M409434 五、新型說明： 【新型所屬之技術領域】 本新型是有關於一種光學膜片’特別是指一種應用於 一液晶顯示器中的光學膜片。 【先前技術】 液日日顯不 iS (Liquid Crystal Display，簡稱為 LCD)之 背光模組的結構’一般是包含冷陰極燈管、導光板、集光 器與各種光學膜（如增亮膜片/聚光膜片/稜鏡片、擴散膜 片、複合功能型光學膜片…）等部份，其中，尤以光學膜者 是對背光膜組的效率扮演相當重要的關鍵角色。 如圖1所示，現有一聚光片丨是包含一基板U，以及 夕數依序鄰接並列在該基板11之一表面上的棱柱條12。 其中，任二相鄰稜柱條12之相交接處是形成一近直角狀 的尖角形波谷13。主要是’利用稜柱條12之表面能折射 光線’及其内部能使光線產生全反射，以達到將光線集中 在既定視角内的聚光效果。 然而’當光線由下往上地穿透過該聚光片1時，每一 稜柱條12之平滑表面只能在一維方向產生折射光線，目 前發現此種設計方式容易侷限光線射出之角度，整體對顯 示器而言’將導致產生縮小觀看者之可視角度的缺點。另 外’由於此類聚光片1之任二相鄰稜柱條12之相交接處 所形成近直角狀的尖角形波谷13,會構呈一條長直的波谷 共線’此種設計不但容易造成疊紋現象（m〇ire )，亦會產 生輝度不均的問題。 3 M409434 【新型内容】 因此，本新型之目的，即在提供一種有助於增加可視 角度之光學膜片》 於是，本新型之光學膜片，包含一基板，以及一稜柱 光學層，該基板具有一第一表面，以及一相反於該第一表 面的第二表面。該增亮結構層具有多數依序鄰接並列在該 基板之第一表面上的稜柱條，任二相鄰棱柱條之相交接處 是形成一弧凹形波谷。 本新型之功效在於，利用任二相鄰稜柱條之相交接處 是形成一弧凹形波谷的結構設計，能讓整體於霧度與輝度 等特性上皆有良好的表現。 【實施方式】 有關本新型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五個較佳實施例的詳細說明中，將可 清楚的呈現。 在本新型被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 如圖2與圖3所示，本新型之光學膜片2的一第一較 佳實施例’是能應用於一顯示器（圖中未示）中，並包含一 基板21，以及一增亮結構層22。 該基板21具有一第一表面2U，以及一相反於該第一 表面211的第二表面212。其中，該基板21除了需具有透 光性外，其材質能是以下所列舉材質製成，諸如聚對苯二 甲酸乙一醋（polyethylene terephthalate，PET)、聚醯亞胺 4 M409434 (polyimide ’ PI)、聚碳酸 g旨（p〇iyCarb〇nate，PC)、聚甲基 丙烯酸曱酯（polymethyl methacrylate，PMMA)、聚乙烯 (polyethylene ’ PE)、聚丙稀（polypropylene ’ PP)、聚胺 酯樹酯（polyurethane resin)、三醋酸纖維素（triacetyl cellulose，TAC)等。M409434 V. New description: [New technical field] The present invention relates to an optical film', particularly to an optical film applied to a liquid crystal display. [Previous Technology] The structure of a liquid crystal display (LCD) backlight module generally includes a cold cathode lamp, a light guide plate, a concentrator, and various optical films (such as a brightness enhancement film). / concentrating film / bismuth film, diffusion film, composite functional optical film ...), among them, especially the optical film is a key role in the efficiency of the backlight film group. As shown in FIG. 1, a conventional concentrating sheet 包含 is a prism strip 12 including a substrate U and a plurality of singularly adjacently juxtaposed on one surface of the substrate 11. Wherein, the intersection of any two adjacent prism strips 12 forms a nearly right-angled pointed trough 13 . The main purpose is to use the surface of the prism strip 12 to refract light and its interior to cause total reflection of the light to achieve a concentrated effect of focusing the light within a given viewing angle. However, when the light penetrates the concentrating sheet 1 from bottom to top, the smooth surface of each prism strip 12 can only refract light in one dimension. It has been found that this design method is easy to limit the angle at which light is emitted. 'For the display' will result in the disadvantage of reducing the viewing angle of the viewer. In addition, since the intersection of any two adjacent prism strips 12 of such a concentrating sheet 1 forms a nearly right-angled pointed-shaped trough 13, it will form a long straight trough collinear line. This design is not only easy to cause embossing phenomenon. (m〇ire), there will also be problems of uneven brightness. 