201122583 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種導光板以及背光模組，尤其涉及一種適 用於直下式背光模組的導光板以及直下式背光模組。 【先前技術】 [0002] 近年來，平面顯示器發展迅速，已被廣泛應用於個人電 腦、電視、移動通訊及消費性電子產品等領域。同時， 電子產品對平面顯示裝置（如液晶顯示裝置）的要求不斷 提高。背光模組為顯示裝置中的重要元件，其將點光源 或線光源發出的光通過導光板的散射後形成一面光源， 所以設計各種背光模組成為目前的時究熱點。 [0003] 背光模組通常包括光源與導先板，導光板引導從光源發 出的光束之傳輸方向’將線光源或點光源轉換成面光源 。按照光源放置位置之不同，背光模組可分為直下式及 側置式兩類。直下式背光模組係指將光源置於導光板正 下方，直接照明。而側置式背光模組一般將光源置於導 Q 光板的側面，光線由側面耦合入導光板，於導光板内形 成全反射並不斷向前傳播。藉由對全反射條件之破壞， 實現導光板出光面均勻射出光線。因此，導光板的結構 對背光模組之出光效果有重要的影響。 [0004] 先前技術提供一種背光模組，該背光模組包括一導光板 ，一反射膜和一發光二極體’該導光板包括一底面，一 與該底面相對之出光面。該發光二極體設置於所述導光 板底面一侧。所述出光面對應發光二極體設置有微結構 ’該底面上設置有複數散射網點。該反射膜設置於所迷 098143541 表單編號A0101 第3頁/共24頁 〇982〇74594、〇 201122583 導光板底面一側。由該發光二極體出射之光線入射導光 板内部之後在出光面的表面具有不同之入射角度，一部 份光線於出光面之表面折射後由該出光面射出，另一部 份光線於出光面的表面反射後經由反射膜及所述底面上 之複數散射網點再由出光面射出，即該微結構會消弱所 述導光板出光面之與發光二極體對應區域的光線分佈。 [0005] [0006] [0007] 098143541 然而，發光二極體光源為點光源，所述出光面上與該發 光二極體對應區域較其他區域光照射強度強，並且照射 在與該發光二極體對應區域即微結構表面強度較強之光 線產生折射後直接由此出射，即出光面的微結構的部份 區域還有較強光出射，光線分佈還係較集中，所以導光 板與發光二極體對應的區域出射光之均勻性較差，無法 實現直下式背光模組整體均勻出光。 【發明内容】 有鑒於此，提供一種可提高直下式背光模組出光均勻性 之導光板及直下式背光模組，以解決上述技術問題實為 必要。 一種導光板，其包括：一底面，一與該底面相對之出光 面及連接所述底面和所述出光面之側面，所述出光面包 括至少一凹面，該至少一凹面包括光線入射角度大於導 光板全反射臨界角之第一區域與光線入射角度小於導光 板全反射臨界角之第二區域，該第二區域設置有反射結 構。 一種背光模組，其包括：一導光板，該導光板包括一底 面、一與該底面相對之出光面及連接所述底面和所述出 表單編號A0101 第4頁/共24頁 0982074594-0 [0008] 201122583 [0009] Ο Ο [0010] [0011] 光面之側面，所述出光面包括至少一凹面；以及至少一 光源，所述光源設置於所述導光板底面一側，並與出光 面之凹面相對，該光源與凹面一對一或複數個對一對應 ，其中，該至少一凹面包括光線入射角度大於導光板全 反射臨界角之第一區域與光線入射角度小於導光板全反 射臨界角之第二區域，該第二區域設置有反射結構。 相對於先前技術，所述導光板出光面對應光源設置有凹 面，且由入射角度之大小將所述凹面分為二區域，即光 線入射角度大於導光板全反射臨界角之第一區域與光線 入射角度小於導光板全反射臨界角之第二區域，並僅於 入射角度小於導光板全反射臨界角之第二區域設置反射 結構，即凹面上沒有強光直接出射。所以，曼有效地削 弱出光面之與光源對應的區域之光線分佈，同時更有效 地增加出光面與光源相對應之區域的週邊區域之光線分 佈，使由導光板出射之光線更加均勻，進而背光模組具 有較為均一的發光亮度。另外，節省設置反射結構之製 造工藝及材料。 【實施方式】 以下將結合附圖詳細說明本發明實施方式提供的背光模 組以及液晶顯示器。 請參閱圖1，本發明第一實施方式提供一種背光模組2〇 , 其包括光源200、導光板202、反射膜204、微棱鏡系統 206、偏振轉換系統2〇8以及散射板21〇。該反射膜2〇4、 導光板202、微棱鏡系統206、偏振轉換系統208以及散 射板210依次層疊設置。所述光源2〇〇設置於所述導光板 098143541 表單編號Α0101 第5頁/共24頁 0982074594-0 201122583 202—侧，由該光源200出射之光線經由導光板2〇2、微 棱鏡系統2 0 6、偏振轉換系統2 0 8以及散射板21 0直接出 射或由該光源200出射之光線於導光板2〇2内部產生反射 後再被反射膜204反射經由導光板202、微棱鏡系統206 、偏振轉換系統208以及散射板21〇後出射。 [0012] 所述導光板202包括一底面212，一與該底面212相對的 出光面214以及連接所述底面212和出光面214之側面216 ’且所述底面212包括一中心218及圍繞該中心設置的複 數散射網點220，所述出光面214具有一凹面222。所述 導光板202為一圓形、方形、矩形或其他多邊形之透明基 板。所述透明基板之材料可為工程塑料、聚甲基丙烯酸 甲酯（PMMA)或玻璃等。該導光板202:的厚夜不限，可根 據實際情況選擇。本實施方式中’導光板202係邊長為50 毫米之方形PMMA基板’其具一垂直於該出光面之中心軸 〇 [0013] 所述光源200為一點光源，如：螢光燈或發光二極體（ LED)等。本實施方式中，所述光源200為單色發光二極 體。 [0014] 該微棱鏡系統206可為透射式增光膜或反射式增光膜，用 以將從導光板202射出之光進行有效調整，使得導光板 202射出之光線在整體上具一定集中度’從而調整導光板 202射出光線之整體亮度。所述偏振轉換系統208設置於 微棱鏡系統206上，且設置於微棱鏡系統206之遠離出光 面214的一側。該偏振轉換系統2 0 8根據光線之偏振方向 用於控制、調整光線之傳播。所述散射板210設置於偏振 098143541 表單編號A0101 第6頁/共24頁 201122583 轉換系統208上，且設置於偏振轉換系統208之遠離出光 面214的一側。該散射板210用於將從出光面214射出之 光線進一步分散和均勻化。可以理解，該微棱鏡系統2〇6 、偏振轉換系統208以及散射板210為一可選擇結構。 [0015] Ο [0016] 所述光源200設置於該導光板202正下方之與底面中心 218相對的位置。所述反射膜204設置於該導光板202之 底面212 ’其與該光源2〇〇對應之處具有光穿透部（未標 示），即所述光穿透部可為反射膜204上形成之空心或透 明膜。所述微棱鏡系統206、偏振轉換系統208以及散射 板210依次設置於導光板2〇2之出光面214—側。 所述導光板202的散射網點220可為凸點、的槽或凸點與 凹槽之組合。所述散射網點220之形狀包括錐體、長方體 、立方體、橢球、圓球及半圓球中之一種或複數種。所 述散射網點220的粒徑可為〇· 1毫米〜0. 5毫米。所述散射 網點2 2 0的材料為油墨、鈦系化合物或石夕系化合物。 [0017] Ο 所述凹面222設置於導光板202出光面214之與底面212中 心218相對應之位置，且凹入導光板2〇2内部。該凹面 222可為一半球面、圓錐面或類圓錐面等。所述凹面 包括一第一區域224及一第二區域226。於所述第一區域 224上光線入射角度大於全反射臨界角度，於所述第一區 域226上光線入射角度小於全反射臨界角度。該第二區域 226設置有反射結構228，所述反射結構228可為反射膜 、通過腐蝕形成的複數微結構或反射填充物。