TWM608390U

TWM608390U - Backlight module

Info

Publication number: TWM608390U
Application number: TW109212173U
Authority: TW
Inventors: 周明諭; 劉冠彣; 郭浩然
Original assignee: 台灣揚昕股份有限公司
Priority date: 2020-08-05
Filing date: 2020-09-16
Publication date: 2021-03-01
Also published as: CN212624628U

Abstract

A backlight module including a light guide plate, a plurality of light sources, an optical film, a first prism sheet and a second prism sheet is provided. The light sources are disposed on a side of a light incident surface of the light guide plate, and configured to emit a plurality of light beams. The optical film is disposed on a side of a light exiting surface of the light guide plate, and includes a substrate, a plurality of upper-prism microstructures and a plurality of lower-prism microstructures. The upper-prism microstructures are disposed on the upper surface of the substrate. The lower-prism microstructures are disposed on the lower surface of the substrate, wherein an extension direction of each lower-prism microstructure and an extension direction of each upper-prism microstructure are perpendicular to each other. The first prism sheet is disposed on a side of the upper surface of the optical film, and the optical film is disposed between the light guide plate and the first prism sheet. The first prism sheet is disposed between the optical film and the second prism sheet.

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.

導光板最主要的功能在於導引光線的方向，提高面板的光學輝度，以及調控亮度的均勻性。利用導光板的全反射特性，在光從導光板的入光面進入導光板後，可將光往導光板的另一端傳遞。並且為了控制光從導光板的出光面射出，會在導光板相對於出光面的底面佈上網點等微結構。當光的傳遞遇到網點時，因改變光的行進方向，使光可以從導光板的出光面出光。The main function of the light guide plate is to guide the direction of light, improve the optical brightness of the panel, and regulate the uniformity of brightness. Utilizing the total reflection characteristic of the light guide plate, after light enters the light guide plate from the light incident surface of the light guide plate, the light can be transmitted to the other end of the light guide plate. In addition, in order to control the emission of light from the light-emitting surface of the light guide plate, microstructures such as dots are arranged on the bottom surface of the light guide plate relative to the light-emitting surface. When the transmission of light encounters the dots, the light can be emitted from the light-emitting surface of the light guide plate by changing the direction of light travel.

然而，如何能提高輝度效率，使得顯示器能在較少耗電的情況下就能達到相同輝度的效果，一直是背光模組的發展目標。However, how to improve the brightness efficiency so that the display can achieve the same brightness effect with less power consumption has always been the development goal of the backlight module.

本新型創作提供一種背光模組，其能使光源所發出的光束有效地被轉換為輝度。The present invention provides a backlight module, which can effectively convert the light beam emitted by the light source into brightness.

本新型創作的一實施例提供一種背光模組，其包括導光板、多個光源、光學膜片、第一稜鏡片以及第二稜鏡片。導光板具有入光面、出光面以及底面，其中入光面連接於出光面及底面之間，且出光面相對於底面。多個光源設置於導光板的入光面的一側，且用以發出多個光束。光學膜片設置於導光板的出光面的一側，且包括基板、多個上稜鏡微結構以及多個下稜鏡微結構。基板包括上表面及相對的下表面。多個上稜鏡微結構設置於上表面上。多個下稜鏡微結構設置於下表面上，其中每一下稜鏡微結構的延伸方向與每一上稜鏡微結構的延伸方向互相垂直。第一稜鏡片設置於光學膜片的上表面的一側，且光學膜片設置於導光板與第一稜鏡片之間。第一稜鏡片設置於光學膜片與第二稜鏡片之間。An embodiment of the present invention provides a backlight module, which includes a light guide plate, a plurality of light sources, an optical film, a first film and a second film. The light guide plate has a light-incident surface, a light-emitting surface, and a bottom surface, wherein the light-incident surface is connected between the light-emitting surface and the bottom surface, and the light-emitting surface is opposite to the bottom surface. The multiple light sources are arranged on one side of the light incident surface of the light guide plate and used for emitting multiple light beams. The optical film is arranged on one side of the light emitting surface of the light guide plate, and includes a substrate, a plurality of upper microstructures and a plurality of lower microstructures. The substrate includes an upper surface and an opposite lower surface. A plurality of upper microstructures are arranged on the upper surface. A plurality of lower microstructures are arranged on the lower surface, and the extending direction of each lower microstructure and the extending direction of each upper microstructure are perpendicular to each other. The first optical film is arranged on one side of the upper surface of the optical film, and the optical film is arranged between the light guide plate and the first optical film. The first optical film is arranged between the optical film and the second optical film.

在本新型創作的一實施例中，上述的光學膜片的這些下稜鏡微結構與導光板的出光面直接接觸。In an embodiment of the present invention, the lower microstructures of the above-mentioned optical film are in direct contact with the light-emitting surface of the light guide plate.

在本新型創作的一實施例中，上述的光學膜片的每一下稜鏡微結構在垂直這些下稜鏡微結構的延伸方向上的切面呈等腰三角形。In an embodiment of the present invention, the cross section of each of the lower microstructures of the above-mentioned optical film in the direction perpendicular to the extension direction of the lower microstructures is an isosceles triangle.

