Backlight module and display device

Abstract

The utility model relates to a backlight module and a display device, the backlight module comprises a backlight unit and an optical film set arranged on one side of the backlight unit, the backlight unit comprises a substrate, a light-emitting part is fixed on the substrate, and a light-emitting part is fixed on the light-emitting part; the light guide plate is arranged on the substrate, and the light guide plate is arranged on the periphery of the light-emitting part; the shading reflecting film is arranged on the light guide plate and directly faces the light-emitting part so as to adjust the illumination intensity of the top of the light-emitting part; a coupling structure used for coupling and leading out light is formed in the light guide plate, and the coupling structure comprises a plurality of cavities. According to the backlight module and the display device, the light mixing distance between the light-emitting part and the optical film is reduced, and therefore the thickness of the backlight module and the thickness of the display device are reduced.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and more specifically, to a backlight module and display device. Background Technology

[0002] Liquid crystal display (LCD) technology has become the mainstream display technology due to its advantages such as low cost, low power consumption, and long lifespan. LCD panels do not emit light themselves; therefore, a backlight module is placed on the back of the LCD panel to illuminate it. Mini LED, as the next-generation backlight technology, has broad application prospects and a large market. Thanks to the localized control of Mini LED backlighting, compared to traditional LCD backlighting, LCDs using Mini LED backlighting technology perform better in dynamic contrast and brightness, and also offer advantages such as thinness, high image quality, low power consumption, and energy saving. Because traditional Mini LED backlight modules use direct-lit backlighting, sufficient light mixing distance is left between the LEDs and the optical films to avoid shadows and ensure normal image display. Therefore, Mini LED backlight modules are still relatively thick, unable to meet ultra-thin requirements. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a backlight module and display device that reduces the thickness of the backlight module and display device by decreasing the light mixing distance between the light-emitting element and the optical film.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A backlight module is designed, including a backlight unit and an optical film assembly disposed on one side of the backlight unit. The backlight unit includes: a substrate on which a light-emitting element is fixed; a light guide plate disposed on the substrate and surrounding the light-emitting element; and a light-shielding and reflective film disposed on the light guide plate, the light-shielding and reflective film facing the light-emitting element to adjust the light intensity at the top of the light-emitting element; a coupling structure for coupling and emitting light is formed inside the light guide plate, the coupling structure including multiple cavities, the light emitted by the light-emitting element enters the interior of the light guide plate, is scattered by the coupling structure, and exits from the front surface of the light guide plate into the optical film assembly.

[0006] In this design, Mini LEDs are used as the light-emitting elements, with multiple Mini LED arrays arranged on a substrate. The light guide plate consists of light guide components that correspond one-to-one with the light-emitting elements. These light guide components are made of rectangular transparent optical material, such as polymethyl methacrylate (PMMA). A lamp position hole is provided in the center of each light guide component as a clearance. The light-emitting elements are embedded within the lamp position holes of the light guide components, forming a surrounding structure. The inner wall of the lamp position hole serves as the light-incident surface of the light guide component, and the front surface of the light guide component serves as the light-emitting surface. Light emitted from the top of the light-emitting element is reflected by the reflective surface of the light-shielding reflective film and enters the light guide component from its light-incident surface. Light emitted from the side of the light-emitting element enters the light guide component from its light-incident surface. The surface of the light guide component is a total internal reflection surface, and the light undergoes multiple reflections within the light guide component, achieving efficient light mixing. By setting a coupling structure inside the light guide component, the total internal reflection condition is disrupted, causing diffuse reflection of the light within the light guide component, which then exits from its light-emitting surface. The above design improves the light mixing effect, makes the light distribution more uniform, reduces the light mixing distance, and eliminates the diffuser plate, thereby reducing the thickness of the backlight module.

[0007] Furthermore, the light-shielding reflective film has light-transmitting holes, which are arranged around the periphery of the light-emitting element.

