M331676 96-12-10 八、新型說明： 【新型所屬之技術領域】 本創作是有關於一種光學元件，且特別是有關於一種 具有較大視角之光學膜片。 【先前技術】 一般光學膜片常應用於液晶顯示器中。液晶顯示器主 要是由一液晶顯示面板（liquid crystal display panel，LCD panel)與一背光模組所構成。由於液晶顯示面板並不具有 主動發光的功能，故在液晶顯示面板下方須配置一背光模 組以提供均勻的面光源，以使液晶顯示面板能達到顯示的 目的。該背光模組的組成包括發光元件、導光板、擴散片、 偏光板、冷光板等元件，背光模組之上可能還有顯像單元， 此類結構為所屬技術領域具有通常知識者所知悉，故不贅 述。為了使背光模組能呈現出良好的光學效果，上述背光 模組經常會包括以交互堆疊的方式配置多片稜鏡片（prism sheet) ’以提升背光模組所產生面光源之亮度。 圖1是習知之稜鏡片交互堆疊之示意圖。請參考圖i， 習知稜鏡片100之堆疊方向一般是相互垂直。當外界之光 線L穿過稜鏡片1〇〇後’會受到稜鏡片1〇〇之聚光作用， 而能呈現更高的亮度。值得注意的是，如圖丨所示棱鏡片 100之堆疊方式’容易使光線自堆疊之稜鏡片100出射後 呈現不均勻的光紋’特別是在前述兩片稜鏡片紋路交會處 與其他區域的光學效果差異極大，此種固定間隔的明暗紋 路變化以及兩片稜鏡片垂直擺放的交互影響，將產生所謂 4 M331676 96-12-10 的疊紋效應（MoiMEffect)，嚴重影響液晶顯示面板的顯 像品質。亦即，上述稜鏡片1〇〇的結構及其堆疊方式會造 成背光模組無法有效提供均勻的面光源，導致液晶顯示面 板之顯示品質下降。 另一方面，由於稜鏡片1〇〇之表面為鋸齒狀結構，鋸 齒狀結構會影響背光模組之光學效果，因此光線L由堆疊 之稜鏡片100出射後會集中於液晶顯示面板之前視區域， 導致使用者不易由液晶顯示面板之側視區域觀看到液晶顯 示面板所顯示之畫面，亦即使用者視覺感受上的視角狹小。 綜合上述，習知之稜鏡片1〇〇實有改進之必要。 【新型内容】 本創作提供一種光學膜片，其具有較大視角。 本創作提出一種光學膜片，其包括一透光基材以及多 個配置於透光基材上之第一棱鏡。每_個第一棱鏡呈有一 第一外凸曲面以及一第一内凹曲面，其中第一外凸曲面與 弟一内凹曲面相接以形成一第》—頂端。 在本創作之一實施例中，每一個第一稜鏡與相鄰另一 第一稜鏡的交接方式包括二個第一外凸曲面交接、二個第 一内凹曲面交接以及一個第一外凸曲面與一個第一内凹曲 面交接。 在本創作之一實施例中，第一外凸曲面以及第一内凹 曲面之曲率半徑大於或等於31.2μΙη。 在本創作之一實施例中，每一個第一頂端與透光基材 5 M331676 96-12-10 之間的距離為一第一預定距離，第一預定距離介於 ΙΟμπι〜40μπι 之間。 在本創作之一實施例中，光學臈片更包括多個第二稜 鏡，每一個第二稜鏡具有一第二外凸曲面以及一第二内凹 曲面。M331676 96-12-10 VIII. New description: [New technical field] The present invention relates to an optical element, and in particular to an optical film having a large viewing angle. [Prior Art] A general optical film is often used in a liquid crystal display. The liquid crystal display is mainly composed of a liquid crystal display panel (LCD panel) and a backlight module. Since the liquid crystal display panel does not have the function of active illumination, a backlight module must be disposed under the liquid crystal display panel to provide a uniform surface light source, so that the liquid crystal display panel can achieve the purpose of display. The backlight module comprises components such as a light-emitting element, a light guide plate, a diffusion sheet, a polarizing plate, a cold-light plate, and the like, and a developing unit may be further disposed on the backlight module. Such a structure is known to those of ordinary skill in the art. Therefore, I will not repeat them. In order to enable the backlight module to exhibit good optical effects, the backlight module often includes a plurality of prism sheets disposed in an interactive stacking manner to enhance the brightness of the surface light source generated by the backlight module. FIG. 1 is a schematic diagram of a conventional stacking of cymbals. Referring to FIG. 1, the stacking directions of the conventional cymbals 100 are generally perpendicular to each other. When the external light L passes through the cymbal 1 ’, it will be concentrated by the cymbal 1 ,, and it can exhibit higher brightness. It is worth noting that the stacking pattern of the prism sheets 100 as shown in the figure 'easily causes the light to appear unevenly from the stacked cymbals 100', especially at the intersection of the two ridges and other regions. The optical effects vary greatly. The interaction between the bright and dark lines of the fixed interval and the vertical placement of the two pieces of the cymbal will produce the so-called 