所述凹面201122583 VI. Description of the Invention: [Technical Field] The present invention relates to a light guide plate and a backlight module, and more particularly to a light guide plate and a direct type backlight module suitable for a direct type backlight module. [Prior Art] [0002] In recent years, flat panel displays have been rapidly developed and have been widely used in personal computers, televisions, mobile communications, and consumer electronic products. At the same time, electronic products are increasingly demanding flat display devices such as liquid crystal display devices. The backlight module is an important component in the display device. The light emitted by the point source or the line source is scattered by the light guide plate to form a light source. Therefore, designing various backlight modules has become a hot spot. [0003] A backlight module generally includes a light source and a guiding plate that guides a direction of transmission of a light beam emitted from a light source to convert a line source or a point source into a surface source. According to the position of the light source, the backlight module can be divided into two types: direct type and side type. The direct-lit backlight module refers to direct illumination of the light source directly under the light guide plate. The side-mounted backlight module generally places the light source on the side of the light-guide plate, and the light is coupled into the light guide plate from the side, and forms a total reflection in the light guide plate and continuously propagates forward. The light exiting the light-emitting surface of the light guide plate uniformly emits light by destroying the total reflection condition. Therefore, the structure of the light guide plate has an important influence on the light-emitting effect of the backlight module. The prior art provides a backlight module including a light guide plate, a reflective film, and a light emitting diode. The light guide plate includes a bottom surface and a light emitting surface opposite to the bottom surface. The light emitting diode is disposed on a side of the bottom surface of the light guide plate. The light-emitting surface is provided with a microstructure corresponding to the light-emitting diode. The bottom surface is provided with a plurality of scattering dots. The reflective film is disposed on the bottom side of the light guide plate. 098143541 Form No. A0101 Page 3 of 24 〇982〇74594, 〇 201122583 The bottom side of the light guide plate. The light emitted by the light-emitting diode enters the interior of the light guide plate and has different incident angles on the surface of the light-emitting surface. A part of the light is refracted on the surface of the light-emitting surface, and is emitted from the light-emitting surface, and the other portion of the light is emitted from the light-emitting surface. After the surface is reflected, the reflective film and the plurality of scattering dots on the bottom surface are further emitted from the light-emitting surface, that is, the microstructure weakens the light distribution of the light-emitting surface of the light guide plate and the corresponding region of the light-emitting diode. [0006] [0007] 098143541 However, the light-emitting diode light source is a point light source, and the corresponding area of the light-emitting surface and the light-emitting diode is stronger than other areas, and is irradiated with the light-emitting diode The corresponding area of the body, that is, the light with strong surface intensity of the microstructure is refracted and directly emitted therefrom, that is, part of the microstructure of the light-emitting surface is also emitted by strong light, and the light distribution is concentrated, so the light guide plate and the light-emitting layer are The uniformity of the outgoing light in the region corresponding to the polar body is poor, and the uniform illumination of the direct-lit backlight module cannot be achieved. