201243400 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種光學膜片，且特別是有關於一種用於 均勻化面光源的光學膜片。 【先前技術】 液晶顯示器包括液晶顯示面板與背光模組，其中由於液晶 顯示面板本身不發光’所以需藉由背光模組提供液晶顯示面板 所需的顯示光源。 圖1疋習知一種背光模組的剖面示意圖。請參照圖1，習 知背光模組100包括光源110以及導光板120，其中光源 配置於導光板120的入光面122旁，以提供光線至導光板'12〇, 而導光板120用以將光線轉換成從出光面124出射的面光源。 此外，為了提升面光源的均勻性，導光板12〇的出光面124上 可設置多個光學膜片，這些光學膜片包括下擴散片13()、下棱 鏡片140、上稜鏡片150以及上擴散片16〇。下擴散片】邓先 將光線擴散’接著再依序藉由下棱鏡片14〇與上稜 光線進行集光，之後再藉由上擴散片16〇來調整= 到均勻化面光源的目的。 然而，背光模組100所使用的光學膜片之數量過多，不僅 導致背光模組1GG的厚度較厚且重量健，還需花費許多時間 組裝光學膜片’造成背光模挺1〇〇的生產效率較差。此外，組 裝光學膜片時易產生組裝公差，而過多的光學則會導致組裝 公差的累積，以致於降低面光源的品質。 ， 為了改善上述問題，習知技術提出一種複合式的光學膜 201243400 1 ψ 片’以減少光學膜片的使用量。如圖2所示，光學膜片200包 括基材210、擴散層22〇以及多個稜鏡柱23〇，其中擴散層22〇 配置於基材210的入光面212，而稜鏡柱23〇配置於基材21〇 的出光面214 °如此，光學膜片2〇〇具有擴散及集光的功能， ft能!^一片擴散片及一片梭鏡片。但因擴散層22G容易使 部分光能篁過於分散，導致稜鏡柱23〇可利用的光能量變少。 因此’使用光學膜片2〇〇的背光模組，其整體亮度表現較圖1 之背光模組100差。 【發明内容】 本發明提供-種光學膜片，以提高集光效率 、光利用效率 以及光均勻性。 ，達上述優點，本發明提出一種光學膜片，其包括基材、 多個第一集光結構以及多個擴散結構。基材具有相對的入光面 與出光面Ιί集光結構配置於人光面’每—第—集光結構具 有才>目對的底面與頂角，且底面連接入光面。擴散結構分別配置 於些第一集光結構之間的空隙内。擴散結構緊鄰第一集光結 構’每一第一集光結構的頂角與每一擴散結構之遠離基材的底 面位於同一平面。 在本發明之一實施例中，上述之第一集光結構為三角柱。 在本發明之-實施例中，上述之每一三角柱之頂角的角度 範圍介於80度至120度。 在本發明之-實施例中，上述之第一集光結構為半圓柱。 在本發明之-實施例中’上述之每—半圓柱之—圓弧面的 曲率半徑介於20微米（μηι)與3〇μπι之間。 在本發明之—實施例中，上述之光學膜片更包括多個第二 5 201243400 集光結構’配置於出光面，其中第—集光結構與第 ； 為稜鏡柱。每-第—集光結構具有第—練方向，每二二 光結構具有第二長軸方向，且第―長軸方向平行或垂直第二^ 轴方向。 一 在本發明之一實施例中，上述之相鄰的第一集光結 而相鄰的第二集先結構之與出先“的】 例中，上述之光學膜片更包括保護片， =發明之—實施例中’上述之相鄰的擴散結構的底面彼 此相鄰接。 為達上述優點，本發明另提出一種光學膜片，其包括基 材、多個第一集光結構以及多個擴散結構。基材具有相對的入 光面與出光面’第-集光結構配置於人絲，助鄰兩第一集 光結構之間存有空隙。擴散結構分別配置於空隙内其中每一 空隙之8 0 %以上的空間被對應的擴散結構所佔據。 為達上述優點，本發明又提出一種光學膜片，其包括基 材、多個擴散結構以及多個第一集光結構。基材具有相對的入 光面與出光面，擴散結構配置於入光面，且相鄰兩擴散結構之 間存有空隙。每一擴散結構具有遠離基材的底面，且相鄰的擴 散結構之底面彼此相鄰接。第一集光結構分別配置空隙内，且 第一集光結構緊鄰擴散結構。 在本發明之光學膜片中，由於擴散結構與基材的入光面之 間設有第一集光結構，所以光能量被擴散結構分散後，第一集 光結構可使光能量集中，以提升本發明之光學膜片的集光效 率。此外，因第一集光結構可使入射基材之入光面的入射角變 201243400 小’以降低發生全反射的機率，所以能提升光利用效率。另外， 因大部分的光線會先被擴散結構擴散後，才由第一集光結構進 行集光，故有助於提升光均勻性。 為讓本發明之上述和其他目的、特徵和優點能更明顯易 懂’下文特舉較佳實施例，並配合所附圖式，作詳細說明如下。 【實施方式】 圖3是本發明一實施例之一種光學膜片的立體示意圖。請 參照圖3，本實施例之光學臈片3〇〇包括基材31〇、多個第_ 集光結構320以及多個擴散結構33〇。基材31〇具有相對的入 光面312與出光面314，而入光面312與出光面314之間的距 離例如是介於30微米至300微米之間。 上述之擴散結構330配置於入光面312，且相鄰兩擴散結 構330之間存有空隙，而第一集光結構32〇分別配置這些空隙 内，且第一集光結構320緊鄰擴散結構33〇。以另一個角度而 言，每一第一集光結構320具有相對的底面322與頂角324, 且底面322連接入光面312。擴散結構33〇分別配置於這些第 集光結構320之間的空隙内，且擴散結構33〇緊鄰第一集光 結構320。此外，每一第一集光結構320的頂角324盥每二擴 騎構330之遠離基材310的底面332位於同一平面，亦即第 —集光結構320的頂角324切齊擴散結構33〇的底面332。另 外，相鄰的擴散結構330之底面332彼此相鄰接。 33i ，每—擴散結構包衫個擴散粒子 乂藉由擴政粒子331來達到擴散光線的功效。此外，光 予膜片300例如更包括多個第二集光結構34〇。這 結構340 @己置於基材31〇的出光面314。相鄰的第一集[結構 201243400 320之底面322例如彼此相鄰接，而基材310的入光面312 如是被這些第-集光結構32〇的底面322完全覆蓋。相第 二集光結構340之與出光面314連接的底面342例如彼此相鄰 接，且出光面314例如是被這些第二集光結構34〇 完全覆蓋。 広田 承上述，第一集光結構320與第二集光結構34〇例如為稜 鏡柱’且第一集光結構320具有第一長軸方向321第二集光結 f 340具有第二長軸方向34卜且第-長軸方向321例如是‘ 行於第二長軸方向34卜此外，在本實補中，第—集光結構 3^0與第二集光結構34〇都以為三角柱為例，但本發明並不限 定第一集光結構320與第二集光結構34〇的形狀需相同。另 外，為達到較佳的集光效率，上述每一第一集光結構320之頂 角324與第二集光結構34〇之頂角344的角度範圍例如是介於 8〇度至120度，但不以此為限。 圖4是本發明一實施例中光線於光學膜片中的光路徑示 意圖。請參照圖4 ,基材31〇之入光面312所面對的側邊為光 學膜片300的入光侧’當光線50從光學膜片300的入光側進 入光學膜片300時，光線50會先進入擴散結構33〇中。擴散 結構330中的擴散粒子331會先將光線5〇擴散，而被擴散後 的光線52會進入第一集光結構32〇中。第一集光結構32〇會 先對光線52進行初步的集光，接著光線52穿過基材310而進 入第二集光結構340。第二集光結構340亦可對光線52進行 集光’以使光線52從光學膜片300出射後的出射角度較為集 中。 、 相較於先前技術所使用的複合式的光學膜片200 (如圖2 所不），本實施例之光學膜片300因在基材310的入光面312 201243400 設置第一集光結構320，所以可藉由第一集光結構320來修正 被擴散結構330擴散後的光線52之路徑，以集中光能量，進 而提升光學膜片300的集光效率。另f方面，第一集光結構 320能使光線52入射入光面312時的入射角變小，能減少光 線52在入光面312發生全反射的機率，所以能提升光學膜片 300的光利用效率。此外，因絕大部分的光線52是先被擴散 結構330擴散後’才由第一集光結構320進行集光，故有助於 提升光均勻性。 請參照圖5，在本發明另一實施例中’可於擴散結構33〇 的底面332設置保護片35〇，以提供保護效果。此保護片35〇 可選用具有抗靜電功能的材質。如此，當光學膜片3〇〇a下方 没有其他光學膜片時，保護片350可防止光學膜片3〇〇a與其 下方的光學膜片之間產生靜電吸附的情形。 