201015128 九、發明說明： 【發明所屬之技術領域】 本發明關於一種導光板及具有該導光板之背光模組。 - 【先前技術】 請參閱第1圖，第1圖為習知一背光模組10之立體 〇 分解圖。背光模組10主要包含有一背板11 ;以及設於背 板 11 内的一導光板（light guide plate，LGP)12、一反射片 一光源14、一逆棱鏡片15及一光學膜16。光學膜16 鄰近逆稜鏡片15的出光側，反射片13鄰近導光板12之 下表面122，光源14設於導光板12之側入光面124，光 源14所發出的光線自侧入光面ι24入射至導光板I]内， 再由導光板12之上表面121離開。於下表面122形成有 複數V型溝槽123,利用V型溝槽123可將光線轉折至上 〇 表面121。上表面121形成霧面微結構（圖未示），使光線 能以65-75度的角度離開導光板12。逆稜鏡片15鄰近導 ' 光板12之上表面12卜用以將入射至其内的上述65_75度 光線導向正視角方向。 上述之習知背光模組1〇雖然具有良好的輝度，但明 顯有如下缺點： |、習知背光模組10其導光板12之上表面121採用 霧面微結構設計，然而於製造霧面微結構時其轉寫率通常 6 201015128 不佳（於此轉寫率定義為導光板Η成型後的上表面121的 微結構數目與模仁表面的微結構數目的比率）。 2 '習知背光模組1〇之上表面121的霧面微結構與下 _表面的v型溝槽123，於製造時為搭配逆稜鏡片15而有明 ' 顯的加工限制。 ^ ^ 3 S知背光模組10其靠近光源14的側畫面區域通 ® :儿度不均勻’特別是使用例如發光二極體（LED )之點 光源作為側光源時，靠近光源14的一側容易產生對比明 顯的V形亮/暗帶分佈現象。 【發明内容】 本發明S供一種製程穩定性較高且㉟避纟入光側光 均勾度不佳現象的導光板及背光模組。[Technical Field] The present invention relates to a light guide plate and a backlight module having the same. - [Prior Art] Please refer to Fig. 1. Fig. 1 is a perspective exploded view of a conventional backlight module 10. The backlight module 10 mainly includes a back plate 11 and a light guide plate (LGP) 12 disposed in the back plate 11, a reflective sheet, a light source 14, a reverse prism sheet 15, and an optical film 16. The optical film 16 is adjacent to the light exiting side of the reverse cymbal sheet 15, the reflective sheet 13 is adjacent to the lower surface 122 of the light guide plate 12, and the light source 14 is disposed on the side light incident surface 124 of the light guide plate 12. The light emitted by the light source 14 is from the side light entrance surface ι24. It is incident on the light guide plate I], and is separated from the upper surface 121 of the light guide plate 12. A plurality of V-shaped grooves 123 are formed in the lower surface 122, and the V-shaped grooves 123 are used to deflect the light to the upper surface 121. The upper surface 121 forms a matte microstructure (not shown) that allows light to exit the light guide plate 12 at an angle of 65-75 degrees. The reverse cymbal 15 is adjacent to the upper surface 12 of the light guide 12 for directing the above-mentioned 65_75 degrees of light incident thereto into the positive viewing direction. Although the above-mentioned conventional backlight module 1 has good brightness, it has the following disadvantages: | The conventional backlight module 10 has a matte surface design on the upper surface 121 of the light guide plate 12, but the matte surface is manufactured. The transfer rate of the structure is usually 6 201015128 (this transfer rate is defined as the ratio of the number of microstructures of the upper surface 121 after the light guide plate is formed to the number of microstructures on the surface of the mold). 2 'The matte surface microstructure of the upper surface 121 of the conventional backlight module 1 and the v-shaped groove 123 of the lower surface are formed by the retroreflective sheet 15 at the time of manufacture. ^ ^ 3 S backlight module 10 is adjacent to the side of the light source 14 through the area: the unevenness of the 'in particular', especially when using a point source such as a light-emitting diode (LED) as the side light source, close to the side of the light source 14 It is easy to produce a contrasting V-shaped light/dark band distribution phenomenon. SUMMARY OF THE INVENTION The present invention provides a light guide plate and a backlight module with high process stability and 35 avoiding the phenomenon that the light side light is poorly hooked.
依本發明一實施例之設計，一種適於引導一光線沿一 第：方向行進之導光板包含一第一表面、一第二表面、一 ^光面及複數第—柱狀結構。人光面連接第—表面及第二 且光線自入光面入射至導光板内。複數第一柱狀結 各自的長軸方向大致平行第—方向的方式排列於第 -表面。每—柱狀結構具有相對I表面凸出的一曲面， 且該曲面上形成有至少一沿第一方向延伸之凹槽。 :-實施例中’凹槽由一第—弧面、一第二弧面及連 接於第-弧面及第二弧面間的一第一底面所界定，且第一 ❹ 〇 201015128 狐面、第二弧面及第-底面係沿第一方向延伸。 於-㈣財，導^更包麵㈣二 =柱狀結構以各自的長轴方向大致平行-第二方: 的方式排列於第二表面，1中 方玲 /、r第方向垂直於第二方向。 於-實施例中，凹槽沿大致垂直於第一方向 _ :向切割的-剖面的輪摩包含一第一曲線、一第二曲 =接於該第一曲線及該第二曲線間的-第三曲線，第—曲 :及!二:線凸出於第-表面，且第三曲線朝第一表面: ::槽於第一方向上的不同位置沿第二方向切割出多 深度可隨該不同位置㈠朝第一表面凹陷的 ^罝/〇第一方向先遞增後遞減地變化，使 每—柱狀結構的頂部形成至少—凹陷結構。 於—實施财，凹槽沿大致垂直一 方向切割的—乌丨& & & + 町弟一 連接於二包含一第一曲線、一第二曲線及 線凸出於第_、矣線的一直線’第一曲線及第二曲 凹槽於第—面的兩度大於直線距第一表面的高度。當 面時， 方向上的不同位置沿第二方向切割出多個剖 同位置ΓΓ::的：廓之直線距第一表面的高度可隨該不 構。 