TWM597884U - Backlight module - Google Patents

Backlight module Download PDF

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TWM597884U
TWM597884U TW109201370U TW109201370U TWM597884U TW M597884 U TWM597884 U TW M597884U TW 109201370 U TW109201370 U TW 109201370U TW 109201370 U TW109201370 U TW 109201370U TW M597884 U TWM597884 U TW M597884U
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Taiwan
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light
backlight module
optical
optical film
guide plate
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TW109201370U
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Chinese (zh)
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楊舒評
李清祥
蘇方旋
陳家驊
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台灣揚昕股份有限公司
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Abstract

A backlight module including a light guide plate, a light source, an optical film, a first prism sheet and a second prism sheet is provided. The light guide plate has a light incident surface and a light exiting surface connected to each other. The light source is disposed on a side of the light incident surface of the light guide plate. The optical film includes a substrate, a plurality of optical microstructures and a first diffusion structure layer. The substrate has a light incident side and a light exiting side and the light incident side faces to the light guide plate. The optical microstructures are disposed on the light incident side. An extending direction of the optical microstructures intersects with the light incident surface. The first diffusion structure layer is disposed on the light exiting side and is overlapped with the optical microstructures. The first prism sheet and the second prism sheet are overlapped with the optical film and are positioned on the light exiting side. A first angle included between an extending direction of the optical microstructures and an extending direction of a plurality of prism structures of the first prism sheet is within the range of 85 degree to 95 degree. A second angle included between the extending direction of the prism structures of the first prism sheet and an extending direction of a plurality of prism structures of the second prism sheet is within the range of 85 degree to 95 degree.

Description

背光模組Backlight module

本新型創作是有關於一種光學模組,且特別是有關於一種背光模組。This new creation relates to an optical module, and particularly relates to a backlight module.

隨著液晶顯示器這類的非自發光顯示器的應用日益廣泛,背光模組的設計也需針對不同的使用情境而調整。為了提升光源的光能利用率,搭載光學增亮膜(Brightness Enhancement Film,BEF)的背光模組已成為市場的主流之一。一般來說,此類背光模組都配置有兩片光學增亮膜(例如稜鏡的延伸方向相互正交的兩稜鏡片)的疊層架構,可將導光板在大角度出射的光束導向涵蓋正視角的特定角度範圍內,以提高背光模組於正視角附近的整體出光強度。然而,這類雙層BEF的配置方式對於背光模組的薄型化有其限制。With the increasing application of non-self-luminous displays such as liquid crystal displays, the design of the backlight module also needs to be adjusted for different usage scenarios. In order to improve the light energy utilization rate of the light source, the backlight module equipped with Brightness Enhancement Film (BEF) has become one of the mainstreams in the market. Generally speaking, this kind of backlight module is equipped with a laminated structure of two optical brightness enhancement films (for example, the two optical films whose extending directions are orthogonal to each other), which can guide the light beam emitted from the light guide plate at a large angle to cover Within the specific angle range of the front viewing angle, the overall light intensity of the backlight module near the front viewing angle is improved. However, this type of double-layer BEF configuration has its limitations on the thinning of the backlight module.

為了提高背光模組的集光性並且突破上述薄型化的限制,一種採用逆稜鏡片來取代層疊的兩片光學增亮膜的集光型背光模組應運而生。這類背光模組能更進一步地提升在正視角附近的整體出光量(亦即,具有更小角度範圍的聚光特性)。另外,由於集光型背光模組所搭載的光學膜層的堆疊數量較少,使其整體厚度可有效縮減,有助於背光模組的薄化。然而,從另一觀點來說,使用此類集光型背光模組,當背光模組的各膜層之間存在細部缺陷或微小異物(例如組裝時所帶入的塵埃或毛屑)時,在後續品管的光學檢測過程中易被檢出。換句話說,此類集光性能極佳的背光模組對於細微缺陷的遮瑕性也較差,致使其整體的組裝良率下降。因此,如何兼顧背光模組的集光性與遮瑕性,是相關廠商在設計開發時所需面對的難題之一。In order to improve the light-collecting performance of the backlight module and break through the above-mentioned limitation of thinning, a light-collecting type backlight module that uses a reversed-layer sheet to replace two laminated optical brightness enhancement films has emerged. This type of backlight module can further increase the overall light output near the frontal viewing angle (that is, the light gathering characteristic with a smaller angle range). In addition, since the number of stacks of optical film layers mounted on the light-concentrating backlight module is small, its overall thickness can be effectively reduced, which contributes to thinning of the backlight module. However, from another point of view, when using this type of light-concentrating backlight module, when there are fine defects or small foreign objects (such as dust or lint brought in during assembly) between the various film layers of the backlight module, It is easy to be detected in the subsequent optical inspection process of quality control. In other words, this type of backlight module with excellent light collection performance is also poor in concealment of fine defects, resulting in a decrease in the overall assembly yield. Therefore, how to balance the light collection and concealment properties of the backlight module is one of the difficulties that relevant manufacturers face during the design and development.

本新型創作提供一種組裝良率高且集光性較佳的背光模組。The present invention provides a backlight module with high assembly yield and better light collection.

本新型創作的其他目的和優點可以從本新型創作所揭露的技術特徵中得到進一步的了解。Other purposes and advantages of the new creation can be further understood from the technical features disclosed in the new creation.

為達上述之一或部份或全部目的或是其他目的,本新型創作的一實施例提出一種背光模組。背光模組包括導光板、光源、光學膜片、第一稜鏡片以及第二稜鏡片。導光板具有相連接的出光面與入光面。光源設置於導光板的入光面的一側。光學膜片重疊設置於導光板的出光面。光學膜片包括基板、複數個光學微結構以及第一擴散結構層。基板具有相對的入光側與出光側,且入光側朝向導光板。複數個光學微結構設置於基板的入光側,且這些光學微結構的延伸方向相交於導光板的入光面。第一擴散結構層設置於基板的出光側,且重疊於複數個光學微結構。第一稜鏡片與第二稜鏡片重疊設置於光學膜片,且各自具有複數個稜鏡結構。第一稜鏡片與第二稜鏡片位於基板的出光側,且第一稜鏡片位於光學膜片與第二稜鏡片之間。這些光學微結構的延伸方向與第一稜鏡片的多個稜鏡結構的延伸方向之間具有第一夾角。第一稜鏡片的這些稜鏡結構的延伸方向與第二稜鏡片的多個稜鏡結構的延伸方向之間具有第二夾角。第一夾角與第二夾角介於85度至95度之間。In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the invention proposes a backlight module. The backlight module includes a light guide plate, a light source, an optical film, a first film and a second film. The light guide plate has a light exit surface and a light entrance surface connected. The light source is arranged on one side of the light incident surface of the light guide plate. The optical film is overlapped and arranged on the light emitting surface of the light guide plate. The optical film includes a substrate, a plurality of optical microstructures and a first diffusion structure layer. The substrate has opposite light incident and light exit sides, and the light incident side faces the light guide plate. A plurality of optical microstructures are arranged on the light incident side of the substrate, and the extending directions of these optical microstructures intersect the light incident surface of the light guide plate. The first diffusion structure layer is arranged on the light emitting side of the substrate and overlaps the plurality of optical microstructures. The first sheet and the second sheet are overlapped on the optical film, and each has a plurality of sheet structures. The first optical film and the second optical film are located on the light-emitting side of the substrate, and the first optical film is located between the optical film and the second optical film. There is a first included angle between the extension direction of the optical microstructures and the extension direction of the plurality of ridge structures of the first ridge sheet. There is a second included angle between the extension direction of the ridge structures of the first ridge piece and the extension direction of the multiple ridge pieces of the second ridge piece. The first included angle and the second included angle are between 85 degrees and 95 degrees.

在本新型創作的一實施例中,上述的背光模組的多個光學微結構的折射率介於1.46至1.7之間。In an embodiment of the present invention, the refractive index of the multiple optical microstructures of the aforementioned backlight module is between 1.46 and 1.7.

在本新型創作的一實施例中,上述的背光模組的光學膜片的多個光學微結構的延伸方向垂直於導光板的入光面。In an embodiment of the present invention, the extension direction of the multiple optical microstructures of the optical film of the aforementioned backlight module is perpendicular to the light incident surface of the light guide plate.

在本新型創作的一實施例中,上述的背光模組的光學膜片的多個光學微結構的延伸方向與導光板的入光面之間的夾角介於45度至135度。In an embodiment of the present invention, the angle between the extension direction of the multiple optical microstructures of the optical film of the above-mentioned backlight module and the light incident surface of the light guide plate is between 45 degrees and 135 degrees.

在本新型創作的一實施例中,上述的背光模組的多個光學微結構各自具有相對的第一斜面與第二斜面,且第一斜面與第二斜面之間具有頂角,頂角介於75度至95度之間。In an embodiment of the present invention, the plurality of optical microstructures of the above-mentioned backlight module each have a first inclined surface and a second inclined surface opposite to each other, and there is an apex angle between the first slant surface and the second slant surface. Between 75 degrees and 95 degrees.

