Backlight module and display device

Abstract

The invention provides a backlight module and a display device.The backlight module comprises a diffusion plate, a lamp panel and a back plate, the diffusion plate comprises a diffusion structure and a plurality of supporting structures, the diffusion structure between every two adjacent supporting structures corresponds to one light subarea, the supporting structures are made of light-transmitting materials, light in the light subareas can enter the supporting structures, and the light in the light subareas can enter the supporting structures; the emergent light intensity of the position where the supporting structure is located is improved, the emergent light brightness uniformity of the backlight module is improved, the haze of the diffusion structure is larger than zero, the lamp panel is located on the light inlet side of the diffusion plate and makes contact with the supporting structure, the lamp panel comprises a plurality of light-emitting elements, and the light-emitting elements are arranged in a plurality of light partitions respectively. The back plate is located on the side, away from the diffusion plate, of the lamp panel. In this way, the uniformity of light entering the diffusion plate can be improved through the diffusion effect of the diffusion plate, the supporting structure is used for supporting the diffusion structure, the distance between the diffusion structure and the lamp panel is kept, the light emitting brightness uniformity of the backlight module is improved, and the display quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] With the development of display technology, flat display devices such as liquid crystal display panels (LCD) have been widely used in various electronic products such as mobile phones, cars, televisions, digital cameras, laptops, etc. due to their advantages such as high quality, power saving and wide application range, becoming the mainstream of display devices.

[0003] Since the liquid crystal display panel itself does not emit light, the liquid crystal display panel needs to be used in conjunction with a backlight module. The current backlight module has the problem of uneven light brightness at different positions. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a backlight module and a display device to improve the uniformity of the light output brightness of the backlight module.

[0005] The embodiment of the present application provides a backlight module, including:

[0006] A diffusion plate, the diffusion plate comprising a diffusion structure and a plurality of supporting structures, the diffusion structure between adjacent supporting structures corresponds to a light partition, the supporting structure is made of a light-transmitting material, and the haze of the diffusion structure is greater than zero;

[0007] A light board, the light board is located on the light incident side of the diffuser plate and is in contact with the support structure; the light board includes a plurality of light emitting elements, and the plurality of light emitting elements are respectively arranged in a plurality of light partitions;

[0008] The back plate is located on a side of the light plate away from the diffusion plate.

[0009] An embodiment of the present application provides a display device, comprising the backlight module described in the above embodiment.

[0010] The embodiment of the present application provides a backlight module and a display device, the backlight module includes a diffusion plate, a light board and a back plate, the diffusion plate includes a diffusion structure and a plurality of supporting structures, the diffusion structure between adjacent supporting structures corresponds to a light partition, the supporting structure is a light-transmitting material, so that the light in the light partition can enter the supporting structure, the outgoing light intensity at the position where the supporting structure is located is improved, which is conducive to improving the uniformity of the light output brightness of the backlight module, the haze of the diffusion structure is greater than zero, the light board is located on the light incident side of the diffusion plate and in contact with the supporting structure, the light board includes a plurality of light-emitting elements, and the plurality of light-emitting elements are respectively arranged in a plurality of light partitions, and the back plate is located on the side of the light board away from the diffusion plate. In this way, the light entering the diffusion plate can be diffused by the diffusion plate to improve the uniformity, and the supporting structure is used to support the diffusion structure, maintain the distance between the diffusion structure and the light board, avoid the diffusion structure from warping and deformation and collapse toward the light board, improve the uniformity of the light output brightness of the backlight module, avoid the display device from having grid patterns, lamp shadows and other poor display problems, and improve the display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 This is a schematic diagram of the structure of a backlight module in an embodiment of the present application;

[0013] Figure 2A A schematic top view of a support structure provided in an embodiment of the present application;

[0014] Figure 2B A structural schematic diagram of a support structure provided in an embodiment of the present application;

[0015] Figure 3A-Figure 3F A schematic diagram of the display effect provided by an embodiment of the present application;

[0016] Figure 4A-4H A schematic diagram of simulation results provided for an embodiment of the present application;

[0017] Figure 5 is a structural schematic diagram of a display device provided in an embodiment of the present application;

[0018] Figure 6 A schematic diagram of a means of transportation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0021] Secondly, the present application is described in detail with reference to the schematic diagram. When describing the embodiments of the present application in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present application. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0022] In order to better understand the technical solution and technical effects of the present application, specific embodiments will be described in detail below with reference to the accompanying drawings.

