1283777 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種導光板及其製造方法及採用該導光 板之背光模組，尤指一種應用於液晶顯示器之導光板及其 製造方法及採用該導光板之背光模組。 【先前技術】 由於液晶顯示器具輕、薄、耗電小等優點，廣泛應用 於筆記本電腦、行動電話、個人數位助理等現代化資訊設 備。因液晶本身不具發光特性，需為其提供背光模組以實 現顯示功能。 ' 眾所週知，背光模組之出光均勻度須達到預定需求， 從而提昇液晶顯示器的色彩對比度、全屏區域輝度效果及 整機的可視角度。 、酋一先如技術之月光模組包括光源及導光板，光源係相對 導光板之入射面設置，該導光板引導自光源發出光束之傳 輸方向，將線光源或點光源轉換成面光源出射。該導光板 之底面或出光面分佈複數網點，其可破壞光束於導光板内 全反射條件，使光束散射以提高導光板出射光束 分佈網點之紙组之整體性能。於導光板底面 第5,363,294於^ 1994年11月8曰公告之美國專利 2000年丄月4日^、 V光板出光面分佈網點之技術可參見 4月10日公生之么告之美國專利第6,011，602號及2〇〇i年 σ A國專利第6,215,936號。該等網點之疏 1283777 密、大小均可有不同設計以適應不同之背光模組 可設言 =方形1形、六角形、菱形或梯形突起等/周點 先則技術導光板之製程中，網點之製 月1日公告之中華民國專利第493148號及2003 射出ϋΛ公告之中華民國專利第538260號。惟，採用 :、/ 4，會產生欠注（樹脂不轉動）及熔融樹脂隨 令部固化發生體積收縮等缺陷，需藉由保壓力補充，若保 壓力不足，則導致模腔變形及導光板厚度 難 於精確等缺陷。 八了雞 種採用按壓方式之先前技術可參見2GG3年7月1 日公告之中華民國專利第5删5號。惟，採用該按壓方式 ▲所而滾子之機械精度要求高，加工時間長、製造成本 南0 另’受限於先前技術之製造方法，所製得之導光板網 f射為微米級，不易達職均料要求，使得目視導光 可發現暗帶或明顯亮紋’影響導光板、背光模組乃至 液晶顯示器之光學性能。 有鑑於此’提供—種可提昇出光均句度之導光板及其 製這方法及採用該導光板之背光模組實為必需。 【發明内容】 本發明之目的在於提供—種出光均句度較高之導光 板。 本發明之又—目的在於提供—種出光均句度較高之導 1283777 光板之製造方法。 本發明之另一 光模組。 目的在於提供一種出光均勻度較高之背 本發明導光板包括基材及染料層，該基材包括入射 面、與入射面相連之出光面及相對出光面之底面，該染料 層佈設於基材之底面並包括藉以罩曝光形成且規則分佈 之反應部及未經曝光之非反應部，該反應部盥非反 應部具有不同之折射率，該出光面上設置複數突起， 導光板内部傳輸之光束藉由該染料層之反應部及出光面上 之複數突起破壞全反射條件後自出光面出射。 本發明導光板之製造方法包括以下步驟：提供具有二 相對表面之基材’該基材之第—表面具有複數突起；於基 材第二表面塗佈染料層；採用光罩曝光方式對染料層曝 光，以於該染料層上形成規則分佈之反應部及未曝光 之非反應部，進而獲得導光板。 本發明背光模組包括導光板及光源，該導光板包括基 材及染料層，該基材包括入射面、與入射面相連之出光面 及相對出光面之底面，該光源係相對該入射面設置，該染 料層佈設於基材之底面並包括藉由光罩曝光形成且規則分 佈之反應部及未曝光之非反應部，該反應部與非反 應部具有不同之折射率，該出光面上設置複數突起， 導光板内部傳輸之光束藉由該染料層之反應部及出光面上 之複數突起破壞全反射條件後自出光面出射。 相較於先前技術，由於本發明導光板之基材底面佈設 1283777 包括藉由光罩曝光形成且規則分佈之反應部及未曝光之 非反應部之染料層、該出光面上設置複數突起，該染料層 之反應部同非反應部具有不同之折射率，其通過不同之折 射率破壞光束於導光板内部傳輸之全反射條件，使光束散 射；出光面上之複數突起通過自身之立體結構破壞光束於 導光板内部傳輸之全反射條件，使光束散射，從而提高導 光板出射光束之均勻性。另，由於利用類似半導體之採用 光罩之曝紐術，使得該㈣層具有較先前技術網點更精 細之折射率分佈圖案（可達奈求級），以此增加導光板及 背光模組之出光均勻度與輝度。 【實施方式】 請參閱第一圖，係本發明背光模組第一實施方式，該 背光模組100包括螢光燈管m、部分包圍該螢光燈"管工二 之燈罩m及一導光板120。該螢光燈管U1係用以發出 光束’該燈罩112防止光束能量損失，該導光板12〇則引 導螢光燈管m發出及燈罩112反射之^束之 將其轉換為面光源出射。 120為平板形導光板，係採用壓克力、玻璃、 來曱基丙烯酸甲m碳酸§旨#透明材質製成。盆 材（未標示）與染料層⑽，該基材包括—人射面、^、二 二射面m相連之出光面122及與出光面122相對之底面 官111發出及燈罩 。該出光面122上 該入射面121係用以接收營光燈 112反射之光束，其上可塗覆抗反射膜 1283777 設置複數立方體狀突起1221，且該複數突起i22i之分佈 密度=沿遠離入射面121之方向遞增。 °月併參閱第二圖，該基材之底面123設置染料層 130’該染料層13()採用之染料係光敏性染料，—般選用醇 類、酯類或花菁素〇—)、酞菁（Phthal〇cyanine) 或金屬化偶氮化合物（細·Metal c ⑽採用之塗佈方式可為旋轉式、浸黏式、滾筒式^ 式或擠壓式等，包括反應部131及非反應部132。該反應 4 131係藉由光罩曝光形成（詳後述），與未經曝光之非 反應部132 ^具不同之折射率，因染料層具不同折射率部 份’故可破壞導光板12〇内部傳輸之光束之全反射條件， 使光束散射，並由出光面122均勻射出。該出光面122上 設置之複數突# 1221則通過自身之立體結構破壞導光板 120内傳輸之光束之全反射條件，使光束散射。該惟複 數突起1221之尺寸大於該反應部131之尺寸。該反應部 131為立方體狀’為提高導光板m出射以之輝度及均 勻性，該反應部131之大小或密度係沿遠離入射面ΐ2ι之 方向遞增。該反應部131亦可為其他合適之形狀。 本發明導光板之基材底面塗佈染料層之反應部之形 狀、大小、疏密均可有不同設計以適應不同之背光模組。 請參閱第三圖’染料層包括反應部231與非反應部加， 其中反應部231呈圓柱狀’且係均勻分佈。參閱第四圖， 染料層包括反應部331與非反應部332，其中反應部 呈三角柱狀，且係均勻分佈。 11 1283777 請參閱第五圖，係本發明背光模組第二實施方式。該 背光模組400包括複數點光源411及一導光板420。該導 光板420係楔形導光板，其包括基材（未標示）及染料層 430，該基材包括一入射面421、一與入射面421傾斜相連 之底面423、一與底面423相對之出光面422及側面424。 該出光面422上設置複數條狀突起4221，且該複數突起 4221之寬度大小係沿遠離入射面421之方向遞增。 該點光源411係對應該入射面421佈設，本實施方式 中，該點光源411可為發光二極體或小燈泡，且可藉由配 置複數不同顏色之發光二極體或小燈泡以調配所需之光源 顏色與輝度。 該染料層430係塗佈於底面423以改善導光板420及 背光模組400之整體出光均勻度及光學性能。該染料層430 係採用旋轉式、浸黏式、滾筒式、喷塗式或擠壓式等方法 佈設於底面423,並經光罩曝光製造方法以獲得超微細設 計。 請參閱第六圖，本發明之導光板製造方法包括以下步 驟：具複數突起之基材射出、染料層塗佈、光罩曝光製程 及導光板切割。以下配合第七圖至第十圖對該導光板製造 方法進行詳細說明。 請參閱第七圖，藉由射出成型方式提供基材520,該 基材520包括入射面521、出光面522及底面523，該基材 520之出光面522具有複數均勻分佈之圓柱狀突起5221。 該基材520之材質一般為壓克力、玻璃、聚甲基丙烯酸曱 1283777 酯或聚碳酸酯等透明材質。 參閱第八圖，於基材520之底面523塗佈染料層530。 該染料層530 —般選用醇類、酯類或花菁素（Cyanine)、 苯二曱藍染料（Phthalocyanine )或金屬化偶氮化合物 (AZO-Metal Complex)有機染料，塗佈方式為旋轉式、 浸黏式、滾筒式、喷塗式或擠壓式等。 一併參閱第九圖及第十圖，採用光罩曝光製造方法對 染料層530曝光，形成反應部531與非反應部532，其中 反應部531呈圓柱狀，且係均勻分佈。該反應部531與未 經曝光之非反應部532具不同之折射率，使得該染料層530 可破壞導光板内部光束之全反射條件，改變光束之傳輸路 徑。其中，光罩600之形狀依不同之背光模組可有複數不 同型態。 參閱第十圖，將經光罩曝光後之基材520與染料層530 之組合依據所需尺寸進行切割，得到導光板510。當然， 亦可採用本發明之導光板製造方法直接製得一塊導光板鲁 510，此時即可不需切割步驟。 請參閱第十一圖，係本發明背光模組第三實施方式。 該背光模組700包括二螢光燈管711、部分包圍該二螢光 燈管711之二燈罩712及一導光板（未標示）。