在上述光學膜片300中，雖然第一集光結構32〇的第一長 軸方向321平行第二集光結構34〇的第二長軸方向341，但在 其他實施例中，如圖6所示，第一集光結構32〇的第一長軸方 向321也可以垂直第二集光結構34〇的第二長軸方向341。此 外，雖然上述各實施例的第一集光結構32〇與第二集光結構 340都是以棱鏡柱為例’但在其他實關中，每 沿一直線排列的多個角錐取代。 ’兄才叮 在上述光學膜片3〇〇中，雖然第一集光結構32〇是以三角 柱為例，但本發明並不限定第一集光結構32〇的形狀在^ 7 所示的另-實施财，第—#紐構32()，為半_ 到 佳的集光效率，半圓柱之圓弧面326的曲率半徑例 2〇μηι與30μηι之間。需說明的是，本文中的半圓 具 有圓弧面的柱體，並非限定為圓柱的一半。此外，請參y圖8、, 201243400 在本發明另一實施例中，第二集光結構34〇，也可以是 ^構320’相_半圓柱。但本發明中，第—集光結構與第二 集，結構的形狀可不相同，以圖9為例，第—集光結構挪為 二角柱，而第二集光結構34〇,為半圓柱。 ·… 不光學膜片綱中，雖_散結構33G是藉由擴散粒 =332來糊錄絲，但本發明並祕定擴散結構的擴散機 制。以® 10為例，擴散結構33〇,包括互相堆疊的第一介 336與第二介質層338，第一介質層说的折射率大於第二介 質層338的折射率，且第一介質層336與第二介質層观的接 觸面=37呈不規則狀。此處所謂的呈不規則狀的接觸面為 具有尚低起伏的不規則表面，且因互相連接的第一介質層 與第二介質層338的折射率不同，所以光線可在接觸面337產 生不同角度的折射與散射，如此可達到擴散光線的效果。 圖11是本發明另一實施例之光學膜片的剖面示意圖。請 參照圖11，本實施例之光學膜片300b與上述之光學膜片3〇〇 相似，差別處在於本實施例之光學膜片3⑼b中，擴散結構 並非填滿相鄰兩第一集光結構320之間的空隙s。實際上，只 要每一空隙S之80%以上的空間被對應的擴散結構32〇所佔 據，即可達到良好的擴散效果。此外，因大部分的光線（例如 約80%的光線）會先被擴散結構33〇擴散後，才由第一集光 結構320進行集光，故有助於提升光均勻性。 綜上所述，本發明之光學膜片中，由於擴散結構與基材的 入光面之間設有第一集光結構，所以光能量被擴散結構分散 後，第一集光結構可使光能量集中，以提升本發明之光學膜片 的集光效率。此外，因第一集光結構可使入射基材之入光面的 入射角變小，以降低發生全反射的機率，所以能提升光利用效 201243400 » » 率。 雖然本發明已以較佳實施例揭露如上，然其並非用以限定 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當視後 附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1是習知一種背光模組的剖面示意圖。 圖2是習知一種光學膜片的剖面示意圖。 圖3是本發明一實施例之一種光學膜片的立體示意圖。 圖4是本發明一實施例中光線於光學膜片中的 徑示 意圖。 > 圖5是本發明另一實施例之一種光學膜片的剖面示音圖。 圖6是本發明另一實施例之一種光學膜片的立體示;圖。 圖7是本發明另一實施例之一種光學膜片的剖=; 圖8是本發明另-實施例之-種光學膜片的干;^ =是，明另一實，一種光學膜片的‘201243400 VI. Description of the Invention: [Technical Field] The present invention relates to an optical film, and more particularly to an optical film for homogenizing a surface light source. [Prior Art] The liquid crystal display includes a liquid crystal display panel and a backlight module, and since the liquid crystal display panel itself does not emit light, it is necessary to provide a display light source required for the liquid crystal display panel by the backlight module. FIG. 1 is a schematic cross-sectional view of a backlight module. Referring to FIG. 1 , the backlight module 100 includes a light source 110 and a light guide plate 120 . The light source is disposed beside the light incident surface 122 of the light guide plate 120 to provide light to the light guide plate '12 〇 , and the light guide plate 120 is used to The light is converted into a surface light source that exits from the light exit surface 124. In addition, in order to improve the uniformity of the surface light source, a plurality of optical films may be disposed on the light-emitting surface 124 of the light guide plate 12, and the optical film includes a lower diffusion sheet 13 (), a lower prism sheet 140, a top sheet 150, and upper surface. The diffusion sheet is 16 〇. The lower diffusion sheet] Deng Xian diffuses the light' and then collects the light by the lower prism sheet 14〇 and the upper edge light, and then adjusts the uniform light source by the upper diffusion sheet 16〇. However, the number of optical films used in the backlight module 100 is excessive, which not only causes the thickness of the backlight module 1GG to be thick and strong, but also takes a lot of time to assemble the optical film, resulting in a production efficiency of the backlight module. Poor. In addition, assembly tolerances are apt to occur when assembling optical diaphragms, and excessive optics can result in accumulation of assembly tolerances that degrade the quality of the surface source. In order to improve the above problems, the prior art proposes a composite optical