201102712 六、發明說明： 【發明所屬之技術領域】 本發明是關於一種光學膜，特別是一種裝設於背光模 組内部的光學膜。 【先前技術】 近年來’傳統的陰極射線管顯示器（即俗稱的CRT 顯示器）已漸漸地被液晶顯示器所取代，主要原因在 於液晶顯示器所釋放出的輻射量遠遠小於CRT顯示 器，且液晶顯示器在這幾年的製造成本也顯著地降 低。一般來說，液晶顯示器包括背光模組與液晶面板 兩大部分’而背光模組的主要功用在於提供光源供液 晶顯示器使用。 睛參照圖1A，圖1A所纟會示為一習知的背光模組。 此背光模組100包括冷陰極螢光燈管（CCFL)llO、反 射罩120、導光板130、擴散膜142、增亮膜（Brightness Enhancement Film，俗稱：BEF) 144 與反射片 150， 冷陰極螢光燈管110用以產生光線，而反射罩120則 是用以將冷陰極螢光燈管11〇所產生的光線導引至導 光板130。導光板130的功用主要是將冷陰極螢光燈 管110所發出的光線導向至擴散膜142,而反射片150 的功用則是將從導光板130下方射出的光線再反射至 導光板130。擴散膜142的功效在使照射至液晶面板 (未繪示）的光線能更佳均勻，而較不會在液晶顯示 器的顯示面上產生亮度不均勻的現象。 201102712 擴散膜142主要由一基板142a與一擴散層142b 所構成，擴散層142b是設置在基板142a的表面上。 其中，擴散層142b的是由多個擴光圖案所組成，這些 擴光圖案為半球形狀，可將通過其中的光線擴散。另 外’為了增加於視角範圍的亮度，因此在擴散膜142 的上方加上增亮膜144,增亮膜144主要由一基板144a 與一結構層144b所構成，結構層144b是設置在基板 144a的表面上。結構層i44b是由多個菱鏡狀的微結構 所構成’故具有聚光的效果，可讓增亮膜144所射出 的光線之出光角度變小’進而增加背光模組1〇〇在視 角範圍内所呈現的亮度。 然而’當入射至增亮膜144的光線I!之角度較小 時，如圖1B所示，其容易被結構層144b的菱鏡狀微 結構所反射，這樣反而會使增亮膜144的輝度降低。 因此，如何減少光線被結構層144b反射的機率，是值 得本領域具有通常知識者去思考地。 【發明内容】 本發明之目的是提供一種光學膜，該光學膜能提 供較佳的輝度外，還能提供較佳的均勻度。、 根據上述目的與其他目的，本發明提供一種光學 膜，其包括：-基板、-黏著劑層、多個擴散粒子與: °其中’黏著_是披覆在基板上’ ^散粒^ ==者_所_。❹卜，紫外線硬化膠層是披覆在黏著 Θ曰，且’紫外線硬化膠層的表面上設有多個聚光結構。 201102712 層外於著劑 朦層間存料氣層。 s、、雜子與紫外線硬化 於上述之光學膜中，聚光結構呈菱鏡柱狀。 有擴，子’且擴散粒子與紫外線硬化 膠層Γ1存有4層，”會使光線的絲路徑產 f線較_光結軸，贱使光學膜具有較大的輝201102712 VI. Description of the Invention: [Technical Field] The present invention relates to an optical film, and more particularly to an optical film mounted inside a backlight module. [Prior Art] In recent years, 'conventional cathode ray tube display (commonly known as CRT display) has been gradually replaced by liquid crystal display, the main reason is that the amount of radiation released by the liquid crystal display is much smaller than that of the CRT display, and the liquid crystal display is The manufacturing costs in recent years have also been significantly reduced. Generally, a liquid crystal display includes a backlight module and a liquid crystal panel. The main function of the backlight module is to provide a light source for use in a liquid crystal display. Referring to FIG. 1A, FIG. 1A shows a conventional backlight module. The backlight module 100 includes a cold cathode fluorescent lamp (CCFL) 110, a reflector 120, a light guide plate 130, a diffusion film 142, a brightness enhancement film (BEF) 144 and a reflection sheet 150, and a cold cathode The light tube 110 is used to generate light, and the reflector 120 is used to guide the light generated by the cold cathode fluorescent tube 11 to the light guide plate 130. The function of the light guide plate 130 is mainly to guide the light emitted from the cold cathode fluorescent lamp 110 to the diffusion film 142, and the function of the reflection sheet 150 is to reflect the light emitted from the lower side of the light guide plate 130 to the light guide plate 130. The effect of the diffusion film 142 is to make the light irradiated to the liquid crystal panel (not shown) more uniform, and less likely to cause uneven brightness on the display surface of the liquid crystal display. 