Backlight module, display device and electronic device

Abstract

The present application provides a backlight module, a display device and an electronic device, wherein the backlight module comprises: a light-emitting unit, wherein the light-emitting unit has a first light-emitting surface, and the first light-emitting surface is used to emit light; a light guide plate, wherein the light guide plate has a light-entering surface and a second light-emitting surface, wherein the light-entering surface is arranged adjacent to the first light-emitting surface and is used to receive the light emitted by the first light-emitting surface, and the second light-emitting surface is connected to the light-entering surface by a bend, and the second light-emitting surface is used to emit light; and a reflective plate, wherein the reflective plate is arranged on a side of the light guide plate away from the second light-emitting surface, and the reflective plate is at least partially arranged opposite to the light-emitting unit, and is used to reflect the light emitted from the first light-emitting surface to the light guide plate; and a back plate, wherein the back plate is arranged on a side of the light guide plate away from the second light-emitting surface, and the back plate is used to accommodate the light-emitting unit, the light guide plate and the reflective plate, and the back plate has a groove, and the groove is used to accommodate the fixed reflective plate, wherein the reflective plate reinforces the light to the shadow of the backlight module through multiple reflections, thereby effectively solving the problem of poor shadow.

Description

Technical Field

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

[0002] At present, with the improvement of people's living standards, various electronic products are becoming more and more popular in various fields such as office, scientific research, medical treatment, vehicle and aerospace. Among them, home electronic products such as notebooks (NB), monitors (MNT), televisions (TV) and tablet personal computers (Tablet PC) are indispensable daily necessities for modern people. Most small and medium-sized electronic products such as NB and MNT use side-entry backlight sources, which have the advantages of light and thin body and low cost, but uneven screen, especially prone to bad shadow (hot spot) phenomenon. Among them, hot spot is a phenomenon of light emitting diode (LED) side-entry backlight source. LED is a point light source, and its light emission state is fan-shaped emission with a certain light emission angle. The light emitted by each LED light source will present a bright area on the light guide plate (LGP) light entrance side, and a dark area at the gap between LEDs. The light of the bright and dark areas is mixed at intervals to form light-emitting areas with different brightness, alternating between light and dark.

[0003] To address this problem, the industry has mostly adopted methods to overcome it, such as changing the A / P value (A represents the distance between the light source and the edge of the display area, and P represents the distance between the centers of two adjacent light sources) and the arrangement of light guide plate dots. However, the light source utilization rate is low, the energy consumption is high, and the hot spot phenomenon has not been fully and effectively resolved. Summary of the invention

[0004] The present invention provides a backlight module, the backlight module comprising:

[0005] A light emitting unit, wherein the light emitting unit has a first light emitting surface, and the first light emitting surface is used for emitting light;

[0006] A light guide plate, the light guide plate having a light incident surface and a second light emitting surface, the light incident surface is disposed adjacent to the first light emitting surface and is used to receive light emitted from the first light emitting surface, the second light emitting surface is bent and connected to the light incident surface, and the second light emitting surface is used to emit light; and

[0007] a reflector, the reflector being disposed on a side of the light guide plate away from the second light emitting surface, and at least part of the reflector being disposed directly opposite to the light emitting unit, for reflecting light emitted from the first light emitting surface to the light guide plate;

[0008] A back plate is arranged on a side of the light guide plate away from the second light emitting surface, the back plate is used to accommodate the light emitting unit, the light guide plate and the reflector, and the back plate has a groove, and the groove is used to accommodate and fix the reflector.

[0009] Wherein, the reflector comprises:

[0010] A first surface, the first surface faces the light guide plate, and the first surface is used to transmit light; and

[0011] The second surface is arranged opposite to the first surface and is used to reflect the light incident from the first surface to the reflection plate to the light guide plate; the reflection plate is also partially arranged corresponding to the light guide plate.

[0012] Wherein, the reflector comprises:

[0013] a reflective body, the reflective body having the first surface and the second surface, the first surface comprising a first sub-surface, a second sub-surface and a third sub-surface sequentially arranged in a direction away from the light-emitting unit, the first sub-surface at least partially facing the light-emitting unit, and the third sub-surface at least partially facing the light guide plate; and

[0014] A light shielding layer is disposed on the first surface and the light shielding layer is disposed on the second sub-surface.

[0015] Among them, the first sub-surface and the third sub-surface are both exposed on the back plate, the first sub-surface is flush with the surface of the back plate where the groove is set or the first sub-surface is recessed in the surface of the back plate where the groove is set, and the third sub-surface is flush with the surface of the back plate where the groove is set or the third sub-surface is recessed in the surface of the back plate where the groove is set.

[0016] Wherein, the reflector further comprises:

[0017] A first end surface, the first end surface is bent and connected to the first surface and the second surface, and the first surface and the second surface are both arranged on the same side of the first end surface, and the first end surface is attached to the back plate to form an inner wall of the groove; and

[0018] The second end face is arranged opposite to the first end face, the second end face is bent and connected to the first surface and the second surface, and the first surface and the second surface are both arranged on the same side of the second end face, and the second end face is attached to the back plate to form the inner wall of the groove.

[0019] Wherein, the second light emitting surface has a distribution area, and the projection range of the distribution area on the light guide plate at least partially covers the projection range of the reflector on the light guide plate; the light guide plate comprises:

[0020] a light guide plate body; and

[0021] A plurality of network points are arranged in the distribution area.

[0022] There are multiple light-emitting units, and there are gaps between the multiple light-emitting units;

[0023] The distribution area includes a plurality of first sub-distribution areas and a plurality of second sub-distribution areas, the first sub-distribution areas are arranged corresponding to the light-emitting units, and the second sub-distribution areas are arranged corresponding to the gaps between two adjacent light-emitting units;

[0024] The density of the dots located in the first sub-distribution area is greater than the density of the dots located in the second sub-distribution area.

[0025] Wherein, the backlight module further includes:

[0026] A frame, wherein an orthographic projection of the frame on the second light emitting surface of the light guide plate covers the second light emitting surface of the light guide plate;

[0027] The light guide plate has a first direction, which is the direction in which the light-emitting unit points to the light guide plate, the orthographic projection of the frame on the second light-emitting surface covers an area of ​​the second light-emitting surface with a size range of L1 along the first direction, and the size range of the distribution area along the first direction is L2, and L1 satisfies: L1≤L2 / 3.

[0028] The present invention further provides a display device, comprising a display panel and the backlight module, wherein the backlight module is arranged at one side of the display panel and is used to provide a surface light source for the display panel.