film 201243400 1 ’ sheet' to reduce the amount of optical film used. As shown in FIG. 2, the optical film 200 includes a substrate 210, a diffusion layer 22, and a plurality of columns 23, wherein the diffusion layer 22 is disposed on the light incident surface 212 of the substrate 210, and the column 23〇 The light-emitting surface 214 ° disposed on the substrate 21 is such that the optical film 2 has the function of diffusion and light collection, and can be a diffusion sheet and a shuttle lens. However, since the diffusion layer 22G easily disperses part of the light energy, the light energy available for the mast 23 is reduced. Therefore, the backlight module using the optical film 2 has a lower overall brightness performance than the backlight module 100 of FIG. SUMMARY OF THE INVENTION The present invention provides an optical film to improve light collection efficiency, light utilization efficiency, and light uniformity. To achieve the above advantages, the present invention provides an optical film comprising a substrate, a plurality of first light collecting structures, and a plurality of diffusion structures. The substrate has opposite light incident surfaces and light exiting surfaces. The light collecting structure is disposed on the human light surface. Each of the first light collecting structures has a bottom surface and a top corner, and the bottom surface is connected to the light surface. The diffusion structures are respectively disposed in the spaces between the first light collecting structures. The diffusion structure is in close proximity to the first light collecting structure. The apex angle of each of the first light collecting structures is in the same plane as the bottom surface of each of the diffusing structures away from the substrate. In an embodiment of the invention, the first light collecting structure is a triangular prism. In an embodiment of the invention, the apex angle of each of the triangular prisms ranges from 80 degrees to 120 degrees. In an embodiment of the invention, the first light collecting structure is a semi-cylindrical shape. In the embodiment of the present invention, the radius of curvature of the arcuate surface of each of the above-mentioned semi-cylindrical surfaces is between 20 μm and 3 μm. In the embodiment of the present invention, the optical film further includes a plurality of second 5 201243400 light collecting structures disposed on the light emitting surface, wherein the first light collecting structure and the first light collecting structure are the masts. Each of the first-collecting light structures has a first-direction direction, and each of the two-two light structures has a second long-axis direction, and the first-long-axis direction is parallel or perpendicular to the second-axis direction. In an embodiment of the present invention, in the above-mentioned first first light-collecting junction and the adjacent second-collecting structure and the prior-article, the optical film further includes a protective sheet, and the invention In the embodiment, the bottom surfaces of the adjacent diffusion structures are adjacent to each other. To achieve the above advantages, the present invention further provides an optical film comprising a substrate, a plurality of first light collecting structures and a plurality of diffusions. The substrate has a relative light-incident surface and a light-emitting surface. The first-light collecting structure is disposed on the human filament, and there is a gap