1之母一柱狀結構的頂部形成至少一凹陷結 第二Ζ實施例中，每一柱狀結構更包含一第一斜面及一 ' 第斜面連接於第一弧面及第一表面間，且第 201015128 二斜面連接於第二弧面及第一表面間。 依本發明另一實施例之設計，一種背光模組包含一背 板、一光源、一導光板及一反射片。背板具有至少一侧邊 及一連接於側邊的底面，且光源設置於背板内並鄰近侧 邊。導光板包含一第一表面、一第二表面、一入光面及複 數第柱狀結構。入光面連接第一表面及第二表面，且光 Ο 線自入光面入射至導光板内。複數柱狀結構以各自的長轴 方向大致平行第一方向的方式排列於第一表面。每一第一 柱狀結構具有相對第一表面凸出的一曲面，且該曲面上形 成有至少一沿第一方向延伸之凹槽。反射片置於背板的底 面與導光板的第二表面間。 基於上述各個實施例之設計’因每一柱狀結構具有一 大致平行光傳遞方向設置的第一及第二弧面來界定出一 凹槽，如此可使光線離開導光板後更容易向柱狀結構的兩 〇 側擴散’減輕入光側亮/暗帶交替分佈的亮度不均現象《此 外，柱狀結構可更包含至少一凹陷結構，使光線離開導光 - 板後更容易向柱狀結構的兩側擴散。此外，可於導光板的 不同區域設置不同密度的凹陷結構，來調整背光模組的能 量分布，使背光模組之亮度更為均勻。再者，利用調整第 弧面及第二弧面之曲率，可控制光線離開導光板後再向 柱狀結構兩側散射的角度，藉以更有效地減少亮/暗帶交替 分佈現象。 9 201015128 【實施方式】 彳關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之實施例的詳細說明中，將可清楚的呈 •現。以下實施例中所提到的方向用語，例如：上、下、左、 右月】或後等，僅疋參考附加圖式的方向。因此，使用的 Ο 方向用語是用來說明並非用來限制本發明。 第2圖為顯示設有依本發明一實施例之導光板的背光 模組立體分解圖，第3圖為顯示沿帛2m，線的導光 板剖面示意圖。 明同時參考第2及第3圖，背光模組2〇包含一背板 21、-光源24、一導光板22及一反射片23。背板21具 有圍成矩形的四個侧面211及一連接該些侧面211的底面 212。光源24可為圖示之冷陰極燈管（cCFL)，或者亦可 Ο 為至少一發光二極體（LED)等等。光源24設置於背板21 _内並鄰近其中一側面211，且朝導光板22發出一光線1〇, - 導光板22設置於背板21内並鄰近光源24。導光板22具 有一第一表面221、一第二表面222、一入光面223、複數 V型溝槽250及複數柱狀結構26〇。第二表面222與第一 表面221分別位於導光板22的兩對側，入光面223連接 第一表面221及第二表面222且面向光源24以適於使光 線10入射至導光板22内。導光板22引導光線1〇沿一第 10 201015128 一方向41行進，以形成背光模組2 0之面光源。v型溝槽 25〇自第二表面222向導光板22内凹陷，且V型溝槽250According to an embodiment of the invention, a light guide plate adapted to guide a light beam to travel in a first direction includes a first surface, a second surface, a light surface, and a plurality of columnar structures. The human surface is connected to the first surface and the second surface, and the light is incident into the light guide plate from the light incident surface. The plurality of first columnar nodes are arranged on the first surface in such a manner that the major axis directions thereof are substantially parallel to the first direction. Each of the columnar structures has a curved surface that is convex with respect to the I surface, and the curved surface is formed with at least one groove extending in the first direction. In the embodiment, the groove is defined by a first curved surface, a second curved surface, and a first bottom surface connected between the first curved surface and the second curved surface, and the first 〇 〇 201015128 fox surface, The second curved surface and the first bottom surface extend in the first direction. In - (4), the guide is more (4) 2 = columnar structures are arranged in parallel with each other in the direction of the major axis - the second side: in the manner of the second surface, 1 in the square / / r in the direction perpendicular to the second direction . In the embodiment, the groove is substantially perpendicular to the first direction _: the wheel of the cut-section includes a first curve, a second curve = between the first curve and the second curve - The third curve, the first curve: and the second two: the line protrudes from the first surface, and the third curve faces the first surface: :: the groove is cut at a different position in the first direction, and the depth is cut along the second direction. The different positions (1) are firstly and incrementally changed toward the first direction of the first surface depression, so that at least the concave structure is formed at the top of each columnar structure. In the implementation of the fortune, the groove is cut along a substantially vertical direction - Wuhuan &&&& + The same as the second brother comprises a first curve, a second curve and a line protruding from the _, 矣 line The straight line 'the first curve and the second curved groove are two degrees above the first face greater than the straight line from the first surface. When in the face, the different positions in the direction cut a plurality of different positions in the second direction ΓΓ::: the height of the straight line from the first surface may follow the configuration. The top of a columnar structure of 1 is formed with at least one recessed junction. In the embodiment, each of the columnar structures further includes a first inclined surface and a 'the first inclined surface is connected between the first curved surface and the first surface, and The first slope of the 201015128 is connected between the second