[0029] The present invention further provides an electronic device, comprising a housing and the display device, wherein the housing is used to accommodate the display device.

[0030] The backlight module provided in the embodiment of the present application includes a light-emitting unit, a light guide plate, a reflective plate and a back plate, wherein the reflective plate is arranged on the side of the light guide plate away from the second light-emitting surface, and the reflective plate is at least partially arranged opposite to the light-emitting unit, and is used to reflect the light emitted from the first light-emitting surface to the light guide plate, and the back plate has a groove, and the groove is used to accommodate and fix the reflective plate. The light of the light-emitting unit that is not incident on the light guide plate can be reflected into the light guide plate through the reflective plate, thereby achieving the reuse of light and improving the efficiency of light utilization. The reflective plate uses the principle of total reflection of light to reinforce the light to the shadow of the backlight module after multiple reflections, thereby effectively solving the problem of bad shadows. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic structural diagram of the backlight module of an embodiment of the present application.

[0033] Figure 2 yes Figure 1 A partially enlarged structural schematic diagram of the backlight module provided in FIG.

[0034] Figure 3 yes Figure 1 A partially enlarged structural schematic diagram of a backlight module is provided in FIG.

[0035] Figure 4 yes Figure 1 A schematic diagram of the partial structure of the cross section of the backlight module along the AA line is provided.

[0036] Figure 5 It is a partial structural schematic diagram of a cross section of a backlight module along line AA according to an embodiment of the present application.

[0037] Figure 6 It is a partial structural schematic diagram of a cross section of a backlight module along line AA according to an embodiment of the present application.

[0038] Figure 7 It is a partial structural schematic diagram of the cross section of the backlight module of the comparative embodiment along the AA line.

[0039] Figure 8 It is a partially enlarged structural schematic diagram of a backlight module according to an embodiment of the present application.

[0040] Fig. 9It is a partially enlarged structural schematic diagram of the backlight module of the comparative embodiment.

[0041] Fig.10 It is a schematic diagram of light refraction of the backlight module according to an embodiment of the present application.

[0042] Fig.11 It is a partially enlarged structural schematic diagram of a backlight module according to an embodiment of the present application.

[0043] Fig.12 It is a schematic diagram of the structure of a display device according to an embodiment of the present application.

[0044] Fig.13 It is a schematic diagram of the structure of an electronic device according to an embodiment of the present application.

[0045] Description of reference numerals:

[0046] 1-electronic device, 10-display device, 20-housing, 11-backlight module, 12-display panel, 111-light emitting unit, 112-light guide plate, 113-reflection plate, 114-back plate, 115-frame, 116-reflection paper, 1111-first light emitting surface, 1121-light incident surface, 1122-second light emitting surface, 1123-distribution area, 1124-light guide plate body, 1125-net point, 112a-first sub-distribution area, 112b-second sub-distribution area, 1131-first surface, 1132-second surface, 1133-reflection body, 1134-light shielding layer, 1135-first end surface, 1136-second end surface, 113a-first sub-surface, 113b-second sub-surface, 113c-second sub-surface, 1141-groove, D1-first direction DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the 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.

[0048] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0049] Reference to "embodiment" or "implementation" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 is a schematic structural diagram of a backlight module according to an embodiment of the present application, Figure 2 yes Figure 1 A partially enlarged structural diagram of a backlight module provided in FIG. Figure 3 yes Figure 1 A partially enlarged schematic diagram of the structure of the backlight module provided in FIG. Figure 4 yes Figure 1 A schematic diagram of the partial structure of the cross section of the backlight module along the AA line provided in the figure. The backlight module 11 of the embodiment of the present invention comprises a light emitting unit 111, a light guide plate 112, a reflective plate 113 and a back plate 114. The light emitting unit 111 has a first light emitting surface 1111, and the first light emitting surface 1111 is used to emit light. The light guide plate 112 has a light incident surface 1121 and a second light emitting surface 1122, and the light incident surface 1121 is arranged adjacent to the first light emitting surface 1111, and is used to receive the light emitted by the first light emitting surface 1111. The second light emitting surface 1122 is connected to the light incident surface 1121 by a bend, and the second light emitting surface 1122 is used to emit light. The reflector 113 is disposed on a side of the light guide plate 112 away from the second light emitting surface 1122, and at least a portion of the reflector 113 is disposed opposite to the light emitting unit 111, and is used to reflect the light emitted from the first light emitting surface 1111 to the light guide plate 112. The back plate 114 is disposed on a side of the light guide plate 112 away from the second light emitting surface 1122, and is used to accommodate the light emitting unit 111, the light guide plate 112, and the reflector 113, and the back plate 114 has a groove 1141, and the groove 1141 is used to accommodate and fix the reflector 113.

[0051] The backlight module 11 can be applied to a liquid crystal display (LCD) to provide a surface light source in the liquid crystal display. The backlight module 11 includes a light emitting unit 111, a light guide plate 112 (Light Guide Plate, LGP), a reflector 113 and a back plate 114. The backlight module 11 may also include other components, such as a circuit board, etc. It can be understood that the other components of the backlight module 11 should not be a limitation of the backlight module 11 provided in this embodiment.

[0052] The backlight module 11 can be divided into an edge-entry backlight module 11 and a direct-type backlight module 11 according to the different incident positions of the light source. The direct-type backlight module 11 is to set the light source (such as a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED)) behind the liquid crystal panel to directly form a surface light source to provide to the liquid crystal panel. The edge-entry backlight module 11 is to set the backlight source at the edge of the back plate 114 behind the side of the liquid crystal panel. The light emitted by the backlight source enters the light guide plate 112 from the light incident surface 1121 on one side of the light guide plate 112, and is emitted from the light exit surface of the light guide plate 112 after reflection and diffusion, and then passes through the optical film group to form a surface light source to provide to the liquid crystal panel. In the schematic diagram of the implementation mode of the present application, the backlight module 11 is taken as an example of an edge-entry backlight module 11 . The edge-entry backlight module 11 can save costs and create a relatively thin liquid crystal display body.

[0053] The light-emitting unit 111 may be, but is not limited to, a light-emitting diode (LED) lamp bead. The light-emitting unit 111 is used to emit light and provide a light source in the backlight module 11. The number of the light-emitting units 111 may be, but is not limited to, one, two, or more. In the schematic diagram provided in this embodiment, a plurality of light-emitting units 111 are used as an example for illustration. The shape design of the light-emitting unit 111 may be, but is not limited to, a rectangular parallelepiped, a cylinder, or other irregular shapes. It is understandable that the shape design of the light-emitting unit 111 should not be a limitation on the backlight module 11 provided in this embodiment.

