Backlight module and display device

Abstract

Provided in the present invention are a backlight module and a display device. The backlight module comprises: at least one light source; a light guide plate, which comprises a light input face, a light output face and a bottom face arranged opposite to the light output face, the light input face being located on the side of the light guide plate that faces the light source; a diffuser, which is located on a light output face side of the light guide plate, and comprises a first surface and a second surface which are arranged opposite to each other, the first surface being closer to the light guide plate than the second surface, wherein the bottom face and / or the first surface is a light-adjusting face, the light-adjusting face is provided with a plurality of light-adjusting units, and the light-adjusting units are configured to adjust light rays, such that a light output angle of the diffuser is within a preset range. The backlight module in the present invention has the advantages of a small light output angle and a high center brightness.

Description

Backlight units and display devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on January 26, 2024, with application number 202410115641.5 and invention name "Backlight module and display device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The invention relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0004] With the development of electronic products, the application scenarios of display devices are gradually increasing, and the requirements for display devices in different application scenarios are different. For example, head-mounted display devices used in the field of near-eye display require smaller luminous power to prevent users from feeling dizzy due to smearing when wearing the head-mounted display devices. This means that a larger current is required to achieve the same backlight brightness with the same size and the same structure. As the current increases, the power consumption of the display device increases.

[0005] Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a backlight module and a display device.

[0007] According to one aspect of the present invention, there is provided a backlight module, comprising:

[0008] at least one light source;

[0009] a light guide plate, the light guide plate comprising a light incident surface, a light emitting surface, and a bottom surface arranged opposite to the light emitting surface, the opposite ends of the light incident surface being connected to the light emitting surface and the bottom surface, respectively, and the light incident surface being located on a side of the light guide plate facing the light source;

[0010] a diffuser, the diffuser being located on the light-emitting surface side of the light guide plate, the diffuser comprising a first surface and a second surface oppositely disposed, the first surface being closer to the light guide plate than the second surface;

[0011] The bottom surface and / or the first surface is a dimming surface having a plurality of dimming units, and the dimming units are configured to adjust the light so that the light output angle of the diffuser is within a preset range.

[0012] In some optional embodiments, when the bottom surface is the dimming surface, the dimming unit on the bottom surface is a first dimming unit, and at least two of the multiple first dimming units are arranged with projection intervals on the first reference surface, and at least two of the multiple first dimming units are arranged with projection intervals on the second reference surface, wherein the first reference surface is perpendicular to the first direction, the second reference surface is perpendicular to the second direction, the first direction is the arrangement direction of the light source and the light guide plate, and the first direction intersects with the second direction.

[0013] In some optional embodiments, the distribution density of the first dimming units gradually increases in a direction away from the light incident surface.

[0014] In some optional embodiments, the maximum height of the plurality of first dimming units in the thickness direction of the light guide plate gradually increases in a direction away from the light incident surface.

[0015] In some optional embodiments, the first dimming unit has at least one adjustment surface facing the light incident surface; the angle between the adjustment surface and the plane where the light guide plate is located is greater than or equal to 10° and less than or equal to 45°.

[0016] In some optional embodiments, the first dimming unit is a pit that is recessed from the bottom surface toward one side of the light emitting surface.

[0017] In some optional embodiments, the shape of the pit is a triangular prism, and the triangular prism includes: a first side, a first side surface adjacent to the first side, a second side surface, and a third side surface opposite to the first side surface; the first side surface is located at the bottom of the pit and extends along the second direction; the first side surface and the second side surface are two side walls of the pit.

[0018] In some optional embodiments, the maximum depth of the pit is greater than or equal to 1 micron and less than or equal to 15 microns.

[0019] In some optional embodiments, the distance between two adjacent first dimming units in the first direction has a first gap, and the first gap and the maximum distance between one of the first dimming units in the first direction range from greater than or equal to 10 microns to less than or equal to 100 microns.

[0020] In some optional embodiments, the third side has a first sub-edge extending along the first direction, and a second sub-edge extending along the second direction; the length range of the first sub-edge is greater than or equal to 0 microns and less than or equal to 100 microns; the length range of the second sub-edge is greater than or equal to 0 microns and less than or equal to 100 microns.

[0021] In some optional embodiments, the volume of the pits ranges from greater than or equal to 0 micrometers to less than or equal to 78,000 cubic micrometers.

[0022] In some optional embodiments, the bottom surface further includes: a plurality of first protrusions; the orthographic projections of the first protrusions on the light-emitting surface do not overlap with the orthographic projections of the first dimming unit on the light-emitting surface; and the ends of the first protrusions are planes.

[0023] In some optional embodiments, at least part of the ends of the first protrusions are further provided with a second protrusion, and the outer surface of the second protrusion is hemispherical or semi-elliptical.

[0024] In some optional embodiments, when the first surface is the dimming surface, the dimming unit on the first surface is a second dimming unit, the second dimming unit extends along the second direction, and a plurality of the second dimming units are arranged at intervals along the first direction, wherein the first direction is the arrangement direction of the light source and the light guide plate, and the first direction intersects with the second direction.

[0025] In some optional embodiments, a longitudinal section of the second dimming unit perpendicular to the first direction is a triangular structure, and an angle of the triangular structure away from the second surface is greater than or equal to 45° and less than or equal to 145°.

[0026] In some optional embodiments, the minimum distance between two adjacent second dimming units in the first direction is greater than or equal to 10 micrometers and less than or equal to 90 micrometers.

[0027] In some optional embodiments, the second surface has a plurality of diffusion units, at least two of the plurality of diffusion units are arranged with an orthographic projection interval on the first reference plane, and at least two of the plurality of diffusion units are arranged with an orthographic projection interval on the second reference plane, wherein the first reference plane is perpendicular to the first direction, and the second reference plane is perpendicular to the second direction.

[0028] In some optional embodiments, the minimum distance between two adjacent diffusion units is greater than or equal to 10 micrometers and less than or equal to 100 micrometers.

[0029] In some optional embodiments, the diffusion unit includes a curved surface convex in a direction away from the first surface.

[0030] In some optional embodiments, a plurality of light emitting units are provided on the light emitting surface, the light emitting units extend along the second direction, and the plurality of light emitting units are arranged at intervals along the first direction.

[0031] In some optional embodiments, the maximum height of the light emitting unit is less than 1 micrometer; the length of the light emitting unit in the first direction is greater than or equal to 3 micrometers and less than or equal to 25 micrometers.