4 M331676 96-12-10 embossing effect (MoiMEffect), which seriously affects the display of the liquid crystal display panel. Like quality. That is, the structure of the above-mentioned cymbal sheet and its stacking manner may cause the backlight module to effectively provide a uniform surface light source, resulting in a decrease in the display quality of the liquid crystal display panel. On the other hand, since the surface of the cymbal 1 is a zigzag structure, the sawtooth structure affects the optical effect of the backlight module, so that the light L is emitted from the stacked cymbal 100 and concentrated on the front view area of the liquid crystal display panel. As a result, the user does not easily see the screen displayed by the liquid crystal display panel from the side view area of the liquid crystal display panel, that is, the viewing angle of the user is narrow. In summary, the conventional cymbal 1 has a need for improvement. [New Content] This creation provides an optical film with a large viewing angle. The present application proposes an optical film comprising a light transmissive substrate and a plurality of first prisms disposed on the light transmissive substrate. Each of the first prisms has a first convex curved surface and a first concave curved surface, wherein the first convex curved surface is joined to the inner concave curved surface to form a first top end. In an embodiment of the present invention, the manner of intersection of each of the first cymbals and the adjacent one of the first cymbals includes two first convex curved surfaces, two first concave curved surfaces, and one first outer The convex curved surface intersects with a first concave curved surface. In one embodiment of the present invention, the first convex curved surface and the first concave curved surface have a radius of curvature greater than or equal to 31.2 μΙη. In one embodiment of the present invention, the distance between each of the first tips and the light transmissive substrate 5 M331676 96-12-10 is a first predetermined distance, and the first predetermined distance is between ΙΟμπι 4040 μm. In an embodiment of the present invention, the optical cymbal further includes a plurality of second prisms, each of the second cymbals having a second convex curved surface and a second concave curved surface.
在本創作之一實施例中，每一個第二稜鏡與相鄰之第 一稜鏡的交接方式包括一個第二外凸曲面與一個第一外凸 曲面^接、一個第二外凸曲面與一個第一内凹曲面交接、 一個第二内凹曲面與一個第一外凸曲面交接以及一個第二 内凹曲面與—個第一内凹曲面交接。 在，創作之一實施例中，每一個第二稜鏡之第二外凸 曲面與第二内凹曲面相接形成—第二頂端， 另一最近H端的距離小於·_。 在本創作之一實施例中，第二外凸曲面以及第二内凹 曲面之曲率半徑大於或等於 31·2μιη 〇In an embodiment of the present invention, the manner in which each of the second turns intersects with the adjacent first one includes a second convex curved surface and a first convex curved surface, and a second convex curved surface. A first concave curved surface intersection, a second concave curved surface intersecting with a first convex curved surface, and a second concave curved surface intersecting the first first concave curved surface. In one embodiment of the creation, the second convex curved surface of each of the second turns is joined to the second concave curved surface to form a second top end, and the distance of the other nearest H end is less than ·_. In an embodiment of the present invention, the radius of curvature of the second convex curved surface and the second concave curved surface is greater than or equal to 31·2 μιη 〇
