201007286 九、發明說明： 【發明所屬之技術領域】 且特別是有關於一種背 本發明是有關於一種顯示器 光模組。 【先前技術】 背光模組為液晶顯示面板的關鍵零組件之一。由於液 曰本身並不會發光’因此需藉助背光模組來供應光源，藉201007286 IX. INSTRUCTIONS: [Technical field to which the invention pertains] and particularly related to a back invention The present invention relates to a display optical module. [Prior Art] The backlight module is one of the key components of the liquid crystal display panel. Since the liquid raft itself does not emit light, it is necessary to use a backlight module to supply the light source.
以使液晶面板能夠提供正f且亮度勻稱之影像4背光模 財有多個光學片，例如導歧、擴散片與稜鏡片，用來 使光源發出的光均勻地分佈於液晶面板上，進而提高液晶 面板之亮度。 應用於背光模組的光源有冷陰極螢光燈或發光二極 體。其中’由於發光二極體具備了高耐久性、壽命長、輕 5耗電里低等特性，是一極為理想的新世代照明光源。 尤其在目前能源費用逐漸高㈣狀況下，發光二極體更為 受到產業界的重視及㈣，藉峰代以往耗電量較大的其 他發光元件。此外，發光二極體種類繁多、用途廣泛，早 已成為現代生活中不可或缺的重要工具。 般而S，文限於製程技術，同一批發光二極體中的 每一個發光二極體所發出的光的色溫和亮度不盡相同。當 應用於顯示器的背光模组t時，各個發光二極體的色溫或 凴度的差異將會造成顯示器畫面上亮暗區塊或顏色不均勻 等問題。 201007286 為了避免上述的問題，顯示器業者通常會將同一批發 光二極體依其色溫和亮度再細分分類，僅取色溫和亮度相 近的發光二極體來製作背錢組，其餘的發光二極體則淘 汰。如此不僅增加製程匈，還浪費材料，增加生產成本。 有鑑於此，需要-種新的背光模組及其光學結構，能 夠克服發光二極體色溫和亮度差異的現象，同時兼顧產業 需求及經濟效益。In order to enable the liquid crystal panel to provide a positive image with a uniform brightness and brightness, there are a plurality of optical sheets, such as a guide, a diffusion sheet and a cymbal sheet, for uniformly distributing the light emitted by the light source on the liquid crystal panel, thereby improving The brightness of the LCD panel. The light source applied to the backlight module is a cold cathode fluorescent lamp or a light emitting diode. Among them, the light-emitting diode is an ideal new-generation lighting source because of its high durability, long life, low power consumption and low power consumption. Especially in the current situation of high energy costs (IV), the light-emitting diodes have received more attention from the industry and (4), relying on other light-emitting components that used to consume more power. In addition, the variety and wide range of light-emitting diodes have long been an indispensable tool in modern life. As a general rule, the text is limited to the process technology, and the color temperature and brightness of the light emitted by each of the light-emitting diodes in the same wholesale photodiode are not the same. When applied to the backlight module t of the display, the difference in color temperature or temperature of each of the light-emitting diodes causes problems such as bright and dark blocks or uneven colors on the display screen. 201007286 In order to avoid the above problems, the display industry usually subdivides the same wholesale photodiode according to its color temperature and brightness, and only adopts the light-emitting diode with similar color temperature and brightness to make the money group, and the remaining light-emitting diodes. Eliminated. This not only increases the process of Hungary, but also wastes materials and increases production costs. In view of this, a new backlight module and its optical structure are needed, which can overcome the difference in color temperature and brightness of the LED, while taking into account industrial needs and economic benefits.
【發明内容】[Summary of the Invention]
本發明-方面提供-種混光結#，用卩混合數個光源 所發出的光，以解決因各個光源出光的差異所造成之色溫 和亮度不均勻的問題。混光結構基本上為一個導光條，其 具有一對互相相對的平面，稱為第一面和第二面。第一^ 上間隔叹置有數個入光面，入光面分別鄰接光源，例如發 光二極體’以傳入光。帛二面上設置有出光面，出光面鄰 接導光板《數個斜面設置於導光條上鄰接出光面且對齊入 光面之處。每一斜面均不平行於入光面，且斜面的内壁用 以反射自入光面入射之光源的光。導光條尚包含反射/穿透 微結構，其設置於第一面上，且在兩緊鄰的入光面之間， 並且對齊出光面，以將自斜面反射之光反射至出光面。 由此可知，即便各個光源所發出的光的色溫或亮度略 有差異’也可透過混光結構將各個光源的光相互混合，使 得最終由出光面傳出的光為色溫和亮度混合均勻的光。 另一方面’本發明提供一種背光模組，可採用數個亮 6 201007286 度和色溫不全然相同的规，透過f光模址中的混光梦構 將光源所發出的光均勾混合，以產生均句色溫和亮度㈣ 出光。背光模組具有光源、混光結構和導光板，混光 介於光源和導光板之間。 ' 《光結構包含—個導光條，導光條上設置有數個人光 面、斜面、反射/穿透微結構和出光面。入光面間隔排列於 導光條之第-面上，每-光源鄰接一入光面以入射光至混 ❹ 力結構。斜面之内壁分別對齊人光面以反射自人光面入射 之光。反射/穿透微結構設置於兩緊鄰的入光面之間，用以 反射自斜面反射之光。出光面設置於導光條之第二面上， 鄰接斜面且對齊反射/穿透微結構，出光面鄰接導光板，用 以將自反射/穿透微結構反射之光傳送到導光板。其中，第 面與第一面為導光條上一對相對之平面。 