Backlight module and display device

Abstract

The utility model relates to a backlight module and a display device applying the backlight module, the backlight module comprises a reflector plate, a first attaching layer, a microstructure light guide film, a second attaching layer, an inverse prism layer, a base material layer, a third attaching layer, a polarization function layer and an atomization layer which are sequentially stacked from bottom to top, and the reflector plate, the first attaching layer, the microstructure light guide film, the second attaching layer, the inverse prism layer, the base material layer, the third attaching layer, the polarization function layer and the atomization layer are bonded through an optical transparent adhesive to form a single film structure. The reflector plate is made of a high-reflectivity material, the micro-structure light guide film is provided with a micro-wedge-shaped structure and an arc groove light-emitting surface, the inverse prism layer has optimized vertex angle and R angle design and equal-width prism group layout, and efficient utilization and uniform distribution of light rays are jointly achieved. The base material layer is made of high-light-transmittance and low-haze materials, balance of optical performance and economical efficiency is guaranteed, the light source is arranged on the side face of the microstructure light guide film, and uniform scattering of light is achieved through the efficient light guide performance of the light guide film. In addition, the utility model further provides a display device comprising the backlight module, and the overall visual effect of the display device is improved by fusing the backlight module and a display panel.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a backlight module and a display device. Background Art

[0002] The display effect of consumer electronic products needs to meet high standards. Not only is the pursuit of extremely bright and colorful pictures, but also the security and privacy protection of information are increasingly emphasized, which has given rise to the development of the anti-peeping concept display technology and market. To meet these requirements, the inverse prism collimating backlight module technology has emerged as one of the technologies to improve display performance and enhance information confidentiality. By cleverly combining a microstructured light guide plate and an inverse prism design, this technology realizes the efficient utilization of light and the precise control of the light output angle, ensuring both high brightness output of the screen and the unique anti-peeping function.

[0003] Specifically, this technology utilizes the principle of total internal reflection of light and the LGP (Light Guide Plate) and prism structures, enabling the light incident from the side to be efficiently redirected and vertically emitted from the front of the screen, greatly reducing the energy loss during light transmission, thereby significantly enhancing the brightness and clarity of the front view. At the same time, by controlling the light output angle, the light leakage from the side view is effectively restricted, achieving the anti-peeping effect and meeting the needs of business and personal privacy protection. Although the inverse prism collimating backlight module technology has been improved, it still faces some challenges in practical applications. Especially for inverse prism products, due to their sharp apex structures, it is extremely easy to cause damage to the microstructures during the module assembly process, which not only increases the production difficulty but also seriously affects the process yield and product quality. In addition, the complex assembly process also limits the improvement of production efficiency.

[0004] Therefore, it is necessary to further improve the high-gain optical composite film to solve the problem of easy damage of traditional inverse prisms and improve the process yield and cutting and assembly efficiency. Summary of the Utility Model

[0005] The purpose of this application is to provide a backlight module with high optical gain, which can avoid the adsorption and abrasion between each material during use. The backlight module includes a reflective sheet, a first bonding layer, a microstructured light guide film, a second bonding layer, an inverse prism layer, a substrate layer, a third bonding layer, a polarizing function layer, and an atomization layer stacked in sequence from bottom to top;

[0006] The reflective sheet is bonded to the microstructured light guide film through the first bonding layer, the microstructured light guide film is bonded to the inverse prism layer through the second bonding layer, and the polarizing function layer is bonded to the substrate layer through the third bonding layer;

[0007] The surface of the microstructured light guide film in contact with the first bonding layer is a wedge-shaped structure;

[0008] The atomization layer is formed on the surface of the polarizing functional layer facing the third bonding layer;

[0009] Wherein, the reflective sheet, the first bonding layer, the microstructure light guide film, the second bonding layer, the retroreflective prism layer, the substrate layer, the third bonding layer, the polarizing functional layer and the atomization layer are integrated into a single film sheet.

[0010] In one embodiment, the material of the substrate layer is PET, PC or PMMA, the thickness of the substrate layer is in the range of 25 - 250 μm, the light transmittance of the substrate layer is greater than 90%, and the haze of the substrate layer is less than 1%.