之間ίΐίί之Γ實施例中’每—個第二頂端與透光基材 為—弟二預疋距離，每一個第一頂端與透光基 一預定距^離為—第―預定轉，而第^預定距離大於第 距離之—實施财’第二預歧敎於第一預定 鏡，上述，本創作是在透光基材上配置多個第一稜 曲面ΓΓ第—稜鏡具有—第—外凸曲面以及—第一内凹 /、，由於本創作之第一稜鏡是由一第一外凸曲面 6 M331676 96-12-10 以及一第一内凹曲面所組成之稜鏡結構，由於第一外凸曲 面以及第一内凹曲面可均勻地將光線散射出，因此光線穿 過本創作之光學膜片後，光線會均勻地朝向液晶顯示面板 之前視區域以及側視區域出射，而使用者無論在液晶顯示 面板之前視區域或是側視區域均可清楚地觀看到液晶顯示 面板所顯示之晝面，亦即有較大的視角。 為讓本創作之上述特徵和優點能更明顯易懂，下文特 舉車父么貝施例，並配合所附圖式，作詳細說明如下。 【實施方式】 圖2是本創作之第一實施例光學膜片之示意圖。請參 考圖2，本創作之光學膜片200包括一透光基材210以及 多個彼此相鄰排列配置於透光基材210上之第一稜鏡 220。其中，在本實施例中，每一個第一稜鏡220具有一第 一外凸曲面222以及一第一内凹曲面224，第一外凸曲面 222與第一内凹曲面224相接以形成一第一頂端226,且每 一個第一棱鏡220與其相鄰之第一棱鏡220相接以形成一 第一底端228。 Ο 以圖2所示之光學膜片200來做說明，本實施例之多 個第一稜鏡220例如是以兩個為一組的排列方式配置於透 光基材210上，由左至右連續排列了六個結構相同且彼此 相鄰之第一稜鏡 220a、220b、220c、220d、220e 以及 220f， 為求簡明該圖式僅標示最右侧之第一稜鏡220f以及其所 屬隻第一外凸曲面222與第一内凹曲面224，特此說明 7 M331676 96-12-10 值得注意的是，本實施例中四個第一稜鏡220a、220b、220e 以及220f的第一外凸曲面222位於左側而第一内凹曲面 224位於右側的配置，另一方面，另外二個第一稜鏡220c 以及220d則為相反的配置，亦即第一外凸曲面222位於右 側而第一内凹曲面224位於左侧。當然，本創作在此對這 些第一稜鏡220排列於透光基材210上之方式並不做任何 限制，凡於透光基材210上配設同時具有上述第一外凸曲 面222以及第一内凹曲面224之第一棱鏡220均屬本創作 之精神與範脅。 在本實施例中，第一外凸曲面222之曲率半徑ri例 如是與第一内凹曲面224之曲率半徑R2相同，第一外凸 曲面222之曲率半徑R1以及第一内凹曲面224之曲率半 控R2例如是大於或等於31·2μιη。此外，每一個第一頂端 226與透光基材210之間的距離為一第一預定距離di，在 上述第一外凸曲面222與第一内凹曲面224相交於第一頂 端226以及曲率半徑R1與R2相同的條件下，可以預見兩 參 相鄰之第一底端228間的距離例如為第一預定距離D1的 兩倍，其中第一預定距離D1例如是介於1〇μιη〜4〇μιη之 間。另外，使用者可依據實際上之使用需求來調整第一外 凸曲面222之曲率半徑R1、第一内凹曲面224之曲率半徑 R2或是第一預定距離D1，以使得光線穿過本創作之光學 膜片200後，光線能有較大的出射角度變化，如此一來: 使用者無論在液晶顯示面板之前視區域或是側視區域均可 清楚地觀看到液晶顯示面板所顯示之晝面，亦即，使用者 8 M331676 96-12-10 視覺上能有較大的視角。 另一方面，入射光線亦可均勻地自本創作之光學膜片 200出射，因為第一外凸曲面222與第一内凹曲面224聚 光度不同造成的亮度差異，以及上述第一稜鏡220配置方 向的變化造成的不規則明紋、暗紋，再加上藉由上、下層 紋路垂直擺放之二個光學膜片（圖中未示）等條件共同作 用下，進而有效地改善叠紋效應。 圖3是本創作之第二實施例光學膜片之示意圖。請參 考圖3，本實施例之光學膜片300與上述第一實施例之光 學膜片200相似，唯二者主要差異在於本實施例之光學膜 片300更包括多個弟二棱鏡230，其中這些第二棱鏡230 與多個第一稜鏡220交錯配置於透光基材21〇上。與第一 稜鏡220相同，每一個第二稜鏡230亦具有一第二外凸曲 面232以及一第二内凹曲面234，而第二外凸曲面232與 第二内凹曲面234相接以形成一第二頂端236，且每一個 第一稜鏡230與其相鄰之第一稜鏡220相接以形成一第二 底端238。 喷繼續參考圖3，本實施例之每一個第二棱鏡230的 第二外凸曲面232與相鄰之第一稜鏡220之第一外凸曲面 222相接，且每一個第二棱鏡23〇之第二内凹曲面234^ 相鄰之第一稜鏡220之第一内凹曲面224相接。然而/、 據上述第一實施例，第二棱鏡230亦可有不同的酉、己：： 中未示），例如第二稜鏡230與第—稜鏡22〇盥 二 22〇交接的方式還包括第二稜鏡23G之第二^ = M331676 96-12-10 與弟-稜鏡220之第-内凹曲面224交接，或第二棱鏡別 =第二内凹曲面234與第-稜鏡220之第-外凸曲面224 父接，此亦應包含在本創作之範圍内。在本實施例中 一個第二頂端236與透光基材21〇之間的距離例如為一第 二預定距離D2，第二職轉D2例如大於第—預定距離 以1〜1〇μΠ1，亦即第二稜鏡230高出第一稜鏡22〇 1〜_m，此實施方式使得多個光學膜片上下貼附時 φ (圖中未示），上下層的光學膜片300可被第二稜鏡23〇 隔開一段距離，進而改善不良貼提高光學效果。 —另外，為能使光學膜片300有較佳之光學性質，在本 貫施例中，第二外凸曲面232之曲率半徑R3以及第二内 凹曲面234之曲率半徑R4相同，第二外凸曲面232之曲 率半徑R3以及第二内凹曲面234之曲率半徑R4例如是大 於或等於31·2μπι，且任一第二頂端236與其最近之另一第 二頂端236間的距離例如是小於2〇〇μπι。同理，第二外凸 曲面232與第二内凹曲面234相交於第二頂端236以及曲 • 率半徑R3與R4相同的條件下，亦可以預見而兩相鄰之第 二底端238間的距離例如是第二預定距離D2的兩倍。 圖4是本創作之第三實施例光學膜片之示意圖。請參 考圖4，本實施例之光學膜片400與上述第二實施例之光 學膜片300相似，唯一者主要差異在於第二實施例之第一 稜鏡220與第二稜鏡230於透光基材21〇上配置的數量比 例為1 : 1，而本實施例之第一稜鏡220與第二稜鏡230於 透光基材210上配置的數量比例為2 : 1。 M331676 96-12-10 值得注意的是，本創作對於第二實施例以及第三實施 例中之第二稜鏡320排列於透光基材21〇上之方式亦不做 任何限制，凡於透光基材21〇上配置同時具有上述第二外 凸曲面232以及第二内凹曲面234之第二稜鏡23〇均屬本 創作之精神與範疇。另一方面，上述各稜鏡的結構參數例 如Dl、D2、ΪΠ、R2、R3、R4以及等最近二個第二頂端 236之間距等條件是可於製造過程中加以控制的，故上述 ⑩ 第一稜鏡220與第二稜鏡230於透光基材210上配置的數 量比例是幾何上的必然，故本創作不須刻意定義該數量比 例。 綜上所述，在本創作之光學膜片中，每一個稜鏡上設 有一外凸曲面以及一内凹曲面，而光線在入射光學膜片之 後 了猎由外凸曲面以及内凹曲面以均勻地自光學膜片出 射。相較於習知技術，本創作之光學膜片可減緩疊紋效應 的影響，進而使背光模組能產生均勻的出射面光源。 