在本新型創作的一實施例中，上述的光學膜片的每一上稜鏡微結構具有出光斜面以及連接斜面，且出光斜面的面積大於連接斜面的面積。In an embodiment of the present invention, each of the upper microstructures of the above-mentioned optical film has a light-emitting slope and a connecting slope, and the area of the light-emitting slope is larger than the area of the connecting slope.

在本新型創作的一實施例中，上述的出光斜面與上表面之間的夾角小於連接斜面與上表面之間的夾角。In an embodiment of the present invention, the angle between the above-mentioned light-emitting inclined surface and the upper surface is smaller than the angle between the connecting inclined surface and the upper surface.

在本新型創作的一實施例中，上述的光學膜片的上表面或下表面更包括平坦區。平坦區鄰近導光板的入光面，且平坦區不設置這些上稜鏡微結構及這些下稜鏡微結構。In an embodiment of the present invention, the upper surface or the lower surface of the above-mentioned optical film further includes a flat area. The flat area is adjacent to the light-incident surface of the light guide plate, and these upper and lower microstructures are not arranged in the flat area.

在本新型創作的一實施例中，上述的光學膜片的這些下稜鏡微結構的延伸方向垂直入光面。In an embodiment of the present invention, the extension direction of the lower microstructures of the above-mentioned optical film is perpendicular to the light incident surface.

在本新型創作的一實施例中，上述的第一稜鏡片具有多個第一稜鏡微結構，且這些第一稜鏡微結構的延伸方向與光學膜片的這些上稜鏡微結構的延伸方向互相垂直。In an embodiment of the present invention, the above-mentioned first film has a plurality of first film microstructures, and the extension direction of the first film microstructures is the same as the extension of the upper film microstructures of the optical film. The directions are perpendicular to each other.

在本新型創作的一實施例中，上述的第二稜鏡片具有多個第二稜鏡微結構，且這些第二稜鏡微結構的延伸方向與光學膜片的這些上稜鏡微結構的延伸方向互相平行。In an embodiment of the present invention, the above-mentioned second scallop sheet has a plurality of second scallop microstructures, and the extension direction of these second scallop microstructures is the same as the extension of the upper scallop microstructures of the optical film. The directions are parallel to each other.

在本新型創作的一實施例中，上述的光學膜片的材質包括擴散粒子。In an embodiment of the present invention, the material of the above-mentioned optical film includes diffusion particles.

基於上述，在本新型創作的實施例的背光模組中，由於背光模組在導光板的出光面設置了光學膜片，光學膜片在上與下表面分別設有上稜鏡微結構與下稜鏡微結構，且下稜鏡微結構的延伸方向與上稜鏡微結構的延伸方向互相垂直，因此，本新型創作的實施例的背光模組的光束從光學膜片出光後的光型可相似於光學模擬後的較佳的視角等輝線圖。Based on the above, in the backlight module of the embodiment of the present invention, since the backlight module is provided with an optical film on the light-emitting surface of the light guide plate, the optical film is provided with an upper microstructure and a lower surface respectively on the upper and lower surfaces. The microstructures of the bottom are perpendicular to each other, and the extension direction of the microstructures of the bottom is perpendicular to the direction of extension of the microstructures of the top. Therefore, the light type of the light beam of the backlight module of the embodiment of the present invention after the light is emitted from the optical film can be It is similar to the better viewing angle contour map after optical simulation.

圖1是依據本新型創作的一實施例的背光模組的立體示意圖。請參考圖1，本新型創作的一實施例提供一種背光模組100，其包括導光板120、多個光源110、光學膜片130、第一稜鏡片140以及第二稜鏡片150。在本實施例中，多個光源110設置於導光板120的一側面，且導光板120、光學膜片130、第一稜鏡片140及第二稜鏡片150依序疊置。FIG. 1 is a three-dimensional schematic diagram of a backlight module according to an embodiment of the present invention. Please refer to FIG. 1, an embodiment of the present invention provides a backlight module 100, which includes a light guide plate 120, a plurality of light sources 110, an optical film 130, a first film 140 and a second film 150. In this embodiment, a plurality of light sources 110 are arranged on one side surface of the light guide plate 120, and the light guide plate 120, the optical film 130, the first film 140 and the second film 150 are sequentially stacked.

圖2A及圖2B是分別依據本新型創作的一實施例的背光模組的導光板的立體及剖面示意圖。請同時參考圖1、圖2A及圖2B，在本實施例中，導光板120的材質可為塑膠、玻璃或其他合適的材質，但本新型創作不以此為限。導光板120具有入光面120S1、出光面120S2以及底面120S3，其中入光面120S1連接於出光面120S2及底面120S3之間，且出光面120S2相對於底面120S3，舉例來說，出光面120S2平行於底面120S3，且入光面120S1垂直於出光面120S2，但本新型創作不以此為限。在本實施例中，導光板120還可具有多個側面120S4。側面120S4可與入光面120S1、出光面120S2以及底面120S3相連接，或側面120S4可與出光面120S2以及底面120S3相連接。2A and 2B are three-dimensional and cross-sectional schematic diagrams of the light guide plate of the backlight module according to an embodiment of the present invention. Please refer to FIG. 1, FIG. 2A and FIG. 2B at the same time. In this embodiment, the material of the light guide plate 120 can be plastic, glass or other suitable materials, but the invention is not limited to this. The light guide plate 120 has a light-incident surface 120S1, a light-emitting surface 120S2, and a bottom surface 120S3. The light-incident surface 120S1 is connected between the light-emitting surface 120S2 and the bottom surface 120S3, and the light-emitting surface 120S2 is opposite to the bottom surface 120S3. For example, the light-emitting surface 120S2 is parallel to The bottom surface 120S3, and the light-incident surface 120S1 is perpendicular to the light-emitting surface 120S2, but the creation of the present invention is not limited to this. In this embodiment, the light guide plate 120 may also have a plurality of side surfaces 120S4. The side surface 120S4 can be connected to the light incident surface 120S1, the light exit surface 120S2, and the bottom surface 120S3, or the side surface 120S4 can be connected to the light exit surface 120S2 and the bottom surface 120S3.

