1360696 六、 [0001] [0002] [0003] [0004] 100’年.06月21-日接年替換頁發明說明： 【發明所屬之技術領域】 本發明涉及一種背光模組及其光學板，尤其涉及一種用 於液晶顯示之背光模組及其光學板。 【先前技術】 由於液晶顯示器面板之液晶本身不具發光特性，因而為 達到顯示效果需給液晶顯示器面板提供一面光源裝置， 如背光模組。背光模組之作用係向液晶顯示器面板供應 亮度充分且分佈均勻之面光源。 請參見圖1，所示為一種習知之背光模組1〇〇，其包括框 架101、反射板102、擴散板1〇3 '稜鏡片1〇4及至少一發 光二極體105。框架101包括一底板1011及複數從該底板 1011邊緣向其同一侧垂直延伸之側壁1〇13。底板1〇11與 複數侧壁1013共同形成一腔體1〇7。發光二極體1〇5包括 出光部1051與基部1 053，基部1〇53與電路板（未標示）相 連並固定於底板1011。擴散板1〇3與棱鏡片1〇4依次設置 於複數側壁1013頂部。反射板1〇2為一小框體結構，其可 配置於框架101内部。反射板1〇2之底部開設有與發光二 極體105相對應之通孔（未標示），發光二極體1Q5之出 光部1051穿過相應通孔。發光二極體1〇5之基部丨〇53頂 持該反射板102 » 工作時，發光二極體105產生之光線被反射板1〇2反射進 入擴散板103，在擴散板1〇3中被均勻擴散後光線繼續進 入稜鏡片104，在棱鏡片1〇4之作用下，出射光線發生一 定程度之聚集，使得背光模組1〇〇在特定視角範圍内之亮 096116812 表單編號A0101 第3頁/共19頁 1003221544-0 [0005] [0005] 1360696 [0006] [0007] [0008] 096116812 j 100年.06月21日修ίΕ替換頁 度提高。 然而，由於發光二極體105為點光源，其到達擴散板103 上各處之距離大小不相等，位於發光二極體105正上方之’ 擴散板103單位區域所接受光較多，位於發光極管105四 周之擴散板103單位區域所接受光較少，因此容易在發光 . 二極體105正上方之區域形成*¾區，而在其上方之四周區 - 域形成暗區，影響背光模組100之出光均勻性。為此，通 常需在發光二極體105之上方設置反射片106，以控制發 光二極體105正上方之出光量。發光二極體105與反射片 106之搭配設計，可一定程度上減弱發光二極體105正上 方之亮區，惟，背光模組100仍然存在出光不均之缺點。 【發明内容】 鑒於上述狀況，有必要提供一種出光均勻之背光模組及 其光學板。 一光學板，其包括至少一光學板單元，該光學板單元包 括出光面、與該出光面相對之底面及形成於該出光面之 散射層，該散射層環繞該光源容納部設置且間隔分佈， 該底面形成有複數球形凹槽，且開設有至少一光源容納 部。 一背光模組，其包括框架、至少一側光式點光源及光學 板；該框架包括底板及複數從該底板邊緣延伸之相互連 接之侧壁，該複數側壁與該底板形成一腔體；該至少一 具有出光部之點光源設於該底板表面；該光學板設置於 該腔體内，該光學板包括至少一光學板單元，該光學板 單元包括出光面及與該出光面相對之底面，該底面形成 表單编號Α0101 第4頁/共19頁 1003221544-0 13606961360696 6. [0001] [0002] [0003] [0004] 100' year. June 21-day replacement year invention description: [Technical Field] The present invention relates to a backlight module and an optical plate thereof, More particularly, it relates to a backlight module for liquid crystal display and an optical plate thereof. [Prior Art] Since the liquid crystal of the liquid crystal display panel itself does not have a light-emitting property, it is necessary to provide a light source device such as a backlight module to the liquid crystal display panel in order to achieve the display effect. The function of the backlight module is to supply a surface light source with sufficient brightness and uniform distribution to the liquid crystal display panel. Referring to FIG. 1, a conventional backlight module 1A includes a frame 101, a reflector 102, a diffusion plate 1〇3', a chip 1〇4, and at least one light-emitting diode 105. The frame 101 includes a bottom plate 1011 and a plurality of side walls 1〇13 extending perpendicularly from the edge of the bottom plate 1011 toward the same side thereof. The bottom plate 1〇11 and the plurality of side walls 1013 together form a cavity 1〇7. The light-emitting diode 1〇5 includes a light-emitting portion 1051 and a base portion 1053, and the base portion 〇53 is connected to a circuit board (not shown) and fixed to the bottom plate 1011. The diffusion plate 1〇3 and the prism sheet 1〇4 are sequentially disposed on the top of the plurality of side walls 1013. The reflecting plate 1〇2 is a small frame structure which can be disposed inside the frame 101. A through hole (not shown) corresponding to the light emitting diode 105 is opened at the bottom of the reflecting plate 1〇2, and the light emitting portion 1051 of the light emitting diode 1Q5 passes through the corresponding through hole. The base 丨〇53 of the light-emitting diode 1〇5 holds the reflector 102. During operation, the light generated by the light-emitting diode 105 is reflected by the reflector 1〇2 into the diffusion plate 103, and is diffused in the diffusion plate 1〇3. After the uniform diffusion, the light continues to enter the cymbal 104. Under the action of the