[0008] By adjusting the light-emitting area at the top of the light-emitting component using a light-shielding reflective film, and considering the low light transmittance of the film, a small amount of light can be transmitted through the outer area of ​​the light-emitting component by opening a light-transmitting hole at its top, thereby reducing high light intensity and achieving uniform light distribution.

[0009] Furthermore, the coupling structure is a cavity coupling pattern surrounding the light-emitting element, and it is a symmetrical structure.

[0010] The coupling structure is located inside the light guide, and both the front and back surfaces of the light guide can serve as light-emitting surfaces. Therefore, when attaching the light guide to the substrate, there is no need to consider the front and back sides, which reduces the difficulty of the process. The coupling structure can be a cavity coupling pattern structure engraved inside the light guide using laser engraving technology. The laser focal point has high energy and can process the interior of the transparent light guide material in a vacuum, destroying the crystal structure of the light guide and forming several cavities within a certain height range inside its structure, thus forming a cavity coupling pattern. At the same time, the coupling structure is a symmetrical structure with the axis parallel to the light-emitting surface of the light guide as the axis of symmetry, which enables the light emitted from the light-emitting surface of the light guide to be evenly distributed, forming a near-uniform surface light source.

[0011] Furthermore, the cavity coupling pattern includes one or more combinations of dot matrix patterns, linear matrix patterns, or planar patterns.

[0012] A cavity coupling pattern is composed of several cavities and can be one or more combinations of dot matrix patterns, linear array patterns, or planar patterns. The denser the cavity coupling pattern, the stronger the light intensity and the higher the brightness. Specific cavity coupling patterns can be designed according to actual needs.

[0013] Furthermore, the dot matrix pattern, line matrix pattern, and planar pattern are all located within a preset thickness range of the light guide plate.

[0014] The coupling patterns engraved inside the light guide are all located within the same height range, which can ensure uniform light output and prevent the light loss caused by light mixing inside the light guide.

[0015] Furthermore, the cavity density of the cavity coupling pattern is greater in the region away from the light-emitting element than in the region close to the light-emitting element.

[0016] Light loss occurs when light is reflected within the light guide. The further the light guide is from the light source, the more significant the light loss and the lower the brightness. Therefore, in order to make the light emitted from the light guide surface uniform, the cavity density in the cavity coupling pattern far from the light source is greater than the cavity density in the area close to the light source. This allows more light to be emitted from the light guide surface in the area far from the light source, thereby increasing the brightness.

[0017] Furthermore, a filler is provided between the light guide and the light-emitting element, the filler being used to reduce the difference in refractive index between the light-emitting surface and the incident surface of the medium.

[0018] Optical silicone can be used as the filler. Optical silicone has good stability and elasticity, and a low coefficient of thermal expansion, which can mitigate damage to the light-emitting component during thermal expansion and contraction. The optical silicone fills the space between the light-emitting component and completely fills the lamp position hole. On the one hand, it can adhere and fix the light-shielding reflective film; on the other hand, it can reduce the difference in refractive index between the light-emitting surface of the light-emitting component and the light-incident surface of the light guide, reducing interface losses. The complete coverage of the light-emitting component with optical silicone protects the phosphor on its surface, improving the phosphor's resistance to moisture.

[0019] Furthermore, a reflective layer is provided on the surface of the substrate that is in contact with the light-emitting element.

[0020] To increase the reflectivity of the substrate surface and improve the utilization rate of the light emitted by the light-emitting component, a high-reflectivity PET reflective film can be attached to the surface of the substrate, or a white ink can be sprayed onto the substrate surface as a reflective layer.

[0021] Furthermore, a gap is provided between adjacent light guides.

[0022] The adjacent light guides are not bonded together, and there is a certain gap between them. The refractive index difference between the light guide material and air is large, so the light-locking ability of the interface is strong, which can reduce the cross-lighting effect between adjacent backlight units and thus effectively control the backlight halo.