在本實施例中，導光板120的底面120S3可設置多個光學微結構122。光學微結構122例如是網點結構或稜鏡結構，但本新型創作不以此為限。In this embodiment, the bottom surface 120S3 of the light guide plate 120 may be provided with a plurality of optical microstructures 122. The optical microstructure 122 is, for example, a dot structure or a tang structure, but the creation of the present invention is not limited to this.

進一步來說，請參考圖2B，在本實施例中，光源110可為發光二極體（Light-emitting diode, LED）或其他合適的光源。光源110設置於導光板120的入光面120S1的一側，且用以發出多個光束B。光束B在穿透導光板120的入光面120S1而入射導光板120後，光束B於導光板120中以全反射的方式傳遞。當光束B傳遞至光學微結構122時，光學微結構122改變光束B的行進方向，並使得光束B穿透出光面120S2而朝向光學膜片130傳遞。Further, referring to FIG. 2B, in this embodiment, the light source 110 may be a light-emitting diode (LED) or other suitable light sources. The light source 110 is disposed on one side of the light incident surface 120S1 of the light guide plate 120, and is used to emit a plurality of light beams B. After the light beam B penetrates the light incident surface 120S1 of the light guide plate 120 and enters the light guide plate 120, the light beam B is transmitted in the light guide plate 120 in a manner of total reflection. When the light beam B is transmitted to the optical microstructure 122, the optical microstructure 122 changes the traveling direction of the light beam B, and causes the light beam B to pass through the optical surface 120S2 and transmit toward the optical film 130.

在本實施例中，背光模組100更可選擇性地包括反射片160，反射片160設置於導光板120的底面120S3的一側。由於光源110所發出的光束B的一部份，在經由導光板120傳遞的過程中會從導光板120的底面120S3出射而無法順利朝向光學膜片130傳遞，造成光能損耗。因此，透過反射片160的設置，可將從導光板120的底面120S3出射的光束B反射而傳遞回導光板120並朝向光學膜片130傳遞，以提高光源110的光能利用率。In this embodiment, the backlight module 100 may further optionally include a reflective sheet 160, and the reflective sheet 160 is disposed on one side of the bottom surface 120S3 of the light guide plate 120. Since a part of the light beam B emitted by the light source 110 is transmitted through the light guide plate 120 from the bottom surface 120S3 of the light guide plate 120 and cannot be smoothly transmitted toward the optical film 130, light energy loss is caused. Therefore, through the arrangement of the reflective sheet 160, the light beam B emitted from the bottom surface 120S3 of the light guide plate 120 can be reflected, transmitted back to the light guide plate 120 and transmitted toward the optical film 130, so as to improve the light energy utilization rate of the light source 110.

圖3A至圖3C是分別依據本新型創作的一實施例的背光模組的光學膜片的立體、前視及側視示意圖。請同時參考圖1、圖2A、圖3A至圖3C，在本實施例中，光學膜片130設置於導光板120的出光面120S2的一側，且包括基板136、多個上稜鏡微結構132以及多個下稜鏡微結構134。在本實施例中，基板136的材質可為聚對苯二甲酸乙二酯（polyethylene terephthalate, PET）、聚碳酸酯（polycarbonate, PC）或其他合適的材質。上稜鏡微結構132以及下稜鏡微結構134的材質可為紫外光硬化膠材（UV glue）或其他適合的高分子聚合物。3A to 3C are three-dimensional, front-view and side-view schematic diagrams of the optical film of the backlight module according to an embodiment of the invention, respectively. Please refer to FIGS. 1, 2A, and 3A to 3C at the same time. In this embodiment, the optical film 130 is disposed on one side of the light emitting surface 120S2 of the light guide plate 120, and includes a substrate 136 and a plurality of upper microstructures 132 and a plurality of microstructures 134. In this embodiment, the material of the substrate 136 may be polyethylene terephthalate (PET), polycarbonate (PC) or other suitable materials. The material of the upper microstructure 132 and the lower microstructure 134 may be UV glue or other suitable high molecular polymers.