prism sheet 1 〇 4, the emitted light is concentrated to a certain extent, so that the backlight module 1 is bright within a certain viewing angle range 096116812 Form No. A0101 Page 3 / A total of 19 pages 1003221544-0 [0005] [0005] 1360696 [0006] [0007] [0008] 096116812 j 100 years. June 21 repair Ε Ε replacement page degree increase. However, since the light-emitting diodes 105 are point light sources, the distances reaching the diffusing plates 103 are not equal, and the unit of the diffusing plate 103 located directly above the light-emitting diodes 105 receives more light and is located at the light-emitting poles. The unit area of the diffusion plate 103 around the tube 105 receives less light, so it is easy to emit light. The area directly above the diode 105 forms a *3⁄4 area, and the peripheral area-domain above it forms a dark area, affecting the backlight module. 100 light uniformity. For this reason, it is generally necessary to provide a reflection sheet 106 above the light-emitting diode 105 to control the amount of light emitted directly above the light-emitting diode 105. The combination of the light-emitting diode 105 and the reflective sheet 106 can weaken the bright area directly above the light-emitting diode 105 to some extent. However, the backlight module 100 still has the disadvantage of uneven light output. SUMMARY OF THE INVENTION In view of the above circumstances, it is necessary to provide a backlight module having uniform light emission and an optical plate thereof. An optical plate comprising at least one optical plate unit, the optical plate unit comprising a light emitting surface, a bottom surface opposite to the light emitting surface, and a scattering layer formed on the light emitting surface, the scattering layer being disposed around the light source receiving portion and spaced apart The bottom surface is formed with a plurality of spherical grooves, and at least one light source receiving portion is opened. A backlight module includes a frame, at least one side light point source, and an optical plate; the frame includes a bottom plate and a plurality of interconnecting sidewalls extending from an edge of the bottom plate, the plurality of sidewalls forming a cavity with the bottom plate; At least one point light source having a light exiting portion is disposed on the surface of the bottom plate; the optical plate is disposed in the cavity, the optical plate includes at least one optical plate unit, and the optical plate unit includes a light emitting surface and a bottom surface opposite to the light emitting surface, The bottom surface forms the form number Α0101 Page 4 / Total 19 pages 1003221544-0 1360696
Ido年.06月21日按正_頁 有複數球形凹槽’且叫有至少1祕^ 光學板還包括-形成於該出光面之散射層，該散射層環 繞該光源容納部設置且間 为佈，該點光源之出光部相 應設置於該光源容納部内。 [0009] [0010] [0011] 上述背光模組之光學板包括光源容納部、出光面形成一 散射層、底面形成複數球形凹槽以及點光源之出光部容 、.内在光源令納冑從點光源發出之光線通過光源容納部 之内侧壁直接進人光學板内部。由於光學板之底面設置 有球形凹槽，料原來在未設有__之光學板内全 反射傳播之紐可被其調節後從底面出射，在框架底板 作用下，此部分光線多次折射後進入散射層進行進一步 散射，最後從腔體開口均勻出射，因此背光模組之光學 利用率可得到進一步提高。由於採用侧光式點光源，點 光源所發射之光線大部分於光學板内向四周傳播，點光 源被轉變成面光源。故，背光模組在採用較少之點光源 數量情況下’可進行降低之燈箱高度之設計；而且採用 此具有散射層之導光板之背光模組可省略習知擴散板之 使用，從而背光模組可以有效減少成本與降低厚度。 【實施方式】 下面將結合附圖及實施例對本發明之背光模組及其光學 板作進一步之詳細說明β 請參見圖2，所示為本發明較佳實施例一之背光模組2 〇 〇 ’其包括一框架21、一反射板22、一側光式點光源2 5及 一塊光學板20。框架21包括一塊長方形底板211及四個從 底板211邊緣向其同一側垂直延伸並相互連接之側壁213 096116812 表單編號Α0101 第5頁/共19頁 1003221544-0 1360696 100年.06月21日接正替k頁 。四侧壁213與底板211共同形成一腔體217，用於收容 點光源25、反射板22及光學板20等元件。 [0012] 請參見圖3，光學板20為與框架21之底板211相搭配之矩 形板’其包括一出光面202、一與出光面2〇2相對之底面 203 ’以及一覆蓋出光面202之具有均勻厚度之散射層 204。底面203中央開設有一光源容納部205，而且底面 2 0 3形成複數圍繞光源容納部2 0 5之球形凹槽2 〇 6。