[0023] Furthermore, a display device is designed, including the aforementioned backlight module.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] In this design, Mini LEDs are used as the light-emitting elements, with multiple Mini LED arrays arranged on a substrate. The light guide plate consists of light guide components that correspond one-to-one with the light-emitting elements. These light guide components are made of rectangular transparent optical material, such as polymethyl methacrylate (PMMA). A lamp position hole is provided in the center of each light guide component as a clearance. The light-emitting elements are embedded within the lamp position holes of the light guide components, forming a surrounding structure. The inner wall of the lamp position hole serves as the light-incident surface of the light guide component, and the front surface of the light guide component serves as the light-emitting surface. Light emitted from the top of the light-emitting element is reflected by the reflective surface of the light-shielding reflective film and enters the light guide component from its light-incident surface. Light emitted from the side of the light-emitting element enters the light guide component from its light-incident surface. The surface of the light guide component is a total internal reflection surface, and the light undergoes multiple reflections within the light guide component, achieving efficient light mixing. By setting a coupling structure inside the light guide component, the total internal reflection condition is disrupted, causing diffuse reflection of the light within the light guide component, which then exits from its light-emitting surface. The above design improves the light mixing effect, makes the light distribution more uniform, reduces the light mixing distance, and eliminates the diffuser plate, thereby reducing the thickness of the backlight module. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the backlight module according to an embodiment of the present invention.

[0027] Figure 2 This is a partial view of the front of the backlight unit according to an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the partitioned backlight unit according to an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the light path emitted by the light-emitting element in an embodiment of this utility model.

[0030] Figure 5 This is a top view of the light-shielding and reflective film according to an embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of the structure of the light guide component according to an embodiment of the present utility model. Figure 1 .

[0032] Figure 7This is a schematic diagram of the structure of the light guide component according to an embodiment of the present utility model. Figure 2 .

[0033] Explanation of icon numbers:

[0034] Illustrations: 1. Backlight unit; 2. Optical film assembly; 11. Substrate; 111. Reflective layer; 12. Light guide plate; 121. Light guide component; 122. Coupling structure; 123. Filler; 124. Gap; 1211. Lamp hole; 1212. Light incident surface; 1213. Light emitting surface; 1221. Cavity; 13. Light emitting component; 14. Light-shielding reflective film; 141. Light-transmitting hole. Detailed Implementation

[0035] To facilitate understanding of this invention, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0036] For ease of understanding, we define the backlight module as emitting light in the forward direction.

[0037] like Figure 1 As shown, this embodiment provides a backlight module, including a backlight unit 1 and an optical film group 2 disposed in front of the backlight unit 1. The backlight unit 1 includes:

[0038] The substrate 11 contains a power supply circuit. The specific type of the substrate 11 is not limited; it can be a rigid PCB or a flexible FPC. Several light-emitting elements 13 are arrayed on the substrate 11, and the light-emitting elements 13 are electrically connected to the power supply circuit in the substrate 11. The light-emitting elements 13 are Mini LEDs. Preferably, Mini LEDs with multiple light-emitting surfaces are used, such as five-sided light-emitting Mini LEDs. They are white LEDs or blue chip-grade LEDs packaged in NCSP or CSP.

[0039] A light guide plate 12 is disposed on the front side of the substrate 11, and a clearance is formed in the position of the light guide plate 12 directly opposite the light-emitting element 13;

[0040] And a light-shielding reflective film 14 is attached to the light guide plate 12. The light-shielding reflective film 14 faces the light-emitting element 13 and adjusts the light intensity of the light-emitting area at the top of the light-emitting element 13 through the light-shielding reflective film 14.

[0041] In order to increase the reflectivity of the front surface of the substrate 11 and improve the utilization rate of the light emitted by the light-emitting element 13, a reflective layer 111 is provided on the front surface of the substrate 11. The reflective layer 111 can be a high-reflectivity PET reflective film, or it can be a reflective layer 111 made by spraying white ink on the substrate surface.