[0032] In some optional embodiments, the backlight module further includes a prism assembly, and the prism assembly includes:

[0033] a first prism sheet, the first prism sheet being located on a side of the diffuser away from the light guide plate, the first prism sheet having a plurality of first prisms on a surface of the side away from the diffuser, the first prisms extending along the first direction, and the plurality of first prisms being arranged at intervals along the second direction;

[0034] A second prism sheet, wherein the second prism sheet is located on a side of the first prism sheet away from the diffuser sheet, and a surface of the second prism sheet on a side away from the first prism sheet has a plurality of second prisms, the second prisms extend along the second direction, and the plurality of second prisms are arranged at intervals along the first direction.

[0035] In some optional embodiments, the backlight module further includes: a flexible circuit board, and a first bonding adhesive; a portion of the flexible circuit board is in contact with and fixed to the light source, and another portion of the flexible circuit board is in contact with and fixed to a portion of the light guide plate via the first bonding adhesive;

[0036] Wherein, the light guide plate is provided with a first groove at a position where it contacts and is fixed with the flexible circuit board, and the first bonding adhesive is located in the first groove.

[0037] In some optional embodiments, the light guide plate includes: a third surface close to the side of the flexible circuit board and located around the first groove; and a surface of the first bonding adhesive facing away from the light guide plate, which is flush with the third surface.

[0038] In some optional embodiments, the backlight module further includes: a reflective portion; the reflective portion is located between the first bonding adhesive and the flexible circuit board.

[0039] In some optional embodiments, the flexible circuit board has a second groove at a position opposite to the reflective portion; the reflective portion is in contact with a portion of the second groove; and a surface of the light source facing the flexible circuit board is flush with the third surface.

[0040] In some optional embodiments, the backlight module further includes: a plastic frame; the reflectivity of the plastic frame is greater than or equal to 75%.

[0041] In some optional embodiments, the backlight module further includes: a second laminating tape laminating to the plastic frame; the reflectivity of the second laminating tape is greater than or equal to 75%.

[0042] In some optional embodiments, the second bonding tape is a white bonding tape.

[0043] In some optional embodiments, the light guide plate further includes: a plurality of side surfaces connecting the light emitting surface and the bottom surface; the side surfaces include: the light incident surface and a plurality of first sub-side surfaces;

[0044] The backlight module further includes a shielding structure; the shielding structure wraps around at least a portion of at least a portion of the first sub-side surface, and the shielding structure is configured to block light from the light guide plate from being emitted.

[0045] In some optional embodiments, the shielding structure is reflective adhesive.

[0046] According to another aspect of the present invention, a display device is provided, comprising the above-mentioned backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0048] FIG1A shows a top view of a backlight module according to an optional embodiment of the present invention;

[0049] FIG1B shows a perspective schematic diagram of a backlight module according to an optional embodiment of the present invention;

[0050] FIG2A shows a view taken along the line AA in FIG1A ;

[0051] FIG2B shows a BB view in FIG1A ;

[0052] FIG3 shows a diagram of the light path in the diffuser of FIG2A ;

[0053] FIG4A shows a diagram of the light path in the light guide plate in FIG2A ;

[0054] FIG4B shows one schematic diagram of a light guide plate;

[0055] FIG4C shows a schematic diagram of a first dimming unit;

[0056] FIG5A shows a schematic structural diagram of the light guide plate in FIG1A ;

[0057] FIG5B shows a schematic structural diagram of the bottom surface of the light guide plate;

[0058] FIG6 shows a view of the first prism in FIG1A from another angle;

[0059] FIG7 shows a brightness distribution diagram of the center position of the backlight module at different viewing angles in another optional embodiment of the present invention;

[0060] FIG8 shows a flowchart of manufacturing a light guide plate in another optional embodiment of the present invention;

[0061] FIG9 shows a schematic structural diagram of a backlight module in an example;

[0062] FIG10 shows a diagram of the light path in the diffuser in FIG9 ;

[0063] FIG11 shows a brightness distribution diagram at different viewing angles at the center of the backlight module in FIG9 ;

[0064] FIG12A is a schematic diagram showing the relationship between the light guide plate and the flexible circuit board;

[0065] FIG12B shows a schematic diagram of the flexible circuit board in FIG12A ;

[0066] FIG. 12C is a schematic diagram showing the light guide plate in FIG. 12A .

[0067] 10. Light source; 20. Light guide plate; 21. Light incident surface; 22. Light emitting surface; 221. Light emitting unit; 23. Bottom surface; 30. Diffuser; 31. First surface; 32. Second surface; 321. Diffuser unit; 40. First dimming surface; 41. First dimming unit; 411. Adjustment surface; 50. Second dimming surface; 51. Second dimming unit; 60. Prism assembly; 61. First prism sheet; 611. First prism; 62. Second prism sheet; 621. Second prism; 70. Reflector; 80. Primary template; 90. Secondary template; 100. Lower mold core; 110. Upper mold core. DETAILED DESCRIPTION

[0068] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0069] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0070] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0071] As used herein, "parallel" and "perpendicular" include the conditions described and conditions similar to the conditions described, and the range of the similar conditions is within an acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range for approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range for approximate perpendicularity can also be, for example, a deviation within 5°.

[0072] It will be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present therebetween.

[0073] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary drawings. In the drawings, the thicknesses of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include deviations in shape due to, for example, manufacturing. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0074] Figure 1A shows a schematic top view of a backlight module according to one embodiment of the present invention. Figure 2A shows a view taken along arrows AA in Figure 1A, and Figure 2B shows a view taken along arrows BB in Figure 1A. As can be seen from Figures 1A and 2A, the backlight module includes at least one light source 10, a light guide plate 20, and a diffuser 30. The light guide plate 20 includes a light incident surface 21, a light exit surface 22, and a bottom surface 23 disposed opposite the light exit surface 22. The light incident surface 21 is located on the side of the light guide plate 20 facing the light source 10. The light incident surface 21 is connected to both the light exit surface 22 and the bottom surface 23, allowing light emitted by the light source 10 to enter the light guide plate 20 from one side, forming an edge-lit backlight module. After entering the light guide plate 20, some of the light is reflected multiple times between the light exit surface 22 and the bottom surface 23 before exiting through the light exit surface 22. Another portion of the light is reflected directly from the bottom surface 23 to the light exit surface 22 and then exits. The light exiting the light guide plate 20 enters the diffuser 30.

