201022744 九、發明說明： "【發明所屬之技術領域】 ’ 本發明涉及一種導光板以及使用該導光板之背光模 組，尤其涉及一種適用於侧置式背光模組之導光板以及侧 置式背光模組。 【先前技術】 近年來，平面顯示裝置發展迅速，已被廣泛應用於移 _動通訊及消費性電子產品等領域，例如，數位相機、攝像 機及帶有攝像功能之手機等（請參見Capturing images with digital still cameras, Micro, IEEE Volume:18, issue:6，Nov.-Dec.l998 Page(s):14-19)。同時，電子產品對 平面顯示裝置（如液晶顯示裝置）之要求不斷提高。背光模組 為顯示裝置中之重要元件，其將點光源或線光源發出之光 通過導光板之散射後形成一面光源，故，設計各種背光模 組成為目前之研究熱點。 背光模組通常包括光源與導光板，且光源相對於導光 板之入光面設置。導光板引導從光源發出之光束之傳輸方 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。而侧置 式背光模組一般將光源置於導光板之側面，光線由侧面耦 合入導光板，於導光板内形成全反射並不斷向前傳播。通 過對全反射條件之破壞，實現導光板出光面均勻射出光 201022744 線。由此可見，導光板之結構對背光模組之出光效果有著 重要之影響。 ' 請一併參閱圖1及圖2,先前技術提供一種導光板10， 該導光板10包括一入光面11、一與該入光面11相交之出 光面12、與該出光面12相對之底面13以及與該入光面11 相連之侧面（圖未示）。於導光板10之底面13配置有網點 130，該網點130於導光板10之底面13上等間距分佈。當 光線傳輸至該網點130時，光線改變其反射角度，即破壞 ® 光線傳遞之全反射現象，光線將發生反射與散射，並向各 個不同方向傳輸，最終由該導光板10之出光面12射出。 然，此種結構之導光板10出光不均勻，距離光源較近之導 光板10之出光面12輝度較高，距離光源較遠之導光板10 出光面12輝度較低，所以，該導光板10無法實現光之均 勻出射。 為提高導光板出光面之出光均勻性，如圖3及圖4所 _ 示，2003年7月24日公開之第20030137824號美國專利申 請揭示一種背光模組14，其包括：一長方形導光板15，其 下表面即反射面形成複數間斷分佈之散光凹槽16, 一設置 於該導光板15頂角處之LED光源17，一設置於該導光板 15上方之散射棱鏡片18, 一設置於該導光板15下方之反 射片19，其中，該複數散光凹槽16以光源17為圓心呈圓 弧狀分佈，且相鄰圓弧間隔相等（如圖4所示）。該複數散光 凹槽16可一定程度上改善該背光模組14之出光均勻性， 然，此種結構之導光板15由於散光凹槽16之分佈形狀與 8 201022744 • 導光板15之形狀不匹配，所以該背光模組14之出光仍不 夠均勻’距離光源17較近之導光板15之出光面輝度較高， 距離光源較遠之導光板15之出光面輝度較低，所以，該背 光模組14之出光面出光仍不夠均勻。 【發明内容】201022744 IX, invention description: "[Technical field of invention] The present invention relates to a light guide plate and a backlight module using the same, and more particularly to a light guide plate and a side-mounted backlight module suitable for a side-mounted backlight module group. [Prior Art] In recent years, flat display devices have developed rapidly and have been widely used in mobile communication and consumer electronics, such as digital cameras, video cameras, and mobile phones with camera functions (see Capturing images with Digital still cameras, Micro, IEEE Volume: 18, issue: 6, Nov.-Dec.l998 Page(s): 14-19). 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, and 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 modes is a hot research topic. The backlight module generally includes a light source and a light guide plate, and the light source is disposed opposite to the light incident surface of the light guide plate. The light guide plate guides the transmission direction of the light beam emitted from the light source, and converts the line light source or the point light source into a surface light 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-type 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 by the side surface to form a total reflection in the light guide plate and continuously propagate forward. By destroying the total reflection condition, the light-emitting surface of the light guide plate is uniformly emitted to the line 201022744. It can be seen that the structure of the light guide plate has an important influence on the light-emitting effect of the backlight module. Referring to FIG. 1 and FIG. 2 , the prior art provides a light guide plate 10 , which includes a light incident surface 11 , a light exit surface 12 intersecting the light incident surface 11 , and the light exit surface 12 opposite to the light exit surface 12 . The bottom surface 13 and a side surface (not shown) connected to the light incident surface 11 are shown. The bottom surface 13 of the light guide plate 10 is provided with dots 130 which are equally spaced on the bottom surface 13 of the light guide plate 10. When the light is transmitted to the dot 130, the light changes its reflection angle, that is, the total reflection of the light transmission is broken, the light will be reflected and scattered, and transmitted to different directions, and finally emitted by the light-emitting surface 12 of the light guide plate 10. . However, the light guide plate 10 of such a structure emits light unevenly, and the light-emitting surface 12 of the light guide plate 10 which is closer to the light source has a higher luminance, and the light-emitting surface 12 of the light guide plate 10 which is farther from the light source has a lower luminance, so the light guide plate 10 is low. Uniform emission of light cannot be achieved. In order to improve the light uniformity of the light-emitting surface of the light guide plate, as shown in FIG. 3 and FIG. 4, a backlight module 14 comprising a rectangular light guide plate 15 is disclosed in US Pat. The lower surface, that is, the reflective surface, forms a plurality of intermittently distributed astigmatism grooves 16, an LED light source 17 