3 M409434 [New content] Therefore, the object of the present invention is to provide an optical film which helps to increase the viewing angle. Thus, the optical film of the present invention comprises a substrate and a prismatic optical layer, the substrate having a first surface and a second surface opposite the first surface. The brightness enhancing structure layer has a plurality of prism strips which are sequentially adjacent to each other and arranged on the first surface of the substrate. The intersection of any two adjacent prism strips forms an arc concave trough. The effect of the novel is that the design of the intersection of any two adjacent prism strips is to form an arc concave trough, which can make the overall performance of haze and brightness. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals. As shown in FIG. 2 and FIG. 3, a first preferred embodiment of the optical film 2 of the present invention can be applied to a display (not shown) and includes a substrate 21 and a brightening structure. Layer 22. The substrate 21 has a first surface 2U and a second surface 212 opposite the first surface 211. The substrate 21 is made of the following materials in addition to light transmissive properties, such as polyethylene terephthalate (PET), polyimine 4 M409434 (polyimide 'PI). , polycarbonate g (p〇iyCarb〇nate, PC), polymethyl methacrylate (PMMA), polyethylene (polyethylene 'PE), polypropylene (PP), polyurethane resin (polyurethane resin) ), triacetyl cellulose (TAC), and the like.
該增亮結構層22具有多數依序鄰接並列在該基板21 之第一表面211上的稜柱條221，每一棱柱條221是呈直 向延伸狀’且其頂端是呈尖角狀，特別是，任二相鄰稜柱 條221之相交接處是形成一弧凹形波谷222,每一波谷222 的曲率半徑是介於0.5微米（μηι)〜5微米（μιη)之間。The brightness-increasing structure layer 22 has a plurality of prism strips 221 which are sequentially adjacent to each other and juxtaposed on the first surface 211 of the substrate 21. Each of the prism strips 221 has a straight extension shape and a tip end thereof is pointed, in particular The intersection of any two adjacent prism strips 221 forms an arc concave valley 222, and the radius of curvature of each of the valleys 222 is between 0.5 micrometers (μηι) and 5 micrometers (μιη).
其中’該增亮結構層22的材質可以是選自於下列物： 丙稀酸g旨（acrylate )、胺甲酸乙g旨丙烯酸g旨（urethane acrylate)、聚酯丙烯酸醋（p〇lyester acrylate)、環氧丙稀酸 酯（epoxy acrylate)、乙氧基化酚丙烯酸酯（phenol ethoxylated acrylate)、乙氧基化雙酚 A 丙烯酸酯（bisphenol A ethoxylated acrylate)、苯環氧丙烯酸酯（phenyl epoxy acrylate)、鄰-笨基苯齡乙基丙稀酸醋（〇-phenylphenol ethyl acrylate)、苯硫乙基丙烯酸酉旨（phenylthioethyl acrylate)、 苯曱基丙稀酸酯（benzyl acrylate)、六官能基之芳香族胺甲 酸乙醋(hexafunctional aromatic urethane) ' 雙紛-A 環氧 丙浠酸酯（bisphenol A epoxy acrylate )、酴搭環氧丙稀酸 酯（novolac epoxy acrylate)、聚酯二丙烯酸酯（p〇iyester diacrylate )，或此等之一組合。 主要是’當光線由下往上地穿通過該光學膜片2時， 5 M409434 稜柱條221之平滑表面能產生折射光線，且其内部能使光 線產生全反射，以達到集光/聚光效果，特別是，利用任 二相鄰稜柱條221之相交接處是形成弧凹形波谷222的結 構設計，能避免光線射出後過度集中於正前方，並擴大光 線射出角度，不僅能增加顯示器之可視角度，也能防止光 學疊紋現象產生，讓輝度更加均勻，改善一般聚光片（見 圖丨）容易產生不均勻輝度等問題，並更可進一步減緩牛頓 環（Newton’s Ring)…等光學瑕疵。 如圖4所示，為本新型之光學膜片2的一第二較佳實 施例，與上述該第一較佳實施例不同處在於，該光學膜片 2之增亮結構層22之每一稜柱條221具有一柱本體223， 以及多數分散地摻埋在該柱本體223内部中的微粒224， 别述微粒乃是選自於壓克力系或矽膠等材質其中之一。 