[0075] When there are multiple light sources 10, the light guide plate 20 has multiple light incident surfaces 21, with each light source 10 corresponding to a light incident surface 21 (see Figure 2A). For example, when there are two light sources 10, the two light sources 10 are located on opposite sides of the light guide plate 20. Thus, there are two light incident surfaces 21, one located on opposite sides of the light emitting surface 22 and the bottom surface 23. This allows light emitted from each light source 10 to enter the interior of the light guide plate 20 through its corresponding light incident surface 21.

[0076] In the specific embodiment shown in FIG2A , the diffuser 30 is located on the light-emitting side of the light guide plate 20. The diffuser 30 includes a first surface 31 and a second surface 32 arranged opposite to each other, with the first surface 31 being closer to the light guide plate 20 than the second surface 32. The bottom surface 23 and the first surface 31 serve as dimming surfaces. The dimming surface has a plurality of dimming units, which are configured to adjust the light so that the light-emitting angle of the diffuser 30 is within a preset range. By arranging a plurality of dimming units on the dimming surface, the dimming units adjust the light so that the light emitted from the diffuser 30 is concentrated within a preset angle range to increase the brightness of the light. This arrangement increases the brightness of the light emitted by the backlight module under the same current, thereby reducing the power consumption of the backlight module.

[0077] It should be noted that the function of the diffuser 30 is not to diffuse the light in a large angle direction, but to even out the light and adjust the light so that the light is evenly distributed within a preset angle range.

[0078] In some optional embodiments, only the bottom surface 23 serves as a dimming surface, while the diffuser 30 does not have a dimming surface. The dimming surface can adjust the light so that the light emitted by the diffuser 30 is concentrated within a preset angle range, thereby achieving the effect of increasing the brightness of the light. For example, when the bottom surface 23 serves as an adjustment surface, the light emitted by the light guide plate 20 is concentrated within the preset angle range, while the diffuser 30 can only perform a uniform light distribution function without any adjustment function, ensuring that the light emitted by the diffuser 30 remains concentrated within the preset angle range.

[0079] In other optional embodiments, only the first surface 31 is a dimming surface, and the light guide plate 20 does not have a dimming surface, which can adjust the light so that the light emitted by the diffuser 30 is concentrated within a preset angle range, thereby achieving the effect of improving the brightness of the light.

[0080] In the specific embodiment shown in Figure 2A, the bottom surface 23 and the first surface 31 are both dimming surfaces. When the light is irradiated to the dimming unit on the bottom surface 23, the dimming unit on the bottom surface 23 performs preliminary adjustment on the light to reduce the light emission angle. After the light is transmitted from the light guide plate 20 to the diffuser 30, the dimming unit on the diffuser 30 adjusts the light again. After the light is adjusted twice by the light guide plate 20 and the diffuser 30, the light emitted by the diffuser 30 is concentrated within a preset angle range, which is beneficial to improving the light output brightness of the backlight module.

[0081] It should be noted that although the bottom surface 23 and the first surface 31 can be a dimming surface, the specific structures of the dimming units of the dimming surfaces in different structures are different. For example, when the bottom surface 23 is a dimming surface, the dimming units are a two-dimensional structure, while when the first surface 31 is a dimming surface, the dimming units are a one-dimensional structure. A two-dimensional structure means that the dimming units are arranged in two directions, or have periodicity in two dimensions, while a one-dimensional structure means that the dimming units are arranged in one direction, or have periodicity in one dimension.

[0082] In some optional embodiments, referring to Figures 2A and 4A, when the bottom surface 23 is a dimming surface, the bottom surface 23 is a first dimming surface 40, and the first dimming surface 40 has a plurality of first dimming cells 41. The projections of at least two of the plurality of first dimming cells 41 on a first reference plane are spaced apart, and the projections of at least two of the plurality of first dimming cells 41 on a second reference plane are spaced apart. The first reference plane is perpendicular to a first direction, and the second reference plane is perpendicular to a second direction. The first direction is the arrangement direction of the light source 10 and the light guide plate 20, and the first direction intersects the second direction. In other words, the plurality of first dimming cells 41 are divided into a plurality of rows of first dimming groups, the plurality of rows of first dimming groups being spaced apart along the first direction, and each first dimming group having at least one first dimming cell. If each first dimming group has only one first dimming cell, the at least two first dimming cells are not aligned in the second direction, so that the at least two first dimming cells are arranged in the second direction. If at least one first dimming group includes a plurality of first dimming units, the plurality of first dimming units in the first dimming group are spaced apart along the second direction.

[0083] It should be noted that the first direction is direction X, and the second direction is direction Y.

[0084] In some optional embodiments, the distribution density of the first dimming units 41 gradually increases in a direction away from the light incident surface 21. In the light guide plate 20, the light intensity in the area close to the light incident surface 21 is greater than the light intensity in the area away from the light incident surface 21. The distribution density of the first dimming units 41 in the area close to the light incident surface 21 is low, so as to ensure the intensity of the light transmitted to the area away from the light incident surface 21. This is conducive to the uniform distribution of the light intensity of the light emitted from the light exiting surface 22, and reduces the situation where the light intensity in some areas of the light exiting surface 22 is too strong and the light intensity in other areas is too weak.

[0085] It should be noted that when there is only one light source 10, only one side of the light guide plate 20 has a light incident surface 21. In this case, the distribution density of the first dimming units 41 within the entire light guide plate 20 gradually increases in the direction away from the light incident surface 21. If there are two light sources 10, and the two light sources 10 are located on opposite sides of the light guide plate 20, the distribution density of the first dimming units 41 gradually increases from the two light incident surfaces 21 toward the center of the light guide plate 20.

[0086] In some optional embodiments, the maximum height of the plurality of first dimming units 41 in the thickness direction of the light guide plate 20 gradually increases in the direction away from the light incident surface 21. The light intensity in the area near the light incident surface 21 within the light guide plate 20 is greater than the light intensity in the area away from the light incident surface 21. In the area near the light incident surface 21, the maximum height of the first dimming units 41 in a plane perpendicular to the light guide plate 20 is smaller, which can reduce the intensity of light reflected to the light emitting surface 22, thereby ensuring the light intensity guided to the area away from the light incident surface 21, and facilitating uniform distribution of the light intensity emitted from the light emitting surface 22.

[0087] It should be noted that when there is only one light source 10, only one side of the light guide plate 20 has the light incident surface 21. In this case, the maximum height of the multiple first dimming units 41 in the entire light guide plate 20 in the thickness direction of the light guide plate 20 gradually decreases and increases in the direction away from the light incident surface 21. If there are two light sources 10, and the two light sources 10 are located on opposite sides of the light guide plate 20, the maximum height of the first dimming units 41 in the thickness direction of the light guide plate 20 gradually increases from the two light incident surfaces 21 toward the center of the light guide plate 20.