201102712 The diffusion film 142 is mainly composed of a substrate 142a and a diffusion layer 142b, and the diffusion layer 142b is disposed on the surface of the substrate 142a. The diffusion layer 142b is composed of a plurality of light-expanding patterns which are hemispherical in shape and can diffuse light passing therethrough. In addition, in order to increase the brightness of the viewing angle range, a brightness enhancement film 144 is added above the diffusion film 142. The brightness enhancement film 144 is mainly composed of a substrate 144a and a structure layer 144b, and the structure layer 144b is disposed on the substrate 144a. On the surface. The structural layer i44b is composed of a plurality of prism-shaped microstructures, so that it has the effect of collecting light, and the light-emitting angle of the light emitted by the brightness enhancing film 144 can be made smaller, thereby increasing the range of the backlight module 1 in the viewing angle range. The brightness presented inside. However, when the angle of the light I! incident on the brightness enhancing film 144 is small, as shown in FIG. 1B, it is easily reflected by the prismatic microstructure of the structural layer 144b, which in turn causes the brightness of the brightness enhancing film 144. reduce. Therefore, how to reduce the probability of light being reflected by the structural layer 144b is worth thinking about in the art. SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical film which provides better brightness and also provides better uniformity. According to the above and other objects, the present invention provides an optical film comprising: a substrate, an adhesive layer, a plurality of diffusion particles and: wherein the 'adhesive_ is overlaid on the substrate' ^ shots ^ == _ _ _. Further, the ultraviolet curable adhesive layer is coated on the adhesive crucible, and a plurality of light collecting structures are provided on the surface of the ultraviolet curable adhesive layer. 201102712 The layer is outside the layer of the agent. s, miscellaneous and ultraviolet light are hardened in the above optical film, and the condensing structure is in the shape of a prism. There are expansions, sub- and diffusion particles and UV-curing adhesive layer Γ1 has 4 layers," the light path of the wire will produce f-line _ light axis, so that the optical film has a larger glow
膜，Ϊ 的與其他目的’本發明再提供—種光學 、，、製作方法包括下述的步驟。首先，提供一美板 ^ ’將黏著劑與多個擴散粒子相混合， ^ ==佈在基板上以形成-賴層，其中=:Membrane, bismuth and other objects 'The invention further provides an optical, and manufacturing method comprising the following steps. First, a US plate is provided to mix the adhesive with a plurality of diffusion particles, and ^ == is disposed on the substrate to form a layer, wherein =:
鮮騎外。，將她_外線硬化 =佈在黏讀層的上方。之後，於紫外線硬化膠的上方形 成聚光結構。接著，對紫外線硬化膠進行光照以形成-紫外 線硬化膠層°然後’將硬化後的紫外線硬化膠層與黏著劑層 分離後，分離後的紫外線硬化膠層即為該光學膜。 於上述之光學膜中，基板的材質為聚對苯二甲酸乙二 酉旨。 於上述之光學膜中，擴散粒子的材質為有機材質。 於上述之光學膜中，聚光結構呈菱鏡柱狀。 根據上述目的與其他目的，本發明提供一種光學膜 的製作方法。首先，提供一基板。接著，將黏著劑與多個 擴散粒子相混合，且將混合後的黏著劑與擴散粒子塗佈在基 6 201102712 =形ΐΓϊ，’其中部分的擴散粒子是凸出於點著 再來’冑未硬化的紫外線硬化膠塗佈在黏著劑層 ㈣1之後’於料線硬化膠的上方軸聚光結構。接著, =夕線硬化膠進行光照以形成一紫外線硬化膠㉟，发中 化L紫外線硬轉層是麟著觸滅合。 為讓本發明之上述目的、特徵和優點更能明 下，下文將以實施例並配合所附圖示，作詳細說明如Fresh riding outside. , she will be hardened outside the viscous layer. Thereafter, a square is formed on the upper surface of the ultraviolet curable adhesive to form a light collecting structure. Next, the ultraviolet curable adhesive is irradiated to form an ultraviolet curable adhesive layer, and then the cured ultraviolet curable adhesive layer is separated from the adhesive layer, and the separated ultraviolet curable adhesive layer is the optical film. In the above optical film, the material of the substrate is polyethylene terephthalate. In the above optical film, the material of the diffusion particles is an organic material. In the above optical film, the condensing structure is in the shape of a prism. In accordance with the above and other objects, the present invention