201024804 六、發明說明： / 【發明所屬之技術領域】 * 本發明係關於一種集光式光學複合膜及包含彼 等之背光模組，特別是關於一種可同時提高正面輝 度與光均勻性之集光式光學複合膜及具此光學複合 膜之背光模組。 • 【先前技術】 背光模組又稱背光板，泛指可以提供產品一個 背面光源之光學組件，普遍應用於數位相機、PDA、 衛星導航系統、筆記型電腦及液晶顯示器等。由於 液晶顯示器不是自發光性之顯示裝置，必須藉由外 部光源達到顯示效果，而背光模組即為此外部發光 源中的重要光學組件。 ❿ 一般而言，背光模組主要包含發光源、導光板 (或擴散板）、反射板、擴散膜、增亮膜及外框等結 構，其中增亮膜為液晶顯示器中重要的節能元件， 因為其具有將自導光板或擴散板散射出之光源正面 集中之功效，因而能增加光線自導光板或擴散板散 射出後之使用效益，使背光模組之輝度提高，進而 增加液晶顯示器之亮度。 請參閱第一圖，其為習知之增亮膜100的結構 示意圖，該增亮膜100由形成於基板10表面上之稜 201024804 鏡結構20所構成。一船__ 鏡結構2〇係由塗覆上二習。增亮膜100之稜 出甘上的成膜材料所形 f ’厂係透過機械加工的方式而形成模具、並以此 '具進打壓模形成各種㈣㈣鏡結構而製成。 由於機械加工的限制’習知增亮膜均呈規則分 佈的稜鏡結構，其聚光效果與特性亦因此而受限， =如此’在組成背光模組時需要多張不同功能 予膜搭配一齊使用才能達到需要的效果。由於 現有可攜式行動裝置之外觀都朝著輕薄短小做咬 因綠於可攜式行動裝置上所使用之顯示螢 幕’其厚度要求也變的越來越薄，故，如何在 失顯示螢幕亮度的情況下，減少背光模組之厚戶、 勻性’並進一步提升背光“ 的集先效果’以符合顯示螢幕在 值得深思的。 m疋 【發明内容】 有鑑於此’本發明提供了一種具有特殊結構之 集光式光學複合膜’藉由其特殊的結構^計以達到 凝聚光線、提高正面輝度及光均勻性之效果。 本發月另提供了—種具有高亮度之背光模組， 由於其具有高輝度之集光式光學複合膜，因此可大 幅提升其發光亮度及輝度的均句度，並可減少或取 4 201024804 消背光模組中其他光學膜（如擴散膜等）的使用。 基於上述構想，本發明之集光式光學複合膜係 包含：一基板；一集光層，其係位於該基板之一第 一基板表面上；及一稜鏡結構，其係位於該基板之 一第二基板表面上，且該第二基板表面係與該第一 表面基板相對，其中該集光層係由含複數個凹透鏡 結構之一凹透鏡陣列建構而成。 • 於一較佳實施態樣中，該基板係選自一增亮 膜、一擴散板、一導光板或一偏光板。 於一較佳實施態樣中，該基板係一聚酯基板， 較佳係聚乙烯對苯二甲酸酯（PET)、聚甲基丙烯酸曱 酯（PMMA)、聚碳酸酯（PC)或三醋酸纖維素（triacetyl cellulose ; TAC)。 於一較佳實施態樣中，該集光層之材質係丙烯 參 酸樹脂或環氧樹脂。 於一較佳實施態樣中，該集光層之膜厚為3〜100 微米。 於一較佳實施態樣中，該凹透鏡陣列之各凹透 鏡結構之曲率半徑為5〜200微米，較佳為5〜100微 米。 於一較佳實施態樣中，該凹透鏡陣列之各凹透 鏡結構之最下緣處與該基板之該第一表面之間的距 5 201024804 離係小於5 0微米。 於一較佳實施態樣中，該凹透鏡陣列之各凹 鏡結構係呈規則排列。 於一較佳實施態樣中，該凹透鏡陣列之各凹透 鏡微結構對與該第-基板表面平行之平面之投影形 狀係呈圓形、橢圓形或菱形。 一於一較佳實施態樣中，該稜鏡結構係由複數個 一角柱半圓柱、梯形柱、半球形結構、半橢圓球 形結構、角錐狀結構或其組合所形成。 於其它實施態樣中，本發明之背光模組包含一 反射板，设置於該反射板上之一導光板；設置於導 光板上之上述光學複合膜；以及設置於該導光板入 光面之一侧之一光源，其中該光學複合膜中之集光 層係與導光板接觸。於一較佳實施態樣中，該背光 模組更包括一增亮膜，其設置於該光學複合膜上。 於一較佳實施態樣中，該背光模組更包括一擴 散膜’其設置於該導光板及該光學複合膜之間。 於另一較佳實施態樣中，本發明之背光模組包 含一擴散板；設置於該擴散板上之上述光學複合 膜；設置於該擴散板入光面之一侧之一光源；及設 置於該擴散板之底側之一反射板，而該反射板係用 以將該光源反射進入該擴散板，其中該光學複合膜 201024804 . 中之集光層係與擴散板接觸。 .' 於一較佳實施態樣中，該背光模組更包括一增 亮膜，其設置於該光學複合膜上。 本案得藉由下列圖式及詳細說明，俾得以令讀 者更深入了解。 【實施方式】 請參閱第二A圖，其示意性說明了本發明之集 光式光學複合膜。如第二圖所示，本發明之集光式 光學複合膜200包含基板10、集光層30及棱鏡結 構20，其中該集光層30及棱鏡結構20係分別設置 於該基板10之兩相對表面上，且該集光層30係由 一凹透鏡陣列建構而成，其中該凹透鏡陣列係由複 數個凹透鏡結構35組成。 ❹ 根據本發明，該基板之材質係可為習知之增亮 膜之材質（諸如：PET)、偏光板之材質（諸如：TAC)， 或導光板及擴散板之材質（諸如：PMMA或PC)，但 並不限於此。 另，本發明中所指之擴散板，除了具有擴散光 源之功用外，亦具有支撐其它光學膜片（諸如：增亮 膜）之功用；而本發明中所指之擴散膜，則僅具有擴 散光源之功用。 201024804 :參閱第一 B圖，其係為本發明之集光 二 =部示意圖。由圖中可知，本發明中之集 數：：有凹透鏡陣列，而該凹透鏡陣列係由複 固凹透鏡結構35所建構而成的。 2式光學複合膜係利用該等凹透鏡結構35將： f光線進行集光’以增加具此光學複合膜之背光模 ❿ ❿ 二=了輝度。為達到最佳之集光效果該等凹透 鏡〜構35係依據凹透鏡公式％ + % = ^ (其 ί:::為像距、f為焦距)而加以設計’以尋找 虽之曲率半徑，進而獲得最佳集光效果之表 =。根據本發明之一較佳實施例，該集光層％ /一又t為3〜1〇〇微米，各凹透鏡結構％之曲率半 ^為5〜1〇0微米，較佳係在曲率半徑為50微米時， 各凹透鏡、纟。構35之最下緣處與該基板之該第一 面之間的距離h則是少於5〇微米。另，根據本發 # =光層3〇之材質包含、但不限於丙烯酸樹脂 或％氧樹脂。 椹’本發明中所指之凹透鏡結構係代表該結 I有中間薄邊緣厚之特性；而由仰視觀看本發明 凹透鏡、U# ’其外形係可呈圓形、橢圓形或菱形， 並不限於此’再者，本發明之凹透鏡結構係可均 二規則排列於集光層上亦可隨機分佈於集光層 的:= = = =知識者能推及與理解 乃rΜ圖不及為文贅述之。 201024804 於本發明之上述實施例中，棱鏡結構係由複數 個三角柱、半圓柱、梯形柱、半球形結構、半橢圓 球形結構、角錐狀結構（諸如：三角錐及四角錐狀） 或其組合所形成，但熟知該領域技術人士應瞭解， 棱鏡結構並不限於此，其他習知的規則結構亦可行 於本發明中。 本發明利用複數個凹透鏡結構將光源聚集，以 減少光源之損失’因此相較於傳統之增亮膜，本發 明之集光式光學複合膜係具有較佳之發光輝度，亦 因如此’將其應用至背光模組中，可實現在螢幕亮 度不損失之情況下，達到減少背光模組厚度之訴 求。而第三A圖及第三B圖即分別顯示說明了具有 本發明之集光式光學複合膜的侧光源式背光模組 3〇〇與下光源式背光模組300,。於第三A圖中，該 背光模組300係由反射板310、導光板320、本發明 之集光式光學複合膜330及光源350建構而成。第 三B圖所示之背光模組300,則係由反射板310、擴 散板325、本發明之集光式光學複合膜330及光源 350建構而成，而於反射板310與擴散板325之間 夾有一空氣層340。比較第三A圖及第三B圖所示 之結構，可發現背光模組300之光源位置係與背光 模組300’之光源位置不同。於背光模組300中，光 源350係設置於導光板320左側入光面處，而背光 模組300’之光源350，則設置於擴散板325下側入 201024804 - 光面處’其中需注意到，由於本發明是利用凹透鏡 . 陣列中各凹透鏡結構對來自光源所提供之光或是來 自經反射板反射之光進行集光，所以於該背光模組 3〇〇中，該集光式光學複合膜33〇之集光層係與導 光板320接觸；而於背光模組3〇〇’中，該集光式光 學複合膜330之集光層係與擴散板325接觸。然， 所屬技術領域具有通常知識者應知，若在只考慮螢 ❹ 幕壳度，不考慮背光模組厚度之情形下，本發明之 背光模組係可進一步與習知之增亮膜、擴散板共同 搭配使用。 综上所述，本發明之集光式光學複合膜因具有 一特，之聚光結構（凹透鏡結構），因此相較於傳統 之增冗膜係具有高輝度及均勻性之優勢，藉由該等 優勢本發明之集光式光學複合膜係可取代傳統背 | %模組中之増亮膜與擴散膜之組合，使f光模組之 厚度降低，因而能實現輕薄短小之訴求。 社人所有揭露於本發明書之特徵係可使用任何方式 ' 本說明書所揭露之特徵可使用相同、相等或 、的的特徵取代。因此，除了特別陳述強調處 卜本說明書所揭露之特徵係為一系列相等或相 似特徵中的-個實施例。 等戈相 外依據本說明書揭露之内容，熟悉本技術 係可輕易依據本發明之基本特徵，在不脫離 201024804 本發明之精神與範圍内，針對不同使用方法與情況 作適當改變與修飾，因此，其它實施態樣亦包含於 . 