此外’本創作稜鏡之外凸曲面以及内凹曲面可多向性 • 肖^地將光線散射出去，因此使用者無論在液晶顯示面板 之前視區域或是側視區域均可清楚地觀看到液晶顯示面板 戶^顯示之晝面。亦即，本創作之光學膜片能有效地提升液 晶顯示面板的視角。 雖然本創作已以較佳實施例揭露如上，然其並非用以 限，本創作’任何所屬技術領域中具有通常知識者，在不 脫離本創作之精神和範圍内，當可作些許之更動與潤飾， 此本創作之保遵範圍當視後附之申請專利範圍所界定者 11 96-12-10 M331676 為準。 【圖式簡單說明】 圖1是習知之稜鏡片交互堆疊之示意圖。 圖2是本創作之第一實施例光學膜片之示意圖。 圖3是本創作之第二實施例光學膜片之示意圖。 圖4是本創作之第三實施例光學膜片之示意圖。 【主要元件符號說明】 100 z棱鏡片 200、300、400 :光學膜片 210 :透光基材 220、220a、220b、220c、220d、220e、220f :第一稜 鏡 222 :第一外凸曲面 224 :第一内凹曲面 226 :第一頂端 225 ··第一底端 230 :第二棱鏡 232 :第二外凸曲面 234 :第二内凹曲面 236 :第二頂端 238 :第二底端 L :光線 12 96-12-10 M331676 D1 :第一預定距離 D2 :第二預定距離 ία、R2、R3、R4 ··曲率半徑 _ 13Between the two examples, each of the second top ends and the light-transmitting substrate are the first two, and each of the first top ends is separated from the light-transmitting substrate by a predetermined distance. The second predetermined distance is greater than the first distance—the implementation of the second pre-discrimination on the first predetermined mirror. The above-mentioned creation is to arrange a plurality of first curved surfaces on the light-transmitting substrate. The convex curved surface and the first concave /, since the first flaw of the creation is a 稜鏡 structure composed of a first convex curved surface 6 M331676 96-12-10 and a first concave curved surface, The first convex curved surface and the first concave curved surface can uniformly scatter the light, so that the light passes through the optical film of the present invention, and the light uniformly emits toward the front view area and the side view area of the liquid crystal display panel, and is used. The front view or the side view area of the liquid crystal display panel can clearly see the face displayed by the liquid crystal display panel, that is, a larger viewing angle. In order to make the above-mentioned features and advantages of the present creation more obvious and easy to understand, the following is a detailed description of the vehicle parent and the accompanying drawings. Embodiments Fig. 2 is a schematic view showing an optical film of a first embodiment of the present invention. Referring to FIG. 2, the optical film 200 of the present invention includes a light transmissive substrate 210 and a plurality of first crucibles 220 arranged adjacent to each other on the light transmissive substrate 210. In this embodiment, each of the first turns 220 has a first convex curved surface 222 and a first concave curved surface 224. The first convex curved surface 222 is connected to the first concave curved surface 224 to form a first concave curved surface 224. The first top end 226, and each of the first prisms 220 is in contact with the adjacent first prism 220 to form a first bottom end 228. The optical film 200 shown in FIG. 2 is used for description. The plurality of first turns 220 of the embodiment are disposed on the light-transmitting substrate 210, for example, in a two-group arrangement, from left to right. The first 稜鏡 220a, 220b, 220c, 220d, 220e, and 220f having the same structure and adjacent to each other are successively arranged, and for the sake of simplicity, only the rightmost first 稜鏡 220f and its associated only A convex curved surface 222 and a first concave curved surface 224, hereby explained that 7 M331676 