disposed at a top corner of the light guide plate 15, and a scattering prism sheet 18 disposed above the light guide plate 15, The reflection sheet 19 under the light guide plate 15 is distributed in a circular arc shape with the light source 17 as a center, and the adjacent arcs are equally spaced (as shown in FIG. 4). The plurality of astigmatism grooves 16 can improve the light uniformity of the backlight module 14 to some extent. However, the light guide plate 15 of the structure has a shape that does not match the shape of the light guide plate 15 due to the shape of the astigmatism groove 16. Therefore, the light output of the backlight module 14 is not uniform enough. The light-emitting surface of the light guide plate 15 that is closer to the light source 17 has a higher luminance, and the light-emitting surface of the light guide plate 15 that is farther from the light source has a lower luminance. Therefore, the backlight module 14 is low. The light exiting the surface is still not uniform enough. [Summary of the Invention]
有鑒於此，提供一種可提高侧置式背光模組出光均勻 性之導光板及侧置式背光模組實為必要。 一種導光板，該導光板包括一入光面；一出光面，該 出光面與該入光面相交；一底面，該底面與該出光面相對， 該底面設置有複數網點；以及一侧面，該側面與該出光面 以及該底面相交。於鄰近該導光板入光面之底面，該網點 呈圓弧狀分佈，該圓弧具有同—圓心且朝向該導光板之入 光面於遠離該導光板入光面之底面，該網點呈行或列分 佈’該行或列平行於該導光板之侧面。 一種背光模組，該背光模組包括一光源以及一導光 板。料光板包括-人光面；—出光面，豸出光面與該入 光面相交，纟面’該底面與該出光面相對，該底面設置 ，複數網點；以及一侧面，該側面與該出光面以及該底面 相交’該光源相對於該導光板之入光面設置。於鄰近該導 先板入光面之底面，該網點呈圓弧狀分佈，該圓弧具有同 ^且㈣該導光板之人光面，於遠離該導光板入光面 面’該㈣呈行或列分佈，該行或料行於該導光板 之侧面。 9 201022744 相對於先前技術，該導光板及使用該導光板之背光模 組具有以下優點：因為於鄰近該導光板入光面之底面，該 網點呈圓弧狀分佈，該圓弧具有同一圓心且朝向該導光板 之入光面，於遠離該導光板入光面之底面，該網點呈行或 列分佈，該行或列平行於該導光板之一個側面，該網點之 分佈形狀與該導光板之形狀相匹配。所以，光線入射至該 導光板底面之網點時，光線經由該網點反射與散射後，於 導光板之出光面均勻出射，提高了導光板以及使用該導光 ®板之背光模組之出光均勻性。 【實施方式】 下面將結合附圖對本發明提供之導光板以及使用該導 光板之背光模組作進一步之詳細說明。 請一併參閱圖5與圖6,為本發明第一實施例提供之背 光模組20,該背光模組20包括一光源21以及一導光板22。 @該導光板22可為平板形或楔形，該平板形導光板可為長方 體或正方體，該楔形導光板之出光面可為長方形或正方 形。該導光板22之材料可為聚碳酸酯、聚曱基丙烯酸曱酯 (ΡΜΜΑ)或亞克力合成樹脂等。於本實施例中，該光源21 為點光源，該導光板22為被切去一頂角之長方體平板導光 板，該導光板22之材料為ΡΜΜΑ，且其被切去之頂角為等 腰三角形。 該導光板22包括一入光面221，該入光面221為切角 之側面、一與該入光面221相交之出光面222、一與該出光 201022744 面222相對之底面223、一與該出光面222及底面223相交 之侧面，該入光面221以及該側面位於該出光面222與該 底面223之間，該側面為第一侧面224、第二侧面225、第 三側面226、第四侧面227。該光源21相對該導光板22之 入光面221設置，該光源21為一發光二極體。 該導光板22之底面223設置有複數網點2230,該網點 2230可為向該導光板22外部凸出之半球形、棱錐、棱臺或 者為凹向導光板22内部之凹槽等。於本實施例中，該網點 ® 2230之形狀為向該導光板22外部凸出之半球形。於鄰近導 光板入光面221之底面223，該網點2230呈圓弧狀分佈， 該各個圓弧具有同一圓心，該圓心位於該光源21之發光中 心。該網點2230於同一個圓弧上均勻分佈，相鄰網點2230 之間之間距為0.1至1毫米。各個圓弧之間的間距相等，相 鄰兩個圓弧之間之間距為0.5至2毫米，且分佈於各個圓弧 上之網點2230之密度隨著遠離導光板入光面221增大，該 ⑩網點2230之大小不變。 於遠離導光板入光面221之底面223，該網點2230呈 行、列分佈，各行、列分別平行於該導光板22之第二側面 225、第三侧面226。具體地，於通過該導光板切角之對角 線與該導光板第一側面224、第二侧面225形成之區域内， 網點2230所在各行平行於該導光板22之第二側面225,該 網點2230於每一行上均勻分佈，相鄰網點之間之間距為0.1 至1毫米。相鄰行之間的間距相等，相鄰行之間的間距為 0.5至2毫米，且分佈於各個行上網點2230之密度隨著遠 11 201022744 離導光板入光面221增大，該網點2230之大小不變。於通 過該導光板切角之對角線與該導光板第三側面226、第四侧 面227形成之區域内，網點2230所在各列平行於該導光板 22之第三側面226，該網點2230於每一列上均勻分佈，相 鄰網點之間的間距為0.1至1毫米。各個列之間的間距相 等，相鄰列之間的間距與另一個區域之相鄰行之間的間距 相等，且分佈於各個列上網點2230之密度隨著遠離導光板 入光面221增大，該網點2230之大小不變。於相交之行與 列上，相鄰網點之間距相等。 為提高能量利用率，底面223可設有一增反膜（圖未 示），其為金屬或者介質鍍膜，如鋁膜和銀膜等。底面223 包括凸出之網點2230可藉由鍍膜等工藝形成增反膜，而使 該底面223具有較高之反射率。另外，該第一侧面224、第 二侧面225、第三側面226以及第四側面227也應該具有較 高之反射率，可藉由鍍增反膜（圖未示）來實現。 可以理解，本實施例之導光板底面223之網點2230所 形成之圓弧具有同一圓心，惟，該圓心之位置並無需特別 限制，只要其滿足複數網點2230形成之圓弧朝向該導光板 22之入光面221，即圓弧之凹面朝向該導光板22之入光面 221即可。 光源21發出之光線藉由導光板22之入光面221進入 到該導光板22之内部，一部分光線入射至該導光板底面 223之網點2230，一部分光線入射至該導光板出光面222 再反射至該導光板底面223之網點2230，光線入射至該網 12 201022744 點2230時，光線將改變其反射角度，即破壞光線傳遞之全 反射現象，光線將發生反射與散射，並向各個不同方向傳 • 輸，最終由該導光板22之出光面222射出。因為於鄰近該 導光板入光面221之底面223,該網點2230呈圓弧狀分佈， 於遠離該導光板入光面221之底面223，該網點2230呈行、 列分佈，該行、列分別平行於該導光板22之第二侧面225、 第三侧面226，該網點2230之分佈形狀與該導光板22之形 狀相匹配。所以，光線入射至該導光板底面223之網點2230 ® 時，光線經由該網點2230之反射與散射後，於導光板22 之出光面222均勻出射，提高了導光板22以及使用該導光 板22之背光模組20之出光均勻性。 請一併參閱圖7,為本發明第二實施例提供之背光模組 30，該背光模組30包括一光源31以及一導光板32。該光 源31為點光源，該導光板32為被切去一頂角之長方體平 板導光板。於本實施例中，該導光板32由聚碳酸酯材料製 ^成，且其被切去之一頂角為等腰三角形。 該導光板32包括一入光面321 ’該入光面321為切角 之侧面、一與該入光面321相交之出光面（圖未示）、一與該 出光面相對之底面323、一與該出光面及底面323相交之侧 面，該入光面321以及側面位於該出光面與該底面323之 間。該侧面為第一侧面324、第二侧面325、第三侧面326、 第四側面327。該光源31相對於該導光板32之入光面321 設置，該光源31為一發光二極體。 該導光板32之底面323設置有複數朝導光板32外部 13 201022744 凸出之網點3230，該網點3230為V型微結構。該網點3230 於鄰近導光板入光面321之底面323呈圓弧狀分佈，該各 個圓弧具有同一圓心，該圓心位於該光源31之右側。該網 點3230於同一個圓弧上均勻分佈，隨著遠離該導光板32 之入光面321，各個圓弧之間之間距越來越小，且各個圓弧 上網點3230之密度越來越大。 於遠離導光板入光面321之底面323，該網點3230呈 行、列分佈，各行、列分別平行於該導光板32之第二侧面 參325、第三侧面326。具體地，於通過該導光板切角之對角 線與該導光板第一側面324、第二侧面325形成之區域内， 網點3230所在各行平行於該導光板32之第二側面325,該 網點3230於每一行上均勻分佈，隨著遠離該導光板32之 入光面321，相鄰行之間的間距越來越小，且各個行上網點 3230之密度越來越大。於通過該導光板切角之對角線與該 導光板第三侧面326、第四側面327形成之區域内，網點 參3230所在各列平行於該導光板32之第三側面326,該網點 3230於每一列上均勻分佈，隨著遠離該導光板32之入光面 321，相鄰列之間的間距越來越小，且各個列上網點3230 之密度越來越大。 可以理解，網點於圓弧、每一行及每一列上之分佈可 以係不均勻的，而且網點之大小也係可藉由出光均勻性進 行任意調整的。 