between the two first light collecting structures. The diffusion structures are respectively disposed in the gap. More than 80% of the space is occupied by the corresponding diffusion structure. To achieve the above advantages, the present invention further provides an optical film comprising a substrate, a plurality of diffusion structures, and a plurality of first light collecting structures. The light-incident surface and the light-emitting surface are disposed on the light-incident surface, and a gap exists between the adjacent two diffusion structures. Each diffusion structure has a bottom surface away from the substrate, and the bottom surfaces of the adjacent diffusion structures are adjacent to each other. First episode The optical structures are respectively disposed in the gaps, and the first light collecting structure is adjacent to the diffusing structure. In the optical film of the present invention, since the first light collecting structure is disposed between the diffusing structure and the light incident surface of the substrate, the light energy is After the diffusion structure is dispersed, the first light collecting structure can concentrate the light energy to improve the light collecting efficiency of the optical film of the present invention. In addition, the incident angle of the incident surface of the incident substrate can be changed by the first light collecting structure. 201243400 small 'to reduce the probability of total reflection, so it can improve the light utilization efficiency. In addition, since most of the light will be diffused by the diffusion structure before, it will be collected by the first light collecting structure, which will help to enhance the light. The above and other objects, features, and advantages of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; A perspective view of an optical film according to an embodiment of the invention. Referring to Figure 3, the optical cymbal 3 本 of the present embodiment includes a substrate 31 〇, a plurality of photo-collecting structures 320, and a plurality of diffusion structures 33 〇. base 31〇 has an opposite light incident surface 312 and a light exit surface 314, and the distance between the light incident surface 312 and the light exit surface 314 is, for example, between 30 micrometers and 300 micrometers. The diffusion structure 330 is disposed on the light incident surface 312. And a gap exists between the adjacent two diffusion structures 330, and the first light collecting structures 32〇 are respectively disposed in the gaps, and the first light collecting structure 320 is adjacent to the diffusion structure 33〇. In another angle, each The first light collecting structure 320 has opposite bottom surfaces 322 and apex angles 324, and the bottom surface 322 is connected to the light surface 312. The diffusing structures 33 〇 are respectively disposed in the gaps between the first collecting light structures 320, and the diffusion structures 33 are adjacent to each other. The first light collecting structure 320. In addition, the top corner 324 of each first light collecting structure 320 is located on the same plane, that is, the top of the first light collecting structure 320, away from the bottom surface 332 of the substrate 310. The corner 324 cuts the bottom surface 332 of the diffusion structure 33A. In addition, the bottom surfaces 332 of adjacent diffusion structures 330 are adjacent to each other. 