M280484 八、新型說明： 【新型所屬之技術領域】 本創作係有關一種光學膜片，4寺別是有關於一種在單一膜 片上具有集光結構與擴散結構’並利用兩者之高度差異以 ^ 保護集光結構免於刮傷之防刮型光學膜片。 【先前技術】 目前背光模組中所使用的增亮膜片（brightness enhanced film，BEF)，主要為大量的微稜鏡結構所構成， 習知光學膜片利用微稜鏡結構對於入射光之不同角度及方 向的收斂特性，可以將經過擴散後的光線集中至適當的視 角範圍之中，進而提高光線的有效使用率，但微稜鏡結構 在模組組裝時容易造成刮冑，因此需要外加一上擴散片來 保護並加強光的擴散度，如此勢必要提高模組組裝時的復 雜度。 在美國專利號瑪5919551此案中，提出-種具有稜鏡 結構^光學膜片，如圖一所示，此光學膜片1〇雖然具有集 光功此，但並無擴散功能，在模組組裝時容易與其他組件 或面板相互碰觸’造成尖角12發生刮傷或損毁之情況。 在美國專利號碼6724535此案中，提出—種利用多段 鏡結構，其係搭配折射率梯度變化之材料以達成 缸之目的，如圖二所示，然而此光學膜片20之多段 變程ΪΪ困難度相當高，而且折射率梯度 Η成本頗為昂貴，使得此多段斜率結構的可行性 5 M280484 不高，同樣地，在尖角22的部分仍然容易於模組組裝時受 損。 在習知技術中，並未揭示任何可同時解決上述問題的 手段。有鑑於此，本創作提出一種防刮型光學膜片，其係 利用微結構在幾何尺寸上的設計調整，使得光學膜片不僅 同時具有集光功能與擴散功能，更能保護集光結構免於刮 傷，且製作容易。 【新型内容】 本創作的主要目的是提供一種防刮型光學膜片，透過 微結構的設計與佈局，保護光學膜片上之集光結構免於刮 傷。 本創作的次要目的是使用單一膜片以同時具備有集光 功能與擴散功能之複合特性。 為達到上述目的，本創作提出一種防刮型光學膜片， 包括一基板、一集光部以及一擴散部。該基板具有一可接 收一入射光之第一光學表面及一可出射該入射光之第二光 學表面；該集光部係形成於該第二光學表面上，包括至少 一用以集中該入射光之集光結構；該擴散部係形成於該第 二光學表面上，包括至少一用以擴散該入射光之擴散結 構，其中該擴散部頂端至該第二光學表面之第一垂直高度 大於該集光部頂端至該第二光學表面之第二垂直高度。 較佳地，該擴散結構係與該集光結構交錯排列。 較佳地，任兩相鄰之該擴散結構與該集光結構之間， 另設置有一個或一個以上之該擴散結構或該集光結構。 M280484 較佳地，該擴散結構為一條狀結構。 β 較佳地，該擴散結構之橫向截面形狀係呈一圓弧狀。 • 較佳地，該擴散結構之橫向截面形狀係呈一拋物線狀。 . 較佳地，該擴散結構之橫向截面形狀係呈一波浪狀。 、 較佳地，該擴散結構之頂端至該第二光學表面的每個 垂直高度小於或等於該第一垂直高度。 較佳地，該集光結構為一條狀結構。 0 較佳地，該集光結構之橫向截面形狀係為一三角形。 較佳地，該三角形之頂角角度介於30度至120度間。 較佳地，該三角形之頂角角度最佳值為90度。 較佳地，該集光結構之頂端至該第二光學表面的每個 垂直高度小於或等於該第二垂直高度。 較佳地，該基板與該擴散部係為一體成形者。 較佳地，該基板與該集光部係為一體成形者。 較佳地，該第一光學表面係為一平滑光學表面。 • 較佳地，該第一光學表面係為一粗糙光學表面。 較佳地，該粗糖光學表面上係塗佈有一膜層，該膜層 具有BaS之微粒子。 較佳地，該粗链光學表面上係塗佈有一膜層，該膜層 • 具有Ti02之微粒子。 較佳地，該第一垂直高度大於該第二垂直高度。 較佳地，該第一垂直高度與該第二垂直高度之差值介 於l//m至10//m之間。 M280484 綜上所述，本創作提出一種防刮型光學膜片，其係利 用集光結構與擴散結構在幾何尺寸上的設計調整，透過兩 者之高度差異以保護集光結構免於刮傷，此光學膜片不僅 具有增亮效果，更具有柔和視角亮度變化的效果。本創作 防刮型光學膜片同時整合擴散、集光、防刮保護之功能。 【實施方式】 為使貴審查委員能對本創作之特徵、目的及功能有 更進一步的認知與瞭解，茲配合圖式詳細說明如後： 請參考圖三A，本創作防刮型光學膜片之集光結構30 具有良好的集光特性，其係能夠縮小入射光線的發散角 度，根據司乃爾定律（Snel Γ s Law)，當入射光32射入集 光結構30後，如果角度Θ大於全反射臨界角，則入射光 32會在集光結構30内發生全反射（如圖三A中虛線箭頭）， 反之如果角度Θ小於全反射臨界角，則入射光32在離開 集光結構30後（如圖三A中實線箭頭）會再次偏離法線（如 圖三A中虛線），故可達到集光效果。 請參考圖三B，本創作防刮型光學膜片之擴散結構34 具有良好的規範擴光特性，其係具有透鏡的像差效果，可 對入射光線產生模糊化、均勻化之效果，當入射光36a、 當離軸之入射光36b、入射光36c以及入射光36d射入擴 散結構34後，會先匯聚於匯聚區38然後再發散，利用此 特性可達成大入射角度光線的出光角有效收斂同時並不破 壞其擴散性之目的。 請參考圖四，圖四為本創作防刮型光學膜片之第一較 8 M280484 佳實施例，該光學膜片包括一基板40、一集光部42以及 一擴散部44。該基板40具有一可接收一入射光之第一光 學表面402及一可出射該入射光之第二光學表面404 ;該 集光部42係形成於該第二光學表面404上，其係由多個可 用以集中該入射光之集光結構425所構成；該擴散部44係 形成於該第二光學表面404上，其係由多個可用以擴散該 入射光之擴散結構445所構成，其中該集光結構425係與 該擴散結構445交錯排列。該擴散部44之頂端至該第二光 學表面404之第一垂直高度Η(即為該擴散部之最大高度） 大於該集光部44之頂端至該第二光學表面404之第二垂直 高度h(即為該集光部之最大高度）。在本實施例中，該集 光結構425與該擴散結構445皆為條狀結構，該集光結構 425之橫向截面形狀為一三角形，其頂角角度皆為90度， 該擴散結構445之橫向截面形狀係呈一圓弧狀。 請參考圖五，圖五為本創作防刮型光學膜片之第二較 佳實施例，該光學膜片包括一基板50、一集光部52以及 一擴散部54。該基板50具有一可接收一入射光之第一光 學表面502及一可出射該入射光之第二光學表面504 ;該 集光部52係形成於該第二光學表面504上，其係由多個可 用以集中該入射光之集光結構525所構成；該擴散部54係 形成於該第二光學表面504上，其係由多個可用以擴散該 入射光之擴散結構545所構成，其中該集光結構525係與 該擴散結構545交錯排列。該擴散部54之頂端至該第二光 學表面504之第一垂直高度Η(即為該擴散部之最大高度） 大於該集光部54之頂端至該第二光學表面504之第二垂直 9 M280484 高度h(即為該集光部之最大高度）。在 構545皆為條狀結構，該集光G :25之杈向截面純為一三角形，其頂角角度皆為9〇度， 忒擴散結構545之橫向截面形狀係呈一波浪狀。 然而本創作防刮型光學膜片之集光結構，其頂角角度 可介於30度至120度間，每個集光結構的頂角角度 全相同，其垂直高度不須完全相同，其盥基 'M280484 8. Description of the new type: [Technical field to which the new type belongs] This creation relates to an optical film, and 4 Si is related to a type of light-collecting structure and diffuse structure on a single film ', and the difference between the two is used to ^ Scratch-resistant optical film that protects the light-collecting structure from scratches. [Previous technology] Brightness enhanced film (BEF) currently used in backlight modules is mainly composed of a large number of micro-chirped structures. It is known that optical films use micro-chirped structures to differentiate the