curved surface and the first surface. According to another embodiment of the present invention, a backlight module includes a back plate, a light source, a light guide plate, and a reflective sheet. The backboard has at least one side and a bottom surface connected to the side, and the light source is disposed in the back panel adjacent to the side. The light guide plate comprises a first surface, a second surface, a light incident surface and a plurality of columnar structures. The light incident surface is connected to the first surface and the second surface, and the light ray line is incident into the light guide plate from the light incident surface. The plurality of columnar structures are arranged on the first surface such that the respective major axis directions are substantially parallel to the first direction. Each of the first columnar structures has a curved surface that is convex with respect to the first surface, and the curved surface is formed with at least one groove extending in the first direction. The reflective sheet is placed between the bottom surface of the back sheet and the second surface of the light guide plate. Based on the design of each of the above embodiments, a groove is defined by the first and second arcuate surfaces of each columnar structure having a substantially parallel light transmission direction, so that the light can be more easily columned after leaving the light guide plate. The two sides of the structure diffuse to reduce the uneven brightness of the light/dark bands on the light side. In addition, the columnar structure may further comprise at least one recessed structure, so that the light is more easily moved to the columnar structure after leaving the light guide plate. The sides spread. In addition, recessed structures of different densities can be disposed in different regions of the light guide plate to adjust the energy distribution of the backlight module, so that the brightness of the backlight module is more uniform. Furthermore, by adjusting the curvature of the curved surface and the second curved surface, the angle at which the light leaves the light guide plate and then scatters to both sides of the columnar structure can be controlled, thereby effectively reducing the alternating distribution of light/dark bands. [Embodiment] The foregoing and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the embodiments of the invention. The directional terms mentioned in the following embodiments, such as: up, down, left, right month, or after, only refer to the direction of the additional drawing. Therefore, the use of the directional term is used to describe that it is not intended to limit the invention. Fig. 2 is an exploded perspective view showing a backlight module provided with a light guide plate according to an embodiment of the present invention, and Fig. 3 is a schematic cross-sectional view showing a light guide plate along a line 2m. Referring to FIGS. 2 and 3 simultaneously, the backlight module 2 includes a back plate 21, a light source 24, a light guide plate 22, and a reflection sheet 23. The back plate 21 has four side faces 211 enclosing a rectangle and a bottom surface 212 connecting the side faces 211. Light source 24 can be a cold cathode fluorescent tube (cCFL) as shown, or can be at least one light emitting diode (LED) or the like. The light source 24 is disposed in the back plate 21 _ and adjacent to one of the side surfaces 211 , and emits a light 1 朝 toward the light guide plate 22 . The light guide plate 22 is disposed in the back plate 21 and adjacent to the light source 24 . The light guide plate 22 has a first surface 221, a second surface 222, a light incident surface 223, a plurality of V-shaped grooves 250, and a plurality of columnar structures 26A. The second surface 222 and the first surface 221 are respectively located on opposite sides of the light guide plate 22, and the light incident surface 223 connects the first surface 221 and the second surface 222 and faces the light source 24 to make the light 10 enter the light guide plate 22. The light guide plate 22 guides the light beam 1 to travel along a direction 10 of the 10th 201015128 to form a surface light source of the backlight module 20. The v-shaped groove 25 is recessed from the second surface 222 into the light guide plate 22, and the V-shaped groove 250