provides a method of fabricating an optical film. First, a substrate is provided. Next, the adhesive is mixed with a plurality of diffusing particles, and the mixed adhesive and the diffusing particles are coated on the base 6 201102712 = shape, 'part of the diffusing particles are convex and come again' The hardened ultraviolet hardening gel is applied to the upper axial concentrating structure of the strand hardening glue after the adhesive layer (4) 1 . Next, the illuminating gel is irradiated to form a UV-curable adhesive 35, and the hard-transformed layer of the neutralized L-violet light is lining. The above described objects, features, and advantages of the present invention will become more apparent from the embodiments and
【實施方式】 請參閱圖2,圖2所繪示為本發明之第一實施例 光學膜，此光學膜240包括一基板24卜一黏著劑層2犯、 多個擴散粒子243與紫外線硬化膠層244。黏著劑層242是 批覆在基板241上，擴散粒子243則是被黏著劑層242所^ 附，其中部份的擴散粒子243是凸出於黏著劑層242外。另 外’紫外線硬化膠層244是披覆在黏著劑層242上，且紫外 線硬化夥層244的表面上設有多個聚光結構24知。在本實施 例中，這些聚光結構244a呈菱鏡柱狀，當然本領域具有通常 知識者也可將聚光結構244a設計成其他的形狀，例如：金字 塔狀、三角錐狀、凸透鏡狀等，只要能發揮聚光的功能即可。 在此，擴散粒子243的材質為有機透明材質，此有機透 明材質例如為聚甲基丙烯酸甲酯（p〇lymethyl[Embodiment] Please refer to FIG. 2. FIG. 2 illustrates an optical film according to a first embodiment of the present invention. The optical film 240 includes a substrate 24, an adhesive layer 2, a plurality of diffusion particles 243 and an ultraviolet curing adhesive. Layer 244. The adhesive layer 242 is coated on the substrate 241, and the diffusion particles 243 are attached by the adhesive layer 242, and a part of the diffusion particles 243 protrude from the adhesive layer 242. Further, the ultraviolet curable adhesive layer 244 is coated on the adhesive layer 242, and a plurality of light collecting structures 24 are provided on the surface of the ultraviolet hardening layer 244. In this embodiment, the concentrating structures 244a are in the shape of a prismatic column. Of course, those skilled in the art can also design the concentrating structure 244a into other shapes, such as a pyramid shape, a triangular pyramid shape, a convex lens shape, and the like. As long as you can use the function of collecting light. Here, the material of the diffusion particles 243 is an organic transparent material, and the organic transparent material is, for example, polymethyl methacrylate (p〇lymethyl).
Methacrylate，簡稱：PMMA )、聚碳酸酯 (Polycarbonate ’ 簡稱：pC)、聚苯乙烯（p〇lystyrene， 簡稱：PS)、曱基丙烯酸甲酯與苯乙烯單體的共聚物 201102712 ((Methyl Methacrylate) Styrene，簡稱 MS)、聚丙烯 (Polypropene ’ 簡稱 PP )、聚乙烯（p〇iyethyiene，簡 稱PE )、聚對笨二甲酸乙二酿（p〇iyethyiene terephthalate，簡稱PET)，較佳為曱基丙稀酸甲酯與 苯乙烯單體的共聚物。 而且’擴散粒子243的折射率與黏著劑層242不同，當 光線通過擴散粒子243與黏著劑層242的介面時，其折角會 產生變化，故會讓光線產生擴散的效果。另外，由於部份的 擴散粒子243是凸出於黏著劑層242外，也就是說有些擴散 粒子243並未被黏者劑層242所披覆，而這些擴散粒子243 與紫外線硬化膠層244間容易存有空氣層245，因此當光線 經過擴散粒子243與空氣層245的交界處及空氣層245與黏 著劑層242的交界處時，其折角皆會產生變化，而這些都會 進一步讓光線產生擴散的效果。 因此’當入射至光學膜240的光線之角度較小時， 其在上述之擴散粒子243與空氣層245所產生的折射作用 下’光學路徑已經改變，故容易從聚光結構244a射出。這 樣一來’光學膜240所產生的輝度便會大於習知的增 亮膜144 (繪示於圖1B)。 接著’發明人將此光學膜240取代習知背光模級 100中的擴散膜142與增亮膜144，並進行光學試驗， 結果發現使用光學膜240的背光模組之輝度較習知背 光模組100的輝度高17%。此外，使用光學膜24〇的 背光模組之均勻度為88.14%，習知的背光模組10〇之 均勻度為87.26%。在此，均勻度是指：（最暗點的輝 201102712 度）/ (最亮點的輝度）xlo〇%。综上 實施例的光學膜240除了具有較A / 較大的均勻度。 卜也具有 再主來’將對上述之光學膜24〇的製作方式作一介 、，、口。明參照圖3A〜圖3D，圖3A m in仏_ 240的製作产铲昔生圖繪示出光學膜 ^241 ， 於成一黏著劑層242’其中部份的擴散粒子243 ΐ 外。之後，如圖冗所示，待黏著劑 =’將未硬化的紫外線硬化膠244,塗佈在黏著劑 層的上方’並於紫外線硬化膠244,上形成多個聚光結構 =½接=絲統構純例如是制滾輪賴的方式而形 化# ^，^圖3D所示，使用一紫外線光源2〇對紫外線硬 ^膠2料進行光照以使其硬化並形成—紫外線硬化谬層 藉由上述之製私，便可形成圖2所示的光學膜獨。在 ^實=例中’黏著劑層的材質較佳為紫外線硬化璆，這樣一 來^外線硬化膠層244便容易與黏著劑層撕相結合，而 不谷易剝落。 接著，請參照圖4,圖4所繪示為本發明之第二實 =的光學膜240，。