在本新型創作的一實施例中,上述的背光模組的光學膜片的多個光學微結構包括多個擴散粒子。In an embodiment of the present invention, the multiple optical microstructures of the optical film of the aforementioned backlight module include multiple diffusion particles.

在本新型創作的一實施例中,上述的背光模組的光學膜片的多個光學微結構各自的橫截面為三角形、圓弧形或多邊形。In an embodiment of the present invention, the cross section of each of the multiple optical microstructures of the optical film of the backlight module is triangular, arc-shaped or polygonal.

在本新型創作的一實施例中,上述的背光模組的光學膜片的光學微結構的延伸路徑於導光板的出光面上的垂直投影為波浪狀或折線狀。In an embodiment of the present invention, the vertical projection of the extension path of the optical microstructure of the optical film of the above-mentioned backlight module on the light-emitting surface of the light guide plate is wavy or folded.

在本新型創作的一實施例中,上述的背光模組的第一擴散結構層的霧度值介於5%至50%之間。In an embodiment of the present invention, the haze value of the first diffusion structure layer of the aforementioned backlight module is between 5% and 50%.

在本新型創作的一實施例中,上述的背光模組的第一擴散結構層的材料包括多個擴散粒子。In an embodiment of the present invention, the material of the first diffusion structure layer of the aforementioned backlight module includes a plurality of diffusion particles.

在本新型創作的一實施例中,上述的背光模組的第一擴散結構層的表面具有微結構。In an embodiment of the present invention, the surface of the first diffusion structure layer of the aforementioned backlight module has a microstructure.

在本新型創作的一實施例中,上述的背光模組的第二稜鏡片還具有第二擴散結構層,設置在第二稜鏡片朝向第一稜鏡片的一側。In an embodiment of the present invention, the second diffusive sheet of the aforementioned backlight module further has a second diffusion structure layer, which is arranged on the side of the second diffusive sheet facing the first diffusive sheet.

在本新型創作的一實施例中,上述的背光模組的第二稜鏡片的多個稜鏡結構包括多個擴散粒子。In an embodiment of the present invention, the multiple ridge structures of the second ridge sheet of the backlight module include multiple diffusion particles.

在本新型創作的一實施例中,上述的背光模組的第一稜鏡片與第二稜鏡片的多個稜鏡結構的折射率介於1.62至1.75之間。In an embodiment of the present invention, the refractive index of the multiple ridge structures of the first and second ridges of the backlight module is between 1.62 and 1.75.

在本新型創作的一實施例中,上述的背光模組更包括擴散片,擴散片設置於光學膜片與導光板之間。In an embodiment of the present invention, the above-mentioned backlight module further includes a diffuser, which is arranged between the optical film and the light guide plate.

基於上述,在本新型創作的一實施例的背光模組中,位於稜鏡片與導光板之間的光學膜片具有設置在導光板之出光面一側的多個光學微結構,且透過其光學微結構的延伸方向相交於導光板的入光面,可增加背光模組於正視角附近的整體出光量(亦即,可提升背光模組的集光性)。另一方面,透過光學膜片在遠離光學微結構的一側設有擴散結構層,可提升背光模組的遮瑕性,進而提高背光模組的組裝良率。換言之,也可增加背光模組之各組件的製程容許度(process latitude)。Based on the above, in the backlight module of an embodiment of the invention, the optical film located between the light guide plate and the light guide plate has a plurality of optical microstructures arranged on the side of the light emitting surface of the light guide plate, and transmits the optical film The extension direction of the microstructure intersects the light incident surface of the light guide plate, which can increase the overall light output of the backlight module near the normal viewing angle (that is, it can improve the light collection of the backlight module). On the other hand, the diffusion structure layer is provided on the side far away from the optical microstructure through the optical film, which can improve the concealment of the backlight module, thereby improving the assembly yield of the backlight module. In other words, the process latitude of each component of the backlight module can also be increased.

為讓本新型創作的上述特徵和優點能更明顯易懂,下文特舉實施例,並配合所附圖式作詳細說明如下。In order to make the above-mentioned features and advantages of the new creation more obvious and understandable, the following specific examples are given in conjunction with the accompanying drawings to describe in detail as follows.

有關本新型創作之前述及其他技術內容、特點與功效,在以下配合參考圖式之一較佳實施例的詳細說明中,將可清楚的呈現。以下實施例中所提到的方向用語,例如:上、下、左、右、前或後等,僅是參考附加圖式的方向。因此,使用的方向用語是用來說明並非用來限制本新型創作。The aforementioned and other technical content, features and effects of the creation of the new model will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., only refer to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the creation of the new model.

圖1是本新型創作的第一實施例的背光模組的示意圖。圖2是圖1的背光模組的側視示意圖。圖3是圖1的背光模組的俯視示意圖。圖4是圖1的光學膜片的剖面示意圖。特別說明的是,為清楚呈現起見,圖3僅繪示出圖2的導光板100、光源110、光學微結構122、稜鏡結構132與稜鏡結構142。FIG. 1 is a schematic diagram of the backlight module of the first embodiment of the invention. FIG. 2 is a schematic side view of the backlight module of FIG. 1. FIG. 3 is a schematic top view of the backlight module of FIG. 1. Fig. 4 is a schematic cross-sectional view of the optical film of Fig. 1. In particular, for the sake of clarity, FIG. 3 only shows the light guide plate 100, the light source 110, the optical microstructure 122, the ridge structure 132 and the ridge structure 142 of FIG.

請參照圖1及圖2,背光模組50包括導光板100、光源110與光學膜片120。導光板100具有出光面100a與入光面100b,且出光面100a與入光面100b相連接。光學膜片120重疊設置於導光板100的出光面100a。光源110設置在導光板100的入光面100b的一側。亦即,本實施例的背光模組50為側入式背光模組。然而,本新型創作不限於此,根據其他實施例,背光模組也可以是直下式背光模組(direct backlit module)。需說明的是,在本實施例中,光源110的數量係以五個為例進行示範性地說明,並不代表本新型創作以圖式揭示內容為限制。在其他實施例中,光源110的配置數量可根據背光模組的光學設計而調整。1 and 2, the backlight module 50 includes a light guide plate 100, a light source 110 and an optical film 120. The light guide plate 100 has a light-emitting surface 100a and a light-incident surface 100b, and the light-emitting surface 100a and the light-incident surface 100b are connected. The optical film 120 is overlapped and arranged on the light emitting surface 100 a of the light guide plate 100. The light source 110 is arranged on one side of the light incident surface 100 b of the light guide plate 100. That is, the backlight module 50 of this embodiment is an edge-type backlight module. However, the present invention is not limited to this. According to other embodiments, the backlight module may also be a direct backlit module. It should be noted that, in this embodiment, the number of light sources 110 is exemplified by taking five as an example, which does not mean that the creation of the present invention is limited by the content of the schematic disclosure. In other embodiments, the number of the light sources 110 can be adjusted according to the optical design of the backlight module.

進一步而言,光學膜片120包括基板121、複數個光學微結構122與第一擴散結構層123。基板121具有相對的入光側121a與出光側121b,其中入光側121a朝向導光板100,且這些光學微結構122設置在基板121的入光側121a,其中這些光學微結構122的延伸方向相交於導光板100的入光面100b,且這些光學微結構122可選擇性地與導光板100接觸。在本實施例中,基板121的材質可包括聚對苯二甲酸乙二酯(polyethylene terephthalate,PET)與聚碳酸酯(polycarbonate,PC)。光學微結構122的材質可包括紫外光硬化膠材(UV glue)、或其他適合的高分子聚合物。在一較佳的實施例中,光學微結構122的折射率可介於1.46至1.7之間,但不以此為限。Furthermore, the optical film 120 includes a substrate 121, a plurality of optical microstructures 122 and a first diffusion structure layer 123. The substrate 121 has opposite light-incident sides 121a and light-exit sides 121b, wherein the light-incident side 121a faces the light guide plate 100, and the optical microstructures 122 are arranged on the light-incident side 121a of the substrate 121, wherein the extension directions of the optical microstructures 122 intersect On the light incident surface 100 b of the light guide plate 100, and these optical microstructures 122 can selectively contact the light guide plate 100. In this embodiment, the material of the substrate 121 may include polyethylene terephthalate (PET) and polycarbonate (PC). The material of the optical microstructure 122 may include UV glue, or other suitable high molecular polymers. In a preferred embodiment, the refractive index of the optical microstructure 122 may be between 1.46 and 1.7, but it is not limited thereto.