光源 容納部205為從底面203向内凹陷之盲孔。該複數球形凹 槽2 0 6呈規則之陣列式排佈。每個球形凹槽2 〇 6之球面半 徑R之取值範圍為〇. 01毫米至2毫米；每個球形凹槽206 之深度之取值範圍為大於0. 01毫米且小於或等於其球面 半徑R »相鄰球形凹槽20&之間距P之取值範圍為： PS4R »本實施例中，每個球形凹槽2〇6為半球形凹槽。 [0013] 散射層204由擴散油墨固化而成’其包括透明樹脂2042和 均勻摻雜在透明樹脂2042中之散射粒子2044。透明樹脂 2042為擴散油墨中之清漆固化而成，優選丙烯酸樹脂清 漆。散射粒子2044以一定比例摻入擴散油墨中，其可選 自以下之一種或多種粒子：二氧化矽顆粒、聚曱基丙烯 酸曱酯顆粒和玻璃微珠等。 [0014] 096116812 請再參閱圖2，側光式點光源25優選為側光式發光二極體 ’其包括一基部253，一固定於基部253上方之出光部 251與—反射片255。點光源25通過電路板（圖未示）固 定於底板211。光學板20設置在腔體217内，其出光面 202面向腔體217開口。點光源25之出光部251容納於光 學板20之光源容納部2〇5内。反射片255設置在散射層 表單编Sfe A0101 第 6 頁/共 19 頁 1003221544-0 1360696 「 ___ 100‘06为21日核正替换頁 2 0 4對應點光源2 5正上方之位置’用於覆蓋點光源2 5之頂 部。反射片255之面積等於或略大於出光部251之投影面 積。反射板22開設有一對應於點光源25之出光部251之通 孔（未標示）。反射板22設置在光學板2〇底面2〇3之下方 ’點光源25之出光部251穿過該通孔（未標示）。 [0015] 點光源25從出光部251發出之光線通過光源容納部2〇5之 内側壁直接進入光學板20内部。由於光學板2〇之底面設 置有球形凹槽206 ’部分原來在未設有球形凹槽2〇6之光 學板20内全反射傳播之光線可被其調節後從底面2〇3出射 ，在反射板22之輔助作用下，此部分光線多次折射後進 入散射層204進一步散射，最後從腔體217開口均勻出射 。因此背光模組200之光學利用率也將進一步提高。更進 一步地，由於採用側光式點光源25，點光源25所發射之 光線大部分於光學板20内向四周傳播，點光源被轉變成 面光源。因此，背光模組2〇〇在採用較少之點光源數量情 況下’可進行降低之燈箱高度之設計，從而背光模組2〇〇 可以有效減少成本與降低厚度。 [0016] 背光模組還可包括一透明板（圖未示），用於封蓋腔 體217之開口’也可另外增加一擴散板（圖未示）或/和 一稜鏡片（圖未示）’用於提高該背光模組2〇〇在特定之 視角範圍内具有較高之均勻亮度。為使光束於腔體内均 勻混光和提高光線利用率，該反射板22可進一步包括複 數反射側壁223。另外需要強調：本實施例之反射板22可 省略’尤其當框架21為高反射材料製成，或在底板211及 /或側壁213内側塗覆高反射塗層時。另外，本實施例中 096116812 表單编號A0101 第7頁/共19頁 1003221544-0 1360696 100年.06月21日修正替#頁 之光源容納部205可設計為貫穿出光面202和底面203之 通孔，與該光源容納部205相搭配，點光源25之反射片 255可直接設置於出光部251之頂部。本實施例中之反射 片255並非點光源25之必要元件，側光式點光源25可採用 其他減少從其頂部出射光束之其他設計，如於其頂部塗 覆反射層等等。 [0017] 請參見圖4，所示為本發明較佳實施例二之背光模組3〇〇 。背光模組300與較佳實施例—之背光模組200相似，其 區別僅在於光學板30與光學板2〇不同。該光學板3〇之散 射層304為不連續分佈《本實施例中，散射層3〇4為網點 狀不規則排佈。 [0018] 請參見圖5，所示為本發明較佳實施例三之光學板4〇。光 學板40與較佳實施例一之光學板2〇相似，其區別僅在於 光學板40之底面403之球形凹槽4〇6分佈不同。本實施例 中，該複數球形凹槽406以光源容納部405為中心，相互 間緊密排佈》 [0019] 請參見圖6，所示為本發明較佳實施例四之光學板5〇。光 學板50與較佳實補—之光學板脚似其區別僅在於 光學板50之底面503之球形凹槽5〇6分佈不同。本實施例 中’該複數球形凹槽506在光源容納部5〇5之周圍隨機分 佈。 球形凹槽分佈越密，採用該光學板之背光模組之光學利 用率越高。可以理解，本發明絲板之複數球形凹槽之 刀佈並不限於上述實施例所述，例如，該複數球形凹槽 096116812 表單編號A0101 第8頁/共19頁 1003221544-0 [0020] 1360696 100年.06月21-日修正替換頁 呈緊密之陣列排佈或間隔之陣列排佈。 [0021] 上述實施例中，光學板20，30，40，50都為一整體結構 。本發明之大尺寸之光學板可由複數上述整體結構之光 學板單元組合而成，或者每個光學板單元開設複數光源 容納部。除了光學板20，30，40，50之形狀為矩形外， 還可為多邊形或圓形等。 [0022] 本發明之光學板單元或組合光學板可設置複數光源容納 部，配合該複數光源容納部，可採用不同顏色之側光式 發光二極體製成白光混光背光模組，或者採用相同顏色 之側光式發光二極體製成特定顏色之背光模組。 [0023] 上述實施例中光學板20，30之散射層204，304分佈還可 以有以下變換設計。 [0024] 如圖7所示，散射層704在出光面702之分佈為：以光源容 納孔705為圓心，複數圓環狀之散射層704間隔分佈，且 越遠離光源容納孔705，圓環狀之散射層704之徑向厚度 越大，此設計有利於提高光學板之出光均勻性。 [0025] 如圖8所示，散射層804在出光面802之分佈為：以光源容 納孔805為圓心，複數網點狀之散射層804沿著圓環形軌 道間隔分佈，且越遠離光源容納孔805，網點狀之散射層 804之直徑越大面積也越大，此設計有利於提高光學板之 出光均勻性。 [0026] 如圖9所示，散射層904在出光面902之分佈為：以光源容 納孔905為圓心，複數相同大小之網點狀之散射層904沿 著圓環形軌道間隔分佈，且越遠離光源容納孔905，網點 096116812 表單編號A0101 第9頁/共19頁 1003221544-0 1360696 100年.06月21日修正替換頁 狀之散射層904之排佈密度越大，此設計有利於提高光學 板之出光均勻性。 [0027] 綜上所述，本發明確已符合發明專利要件，爰依法提出 專利申請。惟，以上所述者僅為本發明之較佳實施例， 舉凡熟悉本案技藝之人士，於援依本案發明精神所作之 等效修飾或變化，皆應包含於以下之申請專利範圍内。 【圖式簡單說明】 [0028] 圖1係一種習知之背光模組之結構示意圖。 [0029] 圖2係本發明較佳實施例一之背光模組之剖面示意圖。 [0030] 圖3係圖2所示背光模組之光學板之立體圖。 [0031] 圖4係本發明較佳實施例二之背光模組之剖面示意圖。 [0032] 圖5係本發明較佳實施例三之光學板之球形凹槽分佈示意 圖。 [0033] 圖6係本發明較佳實施例四之光學板之球形凹槽分佈示意 圖。 [0034] 圖7至圖9係本發明之光學板之散射層之各種分佈示意圖 〇 【主要元件符號說明】 [0035] 背光模組：200, 300 [0036] 光學板：20, 30, 40, 50 [0037] 框架：21 [0038] 反射板：22 096116812 表單編號A0101 第10頁/共19頁 1003221544-0 1360696 100年.06月21日按正替換頁 [0039] 側光式點光源：25 [0040] 出光面：202 1 [0041] 底面：203, 403, 503 [0042] 散射層：204, 304 [0043] 光源容納部：205, 405, 505 [0044] 球形凹槽：206, 406, 506 [0045] 底板：211 [0046] 側壁：21 3 [0047] 腔體：21 7 [0048] 透明樹脂：2042 [0049] 散射粒子：2044 [0050] 基部：253 [0051] 出光部：251 [0052] 反射片：255 096116812 表單編號A0101 第11頁/共19頁 1003221544-0Ido year. June 21st, according to the positive _ page has a plurality of spherical grooves 'and called at least 1 secret ^ The optical plate further includes a scattering layer formed on the light-emitting surface, the scattering layer is disposed around the light source receiving portion and The cloth, the light exiting portion of the point light source is correspondingly disposed in the light source receiving portion. [0011] [0011] The optical plate of the backlight module includes a light source receiving portion, a light emitting surface forming a scattering layer, a bottom surface forming a plurality of spherical grooves, and a light source portion of the point light source, and the inner light source is configured to receive the light from the point. The light emitted by the light source directly enters the inside of the optical plate through the inner side wall of the light source receiving portion. Since the bottom surface of the optical plate is provided with a spherical groove, the original reflection of the total reflection in the optical plate not provided with __ can be adjusted and then emitted from the bottom surface, and the portion of the light is refracted multiple times under the action of the frame bottom plate. The scattering layer is further scattered and finally emitted uniformly from the cavity opening, so the optical utilization of the backlight module can be further improved. Due to the use of the edge-light point source, most of the light emitted by the point source propagates around the optical plate, and the point source is converted into a surface source. Therefore, the backlight module can reduce the height of the light box when using a small number of point sources; and the backlight module using the light guide plate with the scattering layer can omit the use of the conventional diffusion plate, thereby using the backlight module. Groups can effectively reduce costs and reduce thickness. Embodiments of the present invention will be further described in detail with reference to the accompanying drawings and embodiments. FIG. 2 shows a backlight module 2 according to a preferred embodiment of the present invention. 'It includes a frame 21, a reflecting plate 22, a side light point source 25 and an optical plate 20. The frame 21 includes a rectangular bottom plate 211 and four side walls 213 096116812 extending perpendicularly from the edge of the bottom plate 211 to the same side thereof and connected to each other. Form No. 1010101 Page 5 of 19 pages 1003221544-0 1360696 100 years. June 21st For k pages. The four side walls 213 and the bottom plate 211 together form a cavity 217 for accommodating elements such as the point source 25, the reflecting plate 22, and the optical plate 20. [0012] Referring to FIG. 3, the optical plate 20 is a rectangular plate collocated with the bottom plate 211 of the frame 21, which includes a light exiting surface 202, a bottom surface 203' opposite to the light exiting surface 2'2, and a light emitting surface 202. A scattering layer 204 having a uniform thickness. A light source accommodating portion 205 is defined in the center of the bottom surface 203, and the bottom surface 203 forms a plurality of spherical grooves 2 〇 6 surrounding the light source accommodating portion 205. The light source housing portion 205 is a blind hole that is recessed inward from the bottom surface 203. The plurality of spherical recesses 206 are arranged in a regular array. The spherical radius R of each spherical groove 2 〇6 ranges from 毫米. 01 mm to 2 mm; the depth of each spherical groove 206 ranges from greater than 