申請專利範圍中。 【圖式簡單說明】 第一圖為習知增亮膜之結構。 第二A圖為本發明之集光式光學複合膜之示意 赢 圖。 第二B圖為本發明之集光式光學複合膜之局部 示意圖。 第三A圖為具有本發明集光式光學複合膜之側 光源式背光模組的示意圖。 第三B圖為具有本發明集光式光學複合膜之下 光源式背光模組的示意圖。 φ 【主要元件符號說明】 10 基板 20 棱鏡結構 30 集光層 35 凹透鏡結構 100 習知增亮膜 200 集光式光學複合膜 300 背光模組 300， 背光模組 310 反射板 320 導光板 11 201024804 325 擴散板 330 集光式光學複合膜 340 空氣層 350 光源201024804 VI. DESCRIPTION OF THE INVENTION: / TECHNICAL FIELD OF THE INVENTION The present invention relates to a concentrating optical composite film and a backlight module including the same, and more particularly to a set capable of simultaneously improving front luminance and light uniformity. Optical optical composite film and backlight module with the same. • [Prior Art] Backlighting module, also known as backlighting board, refers to an optical component that can provide a back light source. It is commonly used in digital cameras, PDAs, satellite navigation systems, notebook computers, and liquid crystal displays. Since the liquid crystal display is not a self-illuminating display device, the display effect must be achieved by an external light source, which is an important optical component in the external light source. ❿ Generally speaking, the backlight module mainly comprises a light source, a light guide plate (or a diffusion plate), a reflection plate, a diffusion film, a brightness enhancement film and an outer frame, wherein the brightness enhancement film is an important energy-saving component in the liquid crystal display, because The utility model has the functions of concentrating the front side of the light source scattered from the light guide plate or the diffusion plate, thereby increasing the use efficiency of the light scattered from the light guide plate or the diffusion plate, thereby improving the brightness of the backlight module, thereby increasing the brightness of the liquid crystal display. Referring to the first drawing, which is a schematic view of the structure of a conventional brightness enhancing film 100, the brightness enhancing film 100 is composed of a prism structure 2024 formed on the surface of the substrate 10. A boat __ mirror structure 2 is coated by the second. The edge of the brightness enhancing film 100 is formed by forming a mold by mechanical processing, and forming a variety of (four) (four) mirror structures by means of a stamping die. Due to the limitation of machining, the conventional brightening film has a regularly distributed 稜鏡 structure, and its concentrating effect and characteristics are also limited. Therefore, it is necessary to use multiple different functions to form a backlight module. Achieve the desired effect. Since the appearance of the existing portable mobile device is made to be light and thin, the thickness of the display screen used on the portable mobile device is becoming thinner and thinner, so how to lose the brightness of the display screen In the case of the invention, the reduction of the thickness of the backlight module and the uniformity of the backlight module and further enhancing the backlighting effect of the backlight to conform to the display screen are worth pondering. m疋[Summary] In view of this, the present invention provides a The special structure of the light-collecting optical composite film 'by its special structure is used to achieve the effect of condensing light, improving frontal brightness and light uniformity. This month, another kind of backlight module with high brightness is provided. The high-intensity light collecting optical composite film can greatly improve the brightness and brightness of the brightness, and can reduce or take the use of other optical films (such as diffusion film) in the 201024804 backlight module. Based on the above concept, the concentrating optical composite film of the present invention comprises: a substrate; a