係用以將光線10轉折至導光板22的第一表面221。且V 型溝槽250的長軸方向垂直於柱狀結構260的長軸方向。 各個柱狀結構260以其長軸方向大致平行第一方向41的 方式排列於第'一表面221。如第3圖所示，每一柱狀結構 260具有相對第一表面221凸出之一曲面s，且曲面8上 形成有一沿第一方向41延伸分佈之凹槽丁。 第4圖為顯示依本發明一實施例之柱狀結構的局部放 大不意圖。如第4圖所示，柱狀結構260相對一第一表面 221凸出的曲面s包含一第一弧面267、一第二弧面Mg、 —第一底面269、一第一斜面263及一第二斜面2M，其 第弧面267、第一弧面268及第一底面269沿第一方 向41延伸6又置且界定出沿第一方向4丨延伸分佈之凹槽 丁。第一底面209連接於第一弧面267及第二弧面268間， 第—底面269可如第4圖所示為一曲面，或者亦可為一平 一第-斜面263連接於第—狐面267及第一表面221間， 斜面2M連接於第二弧面268及第一表面間。 構分:沿5第A 一及及5B第圖=本發明另一州^ 及弟—方向的剖面示意圖。柱狀結構26〇並 光板U成於第7表面22卜例如第5A及5B圖所示之導 更包含形成於第二表面的複數下柱狀結構260a。 11 201015128 於-實施例中，導光板22,可以同時包含形成於第一表面 221的複數柱狀結構26〇及形成於第二表面222的複數下 柱狀結構260a，且下柱狀結構26〇a的長轴方向垂直於柱 狀結構260的長軸方向。或者，導光板僅包含形成於第二 ' 表面222的複數下柱狀結構260a亦可。於一實施例中，柱 狀結構260的結構可以相同於下柱狀結構26〇a的結構。 〇 第6A圖為顯示依本發明另一實施例之柱狀結構的局 部放大圖，第6B圖為沿第6A圖之Le線的剖面圖。請參 考第6A及第6B圏，於本實施例中，凹槽τ(由第—弧面 267、第一弧面268及第一底面269所界定出）沿一第二方 向42(大致垂直第一方向41)切割的剖面的輪廓包含一第 一曲線621、一第二曲線622、及一連接於第一曲線62ι 及第二曲線622間的第三曲線623。第一曲線621 '第二 曲線622分別凸出於第一表面221，第三曲線623則朝第 Q 一表面221凹陷。較佳地，該些曲線可為圓弧曲線。第一 曲線62 1及第二曲線623間形成一第一反曲點ν ;第二曲 . 線622及第三曲線623間形成一第二反曲點Μ。於—實施 例中，當凹槽於第一方向41上的不同位置沿第二方向42 切割出多個剖面時，各個剖面的輪廓之第一反曲點Ν與第 二反曲點Μ間的距離霄可隨於第一方向41上的不同位置 而變化。換言之’當凹槽於第一方向41上的不同位置沿 第二方向42切割出多個剖面時，各個剖面的輪廓之第三 12 201015128 曲線623朝第一表面221凹陷的深度 上的不同位置而變化。於本實施例中於第-方向41 割的不同剖面的輪靡的第一反曲點&二方向42切 的距離W、以及第三曲線623的凹陷深度^反曲第點Μ間 41遞增後遞減地變化而於柱狀結構260,頂二：一方向 結構u。於一實施例中，每一柱狀姓構26二成-凹陷 ❹It is used to fold the light 10 to the first surface 221 of the light guide plate 22. And the long axis direction of the V-shaped groove 250 is perpendicular to the long axis direction of the columnar structure 260. Each of the columnar structures 260 is arranged on the first surface 221 such that its major axis direction is substantially parallel to the first direction 41. As shown in Fig. 3, each of the columnar structures 260 has a curved surface s protruding from the first surface 221, and the curved surface 8 is formed with a groove extending in the first direction 41. Fig. 4 is a view showing the partial enlargement of the columnar structure according to an embodiment of the present invention. As shown in FIG. 4 , the curved surface s protruding from the first surface 221 of the columnar structure 260 includes a first curved surface 267 , a second curved surface Mg , a first bottom surface 269 , a first inclined surface 263 , and a first surface 269 . The second inclined surface 2M has a curved surface 267, a first curved surface 268 and a first bottom surface 269 extending 6 in the first direction 41 and defining a groove extending along the first direction 4丨. The first bottom surface 209 is connected between the first curved surface 267 and the second curved surface 268. The first bottom surface 269 may be a curved surface as shown in FIG. 4, or may be a flat first inclined surface 263 connected to the first surface. Between the 267 and the first surface 221, the slope 2M is connected between the second curved surface 268 and the first surface. Fraction: A cross-sectional view along the direction of 5th A and 5B = another state of the present invention. The columnar structure 26 and the light plate U are formed on the seventh surface 22, for example, as shown in Figs. 5A and 5B, and include a plurality of lower columnar structures 260a formed on the second surface. 11201015128 In the embodiment, the light guide plate 22 may include a plurality of columnar structures 26〇 formed on the first surface 221 and a plurality of lower columnar structures 260a formed on the second surface 222, and the lower columnar structure 26〇 The major axis direction of a is perpendicular to the long axis direction of the columnar structure 260. Alternatively, the light guide plate may include only a plurality of lower columnar structures 260a formed on the second 'surface 222. In one embodiment, the structure of the columnar structure 260 may be the same as the structure of the lower columnar structure 26A. Fig. 6A is a partially enlarged view showing a columnar structure according to another embodiment of the present invention, and Fig. 6B is a