在本實施例中,光學膜片120的光學微結構122可沿方向X排列於基板121,且在方向Y上延伸。舉例來說,光學微結構122在垂直於延伸方向(即方向Y)的平面(即XZ平面)上的橫截面輪廓可以是三角形。亦即,本實施例的光學微結構122可以是三角稜鏡條,但本新型創作不以此為限,在其他實施例中,光學微結構122在XZ平面上的橫截面輪廓也可根據實際的光型需求(或者是分光效果)而調整。更具體地說,請參照圖2,這些光學微結構122各自具有相對的第一斜面122s1與第二斜面122s2,且第一斜面122s1與第二斜面122s2的交界處定義出光學微結構122的一稜線RL。在本實施例中,光學微結構122在第一斜面122s1與第二斜面122s2之間具有一頂角θ,且頂角θ可介於50度至90度之間,但本新型創作不以此為限。在其他實施例中,光學微結構的頂角θ也可以是90度、介於90度至130度之間、或介於30度至150度之間。在一較佳的實施例中,光學微結構的頂角θ可介於75度至95度之間。In this embodiment, the optical microstructures 122 of the optical film 120 may be arranged on the substrate 121 along the direction X and extend in the direction Y. For example, the cross-sectional profile of the optical microstructure 122 on a plane (that is, the XZ plane) perpendicular to the extension direction (that is, the direction Y) may be triangular. That is, the optical microstructure 122 of this embodiment may be a triangular stripe, but the creation of the present invention is not limited to this. In other embodiments, the cross-sectional profile of the optical microstructure 122 on the XZ plane can also be based on actual conditions. The light type needs (or light splitting effect) and adjusted. More specifically, referring to FIG. 2, each of these optical microstructures 122 has a first inclined surface 122s1 and a second inclined surface 122s2 opposite to each other, and the junction of the first inclined surface 122s1 and the second inclined surface 122s2 defines a portion of the optical microstructure 122 Ridge RL. In this embodiment, the optical microstructure 122 has an apex angle θ between the first inclined surface 122s1 and the second inclined surface 122s2, and the apex angle θ can be between 50 degrees and 90 degrees, but the creation of the new type does not apply to this Is limited. In other embodiments, the apex angle θ of the optical microstructure can also be 90 degrees, between 90 degrees and 130 degrees, or between 30 degrees and 150 degrees. In a preferred embodiment, the apex angle θ of the optical microstructure can be between 75 degrees and 95 degrees.

請參照圖3,在本實施例中,光學微結構122的稜線RL(即延伸路徑)於導光板100之出光面100a上的垂直投影的延伸方向(即方向Y)可選擇性地垂直於導光板100的入光面100b,使背光模組於正視角附近的整體出光量大幅增加。然而,本新型創作不限於此,根據其他實施例,光學微結構122的稜線RL於導光板100上的垂直投影的延伸方向也可不垂直於導光板100的入光面100b,意即,可不特別限定角度。舉例來說,光學微結構122的稜線RL於導光板100上的垂直投影的延伸方向與導光板100的入光面100b之間的夾角可為0度(即平行)、介於0度至46度、介於45度至135度或介於134度至180度。據此,不同的實施態樣均可增加背光模組於正視角附近的整體出光量。3, in this embodiment, the extension direction (ie direction Y) of the vertical projection of the ridge line RL (ie extension path) of the optical microstructure 122 on the light emitting surface 100a of the light guide plate 100 can be selectively perpendicular to the guide plate 100 The light incident surface 100b of the light plate 100 greatly increases the overall light output of the backlight module near the normal viewing angle. However, the present invention is not limited to this. According to other embodiments, the extension direction of the vertical projection of the ridge RL of the optical microstructure 122 on the light guide plate 100 may not be perpendicular to the light incident surface 100b of the light guide plate 100. Limit the angle. For example, the angle between the extending direction of the vertical projection of the ridge line RL of the optical microstructure 122 on the light guide plate 100 and the light incident surface 100b of the light guide plate 100 may be 0 degrees (ie parallel), between 0 degrees and 46 degrees. Degrees, between 45 degrees and 135 degrees, or between 134 degrees and 180 degrees. Accordingly, different implementation aspects can increase the overall light output of the backlight module near the front viewing angle.

請參照圖1及圖4,光學膜片120的第一擴散結構層123設置於基板121的出光側121b,且在導光板100之出光面100a的法線方向(即方向Z)上重疊於多個光學微結構122。舉例來說,光學膜片120的第一擴散結構層123可選擇性地包括感光膠層1231與多個擴散粒子1232,其中這些擴散粒子1232被感光膠層1231所包覆(如圖4所示)。在本實施例中,感光膠層1231的材質例如是紫外光硬化膠材(UV glue)、或其他適合的透明感光膠材。擴散粒子1232的材質可包括聚甲基丙烯酸甲酯(polymethyl methacrylate,PMMA)、聚苯乙烯(polystyrene,PS)、或上述材料的共聚物(copolymer)。另一方面,在本實施例中,第一擴散結構層123的多個擴散粒子1232可以是圓球狀,且具有多種粒徑,但本新型創作不以此為限。在其他實施例中,多個擴散粒子1232也可具有大致上相同的粒徑。1 and 4, the first diffusion structure layer 123 of the optical film 120 is disposed on the light-exit side 121b of the substrate 121, and overlaps in the normal direction (ie direction Z) of the light-emitting surface 100a of the light guide plate 100. One optical microstructure 122. For example, the first diffusion structure layer 123 of the optical film 120 may optionally include a photosensitive adhesive layer 1231 and a plurality of diffusion particles 1232, wherein the diffusion particles 1232 are covered by the photosensitive adhesive layer 1231 (as shown in FIG. 4 ). In this embodiment, the material of the photosensitive glue layer 1231 is, for example, UV glue or other suitable transparent photosensitive glue. The material of the diffusion particles 1232 may include polymethyl methacrylate (PMMA), polystyrene (PS), or a copolymer of the foregoing materials. On the other hand, in this embodiment, the plurality of diffusion particles 1232 of the first diffusion structure layer 123 may be spherical and have various particle sizes, but the invention of the present invention is not limited to this. In other embodiments, the plurality of diffusion particles 1232 may also have substantially the same particle size.

值得一提的是,透過光學膜片120在出光側121b設有第一擴散結構層123,可使光學膜片120具有特定的霧度值(Haze value)。舉例來說,第一擴散結構層123(或者是光學膜片120)的霧度值可介於5%至20%之間、20%至90%之間或5%至90%之間。在一較佳的實施例中,第一擴散結構層123的霧度值可介於5%至50%之間。據此,可提升背光模組的遮瑕性,進而提高背光模組的組裝良率。換句話說,也可增加背光模組之各組件的製程容許度(process latitude)。另一方面,由於第一擴散結構層123(或者是光學膜片120)具有特定的霧度值,因此背光模組50的擴散片(diffuser)數量可進一步縮減,有助於降低生產成本。It is worth mentioning that the transparent optical film 120 is provided with a first diffusion structure layer 123 on the light exit side 121b, so that the optical film 120 can have a specific haze value. For example, the haze value of the first diffusion structure layer 123 (or the optical film 120) may be between 5% and 20%, between 20% and 90%, or between 5% and 90%. In a preferred embodiment, the haze value of the first diffusion structure layer 123 may be between 5% and 50%. Accordingly, the concealment of the backlight module can be improved, and the assembly yield of the backlight module can be improved. In other words, the process latitude of the components of the backlight module can also be increased. On the other hand, since the first diffusion structure layer 123 (or the optical film 120) has a specific haze value, the number of diffusers of the backlight module 50 can be further reduced, which helps reduce production costs.

特別說明的是,在滿足特定的遮瑕需求下,為了將背光模組在正視角附近的整體出光量最大化,光學微結構122的頂角θ可根據第一擴散結構層123的霧度值而調整。舉例來說,在一實施例中,第一擴散結構層123的霧度值為20%,且光學微結構的頂角θ為90度;在另一實施例中,第一擴散結構層123的霧度值為50%,且為了取得相同程度的正向光輝度值(brightness),光學微結構的頂角θ需設計為小於70度。In particular, to meet specific concealment requirements, in order to maximize the overall light output of the backlight module near the front viewing angle, the apex angle θ of the optical microstructure 122 can be changed according to the haze value of the first diffusion structure layer 123 Adjustment. For example, in one embodiment, the haze value of the first diffusion structure layer 123 is 20%, and the apex angle θ of the optical microstructure is 90 degrees; in another embodiment, the haze value of the first diffusion structure layer 123 The haze value is 50%, and in order to obtain the same degree of forward brightness value (brightness), the apex angle θ of the optical microstructure needs to be designed to be less than 70 degrees.