請參閱圖8,為本發明第三實施例提供之背光模組40， 該背光模組40包括一光源41以及一導光板42。該導光板 201022744 42包括一入光面421，以及一底面423，該底面423設置有 複數網點4230。本實施例之背光模組40與第二實施例之背 ^ 光模組30結構基本相同，其區別在於：該網點4230所在 圓弧之圓心於光源41左侧，且該複數網點4230形成之圓 弧朝向該導光板42之入光面421，即該圓弧之凹面朝向該 導光板42之入光面421，使所有從入光面421進入之光被 底面423複數網點4230所反射與散射。 請參閱圖9與圖10,為本發明第四實施例提供之背光 ❿模組50，該背光模組50包括一光源51以及一導光板52， 於本實施例中，該光源51為點光源，該導光板52為長方 體形之導光板，該導光板52之材料為PMMA。 該導光板52包括一入光面521，一與該入光面521相 交之出光面522、一與該出光面522相對之底面523、一與 該出光面522及底面523相交之側面，該入光面521以及 側面位於該出光面522與該底面523之間，該侧面為第一 參側面524、第二侧面525、第三側面526。該光源51相對該 導光板52之入光面521設置，該光源51為一發光二極體。 該導光板52之底面523設置有複數網點5230,該網點 5230為向該導光板52外部凸出之半球形。於鄰近導光板入 光面521之底面523，該網點5230呈圓弧狀分佈，該各個 圓弧具有同一圓心，該圓心位於該光源51之中心。該網點 5230於同一個圓弧上均勻分佈，相鄰網點5230之間的間距 為0.1至1毫米。各個圓弧之間的間距隨著遠離該導光板入 光面521逐漸減小，相鄰兩個圓弧之間的間距為0.5至2 15 201022744 毫米，且分佈於各個圓弧上之網點5230之密度隨著遠離導 光板入光面521逐漸增大，該網點5230之大小不變。 於遠離導光板入光面521之底面523，該網點5230呈 列分佈，各列平行於該導光板52之第二侧面525，該網點 5230於每一列上均勻分佈，相鄰網點之間的間距為0.1至1 毫米。相鄰列之間的間距隨著遠離該導光板入光面521逐 漸減小，相鄰列之間的間距為0.5至2毫米，且分佈於各個 列上之網點5230之密度隨著遠離導光板入光面521逐漸增 ® 大，該網點5230之大小不變。 請參閱圖11，為本發明第五實施例提供之背光模組 60，該背光模組60包括一光源61以及一導光板62，於本 實施例中，該光源61為點光源，該導光板62為正方體平 板導光板，該導光板62之材料為PMMA。 該導光板62包括一入光面621 ’ 一與該入光面621相 交之出光面（圖未示），一與該出光面相對之底面623、一 ⑩與該出光面622及底面623相交之侧面，該入光面621以 及侧面位於該出光面與該底面623之間，該侧面為第一侧 面624、第二侧面625、第三側面626。該光源61相對該導 光板62之入光面621設置，該光源61為一發光二極體。 該導光板62之底面623設置有複數網點6230,該網點 6230為向該導光板62外部凸出之半球形。於鄰近導光板入 光面621之底面623，該網點6230呈圓弧狀分佈，該各個 圓弧具有同一圓心，該圓心位於該光源61之中心。該網點 6230於同一個圓弧上均勻分佈，相鄰網點6230之間的間距 16 201022744 為0.1至1毫米。各個圓弧之間的間距隨著遠離該導光板入 Ψ 光面621逐漸減小，相鄰兩個圓弧之間的間距為0.5至2 毫米，且分佈於各個圓弧上之網點6230之密度隨著遠離導 光板入光面621逐漸增大，該網點6230之大小不變。 於遠離導光板入光面621之底面623，該網點6230呈 行或列分佈，具體地，於靠近該導光板第一侧面624之底 面623，該網點6230呈行分佈，該行平行於該導光板第一 侧面624。於靠近該導光板第三侧面626之底面623，該網 ® 點6230呈行分佈，該行平行於該導光板第三側面626。於 靠近該導光板第二侧面625之底面623，該網點6230呈列 分佈，該列平行於該導光板第二側面625。該網點6230於 每一行或列上均勻分佈，相鄰網點之間的間距為0.1至1 毫米。各個行或列之間的間距隨著靠近該導光板62之第一 侧面624、第二侧面625、第三側面626間距逐漸減小，相 鄰行或列之間的間距為0.5至2毫米，且分佈於各個行或列 ⑩上之網點6230之密度逐漸增大，該網點6230之大小不變。 可以理解，各個行或列之間的間距也可相等，網點於 圓弧、每一行及每一列上之分佈也可係不均勻的，而且網 點之大小也係可以藉由出光均勻性進行任意調整的。 本發明實施例提供之導光板及使用該導光板之背光模 組具有以下優點：因為於導光板之底面上設置有網點，於 鄰近該導光板入光面之底面，該網點呈圓弧狀分佈，該各 個圓弧具有同一圓心且朝向該導光板之入光面，於遠離該 導光板入光面之底面，該網點呈行或列分佈，該行或列平 17 201022744 行於該導光板之一個侧面，該網點之分佈形狀與該導光板 之形狀相匹配。所以，光線入射至該導光板底面之網點時， 光線經由該網點反射與散射後，於導光板之出光面均勻出 射，提高了導光板以及使用該導光板之背光模組之出光均 勻性。 另外，於導光板之入光面也可設置週期排列之微結 構，例如，縱向週期排列之v型微結構、週期分佈之半圓 柱型凸起微結構或者其他週期分佈之凸起微結構，上述微 ®結構同樣能提高光源入射光之均勻性。於導光板之出光面 也可設置網點，以提高該導光板之出光均勻性及控制該出 射光之方向。 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方 式，自不能以此限制本案之申請專利範圍。舉凡熟悉本案 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】 圖1為先前技術導光板之主視示意圖。 圖2為先前技術導光板之仰視示意圖。 圖3為先前技術第20030137824號美國專利申請之背 光模組之主視示意圖。 圖4為圖3之導光板反射面微結構之分佈示意圖。 圖5為本發明第一實施例提供之背光模組之主視示意 18 201022744 -圖。 圖6為本發明第一實施例提供之背光模組之仰視示意 圖。 圖7為本發明第二實施例提供之背光模組之仰視示意 圖。 圖8為本發明第三實施例提供之背光模組之仰視示意 圖。 圖9為本發明第四實施例提供之背光模組之主視示意 ⑩圖。 圖10為本發明第四實施例提供之背光模組之仰視示意 圖。 圖11為本發明第五實施例提供之背光模組之仰視示意 圖。 【主要元件符號說明】 背光模組 光源 導光板 入光面 底面 第一侧面 第二側面 第三側面 第四側面 20、30、40、50、60 21 、 31 、 41 、 51 、 61 22、32、42、52、62 221 、 321 、 421 、 521 、 621 223 ' 323 ' 423 、 523 、 623 224 ' 324 > 524 > 624 225 ' 325 ' 525 、 625 226 ' 326 ' 526 ' 626 227 、 327 19 201022744 網點 2230、3230、4230、5230、6230In view of the above, it is necessary to provide a light guide plate and a side-mounted backlight module that can improve the uniformity of light emission of the side-mounted backlight module. a light guide plate, the light guide plate includes a light incident surface; a light emitting surface, the light emitting surface intersects the light incident surface; a bottom surface, the bottom surface is opposite to the light emitting surface, the bottom surface is provided with a plurality of dots; and a side surface The side intersects the illuminating surface and the bottom surface. Adjacent to the bottom surface of the light-incident surface of the light guide plate, the dot is distributed in an arc shape, and the arc has the same-center and faces the light-incident surface of the light guide plate away from the bottom surface of the light-incident surface of the light guide plate, and the dot is present. Or column distribution 'the row or column is parallel to the side of the light guide. A backlight module includes a light source and a light guide plate. The light panel comprises a human light surface; a light emitting surface, the light emitting surface intersects the light incident surface, the bottom surface is opposite to the light emitting surface, the bottom surface is provided with a plurality of dots; and a side surface, the side surface and the light emitting surface And the bottom surface intersects the light source disposed relative to the light incident surface of the light guide plate. Adjacent to the bottom surface of the light-incident surface of the guiding plate, the dot is distributed in an arc shape, and the arc has the same light surface of the light guide plate, and is away from the light-incident surface of the light guide plate. Or a column distribution, the row or material traveling on the side of the light guide plate. 