[0042] likeFigure 1 and 2 As shown, the light guide plate 12 is composed of several light guides 121 that correspond one-to-one with the light-emitting elements 13. The light guides 121 are made of transparent optical materials, such as polymethyl methacrylate (PMMA). The thickness and shape of the light guides 121 are matched according to the LED selection. The thickness of the light guides 121 can be ≤1.1mm. The light guides 121 are thin plates with regular shapes, such as triangles, quadrilaterals, pentagons, etc. In this embodiment, the light guides 121 are rectangular thin plates. The independent light guides 121, the light-emitting elements 13 and the light-shielding reflective film 14 form a partitioned backlight unit, which is the smallest partitioned dimming unit that can control the brightness of the light-emitting elements 13 individually for dimming.

[0043] like Figures 2 to 4 As shown, a through-hole 1211 is provided in the middle of the light guide 121 as a clearance. Viewed from the front of the backlight module, the light-emitting element 13 is embedded in the lamp hole 1211. The light guide 121 surrounds the light-emitting element 13, so the sidewall of the lamp hole 1211 is the light-incident surface 1212, and the front surface of the light guide 121 is the light-emitting surface 1213. The thickness of the light guide 121 is not less than the height of the light-emitting element 13, so that the light-emitting element 13 is completely embedded in the lamp hole 1211, thereby avoiding contact between the optical film assembly 2 and the light-emitting element 13. The front and rear surfaces of the light guide 121 are both smooth surfaces, and a coupling structure 122 for coupling and emitting light is formed inside it. The coupling structure 122 includes multiple cavities 1221. The light emitted by the light-emitting element 13 enters the interior of the light guide 121, is scattered by the coupling structure 122, and is emitted from the surface of the light guide 121 into the optical film group 2.

[0044] like Figure 3 and Figure 5 As shown, the light-shielding reflective film 14 is attached to the light-emitting surface 1213 of the light guide 121. Its size can be slightly larger than the lamp hole 1211. It can close the front opening of the lamp hole 1211, but will not cover a large portion of the light-emitting surface 1213. The light-shielding reflective film 14 can be a circular or square PET reflective film with a reflectivity of over 90%. Its center coincides with the center of the light-emitting element 13. The light-shielding reflective film 14 has a light-transmitting hole 141. The light-transmitting hole 141 can include multiple round holes and strip holes. When viewed from a direction perpendicular to the light-shielding reflective film 14, the light-transmitting hole 141 surrounds the periphery of the light-emitting element 13. The light transmittance of the light-shielding reflective film 14 is less than 10%. By opening the light-transmitting hole 141 at its top, a small amount of light can pass through the outer area of ​​the light-emitting element 13, thereby reducing high light intensity and achieving uniform light distribution. In this embodiment, the size of the light-shielding reflective film 14 and the arrangement of the light-transmitting holes 141 are designed to match the LED selection, and the thickness of the light-shielding reflective film 14 is ≤0.1mm.

[0045] like Figure 4As shown, some of the light emitted from the top of the light-emitting element 13 is reflected by the light-shielding reflective film 14 and enters the light guide 121 through the light-incident surface 1212. A portion of the light exits through the light-transmitting hole 141. Light emitted from the side of the light-emitting element 13 enters the light guide 121 through the light-incident surface 1212. The inner surface of the light guide 121 is a total internal reflection surface, and the light undergoes multiple reflections within the light guide 121, achieving efficient light mixing. By setting a coupling structure 122 inside the light guide 121, the total internal reflection condition of the light guide 121 is disrupted, causing the light to be scattered by the coupling structure 122 and exit from the light-exit surface 1213 of the light guide 121. The above design improves the light mixing effect, makes the light distribution more uniform, and reduces the light mixing distance. The sum of the thickness of the light guide 121 and the thickness of the light-shielding reflective film 14 is ≤1.2mm. The optical film group 2 is attached to the light-shielding reflective film 14, so the light mixing distance can be ≤1.2mm. At the same time, the diffuser plate is eliminated, thereby reducing the thickness of the backlight module.