在一實施例中，光學膜片130的材質可選擇性地包括擴散粒子（圖未示），用以提高光學膜片130的霧度值（Haze value）。擴散粒子例如可設置於基板136、上稜鏡微結構132或下稜鏡微結構134。由於光學膜片130的材質可包括擴散粒子，因此，背光模組100的遮瑕性較佳，進而提高背光模組100的組裝良率。換句話說，也可增加背光模組100的各組件的製程容許度（process latitude）。另一方面，由於光學膜片130的霧度值提高了，因此背光模組100的擴散片（diffuser）數量可進一步縮減，有助於降低生產成本。In one embodiment, the material of the optical film 130 may optionally include diffusion particles (not shown) to increase the haze value of the optical film 130. The diffusion particles can be disposed on the substrate 136, the upper microstructure 132 or the lower microstructure 134, for example. Since the material of the optical film 130 may include diffusing particles, the concealing property of the backlight module 100 is better, thereby improving the assembly yield of the backlight module 100. In other words, the process latitude of the components of the backlight module 100 can also be increased. On the other hand, since the haze value of the optical film 130 is increased, the number of diffusers of the backlight module 100 can be further reduced, which helps to reduce the production cost.

在本實施例中，基板136包括上表面136S1及相對的下表面136S2。上稜鏡微結構132設置於上表面136S1上。下稜鏡微結構134設置於下表面136S2上。光學膜片130的下稜鏡微結構134與導光板120的出光面120S2可為直接接觸，以使光束B能有效地從導光板120傳遞至光學膜片130。因此，背光模組100的光能利用率較高。In this embodiment, the substrate 136 includes an upper surface 136S1 and an opposite lower surface 136S2. The upper microstructure 132 is disposed on the upper surface 136S1. The microstructure 134 is disposed on the lower surface 136S2. The lower microstructure 134 of the optical film 130 and the light-emitting surface 120S2 of the light guide plate 120 may be in direct contact, so that the light beam B can be effectively transmitted from the light guide plate 120 to the optical film 130. Therefore, the light energy utilization rate of the backlight module 100 is relatively high.

請再參考圖1與圖3A，在本實施例中，光學膜片130的每一下稜鏡微結構134的延伸方向（例如圖3A中的Y軸方向）與每一上稜鏡微結構132的延伸方向（例如圖3A中的X軸方向）之間具有一夾角。在一較佳的實施例中，下稜鏡微結構134的延伸方向與上稜鏡微結構132的延伸方向互相垂直，但本新型創作不以此為限。當下稜鏡微結構134的延伸方向與上稜鏡微結構132的延伸方向互相垂直時，背光模組100整體上的光損較小，使得光能利用率較高。此外，圖1示意了光學膜片130的下稜鏡微結構134的延伸方向垂直入光面120S1。但本新型創作不以此為限，在一實施例中，光學膜片130的下稜鏡微結構134的延伸方向與導光板120的入光面120S1可不互相垂直，例如光學膜片130的下稜鏡微結構134的延伸方向與導光板120的入光面120S1的夾角為90度±10度。Please refer to FIGS. 1 and 3A again. In this embodiment, the extension direction of each lower microstructure 134 of the optical film 130 (for example, the Y-axis direction in FIG. 3A) and the extension direction of each upper microstructure 132 There is an angle between the extending directions (for example, the X-axis direction in FIG. 3A). In a preferred embodiment, the extending direction of the lower microstructure 134 and the extending direction of the upper microstructure 132 are perpendicular to each other, but the invention is not limited to this. When the extension direction of the lower microstructure 134 and the extension direction of the upper microstructure 132 are perpendicular to each other, the overall light loss of the backlight module 100 is small, so that the light energy utilization rate is higher. In addition, FIG. 1 illustrates that the extension direction of the lower microstructure 134 of the optical film 130 is perpendicular to the light incident surface 120S1. However, the present invention is not limited to this. In an embodiment, the extension direction of the lower microstructure 134 of the optical film 130 and the light incident surface 120S1 of the light guide plate 120 may not be perpendicular to each other, for example, the lower part of the optical film 130 The included angle between the extending direction of the ridged microstructure 134 and the light incident surface 120S1 of the light guide plate 120 is 90°±10°.

再者，在本實施例中，光學膜片130的上表面136S1更包括平坦區F。平坦區F鄰近導光板120的入光面120S1，且平坦區F為露出上表面136S1的平坦表面，亦即，平坦區F不設置上稜鏡微結構132或其他微結構，但本新型創作不以此為限。在其他實施例中，平坦區F可設置於光學膜片130的下表面136S2，且平坦區F不設置下稜鏡微結構134或其他微結構。在本新型創作的實施例的背光模組100中，由於光學膜片130可包括平坦區F，因此，背光模組100的出光光型於入光面120S1的一側的mura熱點（hot spot）的問題能有效被改善。Furthermore, in this embodiment, the upper surface 136S1 of the optical film 130 further includes a flat area F. The flat area F is adjacent to the light incident surface 120S1 of the light guide plate 120, and the flat area F is a flat surface exposing the upper surface 136S1, that is, the flat area F is not provided with the upper ridge microstructure 132 or other microstructures, but the invention does not Limit this. In other embodiments, the flat area F may be provided on the lower surface 136S2 of the optical film 130, and the flat area F is not provided with the lower microstructure 134 or other microstructures. In the backlight module 100 of the embodiment of the present invention, since the optical film 130 may include the flat area F, the light emitting type of the backlight module 100 is at the mura hot spot on the side of the light incident surface 120S1. The problem can be effectively improved.