進一步而言,背光模組50更包括第一稜鏡片130與第二稜鏡片140。第一稜鏡片130與第二稜鏡片140在導光板100之出光面100a的法線方向(即方向Z)上重疊於光學膜片120,且位於光學膜片120的基板121的出光側121b(亦即,光學膜片120設有第一擴散結構層123的一側)。第一稜鏡片130位於光學膜片120與第二稜鏡片140之間。具體而言,第一稜鏡片130具有基板131與複數個稜鏡結構132。這些稜鏡結構132沿方向Y排列於基板131遠離光學膜片120的一側表面上,且在方向X上延伸。相似地,第二稜鏡片140具有基板141與複數個稜鏡結構142。這些稜鏡結構142沿方向X排列於基板141遠離第一稜鏡片130的一側表面上,且在方向Y上延伸。需說明的是,本實施例的光學微結構122、稜鏡結構132、稜鏡結構142的數量僅作為示例性的說明之用,並不以圖式揭示內容而加以限制本新型創作。在一些實施例中,光學膜片120的光學微結構122的數量也可不同於稜鏡片的稜鏡結構的數量。Furthermore, the backlight module 50 further includes a first plate 130 and a second plate 140. The first sheet 130 and the second sheet 140 overlap the optical film 120 in the normal direction (ie direction Z) of the light exit surface 100a of the light guide plate 100, and are located on the light exit side 121b of the substrate 121 of the optical film 120 ( That is, the optical film 120 is provided on one side of the first diffusion structure layer 123). The first optical film 130 is located between the optical film 120 and the second optical film 140. Specifically, the first scallop sheet 130 has a substrate 131 and a plurality of scallop structures 132. These ridge structures 132 are arranged on the surface of the substrate 131 away from the optical film 120 along the direction Y, and extend in the direction X. Similarly, the second ridge sheet 140 has a substrate 141 and a plurality of ridge structures 142. The ridge structures 142 are arranged on the side surface of the substrate 141 away from the first ridge piece 130 along the direction X, and extend in the direction Y. It should be noted that the number of optical microstructures 122, ridged structures 132, and ridged structures 142 in this embodiment are only for illustrative purposes, and the content of the disclosure is not limited to the creation of the new type. In some embodiments, the number of the optical microstructures 122 of the optical film 120 may also be different from the number of the optical structures of the optical film.

值得注意的是,在本實施例中,光學膜片120的多個光學微結構122於導光板100上的垂直投影的延伸方向(例如方向Y)垂直於第一稜鏡片130的多個稜鏡結構132於導光板100上的垂直投影的延伸方向(例如方向X)。也就是說,光學膜片120的多個光學微結構122於導光板100上的垂直投影的延伸方向與第一稜鏡片130的多個稜鏡結構132於導光板100上的垂直投影的延伸方向之間的夾角α1為90度,但本新型創作不以此為限。在其他實施例中,光學膜片120的多個光學微結構122於導光板100上的垂直投影的延伸方向與第一稜鏡片130的多個稜鏡結構132於導光板100上的垂直投影的延伸方向之間的夾角α1也可介於85度至95度之間且不等於90度。It is worth noting that, in this embodiment, the extension direction (for example, direction Y) of the vertical projection of the plurality of optical microstructures 122 of the optical film 120 on the light guide plate 100 is perpendicular to the plurality of frames of the first film 130 The extension direction of the vertical projection of the structure 132 on the light guide plate 100 (for example, the direction X). In other words, the extension direction of the vertical projection of the plurality of optical microstructures 122 of the optical film 120 on the light guide plate 100 is the same as the extension direction of the vertical projection of the multiple optical structures 132 of the first film 130 on the light guide plate 100 The included angle α1 is 90 degrees, but the creation of the new model is not limited to this. In other embodiments, the extension direction of the vertical projection of the multiple optical microstructures 122 of the optical film 120 on the light guide plate 100 is the same as the vertical projection of the multiple optical microstructures 132 of the first film 130 on the light guide plate 100 The angle α1 between the extension directions may also be between 85 degrees and 95 degrees and not equal to 90 degrees.

在本實施例中,第一稜鏡片130的多個稜鏡結構132於導光板100上的垂直投影的延伸方向(即方向X)可垂直於第二稜鏡片140的多個稜鏡結構142於導光板100上的垂直投影的延伸方向(即方向Y)。也就是說,第一稜鏡片130的多個稜鏡結構132於導光板100上的垂直投影的延伸方向與第二稜鏡片140的多個稜鏡結構142於導光板100上的垂直投影的延伸方向之間的夾角α2為90度,但本新型創作不以此為限。在其他實施例中,第一稜鏡片130的多個稜鏡結構132的延伸方向也可不垂直且不平行於第二稜鏡片140的多個稜鏡結構142的延伸方向。例如:第一稜鏡片130的多個稜鏡結構132於導光板100上的垂直投影的延伸方向與第二稜鏡片140的多個稜鏡結構142於導光板100上的垂直投影的延伸方向之間的夾角α2也可介於85度至95度之間且不等於90度。在另一實施例中,多個稜鏡結構132於導光板100上的垂直投影的延伸方向可垂直於多個稜鏡結構142於導光板100上的垂直投影的延伸方向,並且光學微結構122的稜線RL於導光板100上的垂直投影的延伸方向可垂直於多個稜鏡結構132於導光板100上的垂直投影的延伸方向,以及光學微結構122的稜線RL於導光板100上的垂直投影的延伸方向與導光板100的入光面100b之間的夾角可為介於45度至135度或不限定角度。在本實施例中,第一稜鏡片130的多個稜鏡結構132與第二稜鏡片140的多個稜鏡結構142的折射率可介於1.62至1.75之間。如此,可進一步提升背光模組50於正視角附近的整體出光量。In this embodiment, the extension direction of the vertical projection of the multiple ridge structures 132 of the first ridge plate 130 on the light guide plate 100 (that is, the direction X) may be perpendicular to the multiple ridge plate structures 142 of the second ridge plate 140. The extension direction of the vertical projection on the light guide plate 100 (ie, direction Y). That is to say, the extension direction of the vertical projection of the multiple ridge structures 132 of the first ridge plate 130 on the light guide plate 100 is the same as the extension of the vertical projection of the multiple ridge structures 142 of the second plate plate 140 on the light guide plate 100 The angle α2 between the directions is 90 degrees, but the creation of the new type is not limited to this. In other embodiments, the extension direction of the multiple ridge structures 132 of the first ridge sheet 130 may not be perpendicular and not parallel to the extension direction of the multiple ridge structures 142 of the second ridge sheet 140. For example: the extension direction of the vertical projection of the multiple ridge structures 132 of the first ridge plate 130 on the light guide plate 100 and the extension direction of the vertical projection of the multiple ridge structures 142 of the second plate 140 on the light guide plate 100 are different The included angle α2 may also be between 85 degrees and 95 degrees and not equal to 90 degrees. In another embodiment, the extension direction of the vertical projection of the plurality of ridge structures 132 on the light guide plate 100 may be perpendicular to the extension direction of the vertical projection of the plurality of ridge structures 142 on the light guide plate 100, and the optical microstructure 122 The extension direction of the vertical projection of the ridge line RL on the light guide plate 100 may be perpendicular to the extension direction of the vertical projection of the plurality of ridge structures 132 on the light guide plate 100, and the vertical projection of the ridge line RL of the optical microstructure 122 on the light guide plate 100 The angle between the extension direction of the projection and the light incident surface 100b of the light guide plate 100 may be between 45 degrees and 135 degrees or an angle is not limited. In this embodiment, the refractive index of the multiple ridge structures 132 of the first ridge sheet 130 and the multiple ridge structures 142 of the second ridge sheet 140 may be between 1.62 and 1.75. In this way, the overall light output of the backlight module 50 near the normal viewing angle can be further increased.

請繼續參照圖1,背光模組50還可選擇性地包括擴散片150,但本新型創作不以此為限。擴散片150重疊設置於第二稜鏡片140,且位於第二稜鏡片140遠離第一稜鏡片130的一側。進一步而言,背光模組50還可包括反射片160,導光板100還具有與出光面100a相對的一底面100c,且反射片160設置在導光板100設有底面100c的一側。舉例來說,本實施例的反射片160可以是白反射片或銀反射片。由於光源110所發出的部分光束,在經由導光板100傳遞的過程中會從導光板100的底面100c出射而造成光能損耗。因此,透過反射片160的設置,可將上述的部分光束反射而傳遞回導光板100,以提高光源110的光能利用率。然而,本新型創作不限於此,在其他實施例中,背光模組也可不具有反射片160。Please continue to refer to FIG. 1, the backlight module 50 may also optionally include a diffusion sheet 150, but the creation of the present invention is not limited to this. The diffusion sheet 150 is overlapped and arranged on the second ridge piece 140 and is located on the side of the second ridge piece 140 away from the first ridge piece 130. Furthermore, the backlight module 50 may further include a reflective sheet 160, the light guide plate 100 further has a bottom surface 100c opposite to the light emitting surface 100a, and the reflective sheet 160 is disposed on the side of the light guide plate 100 where the bottom surface 100c is provided. For example, the reflective sheet 160 of this embodiment may be a white reflective sheet or a silver reflective sheet. As part of the light beam emitted by the light source 110 is transmitted through the light guide plate 100, it will be emitted from the bottom surface 100c of the light guide plate 100, causing light energy loss. Therefore, through the arrangement of the reflective sheet 160, part of the light beam described above can be reflected and transmitted back to the light guide plate 100, so as to improve the light energy utilization rate of the light source 110. However, the present invention is not limited to this, and in other embodiments, the backlight module may not have the reflective sheet 160.