9 201022744 Compared with the prior art, the light guide plate and the backlight module using the light guide plate have the following advantages: because the bottom surface of the light guide plate adjacent to the light guide surface is distributed in an arc shape, the arc has the same center and The light-incident surface of the light guide plate is disposed away from the bottom surface of the light-incident surface of the light guide plate, and the dot is distributed in a row or a column. The row or column is parallel to one side of the light guide plate, and the distribution shape of the mesh point and the light guide plate The shapes match. Therefore, when the light is incident on the mesh point of the bottom surface of the light guide plate, the light is reflected and scattered through the mesh point, and then uniformly emitted on the light exit surface of the light guide plate, thereby improving the light uniformity of the light guide plate and the backlight module using the light guide plate. . [Embodiment] Hereinafter, a light guide plate provided by the present invention and a backlight module using the same will be further described in detail with reference to the accompanying drawings. Referring to FIG. 5 and FIG. 6 , the backlight module 20 includes a light source 21 and a light guide plate 22 according to the first embodiment of the present invention. The light guide plate 22 may be a flat plate shape or a wedge shape. The flat plate light guide plate may be a rectangular parallelepiped or a square shape, and the light exit surface of the wedge light guide plate may be rectangular or square. The material of the light guide plate 22 may be polycarbonate, decyl acrylate or acrylic synthetic resin. In the embodiment, the light source 21 is a point light source, and the light guide plate 22 is a rectangular parallelepiped flat light guide plate with a corner angle cut off. The material of the light guide plate 22 is ΡΜΜΑ, and the apex angle of the cut light plate is isosceles. triangle. The light guide plate 22 includes a light incident surface 221, the light incident surface 221 is a side surface of the chamfered corner, a light exit surface 222 intersecting the light incident surface 221, a bottom surface 223 opposite to the light exit 201022744 surface 222, and the light incident surface 221 The light incident surface 221 and the bottom surface 223 intersect with each other. The light incident surface 221 and the side surface are located between the light emitting surface 222 and the bottom surface 223. The side surface is a first side surface 224, a second side surface 225, a third side surface 226, and a fourth surface. Side 227. The light source 21 is disposed opposite to the light incident surface 221 of the light guide plate 22. The light source 21 is a light emitting diode. The bottom surface 223 of the light guide plate 22 is provided with a plurality of dots 2230. The mesh dots 2230 may be hemispherical, pyramidal, prismatic or concave grooves inside the light guide plate 22 protruding from the outside of the light guide plate 22. In the embodiment, the dot ® 2230 has a hemispherical shape that protrudes toward the outside of the light guide plate 22. The mesh points 2230 are distributed in an arc shape, and the respective arcs have the same center, and the center of the circle is located at the light-emitting center of the light source 21. The dots 2230 are evenly distributed on the same arc, and the distance between adjacent dots 2230 is 0.1 to 1 mm. The spacing between the arcs is equal, the distance between adjacent arcs is 0.5 to 2 mm, and the density of the dots 2230 distributed on the respective arcs increases as the distance from the light incident surface 221 of the light guide plate increases. The size of 10 outlets 2230 does not change. The mesh points 2230 are arranged in rows and columns, and the rows and columns are parallel to the second side surface 225 and the third side surface 226 of the light guide plate 22, respectively, away from the bottom surface 223 of the light-incident surface 221 of the light guide plate. Specifically, in a region formed by the diagonal line of the chamfer of the light