因此，透過該增亮結構層22之每一柱本體223中填 充有分散微粒224的設計，因柱本體223與微粒224間的 折射率差異，造成穿經過該增亮結構層22的光線會不斷 產生折射、反射與繞射現象，藉以能讓光線分布足夠均 勻，且防止光學疊紋的發生，故本實施例之光學膜片2同 樣能兼具霧度良好與輝度均勻等光學特性。 如圖5所示，為本新型之光學膜片2的一第三較佳實 她例，與上述該第二較佳實施例不同處在於，該光學膜片 2更包含一設置在該基板21之第二表面212上且其表面凹 不平正的擴散結構層23。該擴散結構層23具有多數大 J不均之透明狀的顆粒23 1 ’以及一用以將該多數顆粒23 1 M409434 固著在該基板21之第二表面212上的固著劑232。而且， 該擴散結構層23的表面粗糙度（RZ)是介於〇.〇5μπι 〜1.5 μ m之間。 其中’該固著劑232可以是UV樹脂（UV-curing resin)、熱固性樹脂（thermosetting resin)等，但並不受此限 制。更詳細來說，若該固著劑232是UV樹脂者，其可以 疋選自於下列物：至少具有六官能基之脂肪族胺甲酸乙酯 养聚物（aliphatic urethane oligomer)、環氧丙烯酸醋（epoxy acrylate)、雙酚 _A 環氧丙烯酸酯（bisphen〇1_A ep〇xy acrylate)、齡路環氧丙烯酸酯（n〇v〇iac ep0Xy acryiate)、聚 醋二丙烯酸酯（p〇lyester diacrylate)，或此等之一組合；而 若違固著劑232是熱固性樹脂者’則可以是環氧樹脂 (epoxy resin)、醇酸樹脂（aikyd resin)等。當然，為了確保 該固著劑232能達到預定的物化結構特性，也可以同時加 入一些添加劑，例如：硬化劑、光起始劑（ph〇t〇initiat〇r)、 平坦劑（leveling agent)、潤滑劑（lubricant)，及抗污劑 (antifoulant)…等。 因此，當光線由下往上地穿透經該光學膜片2時，因 擴散結構層23之顆粒231與固著劑232間的折射率差異， 造成穿透該擴散結構層23的光線，同樣地，該擴散結構 層23之顆粒231結構會讓光線會不斷產生折射、反射與 繞射現象，以達到良好的擴散、均勻化效果，接著，光線 會繼續穿透該增免結構層22，透過任二相鄰稜柱條2^丄 之相交接處形成弧凹形波谷222，以及每一柱本體223中 7 M409434 填充有分散微粒224等結構設計，讓光線能有效集中且足 夠均勻化’防止疊紋現象產生，故本實施例之光學膜片2 於霧度與輝度等光學特性表現上同樣是相當良好。 >如圖6所示，為本新型之光學膜片2的一第四較佳實 .把例―，與上述該第一較佳實施例不同處在於該光學膜片 2之每一稜柱條221的頂端是呈彎弧狀。同樣地，該光學 膜片2也兼具霧度與輝度冑良好的光學特性。 ♦如圖7所示，為本新型之光學膜片2的一第五較佳實 _ ’與上述該第一較佳實施例不同處在於，該光學膜2 之母一稜柱條221是呈彎曲延伸狀。當然，該光學膜片2 也同樣是兼具良好霧度與輝度均勻等光學特性。 歸納上述’本新型之光學膜片2,利用任二相鄰棱柱 ” 221之相交接處是形成一弧凹形波谷222的結構設計， 大光線射出角度以增加可視角，同時能兼具於 輝度與霧度特性上達到均勾平衡表現的特性， 到本新型之目的。 崎霄J違 惟以上所述者，僅為本新型之較佳實施例而已， 能以此限定本新型實施之範圍’即大凡依本新型申請:利 I已圍及新型說明内容所作之簡單的等效變化與修飾，皆仍 屬本新型專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一側視圖，說明現有一聚光片的結構； 佳實施例，其任二稜柱條的相交接處是形成 圖2是一側視圖，說明本新型之光學膜片的j第一較 弧凹形波 M409434 圖3是一立體圖，說明該第一較佳實施例之每一稜柱 條是呈直向延伸狀； 圖4是一側視圖，說明本新型之光學膜片的一第二較 佳實施例’其每一棱柱條摻埋有多數微粒； 圖5是一側視圖，說明本新型之光學膜片的一第三較The material of the brightening structure layer 22 may be selected from the group consisting of: acrylic acid acrylate, urethane acrylate, and polyester acrylate (p〇lyester acrylate). , epoxy acrylate, phenol ethoxylated acrylate, bisphenol A ethoxylated acrylate, phenyl epoxy acrylate ), phenyl-phenylphenol ethyl acrylate, phenylthioethyl acrylate, benzyl acrylate, hexafunctional Hexafunctional aromatic urethane 'bisphenol A epoxy acrylate, novolac epoxy acrylate, polyester diacrylate (p 〇iyester diacrylate ), or a combination of these. Mainly 'when the light passes through the optical film 2 from bottom to top, the smooth surface of the 5 M409434 prismatic strip 221 can produce refracted light, and the inside can make the light totally reflect to achieve the light collecting/concentrating effect. In particular, the intersection of any two adjacent prismatic strips 221 is a structural design of forming the arc-shaped concave troughs 222, which can prevent the light from being excessively concentrated in front of the light and expand the light emission angle, thereby not only increasing the visibility of the display. The angle can also prevent the occurrence of optical moiré, make the brightness more uniform, improve the problem that the general concentrating sheet (see Fig. 