concentrating layer on a surface of the first substrate of the substrate; and a 稜鏡The second substrate surface is opposite to the first surface substrate, wherein the light collecting layer is formed by a concave lens array including a plurality of concave lens structures. In a preferred embodiment, the substrate is selected from a brightness enhancing film, a diffusing plate, a light guide plate or a polarizing plate. In a preferred embodiment, the substrate is a polyester substrate. Preferably, polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polycarbonate (PC) or triacetyl cellulose (TAC). In a preferred embodiment The material of the light collecting layer is acrylic acid resin or epoxy resin. In a preferred embodiment, the film thickness of the light collecting layer is 3 to 100 micrometers. In a preferred embodiment, the concave lens Each of the concave lens structures of the array has a radius of curvature of 5 to 200 μm, preferably 5 to 100 μm. In a preferred embodiment, the lowermost edge of each concave lens structure of the concave lens array and the first of the substrate The distance between the surfaces is 5 201024804 and the system is less than 50 microns. In a preferred embodiment, the concave mirror structures of the concave lens array are regularly arranged. In a preferred embodiment, the concave lens microstructures of the concave lens array have a plane parallel to the surface of the first substrate. The projection shape is circular, elliptical or rhombic. In a preferred embodiment, the 稜鏡 structure is composed of a plurality of corner cylinders, a trapezoidal column, a hemispherical structure, a semi-elliptical spherical structure, and a pyramidal structure. Or a combination of the same, the backlight module of the present invention comprises a reflector, a light guide plate disposed on the reflector; the optical composite film disposed on the light guide plate; a light source on one side of the light-incident surface of the light guide plate, wherein the light-collecting layer of the optical composite film is in contact with the light guide plate. In a preferred embodiment, the backlight module further includes a brightness enhancement film, which is disposed On the optical composite film. In a preferred embodiment, the backlight module further includes a diffusion film disposed between the light guide plate and the optical composite film. In another preferred embodiment, the backlight module of the present invention comprises a diffusing plate; the optical composite film disposed on the diffusing plate; and a light source disposed on one side of the light incident surface of the diffusing plate; And reflecting the light source into the diffusing plate, wherein the light collecting layer in the optical composite film 201024804 is in contact with the diffusing plate. In a preferred embodiment, the backlight module further includes a brightness enhancement film disposed on the optical composite film. The case can be further explained by the following diagrams and detailed explanations. [Embodiment] Please refer to Fig. 2A, which schematically illustrates the concentrating optical composite film of the present invention. As shown in the second figure, the concentrating optical composite film 200 of the present invention comprises a substrate 10, a light collecting layer 30 and a prism structure 20, wherein the light collecting layer 30 and the prism structure 20 are respectively disposed on the opposite sides of the substrate 10. The surface of the light collecting layer 30 is constructed by a concave lens array composed of a plurality of concave lens structures 35. According to the present invention, the material of the substrate can be a material of a conventional brightness enhancement film (such as PET), a material of a polarizing plate (such as TAC), or a material of a light guide plate and a diffusion plate (such as PMMA or PC). , but not limited to this. In addition, the diffusing plate referred to in the present invention has the function of supporting other optical films (such as a brightness enhancing film) in addition to the function of the diffusing light source; and the diffusing film referred to in the present invention has only diffusion. The function of the light source. 