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a light guide plate and a direct type backlight module that can improve the uniformity of light emission of a direct type backlight module, so as to solve the above technical problems. A light guide plate includes: a bottom surface, a light emitting surface opposite to the bottom surface; and a side surface connecting the bottom surface and the light emitting surface, wherein the light emitting surface comprises at least one concave surface, wherein the at least one concave surface comprises a light incident angle greater than a guide The first region of the critical angle of the total reflection of the light panel and the second region of the light incident angle smaller than the critical angle of the total reflection of the light guide plate, the second region being provided with a reflective structure. A backlight module includes: a light guide plate, the light guide plate includes a bottom surface, a light exit surface opposite to the bottom surface, and the bottom surface and the exit form number A0101 page 4 / total 24 pages 0982074594-0 [ [0011] [0011] [0011] [0011] [0011] [0011] The side of the smooth surface, the light-emitting surface includes at least one concave surface; and at least one light source, the light source is disposed on a side of the bottom surface of the light guide plate, and the light-emitting surface The light source is opposite to the concave surface, and the light source has a one-to-one or a plurality of one-to-one correspondence with the concave surface, wherein the at least one concave surface comprises a first region where the incident angle of the light is greater than a critical angle of total reflection of the light guide plate and the incident angle of the light is smaller than a critical angle of the total reflection of the light guide plate a second region, the second region being provided with a reflective structure. Compared with the prior art, the light-emitting surface of the light guide plate is provided with a concave surface corresponding to the light source, and the concave surface is divided into two regions by the incident angle, that is, the first region where the light incident angle is larger than the critical angle of the total reflection of the light guide plate and the light incident. The angle is smaller than the second region of the critical angle of total reflection of the light guide plate, and the reflective structure is disposed only in the second region where the incident angle is smaller than the critical angle of total reflection of the light guide plate, that is, no strong light is directly emitted from the concave surface. Therefore, Man effectively weakens the light distribution of the light-emitting area corresponding to the light source, and more effectively increases the light distribution of the peripheral area of the light-emitting surface corresponding to the light source, so that the light emitted by the light guide plate is more uniform, and thus the backlight The module has a relatively uniform brightness of illumination. In addition, the manufacturing process and materials for setting the reflective structure are saved. [Embodiment] Hereinafter, a backlight module and a liquid crystal display according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. Referring to FIG. 1, a first embodiment of the present invention provides a backlight module 2A including a light source 200, a light guide plate 202, a reflective film 204, a microprism system 206, a polarization conversion system 2〇8, and a diffusion plate 21〇. The reflection film 2〇4, the light guide plate 202, the microprism system 206, the polarization conversion system 208, and the diffusion plate 210 are laminated in this order. The light source 2 is disposed on the side of the light guide plate 098143541, form number Α0101, page 5 / page 24, 0982074594-0 201122583 202, and the light emitted by the light source 200 passes through the light guide plate 2, and the microprism system 2 0 6. The polarization conversion system 208 and the scatter plate 21 0 directly emit light or the light emitted by the light source 200 is reflected