特別說明的是,本新型創作之實施例的背光模組(例如背光模組50)適於搭配非自發光型顯示面板,例如液晶顯示(liquid crystal display,LCD)面板或電泳顯示(electrophoretic display,EPD)面板,以組裝成可用於顯示畫面的電子裝置(即顯示裝置)。也就是說,任何包含非自發光型顯示面板的顯示裝置(display apparatus)且採用本新型創作之實施例的背光模組仍屬於本揭露可採用的技術方案,並不脫離本揭露所欲保護的範圍。In particular, the backlight module (such as the backlight module 50) of the embodiment of the present invention is suitable for matching a non-self-luminous display panel, such as a liquid crystal display (LCD) panel or an electrophoretic display. EPD) panels to be assembled into electronic devices (ie display devices) that can be used to display images. That is to say, any backlight module that includes a non-self-luminous display panel and adopts the embodiment of the invention still belongs to the technical solution that can be adopted in the present disclosure, and does not deviate from what the present disclosure intends to protect. range.

圖5至圖8是本新型創作的另一些實施例的光學膜片的剖面示意圖。特別說明的是,圖5至圖8的任一光學膜片可取代圖1的光學膜片120以形成不同實施態樣的背光模組。請參照圖5,本實施例的光學膜片120A與圖4的光學膜片120的主要差異在於:第一擴散結構層的組成與結構。在本實施例中,光學膜片120A的第一擴散結構層123A不具有擴散粒子,且第一擴散結構層123A遠離基板121的表面123s具有微結構。需說明的是,此處的微結構係以不規則(或亂數分布)的凹凸結構為例進行示範性地說明,並不代表本新型創作以圖式揭示內容為限制。在一些實施例中,第一擴散結構層的微結構也可以是具有週期性分布的凹凸結構,且可透過以微影蝕刻製作模具的方式進行這些凹凸結構的製作,或可採用微影蝕刻製程(photolithography and etching process)直接在第一擴散結構層123A上進行凹凸結構的製作。亦即,第一擴散結構層123A的材料可包括紫外光硬化膠材(UV glue)或光阻材料(photoresist)。值得一提的是,這些凹凸結構的製作方式不以上述方式為限,在其他實施例中可在模具上利用噴砂方式使模具表面具有凹凸狀,再進行UV成形而製作出第一擴散結構層。5 to 8 are schematic cross-sectional views of optical films according to other embodiments of the invention. In particular, any optical film of FIGS. 5 to 8 can replace the optical film 120 of FIG. 1 to form a backlight module of different implementations. Referring to FIG. 5, the main difference between the optical film 120A of this embodiment and the optical film 120 of FIG. 4 lies in the composition and structure of the first diffusion structure layer. In this embodiment, the first diffusion structure layer 123A of the optical film 120A does not have diffusion particles, and the surface 123s of the first diffusion structure layer 123A away from the substrate 121 has a microstructure. It should be noted that the microstructures here are exemplarily illustrated with irregular (or random number distribution) concavo-convex structures, which does not mean that the present invention is limited to the content of the schematic disclosure. In some embodiments, the microstructure of the first diffusion structure layer may also be a periodically distributed concave-convex structure, and these concave-convex structures can be made by using a photolithographic etching process, or a photolithographic etching process can be used. (Photolithography and etching process) The concave-convex structure is directly fabricated on the first diffusion structure layer 123A. That is, the material of the first diffusion structure layer 123A may include UV glue or photoresist. It is worth mentioning that the manufacturing method of these concave-convex structures is not limited to the above method. In other embodiments, sandblasting can be used on the mold to make the surface of the mold concave and convex, and then UV forming is performed to produce the first diffusion structure layer. .

請參照圖6,本實施例的光學膜片120B與圖5的光學膜片120A的主要差異在於:光學微結構與第一擴散結構層的組成。在本實施例中,光學膜片120B的光學微結構122A可包括多個擴散粒子1222(即光學微結構122A也可具有特定的霧度值)。另一方面,可使用具有亂數分布的凹凸微結構的模具(例如滾輪),於設置於基板121之出光側121b的紫外光硬化膠材形成具有亂數分布的凹凸微結構並進行硬化成形,以形成第一擴散結構層123B;或者形成第一擴散結構層123B的方法可包括在基板121之出光側121b的表面上利用紫外光或電漿進行表面粗化的步驟,亦即第一擴散結構層123B與基板121的材質可相同。舉例來說,光學微結構122A的霧度值可小於第一擴散結構層123B的霧度值。然而,本新型創作不限於此,在其他實施例中,光學微結構122A的霧度值與第一擴散結構層123B的霧度值之間的大小關係也可根據光學膜片120B的整體霧度需求而定。在另一實施例中,光學膜片的第一擴散結構層也可不具有微結構或光學膜片不具有第一擴散結構層,亦即,光學膜片所需的霧度係由包含擴散粒子1222的多個光學微結構122A來提供。Please refer to FIG. 6, the main difference between the optical film 120B of this embodiment and the optical film 120A of FIG. 5 lies in the composition of the optical microstructure and the first diffusion structure layer. In this embodiment, the optical microstructure 122A of the optical film 120B may include a plurality of diffusion particles 1222 (that is, the optical microstructure 122A may also have a specific haze value). On the other hand, a mold (such as a roller) with a random distribution of uneven microstructures can be used to form a random distribution of uneven microstructures on the UV-curable adhesive material provided on the light-emitting side 121b of the substrate 121 and then be hardened. To form the first diffusion structure layer 123B; or the method for forming the first diffusion structure layer 123B may include the step of using ultraviolet light or plasma on the surface of the light-emitting side 121b of the substrate 121 to roughen the surface, that is, the first diffusion structure The material of the layer 123B and the substrate 121 may be the same. For example, the haze value of the optical microstructure 122A may be smaller than the haze value of the first diffusion structure layer 123B. However, the present invention is not limited to this. In other embodiments, the relationship between the haze value of the optical microstructure 122A and the haze value of the first diffusion structure layer 123B can also be based on the overall haze of the optical film 120B. Depends on demand. In another embodiment, the first diffusion structure layer of the optical film may not have a microstructure or the optical film does not have the first diffusion structure layer, that is, the haze required by the optical film is composed of diffusion particles 1222. A plurality of optical microstructures 122A are provided.

請參照圖7及圖8,圖7的光學膜片120C、圖8的光學膜片120D與圖5的光學膜片120A的主要差異在於:光學微結構的構型。具體而言,光學膜片120C的光學微結構122B的橫截面輪廓為圓弧形,而光學膜片120D的光學微結構122C的橫截面輪廓為多邊形(亦即,光學微結構122C的橫截面輪廓具有多個折線段)。然而,本新型創作不限於上述實施態樣,上述不同的第一擴散結構層的組成與結構、光學微結構的組成與構型等實施方式,均可依據光學膜片的整體霧度需求而組合應用。7 and 8, the main difference between the optical film 120C of FIG. 7, the optical film 120D of FIG. 8 and the optical film 120A of FIG. 5 is the configuration of the optical microstructure. Specifically, the cross-sectional profile of the optical microstructure 122B of the optical film 120C is circular arc shape, and the cross-sectional profile of the optical microstructure 122C of the optical film 120D is polygonal (that is, the cross-sectional profile of the optical microstructure 122C With multiple polyline segments). However, the invention of the present invention is not limited to the above-mentioned embodiments. The above-mentioned different composition and structure of the first diffusion structure layer and the composition and configuration of the optical microstructure can be combined according to the overall haze requirements of the optical film. application.

圖9A是本新型創作的第二實施例的背光模組的俯視示意圖。圖9B是本新型創作的第三實施例的背光模組的俯視示意圖。請參照圖9A,本實施例的背光模組50A與圖3的背光模組50的差異在於:光學微結構的構型。在本實施例中,光學膜片120E的光學微結構122D的稜線RL-A(即延伸路徑)於導光板100之出光面100a上的垂直投影為折線狀。具體而言,儘管光學微結構122D的延伸路徑為折線狀,其稜線RL-A於導光板100上的垂直投影仍侷限在兩條虛擬直線IL之間。9A is a schematic top view of the backlight module of the second embodiment of the invention. FIG. 9B is a schematic top view of the backlight module of the third embodiment of the present invention. Referring to FIG. 9A, the difference between the backlight module 50A of this embodiment and the backlight module 50 of FIG. 3 lies in the configuration of the optical microstructure. In this embodiment, the vertical projection of the ridge line RL-A (that is, the extension path) of the optical microstructure 122D of the optical film 120E on the light-emitting surface 100a of the light guide plate 100 is a folding line. Specifically, although the extension path of the optical microstructure 122D is in the shape of a broken line, the vertical projection of the ridge line RL-A on the light guide plate 100 is still limited between two virtual straight lines IL.

