200914887 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種背光模組及其稜鏡片，尤其涉及一種 用於液晶顯示之背光模組及其稜鏡片。 【先前技術】 請芩閱圖1 ’所示為一種習知直下式背光模組1〇〇，其 包括框架11、設置於框架U内部之複數光源12、依次設 置於光源12上方並蓋住框架u之一擴散板13及一稜鏡片 10。其中，擴散板13内一般含有用以擴散光線之散射粒 子。稜鏡片10包括一用以接收光束之入光面1〇1、與入光 面101相對之出光面103以及形成於出光面1〇3之複數長 條形V型凸起1〇5。 複數光源12產生之光線進入擴散板13 ; 均勻擴散後，其繼續進人稜鏡片1G，於稜鏡片1〇之長1 = '型凸起1〇5之作用下使出射光線發生一定程度之: 集，，而提高背光模組1〇〇於特定視角範圍内之亮度。 明併參閱圖2與圖3,光線經擴散板13擴散後變4 "淮亦使散射後之光線入射稜鏡片1〇之 為雜亂。此雜亂光線進入稜鏡片10後於v型凸二: :出射出射光線（如al、a2)會沿靠近£直之方心 於奋 亮度’·惟’部分出射光線(如a3、a4 部分出射先線IT靠近水平方心^ 尉尤線未4效利用；另’仍㈣分光線（如 200914887 a6)於V型凸起1{)5卩面發生折射後又重新進入棱鏡片 1〇 ’此過程中光能損失較大。另，稜鏡片1G之複數V型 凸起105平行排佈，其對光線之聚集作用主要發生於與v 聖凸起105之延伸方向相垂直之平面，而對與v型凸起 之延伸方向相平行之平面之光線無聚集作用，使該部分光 線未能有效利用。 【發明内容】 雲於上述狀況’有必要提供—種可提高光線有效利用 率、出光亮度高之背光模組及其稜鏡片。 -種稜鏡4，其纟―翻本體㈣，該透明本體包括 c及與該第一表面相對之第二表面。該透明本體之 弟一表面與第二表面均具有複數微凹槽，每一微凹槽包括 =連接之四内側面’每一内側面之水平寬度自該微凹槽 所在之表面向稜鏡片内逐漸減小。 7種背光模組，其包括光源、擴散板及稜鏡片，該擴 鏡片依次設於該光源之上方，該稜鏡片由一透明 本體構成’該透明本體包括第—表面及與該第一表面相對 之弟—表面。該透明本體 — 數矜m描— 弟表面與弟一表面均具有複 义凹t，母一微凹槽包括依次連接之四内側面，每— =面之水平寬度自該微凹槽所在之表面向稜鏡片内逐漸減 述&鏡之第-表面與第；表面均具有複數微 才曰’由於微凹槽具有傾斜表面結構，該第—表面之微凹 之傾斜表面結構與㈣二表面之微凹槽之傾斜表面結構 200914887 配合而協同作用於入射該棱鏡片之光線，故可使採用該稜 鏡片之月光板組尚光線有效利用率以及出射光亮度。 【實施方式】 下面將結合附圖及實施例對本發明之背光模組及其稜 鏡片作進一步之詳細說明。 請參閱圖4,所示為本發明較佳實施例—之背光模組 200,其包括稜鏡片20與依次設置於稜鏡片2〇 一側之擴散 板21、複數光源22及用於容納複數光源22之框架23。稜 鏡片20與擴散板21蓋住框架23。光源22發出之光線直 接或藉由框架23反射進入擴散板21，經擴餘21擴散後 再進入稜鏡片20進行聚集。 ㈣參閱圖5，稜鏡片2〇由一透明本 =第：表面201及與第一表面2〇"目對之第二表d :='201具有複數第一微凹槽2〇3,第二表面20 具有獲數弟二微凹槽204。 凊再參閲圖4愈圖6，筮 主τ 其上之第-微凹槽二=面向擴散板21， 二表面逝背向擴散板21，、上之；稜：片:〇之光線。第 從稜鏡片20出射之光 ;^弟―微凹槽2⑽用於使 一微凹槽203呈規則陣㈣二木作用。本實施财複數第 兩兩相對之四等腰三角形 凹槽203之内側面為 狀。於X方向上，相鄰第一微微凹槽加為四稜錐 取值範圍為0.025毫f i 7 ^ 曰203之中心間距 '之 "未至1宅米；於Y方向上，相鄰第— 200914887 微凹槽203之中心問v 米。藉由調整第-微叫^毫米至1毫 之增光率及出光視角。 可凋整稜鏡片20 本實施例中複數第二微凹 則陣列緊㈣佈，X方㈣=四稜錐狀且呈規 ..向與Y方向之相鄰第二微凹# 204 之甲心間距滿足上述χ 乐㈣槽204 -表面2〇1上之第一“揭广取值视圍。需要指出，第 微凹槽203兩兩相對之内側 之夹角相等，定義1為s，目“ 丁〈内側面所形成 产·第而2 1之取值範圍為45度至12〇 又，弟一表面202上之第二微凹栲 所形成之夾角相等，定義宜/兩相對之内側面 度至12〇度。為使第一表面：S；JS;之取值範圍為6。 好之光線收敛效果，該第一表 /凹槽203具有更 ^ ^ ^ 表面201上之第一微凹槽203 兩兩相對之内側面所形成之夹角Si優選為45度至9〇度。 =，為避免光線於通過稜鏡片2Q之過程中發生干涉，該 、表面201之第—微凹槽2Q3與該第二表面逝之第二 微凹槽204 -般交錯設置，即第一微凹槽2〇3之中心位於 兩相鄰之第二微凹槽204之間。 可以理解，該第一微凹槽2〇3與第二微凹槽綱兩兩 目對之内側面所形成之夹角亦可不相#，藉由調整失角之 角度，可調整光學板之增光率及出光視角。 稜鏡片20之總體厚度可為〇.5毫米至3毫米。稜鏡片 2〇可由聚曱基丙烯酸甲酯、聚碳酸酯、聚苯乙烯、苯乙烯 -甲基丙烯酸甲醋共聚物中之一種或一種以上之材料注塑 成型而成。製備過程中需於模具上設置與第一微凹槽2〇3 200914887 .以及第二微凹槽204相應之λ ^ * 巴起、，構，以便使稜鏡片20 可於單次注塑過程中成型。 光源22可為線光源或點光源，例如發光二極體與冷陰 極螢光燈。 一框架23可由具有高反射率之金屬或塑膠製成，或塗佈 有高反射率塗層之金屬或塑膠製成。 由於稜鏡片2〇之第-表面2〇1上之第一微凹槽2〇3 :弟一表面202上之第二微凹槽2〇4具有不同角度之傾斜 表面結構’第-微凹槽加之傾斜表面結構與第二微凹槽 2〇4之傾斜表面結構相配合而協同作用於入射稜鏡片20之 光線，故易於使制稜鏡片2()之背光模組細提高光線有 效利用率以及出射光亮度。 具體於本實施例中，當光線從第一表面201進入稜鏡 二叨時，由於第一表面2〇1具有複數第一微凹槽咖，第 微凹槽2G3傾斜之表面結構使得光線向垂直於稜鏡片烈 ,方向發生一定程度之收斂；當光線從第二表面搬出射 日守’由於第二表面逝具有複數第二微凹槽綱 =綱傾斜之表面結構使得出射光線向垂直於稜鏡片—2〇 =進-步聚集’從而可較大程度提高f光模組之 片與此同時，由於第—表面2〇1於光線進入稜鏡 南，將大部分光線收斂至靠近垂直於稜鏡片20之方 i it當光線從第二表面搬出射時，與稜鏡片2G相平行 “ Μ較少’從而減少了再次返回棱鏡片20之光 、’·使更多之光線被有效利用。 