inside the light guide plate 2 〇 2 and then reflected by the reflection film 204 via the light guide plate 202 , the microprism system 206 , and the polarization. The conversion system 208 and the diffuser plate 21 are then ejected. [0012] The light guide plate 202 includes a bottom surface 212, a light exit surface 214 opposite to the bottom surface 212, and a side surface 216' connecting the bottom surface 212 and the light exit surface 214. The bottom surface 212 includes a center 218 and surrounds the center. A plurality of scattering dots 220 are disposed, and the light emitting surface 214 has a concave surface 222. The light guide plate 202 is a circular, square, rectangular or other polygonal transparent substrate. The material of the transparent substrate may be an engineering plastic, polymethyl methacrylate (PMMA) or glass. The light guide plate 202: is not limited to a thick night, and can be selected according to actual conditions. In the present embodiment, the light guide plate 202 is a square PMMA substrate having a side length of 50 mm. It has a central axis perpendicular to the light exit surface. [0013] The light source 200 is a light source such as a fluorescent lamp or a light emitting device. Polar body (LED), etc. In the present embodiment, the light source 200 is a monochromatic light-emitting diode. [0014] The microprism system 206 can be a transmissive brightness enhancement film or a reflective brightness enhancement film for effectively adjusting the light emitted from the light guide plate 202 so that the light emitted from the light guide plate 202 has a certain concentration as a whole. The overall brightness of the light emitted by the light guide plate 202 is adjusted. The polarization conversion system 208 is disposed on the microprism system 206 and disposed on a side of the microprism system 206 that is remote from the light exit surface 214. The polarization conversion system 208 is used to control and adjust the propagation of light according to the polarization direction of the light. The scatter plate 210 is disposed on the polarization system 098143541 Form No. A0101, page 6 of 24, 201122583 conversion system 208, and is disposed on a side of the polarization conversion system 208 that is remote from the light exit surface 214. The diffusing plate 210 is for further dispersing and homogenizing the light emitted from the light exit surface 214. It will be appreciated that the microprism system 2〇6, the polarization conversion system 208, and the diffuser plate 210 are an alternative configuration. [0015] The light source 200 is disposed at a position opposite to the bottom center 218 directly below the light guide plate 202. The reflective film 204 is disposed on the bottom surface 212 ′ of the light guide plate 202 and has a light penetrating portion (not labeled) corresponding to the light source 2 , that is, the light penetrating portion may be formed on the reflective film 204 . Hollow or transparent film. The microprism system 206, the polarization conversion system 208, and the scattering plate 210 are sequentially disposed on the light-emitting surface 214 side of the light guide plate 2〇2. The scattering dots 220 of the light guide plate 202 may be bumps, grooves or a combination of bumps and grooves. The shape of the scattering dot 220 includes one or a plurality of cones, cuboids, cubes, ellipsoids, spheres, and semi-spherical spheres. 5毫米。 The particle size of the scattering dot point may be 〇 1 mm ~ 0. 