更具體地說,光學微結構122D的稜線RL-A的多個彎折處於導光板100上的垂直投影分別與兩條虛擬直線IL切齊,且這兩條虛擬直線IL的延伸方向分別垂直於導光板100的入光面100b。也就是說,儘管光學微結構122D的延伸路徑為折線狀,其延伸方向大致上仍垂直於導光板100的入光面100b(即方向Y)。值得一提的是,透過光學微結構122D於導光板100之出光面100a上的垂直投影具有來回彎折的外形,可有效抑制光學膜片120E與兩稜鏡片(例如第一稜鏡片130與第二稜鏡片140)間所產生的亮暗紋現象,即摩爾紋(moiré pattern)。換言之,可提升背光模組50A的出光均勻度。More specifically, the vertical projections of the multiple bends of the ridgeline RL-A of the optical microstructure 122D on the light guide plate 100 are respectively aligned with two virtual straight lines IL, and the extension directions of the two virtual straight lines IL are respectively perpendicular to The light incident surface 100b of the light guide plate 100. That is to say, although the extension path of the optical microstructure 122D is in the shape of a broken line, its extension direction is still substantially perpendicular to the light incident surface 100b of the light guide plate 100 (ie, the direction Y). It is worth mentioning that the vertical projection on the light-emitting surface 100a of the light guide plate 100 through the optical microstructure 122D has a back and forth bending shape, which can effectively suppress the optical film 120E and the two films (for example, the first film 130 and the first film 130). The phenomenon of bright and dark lines between the two 稜鏡 sheets (140) is called moiré pattern. In other words, the light output uniformity of the backlight module 50A can be improved.

請參照圖9B,本實施例的背光模組50A-1與圖9A的背光模組50A的差異在於:光學微結構的構型。在本實施例中,光學膜片120E-1的光學微結構122D-1的任兩相鄰的稜線RL-A於導光板100上的兩垂直投影係以鏡像方式呈現。據此,可進一步抑制光學膜片120E-1與兩稜鏡片(例如第一稜鏡片130與第二稜鏡片140)間所產生的亮暗紋現象。Please refer to FIG. 9B. The difference between the backlight module 50A-1 of this embodiment and the backlight module 50A of FIG. 9A lies in the configuration of the optical microstructure. In this embodiment, the two vertical projections of any two adjacent ridgelines RL-A of the optical microstructure 122D-1 of the optical film 120E-1 on the light guide plate 100 are presented in mirror images. According to this, the bright and dark lines generated between the optical film 120E-1 and the two slabs (for example, the first slab 130 and the second slab 140) can be further suppressed.

圖10A是本新型創作的第四實施例的背光模組的俯視示意圖。圖10B是本新型創作的第五實施例的背光模組的俯視示意圖。請參照圖10A,本實施例的背光模組50B與圖9A的背光模組50A的差異在於:光學微結構的構型。在本實施例中,光學膜片120F的光學微結構122E的稜線RL-B(即延伸路徑)於導光板100之出光面100a上的垂直投影為波浪狀。相似於前述實施例的光學微結構122D(如圖9A所示),在本實施例中,儘管光學微結構122E的延伸路徑為波浪狀(例如是正/餘弦狀曲線),其延伸方向大致上仍垂直於導光板100的入光面100b(即方向Y)。然而,本新型創作不限於此,根據其他實施例,光學微結構的延伸路徑也可以是不具週期性的彎折曲線。值得一提的是,透過光學微結構122E於導光板100之出光面100a上的垂直投影具有來回彎曲的外形,可有效抑制光學膜片120F與兩稜鏡片(如圖1所示的第一稜鏡片130與第二稜鏡片140)間所產生的亮暗紋現象,即摩爾紋(moiré pattern)。換言之,可提升背光模組50B的出光均勻度。FIG. 10A is a schematic top view of the backlight module according to the fourth embodiment of the present invention. 10B is a schematic top view of the backlight module according to the fifth embodiment of the present invention. Please refer to FIG. 10A, the difference between the backlight module 50B of this embodiment and the backlight module 50A of FIG. 9A lies in the configuration of the optical microstructure. In this embodiment, the vertical projection of the ridge line RL-B (that is, the extension path) of the optical microstructure 122E of the optical film 120F on the light exit surface 100a of the light guide plate 100 is wavy. Similar to the optical microstructure 122D of the previous embodiment (as shown in FIG. 9A), in this embodiment, although the extension path of the optical microstructure 122E is wavy (for example, a sine/cosine curve), the extension direction thereof is substantially still It is perpendicular to the light incident surface 100b of the light guide plate 100 (that is, the direction Y). However, the present invention is not limited to this. According to other embodiments, the extension path of the optical microstructure may also be a bending curve without periodicity. It is worth mentioning that the vertical projection of the light-emitting surface 100a of the light guide plate 100 through the optical microstructure 122E has a curved back and forth shape, which can effectively suppress the optical film 120F and the two ridges (as shown in the first edge of Figure 1). The phenomenon of bright and dark lines between the lens 130 and the second lens 140) is called moiré pattern. In other words, the light output uniformity of the backlight module 50B can be improved.

舉例來說,形成光學膜片120F的光學微結構122E的方法可包括在基板121上塗佈一紫外光硬化膠層(或其他適合的樹脂層)以及利用一預置有壓印圖案(例如波浪狀或折線狀的紋路)的模具在上述紫外光硬化膠層上進行壓印,同時利用紫外光源將位於模具與基板121之間的紫外光硬化膠層進行固化。然而,本新型創作不限於此,在其他實施例中,形成光學微結構的方法也可包括利用具有特定外形之刀頭的刀具在上述紫外光硬化膠層進行雕塑。具體而言,刀頭在紫外光硬化膠層上刻劃的過程中,刀頭與基板121會在刀頭行進方向(即方向Y)的垂直方向(即方向X)上相對移動。據此,所形成的光學微結構,在其延伸方向上的波浪狀分布週期可根據刀頭來回移動的週期而定。在另一實施例中,刀頭在紫外光硬化膠層上刻劃的過程中,刀頭會產生垂直於基板方向上的來回移動,利用刀頭擠壓的程度不同可產生葫蘆狀的波浪堆積構型,如圖10B的背光模組50B-1所示。亦即,光學膜片120F-1的光學微結構122E-1的任兩相鄰的稜線RL-B於導光板100上的兩垂直投影係以鏡像方式呈現。據此,可進一步抑制光學膜片120F-1與兩稜鏡片(例如第一稜鏡片130與第二稜鏡片140)間所產生的亮暗紋現象。For example, the method for forming the optical microstructure 122E of the optical film 120F may include coating a UV-curing adhesive layer (or other suitable resin layer) on the substrate 121 and using a pre-prepared embossing pattern (such as wave A mold with a shape or a fold line pattern) is embossed on the above-mentioned ultraviolet light hardening adhesive layer, and at the same time, the ultraviolet light hardening adhesive layer located between the mold and the substrate 121 is cured by an ultraviolet light source. However, the creation of the present invention is not limited to this. In other embodiments, the method of forming the optical microstructure may also include sculpting on the above-mentioned ultraviolet light hardening glue layer using a cutter with a cutter head with a specific shape. Specifically, during the scribing process of the tool head on the UV-curable adhesive layer, the tool head and the substrate 121 will relatively move in a direction (ie direction X) perpendicular to the travel direction of the tool head (ie direction Y). Accordingly, the wave-like distribution period of the formed optical microstructure in the extending direction can be determined according to the period of the tool head moving back and forth. In another embodiment, when the cutter head is scribing on the UV-curable adhesive layer, the cutter head will move back and forth in the direction perpendicular to the substrate, and the degree of extrusion of the cutter head can produce gourd-like wave accumulation. The configuration is shown in the backlight module 50B-1 of FIG. 10B. That is, the two vertical projections of any two adjacent ridge lines RL-B of the optical microstructure 122E-1 of the optical film 120F-1 on the light guide plate 100 are presented in mirror images. Accordingly, it is possible to further suppress the bright and dark lines generated between the optical film 120F-1 and the two scallops (for example, the first scallop 130 and the second scallop 140).

圖11是本新型創作的第六實施例的背光模組的示意圖。圖12是圖11的背光模組的側視示意圖。圖13是圖11的第二稜鏡片的剖面示意圖。請參照圖11至圖13,本實施例的背光模組50C與圖1的背光模組50的差異在於:第二稜鏡片的構型。在本實施例中,第二稜鏡片140A還具有第二擴散結構層143,設置在第二稜鏡片140A朝向第一稜鏡片130的一側,且在方向Z上重疊於多個稜鏡結構142。Fig. 11 is a schematic diagram of a backlight module according to a sixth embodiment of the invention. FIG. 12 is a schematic side view of the backlight module of FIG. 11. Fig. 13 is a schematic cross-sectional view of the second sheet of Fig. 11. Please refer to FIGS. 11 to 13, the difference between the backlight module 50C of this embodiment and the backlight module 50 of FIG. 1 lies in the configuration of the second sheet. In this embodiment, the second diffusive sheet 140A further has a second diffusion structure layer 143, which is disposed on the side of the second diffusive sheet 140A facing the first diffusive sheet 130, and overlaps the plurality of diffusive structures 142 in the direction Z .

