200903062 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種具有良好擴光效果且能大幅提高入光效率之入光 結構的導光板。 【先前技術】 4又線光源例如冷陰極燈管(cold cathode fluorescent lamp ; CCFL)由 於體積較大，較不適用於小體積的手持式電子裝置。因此，例如行動電 話之手持式電子裝置，通常使用點光源作為其液晶顯示模組之側光源。 圖1為顯示一習知背光模組1〇〇之示意簡圖，如圖i所示，例如發光二 極體104(light-emitting diode ; LED)之點光源鄰接導光板搬之一入光側 面102a，且導光板1〇2之底面i〇2c形成有V型溝槽1〇6所構成之稜鏡結 構。於此一習知設計中，由於點光源的發光角度與能量關係依循朗伯放 射定律(Lambert’s emission law)，當採用發光二極體104作為液晶顯示模 組之側光源，並搭配稜鏡片（未圖示)將光線導正至導光板1〇2出光面1〇2b 法線方向附近後，如圖2所示，在鄰近入光側面102a的局部區域容易出 現對比強烈的焭帶11〇及暗帶112分佈，而明顯降低導光板1〇2的輝度 分佈均勻性。 因此，於習知技術中，一種入光結構設計被提出以改善上述問題， 例如圖3所示於入光面122上形成三角柱結構物而構成一 v入子結構 120，或如圖4所示於入光面132上形成圓柱結構物而構成一 r入子結構 130藉以&供光擴散效果以改善導光板入光處的亮/暗帶差異問題，同時 提咼點光源的入光效率。然而，習知V入子結構12〇或尺入子結構13〇 的擴光迠力有限，即使設置這些入光結構，導光板上分佈對比強烈的亮/ 暗帶區域面積仍相當大，使整體輝度分佈均勻性仍不佳且無法進一步提 高導光板有效出光區的面積。 200903062 【發明内容】 ^此’本發明之目的在提供_種具有良好擴光效果越大幅提古入 提^職罐倾⑽均^能 線並接：至少-點光一 m枝 3人先面、—出光面、一光反射面、及複 光面逸入^ 導出。光反射面位於出絲對側以將由入 反之光線導向出光面。導光板具有-有效出光區及介於有 ^及點光源間之—過渡區’且複數入光結構分佈於導光板之過渡 二遭遇入射光之正面為部份橢圓柱面，且該橢圓柱面 的光擴賊果計，因該入光結構可提供良好 較習知入光結構具有較佳的入光效率及平均輝度紅面積的放果，且相 光線態樣種用以接收來自至少一點光源發出之 複數入光=之導光板，包含一入光面、—出光面、一光反射面、及 板内部二光面接收點光源發出之光線’且於導光 入光:nr餘__。歧射面位於出光_以將由 有效出光區及二面。導光板具有一有效出光區及介於 複數入光結構分佈於導光板之過 =。各.光結«親人縣之正㈣— = 面指向相反方向凹入之叫藉由此一設計= ㈣光擴散效果，故可將點辆、至有《舰的距離縮短 此維持良好的輝度均勻性，獲得擴大導光板上的有效出光區面積的 200903062 效果’且她習知人光結構具有較佳的人光效率及平均輝度。 【實施方式】 圖5為-示意圖’顯示本發明導光板設計之—實施例。如圖5所示， 導光板12制以接收至少_點光源發出之光線(圖示為兩個發光二極體 14)並將其導^導光板12鄰近發光二極體14之側面形成為_入光面 Ha，與入光面12a形成—夾肖之頂面形成為—出光面⑶，錄於出光 面既對側之底面形成為一光反射面⑶。光反射面&整個表面上分佈 有V型溝槽】8所構成之多個稜鏡結構，且各個v型溝槽18之長袖方向 相互平行。發光二極體14發出之光線經由入光面12&進入導光板U内 部後’光反射面12c再將於導光板12内部行進之光線導向出光面⑶， 最後光線經由出光面12b離開導光板12。 依本實施例之設計’人絲12a形成有多個侧人光結構，各個 麵入光結構1“長財向彼此平行方式_於人絲i2a上，且其分 佈區域至少涵蓋各個發光二極體14於入光面12a上的概略投影區域。擴 圓入光結構16遭遇人射光之正面為部份侧柱面恤，且橢圓入光結構 16之頂φ 16b具有部份橢圓外形。圖6為說明擴圓入光結構16較習：r 入子結構具較佳光擴散能力之說關。如圖6所示，人射光㈣遭遇r 入子結構之正圓弧面13〇a偏折後之行進路徑為路徑Cm(虛線部份）. 另一杨入射光㈣遭遇橢圓形人光結構之橢圓柱面恤偏折後的行 進路徑為路⑫El’實線部份）。由比較路徑C1_C4她路彳之偏 移距離與路徑E1-E4相較路徑n_M偏移距離兩者可明確看出，侧柱面 ⑹固有的幾何外形可帶來增大人射絲移距離的效果，意即侧入光壯 構16的光練能力_較佳。耻，依本實施例之設計，如圖7所干， _柱面16a軌跡依循方程式(χ2/αν(Υγ) = i (其中α為長轴且万 f i 200903062 為短轴’· α以）。再者’橢圓柱面16a離入光面仏最遠距離之點p與 入光面12a的距離，設為大於橢圓柱㈣續入光面m相交之兩端點 Μ、N的戴距時，有較佳的光擴散效果。 請再參考圖5 ’於點光源作為側光源的環境下，導光板可區分為一有 效出^區ΕΑ及-過渡區ΤΑ，過渡區ΤΑ鄰近縣驗置而具有對比強 烈之免/暗較佈’紐藉由改變醜社小及疏密樹㈣成為一留白 區。於纽_ ΕΑ巾，@紐已擴錄辆…故可疊合—液晶顯示 面板之有效齡區(ΑΑ區)作為提供面統之實際作祕域。幻8忖標 模組·之習知V人子結構為例，當發光二極體至有效出光區μ 距離為祕顏時，導光板前端亮/暗帶輝度差異值為刪5咖2，該值 ==Γ值，若導光板前端的亮/暗帶輝度差異值大於該臨界 為不佳之輝度均勻性。再者，若縮短點光源至有效 =以㈣，會增峨赠_爾_㈣值。因此，藉 由本實關_人紐構10糊_的缝散絲，可將物原至有 效出先區ΕΑ的距離縮短，且仍能維持良好的輝度均勻性(亮鳩 ^乃小於臨界值）’獲得增加導光板上__ Μ二二 圖8Α至圖9Β為顯示於點光源至 田剩>文果 時，利用不同人光結構而得之光能量有;1出光區的距離為4.65麵 ^ π 里杈擬分佈圖。比較圖8Α及圖 知，圖8B之波峰呈平坦的梯形而圖 ®及圖8B可 請之橢圓入光結構16較圖认之習知/峰:錢的二㈣，可看出 同樣比較圖9A及圖9B可知，圖 ^構有較佳的擴光能力。 呈尖銳的三角形，可看出圖9B的擴圓入而圖％之波峰 子結構有較佳的擴光能力π此，因翻=構16較圖9A的習知R入 果使過渡區TA的面積縮小，換言之二結構16有極佳的光擴散效 EA面積的效果。 、 请大巾§增加導光板有效出光區 200903062 依本實施例之設計，橢圓入光結構16僅需設置於過渡區ta 錢散效脚可，其於導输12上的卿及分齡式並祕定。舉例而 5 ’形成於入光面12a上的橢圓入光結構並不需如圖5所示均具有相同 ，寸*可如J0A所不’形成於入光面12a上的兩相鄰橢圓入光結 構16具有不同的尺寸。另外，如圖觸所示，擴圓入光結構Μ可為形 成於入光面⑵上賴導光板12内部凹人之凹槽結構，而不限定為圖$ 所不大出於V光板平面外之凸塊賴。再者，麵人光結構16並不限定 於形成於人光面12a上’例如亦可如gjn所示，於過渡區TA内形成複 數凹槽結齡對祕贿光二鋪14位置制I Μ 16 亦可如圖12所示，橢圓入光結構16同時形成於入光面ΐ2&上及除該入 光面外之過渡區域TA内，以進一步提高光擴散效果。再者，於圖η所 示之實施例中’形成於入光面12a之橢圓入光結構16的橢圓柱面指向朝 向發光二極體14 ’而形成於除入光面外之過渡區域TA内的姻入光結 構16其橢圓柱面指向遠離發光二極體14，但此一配置並不限定，可視實 際光擴散效果任意變化。 、 圖13為顯示本發明另一實施例之示意圖。如圖13所示，於採用單 顆發光二極體Μ作為側光源環境下，發光二極體w可置於鄰近導光板 2之角。p處’且導光板12之角部形成一截面以分佈橢圓入光結構16 且作為入光面12a。再者，與該入光面12a鄰接之導光板側面22可如圖 13所示為一平面或如圖14所示為一曲面。 一圖15為顯示本發明另一 w型入光結構實施例之示意圖。如圖15所 示依本實施例之s又什，導光板32之反射面32c分佈有v型溝槽18所 構成之多個稜鏡結構’且導光板32之入光面仏形成有多個w型入光 、。構36。各個W型入光結構36以長軸方向彼此平行方式排列於入光面 200903062 a上，且其分佈區域至少涵蓋各個發光二極體Μ於入光面必上的概 域。w型人光結構36其遭遇人射光之正面為—域側面恤， 該柱體側面施係為-曲面，且該曲面具有至少一朝該曲面指向相反方 向凹入之凹陷部36b，使整個入光結構36呈現w字形外觀。該柱體側面 a之外形僅需為-曲面即可’例如面⑽ΐόΑ)、橢圓柱面(圖遍）、 或曲率非固定之孤面(圖16Β)均可，且往相反方向凹入之凹陷部施苴截 面外形並不限定，例如可為_形(圖16Α、圖膽）、三角形(圖ΐ6Β、圖 胞）、或圓形(圖16C、圖16F)均可。於本實施例中，當柱體侧面3知為 -圓柱側面時’該圓柱側面之曲率半徑為至麵㈣較佳，當柱 體側面36a為一姻柱面時，姻柱面與入光面之最大距離以小於:圓 ^面與入光面相交之截距較佳。另外，如圖_及圖她所示，當凹陷 部36b具有三角形之凹入面設計時，該凹入面頂角㈣度範圍為2度至 150度較佳。 圖Π為說明W型入光結構36較習知R入子結構具較佳光擴散能力 之說明圖。、如圖17所示，因w型人光結構36具有1陷部施，入射 光11-13遭遇凹陷部36b之邊界面會產生大幅度偏折，意即光路徑躺_紹 會較無凹fe部之光路;^ C1_C3有較大之偏移距離。因此，具凹陷部遍 之W型人光結構36有良好_光效果，如此即可縮減點光源至有效出 光區的距離而不會使導光板前端的亮暗差異值超^臨界值，獲得擴大導 0板的有效出光區EA面積的效果。