guide plate and the first side surface 224 and the second side surface 225 of the light guide plate, the rows of the dot 2230 are parallel to the second side surface 225 of the light guide plate 22, and the dot is The 2230 is evenly distributed on each line, and the distance between adjacent dots is 0.1 to 1 mm. The spacing between adjacent rows is equal, the spacing between adjacent rows is 0.5 to 2 mm, and the density distributed at each row of the Internet access points 2230 increases with distance from the light guide surface 221 of the light guide plate at a distance of 11 201022744, the dot 2230 The size does not change. In a region formed by the diagonal line of the corner of the light guide plate and the third side surface 226 and the fourth side surface 227 of the light guide plate, the columns of the mesh points 2230 are parallel to the third side surface 226 of the light guide plate 22, and the mesh point 2230 is Each column is evenly distributed, and the spacing between adjacent dots is 0.1 to 1 mm. The spacing between the columns is equal, the spacing between adjacent columns is equal to the spacing between adjacent rows of another region, and the density of the landing points 2230 distributed in each column increases with distance from the light entrance surface 221 of the light guide plate. The size of the network 2230 does not change. On the intersecting rows and columns, the distance between adjacent dots is equal. In order to improve energy utilization, the bottom surface 223 may be provided with an anti-reflection film (not shown) which is a metal or dielectric coating such as an aluminum film and a silver film. The bottom surface 223 including the raised dots 2230 can form an anti-reflection film by a process such as plating, so that the bottom surface 223 has a high reflectance. In addition, the first side surface 224, the second side surface 225, the third side surface 226, and the fourth side surface 227 should also have a relatively high reflectivity, which can be realized by a plating anti-reflection film (not shown). It can be understood that the arcs formed by the mesh points 2230 of the bottom surface 223 of the light guide plate of the embodiment have the same center, but the position of the center of the circle is not particularly limited as long as it satisfies the arc formed by the plurality of dots 2230 toward the light guide plate 22. The light incident surface 221, that is, the concave surface of the circular arc faces the light incident surface 221 of the light guide plate 22. The light emitted by the light source 21 enters the light guide plate 22 through the light incident surface 221 of the light guide plate 22, and a part of the light is incident on the mesh point 2230 of the bottom surface 223 of the light guide plate. A part of the light is incident on the light exit surface 222 of the light guide plate and is reflected to the light guide surface 222. The dot 2230 of the bottom surface 223 of the light guide plate, when the light is incident on the net 12 201022744 point 2230, the light will change its reflection angle, that is, the total reflection phenomenon of the light transmission is destroyed, the light will be reflected and scattered, and transmitted to different directions. The light is finally emitted from the light exit surface 222 of the light guide plate 22. Because the bottom surface 223 of the light incident surface 221 of the light guide plate is adjacent to the bottom surface 223 of the light guide surface 221, the dot 2230 is disposed in an arc shape away from the bottom surface 223 of the light incident surface 221 of the light guide plate, and the dot 2230 is distributed in rows and columns. Parallel to the second side 225 and the third side 226 of the light guide plate 22, the distribution shape of the mesh point 2230 matches the shape of the light guide plate 22. Therefore, when the light is incident on the mesh point 2230 ® of the bottom surface 223 of the light guide plate, the light is uniformly reflected by the light exit surface 222 of the light guide plate 22 after being reflected and scattered by the mesh point 2230 , thereby improving the light guide plate 22 and using the light guide plate 22 . The light uniformity of the backlight module 20. Referring to FIG. 7 , a backlight module 30 according to a second embodiment of the present invention includes a light source 31 and a light guide plate 32 . The light source 31 is a point light source, and the light guide plate 32 is a rectangular parallelepiped flat plate light guide plate