incident light. The convergence characteristics of angle and direction can concentrate the diffused light into the proper viewing angle range, thereby improving the effective use of light. However, the micro-chirped structure is easy to cause scratches when the module is assembled, so it is necessary to add a A diffuser is placed on top to protect and enhance the degree of light diffusion. This will inevitably increase the complexity of module assembly. In the case of U.S. Patent No. 5919551, a kind of optical film with a 稜鏡 structure is proposed, as shown in Figure 1. Although this optical film 10 has the function of collecting light, it does not have a diffusion function. It is easy to touch with other components or panels during assembly, which may cause scratches or damage to the sharp corners 12. In the case of U.S. Patent No. 6,724,535, a kind of multi-segment mirror structure is proposed, which is matched with a refractive index gradient material to achieve the purpose of the cylinder, as shown in Figure 2. However, the multi-segment range of this optical diaphragm 20 is difficult The degree of refraction is relatively high, and the cost of the refractive index gradient Η is quite expensive, making the feasibility of this multi-slope structure 5 M280484 not high. Similarly, the sharp corner 22 is still easily damaged during module assembly. In the conventional technology, no means for solving the above problems is disclosed. In view of this, this creation proposes a scratch-resistant optical film, which uses the design and adjustment of the geometric structure of the microstructure, so that the optical film not only has the light collection function and the diffusion function, but also protects the light collection structure from the Scratched and easy to make. [New content] The main purpose of this creation is to provide a scratch-resistant optical film. Through the design and layout of the microstructure, the light collecting structure on the optical film is protected from scratches. The secondary purpose of this creation is to use a single diaphragm to have the combined characteristics of both light collection and diffusion functions. In order to achieve the above object, the present invention proposes a scratch-resistant optical film, which includes a substrate, a light collecting portion, and a diffusion portion. The substrate has a first optical surface capable of receiving an incident light and a second optical surface capable of emitting the incident light; the light collecting portion is formed on the second optical surface and includes at least one for concentrating the incident light A light collecting structure; the diffusion portion is formed on the second optical surface and includes at least one diffusion structure for diffusing the incident light, wherein a first vertical height from the top of the diffusion portion to the second optical surface is larger than the light collecting surface; The second vertical height from the top of the light portion to the second optical surface. Preferably, the diffusion structure is staggered with the light collecting structure. Preferably, one or more of the diffusion structure or the light-collecting structure is provided between any two adjacent ones of the diffusion structure and the light-collecting structure. M280484 Preferably, the diffusion structure is a strip structure. β Preferably, the lateral cross-sectional shape of the diffusion structure is an arc shape. • Preferably, the lateral cross-sectional shape of the diffusion structure is a parabola. Preferably, the lateral cross-sectional shape of the diffusion structure is a wave shape. Preferably, each vertical height from the top of the diffusion structure to the second optical surface is less than or equal to the first vertical height. Preferably, the light collecting structure is a strip structure. 