該導光板 包括基材720與染料層730,該基材包括二入射面721、與 入射面721相連之出光面722及與出光面722相對之底面 723。該出光面722上設置複數呈梯形狀之突起7221，且， 該突起7221之分佈密度自二入射面721向基材720中間遞 13 1283777 增。該染料層730佈設於底面723並包括藉由光罩曝光形 成且規則分佈之反應部，以增加背光模組7〇〇之出光均勻 度。 該背光模組700還包括鄰近該出光面722之第一擴散 板703、棱鏡片702及第二擴散板7〇1。於鄰近染料層^〇 -側設置反射板704以防止光束自底面723逸出，從而增 加背光模組700之出光輝度。 曰 由於以上所述導光板出光面上之突起尺寸較大，故可 通過射出成型得到，並通過該突起調節出光均勾度；又因 以上所述之染料層皆係採用類似半導體之光罩:曝光技 術’使得該染料層具有較先前技術網點更精細之折射率分 佈圖案’該圖案尺寸可達奈米級 及背光模組之出光均句度。 乂㈣步增加導光板 出專：=述渔本發明破已符合發明專利要件，爱依法提 出專射上所述者僅為 舉凡熟悉本案技藝之人+，产4~ 心竿乂仏貝轭方式， 效修飾或變化，皆應包含；：：案發明精神所作之等 【圖式簡單說明】 以下之申請專利範圍内。 圖。第一圖係本發明背光模組第-實施方式之立體示意 第二圖係第一圖所示染料 第三圖係本發明導光板第t 意圖。 面示意圖。 h先板第二實施方式之染料層之平 第四圖係本發明導光 弟一實靶方式之染料層之平 1283777 面示意圖。 第五圖係本發明背光模組第二實施方式之立體示意 圖。 第六圖係本發明導光板製造方法之流程圖。 第七圖至第十圖係本發明導光板製造方法之步驟示 意圖。 第十一圖係本發明背光模組第三實施方式之立體示 意圖。 【主要元件符號說明】 背光模組 100 、 400 、 700 螢光燈管 111 、 711 燈罩 112 、 712 點光源 411 導光板 120 、 420 、 510 基材 520 > 720 入射面 121 、 421 、 521 出光面 122 、 422 、 522 底面 123 、 423 、 523 側面 124 、 424 染料層 130 、 430 、 530 、 730 反應部 131 、 231 、 331 、 531 非反應部 132、232、332、 532 突起 1221 、 4221 、 5221 、 7221 光罩 600 擴散板 701 、 703 稜鏡片 702 反射板 704 151283777 IX. Description of the Invention: The present invention relates to a light guide plate, a method of manufacturing the same, and a backlight module using the same, and more particularly to a light guide plate applied to a liquid crystal display, a method for manufacturing the same, and a method for manufacturing the same The backlight module of the light guide plate. [Prior Art] Due to its advantages of lightness, thinness, and low power consumption, liquid crystal display devices are widely used in modern information devices such as notebook computers, mobile phones, and personal digital assistants. Since the liquid crystal itself does not have a light-emitting property, it is required to provide a backlight module to realize the display function. It is well known that the uniformity of the light output of the backlight module must meet the predetermined requirements, thereby improving the color contrast of the liquid crystal display, the brightness of the full-screen area and the viewing angle of the whole machine. The moonlight module of the Emirates first includes a light source and a light guide plate, and the light source is disposed opposite to the incident surface of the light guide plate, and the light guide plate guides the transmission direction of the light beam from the light source, and converts the line light source or the point light source into a surface light source. The bottom surface or the light-emitting surface of the light guide plate is distributed with a plurality of dots, which can destroy the total reflection condition of the light beam in the light guide plate, so that the light beam is scattered to improve the overall performance of the paper group of the light-emitting plate output beam distribution dot. 5,363,294 on the underside of the light guide plate, US Patent No. 4, published on November 8th, 1994. The technology of the distribution point of the V-plane light exit surface can be found in the US Patent No. 6,011 on April 10th. , 602 and 2〇〇i years σ A country patent No. 6,215,936. The 1283777 dense and sized of these outlets can be designed to suit different backlight modules. It can be set to = square 1 shape, hexagonal shape, diamond shape or trapezoidal protrusion, etc. / week point first technology light guide plate process, network point On January 1st, the Republic of China Patent No. 493148 and 2003 were issued to announce the Republic of China Patent No. 538260. However, the use of:, / 4, there will be defects such as under-injection (resin does not rotate) and the volume shrinkage of the molten resin with the curing of the fuse, which needs to be supplemented by the pressure. If the pressure is insufficient, the cavity deformation and the light guide plate are caused. Thickness is difficult to be accurate and