200914887BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight module and a cymbal thereof, and more particularly to a backlight module for a liquid crystal display and a cymbal thereof. [Prior Art] Please refer to FIG. 1' as a conventional direct type backlight module 1A, which includes a frame 11, a plurality of light sources 12 disposed inside the frame U, and sequentially disposed above the light source 12 and covering the frame. One of the diffusion plates 13 and one of the dies 10. Among them, the diffusion plate 13 generally contains scattering particles for diffusing light. The cymbal 10 includes a light incident surface 1 〇1 for receiving a light beam, a light exit surface 103 opposite to the light incident surface 101, and a plurality of elongated V-shaped projections 1 and 5 formed on the light exit surface 1〇3. The light generated by the complex light source 12 enters the diffusing plate 13; after being uniformly diffused, it continues to enter the cymbal 1G, and the outgoing light is caused to a certain extent by the length of the cymbal 1 = 'type protrusion 1 〇 5: The brightness of the backlight module 1 is increased within a specific viewing angle range. Referring to Figures 2 and 3, the light diffuses through the diffuser 13 and becomes 4 " Huai also causes the scattered light to enter the cymbal 1 杂. This messy light enters the cymbal 10 after the v-shaped convex two: : The outgoing ray (such as al, a2) will emit light along the part of the square that is close to the straight edge (such as a3, a4 part of the first shot) The line IT is close to the horizontal square heart ^ The 尉 线 line is not used for 4 effects; the other 'still (four) part of the light (such as 200914887 a6) is refracted after the V-shaped protrusion 1{)5 卩 re-entry into the prism sheet 1〇' The loss of medium light energy is large. In addition, the plurality of V-shaped protrusions 105 of the cymbal sheet 1G are arranged in parallel, and the effect of focusing on the light mainly occurs on a plane perpendicular to the extending direction of the v-shaped protrusion 105, and the direction of extension of the v-shaped protrusion is opposite to The light in the parallel plane has no aggregation, so that the part of the light is not effectively utilized. SUMMARY OF THE INVENTION In the above-mentioned situation, it is necessary to provide a backlight module and a chip which can improve the effective utilization rate of light and high brightness. - a crucible 4, the crucible - the body (four), the transparent body comprising c and a second surface opposite the first surface. The surface of the transparent body has a plurality of micro-grooves, and each of the micro-grooves includes a fourth inner side of the connection. The horizontal width of each inner side is from the surface of the micro-groove to the cymbal. slowing shrieking. The backlight module includes a light source, a diffusion plate and a cymbal. The lens is sequentially disposed above the light source. The cymbal is composed of a transparent body. The transparent body includes a first surface and is opposite to the first surface. Brother - surface. The transparent body - the number of 描m description - the surface of the younger brother and the surface of the younger brother have a complex concave t, and the mother-micro-groove includes four inner sides which are sequentially