圖18A至圖19B為顯示於點光源至 t光板有效出光區的距離為465rnm時，利用不同入光結構而得之光能量 模擬分佈圖。比較圖18A及圖18B可知，圖18B之波峰呈平坦的梯形而 f 18A之波峰呈尖銳的三角形’可看_ 18_W型人光結構36較習 去V入子結構有較佳的擴光能力。同樣比較圖19A及圖可知，圖19B 之波峰呈平坦的梯形而圖肌之波峰呈尖銳的三角形，可看出圖邮的 200903062 子結構有較佳的擴光能力。 W月卜 人光結構16之排列及分佈方式變化，皆適用本 —例之w型入光結構36。舉偏令w , 白適用本 光面32a上且朝導光板32 :結構36可為形成於入 平面外之凸塊結_ 15) ; =2〇)，或突出於導光板 僅形成於除該入光面32a外之過、、似^可，成於入光面孤上、 L 卜之過虹域ΤΑβ、或同時形成於入光面32a t卜之過渡區域TA内。另外，如圖2〇及圖21所示，當 I結構36搭配早—點絲時，該點光源同樣可設置於鄰近導光板 卩且亦可於入光面上形成橢圓入光結構16，再於除該入光面外 之過渡區域TA内形成W型人光結構％。或者，可於入光面上形成％型 °鼻再於除該人光面外之過渡區域TA内形成橢圓人光結構16。 ¥然’本發明之橢圓入光結構16或w型入光結構36設計，亦可搭配習 R入子或V人子結構之導光板制以提高擴級果。舉綱言，可 如圖22所示，於人光面上形成V人子結構120，再於除該人光面外之過 渡區域TA内形成w型入光結構％。或者，如圖幻所示，亦可於入光 、幵^/成V入子結構120,再於除該入光面外之過渡區域τα内形成橢圓 光、’、^構16。另外在過渡區域TA内，可以對應每一個發光二極體μ位 置僅设置一個W型入光結構36或橢圓入光結構16，也可以對應每—個 毛光一極體14位置設置排列呈一橫列之多個w型入光結構36或糖圓入 光結構16。 圖24表列出發明人實際模擬本發明與習知入光結構出光特性而得之 數值。於相同條件下，點光源發出之入射光經由橢圓入光結構16擴光後， 备點光源至有效出光區直線距離縮減至2.5mm時，導光板前端的亮/暗帶 輝度差異值為187.9 cd/m2，此值在臨界範圍内，且總光輻射通量為〇.1 u W，平均輝度為74.52cd/ m2。因此，本發明之橢圓入光結構16相較習知 12 200903062 v 入子結構不僅可縮短點光源至有效出光區的直線距離(縮減抓鳩）， 曰。有效出光區面細加5 57%)，且可大幅提高人光效補升2廳) =均輝度(提升14·78%)。另—方面，點光源發出之人射光經由W型入 36擴光後’當點光源至有效出光區直線距離縮減至2 5麵時，導 ^反我的满帶輝度差異值為删6咖2，此值在臨界侧内，且總 射通量為〇.113 W ’平均輝度為75編m2。因此，本發明之w型 =結構36她人侦構不财驗點辆至有效出紐的直線 ，離(縮驗継），增加有效出光區面積(增加5 57%)，且可大幅提高入 21.62〇/〇)^^#^(^ 14.78〇/〇)〇 , i及平均从結構36她姻人光結構16可更進—步提高入光效 者，依本發明設計之擴圓入光結構16，並不需如圖7所示，橢圓 ★面⑽具有完全依循方程式(咖2) + (的的=1的執跡，而僅需且有 大致為橢圓的軌跡，即能獲得本發明 果。舉例而吕，橢圓柱面16a 勺3 °》正橢^的執跡區段及部分正圓的軌跡11段(圖25A)、同時 25B ^ 25C) . « 為夕線奴構成之近似橢圓（圖25D)等變化均可。 面上另=!T例橢圓入光結構16均形成於為-平•光 面AR 26所示，_人光結構16亦可形成於一弧 上該孤面AR的曲率半徑W交佳為〇.3_至i 2聰 :構16於狐面AR上的分佈角度以為〇度至⑽度·，且較佳為7〇产 50度，圓人光結構16的橢附主面具有長度不等 二 /5 ’且長細與短軸P之比值較佳為⑵至丨… '、 以上所述僅為舉例性’而非 '。 不限定形成V型溝槽所構成之稜鏡；^ 例如於導光板反射面上並 兄、、、°構，亦可形成如弧形結構物等任一 13 200903062 種導光微結構，僅需能麟將料板内部行進之猶導㈣效 脫離本發明之精神與範.，而對其進行之等效修改或變I 均應包δ於後附之申請專利範圍中，而非限定於上述之實施例。更 【圖式簡單說明】 圖1為顯示一習知背光模組之示意圖。 圖2為顯示m光板亮/暗帶分佈之示意簡圖 圖3為顯示一習知入光結構之示意圖。 圖4為顯示另一習知入光結構之示意圖。 圖5為-示意圖，顯示本發明導光板料之_實施例。 擴散能力之 圖6為本發明_人光結構相較習知人子結構具較佳光 圖7為說明翻入光結構之擴圓柱面執跡示意簡圖。 時2至圖9B為顯示於點光源峨板有效出光區的距離為4.65圆 時，利用不同人光結構而得之光能量模擬分佈圖。 圖贏為顯示本發明_入光結構另一實施例之示音圖。 圖簡為顯示本發明橢圓入光結構另一實施例之示奇圖。 圖η為顯示本發明橢圓人光結構另—實施例之示音圖。 圖12為顯示本發明_人光結構另-實施例之示意圖。 圖13為顯示本發明_人光結構另-實施例之示意圖。 圖14為顯示本發明_人光結構另-實施例之示竟圖。 圖15為—示意圖’顯示本發明導光板設計之另-實施例。 ==至請她入綱外雜例之示意圖。 之說明圖。、發明W型入光結構相較習知入子結構具較佳光擴散能力 14 200903062 圖.至圖μ為顯示於點光源至導光板有效出光區的距離為 4.65_時，利用不同入光結構而得之光能量模擬分佈圖。 圖20為一示意圖，顯示本發明導光板設計之另一實施例。 圖21為一示意圖，顯示本發明導光板設計之另一實施例。 圖22為-不意圖’顯示本發明導光板設計之另—實施例。 圖23為-示意圖，顯示本發明導光板設計之另一實施例。 圖24為本發明之人光結構與習知人光結構之出猶性比較圖。 圖25八至圖MD為顯示本發明橢圓結構外型變化例之示意圖。 圖26為-示意圖’顯示本發明導光板設計之另—實施例。 【主要元件符號說明】 12 ' 32 導光板 12a'32a 入光面 12b、32b 出光面 12c、32c 光反射面 14 發光二極體 16、36 16a 入光結構 橢圓枝面 16b 橢圓頂面 18 V型溝槽 22 導光板側面 36a 桎體侧面 36b 凹陷部 100 背光模組 102 導光板 102a 入光侧面 15 200903062 102b 出光面 102c 底面 104 發光二極體 106 V型溝槽 110 亮帶 112 暗帶 120 V入子結構 122 > 132 入光面 130 R入子結構 130a 正圓弧面 光路徑 C1-C4 ' E1-E4'11-14 ' W1-W4 AR 孤面 R 曲率半徑 Θ 凹入面頂角 δ 分佈角度 16200903062 IX. Description of the Invention: [Technical Field] The present invention relates to a light guide plate having a light-increasing effect and a light-incident structure which can greatly improve light-in efficiency. [Prior Art] A parallel line light source such as a cold cathode fluorescent lamp (CCFL) is relatively unsuitable for use in a small-sized hand-held electronic device because of its large volume. Thus, for example, handheld electronic devices for mobile phones typically use a point source as the side source of their liquid crystal display module. 1 is a schematic diagram showing a conventional backlight module 1 ,, as shown in FIG. 1, for example, a light source of a light-emitting diode (LED) is adjacent to a light guide plate. 