5 mm. The material of the scattering dot 2 2 0 is an ink, a titanium compound or a Shishi compound. [0017] The concave surface 222 is disposed at a position corresponding to the center 218 of the bottom surface 212 of the light-emitting surface 214 of the light guide plate 202, and is recessed into the interior of the light guide plate 2〇2. The concave surface 222 may be a semi-spherical surface, a conical surface, or a conical surface. The concave surface includes a first region 224 and a second region 226. The incident angle of the light on the first region 224 is greater than the critical angle of total reflection, and the incident angle of the light on the first region 226 is less than the critical angle of total reflection. The second region 226 is provided with a reflective structure 228, which may be a reflective film, a plurality of microstructures formed by etching, or a reflective filler. Concave surface
222係通過將導光板2〇2之出光面214挖去〜M 、繞導光板202 中心軸旋轉而形成之旋轉體形成。該旋轉 098143541 姐巴括一底圓 表單編號A0101 第7頁/共24頁 0982074594-0 201122583 盤（未標不）及一頂點（未標示），其具有垂直於所述底圓 盤且貫穿所述頂點之中心線，所述底圓盤半徑若設定為R ’則其最優選的滿足以下關係式：R = H*tari0c，Η為導 光板202厚度’ 6^係導光板202的全反射臨界角度。其中 ’如上所述導光板202選用ΡΜΜΑ材料時，所述導光板202 之全反射臨界角度6>c已定，即42度。所述導光板202厚 度Η優選的為5miii。即可計算出所述凹面222於該出光面 214上之底圓盤半徑R值為4· 5mm。可以理解，所述凹面 222於該出光面214上之底圓盤半徑r滿足關係式R=H* tan 6^時，所述出光面214的除凹面222以外之區域上， 由光源200出射之光線的入射角度大於全反射臨界角度。 [0018] 本實施方式中，所述凹面222為圓錐面，其所述中心線與 所述導光板202之中心軸相重疊。該圓錐形凹面222之第 一區域224及第二區域226的個數分別為一，並且所述第 一區域224及第二區域226之連接處形成一圓環形全反射 臨界帶（未標示）。該圓環形全反射臨界帶之半徑若設定 為1^，則其滿足以下關係式：Rf= (h-H) * ( smct cos0 〇c ’ h為圓錐形凹面222於所述中心線上之深度，α係圓錐 形凹面222的錐角。所述圓錐形凹面222之深度h應該滿足 以下條件：〇<h<H ;所述圓錐形凹面222之錐角α滿足 以下關係式：a=tan_1 (R/h)。圓錐形凹面222之深度 h優選的為2_，此時可計算得到Rf = i . 247 mm。 [0019] 本實施方式的背光模組20工作時，點光源2〇〇發出之光束 098143541 表單編號A0101 第8頁/共24頁 0982074594-0 201122583The 222 is formed by digging the light-emitting surface 214 of the light guide plate 2〇2 to a rotating body formed by rotating the center axis of the light guide plate 202. The rotation 098,143,541 includes a bottom circle form number A0101, page 7 / total 24 pages 0982074594-0 201122583 disk (not labeled) and a vertex (not labeled) having a perpendicular to the bottom disk and extending through the The center line of the apex, if the radius of the bottom disk is set to R ', it most preferably satisfies the following relationship: R = H * tari0c, Η is the thickness of the light guide plate 202 6 6 is the total reflection critical angle of the light guide plate 202 . When the light guide plate 202 is selected from the above materials, the total reflection critical angle 6 > c of the light guide plate 202 is set to be 42 degrees. The thickness Η of the light guide plate 202 is preferably 5 miii. The radius R of the bottom disk of the concave surface 222 on the light-emitting surface 214 is calculated to be 4.5 mm. It can be understood that when the radius r of the concave surface 222 on the light-emitting surface 214 satisfies the relationship of R=H* tan 6^, the light-emitting surface 214 is emitted by the light source 200 in a region other than the concave surface 222. The angle of incidence of the light is greater than the critical angle of total reflection. In the present embodiment, the concave surface 222 is a conical surface, and the center line overlaps with a central axis of the light guide plate 202. The number of the first region 224 and the second region 226 of the conical concave surface 222 is one, and the junction of the first region 224 and the second region 226 forms a circular total reflection critical band (not labeled). . If the radius of the circular total reflection critical band is set to 1^, it satisfies the following relationship: Rf=(hH)* (smct cos0 〇c 'h is the depth of the conical concave surface 222 on the center line, α The taper angle of the conical concave surface 222. The depth h of the conical concave surface 222 should satisfy the following condition: 〇 <h<H; the taper angle α of the conical concave surface 222 satisfies the following relationship: a=tan_1 (R /h) The depth h of the conical concave surface 222 is preferably 2_, and Rf = i. 247 mm can be calculated. [0019] When the backlight module 20 of the present embodiment is in operation, the light beam emitted by the point source 2 098143541 Form No. A0101 Page 8 of 24 Page 0982074594-0 201122583