[0011] In one embodiment, the apex angle of the retroreflective prism is in the range of 60 - 70°.

[0012] In one embodiment, the apex tip of the retroreflective prism is an R angle, and the radius of the R angle is in the range of 0 - 4 μm.

[0013] In one embodiment, the prisms in the retroreflective prism layer are of equal width, and the bottom width of the prism is in the range of 10 - 50 μm.

[0014] In one embodiment, the prisms in the retroreflective prism layer are formed by a plurality of prism groups, each prism group includes a wide prism and two or more narrow prisms, the bottom width of the wide prism is in the range of 25 - 45 μm, and the bottom width of the narrow prism is 50 - 70% of the bottom width of the wide prism.

[0015] In one embodiment, the short side of the structure of the microstructure light guide film is a plane or an arc surface.

[0016] In one embodiment, the light-emitting surface of the microstructure light guide film is an arc groove structure, the groove opening pitch is in the range of 30 - 40 μm, and the arc radius is in the range of 20 - 25 μm.

[0017] In one embodiment, the backlight module further includes a light source, and the light source is disposed on the side of the microstructure light guide film.

[0018] In addition, the present application also provides a display device, including a display panel and the foregoing backlight module.

[0019] Compared with the prior art, the present application has the following beneficial effects: The backlight module laminates multiple layers into a single composite film, effectively avoiding direct contact between materials, significantly reducing the risk of adsorption and abrasion, enhancing the stiffness and anti-warpage performance of the backlight module, and ensuring the stability and durability of the product. Integrating multiple-layer structures into a single film simplifies the production process, realizes high efficiency in cutting and assembling, not only improves production efficiency but also reduces production costs. By attaching multiple functional layers, sufficient stiffness is obtained, eliminating the need for protective films when each layer of material is used separately, achieving a production and use condition without protective films throughout the process, greatly saving material costs. Compared with the separate cutting, inspection, and assembly required for multiple films, the use of a single film can also significantly reduce labor and man-hours. This method supports the roll-to-roll production method, further improving production efficiency and material utilization rate, and promoting the innovation of backlight module manufacturing technology.

[0020] By combining a microstructure light guide film with a wedge-shaped structure and a carefully designed reverse prism layer, high optical gain, enhanced light guiding and uniformity are achieved, thereby improving display brightness and contrast. In addition, through further optimization of components such as the apex angle, R angle, and prism structure, the optical performance and stability of the backlight module are improved. The backlight module of the present application performs excellently in terms of improving optical performance, enhancing durability, increasing production efficiency, and improving process yield, and has broad application prospects and market value. Brief Description of the Drawings

[0021] Figure 1 is a schematic cross-sectional structure diagram of the backlight module in an embodiment of the present application;

[0022] Figure 2 is a schematic overall structure diagram of the backlight module in an embodiment of the present application;

[0023] Figure 3 is a schematic optical effect diagram of the backlight module in an embodiment of the present application.

[0024] Description of the reference numerals: 110, the first bonding layer; 120, the second bonding layer; 130, the third bonding layer; 200, the reflector; 300, the microstructure light guide film; 400, the reverse prism layer; 500, the substrate layer; 600, the polarization functional layer; 700, the atomization layer. Detailed Description of the Embodiments

[0025] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. It can be understood that the specific embodiments described herein are only for explaining the present application and not for limiting the present application. Additionally, it should be noted that for ease of description, only the parts related to the present application rather than all the structures are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0026] The terms "including" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0027] Referring to the embodiments herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0028] Please refer to Figures 1 to 2 As shown, the backlight module in a preferred embodiment of the present application has high optical gain, high stiffness, and anti-warpage performance, enhancing the scratch and wear resistance of the retroreflective prism product, and can avoid the adsorption and abrasion between each piece of material during use. It includes a reflective sheet 200, a first bonding layer 110, a microstructure light guide film 300, a second bonding layer 120, a retroreflective prism layer 400, a substrate layer 500, a third bonding layer 130, a polarizing functional layer 600, and an atomization layer 700, which are stacked in sequence from bottom to top. The reflective sheet 200 is bonded to the microstructure light guide film 300 through the first bonding layer 110, the microstructure light guide film 300 is bonded to the retroreflective prism layer 400 through the second bonding layer 120, the polarizing functional layer 600 is bonded to the substrate layer 500 through the third bonding layer 130. The surface of the microstructure light guide film 300 in contact with the first bonding layer 110 is a wedge-shaped structure, and the atomization layer 700 is formed on the surface of the polarizing functional layer 600 opposite to the third bonding layer 130. Among them, the reflective sheet 200, the first bonding layer 110, the microstructure light guide film 300, the second bonding layer 120, the retroreflective prism layer 400, the substrate layer 500, the third bonding layer 130, the polarizing functional layer 600, and the atomization layer 700 are integrated into a single film sheet.