102a, and the bottom surface i〇2c of the light guide plate 1〇2 is formed with a meandering structure composed of V-shaped grooves 1〇6. In this conventional design, since the angle of illumination of the point source and the energy relationship follow the Lambert's emission law, the light-emitting diode 104 is used as the side light source of the liquid crystal display module, and is matched with the cymbal (not As shown in Fig. 2, the light is guided to the vicinity of the normal direction of the light-emitting surface 1〇2b of the light guide plate 1〇2, as shown in Fig. 2, the contrasting strong band 11〇 and dark are prone to occur in a local area adjacent to the light-incident side 102a. The band 112 is distributed, and the luminance distribution uniformity of the light guide plate 1〇2 is remarkably reduced. Therefore, in the prior art, a light-incident structure design is proposed to improve the above problem. For example, as shown in FIG. 3, a triangular pillar structure is formed on the light-incident surface 122 to form a v-sub-structure 120, or as shown in FIG. A cylindrical structure is formed on the light incident surface 132 to form a r-sub-structure 130 for light diffusion effect to improve the difference of light/dark band at the light entrance of the light guide plate, and to improve the light-in efficiency of the point light source. However, the conventional V-input structure 12〇 or the sub-structure 13〇 has limited dimming power. Even if these light-incorporating structures are provided, the area of the bright/dark band area where the contrast is strongly distributed on the light guide plate is still quite large, making the whole The uniformity of luminance distribution is still poor and the area of the effective light exit area of the light guide plate cannot be further improved. 200903062 [Summary of the Invention] ^The purpose of the present invention is to provide a good light-expanding effect, and the greater the amount of the light, the more the energy can be added to the tank, and the (10) uniform energy line is connected: at least - a light, a m branch, three people, - The light exit surface, a light reflecting surface, and the matte surface escape ^ are exported. The light reflecting surface is located on the opposite side of the wire to direct the light from the opposite side to the light exiting surface. The light guide plate has an effective light exiting region and a transition region between the light source and the light source, and a plurality of light incident structures are distributed on the light guide plate, and the front side of the incident light is a partial elliptical cylinder surface, and the elliptical cylinder surface The light-increasing thief can provide a better light-input efficiency and an average luminance red area than the conventional light-incident structure, and the phase light state is used to receive at least one light source. The light guide plate that emits the plurality of light into the light includes a light-incident surface, a light-emitting surface, a light-reflecting surface, and a light-emitting surface of the light-receiving surface of the plate, and the light is emitted from the light source: nr remaining __. The illuminating surface is located in the light _ to be used by the effective light exit area and two sides. The light guide plate has an effective light exiting region and a plurality of light incident structures distributed over the light guide plate. Each light knot «The positive of the relatives of the county (four) - = the face pointed to the opposite direction of the concave by the design = (four) light diffusion effect, so you can point the vehicle, to the "ship distance shortened this maintain good brightness evenly Sexuality, obtaining the 200903062 effect of enlarging the effective light-emitting area on the light guide plate' and she knows that the human light structure has better human light efficiency and average brightness. [Embodiment] FIG. 5 is a view showing an embodiment of a light guide plate of the present invention. As shown in FIG. 5, the light guide plate 12 is configured to receive at least the light emitted by the point source (shown as two light-emitting diodes 14) and to form the side of the light guide plate 12 adjacent to the light-emitting diode 14 as _ The light incident surface Ha is formed on the light incident surface 12a, and the top surface of the light incident surface is formed as a light exiting surface (3), and the light emitting surface is formed on the bottom surface of the opposite side to form