GG
[0020] Ο [0021] 098143541 到達出光面214後，入射角度大於全反射臨界角度之一部 份光線於出光面214的凹面222以外之其他區域及凹面 222之第一區域224上產生反射後進入導光板202内部， 入射烏度小於全反射臨界角度之另一部份光線被所述凹 面222第二區域226上設置之反射結構228反射後進入導 光板202内部，如上所述，於出光面214反射後之光束部 份經底面212上設置的反射膜204及散射網點220反射並 散射後再於出光面214產生折射後由該出光面214射出。 即出光面214的與光源200對應之區域的光線分佈會被削 弱，出光面214與光源200相對應之區域的週邊區域的光 線分佈會相應增加’這樣從導光板2〇2_出之光線分佈比 較均勻，從而背光模組20具有較為均一的發光亮度。 可以理解，本實施方式所提供之導光板202並不限應用於 本實施方式所提供之背光模組20中。即該導光板202可根 據實際需要應用於不同結構之背光模組20中，以提高背 光模組20之出光均勻性。 所述導光板202之出光面214對應光源2〇〇設置有凹面222 ，且利用光全反射原理確定凹面222之底圓盤半徑及凹面 222上應設置反射結構228的區域之截止半徑。所以，更 有效地削弱出光面214的與光源2 0 0對應之區域的光線分 佈’同時更有效地增加出光面214與光源2〇〇相對應的區 域之週邊區域的光線分佈’使由導光板2〇2出射之光線更 加均勻，進而背光模組20具有較為均一的發光亮度。另 外，節省設置反射結構2 2 8之製造工藝及材料。 請參閱圖2，本發明第二實施方式提供一種背光模組， 表單编號Α0101 第9頁/共24頁 0982074594-0 [0022] 201122583 其包括光源300、導光板3〇2、反射膜3〇4、微棱鏡系統 306，偏振轉換系統308以及散射板31〇。所述導光板3〇2 包括一底面312，一與該底面31 2相對的出光面314以及 連接所述底面312和出光面314之側面（圖未標），所述 底面312上設有複數散射網點32〇，所述出光面314具有 一凹面322。 [0023] [0024] [0025] 所述背光模組30與本發明第一實施方式提供一種背光模 組20之結構基本相同，其區別在於，所述導光板3〇2底面 312具有一光源容置部318。所述光源3〇〇設置於該光源 容置部318内部。所述反射膜3〇4設置於導光板底面312 侧，且與所述光源容置部318—併形成收容腔體收容所 述光源300。 所述光源容置部318為一凹槽，且該凹槽之内表面可為一 球面、圓錐面或類圓錐面等。所述光源容置部3丨8之形狀 與所述凹面322的形狀可相同或不同。若光源容置部 之於所述凹面322中心線上之深度設定為⑽，則所述圓錐 形凹面322之深度h應遠滿足以下條件：〇〈h〈（jj_ h〇) 。所述光源容置部318藉由將導光板底面31 2挖去一繞導 光板302之中心軸旋轉而形成的旋轉體形成。 請參閱圖3 ’所述光源容置部318與凹面322均可為—挖去 一個由三角形繞導光板302之中心軸旋轉而形成的旋轉體 後形成之結構。 請參閱圖4 ’所述凹面322可為一挖去一個由三角形繞導 光板302之中心轴旋轉而形成的旋轉體後形成之結構，所 098143541 表單編號A0101 第10頁/共24頁 0982074594-0 [0026] 201122583 [0027] 述光源容置部31 8可為一挖去一個由任意曲線繞導光板 302的中心軸旋轉形成之旋轉體後形成的結構。 請參閲圖5，所述凹面322可為一挖去一個由三角形繞導 光板302之中心軸旋轉而形成的旋轉體後形成之結構，所 述光源容置部318可為一挖去一個由梯形繞導光板302之 中心軸旋轉形成的旋轉體後形成之結構。 [0028] 請參閱圖6，所述光源容置部318與凹面322均可為一挖去 一個半球體後形成之結構。 Ο [0029] [0030] 請參閲圖7 ’所述凹面322可為一挖去一個半球體後形成 之結構，所述光源容置部318可為一挖余^個由任意曲線 繞導光板302之中心軸旋轉形成的旋轉體後形成之結構。 本實施方式中，所述光源容置部318為一挖去一個半球體 後所形成的結構，所述凹面322為一挖去一個由三角形繞 導光板302的十心轴旋轉而形成之旋轉體後形成的結構。 [0031] 〇 [0032] 可以理解’本實施方式中將所述光源3〇〇設置於該光源容 置部318内部可進一步減小背光模組3〇之厚度。 本發明所提供之背光模組並不限於上述實施方式所述， 098143541 如圖2至7所示之導光板的所述散射網點可均勻分佈或隨 機分佈。另外，如圖2至7所干 所不之導光板可為僅於出光面 上設置所述散射網點，還 马出先面及底面均設置所述 散射網二當於所述導光板底面與出光面上均設置所述 散射網點時’光束於導弁 ,,^f, &面與出光面之間可複數 0 , 從而使得出光面射出的光更 加均勾。還有，如圖2至7所示 表單編號麵 ^板可均勻區分為複 0982074594-0 201122583 數區域，於每一區域之中心處設置有如第一、二實施方 式所述之凹面等。 [0033] 綜上所述，本發明確已符合發明專利之要件，遂依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施例 ，自不能以此限制本案之申請專利範圍。舉凡習知本案 技藝之人士援依本發明之精神所作之等效修飾或變化， 皆應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 [0034] 圖1為本發明背光模組之第一實施方式的結構示意圖。 [0035] 圖2為本發明背光模組之第二實施方式的結構示意圖。 [0036] 圖3至圖7為本發明背光模組之第二實施方式採用的不同 結構的導光板之結構不意圖。 【主要元件符號說明】 [0037] 背光模組：20、30 [0038] 出光面：214、31 4 [0039] 光源：200、300 [0040] 側面：216 [0041] 導光板：202、302 [0042] 底面中心：2 1 8 [0043] 反射板：204、304 [0044]散射網點：220、320 [0045] [0045] 微棱鏡系統：206、306 098143541 表單編號A0101 第12頁/共24頁 0982074594-0 201122583 [0046] 凹面：222、322 [0047] 偏振轉換系統：208、308 [0048] 第一區域：224 [0049] 散射板：210、310 [0050] 第二區域：226 [0051] 底面：212、312 [0052] 反射結構：228 ❹ [0053] 光源容置部：318 〇 0982074594-0 098143541 表單編號A0101 第13頁/共24頁[0020] 009143541 After reaching the light exit surface 214, a portion of the light having an incident angle greater than a critical angle of the total reflection is reflected in the other region than the concave surface 222 of the light exit surface 214 and the first region 224 of the concave surface 222. Inside the light guide plate 202, another portion of the light having an incident height less than the critical angle of total reflection is reflected by the reflective structure 228 disposed on the second region 226 of the concave surface 222 and enters the inside of the light guide plate 202, as described above, on the light exit surface 214. The reflected beam portion is reflected and scattered by the reflective film 204 and the scattering mesh point 220 provided on the bottom surface 212, and then refracted by the light exit surface 214, and then