[0088] In some optional embodiments, referring to FIG. 2A , the first dimming unit 41 has at least one adjustment surface 411 facing the light incident surface 21, and the distance between the adjustment surface 411 and the light emitting surface 22 gradually decreases in a direction away from the corresponding light incident surface 21. The adjustment surface 411 is an inclined plane, which facilitates reflecting light onto the light emitting surface 22 so that the light is emitted from the light emitting surface 22.

[0089] It should be noted that when the light guide plate 20 has one light incident surface 21, the first dimming unit 41 has an adjustment surface 411. If the light guide plate 20 has two light incident surfaces 21, the two light incident surfaces 21 are located on opposite sides of the light guide plate 20. For example, the two light incident surfaces 21 are respectively the first light incident surface and the second light incident surface. The first dimming unit 41 may have only one adjustment surface 411, and the adjustment surfaces 411 on the multiple first dimming units 41 close to the first light incident surface face the first light incident surface, and the adjustment surfaces 411 on the multiple first dimming units 41 close to the second light incident surface face the second light incident surface. Alternatively, each first dimming unit 41 may have two adjustment surfaces 411, and the two adjustment surfaces 411 are arranged facing the two light incident surfaces 21. There is no specific restriction on the correspondence between the adjustment surface 411 and the light incident surface 21 on the first dimming unit 41. It is only necessary to ensure that the first dimming unit 41 has at least one adjustment surface 411 facing the light incident surface 21.

[0090] In some optional embodiments, the maximum heights of the adjustment surfaces 411 on the multiple first dimming units 41 gradually increase in a direction away from the light incident surface 21, which helps ensure uniform light output from the light output surface 22. When a first dimming unit 41 has multiple adjustment surfaces 411, the maximum heights of the multiple adjustment surfaces 411 are the same. It is sufficient to ensure that the maximum heights of the first dimming unit 41 gradually increase in a direction away from the light incident surface 21.

[0091] Optionally, the maximum height of the adjustment surface 411 is the maximum height of the first dimming unit 41 .

[0092] In some optional embodiments, the first dimming unit 41 is in the shape of a quadrangular pyramid.

[0093] In some optional embodiments, the first dimming unit 41 is in the shape of a triangular prism.

[0094] In some optional embodiments, the angle between the adjustment surface 411 and the plane where the light guide plate 20 is located is greater than or equal to 10° and less than or equal to 45°. If the angle between the adjustment surface 411 and the plane where the light guide plate 20 is located is less than 10°, it is not conducive to the light being incident on the adjustment surface 411. If the angle between the adjustment surface 411 and the plane where the light guide plate 20 is located is greater than 45°, it is not conducive to the adjustment surface 411 reflecting the light onto the light exit surface 22. Limiting the angle between the adjustment surface 411 and the plane where the light guide plate 20 is located to a range of 10° to 45° is conducive to the adjustment surface 411 receiving light and reflecting the light onto the light exit surface 22.

[0095] In some optional embodiments, the first dimming unit 41 has an adjustment surface 411, and the technical solution in which the maximum height of the adjustment surfaces 411 on the multiple first dimming units 41 gradually increases in the direction away from the light incident surface 21 can have various forms. For example, the angles between the multiple adjustment surfaces 411 and the plane where the light guide plate 20 is located are the same, and the widths of the multiple adjustment surfaces 411 in the first direction gradually increase in the direction away from the light incident surface 21. For another example, the widths of the multiple adjustment surfaces 411 in the first direction are the same, and the angles between the multiple adjustment surfaces 411 and the plane where the light guide plate 20 is located gradually increase. It is also possible that the widths of the multiple adjustment surfaces 411 in the first direction and the angles between the multiple adjustment surfaces 411 and the plane where the light guide plate 20 is located are different, and no specific limitation is made here.

[0096] In some optional embodiments, the length of the adjustment surface 411 in the first direction is greater than or equal to 10 microns and less than or equal to 45 microns. The length of the adjustment surface 411 in the first direction refers to the length of the orthographic projection of the adjustment surface 411 on the plane of the light guide plate 20 in the first direction. By limiting the length of the adjustment surface 411 in the first direction, it is helpful to control the maximum height of the adjustment surface 411 within a reasonable range, which helps to ensure that light is adjusted while it is transmitted horizontally within the light guide plate 20.

[0097] 4B , 4C and 5B , wherein FIG4C is a three-dimensional schematic diagram corresponding to the first dimming unit 411 in FIG4B , that is, the portion where the bottom surface 23 of the light guide plate 20 is removed. In some optional embodiments, the first dimming unit 411 is a pit recessed from the bottom surface 23 toward the light emitting surface 22 . In a specific implementation, the structure shown in FIG4C can be dug out (stamped or injection molded) from the bottom surface 23 of the light guide plate 20 , thereby forming a plurality of pit-shaped first dimming units 411 on one side of the bottom surface 23 .

[0098] In some optional embodiments, referring to Figures 4B, 4C and 5B, the shape of the pit is a triangular prism, which includes: a first side F, a first side surface S1 adjacent to the first side surface F, a second side surface S2, and a third side surface S3 opposite to the first side surface F; the first side surface F is located at the bottom of the pit, and the first side surface F extends along the second direction Y; wherein, the light emitted by the light source 10 (as shown by the arrow in Figure 4C) is incident on the first dimming unit 411 through the first side surface S1 and the second side surface S2; the first side surface S1 and the second side surface S2 are the two side walls of the pit.

[0099] In some optional embodiments, as shown in FIG. 4C , the maximum depth range H of the pit is greater than or equal to 1 micrometer and less than or equal to 15 micrometers.

[0100] In some optional embodiments, as shown in Figure 5B, the distance between two adjacent first dimming units 411 in the first direction X has a first gap O, and the maximum distance a1 between the first gap O and one of the first dimming units 411 in the first direction is greater than or equal to 10 microns and less than or equal to 100 microns.

[0101] In some optional embodiments, as shown in Figure 4C, the third side surface S3 has a first sub-edge D1 extending along the first direction X, and a second sub-edge D2 extending along the second direction Y; the length range of the first sub-edge D1 is greater than or equal to 0 microns and less than or equal to 100 microns; the length range of the second sub-edge D2 is greater than or equal to 0 microns and less than or equal to 100 microns.