connected, and the horizontal width of each surface is from the surface of the micro-groove The surface-surface and the surface of the mirror are gradually subtracted from the inside of the cymbal; the surface has a plurality of micro-clamps. Since the micro-groove has an inclined surface structure, the inclined surface structure of the dimple of the first surface and the (four) two surfaces The inclined surface structure 200914887 of the micro-groove cooperates with the light incident on the prism sheet, so that the moonlight panel of the cymbal can be used for efficient utilization of light and brightness of the emitted light. [Embodiment] Hereinafter, a backlight module and a prism lens thereof according to the present invention will be further described in detail with reference to the accompanying drawings and embodiments. Referring to FIG. 4, a backlight module 200 according to a preferred embodiment of the present invention includes a cymbal 20 and a diffusion plate 21 disposed on one side of the cymbal 2 依次, a plurality of light sources 22, and a plurality of light sources. Frame 23 of 22. The prism lens 20 and the diffusion plate 21 cover the frame 23. The light from the light source 22 is directly or reflected by the frame 23 into the diffusion plate 21, diffused through the expansion 21, and then enters the cymbal 20 for accumulation. (4) Referring to Fig. 5, the cymbal 2 〇 is composed of a transparent book = the surface 201 and the first surface 2 〇 " the second table d := '201 has a plurality of first micro grooves 2 〇 3, the first The two surfaces 20 have a plurality of micro-grooves 204. Referring to FIG. 4, FIG. 6 shows that the first-micro-groove 2 on the main τ is facing the diffusion plate 21, and the two surfaces are facing away from the diffusion plate 21, and the upper side; the rib: the piece: the light of the sputum. The first light emitted from the cymbal 20; the micro-groove 2 (10) is used to make a micro-groove 203 function as a regular array (four). The inner side of the fourth isosceles triangular groove 203 of the second and second opposites of the present embodiment is shaped like this. In the X direction, the adjacent first microgrooves are added as a quadrangular pyramid with a value ranging from 0.025 millifi 7 ^ 曰 203 to the center spacing 'of less than 1 house meter; in the Y direction, adjacent to the first 200914887 The center of the micro-groove 203 is asked to be m meters. By adjusting the first-micro-called mm to 1 millimeter of light gain and light viewing angle. The ruthenium sheet 20 can be smashed. In this embodiment, the plurality of second dimples are arranged in a tight (four) cloth, and the X-square (four)=tetragonal pyramid-shaped and regular gauges are oriented to the second dimples adjacent to the Y-direction. The spacing satisfies the first "extended value" of the above-mentioned 四 ( (4) slot 204 - surface 2 〇 1. It should be noted that the angle between the opposite sides of the micro-groove 203 is equal, and the definition 1 is s, " The formation of the inner side is the same as the range