0 Preferably, the cross-sectional shape of the light collecting structure is a triangle. Preferably, the apex angle of the triangle is between 30 degrees and 120 degrees. Preferably, the optimal value of the vertex angle of the triangle is 90 degrees. Preferably, each vertical height from the top of the light collecting structure to the second optical surface is less than or equal to the second vertical height. Preferably, the substrate and the diffusion portion are integrally formed. Preferably, the substrate and the light collecting portion are integrally formed. Preferably, the first optical surface is a smooth optical surface. • Preferably, the first optical surface is a rough optical surface. Preferably, a film layer is coated on the crude sugar optical surface, and the film layer has BaS fine particles. Preferably, a film layer is coated on the rough-chain optical surface, and the film layer has fine particles of Ti02. Preferably, the first vertical height is greater than the second vertical height. Preferably, the difference between the first vertical height and the second vertical height is between 1 // m and 10 // m. M280484 In summary, this creation proposes a scratch-resistant optical film, which uses the design adjustment of the light collection structure and the diffusion structure on the geometric size, and protects the light collection structure from scratches through the difference in height between the two. This optical film not only has a brightening effect, but also has the effect of softening the brightness change of the viewing angle. This creation Anti-scratch optical film integrates the functions of diffusion, light collection and anti-scratch protection at the same time. [Implementation] In order for your review committee to have a better understanding and understanding of the characteristics, purpose and function of this creation, we will explain it in detail with the drawings as follows: Please refer to Figure 3A, the scratch-resistant optical film of this creation The light collection structure 30 has good light collection characteristics, which can reduce the divergence angle of the incident light. According to Snel's Law (Snel Γ s Law), after the incident light 32 enters the light collection structure 30, if the angle θ is greater than the total reflection Critical angle, the incident light 32 will be totally reflected in the light collecting structure 30 (as shown by the dashed arrow in FIG. 3A), if the angle Θ is less than the critical angle of total reflection, the incident light 32 leaves the light collecting structure 30 (such as The solid line arrow in Figure 3A) will deviate from the normal line again (as shown by the dashed line in Figure 3A), so the light collection effect can be achieved. Please refer to FIG. 3B. The diffusion structure 34 of this creative scratch-resistant optical film has good standard light expansion characteristics. It has the lens aberration effect, which can blur and homogenize the incident light. Light 36a, when the off-axis incident light 36b, incident light 36c, and incident light 36d enter the diffuser structure 34, they will first converge in the convergence area 38 and then diverge. This feature can be used to achieve effective convergence of the light exit angle of a large incident angle light At the same time it does not