0.01 mm and is less than or equal to its spherical radius. R » The distance between adjacent spherical grooves 20 & P ranges from: PS4R » In this embodiment, each spherical groove 2〇6 is a hemispherical groove. [0013] The scattering layer 204 is cured by a diffusion ink, which includes a transparent resin 2042 and scattering particles 2044 uniformly doped in the transparent resin 2042. The transparent resin 2042 is formed by curing a varnish in the diffusion ink, and is preferably an acrylic resin varnish. The scattering particles 2044 are incorporated into the diffusion ink in a ratio selected from one or more of the following particles: cerium oxide particles, polydecyl methacrylate particles, and glass beads. [0014] 096116812 Referring again to FIG. 2, the edge-light point source 25 is preferably an edge-lit LED "> which includes a base 253, a light-emitting portion 251 and a reflection sheet 255 fixed above the base 253. The point light source 25 is fixed to the bottom plate 211 through a circuit board (not shown). The optical plate 20 is disposed within the cavity 217 with its light exit surface 202 facing the cavity 217 opening. The light exit portion 251 of the point light source 25 is housed in the light source housing portion 2A5 of the optical plate 20. The reflection sheet 255 is set in the scattering layer form Sfe A0101 Page 6 of 19 1003221544-0 1360696 " ___ 100'06 is the 21st nuclear replacement page 2 0 4 corresponding point light source 2 5 directly above position 'for coverage The top of the point light source 25. The area of the reflection sheet 255 is equal to or slightly larger than the projected area of the light exit portion 251. The reflection plate 22 defines a through hole (not shown) corresponding to the light exit portion 251 of the point source 25. The reflection plate 22 is disposed at The light exiting portion 251 of the point light source 25 passes through the through hole (not shown). [0015] The light emitted from the light exit portion 251 by the point light source 25 passes through the inner side of the light source housing portion 2〇5. The wall directly enters the interior of the optical plate 20. Since the bottom surface of the optical plate 2 is provided with a spherical recess 206' part of the original light that is totally reflected in the optical plate 20 not provided with the spherical recess 2〇6 can be adjusted by the light The bottom surface 2〇3 is emitted, and under the auxiliary action of the reflecting plate 22, the portion of the light is refracted multiple times and then enters the scattering layer 204 to be further scattered, and finally is uniformly emitted from the opening of the cavity 217. Therefore, the optical utilization ratio of the backlight module 200 will further Improve Step by step, since the edge light source 25 is used, most of the light emitted by the point source 25 propagates around the optical plate 20, and the point source is converted into a surface light source. Therefore, the backlight module 2 is less used. In the case of the number of point light sources, the design of the height of the light box can be reduced, so that the backlight module 2 can effectively reduce the cost and reduce the thickness. [0016] The backlight module can further include a transparent plate (not shown) for The opening of the capping cavity 217 can also be additionally provided with a diffusing plate (not shown) or/and a blip piece (not shown) for improving the backlight module 2 in a specific viewing angle range. High uniform brightness. In order to uniformly mix the