L1 when it is transmitted to the diffusion plate 130, the distance L between any two adjacent light-emitting elements 112 can be relatively large, in other words, The backlight module 100 can use a smaller number of light-emitting elements 112 while providing the same backlight area and still exhibit better light uniformity. It should be noted that the backlight module 100 reduces the diffusion plate 130 relative to the reflective unit 160 by using a plurality of dots 140 on the diffusion plate 13 在 in the case where a small number of light-emitting elements 112 are used. The pitch is Η, so that the brightness of the light emitted from the light beam L1 to the diffusing plate 130 can be maintained. In other words, the backlight module 100 of the present embodiment can provide appropriate brightness and uniformity of light while reducing the overall thickness and using a small number of the light-emitting elements 112. 201219919 PT1975 35552twf.doc/n The distribution and effect of the diffusion pattern (e.g., dot 140) on the diffuser plate 30 will be further exemplified below. In FIGS. 1 and 2A, the diffusion pattern (for example, the dot 14 〇) occupies an area ratio of a unit area of the diffusion plate 13 正 directly above the illuminating elements 112 to be larger than a diffusion pattern (for example, a dot 14 〇) at the reflection cone 17 〇 The area ratio of the unit area of the diffusion plate 130 is directly above. For example, the dots 14 on the diffusion plate 130 are arranged in a densely spaced manner away from the corresponding light-emitting elements ι2, so that the above-mentioned area ratio is decreased as being away from the central position C1, such as Figure 2A shows. In detail, the diffusion plate 130 can be divided into at least two dot blocks P1 according to the needs of the user, wherein each dot block P1 corresponds to the position of each light emitting element 112, and each dot block P1 is configured. There are a plurality of network points 140, as shown in Figure 2. The arrangement of the dots 14() in each of the dot blocks P1 may be arranged in an arrangement as shown in FIG. 2A, that is, the center position C2 of each dot block P1 may correspond to each The center point c of a light-emitting element 112 and the dots located on the halftone dot block P1 are arranged in a densely spaced manner from the center position C2 far from the halftone dot block P1. Further, since the center position C2 of each of the halftone dot blocks P1 on the diffuser plate 130 is relatively closer to the light emitting element 112, the light intensity of the light beam L1 at the center position C2 of the halftone dot block ρι is higher, so The arrangement of the dots 140 is set to be arranged away from the central position C1 of the corresponding light-emitting element 112 (or away from the middle position c of the halftone block P1, as shown in FIG. 2A, so that light can be avoided under the foregoing J. In the present embodiment, the material of the dot 140 of the above-mentioned 11 201219919 PT1975 35552twf.d〇c/n is different from the material of the diffusion plate 13〇, wherein the dot 14〇 can be formed by diffusion in a printing manner. The plate 13 is on the top surface. Therefore, the material of the dot 14〇 may be a material such as ink, and the inside of the diffusion plate 13〇 is usually doped with diffusing particles (not shown) to diffuse light passing therethrough. In 100, the size of the above-mentioned dots 14〇 is the same, and the way in which the dot 140 diffuses the light beam L1 so that the backlight module 1 can provide light uniformity is achieved by using the distribution density of the dots 14〇. In another embodiment, the mesh dots may have different sizes along different positions to enable the backlight module 2 to provide better light uniformity under the condition of shortening the pitch, as shown in FIG. 4 . Referring to FIG. 2A and FIG. 4 simultaneously, the backlight module 200 and the backlight module 100 are similar in structure, except that the size of the dots 140 located in the dot block ρι is away from the dot block. The central position of the center is arranged from large to small, so that the effect of decreasing the above area ratio as it moves away from the center position can be achieved, as shown in Fig. 4. In detail, since the center position C2 of each dot block P1 corresponds to The center position C1' of the light-emitting element 112 and the center position 匸2 of the parent-site dot pi on the diffusion plate 130 are relatively closer to the light-emitting element 112, and the light intensity of the light beam L1 at the center position C2 of the half-point block is higher. Therefore, the