undermine its purpose of proliferation. Please refer to FIG. 4. FIG. 4 is a first preferred embodiment of the scratch-resistant optical film M280484. The optical film includes a substrate 40, a light collecting portion 42, and a diffusion portion 44. The substrate 40 has a first optical surface 402 capable of receiving an incident light and a second optical surface 404 capable of emitting the incident light; the light collecting portion 42 is formed on the second optical surface 404, A light-collecting structure 425 that can be used to concentrate the incident light; the diffusion portion 44 is formed on the second optical surface 404 and is composed of a plurality of diffusion structures 445 that can be used to diffuse the incident light, wherein the The light collection structure 425 is staggered with the diffusion structure 445. The first vertical height Η from the top of the diffusion portion 44 to the second optical surface 404 (that is, the maximum height of the diffusion portion) is greater than the second vertical height h from the top of the light collection portion 44 to the second optical surface 404 (That is, the maximum height of the light collecting part). In this embodiment, the light-concentrating structure 425 and the diffusion structure 445 are both strip-shaped structures. The lateral cross-sectional shape of the light-concentrating structure 425 is a triangle, and the apex angles thereof are 90 degrees. The cross-sectional shape is an arc. Please refer to FIG. 5. FIG. 5 is a second preferred embodiment of the scratch-resistant optical film. The optical film includes a substrate 50, a light collecting portion 52, and a diffusion portion 54. The substrate 50 has a first optical surface 502 capable of receiving an incident light and a second optical surface 504 capable of emitting the incident light; the light collecting portion 52 is formed on the second optical surface 504, which is composed of A light-collecting structure 525 that can be used to concentrate the incident light; the diffusion portion 54 is formed on the second optical surface 504 and is composed of a plurality of diffusion structures 545 that can be used to diffuse the incident light, wherein the The light collection structure 525 is staggered with the diffusion structure 545. The first vertical height 顶端 from the top of the diffusing portion 54 to the second optical surface 504 (that is, the maximum height of the diffusing portion) is greater than the second vertical 9 from the top of the light collecting portion 54 to the second optical surface 504. M280484 Height h (that is, the maximum height of the light collecting part). The structure 545 is a strip-shaped structure, the cross section of the light collecting G: 25 is purely a triangle, and its apex angles are all 90 degrees. The transverse cross-sectional shape of the rhenium diffusion structure 545 is wavy. However, the light collection structure of this scratch-resistant optical film can have a vertex angle between 30 degrees and 120 degrees. The vertex angle of each light collection structure is the same. The vertical heights need not be exactly the same. Base ''