light beam in the cavity and improve light utilization, the reflector 22 may further include a plurality of reflective sidewalls 223. It is further emphasized that the reflector 22 of the present embodiment may be omitted, especially when the frame 21 is made of a highly reflective material, or is coated with a highly reflective coating on the inside of the bottom plate 211 and/or the side wall 213. In addition, in the present embodiment, 096116812 Form No. A0101 Page 7 / 19 pages 1003221544-0 1360696 100 years .06 The light source accommodating portion 205 of the ninth page can be designed as a through hole penetrating the light emitting surface 202 and the bottom surface 203. The light source accommodating portion 205 can be directly disposed on the top of the light exit portion 251. The reflective sheet 255 in this embodiment is not an essential component of the point source 25, and the edge-lit point source 25 may employ other designs that reduce the beam exiting from the top thereof, such as a reflective layer applied to the top thereof, etc. [0017] Referring to FIG. 4, a backlight module 3A according to a second embodiment of the present invention is shown. The backlight module 300 is similar to the backlight module 200 of the preferred embodiment, except that the optical plate 30 is different from the optical plate 2A. The scattering layer 304 of the optical plate 3 is discontinuously distributed. In the present embodiment, the scattering layer 3〇4 is a dot-like irregular arrangement. Referring to FIG. 5, an optical plate 4A according to a third embodiment of the present invention is shown. The optical plate 40 is similar to the optical plate 2A of the preferred embodiment 1 except that the spherical grooves 4〇6 of the bottom surface 403 of the optical plate 40 are differently distributed. In this embodiment, the plurality of spherical recesses 406 are centered on the light source receiving portion 405 and are closely arranged with each other. [0019] Referring to FIG. 6, there is shown an optical plate 5 of the fourth embodiment of the present invention. The optical plate 50 is similar to the preferred optical complement of the optical plate only in that the spherical grooves 5〇6 of the bottom surface 503 of the optical plate 50 are distributed differently. In the present embodiment, the plurality of spherical grooves 506 are randomly distributed around the light source housing portion 5〇5. The denser the spherical groove distribution, the higher the optical utilization of the backlight module using the optical plate. It can be understood that the knives of the plurality of spherical grooves of the wire plate of the present invention are not limited to the above embodiments, for example, the plurality of spherical grooves 096116812 Form No. A0101 Page 8 / Total 19 pages 1003221544-0 [0020] 1360696 100 On June 21st, the revised replacement page is arranged in a tight array or array of spaces. [0021] In the above embodiment, the optical plates 20, 30, 40, 50 are all of a unitary structure. The large-sized optical plate of the present invention may be composed of a plurality of optical plate units of the above-described overall structure, or each of the optical plate units may be provided with a plurality of light source housing portions. In addition to the shape of the optical plates 20, 30, 40, 50 being rectangular, they may be polygonal or circular. [0022] The optical plate unit or the combined optical plate of the present invention may be provided with a plurality of light source accommodating portions, and