201024804: Refer to the first B diagram, which is a schematic diagram of the light collection unit 2 of the present invention. As can be seen from the figure, the episodes of the present invention: have a concave lens array which is constructed by a solid concave lens structure 35. The 2-type optical composite film utilizes the concave lens structures 35 to: f-light illuminate 'to increase the backlight mode 具 具 具 具 of the optical composite film. In order to achieve the best light collecting effect, the concave lens ~ structure 35 is designed according to the concave lens formula % + % = ^ (the ί::: is the image distance, f is the focal length) to find the radius of curvature, and thus obtain The best collection of light effects =. According to a preferred embodiment of the present invention, the light collecting layer % / one and t is 3 to 1 〇〇 micrometer, and the curvature of each concave lens structure is half to 5 〇 1 〇 0 μm, preferably at a radius of curvature of At 50 microns, each concave lens, 纟. The distance h between the lowermost edge of the structure 35 and the first side of the substrate is less than 5 Å. Further, the material according to the present invention #=光层3〇 includes, but is not limited to, an acrylic resin or a % oxygen resin.凹 'The concave lens structure referred to in the present invention represents the characteristic that the junction I has a thin intermediate edge thickness; while the concave lens of the present invention is viewed from the bottom view, the shape of the U# may be circular, elliptical or diamond-shaped, and is not limited thereto. Furthermore, the concave lens structure of the present invention can be uniformly arranged on the light collecting layer or randomly distributed in the light collecting layer: == = = the knowledge can be pushed and understood by the knowledge. . 201024804 In the above embodiment of the invention, the prism structure is composed of a plurality of triangular columns, semi-cylindrical columns, trapezoidal columns, hemispherical structures, semi-elliptical spherical structures, pyramidal structures (such as triangular pyramids and quadrangular pyramids) or a combination thereof. It is understood that those skilled in the art will appreciate that the prism structure is not limited thereto, and other conventional rule structures are also possible in the present invention. The present invention utilizes a plurality of concave lens structures to concentrate the light source to reduce the loss of the light source. Therefore, the light collecting optical composite film of the present invention has better luminance as compared with the conventional brightness enhancing film, and thus the application thereof In the backlight module, the requirement of reducing the thickness of the backlight module can be achieved without loss of brightness of the screen. The third A and third B diagrams respectively show a side light source type backlight module 3 〇〇 and a lower light source type backlight module 300 having the concentrating optical composite film of the present invention. In the third embodiment, the backlight module 300 is constructed by a reflector 310, a light guide plate 320, the collected optical composite film 330 of the present invention, and a light source 350. The backlight module 300 shown in FIG. B is constructed by a reflecting plate 310, a diffusing plate 325, the