[0054] The material of the light guide plate 112 may be, but is not limited to, an optical acrylic plate or a polycarbonate (PC) plate, etc. It is understandable that the light guide plate 112 may also be made of other materials, and the material composition of the light guide plate 112 should not be a limitation on the backlight module 11 provided in this embodiment. The light guide plate 112 is used to convert the point light source emitted by the light-emitting unit 111 into a uniform and stable surface light source in the backlight module 11. The light guide plate 112 may be, but is not limited to, a rectangular plate or other shapes.

[0055] The light incident surface 1121 of the light guide plate 112 is disposed adjacent to the first light emitting surface 1111 of the light emitting unit 111. The light incident surface 1121 of the light guide plate 112 may be, but is not limited to, disposed parallel or substantially parallel to the first light emitting surface 1111 of the light emitting unit 111. The light incident surface 1121 of the light guide plate 112 is used to receive the light emitted from the first light emitting surface 1111, that is, the light emitted from the light emitting unit 111 enters the light guide plate 112 via the light incident surface 1121. The light incident surface 1121 may be, but is not limited to, a plane, a curved surface, or a surface designed in other shapes. In the schematic diagram provided in the present embodiment, the light incident surface 1121 is illustrated as a plane. It can be understood that the light incident surface 1121 may also be a surface designed in other shapes. The shape design of the light incident surface 1121 should not be a limitation on the backlight module 11 provided in the present embodiment.

[0056] The second light emitting surface 1122 of the light guide plate 112 is connected to the light incident surface 1121 by bending, and the bending angle between the second light emitting surface 1122 of the light guide plate 112 and the light incident surface 1121 may be, but is not limited to, 90° or approximately 90°. The second light emitting surface 1122 may be, but is not limited to, a plane, or a curved surface, or a surface designed in other shapes. In the schematic diagram provided in the present embodiment, the second light emitting surface 1122 of the light guide plate 112 is taken as an example of a plane, so as to facilitate the provision of a uniform surface light source. The second light emitting surface 1122 can be used to emit light, that is, after the light of the light emitting unit 111 is incident on the light guide plate 112, it is reflected and scattered in the light guide plate 112, and is emitted through the second light emitting surface 1122, thereby converting the point light source of the light emitting unit 111 into a uniform surface light source.

[0057] The backlight module 11 also includes a reflector 113. As display products require ultra-narrow frame modules, the distance from the light-emitting unit 111 to the light-entering surface 1121 of the light guide plate 112 is only 4 to 5 mm. Fig.12) is prone to produce the problem of bad shadow (Hot spot). In the traditional side-entry backlight module, a reflective paper 116 is generally set on the side of the light guide plate 112 away from the second light emitting surface 1122, and is used to reflect the light from the bottom surface back to the light guide plate 112 to prevent light leakage, thereby increasing the efficiency of light use, but the Hot spot phenomenon will be fully exposed in the effective light emitting area of ​​the backlight module 11. In this embodiment, the backlight module 11 includes the reflective paper 116 and the reflective plate 113 as an example for illustration. The reflective paper 116 is used to reflect the light at the bottom of the light guide plate 112 back to the light guide plate 112, and the reflective plate 113 uses the principle of total reflection of light to make the light outside the light guide plate 112 incident into the light guide plate 112, and reuse the light emitted by the light-emitting unit 111 to the non-light guide plate 112 area, thereby avoiding the waste of light source, and the light source is reinforced to the shadow of the light emitting area of ​​the backlight module 11 after multiple reflections, thereby effectively solving the bad shadow problem.

[0058] The number of the reflective plates 113 may be, but is not limited to, one, two or more. The reflective plate 113 is disposed on the side of the light guide plate 112 away from the second light emitting surface 1122, and at least partially disposed opposite to the light emitting unit 111, and is used to reflect the light emitted from the first light emitting surface 1111 to the light guide plate 112, thereby making greater use of the light source, and the light source is reinforced to the shadow of the light emitting area of ​​the backlight module 11 after multiple reflections, thereby effectively solving the problem of bad shadows. The size of the part facing the reflecting plate 113 and the light-emitting unit 111 can be adjusted according to the actual solution of the shadow phenomenon in different display products, that is, when the number of the light-emitting units 111 in the backlight module 11 is set differently, or the specifications of the light-emitting units 111 are set differently, or the gap between the light guide plate 112 and the light-emitting unit 111 is different, the actual impact area range of the shadow problem will also be different. The specification design of the reflecting lens can be adjusted according to the shadow problem in the actual product application situation, so as to ensure that the shadow problem of the backlight module 11 can be effectively solved.

[0059] The back plate 114 may be, but is not limited to, used for carrying and accommodating and fixing the light emitting unit 111, the light guide plate 112, the reflective plate 113, etc. The material of the back plate 114 may be, but is not limited to, plastic, metal, alloy, etc. The back plate 114 may be, but is not limited to, including a portion that is attached to the light guide plate 112 and the reflective paper 116, and is used to carry the light guide plate 112 and the reflective paper 116. The back plate 114 may be, but is not limited to, also including a structural portion that is protruding away from the light emitting unit 111, and is used to accommodate the light assembly and the reflective plate 113. The back plate 114 has a groove 1141, and the groove 1141 may be used to accommodate and fix the reflective plate 113. The groove 1141 may be, but is not limited to, a rectangular parallelepiped or a substantially rectangular parallelepiped design. The number of the grooves 1141 may be, but is not limited to, one, two, or more. The number of the grooves 1141 and the number of the reflectors 113 may be, but are not limited to, equal. It is understandable that the number of the grooves 1141 may also be different from the number of the reflectors 113, and the number of the grooves 1141 should not be a limitation on the backlight module 11 provided in this embodiment. The reflector 113 may be disposed in the groove 1141 of the back plate 114. The reflector 113 may be, but is not limited to, fixed in the groove 1141 of the back plate 114 by means of snaps, soldering, or bonding. The size of the groove 1141 may be, but is not limited to, designed to fit the size of the reflector 113. In this embodiment, the size of the groove 1141 and the size of the reflector 113 are moderate, so as to facilitate the fixation of the reflector 113 in the groove 1141 of the back plate 114 and prevent the reflector 113 from loosening and affecting the luminous effect of the backlight module 11. The reflective plate 113 is fixed in the groove 1141 of the back plate 114, and can also prevent light from being emitted from the left and right end surfaces of the reflective plate 113 and reducing the utilization efficiency of the light, thereby ensuring sufficient light reflected to the shadow of the backlight module 11, thereby effectively solving the problem of poor shadow caused by the narrow frame module.