[0029] The reflective sheet 200, as the bottom layer of the backlight module, is made of a high-reflectivity material to effectively recycle the unused light. The bonding layer can be formed by an optically transparent adhesive. The adhesive layer not only provides a firm bond between the layers but also ensures unobstructed light transmission and reduces light loss. The microstructure light guide film 300 is designed with a micro-wedge structure. Through the refraction and reflection of the microstructure, it guides the light to be evenly distributed on the entire surface of the backlight module, enhancing the light uniformity. The inverse prism layer 400 is located above the microstructure light guide film 300 and consists of a series of arranged inverse prism structures. Through these inverse prisms, the exit angle of the light is precisely controlled, improving the directivity of the light. Through the synergistic effect of the microstructure light guide film 300 and the inverse prism layer 400, the efficient utilization and precise control of the light are achieved, significantly enhancing the optical gain of the backlight module. The layers are bonded together by a high-precision optically transparent adhesive to form a solid integral structure, which can effectively resist external impacts and scratches. Integrating the multi-layer structure into a single film not only simplifies the production process but also improves the production efficiency and product consistency, and reduces the production cost.

[0030] Please refer to Figure 3 , Figure 3 , which is a schematic diagram of the optical effect of the backlight module in the embodiment of the present application. After the side-entry LED light source is converted into a surface light source through the light guide plate, the light passes through the inverse prism to improve the light use efficiency and restrict the light exit angle. The adjusted light is then split by the reflective polarizing layer, separating the light into two groups, namely the transmitted linearly polarized light and the reflected light. The reflected light passes through the inverse prism and the light guide film again, and after being reflected by the bottom reflective sheet 200, it will be split by the reflective polarizing layer again until all the transmitted light is gradually converted into linearly polarized light. Therefore, after the light emitted by the LED light source passes through the product of this case, narrow exit angle linearly polarized light with low loss can be obtained, achieving excellent optical effects.

[0031] To ensure the high light transmittance performance, excellent scratch resistance, wear resistance and weather resistance of the backlight module, and to provide a stable and reliable base for the entire module, the substrate layer 500, as the core support structure of the backlight module, carefully selects materials such as PET (polyethylene terephthalate), PC (polycarbonate) or PMMA (polymethyl methacrylate) with high light transmittance, low haze and good mechanical properties. In terms of thickness design, the thickness of the substrate layer 500 is in the range of 25 - 250 μm. The light transmittance of the substrate layer 500 is greater than 90%, and the haze of the substrate layer 500 is less than 1%. This ensures that when light passes through the substrate layer 500, it can retain its original intensity to the greatest extent, reduce light loss, and improve the overall light efficiency. At the same time, the haze of the substrate layer 500 is controlled at an extremely low level of less than 1%, and light hardly scatters when passing through the substrate layer 500, ensuring the high definition and high contrast of the backlight module. On the premise of ensuring optical performance and mechanical strength, a reasonable thickness design also takes into account the control of manufacturing costs, enabling the backlight module to maintain good economy while possessing high performance.