請再參考圖3B，在本實施例中，光學膜片130的每一下稜鏡微結構134在垂直下稜鏡微結構134的延伸方向上的切面（例如平行於圖3B中的XZ平面）呈等腰三角形。此等腰三角形下稜鏡微結構134可使通過的一道光線在X軸方向被分為兩道光線。Please refer to FIG. 3B again. In this embodiment, each of the lower microstructures 134 of the optical film 130 has a cross section perpendicular to the extension direction of the lower microstructure 134 (for example, parallel to the XZ plane in FIG. 3B). Isosceles triangle. The isosceles triangle microstructure 134 can divide a passing light into two light rays in the X-axis direction.

請再參考圖3C，在本實施例中，光學膜片130的每一上稜鏡微結構132具有出光斜面132S1以及連接斜面132S2，且出光斜面132S1的面積可等於或大於連接斜面132S2的面積，意即，出光斜面132S1與上表面136S1之間的夾角θ1可等於或小於連接斜面132S2與上表面136S1之間的夾角θ2。舉例來說，在圖3C的實施例中，藉由上稜鏡微結構132的出光斜面132S1的面積大於連接斜面132S2的面積的設計下，光線從出光斜面132S1的出光可在YZ平面上的投影呈一特定光型。也就是說，可以藉由調整角度θ1與θ2，使得此特定光型符合背光模組100所需的出光光型，可使本新型創作的實施例的背光模組100的光能利用率進一步地提高。Please refer to FIG. 3C again. In this embodiment, each upper microstructure 132 of the optical film 130 has a light-emitting slope 132S1 and a connecting slope 132S2, and the area of the light-emitting slope 132S1 may be equal to or larger than the area of the connecting slope 132S2. That is, the included angle θ1 between the light emitting slope 132S1 and the upper surface 136S1 may be equal to or less than the included angle θ2 between the connecting slope 132S2 and the upper surface 136S1. For example, in the embodiment of FIG. 3C, with the design in which the area of the light-emitting slope 132S1 of the upper microstructure 132 is larger than the area of the connecting slope 132S2, the light emitted from the light-emitting slope 132S1 can be projected on the YZ plane Presents a specific light type. That is to say, by adjusting the angles θ1 and θ2, the specific light type meets the light emission type required by the backlight module 100, and the light energy utilization rate of the backlight module 100 of the embodiment of the present invention can be further improved. improve.

圖4是依據本新型創作的一實施例的背光模組的第一稜鏡片的立體示意圖。請同時參考圖1與圖4，在本實施例中，第一稜鏡片140設置於光學膜片130的上表面136S1的一側，且光學膜片130設置於導光板120與第一稜鏡片140之間。FIG. 4 is a three-dimensional schematic diagram of the first sheet of the backlight module according to an embodiment of the present invention. Please refer to FIGS. 1 and 4 at the same time. In this embodiment, the first optical film 140 is disposed on one side of the upper surface 136S1 of the optical film 130, and the optical film 130 is disposed on the light guide plate 120 and the first optical film 140 between.

在本實施例中，第一稜鏡片140例如是光學增亮膜（Brightness Enhancement Film, BEF）。第一稜鏡片140具有多個第一稜鏡微結構142，且第一稜鏡微結構142的延伸方向（例如圖4中的Y軸方向）與光學膜片130的上稜鏡微結構132的延伸方向（例如圖3A中的X軸方向）互相垂直。In this embodiment, the first film 140 is, for example, a Brightness Enhancement Film (BEF). The first sheet 140 has a plurality of first microstructures 142, and the extension direction of the first microstructures 142 (for example, the Y-axis direction in FIG. 4) is the same as the upper microstructure 132 of the optical film 130 The extension directions (for example, the X-axis direction in FIG. 3A) are perpendicular to each other.

圖5是依據本新型創作的一實施例的背光模組的第二稜鏡片的立體示意圖。請同時參考圖1與圖5，在本實施例中，第一稜鏡片140設置於光學膜片130與第二稜鏡片150之間。FIG. 5 is a three-dimensional schematic diagram of a second sheet of the backlight module according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 5 at the same time. In this embodiment, the first optical film 140 is disposed between the optical film 130 and the second optical film 150.

在本實施例中，第二稜鏡片150例如是光學增亮膜。第二稜鏡片150具有多個第二稜鏡微結構152，且第二稜鏡微結構152的延伸方向（例如圖5中的X軸方向）與光學膜片130的上稜鏡微結構132的延伸方向互相平行。In this embodiment, the second sheet 150 is, for example, an optical brightness enhancement film. The second sheet 150 has a plurality of second microstructures 152, and the extension direction of the second microstructure 152 (for example, the X-axis direction in FIG. 5) is the same as that of the upper microstructure 132 of the optical film 130 The extension directions are parallel to each other.

此外，在一實施例中，背光模組100更包括擴散片170，其中第二稜鏡片150設置於擴散片170與第一稜鏡片140之間。由於背光模組100設置了擴散片170，且擴散片170進一步使背光模組100的出光被均勻化，因此，背光模組100的出光光型更加均勻。In addition, in one embodiment, the backlight module 100 further includes a diffusion sheet 170, wherein the second diffusive sheet 150 is disposed between the diffusing sheet 170 and the first diffusive sheet 140. Since the backlight module 100 is provided with the diffusion sheet 170, and the diffusion sheet 170 further uniformizes the light output of the backlight module 100, the light output pattern of the backlight module 100 is more uniform.