藉由混光結構中人光面、斜面、出光面和反射/穿透微 結構等設置，使各光源所發出之光得以在混光結構中均勻 © 混合，進而使得傳送到導光板的光為亮度和色溫均勻的光。 本發明提供另一種混光結構，用以混合多個光源所產 生之不同色溫或亮度的光，以產生均勻的輸出光。混光結 構主要包含一個導光條，其剖面大致呈梯形，其具有第一 •面、第二面和一對斜面。其中，第二面與第一面為一對相 對之平面，且每一斜面均鄰接第一面和第二面。第一面上 分隔設置有數個入光面，每一入光面分別對齊斜面並分別 鄰接數個光源。第一面上還設置有至少一反射/穿透微結 構’反射/穿透微結構與入光面交替排列，可用以反射/穿透 而The present invention provides a light-mixing junction # for mixing light emitted by a plurality of light sources to solve the problem of uneven color temperature and brightness caused by the difference in light output from the respective light sources. The light mixing structure is basically a light guiding strip having a pair of mutually opposing planes, referred to as a first side and a second side. The first ^ is spaced apart by a plurality of light incident surfaces, and the light incident surfaces are respectively adjacent to the light source, such as the light emitting diode, to transmit light. A light-emitting surface is disposed on the second surface of the crucible, and the light-emitting surface is adjacent to the light guide plate. "Several slopes are disposed on the light-guiding strip adjacent to the light-emitting surface and aligned with the light surface. Each of the slopes is not parallel to the light incident surface, and the inner wall of the slope is used to reflect light from a light source incident on the light incident surface. The light guiding strip further comprises a reflection/penetration microstructure disposed on the first surface and between the two adjacent light incident surfaces, and aligned with the light surface to reflect the light reflected from the inclined surface to the light exit surface. It can be seen that even if the color temperature or brightness of the light emitted by each light source is slightly different, the light of each light source can be mixed with each other through the light mixing structure, so that the light finally transmitted from the light emitting surface is light with uniform color temperature and brightness. . On the other hand, the present invention provides a backlight module which can adopt a plurality of bright 6 201007286 degrees and a color temperature which is not completely the same, and combines the light emitted by the light source through the mixed light dream structure in the f optical mode address to Produce uniform color temperature and brightness (4) Light output. The backlight module has a light source, a light mixing structure and a light guide plate, and the light mixing is between the light source and the light guide plate. The light structure consists of a light guide strip with several personal light surfaces, bevels, reflection/penetration microstructures and light exit surfaces. The light incident surfaces are arranged on the first surface of the light guiding strip at intervals, and each light source is adjacent to a light incident surface to incident light to the mixed force structure. The inner walls of the bevel are respectively aligned with the human face to reflect light incident from the human face. The reflection/penetration microstructure is disposed between two adjacent light incident surfaces for reflecting light reflected from the slope. The light-emitting surface is disposed on the second surface of the light-guiding strip, adjoins the slope and is aligned with the reflective/penetrating microstructure, and the light-emitting surface is adjacent to the light guide plate for transmitting the light reflected from the reflective/penetrating microstructure to the light guide plate. The first surface and the first surface are a pair of opposite planes on the light guiding strip. By the arrangement of the human light surface, the slope surface, the light exit surface and the reflection/penetration microstructure in the light mixing structure, the light emitted by each light source can be uniformly mixed in the light mixing structure, so that the light transmitted to the light guide plate is Light with