容易) is prone to uneven brightness, and further slow down the optical enthalpy such as Newton's Ring. As shown in FIG. 4, a second preferred embodiment of the optical film 2 of the present invention differs from the first preferred embodiment described above in that each of the brightness enhancing structure layers 22 of the optical film 2 is The prism strip 221 has a column body 223 and a plurality of particles 224 dispersedly embedded in the interior of the column body 223. The particles are selected from one of materials such as acrylic or silicone. Therefore, the design of each of the column bodies 223 of the brightness enhancing structure layer 22 filled with the dispersed particles 224 causes the light passing through the brightness enhancing structure layer 22 to constantly flow due to the difference in refractive index between the column body 223 and the particles 224. The phenomenon of refraction, reflection and diffraction is generated, so that the light distribution is sufficiently uniform and the occurrence of optical moiré is prevented. Therefore, the optical film 2 of the present embodiment can also have optical characteristics such as good haze and uniform brightness. As shown in FIG. 5, a third preferred embodiment of the optical film 2 of the present invention is different from the second preferred embodiment in that the optical film 2 further includes a substrate 21 disposed thereon. The diffusion structure layer 23 on the second surface 212 and having a concave surface on the surface thereof. The diffusion structure layer 23 has a plurality of large-diameter transparent particles 23 1 ' and a fixing agent 232 for fixing the plurality of particles 23 1 M409434 on the second surface 212 of the substrate 21. Moreover, the surface roughness (RZ) of the diffusion structure layer 23 is between 〇.5 μm to 1.5 μm. Wherein the fixing agent 232 may be a UV-curing resin, a thermosetting resin or the like, but is not limited thereto. In more detail, if the fixing agent 232 is a UV resin, it may be selected from the group consisting of an aliphatic urethane oligomer having at least a hexafunctional group, and an epoxy acrylate vinegar. (epoxy acrylate), bisphenol_1 ep〇xy acrylate, 〇v环氧iac ep0Xy acryiate, p〇lyester diacrylate Or a combination of these; and if the fixing agent 232 is a thermosetting resin, it may be an epoxy resin, an akyky resin, or the like. Of course, in order to ensure that the fixing agent 232 can achieve the predetermined physical and chemical structure characteristics, it is also possible to add some additives at the same time, for example, a hardener, a photoinitiator, a leveling agent, Lubricant, antifoulant, etc. Therefore, when the light penetrates through the optical film 2 from bottom to top, the difference in refractive index between the particles 231 of the diffusion structure layer 23 and the fixing agent 232 causes light to penetrate the diffusion structure layer 23, also The structure of the particles 231 of the diffusion structure layer 23 causes the light to continuously refract, reflect and diffract to achieve good diffusion and homogenization effects, and then the light continues to penetrate the enhancement