[0046] The independent light guides 121 are small in size and numerous, making their assembly on the substrate 11 complex. Therefore, the substrate can be cut into sections using laser subtractive cutting, and then the entire board of light guides 121 can be transferred onto the substrate 11 by a transfer plate. Alternatively, they can be molded and then transferred by the transfer plate. The transferred light guides 121 are accurately attached to their corresponding sections, primarily using silicone adhesive for fixation. In this embodiment, the thickness of the light guide 121 is ≤1.1mm, and its size is ≤12*12mm. A certain gap 124 is provided between adjacent light guides 121, preventing them from being directly bonded. The significant difference in refractive index between the light guide material and air results in strong light-locking ability at the interface, reducing cross-light interference between adjacent backlight units and effectively controlling backlight halo. Furthermore, the sidewalls of the light guides 121 can be coated with a high-reflectivity material, such as white polyethylene glycol terephthalate, which can also isolate light and further reduce cross-light interference between adjacent backlight units.

[0047] like Figure 6 and Figure 7As shown, in this embodiment, the coupling structure 122 is a cavity coupling pattern engraved inside the light guide 121 using laser engraving technology. The laser focal point has high energy, which can process the interior of the transparent light guide 121 material in a vacuum, destroying the crystal structure of the light guide 121 and forming multiple cavities 1221 within a certain height range (thickness range) inside its structure, thus constituting the cavity coupling pattern. Viewed from the front side of the light guide 121 (perpendicular to the front surface of the light guide), the cavity coupling pattern can be a lattice pattern (including multiple tiny spherical or near-spherical, or cylindrical, cuboid, or cubic cavities 1221 with similar height and diameter), a linear array pattern (including multiple strip-shaped or slender columnar cavities 1221), or a planar pattern (including multiple larger cavities 1221 with specific shapes and heights, such as...). Figure 6 The cavity coupling pattern consists of one or more of four large cavities resembling flower petals. A denser cavity coupling pattern results in stronger light intensity and higher brightness. Specific cavity coupling patterns can be designed to meet specific needs. Light reflection within the light guide 121 causes light loss, which is more pronounced and results in lower brightness in areas farther from the light source 13. Therefore, to ensure uniform light emission from the light-emitting surface 1213 of the light guide 121, the density of cavities 1221 in the cavity coupling pattern farther from the light source is greater than that in the area closer to the light source. This allows more light to be emitted from the light-emitting surface 1213 in areas farther from the light source 13, thus increasing brightness. In this embodiment, the light guides 121 are all rectangular thin plates, and the light-emitting element 13 is located at the center of the thin plate. The areas at the four corners of the light guide 121 are farthest from the light-emitting element 13, and the greater the light loss, the dark areas will be formed in the four corner areas. Therefore, the cavity coupling pattern closer to the four corner areas has a greater cavity density 1221. The cavity coupling pattern in the four corner areas can be additionally set with a dot matrix pattern to increase the density of the cavity 1221. In addition, in this embodiment, the peripheral wall of the lamp position hole 1211 forms a cubic hole, and the four corners of the lamp position hole 1211 are directly opposite the center of the four sides of the light guide 121. In order to prevent the brightness of the four corners of the light guide 121 from being relatively large, no coupling structure 122 is set near the center of the four sides of the light guide 121. Figure 7 In the embodiment shown, a coupling structure 122 with a linear array pattern is formed on both sides of the uncoupled structure formed near the center of the four sides of the light guide 121.

[0048] The cavity coupling pattern is set inside the light guide 121. Both the front and rear surfaces of the light guide 121 can serve as light-emitting surfaces 1213. Therefore, when attaching the light guide 121 to the substrate 11, there is no need to consider the front and back sides, which reduces the difficulty of the process. At the same time, the cavity coupling pattern is an axisymmetric pattern with the axis parallel to the light-emitting surface 1213 of the light guide 121 (preferably two mutually perpendicular axes that are parallel to the front surface of the light guide) as the axis of symmetry. This ensures that the light emitted from the light-emitting surface 1213 of the light guide 121 is evenly distributed, forming a near-uniform surface light source. The cavity coupling pattern engraved inside the light guide 121 is located within a certain height range of the light guide 121, which ensures uniform light output without causing light loss due to light mixing inside the light guide 121.