uniform brightness and color temperature. The present invention provides another light mixing structure for mixing light of different color temperatures or brightnesses produced by a plurality of light sources to produce uniform output light. The light mixing structure mainly comprises a light guiding strip having a substantially trapezoidal cross section and having a first surface, a second surface and a pair of inclined surfaces. The second surface and the first surface are a pair of opposite planes, and each of the slopes is adjacent to the first surface and the second surface. The first surface is separated by a plurality of light-incident surfaces, and each of the light-incident surfaces is respectively aligned with the inclined surface and adjacent to the plurality of light sources. The first surface is further provided with at least one reflective/transmissive microstructure. The reflective/penetrating microstructure is alternately arranged with the incident surface for reflection/penetration.
201007286201007286
Him光即—㈣從斜面反㈣域會穿透反 f穿透微4 ’另—部分光線則會被反射。第二面上役置 二:出光面’出光面對齊反射/穿透微結構，用以將自 反射/穿透微結構反射之光傳至導光板。由上述可知，混光 結構可混合多個光源所發出之光，並使光均句混合，進 產生亮度和色溫均勻的光。 另外，本發明又提供另-種混光結構，透過混合光線 的方式，解決光源的光色溫或亮度不均勻之問題。混光結 構中有-導光條，導光條具有互相相對且大致平行的第一 面和第一面。其中’數個入光面彼此分隔設置於第一面上， 且分別鄰接數個光源，以接受光源入射之光。數個凹槽彼 此分隔設置於第二面上，且分別對齊入光面。每一個凹槽 之内壁會反射自人光面人射之光社光。數個反射/穿透微 結構分隔設置於第一面上，且與入光面交替排列，用以反 射自凹槽反射之光。數個出光面分隔設置於第二面上，且 與凹槽交替排列並對齊反射/穿透微結構，用以將自反射/ 穿透微結構反射之光傳出至一導光板。 由上述可知，雖然各個光源所產生的光的色溫或亮度 不相同，然而透過混光結構將光相互混合，從而產生色溫 和亮度混合均勻的光《如此一來，業者不必再執著於挑選 相同或相近色溫及亮度的光源，不僅簡化製作流程，更可 減少材料支出，降低生產成本。 【實施方式】 201007286 請參考第1圖和第2圖，其分別繪示本發明一實施例 之背光模組100的立體圖和俯瞰圖。背光模組1〇〇負責提 供給顯示器不論是亮度或是色溫皆為均勻的光。 背光模組100具有光源11 〇、導光板丨20、反光板13〇 • 和混光結構140 ’其中混光結構140介於光源11 〇和導光板 120之間，而反光板130貼合部分導光板12〇的上表面，且 延伸到混光結構140和導光板12〇的下表面。 ® 請同時參考第2圖和第3圖，第3圖繪示混光結構140 的俯瞰圖。混光結構H〇主要包含一個導光條146，用來將 光源110所發出的光傳導到導光板120。導光條ι46可由壓 克力或聚f基丙烯酸甲酯等透明的光學材質所組成。導光 條146上設置有數個入光面21〇、斜面240、反射/穿透微 結構250和出光面220。 入光面210間隔排列於導光條146之第一面ι42上， 且鄰接光源110,以傳入光源110的光。光源11〇可抵接入 © 光面210上，即光源110入光面210彼此黏合。如此一來， 由入光面210入射的光的入射角度可達±9〇度。在本發明之 實施例中，光源11〇緊鄰入光面21〇，且光源11〇和入光面 210之間有空隙’使得光源110所發出的光先傳到空氣中， 再由空氣傳到入光面21〇而進入導光條14〇。如此的傳導路 控’可使得最終由入光面210入射的光的入射角度縮小到 臨界角之内（ΡΜΜΑ約±42度），有利於後續之全反射的作 用。 斜面240設置於導光條146中，鄰接出光面220且對 201007286 齊入光面210之處。每一斜面240與各個入光面210均不 平行，使得自入光面210入射的光不易從斜面240射出， 且斜面240之内壁用以反射自入光面210入射之光，以增 加光的反射次數及行徑路徑，使得各個光源110傳入的光 得以在混光結構140中充分混合。 一般來說，當光穿過兩種折射率不同介質的介面時， 光的行進方向會有所改變’如折射或反射。其中，光由光 ❹ 松介質入射到光疏介質時’如果光的入射的角度大於臨界 角’將會發生全反射。在本技術領域中具有通常知識者應 知臨界角之原理’及臨界角之大小會因應介面兩端之介質 之不同而有所不同。在本發明之實施例中，導光條丨的 材質為壓克力，其與空氣之間的臨界角約為42度。 本發明之實施例便是利用上述臨界角的特性β具體而 言’斜面240與入光面210具有一夾角，使得光由入光面 210照射到斜面240時’大部分的光在斜面240上所產生的 | 入射角大於臨界角，故會產生全反射。 斜面240與入光面210之間的夾角也可調整，使得大 部分的入射光與斜面240的夾角大於光學材質的内全反射 的臨界角。斜面240與入光面210之間的夾角的角度介於 30度到60度之間，較佳為大於導光條146的臨界角。在本 實施例中，夾角的角度大於42度，較佳為45度。 另一方面，可在斜面240上進行加強全反射的結構， 使得入射光小於臨界角的入射光也可被斜面240所反射。 具體而言，斜面240的内壁的材質可為具有高反射係數的 201007286 錢膜，像是鏡面賴，㈣加斜面240的反射率。 在本實施例中，斜面240的一端鄰接出光面220，另— :與另-個斜面240鄰接，即斜面兩兩成對而構成數 :具有V形截面的凹槽230 ’凹槽230彼此分隔設置並與 出光面220交錯排列。每個凹槽23〇各自對齊一個入光面 210凹槽230的内壁亦為斜面24〇的内壁便可反射由入光 面210入射的光》 ❹ 具體而言’凹槽230的中央到第一 φ 142的最小距離 小於第一® 142和第二面144之間的距離，即凹槽230為 導光條146上的一個凹陷’而非突起。凹槽23〇中的斜面 240之間㈣角可依照導光條146的光學特性而變化。在本 實施例中，兩斜面240之間的夾角為9〇度。另外，凹槽23〇 也可包含多個斜面240,且凹槽23〇的形狀也可為半圓形。 反射/穿透微結構250設置於兩緊鄰的入光面21〇之 間’即反射/穿透微結構250與入光面21〇互相交錯排列於 導光條146的第一面142上，且對齊出光面22〇。反射/穿 透微結構250可將從斜面24〇反射的光線部分反射部分穿 透。其中，反射/穿透微結構250可反射部分自斜面24〇反 射之光，並將光反射到出光面22〇。另外，部分自斜面24〇 反射之光會穿透反射/穿透微結構25〇而傳出導光條146。 藉由設置於導光條146四週的反光板13〇可將傳出導光條 146的光反射回導光條146中。反射/穿透微結構25〇可為 印刷網點、V形凹槽（v-cut)或反光板。在本發明之實施 例申，反射/穿透微結構250為數個V形的凹槽252。 e 參 201007286 出光面220分隔設置於導光條146的第二面144上， 且鄰接導光板12G，用以將混合後的光傳導至導光板12〇。 在本發明之實施例中，出光面22〇上設置有數個v形的凹 槽222 ’使得光容易從出光面220傳出。 出光面220和入光面21〇分別設置於導光條146的不 同平面上，且彼此交錯而不對齊，使得由入光面22〇傳入 的光不易直接由出光® 220傳出。入光面21〇和出光面22〇 的面積可依照光源110和導光板120的大小設置，當光源 的厚度小於導光板120厚度時’入光面21〇的高度及其 面積則可小於出光面220的高度及其面積。反之亦然，當 光源uo的厚度大於導光板12〇的厚度時入光面的高度 和面積則可小於出光面的高度及面積。在本發明之實施例 中’導光條U6的剖面略成梯形，即導光條146的第一面 142與第—面144平行，且第—φ 142的高度大於第二面 的间度’使得入光面210的高度大於出光面22〇的高 度。