進一步來說，請參閱圖1、圖3A、圖4與圖5，第一稜鏡片140的第一稜鏡微結構142的延伸方向為Y軸方向，第二稜鏡片150的第二稜鏡微結構152的延伸方向為X軸方向，且光學膜片130的下稜鏡微結構134的延伸方向與上稜鏡微結構132的延伸方向互相垂直，第一稜鏡片140的第一稜鏡微結構142的延伸方向與光學膜片130的上稜鏡微結構132的延伸方向互相垂直，以及第二稜鏡片150的第二稜鏡微結構152的延伸方向與光學膜片130的上稜鏡微結構132的延伸方向互相平行，因此本新型創作的背光模組100的光能利用率可被提高，但本新型創作不以此為限。在其他實施例中，第一稜鏡片140的第一稜鏡微結構142的延伸方向可為X軸方向，第二稜鏡片150的第二稜鏡微結構152的延伸方向為Y軸方向，且光學膜片130的下稜鏡微結構134的延伸方向與上稜鏡微結構132的延伸方向互相垂直，第一稜鏡片140的第一稜鏡微結構142的延伸方向與光學膜片130的上稜鏡微結構132的延伸方向互相平行，以及第二稜鏡片150的第二稜鏡微結構152的延伸方向與光學膜片130的上稜鏡微結構132的延伸方向互相垂直，亦可使本新型創作的背光模組100的光能利用率被提高。特別說明的是，在本新型創作中所提及的兩延伸方向互相平行或互相垂直，並不限於完全平行或完全垂直，可依不同的需求（例如解決moire現象）而使兩延伸方向夾180度±5度或90度±5度，均可視為互相平行或互相垂直。More specifically, referring to FIGS. 1, 3A, 4, and 5, the extension direction of the first microstructure 142 of the first microchip 140 is the Y-axis direction, and the second microstructure of the second microchip 150 The extending direction of the structure 152 is the X-axis direction, and the extending direction of the lower microstructure 134 of the optical film 130 and the extending direction of the upper microstructure 132 are perpendicular to each other, and the first microstructure of the first thin film 140 The extension direction of 142 and the extension direction of the upper microstructure 132 of the optical film 130 are perpendicular to each other, and the extension direction of the second microstructure 152 of the second film 150 and the upper microstructure of the optical film 130 are perpendicular to each other. The extension directions of the 132 are parallel to each other, so the light energy utilization rate of the backlight module 100 of the invention can be improved, but the invention is not limited to this. In other embodiments, the extending direction of the first microstructures 142 of the first thin plate 140 may be the X-axis direction, and the extending direction of the second microstructures 152 of the second thin plate 150 is the Y-axis direction, and The extension direction of the lower microstructure 134 of the optical film 130 and the extension direction of the upper microstructure 132 are perpendicular to each other, and the extension direction of the first microstructure 142 of the first film 140 is the same as that of the upper surface of the optical film 130. The extension directions of the microstructures 132 are parallel to each other, and the extension direction of the second microstructure 152 of the second microstructure 150 and the extension direction of the upper microstructure 132 of the optical film 130 are perpendicular to each other, which can also make the present The light energy utilization rate of the newly created backlight module 100 is improved. In particular, the two extension directions mentioned in the creation of the new model are parallel or perpendicular to each other, and are not limited to being completely parallel or completely perpendicular. The two extension directions can be clamped by 180 according to different requirements (such as solving the moire phenomenon). Degrees ±5 degrees or 90 degrees ±5 degrees can be regarded as mutually parallel or perpendicular to each other.

圖6是依據光學模擬，光束傳遞至第一稜鏡片前，背光模組的一較佳的實施例的視角等輝線圖。由於光線具有可逆性，因此，欲設計背光模組100的出光光型為正向（例如圖1的Z軸方向）且均勻出光，經由以光學模擬軟體（例如LightTools）逆追跡（reversely tracking）至光束B傳遞至第一稜鏡片140前的出光光型，可取得如圖6所示的視角等輝線圖。請參考圖6，圖6示意了視角等輝線圖具有四個亮區，且此四個亮區代表光束B可被轉換為輝度的最佳區域。也就是說，當本新型創作的實施例的背光模組100的光束B從光學膜片130出光後的光型可相似於圖6的視角等輝線圖時（即光型具有四個亮區），背光模組100的光能利用率較高。FIG. 6 is an isochogram of a viewing angle of a preferred embodiment of the backlight module before the light beam is transmitted to the first sheet according to the optical simulation. Due to the reversibility of light, it is desired to design the backlight module 100 to emit light in a positive direction (such as the Z-axis direction in FIG. 1) and uniformly emit light, through reversely tracking with optical simulation software (such as LightTools). The light beam B is transmitted to the light emitting type before the first ridge sheet 140, and the viewing angle isobath diagram as shown in FIG. 6 can be obtained. Please refer to FIG. 6. FIG. 6 shows that the viewing angle isoluminescence diagram has four bright areas, and the four bright areas represent the best area where the light beam B can be converted into brightness. In other words, when the light beam B of the backlight module 100 of the embodiment of the present invention is created from the optical film 130, the light pattern can be similar to the viewing angle isobath diagram of FIG. 6 (that is, the light pattern has four bright areas) , The light energy utilization rate of the backlight module 100 is relatively high.