33i, each diffusion structure coats a diffusing particle 乂 by expanding the particle 331 to achieve the effect of diffusing light. Further, the photo-improving film 300 further includes, for example, a plurality of second light-concentrating structures 34A. This structure 340 has been placed on the light exit surface 314 of the substrate 31. The adjacent first set [the bottom surface 322 of the structure 201243400 320 is adjacent to each other, for example, and the light incident surface 312 of the substrate 310 is completely covered by the bottom surface 322 of the first light collecting structure 32A. The bottom surface 342 of the second collector light structure 340 connected to the light exit surface 314 is adjacent to each other, for example, and the light exit surface 314 is completely covered by the second light collecting structures 34, for example. In the above, the first light collecting structure 320 and the second light collecting structure 34 are, for example, a mast and the first light collecting structure 320 has a first long axis direction 321 and the second light collecting node f 340 has a second long axis. The direction 34 and the first-axis direction 321 are, for example, 'in the second long-axis direction 34. In addition, in the present embodiment, the first-collecting structure 3^0 and the second light-harvesting structure 34〇 are both triangular columns. For example, the present invention does not limit the shape of the first light collecting structure 320 and the second light collecting structure 34A. In addition, in order to achieve better light collection efficiency, the angle between the apex angle 324 of each of the first light collecting structures 320 and the apex angle 344 of the second light collecting structure 34 is, for example, between 8 degrees and 120 degrees. But not limited to this. Figure 4 is a schematic illustration of the path of light in an optical film in accordance with one embodiment of the present invention. Referring to FIG. 4, the side of the substrate 31 facing the light incident surface 312 is the light incident side of the optical film 300. When the light 50 enters the optical film 300 from the light incident side of the optical film 300, the light is incident. 50 will first enter the diffusion structure 33〇. The diffusing particles 331 in the diffusing structure 330 first diffuse the light 5〇, and the diffused light 52 enters the first light collecting structure 32〇. The first collection of light structures 32 will initially collect the light 52, and then the light 52 will pass through the substrate 310 and into the second light collection structure 340. The second light collecting structure 340 can also collect the light ray 52 so that the light exiting angle from the optical film 300 is concentrated. Compared with the composite optical film 200 used in the prior art (as shown in FIG. 2), the optical film 300 of the present embodiment is provided with the first light collecting structure 320 due to the light incident surface 312 201243400 of the substrate 310. Therefore, the path of the light ray 52 diffused by the diffusion structure 330 can be corrected by the first light collecting structure 320 to concentrate the light energy, thereby improving the light collecting efficiency of the optical film 300. On the other hand, the first light collecting structure 320 can reduce the incident angle when the light 52 enters the light surface 312, and can reduce the probability of the light 52 being totally reflected on the light incident surface 312, so that the light of the optical