the light source illuminating diodes of different colors may be used to form a white light mixed light backlight module, or The sidelight type light emitting diodes of the same color are made into a backlight module of a specific color. [0023] The scattering layers 204, 304 of the optical plates 20, 30 in the above embodiment may also have the following transformation design. [0024] As shown in FIG. 7, the distribution of the scattering layer 704 on the light-emitting surface 702 is such that the light-source accommodating hole 705 is centered, and the plurality of annular scattering layers 704 are spaced apart from each other, and are further away from the light source accommodating hole 705. The larger the radial thickness of the scattering layer 704, the better the uniformity of the light output of the optical plate. [0025] As shown in FIG. 8, the distribution of the scattering layer 804 on the light-emitting surface 802 is centered on the light-receiving receiving hole 805, and the plurality of dot-like scattering layers 804 are spaced along the circular orbital path, and the farther away from the light source receiving hole. 805, the larger the diameter of the dot-like scattering layer 804 is, the larger the area is. This design is beneficial to improve the light uniformity of the optical plate. As shown in FIG. 9 , the distribution of the scattering layer 904 on the light-emitting surface 902 is: centered on the light source receiving hole 905, and a plurality of dot-like scattering layers 904 of the same size are spaced along the circular orbit, and the further away Light source accommodating hole 905, dot 096116812 Form No. A0101 Page 9/19 pages 1003221544-0 1360696 100 years. On June 21, the larger the arrangement density of the replacement page-like scattering layer 904 is, the design is advantageous for improving the optical plate. Light uniformity. [0027] 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 the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS [0028] FIG. 1 is a schematic structural view of a conventional backlight module. 2 is a cross-sectional view of a backlight module according to a preferred embodiment of the present invention. 3 is a perspective view of an optical plate of the backlight module shown in FIG. 2. 4 is a cross-sectional view of a backlight module according to a second embodiment of the present invention. 5 is a schematic view showing a spherical groove distribution of an optical plate according to a third preferred embodiment of the present invention. 6 is a schematic view showing the distribution of spherical grooves of an optical plate according to a fourth preferred embodiment of the present invention. 7 to FIG. 9 are schematic diagrams showing various distributions of scattering layers of the optical plate of the present invention. [Main component symbol description] [0035] Backlight module: 200, 300 [0036] Optical plate: 20, 30, 40, 50 [0037] Frame: 21 [0038] Reflector: 22 096116812 Form No. A0101 Page 10 / Total 19 Page 1003221544-0 1360696 100 years. June 21 Press Positive Replacement Page [0039] Sidelight Point Light Source: 25 [0040] Light-emitting surface: 202 1 [0041] bottom surface: 203, 403, 503 [0042] scattering layer: 204, 304 [0043] light source housing: 205, 405, 505 [0044] spherical groove: 206, 406, 506 [0045] Base plate: 211 [0046] Side wall: 21 3 [0047] Cavity: 21 7 [0048] Transparent resin: 2042 [0049] Scattering particles: 2044 [0050] Base: 253 [0051] Light exit: 251 [ 0052] Reflector: 255 096116812 Form No. A0101 Page 11 of 19 1003221544-0