of the angle of 45 degrees to 12 〇, and the angle formed by the second micro-concave ridge on the surface 202 of the younger brother is equal, and the definition is suitable/two opposite inner sides. Up to 12 degrees. To make the first surface: S; JS; the value range is 6. For better light convection, the first surface/groove 203 has a larger angle γ of the first micro-groove 203 on the surface 201. The angle Si formed by the opposite inner sides is preferably 45 to 9 degrees. =, in order to avoid interference of light in the process of passing through the cymbal 2Q, the first micro-groove 2Q3 of the surface 201 and the second micro-groove 204 of the second surface are arranged in a staggered manner, that is, the first dimple The center of the groove 2〇3 is located between two adjacent second micro grooves 204. It can be understood that the angle formed by the inner side surfaces of the first micro-groove 2〇3 and the second micro-groove can also be different, and the brightness of the optical plate can be adjusted by adjusting the angle of the lost angle. Rate and light angle of view. The overall thickness of the cymbal sheet 20 can be from 55 mm to 3 mm. The ruthenium sheet 2 can be injection molded from one or more materials selected from the group consisting of polymethyl methacrylate, polycarbonate, polystyrene, and styrene-methyl methacrylate copolymer. During the preparation process, the first micro-groove 2〇3 200914887 and the second micro-groove 204 are arranged on the mold, so that the cymbal 20 can be formed in a single injection molding process. . Light source 22 can be a line source or a point source, such as a light emitting diode and a cold cathode fluorescent lamp. A frame 23 can be made of metal or plastic having high reflectivity or metal or plastic coated with a high reflectivity coating. The first micro-groove 2〇3 on the first surface 2〇1 of the cymbal 2〇: the second micro-groove 2〇4 on the surface 202 has a different angle of the inclined surface structure 'the first micro-groove In addition, the inclined surface structure cooperates with the inclined surface structure of the second micro groove 2〇4 to cooperate with the light incident on the cymbal 20, so that the backlight module of the cymbal 2() is easy to improve the effective utilization of light and The brightness of the exit light. Specifically, in the embodiment, when the light enters the second surface from the first surface 201, since the first surface 2〇1 has a plurality of first micro-grooves, the surface structure of the first micro-groove 2G3 is inclined such that the light is vertical. In the case of 稜鏡 烈 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , - 2 〇 = step-by-step aggregation, which can greatly increase the slice of the f-light module. At the same time, since the first surface 2〇1 enters the south of the ray, most of the light converges close to perpendicular to the cymbal. The square 20 i it, when the light is taken out from the second surface, is parallel with the cymbal 2G, "less '", thereby reducing the light returning to the prism sheet 20 again, '· enabling more light to be effectively utilized. 200914887