[0023] refer to Figure 1 As shown, it is a structural schematic diagram of a backlight module provided by an embodiment of the present application. The backlight module 10 includes a diffusion plate 13, a lamp board 12 and a back plate 11. The display panel can be stacked with the backlight module, that is, the backlight module 10 is a direct-type backlight module. The backlight module is arranged behind the display panel and the lamp board is configured as a light source so that the light source can be evenly transmitted to the entire display panel, making the picture details more delicate and realistic. The light emitting direction of the backlight module is the z direction.

[0024] The back plate 11 is used to carry components and can be arranged in a cavity or a substrate. The back plate 11 arranged in the cavity has an additional connection portion extending upward compared to the back plate 11 arranged in the substrate, which is used to protect the light board 12 and the diffuser, etc. The material of the back plate can be a metal material or a non-metal material. The metal material is, for example, electrolytic galvanized cold rolled sheet (SECC) or aluminum (Al).

[0025] The light board 12 includes a plurality of light-emitting elements 121, and the light-emitting elements 121 may be light-emitting diode (LED) chips, such as Mini-LED chips or Micro-LED chips. Each light-emitting element 121 may be controlled individually to ensure a delicate display image. Each light-emitting element 121 may correspond to a plurality of pixels of the display panel and be used to provide backlight for the plurality of pixels. The plurality of light-emitting elements 121 may be arranged on a driving substrate, and the driving substrate is used to provide a driving signal for the light-emitting elements 121. The light board 12 may also include a lens on the light-emitting element 121, which is used to diverge the light emitted by the light-emitting element 121.

[0026] The light emitting element 121 may include a white light LED to reduce the production cost of the display module including the backlight module, or may include a blue light LED to solve the problem of yellowing of the image around the display module, and provide a better display effect. The light emitting element 121 may be a top-emitting LED, which emits light toward the diffuser 13. Its light emission characteristics are usually strong at small angles and relatively weak at large angles. Figure 1 The direction of light propagation is represented by a straight line with an arrow, and the thickness of the straight line represents the intensity of light. The light emitting element 121 can be divided into a plurality of independently controlled blocks, each of which can independently adjust the brightness according to the requirements of the displayed content to achieve local dimming, thereby improving the contrast and image quality of the picture.

[0027] The light board 12 is fixedly arranged on the back plate 11. For example, the light board 12 and the back plate 11 can be fixed by using a thermal conductive tape. On the one hand, the light board 12 can be fixed well on the back plate 11. On the other hand, the heat generated by the light board 12 can be conducted through the metal back plate 11 to achieve a better heat dissipation effect. Of course, in other methods provided in the embodiments of the present invention, other fixing methods can be used between the light board 12 and the back plate 11, for example, direct bonding by ordinary glue, or mechanical fixing.

[0028] The diffuser 13 is located on the light board 12, that is, the backboard 11 is located on the side of the light board 12 away from the diffuser 13. The diffuser 13 includes a diffuser structure 131 and a plurality of support structures 132. The diffuser structure 131 between adjacent support structures 132 corresponds to a light partition, and the light partition includes a cavity structure separated by the support structure 132 and the diffuser structure 131. The plurality of light-emitting elements 121 are respectively arranged in the plurality of light partitions, and the support structure 132 is located between two adjacent light partitions, and is used to physically isolate the light partitions, but does not completely isolate the transmission of light.