在本發明之實施例中，入光面21〇的面積大於出光面 220的面積°另一方面’利用反光板130包覆導光條146 之外=面，可有效減少光線傳播過程中的漏光現象。 月參考第4 ® ’其繪示本發明另一實施例的一種混光 結構140的俯瞰圖。混光結#⑽的導光條146之中散佈 有許多散射粒子31〇。由於散射粒子31〇散佈於入光面 21〇、斜面240和出光面22〇之間，因此當光在導光條146 中行進而照射到散射粒子31q時，光會受到散射粒子31〇 作用而折射或反射，使得光的行進方向改變^如此一來， 12 201007286 在適當的散射粒子的濃度下，光在混光結構14〇中偏折的 次數可增乡，使得㈣行鄉彳㈣長，與其他錢ιι〇所 發出的光的混合程度便可提高。 ' 散射粒+ 310可由反射材料所t成，如二氧化鈦、硫 • 冑鋇、碳酸#5、氧傾、氧化鋅切化合物如二氧化石夕。 散射粒子310也可由折射率與導光條146不同的光學材料 所製成，像是聚苯乙烯或聚碳酸酯等。 © 由本發明之實施例可知，背光模組100中所採用的各 個光源110的亮度和色溫無須相同或近似，只要透過混光 結構140將各光源110所發出之光混合，便可使得傳送到 導光板120的光為亮度和色溫均勻的光。 請參考第5圖和第6圖，第5圖繪示依照本發明另一 實施例之背光模組100的俯瞰圖，而第6圖繪示混光結構 140的俯瞰圖。在本實施例中，混光結構14〇的導光條i46 具有大致成梯形的剖面，即第一面142和第二面144互相 φ 相對且平行，兩斜面240的兩端鄰接第一面142和第二面 144 〇 導光條146的第一面142上有兩個入光面21〇,個別鄰 择一光源110 ^其中，兩個光源U0的色溫和亮度可為不 同。在本發明之實施例中，兩光源11〇的色溫可為互補色。 當兩互補色的光混合後，可產生近似於白光的混合光。 兩緊鄰的入光面210之間設置有反射/穿透微結構 250。在本發明之實施例中，反射/穿透微結構25〇為數個v 形的凹槽252。出光面220設置於第二面144上，對齊反射 13 201007286 /穿透微結構250,且鄰接背光模組1〇〇的導光板12〇。 斜面240的一端鄰接出光面22〇，另一端鄰接入光面 210。混光結構140的兩斜面24〇個別垂直對齊兩入光面 210，且斜面240均不平行於入光面21〇。如前所述，斜面 240的内壁可將從入光面21〇入射的光反射，甚至為全反 射。 混光結構140中尚包含數個散射粒子31〇散佈於導光 〇 條146中’用以改變導光條146中光的行進方向。 換句話說，即便各個光源1 1 0所發出的光的色溫或亮 度略有差異，將光源110所發出的光從混光結構14〇的入 光面210傳入後’藉由斜面24〇、散射粒子31〇和反射/穿 透微結構250的作用，使得光在混光結構140中充分的混 合後’便可由出光面220傳送出色溫和亮度混合均勻的光。 如此一來，便可解決因各光源11〇出光差異所造成的不均 勻的問題。 參雖然本發明已以多個實施例揭露如上，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 和範圍内，當可作各種之更動與潤飾，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為準。 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例 能更明顯易懂，所附圖式之詳細說明如下： 201007286 第1圖係繪不依照本發明實施例的背光模組的立體圖。 第2圖係繪示依照第i圖所繪示之背光模組的俯瞰圖。 第3圖係繪示依照第2圖所繪示之混光結構的俯瞰圖。 第4圖係繪示依照本發明另一實施例之混光結構的俯 8¾.圖。 第5圖係繪示依照本發明另一實施例之背光模組的俯 瞰圖。 第6圖係繪示依照第5圖所繪示之混光結構的俯瞰圖。 元件符號說明 背光模組 110 :光源 導光板 130 :反光板 混光結構 142 :第一面 第二面 146 :導光條 入光面 220 :出光面 凹槽 230 :凹槽 钭面 250 :反射/穿透微結構 凹槽 310 :散射粒子 【主要 1〇〇 12〇 14〇 144 21〇 魯 222 240 252 15Him light—(4) from the opposite side of the slope (4) will penetrate the reverse f to penetrate the micro 4 ‘the other part of the light will be reflected. The second surface service 2: the light-emitting surface's light-emitting surface is aligned with the reflection/penetration microstructure for transmitting the light reflected from the reflective/penetrating microstructure to the light guide plate. As can be seen from the above, the light mixing structure can mix the light emitted by the plurality of light sources and mix the light evenly to generate light of uniform brightness and color temperature. In addition, the present invention further provides another type of light mixing structure, which solves the problem of uneven color temperature or brightness of the light source by mixing light. There is a light guiding strip in the light mixing structure, and the light guiding strip has a first surface and a first surface which are opposite to each other and substantially parallel. Wherein the plurality of light incident surfaces are disposed apart from each other on the first surface, and adjacent to the plurality of light sources respectively to receive the light incident from the light source. A plurality of grooves are disposed on the second surface and are respectively aligned with the light surface. The inner wall of each groove is reflected from the light of the human face. A plurality of reflection/penetration microstructures are disposed on the first surface and alternately arranged with the light incident surface to reflect the light reflected from the grooves. A plurality of illuminating surfaces are disposed on the second surface, and are alternately arranged with the grooves and aligned with the reflective/penetrating microstructures for transmitting the light reflected from the reflective/penetrating microstructures to a light guide plate. It can be seen from the above that although the color temperature or brightness of the light generated by each light source is different, the light is mixed with each other through the light mixing structure, thereby