a light reflecting surface (3). A plurality of 稜鏡 structures composed of V-shaped grooves 8 are distributed on the entire surface of the light reflecting surface & and the long sleeve directions of the respective v-shaped grooves 18 are parallel to each other. After the light emitted from the light-emitting diode 14 enters the light guide plate U through the light-incident surface 12 & the light-reflecting surface 12c then guides the light traveling inside the light guide plate 12 to the light-emitting surface (3), and finally the light exits the light guide plate 12 via the light-emitting surface 12b. . According to the design of the embodiment, the human filament 12a is formed with a plurality of side human light structures, and each of the surface light-incorporating structures 1 "long-term financial direction parallel to each other" is on the human wire i2a, and the distribution area thereof covers at least the respective light-emitting diodes. 14 is a schematic projection area on the light-incident surface 12a. The rounded-in light-emitting structure 16 faces the front side of the human light, and is a partial-side cylindrical shirt, and the top φ 16b of the elliptical light-incident structure 16 has a partial elliptical shape. Explain that the rounded light structure 16 is more conventional: r enters the substructure with better light diffusing ability. As shown in Fig. 6, the human light (4) encounters the positive arc surface 13〇a of the r substructure The path of travel is path Cm (dotted line part). Another incident light of Yang (4) is obeyed by an elliptical cylinder with an elliptical human light structure. The path of travel after the deflection is the road 12El' solid line.) by comparing the path C1_C4 The offset distance of the 彳 is compared with the path E1-E4 and the offset distance of the path n_M. It can be clearly seen that the inherent geometric shape of the side cylinder (6) can bring about an effect of increasing the distance of the human hair, which means that the side is strong. Structure 16's light training ability _ better. Shame, according to the design of this embodiment, as shown in Figure 7, _ column The 16a trajectory follows the equation (χ2/αν(Υγ) = i (where α is the long axis and 10,000 fi 200903062 is the short axis '· α). Furthermore, the point at which the elliptical cylinder 16a is farthest from the smooth surface p The distance from the light-incident surface 12a is set to be larger than the distance between the ends of the elliptical cylinder (four) and the end of the smooth surface m, and the light is diffused. Please refer to FIG. 5 for the point light source. In the environment of the side light source, the light guide plate can be divided into an effective output zone and a transition zone, and the transition zone is adjacent to the county, and the contrast is strong/dark than the cloth. The dense tree (4) becomes a white area. In the New Zealand _ ΕΑ towel, @纽 has expanded the car... so it can be superimposed - the effective age area of the liquid crystal display panel (the ΑΑ area) as the actual secret domain of providing the system. For example, when the distance between the light-emitting diode and the effective light-emitting area μ is secret, the difference between the brightness of the light-emitting diode at the front end of the light-guide plate is 5 coffee 2, which is = = Γ value, if the difference between the brightness of the light/dark band at the front end of the light guide plate is greater than the brightness, the brightness uniformity is not good. = (4), will increase the value of _ _ _ (four). Therefore, with the sewing thread of this real _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The brightness uniformity (brightness 乃^ is less than the critical value) 'obtained to increase the light guide plate __ Μ2 2 Figure 8Α to Fig. 9Β is shown in the point source to the field left > the fruit, using different human light structures The light energy has; 1 the distance of the light exiting area is 4.65 surface ^ π in the