[0029] The lamp board 12 is located on the light incident side of the diffuser plate 13 and is in contact with the support structure 132, so that the distance between the diffuser structure 131 and the lamp board 12 is maintained by the support structure 132, especially the distance between the middle part of the diffuser structure 131 and the lamp board 12, to prevent the light-emitting element 121 on the lamp board 12 from contacting the diffuser structure 131, to avoid the diffuser structure 131 from warping and collapsing toward the lamp board 12, and to further prevent the optical distance (Optical Distance) between the lamp board 12 and the diffuser structure 131 from being reduced to cause abnormal reticulation. The optical distance is also called the mixing distance. Generally speaking, the larger the mixing distance, the more uniform the display of the backlight module. Therefore, the existence of the support structure 132 can improve the uniformity of the light output brightness of the backlight module, improve product reliability, reduce poor display caused by deformation, avoid display problems such as grid patterns and lamp shadows in the display device, and improve the optical quality of the display.

[0030] The supporting substructure between two adjacent light partitions can be arranged in a strip shape, refer to Figure 2A As shown, it is a top view schematic diagram of a support structure in an embodiment of the present application. In a plane parallel to the surface of the back panel (a plane determined by the x-direction and the y-direction), the support structure includes a plurality of support substructures. When the light partitions are arranged in an array, the plurality of support substructures can contact each other to form a complete mesh structure, as the support structure 132, the support substructures in the mesh structure provide support to each other, so that the support structure 132 has a high mechanical stability. The line connecting the center points of two adjacent light partitions is taken as the first direction (x-direction or y-direction), then the support substructure between the two adjacent light partitions extends in a direction perpendicular to the first direction, and the length is equal to the size of the light partition. The size of the support substructure between the two adjacent light partitions in the first direction is taken as the width, and the width can be determined according to actual conditions. The size of the support substructure in the light emitting direction is taken as the height. In addition, the plurality of support substructures can also be independent of each other, that is, the size of the support substructure in the direction perpendicular to the first direction is smaller than the size of the light partition.

[0031] The area of ​​the part where the support structure 132 and the diffusion structure 131 are in contact can be equal to the contact area between the support structure 132 and the lamp board 12, or it can be larger than the contact area between the support structure 132 and the lamp board 12, thereby improving the supporting effect of the support structure 132 on the diffusion structure 131, and reducing the base area of ​​the lamp board 12 to prevent interference with the light-emitting element 121.

[0032] The haze of the diffusion structure 131 is greater than zero, so that the light entering the diffusion plate 13 can be diffused by the diffusion plate 13 to improve uniformity. The diffusion effect is specifically diffuse reflection or refraction, so that the light is reflected back in the diffusion plate 13 to improve the uniformity of the light. The greater the haze of the diffusion structure 131, the more obvious the diffusion effect on the light, the higher the uniformity of the emitted light, and the lower the brightness of the corresponding emitted light. Therefore, the haze of the diffusion structure 131 can be set according to actual needs. The haze of the diffusion structure 131 is determined according to the material and surface treatment technology of the diffusion structure 131.

[0033] The support structure 132 is made of a light-transmitting material, so that the light in the light partition can enter the support structure, and the outgoing light intensity at the location of the support structure is improved, which is beneficial to improving the uniformity of the outgoing light brightness of the backlight module.

[0034] The support structure 132 may include a first substrate, the light transmittance of the first substrate is greater than 30% and less than 99%, so that the support structure 132 is a diffuse material or a transparent material. The greater the light transmittance of the first substrate, the more light from one light partition to another light partition is transmitted through the support structure 132. On the contrary, the smaller the light transmittance of the first substrate, the less light from one light partition to another light partition is transmitted through the support structure 132. In the embodiment of the present application, the support structure 132 is set to have a certain degree of transparency but not completely transparent, so that the light entering the support structure 132 produces a certain diffuse reflection effect instead of being completely transmitted, which is conducive to exporting the light to the display panel thereon, improving the brightness of the support structure 132, and helping to improve the light uniformity of the backlight module. Specifically, the light can propagate in the support structure 132 through the principle of total reflection, and finally be emitted from the light emitting side of the support structure 132, avoiding local display defects at the position of the support structure 132.