cross-sectional view taken along line Le of Fig. 6A. Please refer to FIGS. 6A and 6B. In this embodiment, the groove τ (defined by the first curved surface 267, the first curved surface 268 and the first bottom surface 269) is along a second direction 42 (substantially vertical) The contour of the cut section in one direction 41) includes a first curve 621, a second curve 622, and a third curve 623 connected between the first curve 62ι and the second curve 622. The first curve 621 'the second curve 622 protrudes from the first surface 221, respectively, and the third curve 623 is recessed toward the Q-th surface 221 . Preferably, the curves may be arc curves. A first inflection point ν is formed between the first curve 62 1 and the second curve 623; and a second inflection point 形成 is formed between the second curve 622 and the third curve 623. In the embodiment, when the plurality of sections are cut along the second direction 42 at different positions of the groove in the first direction 41, the first inversion point 轮廓 of the contour of each section and the second inflection point The distance 霄 can vary with different locations in the first direction 41. In other words, when a plurality of sections are cut in the second direction 42 at different positions of the groove in the first direction 41, the third 12 201015128 curve 623 of the profile of each section faces a different position in the depth of the first surface 221 recessed. Variety. In the present embodiment, the first inflection point of the rim of the different sections cut in the first direction 41 & the distance W of the two directions 42 and the recessed depth of the third curve 623 are inversely increased by the reversal point 41 The structure is changed in descending order to the columnar structure 260, and the top two: a direction structure u. In one embodiment, each columnar surname is 26%-depression ❹
形成多個凹陷結構Ue凹陷社 的頂部亦可以 w陷、，、。構ϋ能夠使光線1〇 狀結構260後更為發散。於本眚 杈 的第三曲線623朝二=施例中，各該剖面的輪廊 至約5。微米之間1凹陷的深度例如介於約1 第7Α至7D圖為顯示光線1〇穿過依本發明一實施例 之柱狀、、·σ構的不意圖，且第7Α至7D圖繪出柱狀結構細 沿第二方向42切割的不同剖面。詳言之，第7八圖顯示一 剖面的輪廓的第一反曲點N與第二反曲點M間的距離w 極小不易被人眼察覺的情況，第7D圖顯示第一底面269 為一平面時的情況。第7八至7D圖之光線1〇的行徑遵守 光學之直線原理、折射原理、斯奈爾定律（Snell，s)定律 或光全反射原理等。如第7A至7D圖所示，距離w的值 愈小，光線10自柱狀結構26〇兩側離開的量較少，亦即兩 側光能量較低。距離W的距離愈大，第一曲線621及第二 曲線622能夠增加光線10自柱狀結構26〇兩側離開的量， 因此兩側光能量較高。 13 201015128The top of the Ue depression, which forms a plurality of concave structures, can also be trapped, and. The structure can make the light 1 〇 structure 260 more divergent. In the third curve 623 of Benedict 朝, in the second embodiment, the cross-section of each of the sections is about 5. The depth of the 1 recess between the micrometers is, for example, about 1 to 7th to 7D. The graph shows that the light rays 1 traverse the columnar, sigma, and sigma structures according to an embodiment of the present invention, and the 7th to 7th graphs are drawn. The columnar structure is thinned in different sections cut along the second direction 42. In detail, the seventh figure shows that the distance w between the first inflection point N and the second inflection point M of the contour of one section is extremely small and is not easily perceived by the human eye, and the 7D figure shows that the first bottom surface 269 is one. The situation at the time of the plane. The path of the light of the 7th to 7th graphs follows the principle of optical straight line, the principle of refraction, the law of Snell's law or the principle of total light reflection. As shown in Figures 7A through 7D, the smaller the value of the distance w, the smaller the amount of light 10 exiting from the sides of the columnar structure 26, i.e., the lower side of the light energy. The greater the distance from the W, the first curve 621 and the second curve 622 can increase the amount of light 10 exiting from both sides of the columnar structure 26, so that the light energy on both sides is higher. 13 201015128