進一步地’由於第-微凹槽2G3與第二微凹 = 具有依次連接之四内側面，嶋於J =::二，出射光線都可被有效聚集，從而充 :利用$方向之光線以更進一步提高背光模組之正面 出射光免度。 另，稜鏡片20係採用注塑成型方式—體成型，而傳統 之&鏡片係採用於透明板上塗覆樹脂膜成型微結構之方法 2型’兩者相比，稜鏡片2G更易實現快速量產及降低成 丄另，使用時’稜鏡片2〇内不存在光線界面損失，具有 更门之光線利用率。此外’傳統方法於透明板上塗覆樹脂 膜成型微結構，由於塗覆之樹賴與透明板之間結合力一 =較低且樹脂膜本身難以形成高強度，故容易導致微結構 被到傷、壓損，而採用注塑成型方式成型之稜鏡片2〇,立 =一微凹槽203及第二微凹槽剔與稜鏡片2〇之其他部 成’可使仔第—微凹槽2〇3及第二微凹槽綱具有 車乂问之、構強度’同時還能提升第一微凹槽加及第二微 ，凹=204與稜鏡片2〇之其他部分之結合力，故可避免或減 第微凹槽203及第二微凹槽204於稜鏡片20使用過程 中被損壞之危險。 a可以理解，第二表面202亦可用於面向擴散板21，而 使第一表面2〇1背向擴散板21。 明參閱圖7，所示為本發明較佳實施例二之棱鏡片 3~〇。稜鏡片30與實施例一之稜鏡片2〇相似，其不同在於： 第一表面301之第一微凹槽3〇3呈規則陣列間隔排佈。 11 200914887 請參閱圖<· 你稜鏡片40心/；；為本f明較佳實施例三之禮鏡另 筮^ 〜属轭例—之稜鏡片20相似，其不同在於·· 鱼 微凹槽403為四稜台狀，且槽底4031 二：。之形狀均為正方形，第-微凹槽-呈規則陣 請參見圖9，所千氣士 & 口口 ± I稜鏡片50”：:為= 月較佳實施例四之稜鏡片 n /、實施例—之稜鏡片20相似，其不同在於： 轉口Hi1之第一微凹槽503為四稜台狀，且槽底5031 二：之形狀均為長方形’第一微凹槽5。3呈規則陣 可以理解’上述稜鏡片中 稜鏡片之側邊形成一銳角。 冑之陣列方向還可與 實施: = = 例二、較佳實施例三與較佳 表面’且兩表面之微凹槽結構可以不同 台狀；或第-表面之第一微凹槽為槽底第；：：曹為四稜 正方形之四稜台狀，第二表面之第二微凹^底狀二為 之形狀均為長方形之四棱台狀。 胃為槽底、槽口 綜上所述，本發明符合發明專利要 利申請。惟，以上所述者僅為本發明之較J = f出專 :::範圍並不以上述實施方式為限，舉凡：：上本 声二於援依本案發明精神所作之等效修飾：變：Ϊ 應包含於以下之申請專利範圍内。 飞文化，皆 12 200914887 【圖式簡單說明】 圖1係一種習知背光模組之剖面示意圖。 圖2係圖1所示背光模組之稜鏡片之立體圖。 圖3係圖2所示棱鏡片沿III-III線剖開之光線出射示意 圖。 圖4係本發明較佳實施例一之背光模組之剖面示意圖。 圖5係圖4所示背光模組之棱鏡片之立體圖。 圖6係圖4所示背光模組之稜鏡片之仰視圖。 圖7係本發明較佳實施例二之棱鏡片之仰視圖。 圖8係本發明較佳實施例三之稜鏡片之仰視圖。 圖9係本發明較佳實施例四之稜鏡片之仰視圖。 【主要元件符號說明】 (本發明） 背光模組 200 稜鏡片 20 、 30 、 40 、 50 第一表面 201 、 301 、 401 、 501 第二表面 202 第一微凹槽 203 、 303 、 403 、 503 第二微凹槽 204 第一微凹槽槽底 4031 、 5031 第一微凹槽槽口 4032 ' 5032 擴散板 21 光源 22 框架 23 13Further, since the first micro-groove 2G3 and the second dimple = have four inner sides connected in sequence, and J =:: two, the outgoing light can be effectively concentrated, thereby charging: using the light of the direction to Further improving the front light output of the backlight module. In addition, the cymbal 20 is made by injection molding, while the conventional & lens is made by coating the resin film on the transparent plate. The type 2 is easier to achieve mass production. And reduce the sputum, in addition, when used, there is no light interface loss in the cymbal 2 ,, which has a light utilization rate of the door. In addition, the conventional method applies a resin film to form a microstructure on a transparent plate, and since the bonding force between the coated tree and the transparent plate is low and the resin film itself is difficult to form high strength, the microstructure is easily damaged. Pressure loss, but the injection molding method of the cymbal 2 〇, vertical = a micro-groove 203 and the second micro-groove and the other part of the cymbal 2 成 2 can make the 第 - micro groove 2 〇 3 And the second micro-groove has the structure and strength of the vehicle, and can also improve the combination of the first micro-groove and the second micro, concave=204 and other parts of the cymbal 2〇, so it can be avoided or The risk of the micro-recess 203 and the second micro-groove 204 being damaged during use of the cymbal 20 is reduced. a It will be understood that the second surface 202 can also be used to face the diffuser plate 21 with the first surface 2〇1 facing away from the diffuser plate 21. Referring to Figure 7, there is shown a prism sheet 3~〇 according to a second preferred embodiment of the present invention. The cymbal sheet 30 is similar to the cymbal sheet 2 of the first embodiment except that the first microgrooves 3〇3 of the first surface 301 are arranged in a regular array. 