other defects. Eight chickens The prior art of pressing the method can be referred to the announcement of the Republic of China Patent No. 5 on July 1, 2G3. However, the roller has a high mechanical precision, a long processing time, a manufacturing cost of the south, and is limited by the manufacturing method of the prior art, and the obtained light guide plate mesh is micron-sized, which is difficult. At the same time, the requirements of the materials are such that the visual light guide can find that the dark band or the bright light pattern affects the optical performance of the light guide plate, the backlight module and even the liquid crystal display. In view of the above, it is necessary to provide a light guide plate capable of improving the uniformity of the light and the method and the backlight module using the same. SUMMARY OF THE INVENTION An object of the present invention is to provide a light guide plate having a high degree of light uniformity. Still another object of the present invention is to provide a method for manufacturing a light guide plate having a high degree of uniformity of light. Another optical module of the present invention. The purpose of the present invention is to provide a substrate having a high uniformity of light emission. The light guide plate of the present invention comprises a substrate and a dye layer. The substrate comprises an incident surface, a light emitting surface connected to the incident surface, and a bottom surface of the opposite light emitting surface. The dye layer is disposed on the substrate. The bottom surface includes a reaction portion formed by exposure by a mask and a regularly distributed reaction portion and an unexposed non-reaction portion. The reaction portion 盥 non-reaction portion has a different refractive index, and the plurality of protrusions are disposed on the light-emitting surface, and the light beam transmitted inside the light guide plate The plurality of protrusions on the reaction portion and the light-emitting surface of the dye layer break the total reflection condition and then exit from the light-emitting surface. The method for manufacturing a light guide plate of the present invention comprises the steps of: providing a substrate having two opposite surfaces, wherein the first surface of the substrate has a plurality of protrusions; coating the dye layer on the second surface of the substrate; and using the reticle to expose the dye layer Exposure is performed to form a regularly distributed reaction portion and an unexposed non-reaction portion on the dye layer, thereby obtaining a light guide plate. The backlight module of the present invention comprises a light guide plate and a light source, the light guide plate comprises a substrate and a dye layer, and the substrate comprises an incident surface, a light emitting surface connected to the incident surface and a bottom surface of the opposite light emitting surface, wherein the light source is disposed opposite to the incident surface The dye layer is disposed on the bottom surface of the substrate and includes a reaction portion formed by the reticle exposure and regularly distributed, and an unexposed non-reaction portion having a different refractive index from the non-reaction portion. The plurality of protrusions, the light beam transmitted inside the light guide plate is emitted from the light-emitting surface by destroying the total reflection condition by the plurality of protrusions on the reaction portion and the light-emitting surface of the dye layer. Compared with the prior art, since the bottom surface of the substrate of the light guide plate of the present invention is disposed 1283777, including a reaction layer formed by exposure of the reticle and regularly distributed, and a dye layer of the unexposed non-reaction portion, and