面積也不須完全相同；同樣地’每個擴散、i構的曲率半ί = :，其垂直高度不須完全相同，其與基板相接 觸的底面積也不須完全相同。惟每個集光結構之頂端至第 二光學表面的垂直高度須小於或等於第二垂直高度，每個 擴散結構之頂端至第二光學表面的垂直高度至少小於或等 於第-垂直高度，而第一垂直高度與第二垂直 卫介於1’至10_的範圍之間為最佳。此外任兩相鄰之擴 散結構與集光結構之間，亦可選擇設置有一個或一個以上 的擴散結構或集光結構。 "請茶考圖六，圖六為本創作防刮型光學膜片第三較佳 實，例的示意圖。基板6〇上之集光部62，其截面可為不 同高度、形狀（如正三角形、銳角三角形、鈍角三角形）、 排列順序之多個集光結構625所構成（本實施例使用多個 二角形形狀的集光結構），擴散部64的截面亦可為不同高 度^狀（如圓弧狀、拋物線狀、波浪狀）、排列順序之多 個擴散結構645所構成（本實施例使用多個不同高度之圓 弧狀的擴散結構）。該擴散部64的第一垂直高度Η (即為 該擴散部之最大高度）大於該集光部62的第二垂直高度 M280484 h(即為該集光部之最大高度）即可。 ^u月茶考圖七’圖七為本創作防刮型光學膜片第四較佳 實^例的不意圖。同樣地，基板70上之集光部72，其截 一為不同南度、幵>狀（如正三角形、銳角三角形、純角 了角形列順序之集光結構725所構成（本實施例使用 二個不同南度及不同形狀的集光結構），擴散部74的截面 ’、可為不同高度、形狀（如圓弧狀、拋物線狀、波浪狀）、 排列順序之擴散結構745所構成（本實施例使用 多個波浪 、及圓弧狀的擴散結構）。該擴散部74的第一垂直高度}} j即為及擴散部之最大高度）大於該集光部的第二垂直 南度h(即為該集光部之最大高度）即可。 …述=刮型光學膜片之實施例，透過集光部與擴散部 * 3 w度差異，在模組組裝時，可防止集光結構上的 〇角與另_膜片相互碰觸而受損。此外，光學膜片的基板 集光部為-體成形者，也可以是另—膜層，同樣地， 土反亦可與-擴散部為一體成形者，也可以是另一膜層， =第-光學表面可為一平滑光學表面，亦可為一粗經^學 ί^η請參考圖八A與圖八B’在一具有粗链光學表面之 上可另塗佈―膜層82 ’該膜層犯則具有Μ之微 粒子^⑽之難子，對於人射光有散射的功效。 、，、不口上述，本創作提出一種防刮型 用微結構在幾何尺寸上的設計娜膜片其係利 時具有集光功能與擴散功能更倉^^隼光^膜片不僅同 傷，且製作料。 料集光結構免於刮 唯以上所述者，僅為本創作之較佳實施例，當不能以 M280484 之限制本創作的範圍。即大凡依本創作申請專利範圍所做 之均等變化及修飾，仍將不失本創作之要義所在，亦不脫 離本創作之精神和範圍，故都應視為本創作的進一步實施 狀況。 【圖式簡單說明】 圖一為習知具有棱鏡結構之光學膜片的示意圖。 圖二為另一習知具有稜鏡結構之光學膜片的示意圖。The areas need not be exactly the same; likewise, the curvature of each diffusion structure, i ==, its vertical heights need not be exactly the same, and its bottom areas in contact with the substrate need not be exactly the same. However, the vertical height from the top of each light-collecting structure to the second optical surface must be less than or equal to the second vertical height, and the vertical height from the top of each diffusion structure to the second optical surface is at least less than or equal to the -vertical height, and the first It is best that a vertical height and a second vertical guard are in the range of 1 'to 10_. In addition, between any two adjacent diffusion structures and light-collecting structures, one or more diffusion structures or light-collecting structures can also be selected. " Please refer to Figure 6 for tea. Figure 6 is a schematic diagram of the third best example of creating a scratch-resistant optical film. The light collecting portion 62 on the substrate 60 may be formed by a plurality of light collecting structures 625 of different heights and shapes (such as a regular triangle, an acute triangle, an obtuse triangle), and an arrangement sequence. Shape of the light collecting structure), the cross section of the diffusion portion 64 can also be formed by a plurality of diffusion structures 645 of different heights (such as arc-shaped, parabolic, wavy), arranged in order (this embodiment uses a plurality of different Arc-shaped diffusion structure of height). The first vertical height Η of the diffusion portion 64 (that is, the maximum height of the diffusion portion) may be larger than the second vertical height M280484 h of the light collection portion 62 (that is, the maximum height of the light collection portion). Figure 7 of the Moon Tea Test Figure 7 is the intention of creating the fourth preferred example of a scratch-resistant optical film. Similarly, the light-concentrating part 72 on the substrate 70 is formed by a light-concentrating structure 725 of different south degrees, 幵 > shapes (such as a regular triangle, an acute-angled triangle, and a purely angled angular sequence) (used in this embodiment) Two light-collecting structures with different south degrees and different shapes), the cross-section of the diffuser portion 74 may be composed of diffuser structures 745 of different heights and shapes (such as arc-shaped, parabolic, and wavy), and the order of arrangement (this The embodiment uses a plurality of waves and a circular arc-shaped diffusion structure). The first vertical height of the diffusion portion 74}} is the maximum height of the diffusion portion) is greater than the second vertical south degree h of the light collecting portion ( That is, the maximum height of the light collecting part). … Described = an example of a scratch-type