generating light with uniform color temperature and brightness. "Therefore, the operator does not have to attach to the same or Light sources with similar color temperature and brightness not only simplify the production process, but also reduce material expenditure and reduce production costs. [Embodiment] 201007286 Please refer to FIG. 1 and FIG. 2, which are respectively a perspective view and a bird's-eye view of a backlight module 100 according to an embodiment of the present invention. The backlight module 1 is responsible for providing the display with uniform light regardless of brightness or color temperature. The backlight module 100 has a light source 11 〇, a light guide plate 20, a reflective plate 13〇, and a light mixing structure 140. The light mixing structure 140 is interposed between the light source 11 〇 and the light guide plate 120, and the reflective plate 130 is attached to the light guide plate 130. The upper surface of the light plate 12 is extended to the lower surface of the light mixing structure 140 and the light guide plate 12A. ® Please refer to FIG. 2 and FIG. 3 at the same time, and FIG. 3 shows a bird's-eye view of the light mixing structure 140. The light mixing structure H 〇 mainly includes a light guiding strip 146 for conducting light emitted from the light source 110 to the light guide plate 120. The light guiding strip ι46 may be composed of a transparent optical material such as acryl or poly-f-methyl acrylate. The light guiding strip 146 is provided with a plurality of light incident surfaces 21, a slope 240, a reflection/transmission microstructure 250 and a light exit surface 220. The light incident surface 210 is spaced apart from the first surface ι 42 of the light guiding strip 146 and adjacent to the light source 110 to pass light of the light source 110. The light source 11A can be abutted on the light-emitting surface 210, that is, the light-incident surface 210 of the light source 110 is bonded to each other. In this way, the incident angle of the light incident on the light incident surface 210 can reach ±9 degrees. In the embodiment of the present invention, the light source 11 is adjacent to the light entrance surface 21〇, and there is a gap between the light source 11〇 and the light incident surface 210, so that the light emitted by the light source 110 is first transmitted to the air, and then transmitted to the air. The light entrance surface 21〇 enters the light guide strip 14〇. Such conduction control can reduce the incident angle of the light incident on the light incident surface 210 to within the critical angle (about ±42 degrees), which is advantageous for the subsequent total reflection. The inclined surface 240 is disposed in the light guiding strip 146 adjacent to the light emitting surface 220 and is adjacent to the light surface 210 of 201007286. Each of the inclined surfaces 240 and the respective light incident surfaces 210 are not parallel, so that the light incident from the light incident surface 210 is not easily emitted from the inclined surface 240, and the inner wall of the inclined surface 240 is used to reflect the light incident from the light incident surface 210 to increase the light. The number of reflections and the path of the path are such that the light introduced by each of the light sources 110 is sufficiently mixed in the light mixing structure 140. In general, when light passes through an interface of two media having different refractive indices, the direction of travel of the light changes, such as refraction or reflection. Wherein, when light is incident on the light-diffusing medium by the optically loose medium, total reflection occurs if the angle of incidence of light is greater than the critical angle. It is well known in the art that the principle of critical angles and the magnitude of the critical angle will vary depending on the medium