綜上所述，在本新型創作的實施例的背光模組中，由於背光模組在導光板的出光面的一側設置了光學膜片，光學膜片在上表面與下表面分別設有上稜鏡微結構與下稜鏡微結構，且下稜鏡微結構的延伸方向與上稜鏡微結構的延伸方向互相垂直，因此，本新型創作的實施例的背光模組的光束從光學膜片出光後的光型可相似於光學模擬後的較佳的視角等輝線圖。相較於市場上的背光模組在導光板的出光面的一側設置擴散片或光學增亮膜等方式，本新型創作的實施例的背光模組在輝度的增益上提高了1.3倍。To sum up, in the backlight module of the embodiment of the invention, since the backlight module is provided with an optical film on one side of the light-emitting surface of the light guide plate, the optical film is provided on the upper surface and the lower surface respectively. The microstructures of the ridge and the microstructures of the bottom ridge, and the extension direction of the microstructures of the bottom ridge and the extension direction of the top ridge microstructure are perpendicular to each other. Therefore, the light beam of the backlight module of the embodiment of the present invention is created from the optical film The light type after the light is emitted can be similar to the better viewing angle isoluminescence map after optical simulation. Compared with the backlight module on the market where a diffuser or an optical brightness enhancement film is arranged on one side of the light-emitting surface of the light guide plate, the backlight module of the embodiment of the present invention has an increase in brightness gain by 1.3 times.

惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專利範圍及發明說明內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。另外，本發明的任一實施例或申請專利範圍不須達成本發明所揭露之全部目的或優點或特點。此外，摘要部分和標題僅是用來輔助專利文件搜尋之用，並非用來限制本發明之權利範圍。此外，本說明書或申請專利範圍中提及的「第一」、「第二」等用語僅用以命名元件（element）的名稱或區別不同實施例或範圍，而並非用來限制元件數量上的上限或下限。However, the above are only preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the description of the invention, All are still within the scope of the invention patent. In addition, any embodiment of the present invention or the scope of the patent application does not have to achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract part and title are only used to assist in searching for patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the element (element) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. Upper or lower limit.

100:背光模組 110:光源 120:導光板 120S1:入光面 120S2:出光面 120S3:底面 120S4:側面 122:光學微結構 130:光學膜片 132:上稜鏡微結構 132S1:出光斜面 132S2:連接斜面 134:下稜鏡微結構 136:基板 136S1、140S1、150S1:上表面 136S2、140S2、150S2:下表面 140:第一稜鏡片 142:第一稜鏡微結構 150:第二稜鏡片 152:第二稜鏡微結構 160:反射片 170:擴散片 B:光束 F:平坦區 θ1、θ2:夾角100: Backlight module 110: light source 120: light guide plate 120S1: Glossy surface 120S2: Glossy surface 120S3: bottom surface 120S4: side 122: Optical Microstructure 130: optical diaphragm 132: The microstructure of the upper 稜鏡 132S1: light-emitting slope 132S2: Connection slope 134: Microstructure 136: Substrate 136S1, 140S1, 150S1: upper surface 136S2, 140S2, 150S2: bottom surface 140: The First Snapshot 142: The first microstructure 150: The second 稜鏡 piece 152: The second microstructure 160: reflective sheet 170: diffuser B: beam F: Flat zone θ1, θ2: included angle

圖1是依據本新型創作的一實施例的背光模組的立體示意圖。圖2A及圖2B是分別依據本新型創作的一實施例的背光模組的導光板的立體及剖面示意圖。圖3A至圖3C是分別依據本新型創作的一實施例的背光模組的光學膜片的立體、前視及側視示意圖。圖4是依據本新型創作的一實施例的背光模組的第一稜鏡片的立體示意圖。圖5是依據本新型創作的一實施例的背光模組的第二稜鏡片的立體示意圖。圖6是依據光學模擬，光束傳遞至第一稜鏡片前，背光模組的一較佳的實施例的視角等輝線圖。 FIG. 1 is a three-dimensional schematic diagram of a backlight module according to an embodiment of the present invention. 2A and 2B are three-dimensional and cross-sectional schematic diagrams of the light guide plate of the backlight module according to an embodiment of the present invention. 3A to 3C are three-dimensional, front-view and side-view schematic diagrams of the optical film of the backlight module according to an embodiment of the invention, respectively. FIG. 4 is a three-dimensional schematic diagram of the first sheet of the backlight module according to an embodiment of the present invention. FIG. 5 is a three-dimensional schematic diagram of a second sheet of the backlight module according to an embodiment of the present invention. FIG. 6 is an isochogram of a viewing angle of a preferred embodiment of the backlight module before the light beam is transmitted to the first sheet according to the optical simulation.