virtual distribution map. Comparing Fig. 8 and Fig. 8B, the peak of Fig. 8B is flat trapezoidal and Fig. 8 and Fig. 8B can be elliptical into the light structure 16 Compared with the conventional knowledge/peak: the second (four) of the money, it can be seen that the same comparison of FIG. 9A and FIG. 9B shows that the structure has a better light-expanding capability. A sharp triangle, the rounding of Fig. 9B can be seen, and the peak substructure of Fig. 9 has a better light-expanding ability π. This is because the conventional structure of Fig. 9A makes the transition zone TA. The area is reduced, in other words, the structure 16 has an excellent effect of light diffusion efficiency EA area. Please add a large towel § increase the effective light-emitting area of the light guide plate 200903062 According to the design of this embodiment, the elliptical light-incident structure 16 only needs to be set in the transition zone, and it can be placed on the guide 12 and the age-aged Secret. For example, the elliptical light-incident structure formed on the light-incident surface 12a does not need to be the same as shown in FIG. 5, and the two adjacent elliptical light-incidents formed on the light-incident surface 12a may be formed as in J0A. Structure 16 has different dimensions. In addition, as shown in the figure, the rounded-in light structure Μ may be a recessed structure formed on the light-incident surface (2) and disposed inside the light guide plate 12, and is not limited to the plane of the V-plate. The bumps are on. Furthermore, the facial human light structure 16 is not limited to being formed on the human light surface 12a. For example, as shown by gjn, a plurality of grooved ages are formed in the transition zone TA. As shown in FIG. 12, the elliptical light-incident structure 16 is simultaneously formed on the light-incident surface &2& and in the transition region TA except the light-incident surface to further enhance the light diffusion effect. Furthermore, in the embodiment shown in FIG. n, the elliptical cylinder surface of the elliptical light-incident structure 16 formed on the light-incident surface 12a is directed toward the light-emitting diode 14' and is formed in the transition region TA except the light-emitting surface. The marriage light structure 16 has an elliptical cylinder pointing away from the light-emitting diode 14, but this configuration is not limited, and the actual light diffusion effect can be arbitrarily changed. Figure 13 is a schematic view showing another embodiment of the present invention. As shown in Fig. 13, in the case of using a single light-emitting diode Μ as a side light source, the light-emitting diode w can be placed adjacent to the corner of the light guide plate 2. The p portion and the corner portion of the light guide plate 12 form a cross section to distribute the elliptical light into the light structure 16 and serve as the light incident surface 12a. Furthermore, the side surface 22 of the light guide plate adjacent to the light incident surface 12a may be a flat surface as shown in FIG. 13 or a curved surface as shown in FIG. Figure 15 is a schematic view showing another embodiment of the w-shaped light-incident structure of the present invention. According to the embodiment of the present invention, the reflecting surface 32c of the light guiding plate 32 is distributed with a plurality of 稜鏡 structures formed by the v-shaped grooves 18, and a plurality of light-emitting surfaces of the light guiding plate 32 are formed. w type into the light,. Structure 36. Each of the W-type light-incident structures 36 is arranged on the light-incident surface 200903062a in such a manner that the long-axis directions are parallel to each other, and the distribution area thereof at least covers a region in which the respective light-emitting diodes are bound to the light-incident surface. The front side of the w-shaped human light structure 36 is a field side shirt, the side of the cylinder is applied as a curved surface, and the curved