at the ends of the interface. In an embodiment of the invention, the light guiding strip is made of acrylic and has a critical angle of about 42 degrees with air. The embodiment of the present invention utilizes the characteristic β of the critical angle described above. Specifically, the inclined surface 240 has an angle with the light incident surface 210 such that when the light is incident on the inclined surface 240 by the light incident surface 210, most of the light is on the inclined surface 240. The resulting | incident angle is greater than the critical angle, so total reflection occurs. The angle between the inclined surface 240 and the light incident surface 210 can also be adjusted such that a majority of the incident light and the inclined surface 240 are larger than the critical angle of the total internal reflection of the optical material. The angle between the inclined surface 240 and the light incident surface 210 is between 30 and 60 degrees, preferably greater than the critical angle of the light guiding strip 146. In the present embodiment, the angle of the included angle is greater than 42 degrees, preferably 45 degrees. On the other hand, a structure for enhancing total reflection can be performed on the inclined surface 240 such that incident light having incident light smaller than a critical angle can also be reflected by the inclined surface 240. Specifically, the material of the inner wall of the inclined surface 240 may be a 201007286 money film having a high reflection coefficient, such as a mirror surface, and (4) a reflectance of the slope 240. In this embodiment, one end of the inclined surface 240 abuts the light exit surface 220, and another: adjacent to the other inclined surface 240, that is, the inclined surfaces are paired in pairs to form a number: the groove 230 having the V-shaped cross section, the groove 230 is separated from each other Set and staggered with the light exit surface 220. Each of the grooves 23 is aligned with an inner wall of the groove 230 of the light incident surface 210, and the inner wall of the inclined surface 24〇 reflects the light incident from the light incident surface 210. ❹ Specifically, the center of the groove 230 is first to the first The minimum distance of φ 142 is less than the distance between the first 142 and the second face 144, i.e., the groove 230 is a depression on the light guiding strip 146 rather than a protrusion. The angle between the slanting faces 240 in the recess 23 可 may vary depending on the optical characteristics of the light guiding strip 146. In the present embodiment, the angle between the two inclined faces 240 is 9 degrees. In addition, the groove 23A may also include a plurality of slopes 240, and the shape of the grooves 23A may also be semi-circular. The reflective/transmissive microstructures 250 are disposed between the two adjacent light incident surfaces 21A, that is, the reflective/transmissive microstructures 250 and the light incident surfaces 21 are interlaced on the first surface 142 of the light guiding strips 146, and Align the exit surface 22〇. The reflective/transmissive microstructures 250 are transparent to the partially reflective portion of the light reflected from the bevel 24〇. Wherein, the reflective/transmissive microstructure 250 reflects the light partially reflected from the inclined surface 24 and reflects the light to the light exit surface 22A. In addition, some of the light reflected from the bevel 24 穿透 penetrates the reflective/penetrating microstructure 25 传 to pass the light guiding strip 146. The light that is transmitted out of the light guiding strip 146 can be reflected back into the light guiding strip 146 by the reflecting plate 13 设置 disposed around the light guiding strip 146. The reflective/penetrating microstructures 25 can be printed dots, v-cuts or reflectors. In an embodiment of the invention, the