[0060] In summary, the backlight module 11 provided in this embodiment includes a light emitting unit 111, a light guide plate 112, a reflector 113 and a back plate 114. The reflector 113 is arranged on the side of the light guide plate 112 away from the second light emitting surface 1122, and the reflector 113 is at least partially arranged opposite to the light emitting unit 111, and is used to reflect the light emitted from the first light emitting surface 1111 to the light guide plate 112. The back plate 114 has a groove 1141, and the groove 1141 is used to accommodate and fix the reflector 113. The light of the light emitting unit 111 that is not incident on the light guide plate 112 can be reflected into the light guide plate 112 through the reflector 113, so as to achieve the reuse of light and improve the utilization efficiency of light. The reflector 113 uses the principle of total reflection of light to reinforce the light to the dark shadow of the backlight module 11 through multiple reflections, thereby effectively solving the problem of bad dark shadow. Compared with the traditional design, the backlight module 11 effectively improves the light utilization efficiency, so the number of light-emitting units 111 can be reduced, thereby reducing the manufacturing cost of the light-emitting unit 111 components, and reducing the heat generated in the backlight module 11, thereby reducing the defects caused by the heat of the backlight module 11 and increasing the service life of the backlight module 11. In addition, since the back panel 114 and other components in the backlight module 11 can be processed with lower-cost materials, the backlight module 11 can effectively solve the hot spot shadow problem at a lower process cost, so that the backlight module 11 has excellent optical taste in the application scenario of extremely narrow frame.

[0061] Please refer again Figure 4 The reflector 113 includes a first surface 1131 and a second surface 1132. The first surface 1131 faces the light guide plate 112 and is used to transmit light. The second surface 1132 is disposed opposite to the first surface 1131 and is used to reflect the light incident on the reflector 113 from the first surface 1131 to the light guide plate 112. The reflector 113 is also partially disposed corresponding to the light guide plate 112.

[0062] The first surface 1131 may be, but is not limited to, a plane or a curved surface, or a design of other shapes. In the schematic diagram provided in this embodiment, the first surface 1131 is taken as an example of a surface approximately in a U shape. It can be understood that the shape design of the first surface 1131 should not be a limitation on the reflector 113 provided in this embodiment. The first surface 1131 may be partially disposed toward the light emitting unit 111 and used to receive the light emitted by the light emitting unit 111. The first surface 1131 may be partially disposed toward the light guide plate 112 and used to emit light to the light guide plate 112.

[0063] The second surface 1132 may be, but is not limited to, a plane, a curved surface, or other shapes. In the schematic diagram provided in this embodiment, the second surface 1132 is taken as a plane for illustration. It can be understood that the shape design of the second surface 1132 should not be a limitation on the reflector 113 provided in this embodiment. The second surface 1132 is disposed opposite to the first surface 1131, and the second surface 1132 may be, but is not limited to, disposed in contact with the back plate 114. The sizes of the first surface 1131 and the second surface 1132 can be adjusted according to the shadow phenomenon in the actual application of the backlight module 11, that is, when the number of the light-emitting units 111 in the backlight module 11 is set differently, or the specifications of the light-emitting units 111 are set differently, or the gap between the light guide plate 112 and the light-emitting units 111 is different, the actual impact area range of the shadow problem will also be different. The sizes of the first surface 1131 and the second surface 1132 can be adjusted according to the shadow problem in the actual product application, so as to ensure that the shadow problem of the backlight module 11 can be effectively solved.

[0064] The reflective plate 113 is also partially arranged corresponding to the light guide plate 112, that is, the first surface 1131 of the reflective plate 113 is at least partially arranged opposite to the light guide plate 112, so that the reflective plate 113 reflects light to the shadow part of the light guide plate 112, and is used to intensify the light in the shadow part of the light guide plate 112, thereby ensuring that the backlight module 11 has a uniform and good display effect.

[0065] Please refer again Figure 4 The reflective plate 113 includes a reflective body 1133 and a light shielding layer 1134. The reflective body 1133 has a first surface 1131 and a second surface 1132. The first surface 1131 includes a first sub-surface 113a, a second sub-surface 113b, and a third sub-surface 113c that are sequentially arranged in a direction away from the light-emitting unit 111. The first sub-surface 113a is at least partially opposite to the light-emitting unit 111. The third sub-surface 113c is at least partially opposite to the light guide plate 112. The light shielding layer 1134 is arranged on the first surface 1131, and the light shielding layer 1134 is arranged on the second sub-surface 113b.

[0066] The reflective body 1133 may be, but is not limited to, a U-shaped, rectangular, or other shaped design. In the schematic diagram provided in this embodiment, the reflective body 1133 is designed as a U-shaped design as an example, so that the light shielding layer 1134 is conveniently arranged at the center of the reflective body 1133. The reflective body 1133 may be made of a transparent material, so as to facilitate the incidence and emission of light.

[0067] The first sub-surface 113a is at least partially opposite to the light emitting unit 111, so as to receive the light that is not emitted to the light guide plate 112 by the light emitting unit 111. The first sub-surface 113a may be, but is not limited to, a plane or a substantially plane design. In the schematic diagram of the present embodiment, the first sub-surface 113a is taken as a plane for illustration. The size range of the first sub-surface 113a opposite to the light emitting unit 111 can be adjusted according to the shadow phenomenon in the actual application of the backlight module 11, that is, when the number of the light emitting units 111 in the backlight module 11 is different, or the specification of the light emitting unit 111 is different, or the gap between the light guide plate 112 and the light emitting unit 111 is different, the actual impact area range of the shadow problem will also be different. The size range of the first sub-surface 113a opposite to the light emitting unit 111 can be adjusted according to the shadow problem in the actual product application, so as to ensure that the shadow problem of the backlight module 11 can be effectively solved.