larger size dot 14 〇 can be placed on the center position C2 of the halftone dot block P1, and the smaller size dot 140 can be placed on the center position C2 of the transported dot block ρ 〗 Dot 140 will light The principle of partial reflection of the beam L1, so that the backlight module 200 can still provide better light uniformity when the pitch is reduced. In addition, the distribution shape of the dot 14〇 in the dot block Ρ1, for example, 201219919 PT1975 35552twf.doc /n may be arranged in a geometric pattern such as a concentric circle, a rectangle, a star shape or a random number (not shown). The distribution shape of the dot 14〇 in the dot block P1 substantially satisfies the distribution density of the above-mentioned dots 140. The different or dots 140 have different sizes of distribution with different locations. Further, in other embodiments, the reflective cone 170 can also be a cone, an elliptical cone, or other shaped cone. Additionally, the reflective cone 170 can be a hollow cone or a solid cone. In the backlight module 100 and the backlight module 200, the size of the dot 14 实质上 may substantially fall between 0.2 mm and 〇 8 mm or less. In addition, the backlight modules 1 and 200 may further include a back plate 150 ′, wherein the above-mentioned light-emitting elements 112 are disposed on the back plate 15 , as shown in FIG. 2A and FIG. 4 . In addition, since the dot 140 reflects a part of the light beam L1, in order to improve the light utilization efficiency of the backlight modules 100 and 200, the backlight modules 1 and 200 can provide better backlight light intensity, so the above backlight The modules 1 and 2 may further include a reflecting unit 160, wherein the reflecting unit 160 is disposed on the back plate 150 and located at the periphery of the light emitting element 112, as shown in FIGS. 2A and 4. In the present embodiment, the reflection unit 160 is, for example, a reflection sheet or a reflection film ', and the reflection cone 170 is disposed on the reflection unit 160. FIG. 5 is a partial cross-sectional view of a backlight module according to still another embodiment of the present invention. Referring to FIG. 5, the backlight module 200 of the present embodiment is similar to the backlight module 200 of FIG. 4, and the difference between the two is as follows. In the present embodiment, the reflecting cone 170 is disposed on the back plate 15A. For example, the reflective cone 17 is disposed directly on the backing plate 150, and the backing plate 150 itself can have a reflective function. Further, in the present embodiment, the distance between the diffusion plate 130 and the back plate 150 is H, 13 201219919 PT1975 35552twf.doc/n and the backlight module satisfies 0.1 SH, /Lg 〇.45. In summary, the backlight module of the embodiment of the present invention has at least one of the following advantages: Since the backlight module of the embodiment of the present invention adopts a diffusion pattern and a reflection cone design, a part of the light beam emitted by the light-emitting element It is adapted to be reflected by the diffusion pattern and the reflection cone, and is transmitted to the region of the diffusion plate corresponding to the adjacent light-emitting element. Thus, the brightness of the upper side of the light-emitting element is not too high, thereby improving the uniformity of the source provided by the backlight module. ^ As described above, only the implementation of the present invention is _ already, when not Within the scope of the scope of application for patent application and the scope of coverage, the decoration is still a part of the invention, and the backlight of the patent is not required. A partial cross-sectional view of the module is shown in FIG. 2a as a light-emitting element, a reflective cone, and a diverging lens. FIG. 3 is a partial enlarged view of FIG. 2A. FIG. 2 is a partial cross-sectional view of a backlight module according to another embodiment of the present month. 201219919 PT1975 35552twf .doc/n FIG. 5 is a partial cross-sectional view of a backlight module according to another embodiment of the present invention. [Main component symbol description] 100, 200, 200': backlight modules 112, 112a, 112b, 112c, 112d: illumination Element 122, 122a, 122b, 122c, 122d: diverging lens 130 = diffusing plate 132: surface 140: halftone dot 150: backing plate 160: reflecting unit 170: reflecting cone 172, 172a, 172b, 172c, 172d: tapered surface 174: ridgeline 174': extension line
Cl、C2 :中心位置 Η、H’ ：間距 L :距離 L1 :光束 Ν1 :法線 Ρ1 :網點區塊 Θ :入射角度 15Cl, C2: Center position Η, H': Spacing distance L: Distance L1: Beam Ν1: Normal Ρ1: Dot block Θ: Incidence angle 15