[0035] When the transmittance of the supporting structure 132 is low, according to the principle of total reflection, after the light of one light partition enters the supporting structure 132, it is not easy to emit to the air layer of the adjacent light partition. The light propagates inside the supporting structure 132 and finally emits from the light emitting surface, which is conducive to solving the light leakage problem between the light partitions, thereby blocking different light partitions, reducing the light crosstalk between different light partitions, and improving the overall uniformity of the product and the single-partition contrast of the local dimming backlight display technology product.

[0036] Of course, the transmittance of the support structure 132 can be adjusted according to project needs. If the project does not have high requirements on the contrast of a single partition, but has extremely high requirements on the picture quality and reliability, the transmittance of the support structure 132 can be set to a higher level. In this way, the picture quality can be further improved while ensuring reliability.

[0037] The haze of the support structure 132 can be greater than 70%, so that the light entering the support structure 132 can be emitted through the diffusion effect of the support structure 132, thereby improving the brightness of the support structure 132, avoiding insufficient light in the local area due to the long distance from the light-emitting element 121 and the non-direct setting, avoiding partial shadows on the overall screen, reducing grid patterns and other undesirable display effects, and improving the uniformity of light. Figure 1 As shown, the light is emitted uniformly after passing through the support structure 132. The haze and light transmittance of the support structure 132 are determined according to the material of the support structure 132 and the surface treatment technology.

[0038] The support structure 132 may include only the first substrate, and the material setting of the first substrate enables it to meet the aforementioned light transmittance requirements and haze requirements; the support structure 132 may also include the first substrate and particles distributed in the first substrate, and the particles have a certain light diffusion effect, so that the support structure 132 has the aforementioned light transmittance and haze. When other parameters are the same, the higher the particle concentration, the lower the light transmittance of the support structure 132 and the higher the haze. The material of the first substrate may be at least one of polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET) and polyvinyl chloride (PVC) resin.

[0039] refer to Figure 2B As shown, it is a structural schematic diagram of a support structure provided in an embodiment of the present application. The large-angle light generated by the light-emitting element 121 enters the support structure 132. The support structure 132 has particles 13A. When the incident light is transmitted to the support structure 132, refracted light is obtained. The refracted light can be converted into partial refracted light and partial front-emitting light through the diffusion effect of the particles (such as reflection and refraction). The front-emitting light is emitted from the light-emitting side of the support structure. The partial refracted light can be further converted into partial front-emitting light through the diffusion effect of other particles.

[0040] Specifically, the particles in the first matrix can diffusely reflect light, so that the light entering the support structure 132 is diffused. The particles can be evenly distributed in the first matrix, that is, the density is uniform. The higher the particle concentration, the thicker the support structure, and the weaker the outgoing light.

[0041] The diffusion structure 131 may include a second matrix, or may include a second matrix and particles distributed in the second matrix, so that the haze of the diffusion structure 131 meets the haze requirements, and the light incident on the diffusion structure 131 is diffused to improve uniformity. When other parameters are the same, the higher the particle concentration, the lower the light transmittance of the support structure 132 and the higher the haze. The material of the second matrix may be at least one of polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET) and polyvinyl chloride (PVC) resin. The haze of the diffusion structure 131 is greater than 70%, so that the diffusion structure 131 can provide sufficient diffusion.

[0042] The particle concentration in the first matrix and the particle concentration in the second matrix can be the same or different, and can be adjusted according to actual conditions. For example, if the project has high requirements for the contrast of a single partition, the particle concentration in the support structure can be set to be greater than the particle concentration in the diffusion structure, that is, the particle concentration of the first matrix is ​​greater than the particle concentration of the second matrix, to ensure that the support structure 132 diffuses light and makes the single partition contrast of the display module higher; if the project does not have high requirements for the contrast of a single partition, but has extremely high requirements for the picture quality and reliability, the particle concentration in the support structure can be set to be less than the particle concentration in the diffusion structure, that is, the particle concentration of the first matrix is ​​less than the particle concentration of the second matrix, to ensure that the support structure 132 has good light transmittance, which is conducive to improving the picture quality; if the project has moderate requirements for the contrast and picture quality of a single partition, the particle concentration in the support structure can be set to be equal to the particle concentration in the diffusion structure, that is, the particle concentration of the first matrix is ​​equal to the particle concentration of the second matrix, to simplify the manufacturing process while meeting the requirements. In actual operation, the support structure 132 can be a translucent material or a diffusion material, and the diffusion structure 131 is a diffusion material. If the particle concentration of the diffusion structure 131 is low, it may lead to poor diffusion effect and affect the visual effect. Therefore, the particle concentration in the diffusion structure 131 can be set to be greater than or equal to the particle concentration in the support structure 132.