optical film, through the difference between the light-collecting part and the diffuser part * 3 w, when the module is assembled, it can prevent the 0 angle on the light-collecting structure and the other film from touching each other. damage. In addition, the light-collecting portion of the substrate of the optical film is a body-former, or it may be another film layer. Similarly, the soil may also be formed integrally with the -diffusion portion, or it may be another film layer. -The optical surface can be a smooth optical surface or a rough warp. Please refer to Figures 8A and 8B 'on an optical surface with a thick chain can be additionally coated-film layer 82 Membrane criminals have the particles of M, and they have the effect of scattering human light. ,,, not to mention the above, this creation proposes a scratch-resistant microstructure in the geometric size of the design. The diaphragm has a light collection function and a diffusion function when it is beneficial. ^ ^ Light ^ not only the same injury, And making materials. The light collecting structure is free from scratches. The above is only a preferred embodiment of this creation, and the scope of this creation cannot be limited by M280484. That is to say, all equal changes and modifications made in accordance with the scope of the patent application for this creation will still not lose the essence of this creation, nor depart from the spirit and scope of this creation, so it should be regarded as the further implementation of this creation. [Schematic description] Figure 1 is a schematic diagram of a conventional optical film with a prism structure. FIG. 2 is a schematic diagram of another conventional optical film with a erbium structure.
圖三A為本創作之集光結構的光學特性示意圖。 圖三B為本創作之擴散結構的光學特性示意圖。 圖四為本創作防刮型光學膜片第一較佳實施例的示意圖。 圖五為本創作防刮型光學膜片第二較佳實施例的示意圖。 圖六為本創作防刮型光學膜片第三較佳實施例的示意圖。 圖七為本創作防刮型光學膜片第四較佳實施例的示意圖。 圖八A為本創作防刮型光學膜片有一粗糙光學表面之示意 圖。 圖八B為本創作防刮型光學膜片塗佈有一微粒子層的示意 圖0 【主要元件符號說明】 10、20〜光學膜片 12、22〜尖角 30〜集光結構 32、36a、36b、36c、36d〜入射光 M280484 34〜發散結構 38〜匯聚區 40、50、60、70、80〜基板 - 402、502〜第一光學表面 . 404、504〜第二光學表面 42、52、62、72〜集光部 425、525、625、725〜集光結構 I 44、54、64、74〜擴散部 445、545、645、745〜擴散結構 82〜膜層 Θ〜角度 Η〜第一垂直高度 h〜第二垂直高度Figure 3A is a schematic diagram of the optical characteristics of the light-collecting structure of the creation. Figure 3B is a schematic diagram of the optical characteristics of the diffusion structure of the creation. FIG. 4 is a schematic diagram of a first preferred embodiment of an anti-scratch optical film. FIG. 5 is a schematic diagram of a second preferred embodiment of an anti-scratch optical film. FIG. 6 is a schematic diagram of a third preferred embodiment of an anti-scratch optical film. FIG. 7 is a schematic diagram of a fourth preferred embodiment of the scratch-resistant optical film. Figure 8A is a schematic diagram of a rough optical surface of the scratch-resistant optical film of the creation. Fig. 8B is a schematic diagram of a scratch-resistant optical film coated with a fine particle layer. 0 [Description of main component symbols] 10, 20 ~ Optical film 12, 22 ~ Sharp angle 30 ~ Light collecting structure 32, 36a, 36b, 36c, 36d ~ incident light M280484 34 ~ divergent structure 38 ~ convergence area 40, 50, 60, 70, 80 ~ substrate-402, 502 ~ first optical surface. 404, 504 ~ second optical surface 42, 52, 62, 72 ~ light collecting section 425, 525, 625, 725 ~ light collecting structure I 44, 54, 64, 74 ~ diffusion section 445, 545, 645, 745 ~ diffusion structure 82 ~ film layer Θ ~ angle Η ~ first vertical height h ~ second vertical height
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