96-12-10 is notable, in this embodiment, the first convex curved surfaces of the four first turns 220a, 220b, 220e and 220f in this embodiment 222 is located on the left side and the first concave curved surface 224 is located on the right side. On the other hand, the other two first turns 220c and 220d are in opposite configurations, that is, the first convex curved surface 222 is located on the right side and the first concave surface Surface 224 is on the left side. Of course, the present invention does not impose any limitation on the manner in which the first crucibles 220 are arranged on the transparent substrate 210. The first transparent curved surface 222 and the first surface are disposed on the transparent substrate 210. The first prism 220 of a concave curved surface 224 belongs to the spirit and scope of the present creation. In the present embodiment, the radius of curvature ri of the first convex curved surface 222 is, for example, the same as the radius of curvature R2 of the first concave curved surface 224, and the curvature radius R1 of the first convex curved surface 222 and the curvature of the first concave curved surface 224. The half control R2 is, for example, greater than or equal to 31·2 μηη. In addition, the distance between each of the first top end 226 and the transparent substrate 210 is a first predetermined distance di, and the first convex curved surface 222 intersects the first concave curved surface 224 at the first top end 226 and the radius of curvature Under the same conditions of R1 and R2, it can be foreseen that the distance between the adjacent first bottom ends 228 of the two parameters is, for example, twice the first predetermined distance D1, wherein the first predetermined distance D1 is, for example, between 1〇μιη and 4〇. Between μιη. In addition, the user can adjust the radius of curvature R1 of the first convex curved surface 222, the radius of curvature R2 of the first concave curved surface 224, or the first predetermined distance D1 according to the actual use requirement, so that the light passes through the creation. After the optical film 200, the light can have a large change in the angle of the exit, so that the user can clearly see the face displayed by the liquid crystal display panel in the front view area or the side view area of the liquid crystal display panel. That is, the user 8 M331676 96-12-10 can visually have a larger viewing angle. On the other hand, the incident light can also be uniformly emitted from the optical film 200 of the present invention, because the difference in brightness between the first convex curved surface 222 and the first concave curved surface 224 is different, and the first first 220 configuration The irregular lines and dark lines caused by the change of direction, together with the two optical films (not shown) placed vertically by the upper and lower layers, effectively improve the moiré effect. . Figure 3 is a schematic illustration of an optical film of a second embodiment of the present invention. Referring to FIG. 3, the optical film 300 of the present embodiment is similar to the optical film 200 of the first embodiment, but the main difference is that the optical film 300 of the embodiment further includes a plurality