此光學冑24〇,的製作流程與光學 丰仂相似，所不同的地方在於：在完成圖3D所示的 /驟後’將糸外線硬化膠層244撕離，便形成光學膜24〇,。 在本實施例中，光學膜240,的其中一特徵在於：其下 201102712 方面幵/成有多個凹槽24〇a’。由於在圖犯所示的步 驟㈣的擴散粒子243會凸出於黏著劑層242外，故當 ，硬化的紫外線硬化膠辦塗佈在黏著劑層2似的上方後 、’曰不於圖3C) ’紫外線硬化膠244’的下方便會形成多個 擴散粒子243的輪廓相匹配的凹槽2術，。*且，由於每 :個擴散粒子243的大小會有差異（繪示於圖3C)，且擴 政粒子243在點著劑層242中的分佈也並非完全均勻，故形 成的這些^槽24〇a，會呈不規則的分佈，且每個凹槽 24〇a的冰度也不盡相同，也因此光學膜240,具有較佳 的光擴散能力。 本發明以實施例說明如上，然其並非用以限定本 發明所主張之專利權利範圍。其專利保護範圍當視後 附之申請專利範圍及其等同領域而定。凡本領域具有 ，常矣識者，在不脫離本專利精神或範圍内，所作之 更動或潤飾，均屬於本發明所揭示精神下所完成之等 效改變或設計，且應包含在下述之申請專利範圍内。 【圖式簡單說明】 圖1A所繪示為一習知的背光模組。 圖1B所繪示為增亮膜的光學路徑圖。 圖2所繪示為本發明之第一實施例的光學膜。 圖3A〜圖3D繪示出光學膜的製作流程。 圖4所繪示為本發明之第二實施例的光學膜。 201102712 【主要元件符號說明】 <先前技術> 100 :背光模組 110 :冷陰極螢光燈管 120 :反射罩 130 :導光板 142 :擴散膜 142a :基板 142b :擴散層 144 :增亮膜 144a :基板 144b :結構層 150 :反射片 Ij :光線 <實施方式> 20 :紫外線光源 240 :光學膜 241 :基板 242 :黏著劑層 243 :擴散粒子 244 :紫外線硬化膠層 201102712 244’ ：未硬化的紫外線硬化膠 244a :聚光結構 245 :空氣層 240’ ：光學膜 240a’ ：凹槽Methacrylate (PMMA), polycarbonate (Polycarbonate 'abbreviation: pC), polystyrene (p〇lystyrene, PS for short), copolymer of methyl methacrylate and styrene monomer 201102712 ((Methyl Methacrylate) Styrene (MS), polypropylene (Polypropene 'PP), polyethylene (p〇iyethyiene, PE), p〇iyethyiene terephthalate (PET), preferably mercapto a copolymer of dilute methyl ester and styrene monomer. Further, the refractive index of the diffusion particles 243 is different from that of the adhesive layer 242. When the light passes through the interface between the diffusion particles 243 and the adhesive layer 242, the folding angle thereof changes, so that the light is diffused. In addition, since some of the diffusion particles 243 protrude from the adhesive layer 242, that is, some of the diffusion particles 243 are not covered by the adhesive layer 242, and the diffusion particles 243 and the ultraviolet curing adhesive layer 244 are interposed. The air layer 245 is easily stored, so when the light passes through the boundary between the diffusion particle 243 and the air layer 245 and the boundary between the air layer 245 and the adhesive layer 242, the folding angle thereof changes, and these further diffuse the light. Effect. Therefore, when the angle of the light incident on the optical film 240 is small, the optical path has changed under the above-described refractive action by the diffusion particles 243 and the air layer 245, so that it is easily emitted from the light collecting structure 244a. As a result, the optical film 240 produces a greater brightness than the conventional brightness enhancing film 144 (shown in Figure 1B). Then, the inventor replaced the diffusion film 142 and the brightness enhancement film 144 in the conventional backlight module 100 with an optical test, and found that the brightness of the backlight module using the optical film 240 is higher than that of the conventional backlight module. The brightness of 100 is 17% higher. In addition, the uniformity of the backlight module using the optical film 24 is 88.14%, and the uniformity of the conventional backlight module 10 is 87.26%. Here, the uniformity means: (the darkest point of the glow 201102712 degrees) / (the brightest point of the luminance) xlo〇%. In summary, the optical film 240 of the embodiment has a greater A/large uniformity. Bu also has the principle of making the above-mentioned optical film 24〇. Referring to Figures 3A to 3D, the fabrication of the Fig. 3A m in仏-240 shows an optical film ^241 which is formed by a portion of the diffusion particles 243 of the adhesive layer 242'. After that, as shown in the