the plurality of protrusions are disposed on the light-emitting surface, The reaction portion of the dye layer has a different refractive index from the non-reaction portion, and the different refractive index destroys the total reflection condition of the light beam transmitted inside the light guide plate to scatter the light beam; the plurality of protrusions on the light-emitting surface break the light beam through the three-dimensional structure of the light-emitting surface The total reflection condition transmitted inside the light guide plate scatters the light beam, thereby improving the uniformity of the light beam emitted from the light guide plate. In addition, due to the use of a semiconductor-like exposure mask, the (four) layer has a finer refractive index distribution pattern than the prior art dots (up to the level), thereby increasing the light output of the light guide plate and the backlight module. Uniformity and brightness. [Embodiment] Please refer to the first embodiment, which is a first embodiment of a backlight module of the present invention. The backlight module 100 includes a fluorescent lamp m, a lamp cover m partially surrounding the fluorescent lamp, and a lampshade m and a guide. Light board 120. The fluorescent tube U1 is used to emit a light beam. The lamp cover 112 prevents beam energy loss. The light guide plate 12 turns the fluorescent lamp m and the reflector 112 to convert it into a surface light source. 120 is a flat-shaped light guide plate, which is made of acrylic, glass, and yttrium-based acrylic acid. The potting material (not shown) and the dye layer (10) comprise a light-emitting surface 122 connected to the human surface, the second surface, and the bottom surface opposite to the light-emitting surface 122, and a lampshade. The incident surface 121 of the light-emitting surface 122 is configured to receive a light beam reflected by the camping light 112, and the anti-reflection film 1283777 may be coated thereon to form a plurality of cube-shaped protrusions 1221, and the distribution density of the plurality of protrusions i22i is along the distance from the incident surface. The direction of 121 is incremented. ° ° and referring to the second figure, the bottom surface 123 of the substrate is provided with a dye layer 130' dye dye layer 13 () dye-based photosensitive dye, generally selected alcohol, ester or cyanine 〇 -), 酞Phthal〇cyanine or metallized azo compound (fine·Metal c (10) can be applied by rotary, dip-bonding, drum-type or extrusion, including reaction part 131 and non-reaction part 132. The reaction 4 131 is formed by exposure of a photomask (described later), and has a different refractive index from the unexposed non-reactive portion 132, because the dye layer has different refractive index portions, so that the light guide plate 12 can be destroyed. The total reflection condition of the internally transmitted beam causes the light beam to be scattered and uniformly emitted by the light exit surface 122. The complex protrusion #1221 disposed on the light exit surface 122 destroys the total reflection of the light beam transmitted through the light guide plate 120 by its own three-dimensional structure. The size of the reaction portion 131 is larger than the size of the reaction portion 131. The reaction portion 131 has a cubic shape. To increase the brightness and uniformity of the light guide plate m, the size or density of the reaction portion 131 The line is far away from the incident The direction of the ΐ2ι is increased. The reaction portion 131 may also have other suitable shapes. The shape, size, and density of the reaction portion of the substrate coated with the dye layer on the bottom surface of the substrate of the present invention may be differently designed to accommodate different backlight modes. Referring to the third figure, the dye layer includes a reaction portion 231 and a non-reaction portion, wherein the reaction portion 231 has a cylindrical shape and is uniformly distributed. Referring to the fourth embodiment, the dye layer includes a reaction portion 331 and a non-reaction portion 332. The reaction unit has a triangular column shape and is evenly distributed. 