100:背光模組 100: Backlight module

110:光源 110: light source

120:導光板 120: light guide plate

120S1:入光面 120S1: Glossy surface

120S2:出光面 120S2: Glossy surface

122:光學微結構 122: Optical Microstructure

130:光學膜片 130: optical diaphragm

132:上稜鏡微結構 132: The microstructure of the upper 稜鏡

134:下稜鏡微結構 134: Microstructure

140:第一稜鏡片 140: The First Snapshot

142:第一稜鏡微結構 142: The first microstructure

150:第二稜鏡片 150: The second 稜鏡 piece

152:第二稜鏡微結構 152: The second microstructure

160:反射片 160: reflective sheet

170:擴散片 170: diffuser

F:平坦區 F: Flat zone

Claims

一種背光模組，包括：一導光板，具有一入光面、一出光面以及一底面，其中該入光面連接於該出光面及該底面之間，且該出光面相對於該底面；多個光源，設置於該導光板的該入光面的一側，且用以發出多個光束；一光學膜片，設置於該導光板的該出光面的一側，包括：一基板，包括一上表面及相對的一下表面；多個上稜鏡微結構，設置於該上表面上；以及多個下稜鏡微結構，設置於該下表面上，其中每一該些下稜鏡微結構的延伸方向與每一該些上稜鏡微結構的延伸方向互相垂直；一第一稜鏡片，設置於該光學膜片的該上表面的一側，且該光學膜片設置於該導光板與該第一稜鏡片之間；以及一第二稜鏡片，其中該第一稜鏡片設置於該光學膜片與該第二稜鏡片之間。 A backlight module includes: A light guide plate having a light-incident surface, a light-emitting surface, and a bottom surface, wherein the light-incident surface is connected between the light-emitting surface and the bottom surface, and the light-emitting surface is opposite to the bottom surface; A plurality of light sources are arranged on one side of the light incident surface of the light guide plate and used for emitting a plurality of light beams; An optical film, which is arranged on one side of the light-emitting surface of the light guide plate, includes: A substrate, including an upper surface and an opposite lower surface; A plurality of upper microstructures are arranged on the upper surface; and A plurality of lower microstructures are arranged on the lower surface, wherein the extending direction of each of the lower microstructures and the extending direction of each of the upper microstructures are perpendicular to each other; A first optical film arranged on one side of the upper surface of the optical film, and the optical film is arranged between the light guide plate and the first optical film; and A second optical film, wherein the first optical film is disposed between the optical film and the second optical film.

如請求項1所述的背光模組，其中該光學膜片的該些下稜鏡微結構與該導光板的該出光面直接接觸。The backlight module according to claim 1, wherein the lower microstructures of the optical film are in direct contact with the light-emitting surface of the light guide plate.

如請求項1所述的背光模組，其中該光學膜片的每一該些下稜鏡微結構在垂直該些下稜鏡微結構的延伸方向上的切面呈等腰三角形。The backlight module according to claim 1, wherein the cross section of each of the lower microstructures of the optical film perpendicular to the extension direction of the lower microstructures is an isosceles triangle.

如請求項1所述的背光模組，其中該光學膜片的每一該些上稜鏡微結構具有一出光斜面以及一連接斜面，且該出光斜面的面積大於該連接斜面的面積。The backlight module of claim 1, wherein each of the upper microstructures of the optical film has a light-emitting slope and a connecting slope, and the area of the light-emitting slope is larger than the area of the connecting slope.

如請求項4所述的背光模組，其中該出光斜面與該上表面之間的夾角小於該連接斜面與該上表面之間的夾角。The backlight module according to claim 4, wherein the angle between the light-emitting slope and the upper surface is smaller than the angle between the connecting slope and the upper surface.

如請求項1所述的背光模組，其中該光學膜片的該上表面或該下表面更包括一平坦區，該平坦區鄰近該導光板的該入光面，且該平坦區不設置該些上稜鏡微結構及該些下稜鏡微結構。The backlight module according to claim 1, wherein the upper surface or the lower surface of the optical film further includes a flat area, the flat area is adjacent to the light incident surface of the light guide plate, and the flat area is not provided with the Some upper and lower microstructures.

如請求項1所述的背光模組，其中該光學膜片的該些下稜鏡微結構的延伸方向垂直該入光面。The backlight module of claim 1, wherein the extension direction of the lower microstructures of the optical film is perpendicular to the light incident surface.

如請求項1所述的背光模組，其中該第一稜鏡片具有多個第一稜鏡微結構，且該些第一稜鏡微結構的延伸方向與該光學膜片的該些上稜鏡微結構的延伸方向互相垂直。The backlight module of claim 1, wherein the first beam has a plurality of first beam microstructures, and the extension direction of the first beam microstructures is consistent with the upper beams of the optical film The extension directions of the microstructures are perpendicular to each other.

如請求項8所述的背光模組，其中該第二稜鏡片具有多個第二稜鏡微結構，且該些第二稜鏡微結構的延伸方向與該光學膜片的該些上稜鏡微結構的延伸方向互相平行。The backlight module according to claim 8, wherein the second beam has a plurality of second beam microstructures, and the extension direction of the second beam microstructures is consistent with the upper beams of the optical film The extension directions of the microstructures are parallel to each other.

如請求項1所述的背光模組，其中該光學膜片的材質包括擴散粒子。The backlight module according to claim 1, wherein the material of the optical film includes diffusion particles.