[0102] In some optional embodiments, as shown in FIG4C , the volume of the dimple (i.e., the first dimming unit 411) is greater than or equal to 0 micrometers and less than or equal to 78,000 cubic micrometers. This ensures that the display device has a good display image quality. Optionally, as shown in FIG4C , the volume V of the first dimming unit 411 is V = D1 * D2 * H.

[0103] In some optional embodiments, as shown in FIG4B , the bottom surface further includes: a plurality of first protrusions 412; the orthographic projections of the first protrusions 412 on the light-emitting surface 22 do not overlap with the orthographic projections of the first dimming units 411 on the light-emitting surface; and the ends of the first protrusions 412 are flat. Optionally, the area of ​​the bottom surface 23 of the light guide plate 20 excluding the first dimming units 411 can serve as the first protrusions 412.

[0104] In some optional embodiments, as shown in FIG4B , at least some of the ends of the first protrusions 412 are further provided with second protrusions 413, and the outer surface of the second protrusions 413 is hemispherical or semi-elliptical. In the disclosed embodiment, at least some of the ends of the first protrusions 412 are further provided with second protrusions 413, which can reduce the contact area between the light guide plate 20 and the reflective plate 70, thereby reducing the risk of adsorption and improving the brightness uniformity of the backlight module.

[0105] In some optional embodiments, the ends of all first protrusions 412 may be provided with the second protrusions 413. In some optional embodiments, the ends of only some first protrusions 412 may be provided with the second protrusions 413.

[0106] In some optional embodiments, when the first surface 31 is a dimming surface, the first surface 31 is a second dimming surface 50, and the second dimming surface 50 has a plurality of second dimming units 51. The second dimming units 51 extend along a first direction X, and the plurality of second dimming units 51 are arranged at intervals along a second direction Y. The first direction is the arrangement direction of the light source 10 and the light guide plate 20, and the first direction intersects the second direction. In other words, the second dimming units 51 are strip-shaped structures, and the strip structures are arranged in the same direction. By providing multiple second dimming units 51 on the first surface 31, it is beneficial to control the light output angle of the diffuser 30 within a preset angle range, thereby improving the light output intensity.

[0107] In some optional embodiments, the second dimming unit 51 may also extend along the second direction Y, and the plurality of light emitting units 221 may be arranged at intervals along the first direction X.

[0108] In some optional embodiments, referring to FIG. 2A , the second dimming unit 51 protrudes in a direction away from the second surface 32, and a longitudinal cross-section of the second dimming unit 51 perpendicular to the second direction has a triangular structure, with the angle of the triangular structure away from the second surface 32 being greater than or equal to 45° and less than or equal to 145°. Limiting the angle of the triangular structure away from the second surface 32 to within the range of 45° to 145° facilitates smooth entry of light into the diffuser 30, reduces reflection by the second dimming unit 51, and effectively reduces light energy loss.

[0109] In some optional embodiments, the maximum length of the second dimming cells 51 in the first direction is greater than or equal to 20 microns and less than or equal to 180 microns. Controlling the maximum length of the second dimming cells 51 in the first direction within a range of 20 microns to 180 microns helps ensure the distribution density of the second dimming cells 51, reduces the light output angle, and reduces the difficulty of manufacturing the diffuser 30.

[0110] In some optional embodiments, as shown in Figure 3, the minimum spacing a2 between two adjacent second dimming units 51 in the first direction X is greater than or equal to 10 microns and less than or equal to 90 microns, which is beneficial to ensure the distribution density of the second dimming units 51, reducing the difficulty of manufacturing the diffuser 30 while narrowing the light output angle.

[0111] In some optional embodiments, the second surface 32 comprises a plurality of diffusion units 321, wherein at least two of the plurality of diffusion units 321 are spaced apart in their orthographic projections on a first reference plane, and at least two of the plurality of diffusion units 321 are spaced apart in their orthographic projections on a second reference plane, wherein the first reference plane is perpendicular to the first direction, and the second reference plane is perpendicular to the second direction. In other words, the diffusion units 321 have a two-dimensional structure. Alternatively, the plurality of diffusion units 321 are divided into multiple rows of diffusion groups, each of which is spaced apart along the first direction, each containing at least one diffusion unit 321. If each diffusion group contains only one diffusion unit 321, the at least two diffusion units 321 are not aligned in the first direction, such that the at least two diffusion units 321 are arranged in the second direction. Alternatively, if at least one diffusion group contains multiple diffusion units 321, the multiple diffusion units 321 within the diffusion group are spaced apart along the second direction.

[0112] By providing multiple diffusion units 321 on the second surface 32, it is beneficial to evenly distribute the light, avoiding the situation where the light intensity in some areas is strong and the light intensity in other areas is weak, so that the light emitted by the diffusion sheet 30 is evenly distributed within a preset angle.

[0113] In some optional embodiments, the length of the diffusion unit 321 in the first direction is greater than or equal to 10 microns and less than or equal to 100 microns. This configuration can ensure the light uniformity effect of the diffusion unit 321 while avoiding increasing the difficulty of manufacturing the diffusion sheet 30.

[0114] In some optional embodiments, the minimum spacing between two adjacent diffusion units 321 ranges from greater than or equal to 10 microns to less than or equal to 100 microns. This arrangement ensures the uniform light effect of the diffusion units 321 while avoiding increasing the difficulty of manufacturing the diffusion sheet 30. In some optional embodiments, the minimum spacing between two adjacent diffusion units 321 can be the spacing between two adjacent diffusion units 321 in the first direction X; in some optional embodiments, the minimum spacing between two adjacent diffusion units 321 can be the spacing between two adjacent diffusion units 321 in the second direction Y.

[0115] 2A and 3 , the diffusion unit 321 includes a curved surface that protrudes away from the first surface 31. In other words, the diffusion unit 321 is a protrusion disposed on the second surface 32, and is a semicircular or elliptical protrusion.

[0116] In some optional embodiments, referring to FIG. 5A , a plurality of light emitting units 221 are provided on the light emitting surface 22. The light emitting units 221 are configured to couple light from the light guide plate 20. The light emitting units 221 extend along a first direction X, and the plurality of light emitting units 221 are spaced apart along a second direction Y. Providing a plurality of light emitting units 221 on the light emitting surface 22 not only achieves uniform light distribution, but also facilitates uniform light distribution. Furthermore, the extension direction of the light emitting units 221 is parallel to the extension direction of the second dimming units 51. The light emitting units 221 cooperate with the second dimming units 51 to further reduce the light output angle of the diffuser 30.