11 1283777 Please refer to the fifth embodiment, which is a second embodiment of the backlight module of the present invention. The backlight module 400 includes a plurality of point light sources 411 and a light guide plate 420. The light guide plate The 420 series wedge-shaped light guide plate comprises a substrate (not shown) and a dye layer 430. The substrate comprises an incident surface 421, a bottom surface 423 obliquely connected to the incident surface 421, a light emitting surface 422 opposite to the bottom surface 423, and a side surface. 424. The plurality of strip-shaped protrusions 4221 are disposed on the light-emitting surface 422, and the width of the plurality of protrusions 4221 is increased in a direction away from the incident surface 421. The point light source 411 is disposed corresponding to the incident surface 421, In this embodiment, the point light source 411 can be a light-emitting diode or a small light bulb, and can be configured with a plurality of light-emitting diodes or small light bulbs of different colors to match a desired color and brightness of the light source. The coating is applied to the bottom surface 423 to improve the overall light uniformity and optical performance of the light guide plate 420 and the backlight module 400. The dye layer 430 is disposed by a rotary method, a dip-coating method, a drum type, a spray type or a squeeze type. On the bottom surface 423, and through the reticle exposure manufacturing method to obtain an ultra-fine design. Referring to the sixth figure, the method for manufacturing the light guide plate of the present invention comprises the following steps: substrate ejection with multiple protrusions, dye layer coating, mask exposure Process and light guide plate cutting. The method of manufacturing the light guide plate will be described in detail below with reference to the seventh to tenth drawings. Referring to the seventh embodiment, the substrate 520 is provided by injection molding. The substrate 520 includes an incident surface 521, a light exit surface 522, and a bottom surface 523. The light exit surface 522 of the substrate 520 has a plurality of uniformly distributed cylindrical protrusions 5221. The material of the substrate 520 is generally a transparent material such as acrylic, glass, poly(meth)acrylate 1283777 or polycarbonate. Referring to the eighth figure, a dye layer 530 is applied to the bottom surface 523 of the substrate 520. The dye layer 530 is generally selected from an alcohol, an ester or a Cyanine, a Phthalocyanine or an AZO-Metal Complex organic dye, and the coating method is a rotary type. Dip, drum, spray or extrusion. Referring to the ninth and tenth views, the dye layer 530 is exposed by a mask exposure manufacturing method to form a reaction portion 531 and a non-reaction portion 532, wherein the reaction portion 531 has a cylindrical shape and is uniformly distributed. The reaction portion 531 has a different refractive index from the unexposed non-reaction portion 532, so that the dye layer 530 can break the total reflection condition of the light beam inside the light guide plate and change the transmission path of the light beam. The shape of the reticle 600 may have a plurality of different types depending on the backlight module. Referring to the tenth figure, the combination of the substrate 520 exposed by the reticle and the dye layer 530 is cut according to the required size to obtain a light guide plate 