surface has at least one concave portion 36b that is concave toward the opposite surface in the opposite direction, so that the entire Light structure 36 exhibits a w-shaped appearance. The shape of the side surface a of the cylinder only needs to be a curved surface, such as a surface (10), an elliptical cylinder (a figure), or an isolated surface having a non-fixed curvature (Fig. 16A), and a depression recessed in the opposite direction. The shape of the cross-section is not limited, and may be, for example, a _ shape (Fig. 16 Α, 图 )), a triangle (Fig. 6 Β, a cell), or a circle (Fig. 16C, Fig. 16F). In the present embodiment, when the side surface 3 of the cylinder is known as a cylindrical side surface, the radius of curvature of the side surface of the cylinder is preferably to the surface (four). When the side surface 36a of the cylinder is a marriage surface, the surface of the cylinder and the entrance surface are The maximum distance is preferably less than the intercept of the intersection of the circular surface and the incident surface. Further, as shown in Fig. _ and Fig., when the recessed portion 36b has a triangular concave surface design, the apex angle of the concave surface is preferably in the range of 2 to 150 degrees. FIG. 2 is an explanatory view showing that the W-type light incident structure 36 has better light diffusing ability than the conventional R input substructure. As shown in FIG. 17, since the w-type human light structure 36 has 1 trapping portion, the incident light 11-13 encounters a large deviation of the boundary surface of the recessed portion 36b, meaning that the light path is lying. The light path of the fe section; ^ C1_C3 has a large offset distance. Therefore, the W-shaped human light structure 36 having the depressed portion has a good _ light effect, so that the distance from the point source to the effective light exit region can be reduced without making the difference between the brightness and the darkness of the front end of the light guide plate exceed the critical value. The effect of the effective light-emitting area EA area of the zero plate. 18A to 19B are diagrams showing the distribution of light energy obtained by using different light incident structures when the distance from the point source to the effective light exiting region of the t-light plate is 465 rnm. 18A and 18B, the peak of Fig. 18B has a flat trapezoidal shape and the peak of f 18A has a sharp triangular shape. The _18_W type human light structure 36 has a better light-expanding ability than the V-input structure. Similarly, as shown in FIG. 19A and FIG. 19B, the peak of FIG. 19B is a flat trapezoid and the peak of the muscle of the figure is sharply triangular. It can be seen that the 200903062 substructure of the map has a better light-expanding ability. The w-type light-inducing structure 36 of this example is applicable to the change of the arrangement and distribution of the human light structure 16. The biasing w, white is applied to the light surface 32a and toward the light guide plate 32: the structure 36 may be a convex block formed outside the plane _ 15); = 2 〇), or protruded from the light guide plate only formed in addition to the The light-incident surface 32a may be formed outside the light-incident surface, or may be formed on the light-incident surface, or may be formed in the transition region TA of the light-incident surface 32a. In addition, as shown in FIG. 2A and FIG. 21, when the I structure 36 is matched with the early-point wire, the point light source can also be disposed adjacent to the light guide plate and can also form an elliptical light-incident structure 16 on the light-incident surface. A W-type human light structure % is formed in the transition region TA other than the light incident surface. Alternatively, a %-shaped nose can be formed on the light-incident surface to form an elliptical human light structure 16 in the transition region TA other than the human light surface. The design of the elliptical light-in structure 16 