[0117] In some optional embodiments, the light emitting unit 221 may also extend along the second direction Y, and a plurality of light emitting units 221 may be arranged at intervals along the first direction X.

[0118] In some optional embodiments, the maximum height of the light emitting unit 221 is less than 1 micron. This arrangement ensures the uniform light effect while ensuring the thickness of the light guide plate 20, which is conducive to making the backlight module lighter and thinner.

[0119] In some optional embodiments, the length of the light emitting unit 221 in the first direction is greater than or equal to 3 micrometers and less than or equal to 25 micrometers. This configuration can ensure the light emitting unit 221 has a uniform light effect on the light and reduce the waste of light energy.

[0120] In some optional embodiments, referring to Figures 2A and 6, the backlight module also includes a prism assembly 60, the prism assembly 60 includes a first prism sheet 61 and a second prism sheet 62, the first prism sheet 61 is located on the side of the diffuser 30 away from the light guide plate 20, and the surface of the first prism sheet 61 away from the diffuser 30 has a plurality of first prisms 611, the first prisms 611 extend along the first direction, and the plurality of first prisms 611 are arranged at intervals along the second direction; the second prism sheet 62 is located on the side of the first prism sheet 61 away from the diffuser 30, and the surface of the second prism sheet 62 away from the first prism sheet 61 has a plurality of second prisms 621, the second prisms 621 extend along the second direction, and the plurality of second prisms 621 are arranged at intervals along the first direction. By setting up the prism assembly 60, the light can be further concentrated and the light output angle of the backlight module can be reduced. In addition, the extension direction of the first prism 611 is crossed with the extension direction of the second dimming unit 51, and the extension direction of the second prism 621 is parallel to the extension direction of the second dimming unit 51. This can reduce the light output angle of the prism assembly 60 and further reduce the light output angle of the backlight module, which is conducive to more concentrated light intensity of the backlight module.

[0121] In some optional embodiments, referring to FIG. 2A , the backlight module further includes a reflective plate 70 , which is located on a side of the light guide plate 20 away from the diffuser 30 , to reflect light emitted from the light guide plate 20 through the bottom surface 23 into the light guide plate 20 , thereby reducing light energy loss.

[0122] The structural design of the first surface 31 and the second surface 32 of the diffuser 30 of the present invention is that the first surface 31 is a dimming surface, and the second surface 32 has multiple diffusion units 321. These can adjust the light output from the light guide plate 20 to a preset angle range. The light within this range can be further adjusted to near 0° through the first prism sheet 61 and the second prism sheet 62, thereby making the light output angle of the backlight module greater than or equal to -5° and less than or equal to 5°. This makes the light output from the backlight module more concentrated within the range of -5° to 5°, achieving the effect of improving brightness. For example, the light output angle of the backlight module is greater than or equal to -2° and less than or equal to 2°.

[0123] The light uniformity of the backlight module shown in Figure 9 is 81.9%, and the half-peak width of the viewing angle is 46.7°. If the relative center brightness of the backlight module shown in Figure 10 is 100%, please refer to Figure 11. Then, in an optional embodiment of the present invention, for example, when the light output angle of the diffuser 30 is in the range of 50° to 60°, the light uniformity of the backlight module is 86.6%, the half-peak width of the viewing angle is 49.1°, and the relative center brightness of the backlight module is 144%, please refer to Figure 7. It can be seen that the center brightness of the backlight module in this application is improved by 44% and the uniformity is improved by 5.7% relative to the backlight module shown in Figure 9, while the viewing angle level is basically the same.

[0124] In addition, Figure 10 is a diagram of the light path in the diffuser in Figure 9, and Figure 3 shows a diagram of the light path in the diffuser in Figure 2A. From the comparison between Figure 10 and Figure 3, it can be seen that the light output angle of the diffuser 30 in Figure 3 becomes smaller and is concentrated within a preset angle range, for example, concentrated in the range of 40° to 75°, for example, concentrated in the range of 45° to 70°, and for example, concentrated in the range of 50° to 60°.

[0125] It should be noted that when the refractive index of the first prism base layer in the first prism sheet 61 and the second prism base layer in the second prism sheet 62 is within the range of 1.45 to 1.65, and the refractive index of the first prism 611 and the second prism 621 is within the range of 1.57 to 1.77, the peak brightness at the center of the backlight module first increases and then decreases with the light output angle of the diffuser 30. The peak brightness reaches its maximum at 50° to 60°, and reaches half of the maximum peak brightness at 40° and 75°. At 80° to 85°, the peak brightness at the center of the backlight module drops sharply, falling to 10% of the maximum peak brightness. While the light output angle of the diffuser 30 of the backlight module shown in Figure 9 is mostly concentrated in the range of 80° to 85°, the light output angle of the diffuser 30 of the backlight module shown in the present invention is within the range of 40° and 75°, effectively improving the brightness at the center.

[0126] For example, the refractive index of the first prism base layer and the second prism base layer is 1.55. For another example, the refractive index of the first prism 611 and the second prism 621 is 1.67.

[0127] Optionally, the light emission angle of the diffuser 30 is within a range of 40° and 75°.

[0128] When the angle of the diffuser 30 is in the range of 40° to 85°, the central viewing angle of the light emitted by the backlight module is less than 20°. It can be seen that by limiting the light output angle of the diffuser 30 to the range of 40° and 75°, the brightness of the center position can be improved while ensuring that the central viewing angle of the backlight module remains unchanged.

[0129] It should be noted that the angle of the light is the angle between the light and an axis perpendicular to the plane where the light guide plate 20 is located.

[0130] In some embodiments, as shown in Figures 12A-12C , the backlight module further includes a flexible circuit board 104 and a first bonding adhesive 105. A portion of the flexible circuit board 104 is in contact with and fixed to the light source 10, while another portion of the flexible circuit board 104 is in contact with and fixed to a portion of the light guide plate 20 via the first bonding adhesive 105. The light guide plate 20 is provided with a first groove F1 at the location where it is in contact with and fixed to the flexible circuit board 104, and the first bonding adhesive 105 is located within the first groove F1. In the disclosed embodiment, the first groove F1 provided on the light guide plate 20 and the first bonding adhesive 105 located within the first groove F1 can direct light emitted by the light source 10 to a greater extent within the light guide plate 20, reducing the amount of light incident on the first bonding adhesive 105. This avoids the problem in related designs where light emitted by the light source 10 enters the first bonding adhesive 105 and is directly emitted outside the light guide plate 20 through the first bonding adhesive 105, resulting in ineffective utilization of the light guide plate 20. Moreover, due to the design of the first groove F1, even if light enters the first bonding adhesive 105, it can enter the light guide plate 20 again and be reused, and will not directly enter the air layer, thereby effectively improving the utilization rate of the light source.