film 300 can be improved. usage efficiency. In addition, since most of the light rays 52 are first diffused by the diffusion structure 330, the light is collected by the first light collecting structure 320, thereby contributing to the improvement of light uniformity. Referring to Fig. 5, in another embodiment of the present invention, a protective sheet 35'' may be disposed on the bottom surface 332 of the diffusion structure 33'' to provide a protective effect. This protective sheet 35〇 is available in an antistatic material. Thus, when there is no other optical film under the optical film 3a, the protective sheet 350 prevents electrostatic adsorption between the optical film 3A and the optical film below it. In the above optical film 300, although the first major axis direction 321 of the first light collecting structure 32A is parallel to the second long axis direction 341 of the second light collecting structure 34A, in other embodiments, as shown in FIG. It is to be noted that the first major axis direction 321 of the first light collecting structure 32A may also be perpendicular to the second long axis direction 341 of the second light collecting structure 34A. Further, although the first light collecting structure 32A and the second light collecting structure 340 of the above embodiments are both exemplified by prism columns, but in other realities, a plurality of pyramids arranged along a straight line are substituted. 'The brother is in the above optical film 3 ,, although the first light collecting structure 32 〇 is a triangular column as an example, the present invention does not limit the shape of the first light collecting structure 32 在 as shown in ^ 7 - Implementation of the fiscal, the first - #201732 (), for the half _ to the best collection efficiency, the radius of curvature of the semi-cylindrical arc surface 326 between 2 〇μηι and 30μηι. It should be noted that the semicircle in this paper has a cylinder with a circular arc surface, and is not limited to half of the cylinder. In addition, please refer to FIG. 8, and 201243400. In another embodiment of the present invention, the second light collecting structure 34A may also be a 320' phase_semi-cylindrical. However, in the present invention, the shape of the first light collecting structure and the second set may be different. In Fig. 9, for example, the first light collecting structure is a two-corner column, and the second light collecting structure 34 is a semi-cylindrical shape. In the non-optical film, although the scatter structure 33G is a paste-grained yarn by diffusion granules = 332, the present invention secretly defines a diffusion mechanism for the diffusion structure. For example, the diffusion structure 33A includes a first dielectric layer 336 and a second dielectric layer 338 stacked on each other. The first dielectric layer has a refractive index greater than that of the second dielectric layer 338, and the first dielectric layer 336 The contact surface with the second dielectric layer view = 37 is irregular. Here, the irregular contact surface is an irregular surface having a low undulation, and since the refractive indices of the interconnected first dielectric layer and the second dielectric layer 338 are different, the light may be different at the contact surface 337. The angle of refraction and scattering, so as to achieve the effect of diffusing light. Figure 11 is a cross-sectional view showing an optical film according to another embodiment of the present invention. Referring