舉例來說,第二稜鏡片140A的第二擴散結構層143可選擇性地包括感光膠層1431與多個擴散粒子1432,其中這些擴散粒子1432被感光膠層1431所包覆(如圖13所示)。在本實施例中,感光膠層1431的材質例如是紫外光硬化膠材(UV glue)、或其他適合的透明感光膠材。擴散粒子1432的材質可包括聚甲基丙烯酸甲酯(polymethyl methacrylate,PMMA)、聚苯乙烯(polystyrene,PS)、或上述材料的共聚物(copolymer)。另一方面,在本實施例中,第二擴散結構層143的多個擴散粒子1432可以是圓球狀,且具有多種粒徑,但本新型創作不以此為限。在其他實施例中,多個擴散粒子1432也可具有大致上相同的粒徑。另一方面,由於第二擴散結構層143(或者是第二稜鏡片140A)具有特定的霧度值,因此背光模組50C可不設有如圖1的擴散片150,有助於降低生產成本。然而本新型創作的第二擴散結構層的實施方式不以上述實施例為限,第二擴散結構層亦可以不具擴散粒子,而是以具有微結構表面的方式實施。For example, the second diffusion structure layer 143 of the second sheet 140A may optionally include a photosensitive adhesive layer 1431 and a plurality of diffusion particles 1432, wherein the diffusion particles 1432 are covered by the photosensitive adhesive layer 1431 (as shown in FIG. 13 Show). In this embodiment, the material of the photosensitive glue layer 1431 is, for example, UV glue or other suitable transparent photosensitive glue. The material of the diffusion particles 1432 may include polymethyl methacrylate (PMMA), polystyrene (PS), or a copolymer of the foregoing materials. On the other hand, in this embodiment, the plurality of diffusion particles 1432 of the second diffusion structure layer 143 may be spherical and have various particle sizes, but the invention is not limited to this. In other embodiments, the plurality of diffusion particles 1432 may also have substantially the same particle size. On the other hand, since the second diffusion structure layer 143 (or the second diffusive sheet 140A) has a specific haze value, the backlight module 50C may not be provided with the diffusion sheet 150 as shown in FIG. 1, which helps to reduce the production cost. However, the implementation of the second diffusion structure layer of the present invention is not limited to the above-mentioned embodiments, and the second diffusion structure layer may not have diffusion particles, but be implemented in a manner with a microstructured surface.

圖14是本新型創作的另一實施例的第二稜鏡片的剖面示意圖。請參照圖14,本實施例的第二稜鏡片140B與圖13的第二稜鏡片140A的主要差異在於:稜鏡結構的組成以及第二稜鏡片的構型。在本實施例中,第二稜鏡片140B的稜鏡結構142A可包括多個擴散粒子1422。亦即,稜鏡結構142A可具有特定的霧度值。另一方面,第二稜鏡片140B遠離稜鏡結構142A的一側可不設有第二擴散結構層143(如圖13所示)。亦即,第二稜鏡片140B所需的霧度係由包含擴散粒子1422的多個稜鏡結構142A來提供。然而本新型創作的第二稜鏡片的實施方式不以上述實施例為限,第二稜鏡片亦可以包含具有微結構表面的第二擴散結構層及具有擴散粒子的稜鏡結構的組成方式實施。Fig. 14 is a schematic cross-sectional view of a second scallop sheet according to another embodiment of the present invention. Please refer to FIG. 14, the main difference between the second scallop 140B of this embodiment and the second scallop 140A of FIG. 13 lies in the composition of the scallop structure and the configuration of the second scallop. In this embodiment, the ridge structure 142A of the second ridge piece 140B may include a plurality of diffusion particles 1422. That is, the haze structure 142A may have a specific haze value. On the other hand, the second diffusing structure layer 143 (as shown in FIG. 13) may not be provided on the side of the second diffusing sheet 140B away from the diffusing structure 142A. That is, the haze required by the second ridge sheet 140B is provided by a plurality of ridge ridge structures 142A including diffusion particles 1422. However, the implementation of the second diffusive sheet of the present invention is not limited to the above-mentioned embodiments. The second diffusive sheet may also include a second diffusion structure layer with a micro-structured surface and a diffusive particle structure.

圖15是本新型創作的第七實施例的背光模組的示意圖。請參照圖15,本實施例的背光模組50D與圖1的背光模組50的差異在於:背光模組50D還可包括另一擴散片151,設置於光學膜片120與導光板100之間。透過此擴散片151的設置,可進一步提升背光模組50D的遮瑕性,進而提高背光模組50D的組裝良率。換句話說,也可增加背光模組50D的各組件的製程容許度。15 is a schematic diagram of the backlight module of the seventh embodiment of the invention. Please refer to FIG. 15, the difference between the backlight module 50D of this embodiment and the backlight module 50 of FIG. 1 is that the backlight module 50D may further include another diffuser 151 disposed between the optical film 120 and the light guide plate 100 . Through the arrangement of the diffusion sheet 151, the concealability of the backlight module 50D can be further improved, thereby increasing the assembly yield of the backlight module 50D. In other words, the process tolerance of the components of the backlight module 50D can also be increased.

綜上所述,在本新型創作的一實施例的背光模組中,位於稜鏡片與導光板之間的光學膜片具有設置在導光板之出光面一側的多個光學微結構,且透過其光學微結構的延伸方向相交於導光板的入光面,可增加背光模組於正視角附近的整體出光量(亦即,可提升背光模組的集光性)。另一方面,透過光學膜片在遠離光學微結構的一側設有擴散結構層,可提升背光模組的遮瑕性,進而提高背光模組的組裝良率。換言之,也可增加背光模組之各組件的製程容許度(process latitude)。In summary, in the backlight module of an embodiment of the present invention, the optical film located between the light guide plate and the light guide plate has a plurality of optical microstructures arranged on one side of the light emitting surface of the light guide plate, and transmits The extension direction of the optical microstructure intersects the light incident surface of the light guide plate, which can increase the overall light output of the backlight module near the normal viewing angle (that is, it can improve the light collection of the backlight module). On the other hand, the diffusion structure layer is provided on the side far away from the optical microstructure through the optical film, which can improve the concealment of the backlight module, thereby improving the assembly yield of the backlight module. In other words, the process latitude of each component of the backlight module can also be increased.

雖然本新型創作已以實施例揭露如上,然其並非用以限定本新型創作,任何所屬技術領域中具有通常知識者,在不脫離本新型創作的精神和範圍內,當可作些許的更動與潤飾,故本新型創作的保護範圍當視後附的申請專利範圍所界定者為準。Although the creation of this new type has been disclosed in the above embodiments, it is not intended to limit the creation of this new type. Anyone with ordinary knowledge in the technical field can make some changes and changes without departing from the spirit and scope of the new creation. Retouching, so the scope of protection of the creation of this new model shall be subject to the scope of the attached patent application.

50、50A、50B、50C、50D:背光模組 100:導光板 100a:出光面 100b:入光面 100c:底面 110:光源 120、120A~120F:光學膜片 121、131、141:基板 121a:入光側 121b:出光側 122、122A~122E:光學微結構 122s1、122s2:斜面 1222、1232、1422、1432:擴散粒子 123、123A、123B:第一擴散結構層 123s:表面 1231、1431:感光膠層 130:第一稜鏡片 132、142、142A:稜鏡結構 140、140A、140B:第二稜鏡片 143:第二擴散結構層 150、151:擴散片 160:反射片 IL:虛擬直線 RL、RL-A、RL-B:稜線 X、Y、Z:方向 α1、α2:夾角 θ:頂角 50, 50A, 50B, 50C, 50D: backlight module 100: light guide plate 100a: Glossy surface 100b: Light incident surface 100c: bottom surface 110: light source 120, 120A~120F: optical film 121, 131, 141: substrate 121a: Light side 121b: light emitting side 122, 122A~122E: Optical microstructure 122s1, 122s2: inclined plane 1222, 1232, 1422, 1432: diffuse particles 123, 123A, 123B: first diffusion structure layer 123s: surface 1231, 1431: photosensitive layer 130: The First Snapshot 132, 142, 142A: structure 140, 140A, 140B: the second piece 143: second diffusion structure layer 150, 151: diffuser 160: reflective sheet IL: Virtual straight line RL, RL-A, RL-B: ridge X, Y, Z: direction α1, α2: included angle θ: vertex angle

圖1是本新型創作的第一實施例的背光模組的示意圖。 圖2是圖1的背光模組的側視示意圖。 圖3是圖1的背光模組的俯視示意圖。 圖4是圖1的光學膜片的剖面示意圖。 圖5至圖8是本新型創作的另一些實施例的光學膜片的剖面示意圖。 圖9A是本新型創作的第二實施例的背光模組的俯視示意圖。 圖9B是本新型創作的第三實施例的背光模組的俯視示意圖。 圖10A是本新型創作的第四實施例的背光模組的俯視示意圖。 圖10B是本新型創作的第五實施例的背光模組的俯視示意圖。 圖11是本新型創作的第六實施例的背光模組的示意圖。 圖12是圖11的背光模組的側視示意圖。 圖13是圖11的第二稜鏡片的剖面示意圖。 圖14是本新型創作的另一實施例的第二稜鏡片的剖面示意圖。 圖15是本新型創作的第七實施例的背光模組的示意圖。 FIG. 1 is a schematic diagram of the backlight module of the first embodiment of the invention. FIG. 2 is a schematic side view of the backlight module of FIG. 1. FIG. 3 is a schematic top view of the backlight module of FIG. 1. Fig. 4 is a schematic cross-sectional view of the optical film of Fig. 1. 5 to 8 are schematic cross-sectional views of optical films according to other embodiments of the invention. 9A is a schematic top view of the backlight module of the second embodiment of the invention. FIG. 9B is a schematic top view of the backlight module of the third embodiment of the present invention. FIG. 10A is a schematic top view of the backlight module according to the fourth embodiment of the present invention. 10B is a schematic top view of the backlight module according to the fifth embodiment of the present invention. Fig. 11 is a schematic diagram of a backlight module according to a sixth embodiment of the invention. FIG. 12 is a schematic side view of the backlight module of FIG. 11. Fig. 13 is a schematic cross-sectional view of the second sheet of Fig. 11. Fig. 14 is a schematic cross-sectional view of a second scallop sheet according to another embodiment of the present invention. 15 is a schematic diagram of the backlight module of the seventh embodiment of the invention.