[0032] When designing the inverse prism structure, the apex angle of the inverse prism is in the range of 60 - 70°, which is the optimal solution obtained based on in-depth optical analysis and simulation experiments. The precise control of the apex angle is crucial for the light guiding effect of the inverse prism in the backlight module, directly affecting the refraction path and distribution uniformity of light. Setting the apex angle of the inverse prism between 60° and 70° can make light refract more ideally when passing through the prism, thereby guiding the light to propagate in a predetermined direction. This optimized refraction path helps to reduce light scattering and loss, and improve the utilization efficiency of light. The apex angle of the inverse prism is directly related to the refraction angle and exit direction of light inside it. By controlling this angle, the light exiting from the inverse prism can be more evenly distributed throughout the backlight module, reducing the generation of light spots and dark areas, and improving the overall brightness uniformity of the picture. The preferred apex angle is preferably any value between 66° and 68°. Further,

[0033] To further optimize the optical performance and mechanical strength of the inverse prism, its apex tip adopts an R angle design, that is, the apex tip is not a sharp right angle, but is transitioned by a small arc. The apex tip of the inverse prism is an R angle, and the radius of the R angle is in the range of 0 - 4 μm. The presence of the R angle effectively reduces light scattering at the apex tip of the inverse prism. A sharp right angle is prone to be the source of light scattering, while a small R angle can smooth the transition of light, enabling light to refract along the expected path, thereby improving the utilization efficiency of light and the overall brightness of the backlight module. The R angle design also enhances the mechanical strength of the inverse prism. During manufacturing and use, a sharp right angle is more vulnerable to stress concentration and damage, while the R angle can disperse these stresses and reduce the risk of damage caused by mechanical shock or vibration.

[0034] In order to ensure the efficiency and consistency of the inverse prism layer 400 in the backlight module, the prisms in this layer are designed to be equal-width structures, that is, the bottom width of each prism remains consistent, and the bottom width of the prism is in the range of 10-50μm, which not only ensures the effective refraction of light by the prism, but also avoids excessive scattering of light caused by the prism being too wide. The bottom width of the prism is selected in the range of 10 to 50μm. Such a design enables light to propagate more accurately along a predetermined path, reduces light waste, and improves light utilization efficiency. The equal-width prism design also simplifies the manufacturing process of the backlight module. During the manufacturing process, a unified mold and process parameters can be used to produce prisms, thereby improving production efficiency and consistency of product quality.

[0035] Specifically, the prisms in the inverse prism layer 400 are formed by a plurality of prism groups, each prism group includes a wide prism and two or more narrow prisms, and the arrangement in the prism group preferably includes a wide prism and five narrow prisms, the bottom width of the wide prism is in the range of 25-45 μm, and the bottom width of the narrow prism is 50-70% of the bottom width of the wide prism. By adjusting the width ratio of the prism group, the backlight module can produce a more delicate and uniform lighting effect, and the design of the prism group provides a higher design flexibility for the backlight module. By adjusting the number, arrangement and bottom width ratio of wide prisms and narrow prisms, customized designs can be made for different display requirements and application scenarios.

[0036] In order to further optimize the light conduction and distribution performance of the microstructure light-guiding film 300, the short side of the structure of the microstructure light-guiding film 300 is a plane or an arc surface. The design of the short side as a plane allows the light to be emitted directly and efficiently when it reaches the edge, reducing the ineffective reflection and absorption of the light inside the light-guiding film. The design of the short side as an arc surface realizes the natural scattering of light in the propagation process through the curved surface effect of the arc. Whether the short side design is a plane or an arc surface, it can optimize the visual experience of the display device by adjusting the direction and distribution of light emission.

[0037] Specifically, the light-emitting surface of the microstructure light-guiding film 300 is an arc groove structure, the groove spacing is in the range of 30-40μm, the arc radius is in the range of 20-25μm, and the groove spacing is set between 30 and 40μm. This range has been verified through calculation and experiments, and can ensure that the light forms light spots on the light-emitting surface that are neither too dense nor too sparse, thereby achieving optimal visual uniformity. At the same time, the arc radius is limited to the range of 20 to 25μm. This design allows the light to be softly and evenly scattered at the edge of the arc groove, effectively reducing glare and enhancing the softness and layering of the picture.

