M338358 八、新型說明： 【新型所屬之技術領域】 本新型是有關於一種光學複合膜結構。 【先前技術】 ， 液晶顯示器（LCD)無法自行發光，需利用一所謂的背光 扠組可提供充足明亮之光源，使液晶顯示器能正常顯示影 像。為使背光模組之光源亮度均勻分布於顯示區域内，更 進步了更有效利用光源，在光源與液晶單元間設置光學 膜片，以將透過光亮度均勻分佈及將光源散射的光線正面 集中，將原本散亂的光線集中至一集中角度範圍内，以將 視角外未被利用的光，利用光的反射循環再利用以減少損 失增益亮度，進一步以達光源節能的效果。 所謂的光學膜片可以是由複數不同特性之光學膜片所 構成，至少包含一聚光膜片及一擴散膜片。所謂的擴散膜 片係設置於於光源一側，以達成光於顯示區域内之亮度分 籲 料勻化之效；臨液晶元件一側則設置一|光膜#，以將 經過擴散膜之片之擴散光折射後以一特定角度區域集中入 • 射於液晶單元達成提升輝度之效。然而，近年來為降低顯 示元件成本及為使顯示元件的厚度薄型化，係發展將複數 的光學膜片結構共同結合為單一光學膜結構，即所謂的光 學複合膜，以達降低製作成本及減小厚度的效果。 該專光學複合臈結構可參酌如台灣專利第M293442號 及台灣專利第M307764號結構，其中該等複合膜之擴散層 結構在設計上多採以添加粒子結構材料以達成光擴散效 5 M338358 果，然該等以粒子附加於複合膜之結構仍有缺憾存在，如， 一、粒子的折射率較大雖然提供較佳的擴散效果不過也同 時造成光散射角度較大聚光不易致使輝度衰減，一般而 言’在光學特性上若僅設置一聚光層可提升輝度增益達 50%，不過更進一步結合一擴散層輝度往往會降低，輝度增 益僅達20〜30% ;二、量產的光學複合膜片尺寸較大，需再 加以裁切以配合顯示元件的尺寸應用，各該複合膜片的裁 切邊’於裁切過程易致擴散膜片的粒子剝落，造成另一汙 染，造成生產製造上的良率限制因素；三、擴散層之添加 粒子多以玻璃材質為主，而聚光層材質則多以樹脂材質， 兩者在硬度上有明顯的差異，也因此在複合膜製作包裝成 絪或是應用時複合膜多層堆疊使得聚光層有機會與擴散粒 子直接接觸，粒子易破壞聚光層之表面微結構，造成損毁。 以上複合膜之諸多限制，仍有待改善者。 【新型内容】 因此本新型的目的就是在提供一種改良的光學複合膜 結構。 根據本新型之上述目的，提出一種光學複合膜結構， 其包含一基材層、一擴散層以及一聚光層。基材層具有兩 相對面。擴散層位於基材層的兩相對面其中之一，其中擴 散層的表面具有複數的凝團，該些凝團具有寬度範圍介於 10/z m〜20μ m之間，且其厚度為1〇#m以下。聚光層位 於遠基材層的另一相對面。 依照本新型一較佳實施例，一種光學複合膜結構包含 6 M338358 一基材層、一擴散層以及一聚光層。一擴散層位於基材層 上，其中擴散層的表面具有複數的凝團，該些凝團具有寬 度範圍介於lO/z m〜20 之間，且其厚度為ιοαπι以下。 聚光層位於擴散層上且擴散層位於聚光層與基材層之間。 依照本新型一較佳實施例，一種光學複合膜結構包含 一基材層、一擴散層以及一聚光層。基材層具有兩相對面。 兩擴散層位於基材層的兩相對面上，其中擴散層的表面具 有複數的凝團，該些凝團具有寬度範圍介於1〇//m〜2〇//m 之間，且其厚度為以下。聚光層位於兩擴散層其中 之一上。 【實施方式】 請參照第1圖，其繪示依照本新型一較佳實施例的一 種光學複合膜結構。光學複合膜結構1 包含擴散膜1 、 基材層104以及聚光層1〇6，因而具備聚光及擴散之雙重功 月b基材層1 〇4的材質可以是透明的pc或pet塑膠。聚 光層106由複數稜鏡1〇仏排列而成，每一稜鏡1〇以均具 有一三角形截面與一稜線106b，稜鏡106a的稜線106b均 相互平行。擴散膜102具有複數凝團108分佈於其表面， 其特徵與尺寸將於以下敘述。 睛參照第2圖，其繪示第丨圖的光學複合膜結構其中 =基材層與擴散層的剖面。凝目1〇8雖為不規則形狀，但 其尺指能符合以下限制，則較容易使光學複合膜結構整 體的輝度增益達到3〇%以上。在—實施例中，凝團具有寬 度I介於10#m〜2〇/zm之間且其厚度L為⑺心以 M338358 下。在另-實施例中’擴散膜1G2具有基本厚度1為w m;凝團具有寬度Wl介於心m〜2心m之間，且其厚度 T2為10" m以下。在又一實施例中，凝團i⑽具有寬度 Wi介於ΙΟ/zm〜lOvm之間；凝團厚度丁2為i〇#m以下， 且其厚度（I) 5/zm以上者達90%以上。當擴散層1〇2與 凝團108具有上述的特徵，且擴散層1〇2與聚光層1〇6之 折射率差異介於0.05〜0.25時，光學複合膜結構1〇〇的整 體輝度增益很容易達到30%以上。 請參照第3〜5圖，其繪示依照本新型的三種光學複合 膜結構的較佳實施例。在第3圖中，擴散層1〇2與聚光層 106分別形成於基材層1〇4的相對兩面上。擴散層與聚 光層106的材質可以是可光硬化的透明樹脂。當可光硬化 的透明樹脂塗佈於基材層104後，藉滾壓形成如第1圖的 凝團108,接著以光硬化製程使凝團108硬化或固化。聚光 層106亦可以是可光硬化的透明樹脂塗佈於基材層1〇4的 另一面’接著形成梭鏡而硬化或固化。 在第4圖中，擴散層1〇2與聚光層106形成於基材層 104的同一側上，且擴散層1〇2介於聚光層1〇6與基材層 104之間。擴散層1〇2與聚光層106的材質可以是可光硬化 的透明樹脂。當可光硬化的透明樹脂塗佈於基材層104後， 藉滾壓形成如第1圖的凝團108,接著以光硬化製程使凝團 108硬化或固化。聚光層106接著塗佈於擴散層102上，並 形成棱鏡而硬化或固化。 在第5圖中，擴散層102形成於基材層104的相對兩 面上。擴散層102與聚光層106的材質可以是可光硬化的 8 M338358 透明樹脂。當可光硬化的透明樹脂塗佈於基材層104的兩 面後，藉滾壓形成如第1圖的凝團108，接著以光硬化製程 使凝團108硬化或固化。聚光層106接著塗佈於兩擴散層 102的其中之一，並形成稜鏡而硬化或固化。 由上述本新型較佳實施例可知，本光學複合膜結構之 擴散層為一種單一材質，無需另外添加粒子，不致產生粒子剝 落，所以不致於破壞聚光層之微結構。此外，本新型利用控 制擴散層表面凝團的尺寸，進而控制擴散層與聚光層之折射 率差異，使得光學複合膜結構整體的輝度增益能夠提升。 雖然本新型已以一較佳實施例揭露如上，然其並非用 以限定本新型，任何熟習此技藝者，在不脫離本新型之精 神和範圍内，當可作各種之更動與潤飾，因此本新型之保 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】 為讓本新型之上述和其他目的、特徵、優點與實施例 月b更明顯易懂’所附圖式之詳細說明如下·· 第1圖係繪示依照本新型一較佳實施例的一種光學複 合膜結構； 第2圖係繪示依照本新型一較佳實施例的一種光學複 合膜結構其中之基材層與擴散層的剖面；以及 第3〜5圖係繪不依照本新型的三種光學複合膜結構的 較佳實施例。 【主要元件符號說明】 9 M338358 100 :光學複合膜結構 102 :擴散層 104 :基材層 106 ··聚光層 106a :稜鏡 106b :稜線 108 :凝團 Wi :寬度 :厚度 τ2:厚度M338358 VIII. New description: [New technical field] The present invention relates to an optical composite film structure. [Prior Art], a liquid crystal display (LCD) cannot emit light by itself, and a so-called backlight fork group is required to provide a sufficiently bright light source for the liquid crystal display to display an image normally. In order to evenly distribute the brightness of the light source of the backlight module in the display area, the light source is more effectively