of prisms 230, wherein The second prisms 230 are alternately disposed on the light-transmitting substrate 21A with the plurality of first turns 220. Similar to the first crucible 220, each second crucible 230 also has a second convex curved surface 232 and a second concave curved surface 234, and the second convex curved surface 232 is connected to the second concave curved surface 234. A second top end 236 is formed, and each of the first turns 230 is in contact with its adjacent first turn 220 to form a second bottom end 238. Continuing with reference to FIG. 3, the second convex curved surface 232 of each of the second prisms 230 of the present embodiment is in contact with the first convex curved surface 222 of the adjacent first cymbal 220, and each of the second prisms 23 〇 The second concave curved surface 234 is adjacent to the first concave curved surface 224 of the adjacent first turn 220. However, according to the first embodiment described above, the second prism 230 may have different 酉, ::: not shown), for example, the second 稜鏡 230 and the first 稜鏡 22 〇盥 22 22 〇 The second ^=M331676 96-12-10 including the second 稜鏡23G is intersected with the first-concave curved surface 224 of the 稜鏡-稜鏡220, or the second prism =the second concave curved surface 234 and the first 稜鏡220 The first-convex surface 224 is the parent, and this should also be included in the scope of this creation. In this embodiment, the distance between a second top end 236 and the light-transmitting substrate 21A is, for example, a second predetermined distance D2, and the second job rotation D2 is, for example, greater than the first predetermined distance by 1 to 1 〇μΠ1, that is, The second crucible 230 is higher than the first crucible 22〇1 to _m. This embodiment allows a plurality of optical films to be attached to the upper and lower sides φ (not shown), and the upper and lower optical films 300 can be second ribbed. The mirrors 23 are separated by a distance, thereby improving the bad stickers and improving the optical effect. In addition, in order to enable the optical film 300 to have better optical properties, in the present embodiment, the radius of curvature R3 of the second convex curved surface 232 and the radius of curvature R4 of the second concave curved surface 234 are the same, and the second convex The radius of curvature R3 of the curved surface 232 and the radius of curvature R4 of the second concave curved surface 234 are, for example, greater than or equal to 31·2 μm, and the distance between any second top end 236 and the other second top end 236 thereof is, for example, less than 2〇. 〇μπι. Similarly, when the second convex curved surface 232 and the second concave curved surface 234 intersect the second top end 236 and the curvature radius R3 and R4 are the same, it is also foreseen between the two adjacent second bottom ends 238. The distance is, for example, twice the second predetermined distance D2. Figure 4 is a schematic illustration of an optical film of a third embodiment of the present invention. Referring to FIG. 4, the optical film 400 of the present embodiment is similar to the optical film 300 of the second embodiment described above. The only difference is that the first 稜鏡 220 and the second 稜鏡 230 of