reflective/transmissive microstructures 250 are a plurality of V-shaped grooves 252. e 2010 201007286 The light-emitting surface 220 is disposed on the second surface 144 of the light-guiding strip 146 and adjacent to the light guide plate 12G for conducting the mixed light to the light guide plate 12A. In the embodiment of the present invention, the light-emitting surface 22 is provided with a plurality of v-shaped recesses 222' so that light is easily transmitted from the light-emitting surface 220. The light-emitting surface 220 and the light-incident surface 21 are respectively disposed on different planes of the light-guiding strip 146, and are staggered and not aligned with each other, so that light introduced from the light-incident surface 22 is not easily transmitted directly from the light-emitting layer 220. The area of the light-incident surface 21〇 and the light-emitting surface 22〇 can be set according to the size of the light source 110 and the light guide plate 120. When the thickness of the light source is smaller than the thickness of the light guide plate 120, the height of the light-incident surface 21〇 and the area thereof can be smaller than the light-emitting surface. The height of 220 and its area. Vice versa, when the thickness of the light source uo is greater than the thickness of the light guide plate 12, the height and area of the light incident surface may be smaller than the height and area of the light exit surface. In the embodiment of the present invention, the cross section of the light guiding strip U6 is slightly trapezoidal, that is, the first surface 142 of the light guiding strip 146 is parallel to the first surface 144, and the height of the first φ 142 is greater than the interval of the second surface. The height of the light incident surface 210 is made larger than the height of the light exit surface 22A. In the embodiment of the present invention, the area of the light-incident surface 21〇 is larger than the area of the light-emitting surface 220. On the other hand, the light-emitting surface of the light-guiding strip 146 is covered by the reflector 130, which can effectively reduce light leakage during light propagation. phenomenon. Referring to Section 4', a bird's-eye view of a light mixing structure 140 in accordance with another embodiment of the present invention is shown. A plurality of scattering particles 31 are scattered among the light guiding strips 146 of the mixed light junction #(10). Since the scattering particles 31 are scattered between the light incident surface 21, the slope 240, and the light exit surface 22, when the light travels in the light guide strip 146 and is irradiated to the scattering particles 31q, the light is subjected to the scattering particles 31. Refraction or reflection, so that the direction of travel of light changes. Thus, 12 201007286 At the concentration of appropriate scattering particles, the number of times the light is deflected in the light-mixing structure 14〇 can be increased, so that (4) the line is long (four) long, The degree of mixing with other sources of light can be increased. 'Scatter particles + 310 can be formed from a reflective material such as titanium dioxide, sulfur lanthanum, carbonic acid #5, oxygen tilting, zinc oxide cutting compounds such as dioxide. The scattering particles 310 can also be made of an optical material having a refractive index different from that of the light guiding strips 146, such as polystyrene or polycarbonate. According to the embodiment of the present invention, the brightness and color temperature of the respective light sources 110 used in the backlight module 100 need not be the same or similar, as long as the light emitted by each light source 110 is mixed through the light mixing structure 140, the transmission can be made to the guide. The light of the light plate 120 is light having uniform