utilized, and an optical film is disposed between the light source and the liquid crystal unit to uniformly distribute the transmitted light and distribute the light scattered by the light source. The originally scattered light is concentrated into a concentrated angle range, so that the light that is not utilized outside the viewing angle is recycled by the reflection of the light to reduce the loss gain brightness, and further achieves the effect of energy saving by the light source. The so-called optical film may be composed of a plurality of optical films of different characteristics, and includes at least a light collecting film and a diffusion film. The so-called diffusion film is disposed on the side of the light source to achieve the effect of homogenizing the brightness in the display area; and the side of the liquid crystal element is provided with a light film to pass the film through the diffusion film. The diffused light is refracted and concentrated at a specific angle to the liquid crystal cell to achieve enhanced brightness. However, in recent years, in order to reduce the cost of display elements and to make the thickness of display elements thinner, it has been developed to combine a plurality of optical film structures into a single optical film structure, a so-called optical composite film, in order to reduce the manufacturing cost and reduce Small thickness effect. The special optical composite 臈 structure can be considered as the structure of Taiwan Patent No. M293442 and Taiwan Patent No. M307764, wherein the diffusion layer structure of the composite film is designed to add a particulate structural material to achieve a light diffusion effect 5 M338358, However, there are still some defects in the structure in which particles are attached to the composite film. For example, the larger refractive index of the particles provides better diffusion effect, but at the same time, the light scattering angle is larger, and the concentration is less likely to cause the luminance to decay. In terms of optical characteristics, if only one concentrating layer is provided, the luminance gain can be increased by 50%, but the luminance of the diffusion layer is often reduced, and the luminance gain is only 20 to 30%. Second, the optical composite of mass production The diaphragm has a large size and needs to be cut to match the size of the display element. The cutting edge of each composite film is easy to cause the particles of the diffusion film to peel off during the cutting process, causing another pollution, resulting in manufacturing. The yield limiting factor on the third; third, the added particles of the diffusion layer are mostly made of glass material, while the material of the concentrating layer is mostly made of resin material, both of which have a hardness Difference, thus in the composite packaging film forming a composite film such that the multilayer stack into a generative force condensing layer or in direct contact with the opportunity to apply diffusion particles, the particles easy to damage the surface microstructure of the collecting layer, resulting in damage. Many limitations of the above composite membranes still need to be improved. [New content] Therefore, the object of the present invention is to provide an improved optical composite film structure. According to the above object of the present invention, an optical composite film structure comprising a substrate layer, a diffusion layer and a light collecting layer is proposed. The substrate layer has two opposing