[0038] Specifically, the backlight module further includes a light source, and the light source is disposed on the side of the microstructured light guide film 300. Disposing the light source on the side of the microstructured light guide film 300 enables light to directly enter the interior of the light guide film, avoiding unnecessary losses of light in the transmission path in a conventional backlight module. At the same time, the high-efficiency light guiding performance of the microstructured light guide film 300 ensures uniform propagation of light within the film, further improving the light utilization efficiency. The side-lighting design in combination with the arc groove structure of the microstructured light guide film 300 achieves uniform scattering of light on the light-emitting surface, not only enhancing the overall brightness of the picture but also reducing the occurrence of uneven phenomena such as light spots and dark areas.

[0039] In addition, the present application further provides a display device, including a display panel and the aforementioned backlight module. The display device integrates the display panel and the backlight module of the present application. By virtue of the excellent performance of the backlight module in terms of light uniformity, brightness control, and energy efficiency improvement, it fully exploits the advantages of the display panel in aspects such as color reproduction and image clarity.

[0040] The following details the backlight module of the present application through multiple specific manufacturing steps and studies the corresponding performance, thereby obtaining a preferred specific implementation. The specific tests include a shielding test, an adsorption test, a brightness ratio, and a viewing angle. Specific Embodiment 1

[0042] The backlight module includes a reflective sheet, a first bonding layer, a microstructured light guide film, a second bonding layer, a reverse prism layer, a substrate layer, a third bonding layer, a polarization functional layer, and an atomization layer stacked in sequence from bottom to top. Among them, the reverse prism in the reverse prism layer is an equal-height sharp-angle reverse prism, the bottom width is selected to be 18 μm, the apex angle is selected to be 67°, the apex does not have an R angle, the substrate layer is made of PET material, and the thickness is selected to be 125 μm. Specific Embodiment 2

[0044] Compared with Embodiment 1, in Embodiment 2, the apex is further fabricated in a form including an R angle, the radius of the R angle is selected to be 0.5 μm, and the remaining structure remains the same as that in Embodiment 1. Specific Embodiment 3

[0046] Compared with Embodiment 1, in Embodiment 3, the reverse prism layer is fabricated in the form of a prism group. Each prism group includes one wide prism and five narrow prisms. The bottom width of the wide prism is selected to be 30 μm, the bottom width of the narrow prism is selected to be 18 μm, and both the wide prism and the narrow prism are fabricated in a form including an R angle, the radius of the R angle is selected to be 0.5 μm, and the remaining structure remains the same as that in Embodiment 1.

[0047] Comparative Example 1

[0048] Compared with the first embodiment, in Comparative Example 1, the first bonding layer, the second bonding layer, and the third bonding layer are cancelled, and the respective layers are not integrated into a single diaphragm.

[0049] The shielding test, adsorption test, brightness ratio, and viewing angle measurement were carried out on each specific embodiment, and the results shown in Table 1 were obtained.

[0050] Table 1 Summary table of test results of each embodiment

[0051] Item Occlusivity Adsorptivity Cutting / Assembly Times Brightness Ratio (%) 1 / 3 Viewing Angle (°) Example 1 Excellent None 1 time / 1 time 103% 28° Example 2 Excellent None 1 time / 1 time 103% 28° Example 3 Excellent None 1 time / 1 time 104% 27.5° Comparative Example 1 General Slight 4 times / 4 times 100% 27°

[0052] Through the performance test comparison of each embodiment, the brightness ratios of the first to the third embodiments exceed 100%, and the results are better than those of Comparative Example 1. It can be seen that the technical solution of the present application has a high optical gain effect. In addition, the cutting and assembly times of the first to the third embodiments only need to be 1 time. During this process, the risk of adsorption of the backlight module is ensured to be zero, and the cutting and assembly efficiency is higher. In terms of shielding and adsorption properties, the first to the third embodiments have better performance, and the higher shielding performance has a good inhibitory effect on the process defects in actual applications.

[0053] As can be seen from the foregoing, the present application proposes a backlight module and a display device using the same, which improve the optical performance, structural stability, and durability of the backlight module. The backlight module integrally combines a reflective sheet, a first bonding layer, a microstructure light guide film, a second bonding layer, a reverse prism layer, a substrate layer, a third bonding layer, a polarizing functional layer, and a fogging layer from bottom to top. Each layer is tightly bonded by a high-precision optical transparent adhesive to form a single high-strength diaphragm structure.