[0068] The second sub-surface 113b can be arranged to be directly opposite or partially directly opposite to the gap between the light emitting unit 111 and the light guide plate 112, so that after the second sub-surface 113b carries the light shielding layer 1134, it can effectively prevent the reflective plate 113 from reflecting light to the gap between the light emitting unit 111 and the light guide plate 112, thereby avoiding the generation of poor display of the backlight module 11. The second sub-surface 113b can be, but is not limited to, a plane or a substantially plane design. In the schematic diagram of this embodiment, the second sub-surface 113b is taken as a plane for illustration. The size of the second sub-surface 113b can be adjusted according to the actual application of the backlight module 11, that is, when the number of the light-emitting units 111 in the backlight module 11 is set differently, or the specifications of the light-emitting units 111 are set differently, or the gap between the light guide plate 112 and the light-emitting units 111 is different, the size of the second sub-surface 113b can be adjusted accordingly to ensure that light will not be emitted from the gap between the light-emitting unit 111 and the light guide plate 112, thereby avoiding the occurrence of product defects.

[0069] The third sub-surface 113c is at least partially opposite to the light guide plate 112, so that the reflector 113 can emit light to the light guide plate 112. The third sub-surface 113c can be, but is not limited to, a plane or a substantially plane design. In the schematic diagram of this embodiment, the third sub-surface 113c is taken as a plane for illustration. The size range of the third sub-surface 113c opposite to the light guide plate 112 can be adjusted according to the shadow phenomenon in the actual application of the backlight module 11, that is, when the number of the light-emitting units 111 in the backlight module 11 is different, or the specification of the light-emitting unit 111 is different, or the gap between the light guide plate 112 and the light-emitting unit 111 is different, the actual impact area range of the shadow problem will also be different. The size range of the third sub-surface 113c opposite to the light guide plate 112 can be adjusted according to the shadow problem in the actual product application, so as to ensure that the shadow problem of the backlight module 11 can be effectively solved.

[0070] The material of the light shielding layer 1134 may be, but is not limited to, light shielding tape, light shielding cotton, or other opaque materials. The light shielding layer 1134 is disposed on the first surface 1131, and the light shielding layer 1134 is disposed on the second sub-surface 113b. The second sub-surface 113b may be, but is not limited to, concave in a direction away from the light guide plate 112 relative to the first sub-surface 113a and the third sub-surface 113c, that is, when the cross section of the reflective body 1133 is U-shaped, the light shielding layer 1134 may be disposed in the concave portion of the reflective body 1133, and when the reflective body 1133 is a rectangular parallelepiped, the light shielding layer 1134 may be exposed and disposed on the first surface 1131 of the reflective body 1133. In the schematic diagram of this embodiment, the reflective body 1133 is U-shaped, and the light shielding layer 1134 is disposed in the concave portion of the reflective body 1133 as an example for illustration. The light shielding layer 1134 can be arranged exactly or partially exactly opposite to the gap between the light emitting unit 111 and the light guide plate 112, so as to prevent the reflective plate 113 from reflecting the light to the gap between the light emitting unit 111 and the light guide plate 112, thereby avoiding the generation of poor display of the backlight module 11. The size range of the light shielding layer 1134 can be adjusted according to the actual application of the backlight module 11, that is, when the gap between the light guide plate 112 and the light emitting unit 111 is different, the size range of the light shielding layer 1134 can be adjusted accordingly to ensure that the light will not be emitted from the gap between the light emitting unit 111 and the light guide plate 112, thereby avoiding the generation of product defects.

[0071] See also Figure 4 and Figure 5, Figure 5 It is a partial structural schematic diagram of a cross section of a backlight module along line AA of an embodiment of the present application. The first sub-surface 113a and the third sub-surface 113c are both exposed on the back plate 114. The first sub-surface 113a is flush with the surface of the back plate 114 where the groove 1141 is set, or the first sub-surface 113a is recessed in the surface of the back plate 114 where the groove 1141 is set. The third sub-surface 113c is flush with the surface of the back plate 114 where the groove 1141 is set, or the third sub-surface 113c is recessed in the surface of the back plate 114 where the groove 1141 is set.

[0072] The first sub-surface 113a is exposed on the back plate 114 and is at least partially opposite to the light emitting unit 111, so as to receive the light that is not emitted to the light guide plate 112 by the light emitting unit 111. The first sub-surface 113a is flush with the surface of the back plate 114 where the groove 1141 is provided ( Figure 4 ) or the first sub-surface 113a is recessed in the surface of the back plate 114 where the groove 1141 is provided ( Figure 5 ), which can prevent the light from being emitted from the end face of the reflector 113 and reducing the light utilization efficiency, thereby ensuring that sufficient light is reflected and reinforced to the shadow of the backlight module 11, thereby effectively solving the shadow problem caused by the narrow frame module.

[0073] The third sub-surface 113c is exposed on the back plate 114 and is at least partially opposite to the light guide plate 112, so as to facilitate the reflection of light to the light guide plate 112 and reinforce the light in the shadow of the backlight module 11. The third sub-surface 113c is flush with the surface of the back plate 114 where the groove 1141 is provided ( Figure 4 ) or the third sub-surface 113c is recessed in the surface of the back plate 114 where the groove 1141 is provided ( Figure 5 ), which can prevent the light from being emitted from the end face of the reflector 113 and reducing the light utilization efficiency, thereby ensuring that sufficient light is reflected and reinforced to the shadow of the backlight module 11, thereby effectively solving the shadow problem caused by the narrow frame module.

[0074] Please refer again Figure 4The reflector 113 further includes a first end surface 1135 and a second end surface 1136. The first end surface 1135 is bent and connected to the first surface 1131 and the second surface 1132, and the first surface 1131 and the second surface 1132 are both arranged on the same side of the first end surface 1135. The first end surface 1135 is arranged to be in contact with the back plate 114 to form an inner wall of the groove 1141. The second end surface 1136 is arranged to be opposite to the first end surface 1135. The second end surface 1136 is bent and connected to the first surface 1131 and the second surface 1132, and the first surface 1131 and the second surface 1132 are both arranged on the same side of the second end surface 1136. The second end surface 1136 is arranged to be in contact with the back plate 114 to form an inner wall of the groove 1141.

[0075] The first end surface 1135 may be one of an end surface of the reflector 113 on a side close to the light emitting unit 111 or an end surface of the reflector 113 on one end close to the light guide plate 112. In the schematic diagram of the present embodiment, the first end surface 1135 is taken as an example of the end surface of the reflector 113 on a side close to the light emitting unit 111. The first end surface 1135 may be, but is not limited to, a plane or a substantially plane design. In the schematic diagram of the present embodiment, the first end surface 1135 is taken as an example of a plane, so as to facilitate the processing and design of the process.