第8A圖為顯示本發明另一實施例之柱狀結構的局部 放大示意圖。第8A圖所示之柱狀結構6〇2,與第3圖所示 之柱狀結構260類似’差別在於柱狀結構6〇2，不包含枝狀 結構260的第一斜面263及第二斜面264。第8B圖為顯示 本發明另一實施例之柱狀結構的局部放大示意圖。第跎 圖所示之柱狀結構602”與第7A圖所示之柱狀結構6〇2, 類似，差別在於柱狀結構602 ’形成有一凹陷結構u。 第8C圖為沿第8B圖之Lf線切割的柱狀結構剖面示 意圖。請參考第8B及8C圖，凹槽τ，（由第一弧面26/、' 第二弧面268及第一底面269界定出）其沿第二方向“切 割的剖面的輪廓包含一第一曲線621、一第二曲線及 連接於第-曲線621及第二曲線622的一直線㈣。較佳 地，曲線⑶及⑵可以為圓弧曲線，第一曲線621及第 二曲線622相較於直線624凸出於第一表面221，且 624平行第-表面221。直線似的兩端&及w分別 連接於第-曲線621及第二曲線622。當於第—方向^上 置：第二方向42切割出多個剖面時，直線624 的兩^Μ &Ν @的距離可隨於第—方向* 位置而變化或保持固定。於一實 上的不同 …的不同位置二方二列中’當凹槽於第-方 :剖面的輪廓之直…深度隨於;出一 同位置而變化，換言之，第一曲線 4二上的不 久弟一曲線622凸 14 201015128 ❹ ❹ 古^ 表面221的尚度大於直線624距第一表面221的 離％於本實施例中’直線624的兩端M，及Ν’間的距 &第一方向41遞增後遞減地變化而形成一凹陷結構 “各該d面的輪廓的直線624的深度介於約】至約$〇 5米之間’換S之’第-曲'線621凸出於第一表面221的 同度與直線624距第—表面221的高度兩者的差距η介於 約1至約50微米之間。 第9圖為顯示依本發明一實施例之背光模組的俯視示 意圖。請參考第9 ®，於本實施例中，光源24包含沿大 致平行第一方向42排列的複數發光二極體241。因為發光 一極體241為點光源，所以導光板22其鄰近兩相鄰發光 一極體241的局部區域容易產生暗區S(i和亮區S1交替出 現的現象。因上述各個實施例的導光板22包含設置於第 一表面221的複數柱狀結構26〇、26〇’、6〇2，或6〇2”，且 母一没置於第一表面221的柱狀結構包含大致平行光傳遞 方向（第一方向41)設置的一第一弧面267及一第一弧面 268 ’如此可使光線離開導光板22後較容易向柱狀結構的 兩侧擴散’減輕入光侧亮/暗帶交替分佈的亮度不均現象。 此外’設置於第一表面22 1的柱狀結構可更包含至少一凹 陷結構U，且可使第一表面221中靠近入光面223的區域 Sa形成有凹陷結構u的密度，大於第一表面221中遠離 223入光面的區域形成該些凹陷結構u的密度，以使光線 15 201015128 離開導光板22後更容易向柱狀結構的兩側擴散，亦即使 此些凹陷結構於靠近入光面之區域的分佈密度大於遠離 入光面之區域的分佈密度。此外，亦能夠依據導光板U 未设置凹陷結構U前之自第一表面22 1各區域離開之光線 ' 的能量分佈，而於各區域設置不同密度的凹陷結構ϋ，來 調整背光模組20的能量分布，使背光模組2〇之亮度更為 〇 均勻。再者，利用調整第一弧面267及第二弧面268之曲 率’可控制光線10離開導光板22後再向柱狀結構兩側散 射的角度，藉以更有效地減少亮/暗帶交替分佈現象。由於 第一弧面267及第二弧面268為平滑面，故不會導致光暈 或整體輝度下降的問題。 第10圖為顯示本發明另一實施例之柱狀結構的局部 放大不意圖。第1 〇圖所示之柱狀結構603類似於第3圖 所不之柱狀結構260，差別在於柱狀結構603具有二個凹 ❿ 槽Τ1、Τ2’因此更包含一第三弧面2681及一第二底面 2691。第三弧面2681及第二底面2691大致平行第一方向 • 41叹置’第二底面2691連接於第二弧面268及第三弧面 2681 間。 於同樣利用精密加工的製造方式下，凹陷結構U較習 知霧面微結構容易製造，因此製程穩定性較高。此外，單 位面積下凹陷結構U數量的多募可依個別的光學需求做 調整例如在暗影區域或需加強出光量的區域，可增加凹 16 201015128 陷結構u的數量β 所述，相較於習知導光板其上表面設有霧面微結 的又、十本發明之導光板實施例不僅製程穩定性較高且 ，製程良=較佳，且其具凹槽的柱狀結構可使光線離開導光 後更谷易向柱狀結構的兩侧擴散，減輕入光側光均勻度 不佳的現象。再者，習知霧面微結構的出光能量較低，而 ❹本發明之導光板實施例可於柱狀結構的頂部再設置凹陷 結構，藉以提高兩侧的出光能量且可據此進行更多元的密 度分布’進-步提高整體背光模組的出光均勻度。 —’、、：本發月已以較佳實施例揭露如上，然其並非用以 本發明’任何熟習此技藝者，在不脫離本發明之精神 和範圍内，當可作些許之更動與潤飾，因此本發明之保護 範圍田視後附之申請專利範圍所界定者為準。另外，本發 ’任實施例或申請專利範圍不須達成本發明所揭露 ❹^全部目的或優點或特點。此外，摘要部分和標題僅是用 辅助專利文件搜尋之用’並非用來限制本發明之權利範 【圖式簡單說明】 第1圖為習知—背光模組之立體分解圖。 一 圖為顯示5又有依本發明一實施例之導光板的背 光模組立體分解圖。 17 201015128 第3圖為顯示沿第2圖 圖。 之A-A線的導光板剖面示意 第4圖為顯示依本發明一 放大示意圖。 貫施例之柱狀結構的局部 第5A及5B圖為顯示本發 分別沿第一及第二方向的 —實施例之導光板結構 ❹ ❹ J 面示意圖。 第6A圖為顯示依本發明— 部放大圖，第6B圖為沿第6 實施例之柱狀結構的局 第7A至7D圖為顯示光二圖：“線的剖面圖。 狀結構的示意圖。 " 依本發明一實施例之柱 第8A圖為顯示本發明另— 放大示意圖。 列之柱狀結構的局部 第8B圖為顯示本發明另— 放大示意圖。 之柱狀結構的局部 第8C圖為沿第8B圖 意圖。 目之“線切割的柱狀結構剖面示 第9圖為顯示依本發明— 意圖。 身光模組的俯視示 第10圖為顯示本發明 放大示意圖。 月另-實施例之柱狀結構的局部 主要元件符號說明 18 201015128Fig. 8A is a partially enlarged schematic view showing a columnar structure of another embodiment of the present invention. The columnar structure 6〇2 shown in Fig. 8A is similar to the columnar structure 260 shown in Fig. 3 in that the columnar structure 6〇2 does not include the first slope 263 and the second slope of the branch structure 260. 264. Fig. 8B is a partially enlarged schematic view showing a columnar structure of another embodiment of the present invention. The columnar structure 602" shown in Fig. 7 is similar to the columnar structure 6〇2 shown in Fig. 7A, except that the columnar structure 602' is formed with a concave structure u. Fig. 8C is an Lf along the 8B chart. Schematic diagram of a line-cut columnar structure. Referring to Figures 8B and 8C, the groove τ, (defined by the first curved surface 26/, the 'second curved surface 268 and the first bottom surface 269') is along the second direction. The contour of the cut profile includes a first curve 621, a second curve, and a straight line (four) connected to the first curve 621 and the second curve 622. Preferably, the curves (3) and (2) may be circular arc curves, and the first curve 621 and the second curve 622 protrude from the first surface 221 with respect to the straight line 624, and the 624 is parallel to the first surface 221 . The straight ends & and w are connected to the first curve 621 and the second curve 622, respectively. When the second direction 42 cuts a plurality of sections, the distance between the two lines & Ν @ of the line 624 may vary or remain fixed with the position of the first direction*. In a different position of the difference ... in the two-column two columns 'when the groove is in the first-party: the contour of the profile is straight...the depth varies; the position changes together, in other words, the first curve 4 is soon The curve 622 