[0043] The diffusion structure 131 and the support structure 132 may be an integral structure, so that the diffusion plate formed by the two has a high mechanical strength. The support structure 132 is in a strip-shaped structure on the diffusion structure 131 and is distributed in an array, which is convenient for alignment with the light board 12. When the diffusion structure 131 and the support structure 132 have the same base material (that is, the material of the first base and the second base is the same), and have the same particles and particle concentrations, the integral structure of the diffusion structure 131 and the support structure 132 can be formed by a one-time molding process, and the molding process can be an in-mold injection molding process (IML). If the diffusion structure 131 and the support structure 132 have different base materials (that is, the materials of the first base and the second base are different), or have different ions or different particle concentrations, the integral structure of the diffusion structure 131 and the support structure 132 can be obtained by a secondary molding process, and the molding process can be an IML process.

[0044] refer to Figure 3A-Figure 3F FIG. 1 is a schematic diagram of the display effect corresponding to the backlight module provided in the embodiment of the present application, wherein Figure 3A-3B The figure shows the display performance of a backlight module without a supporting structure. Figure 3C-Figure 3D The display performance of the backlight module with a support structure made of reflective material is shown in Figure 1, which is reflected in the white support structure. Figure 3E-Figure 3F The figure shows the display performance of a backlight module whose supporting structure is made of light-transmitting material. Figure 3A , Figure 3C and Figure 3E is the size of the halo generated by the backlight unit (BLU) in the horizontal direction, recorded as BLU Halo Size (Horizontal). The ordinate is the brightness percentage, which is the ratio of the brightness to the brightness of the halo center point. The abscissa is the halo position (Halo waith), in millimeters (mm). Figure 3B , Figure 3D and Figure 3F Schematic diagram of the actual display image corresponding to each backlight module. It can be seen from the figure that when there is no supporting structure and the supporting structure is a reflective material, there is a halo with concentrated light (reference Figure 3A and Figure 3C ), there are serious grid patterns (reference Figure 3B and Figure 3D ); the supporting structure uses a translucent material with a halo of scattered light (reference Figure 3E ), there is a slight grid pattern (reference Figure 3F ), has good comprehensive optical effects.

[0045] The size of the support structure 132 in the thickness direction ranges from 0.5 to 1.5 mm, and the thickness direction is parallel to the surface of the back plate 11. Figure 1 and Figure 2B As shown, for the supporting substructure located between two adjacent light sub-regions in the supporting structure 132, the line connecting the center points of the two adjacent light sub-regions is taken as the first direction (i.e., the x direction), and the size of the supporting substructure between the two adjacent light sub-regions in the first direction is taken as the width. The aforementioned thickness setting enables the supporting structure 132 to have sufficient strength and sufficient thickness to fully diffuse the incident light.

[0046] Since the support structure 132 is not completely transparent, the thicker the support structure 132 is, the stronger the light diffusion effect is. When the thickness of the support structure 132 reaches a certain level, according to the total reflection principle, after the light of one light partition enters the partition structure, it is not easy to emit to the air layer of the adjacent light partition. The light propagates inside the support structure 132 and finally emits from the light emitting surface, which is conducive to solving the light leakage problem between light partitions, thereby blocking different light partitions, reducing light crosstalk between different light partitions, and improving the product's single partition contrast. On the contrary, the thinner the support structure 132 is, the weaker the light diffusion effect is, and the worse the effect of blocking different light partitions is, which is suitable for scenes with low single partition contrast.