structure layer 22, The intersection of any two adjacent prism strips 2^丄 forms arc-shaped concave troughs 222, and the structure of 7 M409434 in each column body 223 is filled with dispersed particles 224, so that the light can be effectively concentrated and sufficiently uniformed to prevent stacking Since the grain phenomenon occurs, the optical film 2 of the present embodiment is also excellent in optical performance such as haze and luminance. > As shown in Fig. 6, a fourth preferred embodiment of the optical film 2 of the present invention is different from the first preferred embodiment described above in each prismatic strip of the optical film 2. The top of 221 is curved. Similarly, the optical film 2 also has good optical characteristics of haze and luminance. ♦ As shown in FIG. 7 , a fifth preferred embodiment of the optical film 2 of the present invention is different from the above-described first preferred embodiment in that the mother prismatic strip 221 of the optical film 2 is curved. Extended shape. Of course, the optical film 2 also has optical characteristics such as good haze and uniform brightness. The intersection of the above-mentioned 'optical diaphragm 2 of the present invention, using any two adjacent prisms 221' 221 is a structural design for forming an arc-shaped concave trough 222, and the large light is emitted at an angle to increase the viewing angle, and at the same time, can be combined with the luminance. It is the purpose of this new type to achieve the characteristics of the balance of the haze characteristics. The above mentioned, only the preferred embodiment of the present invention, can limit the scope of the new implementation. That is to say, according to the new application, the simple equivalent changes and modifications made by Lee I and the new description are still within the scope of this new patent. [Simplified illustration] Figure 1 is a side view illustrating The structure of the existing concentrating sheet; the preferred embodiment, the intersection of any two prismatic strips is formed. FIG. 2 is a side view illustrating the first arc-shaped concave wave M409434 of the optical film of the present invention. FIG. A perspective view showing that each of the prismatic strips of the first preferred embodiment extends in a straight direction; and FIG. 4 is a side view showing a second preferred embodiment of the optical film of the present invention. The strip is embedded with a plurality of particles; Figure 5 is a side view showing a third comparison of the optical film of the present invention
一第四較a fourth comparison
實施例，其每一稜桎條是呈彎曲 延伸狀。 一第五較 M409434 【主要元件符號說明】 2 光學膜片 222 波谷 21 基板 223 柱本體 211 第一表面 224 微粒 212 第二表面 23 擴散結構層 22 增亮結構層 231 顆粒 221 複柱條 232 固著劑 10In an embodiment, each of the ridges has a curved extension. A fifth M409434 [Major component symbol description] 2 Optical diaphragm 222 Valley 21 Substrate 223 Column body 211 First surface 224 Particles 212 Second surface 23 Diffusion structure layer 22 Brightening structure layer 231 Particles 221 Composite column 232 Fixing Agent 10