with a corner angle cut away. In the present embodiment, the light guide plate 32 is made of a polycarbonate material, and one of the cut corners is an isosceles triangle. The light guide plate 32 includes a light incident surface 321 'the light incident surface 321 is a side surface of the chamfered corner, a light emitting surface (not shown) intersecting the light incident surface 321 , and a bottom surface 323 opposite to the light emitting surface The light incident surface 321 and the side surface are located between the light emitting surface and the bottom surface 323 on a side surface intersecting the light emitting surface and the bottom surface 323. The side surface is a first side surface 324, a second side surface 325, a third side surface 326, and a fourth side surface 327. The light source 31 is disposed relative to the light incident surface 321 of the light guide plate 32. The light source 31 is a light emitting diode. The bottom surface 323 of the light guide plate 32 is provided with a plurality of dots 3230 protruding toward the outer portion 13 201022744 of the light guide plate 32. The mesh dots 3230 are V-shaped microstructures. The dot 3230 is distributed in an arc shape on a bottom surface 323 adjacent to the light incident surface 321 of the light guide plate. The arcs have the same center, and the center of the circle is located on the right side of the light source 31. The dots 3230 are evenly distributed on the same arc. As the distance from the light entrance surface 321 of the light guide plate 32 is smaller, the distance between the arcs is smaller and the density of each arc point 3230 is larger. . The grids 3230 are arranged in rows and columns, and the rows and columns are parallel to the second side surface 325 and the third side surface 326 of the light guide plate 32, respectively, away from the bottom surface 323 of the light-incident surface 321 of the light guide plate. Specifically, in a region formed by the diagonal line of the chamfer of the light guide plate and the first side 324 and the second side 325 of the light guide plate, the rows of the dots 3230 are parallel to the second side 325 of the light guide plate 32, and the dots are The 3230 is evenly distributed on each line. As the light entrance surface 321 is away from the light guide plate 32, the spacing between adjacent rows is smaller and the density of the respective line access points 3230 is larger and larger. In a region formed by the diagonal line of the chamfer of the light guide plate and the third side 326 and the fourth side 327 of the light guide plate, the columns of the dot reference 3230 are parallel to the third side 326 of the light guide plate 32, and the dot 3230 Evenly distributed on each column, as the distance from the light incident surface 321 of the light guide plate 32 is smaller, the spacing between adjacent columns becomes smaller and the density of the respective column access points 3230 becomes larger and larger. It can be understood that the distribution of the dots on the arc, each row and each column can be uneven, and the size of the dots can be arbitrarily adjusted by the uniformity of light emission. Please refer to FIG. 8 , which is a backlight module 40 according to a third embodiment of the present invention. The backlight module 40 includes a light source 41 and a light guide plate 42 . The light guide plate 201022744 42 includes a light incident surface 421 and a bottom surface 423 provided with a plurality of dots 4230. The backlight module 40 of the embodiment is basically the same as the backlight module 30 of the second embodiment, and the difference is that the center of the arc of the dot 4230 is on the left side of the light source 41, and the circle formed by the plurality of dots 4230 The arc faces the light incident surface 421 of the light guide plate 42, that is, the concave surface of the circular arc faces the light incident surface 421 of the light guide plate 42, so that all light entering from the light incident surface 421 is reflected and scattered by the plurality of mesh dots 4230 of the bottom surface 423. Referring to FIG. 9 and FIG. 10, a backlight module 50 is provided in a fourth embodiment of the present invention. The backlight module 50 includes a light source 51 and a light guide plate 52. In this embodiment, the light source 51 is a point light source. The light guide plate 52 is a rectangular parallelepiped light guide plate, and the material of the light guide plate 52 is PMMA. The light guide plate 52 includes a light