convex 14 201015128 ❹ ❹ ^ ^ ^ 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面 表面The direction 41 is incremented and then decreased in a decreasing manner to form a concave structure "the depth of the straight line 624 of each of the d-side contours is between about 】] and about $ 〇 5 meters. The difference η between the same degree of the first surface 221 and the height of the straight line 624 from the first surface 221 is between about 1 and about 50 microns. FIG. 9 is a plan view showing the backlight module according to an embodiment of the invention. Referring to FIG. 9 , in the present embodiment, the light source 24 includes a plurality of light emitting diodes 241 arranged in a substantially parallel first direction 42. Since the light emitting body 241 is a point light source, the light guide plate 22 is adjacent to the two. A partial area of the adjacent light-emitting body 241 is likely to generate a dark area S (i and the bright area S1 alternately The light guide plate 22 of each of the above embodiments includes a plurality of columnar structures 26〇, 26〇', 6〇2, or 6〇2” disposed on the first surface 221, and the mother is not placed on the first surface. The columnar structure of 221 includes a first arcuate surface 267 and a first arcuate surface 268' disposed substantially in a parallel light transmission direction (first direction 41). Thus, the light is more likely to be directed to the columnar structure after leaving the light guide plate 22. The side diffusion 'reduces the brightness unevenness of the alternating light/dark bands on the light incident side. Further, the columnar structure disposed on the first surface 22 1 may further include at least one recessed structure U, and may bring the first surface 221 closer to The region Sa of the light incident surface 223 is formed with a density of the recessed structure u, and the region of the first surface 221 away from the light incident surface of the 223 forms the density of the recessed structures u, so that the light rays 15 201015128 are more easily moved away from the light guide plate 22 . The two sides of the columnar structure are diffused, and even if the density of the recessed structures in the region close to the light incident surface is greater than the distribution density of the region far from the light incident surface, it is also possible to provide the recessed structure U according to the light guide plate U. From the first surface 22 1 The energy distribution of the light leaving the area is set, and the recess structure 不同 of different densities is arranged in each area to adjust the energy distribution of the backlight module 20, so that the brightness of the backlight module 2 is even more uniform. The curvature of a curved surface 267 and the second curved surface 268 can control the angle at which the light 10 exits the light guide plate 22 and then scatter toward both sides of the columnar structure, thereby more effectively reducing the alternating distribution of light/dark bands. The surface 267 and the second curved surface 268 are smooth surfaces, so that no problem of halation or overall luminance reduction is caused. Fig. 10 is a partial enlarged view showing a columnar structure according to another embodiment of the present invention. The columnar structure 603 shown in Fig. 1 is similar to the columnar structure 260 shown in Fig. 3, except that the columnar structure 603 has two recessed grooves Τ1, Τ2' and thus further includes a third curved surface 2681 and A second bottom surface 2691. The third curved surface 2681 and the second bottom surface 2691 are substantially parallel to the first direction. • 41 sighs. The second bottom surface 2691 is connected between the second curved surface 268 and the third curved surface 2681. In the same manufacturing method using precision machining, the recessed structure U is easier to manufacture than the conventional matte microstructure, and thus the process stability is high. In addition, the multi-raise of the number of recessed structures U per unit area can be adjusted according to individual optical requirements, for example, in the shadow area or the