[0076] The second end surface 1136 may be the other of the end surface of the reflector 113 on the side close to the light emitting unit 111 or the end surface of the reflector 113 on one end close to the light guide plate 112. In the schematic diagram of the present embodiment, the second end surface 1136 is taken as an example to be the end surface of the reflector 113 on one end close to the light guide plate 112. The second end surface 1136 may be, but is not limited to, a plane or a substantially plane design. In the schematic diagram of the present embodiment, the second end surface 1136 is taken as an example to be a plane, so as to facilitate the processing and design of the process.

[0077] The first end face 1135 is bent and connected to the first surface 1131 and the second surface 1132. The bending angle between the first end face 1135 and the first surface 1131 can be, but not limited to, 90° or approximately 90°. The bending angle between the first end face 1135 and the second surface 1132 can be, but not limited to, 90° or approximately 90°. The first end face 1135 can be arranged to fit the inner wall of the groove 1141 formed by the back plate 114, so as to prevent the light from being emitted from the end face of the reflector 113 and reducing the light utilization efficiency, thereby ensuring that the light reflected and reinforced to the shadow of the backlight module 11 is sufficient, thereby effectively solving the problem of poor shadow produced by the backlight module 11.

[0078] The second end face 1136 is disposed opposite to the first end face 1135. The second end face 1136 is bent and connected to the first surface 1131 and the second surface 1132. The bending angle between the second end face 1136 and the first surface 1131 may be, but not limited to, 90° or approximately 90°. The bending angle between the second end face 1136 and the second surface 1132 may be, but not limited to, 90° or approximately 90°. The second end face 1136 is arranged to fit the inner wall of the groove 1141 formed by the back plate 114, which can prevent the light from being emitted from the end face of the reflector 113 and reducing the utilization efficiency of the light, thereby ensuring that the light reflected and reinforced to the shadow of the backlight module 11 is sufficient, thereby effectively solving the problem of poor shadow produced by the backlight module 11.

[0079] See also Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 , Figure 6 is a partial structural schematic diagram of a cross section of a backlight module along line AA of an embodiment of the present application, Figure 7 is a partial structural schematic diagram of a cross section of a backlight module along line AA of a comparative embodiment, Figure 8 is a partially enlarged structural diagram of a backlight module according to an embodiment of the present application. Fig. 9 is a partially enlarged structural schematic diagram of a backlight module of a comparative embodiment, Fig.10 1 is a schematic diagram of light refraction of the backlight module of the embodiment of the present application. The second light emitting surface 1122 has a distribution area 1123, and the projection range of the distribution area 1123 on the light guide plate 112 at least partially covers the projection range of the reflector 113 on the light guide plate 112. The light guide plate 112 includes a light guide plate body 1124 and a plurality of grid points 1125. The plurality of grid points 1125 are arranged in the distribution area 1123.

[0080] The size range of the distribution area 1123 can be set corresponding to the area where the hot spot phenomenon occurs on the second light emitting surface 1122 of the light guide plate 112. The distribution area 1123 can be, but is not limited to, a rectangular, semicircular or other irregular shapes. It can be understood that the distribution area 1123 can be set according to the actual distribution area 1123 domain of the shadow problem, so as to solve the hot spot phenomenon problem. The shape design of the distribution area 1123 should not be a limitation on the backlight module 11 provided in this embodiment.

[0081] The light guide plate body 1124 may be, but is not limited to, a rectangular parallelepiped or substantially a rectangular parallelepiped. The light guide plate body 1124 is used to propagate light and convert a point light source into a surface light source for emission.

[0082] The number of the dots 1125 may be but is not limited to four, eight, ten or more. It can be understood that the number of the dots 1125 can be set according to the shadow problem of the backlight module 11, and the number of the dots 1125 should not be a limitation on the backlight module 11 provided in this embodiment.

[0083] The mesh dots 1125 may be, but are not limited to, two-dimensional or three-dimensional scattering mesh dots 1125, and the mesh dots 1125 may be used to change the propagation direction of light. Figure 7 ), generally, mesh dots 1125 are arranged on the bottom surface of the light guide plate 112. When light enters the light guide plate 112, it will be totally reflected on the upper and lower bottom surfaces. When the light hits the two-dimensional or three-dimensional scattering mesh dots 1125, the total reflection of the light will be destroyed, so that the light is emitted from the light exit surface of the light guide plate 112. In this embodiment ( Figure 6), the setting area of ​​the grid point 1125 is adjusted to the distribution area 1123 of the second light emitting surface 1122 of the light guide plate 112, the projection range of the distribution area 1123 on the light guide plate 112 at least partially covers the projection range of the reflective plate 113 on the light guide plate 112, that is, the reflective plate 113 and the distribution area 1123 are both set for the distribution area of ​​the hot spot phenomenon of the backlight module 11, so that the grid point 1125 and the reflective plate 113 cooperate with each other to solve the shadow problem generated by the backlight module 11. That is, in this embodiment, the mesh dots 1125 are adjusted from the traditional design of being arranged at the bottom of the light guide plate 112 to being arranged at the top of the light guide plate 112, so that the reflector 113 can transmit the light to the bottom of the light guide plate 112 and enter the light guide plate 112, thereby preventing the light emitted from the reflector 113 from being unable to enter the light guide plate 112 due to the change of propagation direction by the mesh dots 1125 at the bottom of the light guide plate 112. The mesh dots 1125 are arranged on the second light exiting surface 1122 of the light guide plate 112, so that the distribution of the mesh dots 1125 can be used to adjust the light exiting condition of the light guide plate 112 in the shadow area, thereby solving the Hotspot phenomenon of the backlight module 11, so that the backlight module 11 can also achieve a uniform and good display effect in the application scenario of a narrow frame.

[0084] Please refer again Figure 6 , Figure 7 , Figure 8 and Fig. 9 There are multiple light-emitting units 111, and there are gaps between the multiple light-emitting units 111. The distribution area 1123 includes multiple first sub-distribution areas 112a and multiple second sub-distribution areas 112b. The first sub-distribution area 112a is set corresponding to the light-emitting unit 111. The second sub-distribution area 112b is set corresponding to the gap between two adjacent light-emitting units 111. The density of the dots 1125 located in the first sub-distribution area 112a is greater than the density of the dots 1125 located in the second sub-distribution area 112b.

[0085] There are a plurality of light emitting units 111 , and there are gaps between the plurality of light emitting units 111 . The gaps between the plurality of light emitting units 111 may be, but are not limited to, equal or substantially equal.