[0049] like Figure 3 As shown, in this embodiment, a filler 123 is used to fill the space between the light-emitting element 13 and the lamp position hole 1211. The filler 123 can be optical silicone. Optical silicone has good stability and elasticity, and a low thermal expansion coefficient, which can mitigate damage to the light-emitting element during thermal expansion and contraction. The optical silicone completely fills the lamp position hole 1211. On the one hand, the optical silicone can adhere and fix the light-shielding reflective film 14. On the other hand, the optical silicone can reduce the difference in refractive index between the light-emitting surface of the light-emitting element 13 and the light-incident surface 1212 of the light guide element 121, reducing interface loss. The optical silicone completely covers the light-emitting element 13, which can protect the phosphor on the surface of the light-emitting element 13 and improve the phosphor's resistance to moisture. In addition, if the light-emitting element 13 is a QD-LED, because the QD material has low resistance to moisture and heat, it cannot be widely used in ordinary LED applications. By completely covering and isolating moisture with optical silicone, the problem of low resistance to moisture of QD material can be solved. By making the LED chip flip-chip, the heat dissipation capacity of the substrate 11 pads is increased, and the LED temperature is controlled to maintain a stable state. As the stability of QD material improves, the technical difficulties of QD-LED light-emitting element application can be solved.

[0050] In this embodiment, an optical film group 2 is disposed above the backlight unit 1 to modulate light emission. The optical film group 2 may include a light-diffusing film, a diffuser film, a prism film, and a brightness enhancement film. If a QD Mini LED solution is adopted, the QD film can be placed directly above the light guide plate 12 or with one diffuser film in between. The design of the optical film group 2 is all existing technology and will not be described in detail here. The overall thickness of the backlight module in this embodiment can be ≤5.5mm.

[0051] This embodiment also provides a display device, including the aforementioned backlight module and a display panel disposed on the light-emitting side of the backlight module. The display device can be any product or component with display functionality, such as a vehicle screen, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0052] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A backlight module, comprising a backlight unit and an optical film assembly disposed on one side of the backlight unit, characterized in that, The backlight unit includes: A substrate on which a light-emitting element is fixed; A light guide plate disposed on a substrate, the light guide plate being positioned around the light-emitting element; and A light-shielding and reflective film is disposed on the light guide plate, with the light-shielding and reflective film facing the light-emitting element, so as to adjust the light intensity on the top of the light-emitting element; The light guide plate has a coupling structure inside for coupling out light. The coupling structure includes multiple cavities. The light emitted by the light-emitting element enters the interior of the light guide plate, is scattered by the coupling structure, and then exits from the front surface of the light guide plate into the optical film assembly.

2. The backlight module according to claim 1, characterized in that, The light-shielding reflective film has light-transmitting holes, which are arranged around the periphery of the light-emitting element.

3. The backlight module according to claim 1, characterized in that, The coupling structure is a cavity coupling pattern surrounding the light-emitting element, and it is a symmetrical structure.

4. The backlight module according to claim 3, characterized in that, The cavity coupling pattern includes one or more combinations of dot matrix patterns, linear matrix patterns, or planar patterns.

5. The backlight module according to claim 4, characterized in that, The dot matrix pattern, line matrix pattern, and planar pattern are all located within the preset thickness range of the light guide plate.

6. The backlight module according to claim 5, characterized in that, The cavity density of the cavity coupling pattern is greater in the region away from the light-emitting element than in the region close to the light-emitting element.

7. The backlight module according to claim 1, characterized in that, A filler is provided between the light guide and the light-emitting element. The filler is used to reduce the difference in refractive index between the light-emitting surface and the incident surface of the medium.

8. The backlight module according to claim 1, characterized in that, The substrate has a reflective layer on the surface where it is attached to the light-emitting element.

9. The backlight module according to claim 1, characterized in that, A gap is provided between adjacent light guides.

10. A display device, characterized in that, Includes the backlight module as described in any one of claims 1-9.

Images