incident surface 521, a light exit surface 522 intersecting the light incident surface 521, a bottom surface 523 opposite to the light exit surface 522, and a side surface intersecting the light exit surface 522 and the bottom surface 523. The smooth surface 521 and the side surface are located between the light-emitting surface 522 and the bottom surface 523. The side surface is a first reference side surface 524, a second side surface 525, and a third side surface 526. The light source 51 is disposed opposite to the light incident surface 521 of the light guide plate 52. The light source 51 is a light emitting diode. The bottom surface 523 of the light guide plate 52 is provided with a plurality of dots 5230, which are hemispherical convex toward the outside of the light guide plate 52. The bottom surface 523 of the light-incident surface 521 adjacent to the light guide plate is distributed in an arc shape, and the respective circular arcs have the same center, and the center of the circle is located at the center of the light source 51. The dots 5230 are evenly distributed on the same arc, and the spacing between adjacent dots 5230 is 0.1 to 1 mm. The spacing between the arcs decreases gradually away from the light incident surface 521 of the light guide plate, and the spacing between adjacent arcs is 0.5 to 2 15 201022744 mm, and the dots 5230 distributed on the respective arcs The density gradually increases as it goes away from the light incident surface 521 of the light guide plate, and the size of the halftone dot 5230 does not change. The grids 5230 are arranged in a row, and the rows are parallel to the second side 525 of the light guide plate 52. The dots 5230 are evenly distributed on each column, and the spacing between adjacent dots is evenly distributed on the bottom surface 523 of the light-incident surface 521 of the light guide plate. It is 0.1 to 1 mm. The spacing between adjacent columns gradually decreases with distance from the light-incident surface 521 of the light guide plate, the spacing between adjacent columns is 0.5 to 2 mm, and the density of the dots 5230 distributed on the respective columns is away from the light guide plate. The entrance surface 521 is gradually increased by a large amount, and the size of the outlet 5230 is unchanged. Please refer to FIG. 11 , which is a backlight module 60 according to a fifth embodiment of the present invention. The backlight module 60 includes a light source 61 and a light guide plate 62. In this embodiment, the light source 61 is a point light source, and the light guide plate is used. 62 is a square plate light guide plate, and the material of the light guide plate 62 is PMMA. The light guide plate 62 includes a light incident surface 621 ′ and a light emitting surface (not shown) intersecting the light incident surface 621 , and a bottom surface 623 , a 10 opposite to the light emitting surface intersects the light emitting surface 622 and the bottom surface 623 . The light incident surface 621 and the side surface are located between the light emitting surface and the bottom surface 623. The side surface is a first side surface 624, a second side surface 625, and a third side surface 626. The light source 61 is disposed opposite to the light incident surface 621 of the light guide plate 62. The light source 61 is a light emitting diode. The bottom surface 623 of the light guide plate 62 is provided with a plurality of dots 6230 which are hemispherical convex toward the outside of the light guide plate 62. The bottom surface 623 of the light-incident surface 621 of the light guide plate is disposed in an arc shape, and the respective arcs have the same center, and the center of the circle is located at the center of the light source 61. The dots 6230 are evenly distributed on the same arc, and the spacing 16 201022744 between adjacent dots 6230 is 0.1 to 1 mm. The spacing between the arcs gradually decreases as the distance from the light guide plate into the pupil 621, the spacing between adjacent arcs is 0.5 to 2 mm, and the density of the dots 6230 distributed on the respective arcs As the light incident surface 621 is gradually increased away from the light guide plate, the size of the mesh point 6230 does not change. The mesh points 6230 are arranged in rows or columns, specifically, adjacent to the bottom surface 623 of the first side surface 624 of the light guide plate. The dots 6230 are distributed in a row, and the row is parallel to the guide. The first side 624 of the light panel. The mesh ® point 6230 is distributed