to FIG. 11, the optical film 300b of the present embodiment is similar to the optical film 3〇〇 described above, except that in the optical film 3(9)b of the embodiment, the diffusion structure does not fill the adjacent two first light collecting structures. The gap s between 320. In fact, as long as more than 80% of the space of each gap S is occupied by the corresponding diffusion structure 32, a good diffusion effect can be achieved. In addition, since most of the light (e.g., about 80% of the light) is first diffused by the diffusion structure 33, the light is collected by the first light collecting structure 320, thereby contributing to the improvement of light uniformity. In summary, in the optical film of the present invention, since the first light collecting structure is disposed between the diffusing structure and the light incident surface of the substrate, the first light collecting structure can make the light light dispersed by the diffusion structure. The energy is concentrated to enhance the light collecting efficiency of the optical film of the present invention. In addition, since the first light collecting structure can reduce the incident angle of the incident surface of the incident substrate to reduce the probability of total reflection, the light utilization efficiency can be improved 201243400 ». While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a conventional backlight module. 2 is a schematic cross-sectional view of a conventional optical film. 3 is a perspective view of an optical film according to an embodiment of the present invention. Figure 4 is a perspective view of the light in an optical film in accordance with one embodiment of the present invention. > Figure 5 is a cross-sectional view of an optical film according to another embodiment of the present invention. Figure 6 is a perspective view of an optical film according to another embodiment of the present invention; Figure 7 is a cross-sectional view of an optical film according to another embodiment of the present invention; Figure 8 is a view of another embodiment of the optical film of the present invention; ^ = Yes, another real, an optical film '
圖疋本發明另-實施例之-種光學⑽的剖面示意 圖11是本發明另一實施例之一種光學膜Η 一 > 1的剖面不思 【主要元件符號說明】 5()'52:光線 100:背光模組 201243400 110 :光源 120 :導光板 122、212、312 :入光面 124、214、314 :出光面 130 :下擴散片 140 :下棱鏡片 150 :上稜鏡片 160 :上擴散片 200、300、300a、300b :光學膜片 210、310 :基材 220 :擴散層 230 :稜鏡柱 320、320’ ：第一集光結構 321 :第一長轴方向 322、332、342 :底面 324、344 :頂角 330、330’ ：擴散結構 331 :擴散粒子 336 :第一介質層 338 :第二介質層 340、340’ ：第二集光結構 341 :第二長轴方向 350 :保護片 S :空隙 12BRIEF DESCRIPTION OF THE DRAWINGS FIG. 11 is a cross-sectional view 11 of an optical (10) according to another embodiment of the present invention. FIG. 1 is a cross section of an optical film & 1 of the present invention. [Main component symbol description] 5 () '52: Light 100: backlight module 201243400 110: light source 120: light guide plate 122, 212, 312: light-incident surface 124, 214, 314: light-emitting surface 130: lower diffusion sheet 140: lower prism sheet 150: upper wafer 160: upper diffusion sheet 200, 300, 300a, 300b: optical film 210, 310: substrate 220: diffusion layer 230: mast 320, 320': first light collecting structure 321: first long axis direction 322, 332, 342: bottom surface 324, 344: apex angles 330, 330': diffusion structure 331: diffusion particles 336: first dielectric layer 338: second dielectric layer 340, 340': second light collection structure 341: second long axis direction 350: protective sheet S: void 12