faces. The diffusion layer is located at one of two opposite faces of the substrate layer, wherein the surface of the diffusion layer has a plurality of agglomerates having a width ranging from 10/zm to 20 μm and a thickness of 1〇# m or less. The concentrating layer is located on the other opposite side of the distal substrate layer. In accordance with a preferred embodiment of the present invention, an optical composite film structure comprises a 6 M338358 substrate layer, a diffusion layer, and a concentrating layer. A diffusion layer is disposed on the substrate layer, wherein the surface of the diffusion layer has a plurality of agglomerates having a width ranging from 10/z m to 20 and a thickness of ιοαπι or less. The concentrating layer is on the diffusion layer and the diffusion layer is located between the concentrating layer and the substrate layer. In accordance with a preferred embodiment of the present invention, an optical composite film structure includes a substrate layer, a diffusion layer, and a light collecting layer. The substrate layer has two opposing faces. The two diffusion layers are located on opposite sides of the substrate layer, wherein the surface of the diffusion layer has a plurality of coacervates having a width ranging from 1 〇//m 2 to 2 〇//m, and the thickness thereof For the following. The concentrating layer is located on one of the two diffusion layers. Embodiments Please refer to FIG. 1 , which illustrates an optical composite film structure in accordance with a preferred embodiment of the present invention. The optical composite film structure 1 includes the diffusion film 1, the base material layer 104, and the light-concentrating layer 1〇6, and thus has a dual function of collecting and diffusing. The material of the base material layer 1 〇4 may be a transparent pc or pet plastic. The concentrating layer 106 is formed by a plurality of 稜鏡1 ,, each of which has a triangular cross section and a ridge line 106b, and the ridge lines 106b of the 稜鏡106a are parallel to each other. The diffusion film 102 has a plurality of clusters 108 distributed on its surface, the characteristics and dimensions of which will be described below. Referring to Fig. 2, there is shown a cross section of the optical composite film structure of the second embodiment, wherein the substrate layer and the diffusion layer. Although the eyepiece 1〇8 is irregular in shape, the ruler can meet the following restrictions, and it is easier to make the luminance gain of the optical composite film structure as a whole more than 3〇%. In the embodiment, the coagulum has a width I of between 10#m and 2〇/zm and a thickness L of (7) and a core of M338358. In another embodiment, the diffusion film 1G2 has a basic thickness 1 of w m; the coagulum has a width W1 between the centers m and 2 m, and the thickness T2 is 10 " m or less. In still another embodiment, the condensation group i(10) has a width Wi of between ΙΟ/zm and lOvm; a condensed thickness of 2 is less than i〇#m, and a thickness (I) of 5/zm or more is more than 90%. . When the diffusion layer 1〇2 and the condensation group 108 have the above characteristics, and the refractive index difference between the diffusion layer 1〇2 and the light collection layer 1〇6 is 0.05 to 0.25, the overall luminance gain of the optical composite film structure 1〇〇 It is easy to reach more than 30%. Referring to Figures 3 to 5, there are shown preferred embodiments of the three optical composite film structures in accordance with the present invention. In Fig. 