11 200914887 Please refer to the picture <· Your 稜鏡 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 The groove 403 has a quadrangular prism shape, and the groove bottom 4031 is two. The shape is square, the first micro-groove - in the regular array, please refer to Figure 9, the thousand gas & mouth mouth * I 稜鏡 50":: = = month, the fourth embodiment of the n n n /, implementation For example, the cymbal sheet 20 is similar, and the difference is that: the first micro-groove 503 of the mouthpiece Hi1 is quadrangular-shaped, and the groove bottom 5031 has a rectangular shape of the first micro-groove 5. 3 is a regular array. It can be understood that the side of the cymbal sheet in the above-mentioned cymbal sheet forms an acute angle. The array direction of the cymbal can also be implemented: = = Example 2, preferred embodiment 3 and preferred surface 'and the micro-groove structure of the two surfaces can be different The first micro-groove of the first surface is the bottom of the groove;:: Ca is a quadrangular square of a quadrangular square, and the second dimple of the second surface is a rectangular shape. The invention is in accordance with the invention of the invention, and the invention is in accordance with the invention patent application. However, the above description is only for the J = f of the present invention::: The above-mentioned embodiments are limited to the following:: The equivalent modification of Shangbensheng II in the spirit of the invention according to the invention: change: Ϊ It is included in the following patent application. Fei Culture, all 12 200914887 [Simple description of the drawings] Fig. 1 is a schematic cross-sectional view of a conventional backlight module. Fig. 2 is a perspective view of the cymbal of the backlight module shown in Fig. 1. 3 is a schematic view showing the light exiting of the prism sheet of FIG. 2 taken along the line III-III. FIG. 4 is a schematic cross-sectional view of the backlight module of the preferred embodiment of the present invention. FIG. Fig. 6 is a bottom view of a prism of the backlight module shown in Fig. 4. Fig. 7 is a bottom view of a prism sheet of a preferred embodiment of the present invention. Fig. 8 is a third embodiment of the present invention. Fig. 9 is a bottom view of a cymbal according to a preferred embodiment of the present invention. [Main element symbol description] (Invention) Backlight module 200 cymbal 20, 30, 40, 50 First surface 201 301, 401, 501 second surface 202 first micro-grooves 203, 303, 403, 503 second micro-grooves 204 first micro-groove groove bottoms 4031, 5031 first micro-groove slots 4032 ' 5032 diffusion plate 21 light source 22 frame 23 13