[0131] In some embodiments, as shown in Figures 12A-12C , the light guide plate 20 includes a third surface G1 located near the flexible circuit board 104 and around the first groove F1; and a surface of the first adhesive 104 facing away from the light guide plate 20 that is flush with the third surface G1. This maximizes the light emitted by the light source 10 and allows it to be directed into the light guide plate 20, improving light source utilization.

[0132] In some embodiments, the first groove F1 can be a through groove that passes through the light guide plate 20 along the second direction Y; in some embodiments, the first groove F1 can also be a structure including multiple sub-first grooves, each sub-first groove is located at a position corresponding to the light source 10, and adjacent sub-first grooves are spaced apart, that is, adjacent sub-first grooves are not connected.

[0133] In some embodiments, as shown in Figures 12A-12C , the backlight module further includes a reflective portion 106 located between the first laminating adhesive 105 and the flexible circuit board 104. In the disclosed embodiment, the reflective portion 106 is located between the first laminating adhesive 105 and the flexible circuit board 104 to reflect light entering the first laminating adhesive 105 and allow it to re-enter the light guide plate 20, further improving light utilization.

[0134] In some embodiments, as shown in Figures 12A-12C , the flexible circuit board 104 has a second groove F2 at a position opposite the reflective portion 106; the reflective portion 106 partially contacts the second groove F2; and the surface of the light source 10 facing the flexible circuit board 104 is flush with the third surface G1. In the disclosed embodiment, the second groove F2 on the flexible circuit board 104, which is opposite the reflective portion 106, allows the surface of the light source 10 facing the flexible circuit board 104 to be flush with the third surface G1, thereby allowing light emitted by the light source 10 to enter the light guide plate 20 to the greatest extent possible.

[0135] In some embodiments, as shown in FIG1B , the backlight module further includes a plastic frame 101 ; the reflectivity of the plastic frame 101 is greater than or equal to 75%. In the disclosed embodiment, the plastic frame 101 is made of a highly reflective material to further enhance the brightness of the backlight module. Optionally, the material of the plastic frame 101 may include polycarbonate (PC).

[0136] In some embodiments, as shown in FIG1B , the backlight module further includes a second laminating tape 103 attached to the frame 101 ; the reflectivity of the second laminating tape 103 is greater than or equal to 75%. In the disclosed embodiment, the reflectivity of the second laminating tape 103 is greater than or equal to 75%, which can further enhance the brightness of the backlight module.

[0137] In some embodiments, the second laminating tape 103 is a white laminating tape. Since the white laminating tape has a reflective effect, the light incident on the second laminating tape 103 can be reflected back to the backlight module, thereby improving the brightness of the backlight module.

[0138] In some embodiments, as shown in FIG. 1B , the second laminating tape 103 may be a rubber ring, which can laminate the backlight module to the upper display panel.

[0139] In some embodiments, the light guide plate 20 further includes: a plurality of side surfaces connecting the light emitting surface 22 and the bottom surface 23; the side surfaces include: a light incident surface and a plurality of first sub-side surfaces H; and as shown in FIG5A , the backlight module further includes: a shielding structure 107; the shielding structure 107 wraps around at least a portion of at least a portion of the first sub-side surfaces H, and is configured to block light from exiting the light guide plate 20. In the disclosed embodiment, a portion of the first sub-side surfaces H of the light guide plate 20 is further wrapped with the shielding structure 107 for blocking or reflecting light, which can further enhance the brightness of the backlight module.

[0140] In some embodiments, the shielding structure 107 is a reflective adhesive, thereby improving the brightness of the backlight module.

[0141] The light guide plate 20 of the present invention can be formed by various process methods such as injection molding and hot pressing, wherein the mold core can be formed by various process methods such as laser, photolithography, and collision point. Figure 8 is an example of the process flow of photolithography mold core and injection molding light guide plate, and its main process includes photolithography, coating, electroplating, transfer, compounding, and injection molding. In detail: a primary template 80 is formed by photolithography, a corrosion-resistant material is coated on the primary template 80 to form a secondary template 90, and then the secondary template 90 is electroplated to form a metal film on the secondary template 90, the secondary template 90 and the metal film are separated, and a lower mold core 100 is formed on the back of the metal film, and the lower mold core 100 is compounded with the upper mold core 110 to form an injection mold, and then the light guide plate 20 is formed in the injection mold.

[0142] In some optional embodiments, the diffuser 30 is a single-layer optical film layer, which can be formed by embossing.

[0143] According to another aspect of the present invention, a display device is provided, comprising the above-mentioned backlight module. The display device having the above-mentioned backlight module has the advantages of high light efficiency and low power consumption. For example, the display device is a head-mounted display device.

[0144] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A backlight module, wherein, Comprising: At least one light source; A light guide plate, the light guide plate comprising a light incident surface, a light emitting surface and a bottom surface disposed opposite to the light emitting surface, two opposite ends of the light incident surface being respectively connected to the light emitting surface and the bottom surface, the light incident surface being located on a side of the light guide plate facing the light source; A diffusion sheet, the diffusion sheet being located on a side of the light emitting surface of the light guide plate, the diffusion sheet comprising a first surface and a second surface disposed opposite to each other, the first surface being closer to the light guide plate than the second surface; Wherein, the bottom surface and / or the first surface is a light-adjusting surface, the light-adjusting surface having a plurality of light-adjusting units configured to adjust light so that the light-emitting angle of the diffusion sheet is within a preset range.

2. The backlight module according to claim 1, wherein, When the bottom surface is the light-adjusting surface, the light-adjusting units on the bottom surface are first light-adjusting units, and at least two of the first light-adjusting units among the plurality of first light-adjusting units are spaced apart in projection on a first reference plane, and at least two of the first light-adjusting units among the plurality of first light-adjusting units are spaced apart in projection on a second reference plane, wherein the first reference plane is perpendicular to a first direction, the second reference plane is perpendicular to a second direction, the first direction is the arrangement direction of the light source and the light guide plate, and the first direction intersects the second direction.

3. The backlight module according to claim 2, wherein The distribution density of the first light-adjusting units gradually increases in a direction away from the light incident surface.

4. The backlight module according to claim 2, wherein, The maximum height of the plurality of first light-adjusting units in the thickness direction of the light guide plate gradually increases in a direction away from the light incident surface.