50:背光模組 50: Backlight module

100:導光板 100: light guide plate

100a:出光面 100a: Glossy surface

100b:入光面 100b: Light incident surface

100c:底面 100c: bottom surface

110:光源 110: light source

120:光學膜片 120: Optical diaphragm

121、131、141:基板 121, 131, 141: substrate

121a:入光側 121a: Light side

121b:出光側 121b: light emitting side

122:光學微結構 122: Optical Microstructure

123:第一擴散結構層 123: The first diffusion structure layer

130:第一稜鏡片 130: The First Snapshot

132、142:稜鏡結構 132, 142: 稜鏡 structure

140:第二稜鏡片 140: The second 稜鏡 piece

150:擴散片 150: diffuser

160:反射片 160: reflective sheet

X、Y、Z:方向 X, Y, Z: direction

Claims (15)

一種背光模組,包括: 一導光板,具有相連接的一出光面與一入光面; 一光源,設置於該導光板的該入光面的一側; 一光學膜片,重疊設置於該導光板的該出光面,該光學膜片包括: 一基板,具有相對的一入光側與一出光側,其中該入光側朝向該導光板; 複數個光學微結構,設置於該基板的該入光側,其中該些光學微結構的延伸方向相交於該導光板的該入光面;以及 一第一擴散結構層,設置於該基板的該出光側,且重疊於該些光學微結構;以及 一第一稜鏡片以及一第二稜鏡片,重疊設置於該光學膜片,且各自具有複數個稜鏡結構,該第一稜鏡片與該第二稜鏡片位於該基板的該出光側,該第一稜鏡片位於該光學膜片與該第二稜鏡片之間, 其中該些光學微結構的延伸方向與該第一稜鏡片的該些稜鏡結構的延伸方向之間具有一第一夾角,該第一稜鏡片的該些稜鏡結構的延伸方向與該第二稜鏡片的該些稜鏡結構的延伸方向之間具有一第二夾角,且該第一夾角與該第二夾角介於85度至95度之間。 A backlight module includes: A light guide plate with a light-emitting surface and a light-incident surface connected; A light source arranged on one side of the light incident surface of the light guide plate; An optical film is overlapped and arranged on the light-emitting surface of the light guide plate, and the optical film includes: A substrate having a light entrance side and a light exit side opposite to each other, wherein the light entrance side faces the light guide plate; A plurality of optical microstructures are arranged on the light incident side of the substrate, wherein the extending directions of the optical microstructures intersect the light incident surface of the light guide plate; and A first diffusion structure layer disposed on the light emitting side of the substrate and overlapping the optical microstructures; and A first optical film and a second optical film are overlapped and arranged on the optical film, and each has a plurality of optical film structures. The first optical film and the second optical film are located on the light-emitting side of the substrate, and the first optical film A slab is located between the optical diaphragm and the second slab, Wherein there is a first angle between the extension direction of the optical microstructures and the extension direction of the ridge structures of the first plate, and the extension direction of the ridge structures of the first plate and the second angle There is a second included angle between the extension directions of the noodle structures of the noodle sheet, and the first included angle and the second included angle are between 85 degrees and 95 degrees. 如請求項1所述的背光模組,其中該些光學微結構的折射率介於1.46至1.7之間。The backlight module according to claim 1, wherein the refractive index of the optical microstructures is between 1.46 and 1.7. 如請求項1所述的背光模組,其中該光學膜片的該些光學微結構的延伸方向垂直於該導光板的該入光面。The backlight module according to claim 1, wherein the extension direction of the optical microstructures of the optical film is perpendicular to the light incident surface of the light guide plate. 如請求項1所述的背光模組,該光學膜片的該些光學微結構的延伸方向與該導光板的該入光面之間的夾角介於45度至135度。According to the backlight module of claim 1, the angle between the extending direction of the optical microstructures of the optical film and the light incident surface of the light guide plate is between 45 degrees and 135 degrees. 如請求項1所述的背光模組,其中該些光學微結構各自具有相對的一第一斜面與一第二斜面,且該第一斜面與該第二斜面之間具有一頂角,該頂角介於75度至95度之間。The backlight module of claim 1, wherein each of the optical microstructures has a first inclined surface and a second inclined surface opposite to each other, and there is a vertex angle between the first inclined surface and the second inclined surface, and the top The angle is between 75 degrees and 95 degrees. 如請求項1所述的背光模組,其中該光學膜片的該些光學微結構包括多個擴散粒子。The backlight module according to claim 1, wherein the optical microstructures of the optical film include a plurality of diffusion particles. 如請求項1所述的背光模組,其中該光學膜片的該些光學微結構各自的橫截面為三角形、圓弧形或多邊形。The backlight module according to claim 1, wherein the cross section of each of the optical microstructures of the optical film is triangle, arc or polygon. 如請求項1所述的背光模組,其中該光學膜片的各該光學微結構的延伸路徑於該導光板的該出光面上的垂直投影為波浪狀或折線狀。The backlight module according to claim 1, wherein the vertical projection of the extension path of each optical microstructure of the optical film on the light-emitting surface of the light guide plate is wavy or folded. 如請求項1所述的背光模組,其中該第一擴散結構層的霧度值介於5%至50%之間。The backlight module according to claim 1, wherein the haze value of the first diffusion structure layer is between 5% and 50%. 如請求項1所述的背光模組,其中該第一擴散結構層的材料包括多個擴散粒子。The backlight module according to claim 1, wherein the material of the first diffusion structure layer includes a plurality of diffusion particles. 如請求項1所述的背光模組,其中該第一擴散結構層的一表面具有一微結構。The backlight module according to claim 1, wherein a surface of the first diffusion structure layer has a microstructure. 如請求項1所述的背光模組,其中該第二稜鏡片還具有一第二擴散結構層,設置在該第二稜鏡片朝向該第一稜鏡片的一側。The backlight module according to claim 1, wherein the second diffusive sheet further has a second diffusion structure layer disposed on the side of the second diffusive sheet facing the first diffusive sheet. 如請求項1所述的背光模組,其中該第二稜鏡片的該些稜鏡結構包括多個擴散粒子。The backlight module according to claim 1, wherein the ridge structures of the second ridge sheet include a plurality of diffusion particles. 如請求項1所述的背光模組,其中該第一稜鏡片與該第二稜鏡片的該些稜鏡結構的折射率介於1.62至1.75之間。The backlight module according to claim 1, wherein the refractive index of the ridge structures of the first ridge sheet and the second ridge sheet is between 1.62 and 1.75. 如請求項1所述的背光模組,更包括一擴散片,該擴散片設置於該光學膜片與該導光板之間。The backlight module according to claim 1, further comprising a diffusion sheet, the diffusion sheet being arranged between the optical film and the light guide plate.
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CN109298480A (en) * 2018-08-06 2019-02-01 苏州融达信新材料科技有限公司 A kind of micro-crystal powder light guide plate assembly and its assembly technology
CN111736391A (en) * 2020-08-13 2020-10-02 业成科技(成都)有限公司 Optical assembly and display device
CN114079225A (en) * 2020-08-11 2022-02-22 奇景光电股份有限公司 Optical element and wafer level optical module
TWI765313B (en) * 2020-08-10 2022-05-21 瑞儀光電股份有限公司 Backlight module and display device therewith
WO2023283822A1 (en) * 2021-07-14 2023-01-19 瑞仪(广州)光电子器件有限公司 Backlight module and display device

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CN218383371U (en) * 2022-04-01 2023-01-24 瑞仪光电(南京)有限公司 Backlight module with multiple cone-shaped structures designed on optical film and display device
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109298480A (en) * 2018-08-06 2019-02-01 苏州融达信新材料科技有限公司 A kind of micro-crystal powder light guide plate assembly and its assembly technology
TWI765313B (en) * 2020-08-10 2022-05-21 瑞儀光電股份有限公司 Backlight module and display device therewith
CN114079225A (en) * 2020-08-11 2022-02-22 奇景光电股份有限公司 Optical element and wafer level optical module
CN111736391A (en) * 2020-08-13 2020-10-02 业成科技(成都)有限公司 Optical assembly and display device
WO2023283822A1 (en) * 2021-07-14 2023-01-19 瑞仪(广州)光电子器件有限公司 Backlight module and display device
US11789192B2 (en) 2021-07-14 2023-10-17 Radiant Opto-Electronics Corporation Backlight module and display device

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