figure, the adhesive to be pressed = 'un hardened ultraviolet curing adhesive 244, coated on the upper layer of the adhesive layer' and formed on the ultraviolet curing adhesive 244, a plurality of concentrating structures are formed = 1 wire The structure is purely formed by the method of roller-rolling. ^ ^, ^, as shown in Fig. 3D, an ultraviolet light source 2 is used to illuminate the ultraviolet hard rubber material to harden it and form a UV-hardened layer. The optical film described above can form the optical film alone as shown in FIG. In the case of the actual example, the material of the adhesive layer is preferably UV-cured, so that the outer hardened adhesive layer 244 is easily combined with the adhesive layer tearing, and the valley is not easily peeled off. Next, please refer to FIG. 4. FIG. 4 illustrates the second optical film 240 of the present invention. The optical 胄 24 〇 was produced in a process similar to that of optical phoenix, except that the ruthenium outer hard layer 244 was peeled off after completion of the /step shown in Fig. 3D to form an optical film 24 〇. In the present embodiment, one of the characteristics of the optical film 240 is that a plurality of grooves 24A' are formed in the next 201102712 aspect. Since the diffusion particles 243 in the step (4) shown in the figure protrude out of the adhesive layer 242, when the hardened ultraviolet curing adhesive is applied over the adhesive layer 2, it is not as shown in Fig. 3C. The lower convenience of the 'ultraviolet hardening glue 244' will form a groove 2 of the contour of the plurality of diffusion particles 243. *And, since the size of each of the diffusion particles 243 is different (shown in FIG. 3C), and the distribution of the diffusion particles 243 in the dot agent layer 242 is not completely uniform, the formed grooves 24〇 a, will be irregularly distributed, and the ice of each groove 24〇a is also different, and thus the optical film 240 has better light diffusing ability. The present invention is described by way of example, and is not intended to limit the scope of the claims. The scope of patent protection is subject to the scope of the patent application and its equivalent. Any changes or designs made in the spirit of the present invention, which are within the spirit or scope of the present invention, are intended to be included in the following claims. Within the scope. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A illustrates a conventional backlight module. FIG. 1B is an optical path diagram of a brightness enhancement film. 2 is a view showing an optical film according to a first embodiment of the present invention. 3A to 3D illustrate a manufacturing process of an optical film. Fig. 4 is a view showing an optical film according to a second embodiment of the present invention. 201102712 [Description of main component symbols] <Prior Art> 100: Backlight module 110: Cold cathode fluorescent lamp 120: Reflector 130: Light guide plate 142: Diffusion film 142a: Substrate 142b: Diffusion layer 144: Brightness enhancement film 144a: substrate 144b: structural layer 150: reflective sheet Ij: light ray <embodiment> 20: ultraviolet light source 240: optical film 241: substrate 242: adhesive layer 243: diffusion particle 244: ultraviolet light-resistant adhesive layer 201102712 244': Unhardened ultraviolet curable adhesive 244a: concentrating structure 245: air layer 240': optical film 240a': groove
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