510. Of course, a light guide plate 510 can also be directly produced by using the light guide plate manufacturing method of the present invention, and the cutting step can be eliminated. Please refer to FIG. 11 , which is a third embodiment of the backlight module of the present invention. The backlight module 700 includes two fluorescent tubes 711, two lamp covers 712 partially surrounding the two fluorescent tubes 711, and a light guide plate (not shown). The light guide plate includes a substrate 720 and a dye layer 730. The substrate includes two incident surfaces 721, a light exit surface 722 connected to the incident surface 721, and a bottom surface 723 opposite to the light exit surface 722. A plurality of protrusions 7221 having a trapezoidal shape are disposed on the light-emitting surface 722, and the distribution density of the protrusions 7221 is increased from the two incident surfaces 721 to the substrate 720 by 13 1283777. The dye layer 730 is disposed on the bottom surface 723 and includes a reaction portion formed by the reticle exposure and regularly distributed to increase the light uniformity of the backlight module 7. The backlight module 700 further includes a first diffusion plate 703, a prism sheet 702 and a second diffusion plate 7〇1 adjacent to the light exit surface 722. A reflecting plate 704 is disposed adjacent to the dye layer to prevent the light beam from escaping from the bottom surface 723, thereby increasing the light luminance of the backlight module 700.曰Because the above-mentioned light guide surface has a large protrusion size on the light-emitting surface, it can be obtained by injection molding, and the light-wound degree is adjusted by the protrusion; and the dye layer described above adopts a semiconductor-like photomask: The exposure technique 'makes the dye layer to have a finer refractive index profile than the prior art dots'. The pattern size is up to the nano-level and the light-emitting uniformity of the backlight module.乂 (4) step to increase the light guide plate out of the special: = said fishermen's invention has broken the invention patent requirements, love to put forward the special shots on the above mentioned only for those who are familiar with the skills of this case +, production 4 ~ heart 竿乂仏 轭 方式, effect modification or change, should be included;:: the spirit of the invention, etc. [Simple description of the schema] The following patent application scope. Figure. The first drawing is a perspective view of a first embodiment of the backlight module of the present invention. The second drawing is a dye shown in the first figure. The third drawing is the t-intention of the light guiding plate of the present invention. Schematic diagram. h The first layer of the dye layer of the second embodiment is a plan view of the dye layer of the light guide of the present invention. Fig. 5 is a perspective view showing a second embodiment of the backlight module of the present invention. Figure 6 is a flow chart showing a method of manufacturing a light guide plate of the present invention. The seventh to tenth drawings are schematic illustrations of the steps of the method of manufacturing the light guide plate of the present invention. The eleventh drawing is a perspective view of a third embodiment of the backlight module of the present invention. [Main component symbol description] backlight module 100, 400, 700 fluorescent tube 111, 711 lamp cover 112, 712 point light source 411 light guide plate 120, 420, 510 substrate 520 > 720 incident surface 121, 421, 521 light emitting surface 122, 422, 522 bottom surface 123, 423, 523 side 124, 424 dye layer 130, 430, 530, 730 reaction portion 131, 231, 331, 531 non-reaction portion 132, 232, 332, 532 protrusion 1221, 4221, 5221, 7221 Photomask 600 Diffuser 701, 703 Bake 702 Reflector 704 15