3, a diffusion layer 1〇2 and a light-concentrating layer 106 are formed on opposite sides of the substrate layer 1〇4, respectively. The material of the diffusion layer and the concentrating layer 106 may be a photocurable transparent resin. After the photohardenable transparent resin is applied to the substrate layer 104, the pellets 108 as shown in Fig. 1 are formed by rolling, and then the pellets 108 are cured or cured by a photohardening process. The concentrating layer 106 may also be a photocurable transparent resin applied to the other side of the substrate layer 1 ’ 4 and then formed into a shuttle mirror to be hardened or cured. In Fig. 4, the diffusion layer 1〇2 and the light-concentrating layer 106 are formed on the same side of the substrate layer 104, and the diffusion layer 1〇2 is interposed between the light-concentrating layer 1〇6 and the substrate layer 104. The material of the diffusion layer 1〇2 and the light concentrating layer 106 may be a photocurable transparent resin. After the photohardenable transparent resin is applied to the substrate layer 104, the pellets 108 as shown in Fig. 1 are formed by rolling, and then the pellets 108 are cured or cured by a photohardening process. The concentrating layer 106 is then coated on the diffusion layer 102 and formed into a prism to be hardened or cured. In Fig. 5, the diffusion layer 102 is formed on the opposite sides of the substrate layer 104. The material of the diffusion layer 102 and the light concentrating layer 106 may be a photohardenable 8 M338358 transparent resin. After the photohardenable transparent resin is applied to both sides of the substrate layer 104, the pellets 108 as shown in Fig. 1 are formed by rolling, and then the pellets 108 are cured or cured by a photohardening process. The concentrating layer 106 is then applied to one of the two diffusion layers 102 and formed into a crucible to harden or cure. It can be seen from the above preferred embodiment of the present invention that the diffusion layer of the optical composite film structure is a single material, and no additional particles are added, so that the particles are not peeled off, so that the microstructure of the light-concentrating layer is not damaged. In addition, the novel utilizes the size of the surface condensation group of the diffusion layer to control the difference in refractive index between the diffusion layer and the concentrating layer, so that the luminance gain of the optical composite film structure as a whole can be improved. Although the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the present invention, and it is to be understood that those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. The scope of the new protection is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and easy to understand, the detailed description of the drawings is as follows: Figure 1 shows a comparison according to the present invention. An optical composite film structure of a preferred embodiment; FIG. 2 is a cross-sectional view of a substrate layer and a diffusion layer of an optical composite film structure according to a preferred embodiment of the present invention; and FIG. 3 to FIG. A preferred embodiment of the three optical composite film structures in accordance with the present invention. [Main component symbol description] 9 M338358 100 : Optical composite film structure 102 : Diffusion layer 104 : Substrate layer 106 · · Concentrating layer 106a : 稜鏡 106b : ridge line 108 : Condensation Wi : Width : Thickness τ 2 : Thickness