brightness and color temperature. Please refer to FIG. 5 and FIG. 6. FIG. 5 is a top view of the backlight module 100 according to another embodiment of the present invention, and FIG. 6 is a bird's-eye view of the light mixing structure 140. In the present embodiment, the light guiding strip i46 of the light mixing structure 14A has a substantially trapezoidal cross section, that is, the first surface 142 and the second surface 144 are opposite to each other and parallel to each other, and both ends of the two inclined surfaces 240 are adjacent to the first surface 142. And the second surface 144 第一 the first surface 142 of the light guiding strip 146 has two light-incident surfaces 21〇, and a light source 110 is selected adjacent to each other. The color temperature and brightness of the two light sources U0 may be different. In an embodiment of the invention, the color temperatures of the two light sources 11〇 may be complementary colors. When the two complementary colors of light are mixed, a mixture of light similar to white light can be produced. A reflective/transmissive microstructure 250 is disposed between the two adjacent light incident surfaces 210. In an embodiment of the invention, the reflective/penetrating microstructures 25 are a plurality of v-shaped grooves 252. The light-emitting surface 220 is disposed on the second surface 144 to align the reflection 13 201007286 / penetrate the microstructure 250 and adjacent to the light guide plate 12 of the backlight module 1 . One end of the inclined surface 240 abuts the light exit surface 22A, and the other end abuts the light incident surface 210. The two inclined surfaces 24 of the light mixing structure 140 are vertically aligned with the two light incident surfaces 210, and the inclined surfaces 240 are not parallel to the light incident surface 21A. As previously mentioned, the inner wall of the ramp 240 can reflect light incident from the entrance face 21, even full reflection. The light mixing structure 140 further includes a plurality of scattering particles 31 dispersed in the light guiding strips 146 to change the traveling direction of the light in the light guiding strips 146. In other words, even if the color temperature or brightness of the light emitted by each of the light sources 110 is slightly different, the light emitted by the light source 110 is transmitted from the light incident surface 210 of the light mixing structure 14〇, by the inclined surface 24〇, The scattering particles 31 and the reflection/penetration microstructures 250 act such that after the light is sufficiently mixed in the light-mixing structure 140, light of uniform brightness and uniform mixing can be transmitted from the light-emitting surface 220. In this way, the problem of unevenness caused by the difference in light emitted by each of the light sources 11 can be solved. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and it is to be understood that those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; A perspective view of the backlight module. FIG. 2 is a bird's-eye view of the backlight module according to FIG. Fig. 3 is a bird's-eye view showing the light mixing structure according to Fig. 2. Figure 4 is a diagram showing a plan view of a light-mixing structure in accordance with another embodiment of the present invention. Figure 5 is a perspective view of a backlight module in accordance with another embodiment of the present invention. Fig. 6 is a bird's-eye view showing the light mixing structure according to Fig. 5. Component symbol description backlight module 110: light source light guide plate 130: reflector light mixing structure 142: first surface second surface 146: light guide light entrance surface 220: light exit surface groove 230: groove surface 250: reflection / Penetrating microstructure recess 310: scattering particles [mainly 1〇〇12〇14〇144 21〇鲁222 240 252 15