in a row adjacent to the bottom surface 623 of the third side 626 of the light guide plate, the row being parallel to the third side 626 of the light guide plate. The mesh points 6230 are arranged in a column adjacent to the bottom surface 623 of the second side surface 625 of the light guide plate, and the column is parallel to the second side surface 625 of the light guide plate. The dots 6230 are evenly distributed on each row or column with a spacing between adjacent dots of 0.1 to 1 mm. The spacing between the rows or columns gradually decreases as the distance between the first side 624, the second side 625, and the third side 626 of the light guide plate 62 decreases, and the spacing between adjacent rows or columns is 0.5 to 2 mm. The density of the dots 6230 distributed over the respective rows or columns 10 gradually increases, and the size of the dots 6230 does not change. It can be understood that the spacing between the rows or columns can be equal. The distribution of the dots on the arc, each row and each column can also be uneven, and the size of the dots can be arbitrarily adjusted by the uniformity of light emission. of. The light guide plate provided by the embodiment of the invention and the backlight module using the light guide plate have the following advantages: because the bottom surface of the light guide plate is provided with a mesh point, the mesh point is distributed in an arc shape adjacent to the bottom surface of the light incident surface of the light guide plate. Each of the arcs has the same center and faces the light incident surface of the light guide plate. The grid points are arranged in a row or a column away from the bottom surface of the light incident surface of the light guide plate. The row or column level 17 201022744 is on the light guide plate. On one side, the distribution shape of the dots matches the shape of the light guide plate. Therefore, when the light is incident on the mesh point of the bottom surface of the light guide plate, the light is reflected and scattered through the mesh point, and then uniformly emitted on the light exit surface of the light guide plate, thereby improving the light uniformity of the light guide plate and the backlight module using the light guide plate. In addition, a periodically arranged microstructure may be disposed on the light incident surface of the light guide plate, for example, a v-shaped microstructure arranged in a longitudinal period, a semi-cylindrical convex microstructure periodically distributed, or a convex microstructure having other periodic distributions, The micro-® structure also increases the uniformity of incident light from the source. A mesh point may also be disposed on the light-emitting surface of the light guide plate to improve the light uniformity of the light guide plate and control the direction of the emitted light. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application 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 persons 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 Fig. 1 is a front elevational view of a prior art light guide plate. 2 is a bottom view of a prior art light guide plate. Figure 3 is a front elevational view of the backlight module of the prior art of U.S. Patent No. 2,030, 137, 824. 4 is a schematic view showing the distribution of the microstructure of the reflecting surface of the light guide plate of FIG. FIG. 5 is a front view of a backlight module according to a first embodiment of the present invention. FIG. 6 is a bottom view of a backlight module according to a first embodiment of the present invention. FIG. 7 is a bottom view of a backlight module according to a second embodiment of the present invention. FIG. 8 is a bottom view of a backlight module according to a third embodiment of the present invention. FIG. 9 is a front view showing a backlight module according to a fourth embodiment of the present invention. FIG. 10 is a bottom view of a backlight module according to a fourth embodiment of the present invention. Figure 11 is a bottom plan view of a backlight module according to a fifth embodiment of the present invention. [Description of main component symbols] backlight module light source light guide plate light entrance surface bottom side second side third side fourth side surface 20, 30, 40, 50, 60 21 , 31 , 41 , 51 , 61 22 , 32 , 42, 52, 62 221 , 321 , 421 , 521 , 621 223 ' 323 ' 423 , 523 , 623 224 ' 324 > 524 > 624 225 ' 325 ' 525 , 625 226 ' 326 ' 526 ' 626 227 , 327 19 201022744 outlets 2230, 3230, 4230, 5230, 6230