collecting optical composite film 330 of the present invention, and a light source 350, and is disposed on the reflecting plate 310 and the diffusing plate 325. An air layer 340 is interposed therebetween. Comparing the structures shown in FIG. 3A and FIG. 3B, it can be found that the position of the light source of the backlight module 300 is different from the position of the light source of the backlight module 300'. In the backlight module 300, the light source 350 is disposed on the left side of the light guide plate 320, and the light source 350 of the backlight module 300' is disposed on the lower side of the diffusion plate 325 into the 201024804 - the light surface. Since the present invention utilizes a concave lens, each concave lens structure in the array collects light from the light source or light reflected from the light reflecting plate, so in the backlight module 3〇〇, the light collecting optical composite The light collecting layer of the film 33 is in contact with the light guide plate 320. In the backlight module 3', the light collecting layer of the light collecting optical composite film 330 is in contact with the diffusing plate 325. However, it should be understood by those skilled in the art that the backlight module of the present invention can further be combined with the conventional brightness enhancement film and diffusion plate, considering only the brightness of the curtain wall and regardless of the thickness of the backlight module. Use together. In summary, the concentrating optical composite film of the present invention has a special concentrating structure (concave lens structure), and thus has the advantages of high luminance and uniformity compared with the conventional storable film system. Advantageous advantages The light-collecting optical composite film of the present invention can replace the combination of the bright film and the diffusion film in the conventional back | % module, so that the thickness of the f-light module is reduced, thereby achieving the requirements of lightness, thinness and shortness. Any feature disclosed in the present disclosure can be used in any manner. The features disclosed in the present specification may be replaced with the same, equivalent or features. Thus, unless expressly stated otherwise, the features disclosed in the specification are a series of embodiments of the same or similar. In accordance with the disclosure of the present specification, the present invention can be easily changed and modified according to the different features and conditions of the present invention without departing from the spirit and scope of the present invention. Other implementation aspects are also included in the scope of the patent application. [Simple description of the figure] The first picture shows the structure of the conventional brightness enhancement film. The second A is a schematic representation of the concentrating optical composite film of the present invention. The second B is a partial schematic view of the light collecting optical composite film of the present invention. The third A is a schematic view of a side light source type backlight module having the concentrating optical composite film of the present invention. Figure 3B is a schematic view of a light source type backlight module having the concentrating optical composite film of the present invention. Φ [Major component symbol description] 10 Substrate 20 Prism structure 30 Light collecting layer 35 Concave lens structure 100 Conventional brightness enhancement film 200 Light collecting optical composite film 300 Backlight module 300, backlight module 310 Reflecting plate 320 Light guide plate 11 201024804 325 Diffuser 330 Collective Optical Composite Film 340 Air Layer 350 Light Source
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