the second embodiment are transparent. The ratio of the number of the first substrate 220 and the second layer 230 disposed on the transparent substrate 210 is 2:1. M331676 96-12-10 It should be noted that the present invention does not impose any restrictions on the manner in which the second 稜鏡320 in the second embodiment and the third embodiment are arranged on the transparent substrate 21〇. The second substrate 23 having the second convex curved surface 232 and the second concave curved surface 234 disposed on the light substrate 21 is the spirit and scope of the present invention. On the other hand, the structural parameters such as D1, D2, ΪΠ, R2, R3, R4 and the like of the distance between the last two second tips 236 can be controlled during the manufacturing process, so the above 10 The ratio of the number of the second 220 to the second crucible 230 disposed on the light-transmissive substrate 210 is geometrically inevitable, so the creation does not need to deliberately define the quantitative ratio. In summary, in the optical film of the present invention, each of the cymbals is provided with a convex curved surface and a concave curved surface, and the light is hunted by the convex curved surface and the concave curved surface after the incident optical film. The ground is emitted from the optical film. Compared with the prior art, the optical film of the present invention can mitigate the influence of the moiré effect, thereby enabling the backlight module to generate a uniform exit surface light source. In addition, the original convex surface and the concave curved surface can be omnidirectional. The light is scattered out, so that the user can clearly see the liquid crystal in the front view area or the side view area of the liquid crystal display panel. The panel is displayed after the panel is displayed. That is, the optical film of the present invention can effectively enhance the viewing angle of the liquid crystal display panel. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to be limiting, and the present invention may be modified by any person skilled in the art without departing from the spirit and scope of the present invention. Retouching, the scope of this creation is subject to the definition of the patent application scope of the following 11 96-12-10 M331676. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a conventional stacking of cymbals. Figure 2 is a schematic illustration of an optical film of a first embodiment of the present invention. Figure 3 is a schematic illustration of an optical film of a second embodiment of the present invention. Figure 4 is a schematic illustration of an optical film of a third embodiment of the present invention. [Main component symbol description] 100 z prism sheet 200, 300, 400: optical film 210: light-transmitting substrate 220, 220a, 220b, 220c, 220d, 220e, 220f: first 稜鏡 222: first convex curved surface 224: first concave curved surface 226: first top end 225 · first bottom end 230: second prism 232: second convex curved surface 234: second concave curved surface 236: second top end 238: second bottom end L : Light 12 96-12-10 M331676 D1 : First predetermined distance D2 : Second predetermined distance ία, R2, R3, R4 · Curvature radius _ 13