emitted from the light exit surface 214. That is, the light distribution of the region of the light-emitting surface 214 corresponding to the light source 200 is weakened, and the light distribution of the peripheral region of the light-emitting surface 214 corresponding to the light source 200 is correspondingly increased. Thus, the light distribution from the light guide plate 2〇2_ It is relatively uniform, so that the backlight module 20 has a relatively uniform luminance. It can be understood that the light guide plate 202 provided by the embodiment is not limited to the backlight module 20 provided by the embodiment. That is, the light guide plate 202 can be applied to the backlight module 20 of different structures according to actual needs, so as to improve the light uniformity of the backlight module 20. The light-emitting surface 214 of the light guide plate 202 is provided with a concave surface 222 corresponding to the light source 2, and the radius of the bottom disk of the concave surface 222 and the cut-off radius of the area of the concave surface 222 where the reflective structure 228 is to be disposed are determined by the principle of total light reflection. Therefore, the light distribution of the region of the light-emitting surface 214 corresponding to the light source 200 is more effectively weakened while the light distribution of the peripheral region of the light-emitting surface 214 corresponding to the light source 2A is more effectively increased. The light emitted from 2〇2 is more uniform, and the backlight module 20 has a relatively uniform brightness. In addition, the manufacturing process and materials for providing the reflective structure 2 28 are saved. Referring to FIG. 2, a second embodiment of the present invention provides a backlight module. Form number Α0101, page 9 / total 24 pages 0982074594-0 [0022] 201122583 It includes a light source 300, a light guide plate 3, and a reflective film 3〇 4. Microprism system 306, polarization conversion system 308, and diffusion plate 31A. The light guide plate 3〇2 includes a bottom surface 312, a light exit surface 314 opposite to the bottom surface 31 2, and a side surface (not labeled) connecting the bottom surface 312 and the light exit surface 314. The bottom surface 312 is provided with a plurality of scattering At the dot 32 〇, the light exit surface 314 has a concave surface 322. [0025] The backlight module 30 and the first embodiment of the present invention provide a backlight module 20 having substantially the same structure, and the difference is that the bottom surface 312 of the light guide plate 3 具有 2 has a light source capacity. The portion 318. The light source 3 is disposed inside the light source accommodating portion 318. The reflective film 3〇4 is disposed on the bottom surface 312 of the light guide plate, and forms a receiving cavity with the light source accommodating portion 318 to accommodate the light source 300. The light source accommodating portion 318 is a groove, and the inner surface of the groove may be a spherical surface, a conical surface or a conical surface. The shape of the light source accommodating portion 3 丨 8 may be the same as or different from the shape of the concave surface 322. If the depth of the light source accommodating portion on the center line of the concave surface 322 is set to (10), the depth h of the conical concave surface 322 should far satisfy the following condition: 〇 < h < (jj_ h 〇). The light source accommodating portion 318 is formed by digging a bottom surface of the light guide plate 31 2 to a rotating body formed by rotating a central axis of the light guide plate 302. Referring to Fig. 3, the light source accommodating portion 318 and the concave surface 322 may be formed by dicing a rotating body formed by rotating a triangle around the central axis of the light guide plate 302. Referring to FIG. 4, the concave surface 322 may be a structure formed by digging a rotating body formed by rotating a triangle around the central axis of the light guide plate 302. 