or the w-type light-inducing structure 36 of the present invention can also be combined with the light guide plate of the R-in or V-sub-structure to improve the graded fruit. As a general rule, as shown in Fig. 22, the V-person structure 120 is formed on the human face, and the w-type light-incident structure % is formed in the transition region TA except the person's glossy surface. Alternatively, as shown in the figure, the incident light, the /^/ into the sub-structure 120, and the elliptical light, ', and 16' are formed in the transition region τα except the light incident surface. In addition, in the transition region TA, only one W-type light-inducing structure 36 or an elliptical light-into-light structure 16 may be disposed corresponding to each of the light-emitting diodes 51, or may be arranged in a horizontal position corresponding to each of the light-emitting diodes 14 A plurality of w-type light-inducing structures 36 or sugar-into-light structures 16 are listed. Figure 24 shows the numerical values obtained by the inventors actually simulating the light-emitting characteristics of the present invention and conventional light-incorporating structures. Under the same conditions, after the incident light emitted by the point source is diffused through the elliptical light-incorporating structure 16, the linear/distance band luminance of the front end of the light guide plate is reduced to 2.5 mm when the linear distance from the spot light source to the effective light-emitting area is reduced to 2.5 mm. /m2, this value is within the critical range, and the total optical radiation flux is 〇.1 u W, and the average luminance is 74.52 cd/m2. Therefore, the elliptical light-increasing structure 16 of the present invention can shorten the linear distance from the point source to the effective light-emitting area (reduced shrinkage), compared to the conventional 12 200903062. The effective light-emitting area is increased by 5 57%), and the luminous efficiency of the person can be greatly improved. 2) The average brightness (up 14.78%). On the other hand, when the light emitted by the point source is dimmed by W-type 36, when the linear distance from the point source to the effective light-emitting area is reduced to 2 5, the difference between the full-brightness of the guide and the reflection is 6 , this value is in the critical side, and the total luminous flux is 〇.113 W 'the average luminance is 75 m2. Therefore, the w type of the present invention = structure 36, she is not able to check the line to the effective exit line, away from the (reduction test), increase the effective light-emitting area (increase 5 57%), and can greatly improve the 21.62〇/〇)^^#^(^ 14.78〇/〇)〇, i and the average from the structure 36, her sacred light structure 16 can be further improved, and the light-increasing effect is designed according to the invention. Structure 16, need not be as shown in Figure 7, ellipse ★ face (10) has a complete compliance with the equation (Caf 2) + (the =1 of the trace, but only and has a substantially elliptical trajectory, that can get the invention For example, Lu, elliptical cylinder 16a scoop 3 ° "positive ellipse ^ of the obstruction section and part of the full circle of the trajectory 11 (Fig. 25A), while 25B ^ 25C). « The elliptical slave constitutes an approximate ellipse (Fig. 25D) and the like can be changed. On the other surface, the elliptical light-incident structure 16 is formed on the flat-gloss surface AR 26, and the _ human light structure 16 can also be formed on an arc. The radius of curvature of the orphan plane AR is good. .3_至i 2聪: The distribution angle of the structure 16 on the fox face AR is such that the twist is up to (10) degrees·, and preferably 7 degrees is 50 degrees, and the elliptical main faces of the circular human light structure 16 have different lengths. The ratio of two/5' and the length to the minor axis P is preferably (2) to 丨... ', and the above is merely an example 'not'. It is not limited to the formation of a V-shaped