area where the amount of light needs to be enhanced, and the number of concave structures 16 201015128 can be increased, as compared with the Knowing that the light guide plate is provided with a matte microjunction on the upper surface thereof, and the tenth embodiment of the light guide plate of the invention not only has high process stability, but also has a good process, and has a grooved columnar structure to allow light to leave. After the light is guided, the valley is more likely to diffuse to both sides of the columnar structure, thereby reducing the unevenness of light uniformity at the light entrance side. Furthermore, the light-emitting energy of the conventional matte microstructure is low, and the light guide plate embodiment of the present invention can further provide a recessed structure on the top of the columnar structure, thereby improving the light-emitting energy on both sides and can further perform accordingly. The density distribution of the element 'in step-by-step improves the uniformity of light output of the overall backlight module. - ', , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Therefore, the scope of the invention is defined by the scope of the patent application. In addition, all of the objects or advantages or features of the present invention are not required to be achieved by the present invention. In addition, the abstract sections and headings are only used for the purpose of searching for auxiliary patent documents. The present invention is not intended to limit the scope of the invention. [Fig. 1 is a perspective exploded view of a conventional backlight module. 1 is an exploded perspective view showing a backlight module of a light guide plate according to an embodiment of the present invention. 17 201015128 Figure 3 shows the picture along Figure 2. A schematic view of a light guide plate of the A-A line Fig. 4 is an enlarged schematic view showing the present invention. Part 5A and 5B of the embodiment are schematic views showing the structure of the light guide plate of the embodiment in the first and second directions, respectively. Fig. 6A is a view showing an enlarged view of a portion according to the present invention, and Fig. 6B is a view showing a light diagram taken along line 7A to 7D of the columnar structure of the sixth embodiment: "A cross-sectional view of the line. A schematic view of the structure. 8A is a further enlarged view of the present invention. Part 8B of the columnar structure of the column is a further enlarged view of the present invention. Part 8C of the columnar structure is It is intended to be along line 8B. The purpose of the "line-cut columnar structure section is shown in Figure 9 for the purpose of the present invention. A plan view of the body light module Fig. 10 is an enlarged schematic view showing the present invention. Month - Part of the columnar structure of the embodiment Main symbol description 18 201015128
10 背光模組 11 背板 12 導光板 121 上表面 122 下表面 123 V型溝槽 124 側入光面 13 反射片 14 光源 15 逆棱鏡片 16 光學膜 20 背光模組 21 背板 211 側面 212 底面 22、 22’ 導光板 221 第一表面 222 第二表面 223 入光面 23 反射片 24 光源 241 發光二極體 19 201015128 250 V型溝槽 260、 260' 柱狀結構 263 第一斜面 - 264 第二斜面 267 « 第一弧面 268 第二弧面 2681 Ο 第三圓柱側面 269 第一底面 2691 第二底面 41 第一方向 42 第二方向 602, ' >602” 柱狀結構 621 第一曲線 622 第二曲線 623 第三曲線 〇 624 直線 10 光線 ' S 曲面 Τ、Τ’、ΤΙ、T2 凹槽 U 凹陷結構10 backlight module 11 back plate 12 light guide plate 121 upper surface 122 lower surface 123 V-shaped groove 124 side light-in surface 13 reflective sheet 14 light source 15 reverse prism sheet 16 optical film 20 backlight module 21 back plate 211 side 212 bottom surface 22 22' light guide plate 221 first surface 222 second surface 223 light incident surface 23 reflection sheet 24 light source 241 light emitting diode 19 201015128 250 V-shaped groove 260, 260' columnar structure 263 first slope - 264 second slope 267 « First curved surface 268 Second curved surface 2681 Ο Third cylindrical side 269 First bottom surface 2691 Second bottom surface 41 First direction 42 Second direction 602, '> 602' Columnar structure 621 First curve 622 Second Curve 623 Third curve 〇 624 Straight line 10 Ray 'S Surface Τ, Τ', ΤΙ, T2 Groove U Sag structure