[0047] refer to Figure 4A-4H As shown, it is a schematic diagram of the simulation results provided by the embodiment of the present application, and optical simulations are performed for the thickness of the support structure 132 of 2.0 mm, 1.5 mm, 0.5 mm, and 0.3 mm, respectively. Figure 4A and Figure 4B Corresponding to 2.0mm, Figure 4C and Figure 4D Corresponding to 1.5mm, Figure 4E and Figure 4F Corresponding to 0.5mm, Figure 4G and Figure 4H Corresponding to 0.3mm, Figure 4A , Figure 4C , Figure 4E and Figure 4G Schematic diagram of visual effects at various positions under different support structures 132, Figure 4B , Figure 4D , Figure 4F and Figure 4H The schematic diagram of the brightness distribution of each position under different support structures 132 is shown. Theoretically, the thicker the support structure 132 is, the more obvious the visual effect grid is. It can be seen from the figure that the visual effect of 2mm is poor, and the grid between the partitions is heavier (reference Figure 4A ), uneven brightness distribution (reference Figure 4B), which is consistent with the theory; 1.5mm is significantly improved compared to 2mm, but the grid between partitions still exists (reference Figure 4C ), brightness uniformity has also improved (reference Figure 4D ); 0.5mm visual effect is further improved, and the grid between partitions is slight (reference Figure 4E ), the brightness uniformity is further improved (reference Figure 4F ); The optical effect of 0.3mm width is close to that of 0.5mm (reference Figure 4G and 4H ), but the actual mold cannot be formed due to the thin wall thickness. That is, the aforementioned 0.5-1.5 mm is a reasonable thickness range of the support structure 132.

[0048] For multiple light partitions, any one of the multiple light partitions can be taken as an example and used as a target light partition. The part of the diffusion structure 131 corresponding to the target light partition is used as a target unit. The thickness of the target unit first decreases and then increases in the direction from the center to the edge. In this way, when the light-emitting element 121 is facing the center of the target unit, the area from the center of the target unit to the position with the smallest thickness can be used as a convex lens to focus the light emitted by the light-emitting element 121, so that the small-angle divergent light emitted by the light-emitting element 121 is focused to obtain relatively parallel light, and the area from the position with the smallest thickness to the edge of the target unit can be regarded as a concave lens to diverge the large-angle light emitted by the light-emitting element 121, so that more light enters the supporting structure 132, thereby increasing the brightness of the supporting structure 132. In this way, different light partitions simultaneously perform light compensation on adjacent supporting structures 132 to avoid mura (uneven display brightness) problems.

[0049] That is, by adjusting the thickness at different positions of the diffusion structure 131, the incident light intensity at different positions is matched, so that the emitted light is more uniform, and the overall surface uniformity of the product is improved. The distribution of the thickness value of the target unit can be adjusted according to the actual situation, and is used to match various types of light-emitting elements 121, so as to meet the various needs of the product, and the adjustment direction is clear, the effect is easy to observe, and time and labor are saved.

[0050] In addition, the luminous intensity of the light-emitting element 121 at the center position of the target unit is relatively large, so a thicker diffusion structure 131 is set to provide a larger diffusion effect; the luminous intensity of the light-emitting element 121 at the periphery of the center position is relatively weak, so a thinner diffusion structure 131 is set to provide a smaller diffusion effect, which is beneficial to ensure a larger light intensity and make the light on the light-emitting surface uniform.

[0051] Specifically, the light-incoming surface of the target unit includes a first surface at the center and a second surface CC surrounding the center. The surface of the target unit on the light-emitting side of the backlight module is a plane. The morphology of the first surface and the second surface determines the thickness of the target unit. The second surface CC is a curved surface that is concave toward the light-emitting side of the target unit. The second surface CC is connected to the first surface on the side facing the center of the target unit, and is connected to the support structure 132 on the side facing away from the center of the target unit, so that the thickness of the target unit decreases first and then increases in the direction from the center to the edge.