[0086] The first sub-distribution area 112a is arranged corresponding to the light-emitting unit 111. The first sub-distribution area 112a can be but is not limited to being arranged directly opposite or approximately directly opposite to the light-emitting surface of the light-emitting unit 111, and the first sub-distribution area 112a can be but is not limited to having a size range along the arrangement direction of the light-emitting unit 111 that is equal to or approximately equal to the size range of the light-emitting unit 111, that is, the first distribution area 1123 is arranged in the bright area of ​​the backlight module 11 that generates the Hotspot area.

[0087] The second sub-distribution area 112b is set corresponding to the gap between two adjacent light-emitting units 111. The second sub-distribution area 112b can be but is not limited to being set directly opposite or approximately directly opposite to the gap between two adjacent light-emitting units 111, and the second sub-distribution area 112b can be but is not limited to having a size range along the arrangement direction of the light-emitting units 111 that is equal to or approximately equal to the size range of the gap between the two adjacent light-emitting units 111, that is, the second sub-distribution area 112b is set in the dark area of ​​the backlight module 11 that generates the hot spot area.

[0088] In this embodiment, the density of the dots 1125 located in the first sub-distribution area 112a is greater than the density of the dots 1125 located in the second sub-distribution area 112b. Fig. 9 ), in order to solve the problem of hot spot shadow, the grid points 1125 are arranged on the side of the light guide plate 112 close to the back plate 114, and the density of the grid points 1125 arranged in the hot spot bright area is less than the density of the grid points 1125 arranged in the hot spot dark area. The light in the light guide plate 112 is reflected to the grid points 1125, which will change the propagation path and be emitted through the second light emitting surface 1122, that is, the distribution of the grid points 1125 in the hot spot dark area is denser, so that the light guide plate 112 emits more light in the dark area to enhance the light in the dark area, and the distribution of the grid points 1125 in the hot spot bright area is sparse, so that the light guide plate 112 emits less light in the bright area to weaken the light in the bright area. However, the effect is still not ideal, and the hot spot shadow phenomenon still exists. In the schematic diagram provided in this embodiment ( Figure 8), the dots 1125 are arranged on the side of the light guide plate 112 away from the back plate 114, and the density of the dots 1125 located in the first sub-distribution area 112a is greater than the density of the dots 1125 located in the second sub-distribution area 112b, so as to utilize the characteristic of the dots 1125 to change the propagation direction of light to cooperate with the reflector 113 to solve the hot spot shadow problem. The light in the light guide plate 112 is reflected to the grid points 1125, which changes the propagation path and enters the light guide plate 112 again. The density of the grid points 1125 in the first sub-distribution area 112a is relatively large, that is, the distribution of the grid points 1125 in the hot spot bright area is denser, so that the light in the light guide plate 112 is more scattered in the hot spot bright area and enters the light guide plate 112 again. The density of the grid points 1125 in the second sub-distribution area 112b is relatively small, that is, the distribution of the grid points 1125 in the hot spot dark area is sparse, so that the light in the light guide plate 112 can easily pass through the hot spot dark area to be emitted. The design of the distribution of the dots 1125 cooperates with the light reinforcement of the reflector 113 in the hot spot area, so that the backlight module 11 can obtain sufficient light supplement in the hot spot dark area and balance the light in the hot spot bright area, so that the hot spot shadow problem of the backlight module 11 is effectively solved, and the light utilization efficiency is fully improved, so that the backlight module 11 can be applied to the product design with an extremely narrow frame and ensure that the backlight module 11 has a uniform display effect.

[0089] See also Fig.11 , Fig.11 It is a partially enlarged structural schematic diagram of a backlight module of an embodiment of the present application. The backlight module 11 also includes a frame 115, and the orthographic projection of the frame 115 on the second light emitting surface 1122 of the light guide plate 112 partially covers the second light emitting surface 1122 of the light guide plate 112. The light guide plate 112 has a first direction, and the first direction is the direction in which the light-emitting unit 111 points to the light guide plate 112. The area covered by the orthographic projection of the frame 115 on the second light emitting surface 1122 has a size range of L1 along the first direction, and the size range of the distribution area 1123 along the first direction is L2, and L1 satisfies: L1≤L2 / 3.

[0090] The material of the frame 115 may be, but is not limited to, plastic, metal or other composite materials, etc. The orthographic projection of the frame 115 on the second light emitting surface 1122 of the light guide plate 112 covers the second light emitting surface 1122 of the light guide plate 112, so as to accommodate and fix the light emitting unit 111 and the light guide plate 112, etc.

[0091] The light guide plate 112 has a first direction D1, which is a direction in which the light emitting unit 111 points to the light guide plate 112. The first direction may be, but is not limited to, parallel to or substantially parallel to the second light emitting surface 1122 of the light guide plate 112.

[0092] The size range of the distribution area 1123 along the first direction is L2. The size range L2 of the distribution area 1123 along the first direction may be, but is not limited to, a size range equal to or approximately equal to the size range of the area where the backlight module 11 generates the hot spot shadow along the first direction. The size range of the area where the orthographic projection of the frame 115 on the second light emitting surface 1122 covers the second light emitting surface 1122 along the first direction is L1, and L1 may be, but is not limited to, equal to L2 / 3, or L2 / 4, or L2 / 5 or other sizes, and L1 satisfies: L1≤L2 / 3. The backlight module 11 can effectively improve the light utilization efficiency through the design of the reflector 113 and the grid 1125, and effectively solve the problem of the hot spot shadow of the backlight module 11, so that the backlight module 11 can meet the application requirements of ultra-narrow frame display products while having excellent display effects.

[0093] See also Fig.12 , Fig.12 The embodiment of the present invention further provides a display device 10 , which includes a display panel 12 and a backlight module 11 , wherein the backlight module 11 is disposed on one side of the display panel 12 and is used to provide a surface light source to the display panel 12 .

[0094] The display device 10 may be, but is not limited to, a liquid crystal display (LCD) or the like. The display device 10 includes a display panel 12 and a backlight module 11. The backlight module 11 is disposed on one side of the display panel 12 and is used to provide a surface light source to the display panel 12. The display panel 12 may be used to receive the surface light source provided by the backlight module 11 and display a picture.