[0054] The reflective sheet uses a high-reflectivity material to effectively recover light and reduce light loss; the microstructure light guide film adopts a unique micro-wedge structure and an arc groove light-emitting surface design. Through a precise refraction and scattering mechanism, it ensures uniform light distribution and reduces glare, significantly improving the picture brightness and uniformity. The reverse prism layer further improves the light directivity and utilization efficiency through precise control of the apex angle (60-70°) and R angle design (0-4μm), as well as an equal-width prism group layout (bottom width 10-50μm), while enhancing the mechanical strength and scratch and wear resistance of the backlight module. The light source is cleverly arranged on the side of the microstructure light guide film. Using the high-efficiency light guiding performance of the light guide film, the light is evenly propagated in the film and uniformly scattered on the light-emitting surface, optimizing the light distribution and utilization. The substrate layer selects PET, PC, or PMMA materials with high light transmittance, low haze, and excellent mechanical properties, ensuring a high light transmittance (>90%) and low haze (<1%) of the backlight module, while maintaining a reasonable thickness (25-250μm), taking into account both optical performance and economy.

[0055] In addition, the present application also provides a display device including the above backlight module. This device combines the backlight module with an advanced display panel, fully demonstrating the advantages of the backlight module in enhancing picture brightness, uniformity, color reproduction, and energy efficiency ratio.

[0056] The above is only a specific embodiment of the present application. Any improvement made on the premise of the concept of the present application is regarded as the protection scope of the present application.

Claims

1. A backlight module, characterized in that, It includes a reflective sheet (200), a first bonding layer (110), a microstructure light guide film (300), a second bonding layer (120), a reverse prism layer (400), a substrate layer (500), a third bonding layer (130), a polarizing functional layer (600), and an atomization layer (700) that are stacked in sequence from bottom to top; The reflective sheet (200) is bonded to the microstructure light guide film (300) through the first bonding layer (110), the microstructure light guide film (300) is bonded to the reverse prism layer (400) through the second bonding layer (120), and the polarizing functional layer (600) is bonded to the substrate layer (500) through the third bonding layer (130); The surface of the microstructure light guide film (300) in contact with the first bonding layer (110) is a wedge-shaped structure; The atomization layer (700) is formed on the surface of the polarizing functional layer (600) opposite to the third bonding layer (130); Among them, the reflective sheet (200), the first bonding layer (110), the microstructure light guide film (300), the second bonding layer (120), the reverse prism layer (400), the substrate layer (500), the third bonding layer (130), the polarizing functional layer (600), and the atomization layer (700) are integrated into a single film sheet.

2. The backlight module according to claim 1, wherein The material of the substrate layer (500) is PET, PC or PMMA. The thickness of the substrate layer (500) is in the range of 25 - 250 μm. The light transmittance of the substrate layer (500) is greater than 90%, and the haze of the substrate layer (500) is less than 1%.

3. The backlight module according to claim 1, wherein The apex angle of the reverse prism is in the range of 60 - 70°.

4. The backlight module according to claim 3, wherein The apex tip of the reverse prism is an R angle, and the radius of the R angle is in the range of 0 - 4 μm.

5. The backlight module according to claim 1, wherein Each prism in the reverse prism layer (400) has the same width, and the bottom width of the prism is in the range of 10 - 50 μm.

6. The backlight module according to claim 1, wherein, The prisms in the reverse prism layer (400) are formed by a plurality of prism groups. Each prism group includes a wide prism and two or more narrow prisms. The bottom width of the wide prism is in the range of 25 - 45 μm, and the bottom width of the narrow prism is 50 - 70% of the bottom width of the wide prism.

7. The backlight module according to claim 1, wherein The short side of the structure of the microstructure light guide film (300) is a plane or a circular arc surface.

8. The backlight module according to claim 7, wherein The light-emitting surface of the microstructure light guide film (300) is an arc groove structure. The groove opening spacing is in the range of 30 - 40 μm, and the arc radius is in the range of 20 - 25 μm.

9. The backlight module according to claim 1, wherein It further includes a light source, and the light source is arranged on the side of the microstructure light guide film (300).

10. A display device, characterized in that, It includes a display panel and a backlight module as described in any one of claims 1 - 9.

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