[0052] The first surface may include a plane AA at the center, and a connecting surface BB between the plane AA and the second surface CC. The connecting surface BB may be a plane or a curved surface, for example, a curved surface protruding toward the light emitting element, to achieve a smooth transition between the first surface and the second surface, for example, to improve the uniformity of light emission. Alternatively, the first surface may be a curved surface protruding toward the light emitting element, and the first surface and the second surface are connected.

[0053] In the embodiment of the present application, the backlight module 10 may further include a reflective structure located on the side of the light board 12 away from the back board 11, which is used to reflect the light emitted by the light-emitting element to the diffuser 13, so that the reflectivity of the upper surface of the light board 12 is greater than 85%, and then a mixed light space can be formed in the space between the reflective plate and the diffuser structure 131, thereby increasing the effective utilization rate of light. The reflective structure may be a reflective material coated on the upper surface of the light board 12, such as white ink, etc., or a reflective film attached to the light board 12.

[0054] The backlight module 10 may further include a plastic frame 14 connected to the back plate 11. The plastic frame 14 is arranged around the light board. The plastic frame 14 and the back plate 11 form a frame structure. The light board 12 and the diffuser plate 13 in the backlight module 10 are located inside the frame structure. The plastic frame 14 may include an inner plastic frame and an outer plastic frame outside the inner plastic frame. The connection portion of the back plate 11 extends upward and is placed between the inner plastic frame and the outer plastic frame, which is conducive to obtaining a stable frame structure.

[0055] Other optical components 20 may also be arranged on the backlight module 10, such as an optical film, etc. The optical film may include at least one of a brightness enhancement film, a prism layer and a diffusion film. The brightness enhancement film may be a reflective polarizer (Dual Brightness Enhancement Film, DBEF), which can improve the utilization efficiency of the optical fiber. The prism layer can change the emission angle of the light, thereby changing the viewing angle of the display device. The diffusion film is used to diffuse the light to further improve the uniformity of light emission.

[0056] A display panel may be arranged on the other optical components 20. For example, an adhesive tape may be arranged on the other optical components 20, and the display panel may be arranged on the adhesive tape, and the adhesive tape fixes the optical components 20 and the display panel together. An adhesive tape may also be arranged on the portion of the plastic frame 14 close to the optical components 20 to fix the display panel to the backlight module 10. Optionally, the adhesive tape may be a light shielding tape to prevent light leakage from the display device.

[0057] The embodiment of the present application provides a backlight module, including a diffusion plate, a light board and a back plate, the diffusion plate includes a diffusion structure and a plurality of supporting structures, the diffusion structure between adjacent supporting structures corresponds to a light partition, the supporting structure is a light-transmitting material, so that the light in the light partition can enter the supporting structure, the outgoing light intensity at the position where the supporting structure is located is improved, which is conducive to improving the uniformity of the light output brightness of the backlight module, the haze of the diffusion structure is greater than zero, the light board is located on the light incident side of the diffusion plate and in contact with the supporting structure, the light board includes a plurality of light-emitting elements, and the plurality of light-emitting elements are respectively arranged in a plurality of light partitions, and the back plate is located on the side of the light board away from the diffusion plate. In this way, the light entering the diffusion plate can be diffused by the diffusion plate to improve the uniformity, and the supporting structure is used to support the diffusion structure, maintain the distance between the diffusion structure and the light board, avoid the diffusion structure from warping and deformation and collapse toward the light board, improve the uniformity of the light output brightness of the backlight module, avoid the display device from having grid patterns, lamp shadows and other poor display problems, and improve the display quality.

[0058] The embodiment of the present application also provides a display device, including the backlight module 10 and the display panel 100 described in the above embodiment, which can be a vehicle-mounted display device. The display panel can be a liquid crystal panel, which includes a color filter substrate, a liquid crystal layer, and an array substrate, etc. The color filter substrate includes a color filter, the array substrate includes a circuit layer for providing a driving signal, and the liquid crystal layer has liquid crystal molecules. The liquid crystal molecules are deflected under the action of the electric field generated by the driving signal, and the transmittance of the light is modulated to achieve brightness control.