098143541 Form No. A0101 Page 10 / Total 24 Page 0982074594-0 [0202] The light source accommodating portion 318 may be a structure formed by digging a rotating body formed by rotating an arbitrary curve around a central axis of the light guide plate 302. Referring to FIG. 5, the concave surface 322 can be a structure formed by digging a rotating body formed by rotating a triangle around the central axis of the light guide plate 302. The light source receiving portion 318 can be dug one by one. A structure formed by rotating a body formed by rotating a central axis of the trapezoidal light guide plate 302. [0028] Referring to FIG. 6, the light source accommodating portion 318 and the concave surface 322 may be formed by digging a hemisphere. [0030] Please refer to FIG. 7 'the concave surface 322 can be a structure formed after a hemisphere is dug, and the light source receiving portion 318 can be a divergent guide light guide plate surrounded by any curve. The structure formed by the rotation of the central axis formed by the rotation of 302. In the embodiment, the light source accommodating portion 318 is a structure formed by digging a hemisphere, and the concave surface 322 is a rotating body formed by digging a ten-axis rotating around the light guide plate 302. The structure formed afterwards. [0032] It can be understood that the light source 3〇〇 is disposed inside the light source accommodating portion 318 in the embodiment to further reduce the thickness of the backlight module 3〇. The backlight module provided by the present invention is not limited to the above embodiment, and the scattering dots of the light guide plate shown in Figures 2 to 7 can be uniformly distributed or randomly distributed. In addition, as shown in FIG. 2 to FIG. 7 , the light guide plate may be disposed on the light-emitting surface only, and the scattering mesh is disposed on both the front surface and the bottom surface of the light guide plate. When the scattering point is set on the upper side, the light beam is guided by the guide beam, and the surface of the ^f, & and the light-emitting surface can be multiplied by 0, so that the light emitted from the light-emitting surface is more evenly hooked. Further, as shown in Figs. 2 to 7, the form numbering plate can be evenly divided into a plurality of areas of 0982074594-0 201122583, and a concave surface as described in the first and second embodiments is provided at the center of each area. [0033] In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS [0034] FIG. 1 is a schematic structural view of a first embodiment of a backlight module of the present invention. 2 is a schematic structural view of a second embodiment of a backlight module of the present invention. 3 to FIG. 7 are schematic diagrams showing the structure of a light guide plate of different structures used in the second embodiment of the backlight module of the present invention. [Main component symbol description] [0037] Backlight module: 20, 30 [0038] Light-emitting surface: 214, 31 4 [0039] Light source: 200, 300 [0040] Side: 216 [0041] Light guide plate: 202, 302 [ 0042] Center of the bottom surface: 2 1 8 [0043] Reflector: 204, 304 [0044] Scattering dots: 220, 320 [0045] Microprism system: 206, 306 098143541 Form No. A0101 Page 12 of 24 0982074594-0 201122583 [0046] Concave: 222, 322 [0047] Polarization conversion system: 208, 308 [0048] First region: 224 [0049] Scattering plate: 210, 310 [0050] Second region: 226 [0051] Bottom surface: 212, 312 [0052] Reflective structure: 228 ❹ [0053] Light source housing: 318 〇0982074594-0 098143541 Form number A0101 Page 13 of 24