[0095] The backlight module 11 includes a light-emitting unit 111, a light guide plate 112, a reflective plate 113 and a back plate 114. The preparation method of the backlight module 11 may include but is not limited to: first, a groove is made on the back plate 114 corresponding to the gap between the light guide plate 112 and the light-emitting unit 111 to obtain the groove 1141, and the groove 1141 may not penetrate the back plate 114, so as to prevent the backlight module 11 from leaking light. Second, a reflective plate 113 is provided, and the reflective plate 113 may be but is not limited to a design with a U-shaped cross section, and the reflective plate 113 is installed in the groove 1141 of the back plate 114. Third, a light-emitting unit 111 and a light guide plate 112 are provided, and the light-emitting unit 111 and the light guide plate 112 are attached. There may be multiple light-emitting units 111, and the multiple light-emitting units 111 form a light bar assembly. The light guide plate 112 may be provided with dots 1125 on a side away from the back plate 114 and in an area corresponding to the reflective plate 113 .

[0096] In this embodiment, the reflector 113 of the backlight module 11 utilizes the total reflection principle of light to reinforce the light to the shadow of the backlight module 11 through multiple reflections, thereby effectively solving the problem of poor shadow. Compared with the traditional design, the backlight module 11 effectively improves the light utilization efficiency, thereby reducing the number of light-emitting units 111, thereby reducing the manufacturing cost of the light-emitting unit 111 assembly, thereby enabling the display device 10 to meet the demand for reducing manufacturing costs and the demand for the display device 10 to have an extremely narrow frame, and enabling the display device 10 to still have excellent optical taste in the application scenario of the extremely narrow frame.

[0097] See also Fig.13 , Fig.13 The embodiment of the present invention further provides an electronic device 1 , the electronic device 1 comprising a housing 20 and the display device 10 , the housing 20 being used to accommodate the display device 10 .

[0098] The electronic device 1 may be, but is not limited to, a mobile phone, a watch, a tablet computer (Tablet Personal Computer, Tablet PC), a notebook computer (Notebook, NB), a television (Television, TV), or other portable electronic devices 1, etc. The material of the housing 20 may be, but is not limited to, plastic, metal, alloy, or other composite materials, etc., which are not limited here. The housing 20 is used to accommodate the display device 10. The display device 10 can effectively solve the problem of poor hot spot shadows by applying the backlight module 11, so that the display device 10 can meet the design requirements of an extremely narrow frame and have a uniform and good display effect, so that the electronic device 1 can meet the design requirements of an extremely narrow frame while having an excellent display effect.

[0099] Mentioning "embodiment" and "implementation method" in this application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrases in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments. In addition, it should also be understood that the features, structures or characteristics described in the various embodiments of the present application can be arbitrarily combined to form another embodiment that does not deviate from the spirit and scope of the technical solution of the present application, provided that there is no contradiction between them.

[0100] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the above preferred implementation modes, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A backlight module, characterized in that: The backlight module comprises: A light emitting unit, wherein the light emitting unit has a first light emitting surface, and the first light emitting surface is used for emitting light; A light guide plate, the light guide plate having a light incident surface and a second light emitting surface, the light incident surface is disposed adjacent to the first light emitting surface and is used to receive light emitted from the first light emitting surface, the second light emitting surface is bent and connected to the light incident surface, and the second light emitting surface is used to emit light; and a reflector, the reflector being disposed on a side of the light guide plate away from the second light emitting surface, and at least part of the reflector being disposed directly opposite to the light emitting unit, for reflecting light emitted from the first light emitting surface to the light guide plate; A back plate, the back plate is arranged on a side of the light guide plate away from the second light emitting surface, the back plate is used to accommodate the light emitting unit, the light guide plate and the reflector, and the back plate has a groove, the groove is used to accommodate and fix the reflector; Wherein, the reflector comprises: A reflective body, wherein the reflective body has a first surface and a second surface, the first surface faces the light guide plate, the first surface is used to transmit light, and the second surface is arranged opposite to the first surface, and is used to reflect the light incident from the first surface to the reflective plate to the light guide plate; the reflective plate is also arranged partially corresponding to the light guide plate, the first surface includes a first sub-surface, a second sub-surface and a third sub-surface arranged in sequence along a direction away from the light-emitting unit, the first sub-surface is at least partially opposite to the light-emitting unit, and the third sub-surface is at least partially opposite to the light guide plate; and A light shielding layer is disposed on the first surface and the light shielding layer is disposed on the second sub-surface.

2. The backlight module according to claim 1, characterized in that: The first sub-surface and the third sub-surface are both exposed on the back plate, the first sub-surface is flush with the surface of the back plate where the groove is set or the first sub-surface is recessed in the surface of the back plate where the groove is set, and the third sub-surface is flush with the surface of the back plate where the groove is set or the third sub-surface is recessed in the surface of the back plate where the groove is set.

3. The backlight module according to claim 1, wherein: The reflector also includes: A first end surface, the first end surface is bent and connected to the first surface and the second surface, and the first surface and the second surface are both arranged on the same side of the first end surface, and the first end surface is attached to the back plate to form an inner wall of the groove; and The second end face is arranged opposite to the first end face, the second end face is bent and connected to the first surface and the second surface, and the first surface and the second surface are both arranged on the same side of the second end face, and the second end face is attached to the back plate to form the inner wall of the groove.

4. The backlight module according to claim 1, wherein: The second light emitting surface has a distribution area, and the projection range of the distribution area on the light guide plate at least partially covers the projection range of the reflector on the light guide plate; the light guide plate comprises: a light guide plate body; and A plurality of network points are arranged in the distribution area.

5. The backlight module according to claim 4, characterized in that: There are a plurality of light-emitting units, and there are gaps between the plurality of light-emitting units; The distribution area includes a plurality of first sub-distribution areas and a plurality of second sub-distribution areas, the first sub-distribution areas are arranged corresponding to the light-emitting units, and the second sub-distribution areas are arranged corresponding to the gaps between two adjacent light-emitting units; The density of the dots located in the first sub-distribution area is greater than the density of the dots located in the second sub-distribution area.

6. The backlight module according to claim 4, characterized in that: The backlight module also includes: A frame, wherein an orthographic projection of the frame on the second light emitting surface of the light guide plate covers the second light emitting surface of the light guide plate; The light guide plate has a first direction, which is the direction in which the light-emitting unit points to the light guide plate, the orthographic projection of the frame on the second light-emitting surface covers an area of ​​the second light-emitting surface with a size range of L1 along the first direction, and the size range of the distribution area along the first direction is L2, and L1 satisfies: L1≤L2 / 3.

7. A display device, characterized in that: The display device comprises a display panel and a backlight module as claimed in any one of claims 1 to 6, wherein the backlight module is arranged at one side of the display panel and is used to provide a surface light source for the display panel.

8. An electronic device, characterized in that: The electronic device comprises a housing and the display device as claimed in claim 7, wherein the housing is used to accommodate the display device.

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