[0059] refer to Figure 5 , is a schematic diagram of a planar structure of a display device provided in an embodiment of the present application. As can be seen from the figure, the display device 1000 includes a display panel 100 and a backlight module 10, the backlight module 10 and the display panel 100 are stacked, and the backlight module 10 is the backlight module 10 described in the above embodiment.

[0060] The display device 1000 provided in the embodiment of the present application can be a display device with display function such as a mobile phone, a computer, a television, a car display device, etc., and the embodiment of the present application does not make specific limitations. The display device 1000 provided in the embodiment of the present application has the beneficial effects of the backlight module 10 provided in the embodiment of the present application. For details, please refer to the specific description of the backlight module 10 in the above embodiment, and the embodiment of the present application will not be repeated here.

[0061] The present application also provides a means of transport, referring to Figure 6 As shown, it is a schematic diagram of a means of transportation provided in an embodiment of the present application. The means of transportation may include the display device provided in the above embodiment. The means of transportation may be a car, an airplane, a ship, etc. The display device provided in the above embodiment may be used as a dashboard 34 or a central control display screen 35, wherein the central control display screen 35 is the aforementioned display device 1000.

[0062] The above is only a preferred implementation of the present application. Although the present application has been disclosed as a preferred embodiment, it is not intended to limit the present application. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the scope of protection of the technical solution of the present application.

Claims

1. A backlight module, characterized in that: include: A diffusion plate, the diffusion plate comprising a diffusion structure and a plurality of supporting structures, the diffusion structure between adjacent supporting structures corresponds to a light partition, the supporting structure is made of a light-transmitting material, and the haze of the diffusion structure is greater than zero; a light board, the light board being located at the light incident side of the diffuser plate and in contact with the support structure; The light panel comprises a plurality of light emitting elements, and the plurality of light emitting elements are respectively arranged in a plurality of light partitions; The back plate is located on a side of the light plate away from the diffusion plate.

2. The backlight module according to claim 1, characterized in that: The supporting structure includes a first substrate, and the light transmittance of the first substrate is greater than 30% and less than 99%.

3. The backlight module according to claim 1, characterized in that: The support structure includes a first matrix and particles distributed in the first matrix.

4. The backlight module according to claim 3, characterized in that: The diffusion structure includes a second matrix and particles distributed in the second matrix.

5. The backlight module according to claim 4, characterized in that: The particle concentration in the diffusion structure is greater than or equal to the particle concentration in the support structure.

6. The backlight module according to claim 1, characterized in that: The haze of the support structure is greater than 70%, and the haze of the diffusion structure is greater than 70%.

7. The backlight module according to claim 1, characterized in that: The size of the support structure in the thickness direction ranges from 0.5 to 1.5 mm, and the thickness direction is parallel to the surface of the back plate.

8. The backlight module according to claim 1, characterized in that: The diffusion structure and the support structure are an integrated structure.

9. The backlight module according to any one of claims 1 to 8, characterized in that: For a target light partition among the multiple light partitions, a portion of the diffusion structure corresponding to the target light partition is used as a target unit, and a thickness of the target unit first decreases and then increases in a direction from the center to the edge.

10. The backlight module according to claim 9, characterized in that: The light incident side surface of the target unit includes a first surface at a central position and a second surface surrounding the central position; The second surface is a curved surface recessed toward the light-emitting side of the target unit. The second surface is connected to the first surface at a side facing the center of the target unit, and is connected to the support structure at a side facing away from the center of the target unit.

11. The backlight module according to claim 10, characterized in that: The first surface includes a plane at a central position and a connecting surface between the plane and the second surface.

12. The backlight module according to claim 9, characterized in that: The surface of the target unit on the light-emitting side of the backlight module is a plane.

13. The backlight module according to any one of claims 1 to 8, characterized in that: Also includes: A reflective structure is located on a side of the light panel away from the back panel.

14. A display device, characterized in that: It comprises a display panel and the backlight module according to any one of claims 1 to 13.

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