5. The backlight module according to claim 2, wherein, The first light-adjusting unit has at least one adjusting surface facing the light incident surface; the angle between the adjusting surface and the plane where the light guide plate is located is greater than or equal to 10° and less than or equal to 45°.

6. The backlight module according to any one of claims 2-5, wherein, The first light-adjusting unit is a pit recessed from the bottom surface toward the light emitting surface side.

7. The backlight module according to claim 6, wherein, The shape of the pit is a triangular prism, the triangular prism comprising: a first side, a first side surface adjacent to the first side, a second side surface, and a third side surface opposite to the first side; the first side is located at the bottom of the pit and extends along the second direction; the first side surface and the second side surface are two side walls of the pit.

8. The backlight module according to claim 6 or 7, wherein, The maximum depth range of the pit is greater than or equal to 1 micron and less than or equal to 15 microns.

9. The backlight module according to any one of claims 6-8, wherein, There is a first gap between two adjacent first light-adjusting units in the first direction, and the range of the maximum distance between the first gap and one of the first light-adjusting units in the first direction is greater than or equal to 10 microns and less than or equal to 100 microns.

10. The backlight module according to any one of claims 7-9, wherein, The third side surface has a first sub-side extending along the first direction and a second sub-side extending along the second direction; the length range of the first sub-side is greater than or equal to 0 micron and less than or equal to 100 microns; the length range of the second sub-side is greater than or equal to 0 micron and less than or equal to 100 microns.

11. The backlight module according to any one of claims 6-9, wherein, The volume range of the pit is greater than or equal to 0 micron and less than or equal to 78000 cubic microns.

12. The backlight module according to any one of claims 2-11, wherein, The bottom surface further includes: a plurality of first convex portions; the orthographic projection of the first convex portions on the light-emitting surface does not overlap with the orthographic projection of the first light-dimming unit on the light-emitting surface; the end of the first convex portion is a plane.

13. The backlight module according to claim 12, wherein, At least part of the end of the first convex portion is further provided with a second convex portion, and the outer surface of the second convex portion is hemispherical or semi-elliptical.

14. The backlight module according to any one of claims 1 to 13, wherein, When the first surface is the light-dimming surface, the light-dimming unit on the first surface is a second light-dimming unit, the second light-dimming unit extends in a second direction, and a plurality of the second light-dimming units are arranged at intervals in a first direction, where the first direction is the arrangement direction of the light source and the light guide plate, and the first direction intersects with the second direction.

15. The backlight module according to claim 14, wherein, The longitudinal section of the second light-dimming unit perpendicular to the first direction is a triangular structure, and the angle of the triangular structure away from the second surface is greater than or equal to 45° and less than or equal to 145°.

16. The backlight module according to claim 14, wherein, The minimum distance range between two adjacent second light-dimming units in the first direction is greater than or equal to 10 microns and less than or equal to 90 microns.

17. The backlight module according to claim 14, wherein, The second surface has a plurality of diffusion units, and at least two of the plurality of diffusion units are arranged at intervals in the orthographic projection on a first reference plane, and at least two of the plurality of diffusion units are arranged at intervals in the orthographic projection on a second reference plane, where the first reference plane is perpendicular to the first direction, and the second reference plane is perpendicular to the second direction.

18. The backlight module according to claim 17, wherein, The minimum distance range between two adjacent diffusion units is greater than or equal to 10 microns and less than or equal to 100 microns.

19. The backlight module according to claim 17, wherein, The diffusion unit includes a curved surface protruding away from the first surface.

20. The backlight module according to claim 14, wherein, A plurality of light-emitting units are arranged on the light-emitting surface, the light-emitting units extend in the second direction, and a plurality of the light-emitting units are arranged at intervals in the first direction.

21. The backlight module according to claim 20, wherein, The maximum height of the light-emitting unit is less than 1 micron; the length of the light-emitting unit in the first direction is greater than or equal to 3 microns and less than or equal to 25 microns.

22. The backlight module according to any one of claims 1 to 21, wherein, The backlight module further includes a prism assembly, and the prism assembly includes: A first prism sheet, the first prism sheet is located on the side of the diffusion sheet away from the light guide plate, and the surface of the first prism sheet away from the diffusion sheet has a plurality of first prisms, the first prisms extend in the first direction, and a plurality of the first prisms are arranged at intervals in the second direction; A second prism sheet, the second prism sheet is located on the side of the first prism sheet away from the diffusion sheet, and the surface of the second prism sheet away from the first prism sheet has a plurality of second prisms, the second prisms extend in the second direction, and a plurality of the second prisms are arranged at intervals in the first direction.

23. The backlight module according to any one of claims 1-22, wherein, The backlight module further includes: a flexible circuit board and a first adhesive; a part of the flexible circuit board is in contact and fixed with the light source, and another part of the flexible circuit board is in contact and fixed with a part of the light guide plate through the first adhesive; Wherein, the light guide plate is provided with a first groove at the position where it is in contact and fixed with the flexible circuit board, and the first adhesive is located in the first groove.

24. The backlight module according to claim 23, wherein, The light guide plate includes: a third surface near the flexible circuit board and around the first groove; the surface of the first adhesive away from the light guide plate is flush with the third surface.

25. The backlight module according to claim 24, wherein, The backlight module further includes: a reflection part; the reflection part is located between the first adhesive and the flexible circuit board.

26. The backlight module according to claim 25, wherein, The flexible circuit board has a second groove at a position opposite to the reflection part; the reflection part is in partial contact with the second groove; the surface of the light source facing the flexible circuit board is flush with the third surface.

27. The backlight module according to any one of claims 1-26, wherein, The backlight module further includes: a rubber frame; the reflectivity of the rubber frame is greater than or equal to 75%.

28. The backlight module according to claim 27, wherein, The backlight module further includes: a second adhesive tape attached to the rubber frame; the reflectivity of the second adhesive tape is greater than or equal to 75%.

29. The backlight module according to claim 28, wherein, The second adhesive tape is a white adhesive tape.

30. The backlight module according to any one of claims 1-29, wherein, The light guide plate further includes: a plurality of side surfaces connecting the light-emitting surface and the bottom surface; the side surfaces include: the light-incident surface and a plurality of first sub-side surfaces. The backlight module further includes: a shielding structure; the shielding structure wraps at least part of at least part of the first sub-side surfaces, and the shielding structure is configured to block the light in the light guide plate from exiting.

31. The backlight module according to claim 30, wherein, The shielding structure is a reflective glue.

32. A display device, wherein, Including the backlight module according to any one of claims 1 to 31.

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