groove; for example, on the reflective surface of the light guide plate, it is also possible to form any of the 13 200903062 light guiding microstructures, such as curved structures, only need Nin Lin will take advantage of the spirit and scope of the invention, and the equivalent modification or change I shall be included in the scope of the appended patent application, not limited to the above. An embodiment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a conventional backlight module. Fig. 2 is a schematic view showing the distribution of light/dark bands of an m-light plate. Fig. 3 is a view showing a conventional light-incident structure. Fig. 4 is a schematic view showing another conventional light incident structure. Figure 5 is a schematic view showing an embodiment of the light guide sheet of the present invention. Fig. 6 is a schematic diagram of the present invention. The human light structure has a better light than the conventional human structure. Fig. 7 is a schematic diagram showing the extended cylindrical surface of the turned-in light structure. From time 2 to FIG. 9B, the light energy simulation distribution map obtained by using different human light structures when the distance of the effective light exiting region of the point light source plate is 4.65 circles is shown. The figure wins is a sound map showing another embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram showing another embodiment of the elliptical light-incident structure of the present invention. Figure η is a sound diagram showing another embodiment of the elliptical human light structure of the present invention. Figure 12 is a schematic view showing another embodiment of the present invention. Figure 13 is a schematic view showing another embodiment of the present invention. Fig. 14 is a view showing the other embodiment of the present invention. Figure 15 is a schematic view showing another embodiment of the light guide plate design of the present invention. == To ask her to enter the outline of the exception. Description of the figure. Inventing the W-type light-inducing structure has better light-diffusing capability than the conventional-incorporated structure. 14 200903062 Fig. to Figure μ shows the distance between the point source and the effective light-emitting area of the light guide plate is 4.65 _, using different light-input structures And the light energy simulation map. Figure 20 is a schematic view showing another embodiment of the design of the light guide plate of the present invention. Figure 21 is a schematic view showing another embodiment of the design of the light guide plate of the present invention. Fig. 22 is a view showing another embodiment of the light guide plate design of the present invention. Figure 23 is a schematic view showing another embodiment of the design of the light guide plate of the present invention. Figure 24 is a comparison diagram of the human light structure of the present invention and the conventional human light structure. Fig. 25 to Fig. MD are schematic views showing variations of the appearance of the elliptical structure of the present invention. Figure 26 is a schematic view showing another embodiment of the design of the light guide plate of the present invention. [Description of main component symbols] 12 '32 Light guide plate 12a'32a Light-incident surface 12b, 32b Light-emitting surface 12c, 32c Light-reflecting surface 14 Light-emitting diode 16, 36 16a Light-emitting structure Elliptical surface 16b Elliptical top surface 18 V-type Groove 22 Light guide plate side 36a Carcass side 36b Depression 100 Backlight module 102 Light guide plate 102a Light-incident side 15 200903062 102b Light-emitting surface 102c Bottom surface 104 Light-emitting diode 106 V-shaped groove 110 Bright band 112 Dark band 120 V Substructure 122 > 132 Light entrance surface 130 R into substructure 130a Positive circular surface light path C1-C4 ' E1-E4'11-14 ' W1-W4 AR orphan plane R Curvature radius 凹 Concave plane apex angle δ distribution Angle 16