Backlight module and display device

Abstract

The present application belongs to the field of display technology, and specifically relates to a backlight module and a display device. The backlight module includes a backplate, a light source assembly, and a diffuser plate. The backplate is provided with a receiving groove and a supporting platform. The light source assembly is provided in the receiving groove. The diffuser plate is supported on the supporting platform. The diffuser plate is provided on the light-emitting side of the light source assembly. The backlight module also includes a dimming structure. The dimming structure is provided on the side of the diffuser plate close to the light source assembly. The dimming structure includes a plurality of dimming units arranged in an array. Each dimming unit includes a dimming body and a dimming component. The dimming body is connected to the diffuser plate. The dimming component is provided on the side wall of the dimming body. The light emitted by the light source assembly passes through the dimming component and the dimming body toward the diffuser plate. The dimming component can adjust the amount of light emitted from the light source assembly into the dimming unit. This solution can reduce costs and achieve dynamic adjustment of contrast.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to a backlight module and a display device. Background Art

[0002] Since the liquid crystal in the LCD panel itself does not have luminous properties, in order to achieve the display effect, it is necessary to provide the LCD panel with a light source device, such as a backlight module, to provide the LCD panel with a full-surface light source with sufficient grayscale and uniform distribution. Current backlight modules are divided into side-type backlight modules and direct-type backlight modules according to their structure. Among them, the side-type backlight module is composed of a light source set on the side of the light guide plate. The side-type backlight module is always in a luminous state and continuously transmits light to the display panel. The direct-type backlight module uses multiple light-emitting elements directly set on the bottom surface of the light guide plate.

[0003] With the development of liquid crystal display technology, high dynamic contrast ratio is becoming more and more popular. However, there are still some problems such as high cost and poor dynamic effect. Summary of the Invention

[0004] The purpose of this application is to provide a backlight module and a display device that can reduce costs and achieve dynamic adjustment of contrast.

[0005] In a first aspect, the present application provides a backlight module, comprising a backplate, a light source assembly, and a diffuser plate, wherein the backplate is provided with a receiving groove and a supporting platform, the light source assembly is provided in the receiving groove, the diffuser plate is supported on the supporting platform, and the diffuser plate is provided on the light emitting side of the light source assembly; the backlight module further comprises:

[0006] The dimming structure is arranged on the side of the diffuser plate close to the light source assembly. The dimming structure includes a plurality of dimming units arranged in an array. Each of the dimming units includes a dimming body and a dimming component. The dimming body is connected to the diffuser plate. The dimming component is arranged on the side wall of the dimming body. The light emitted by the light source assembly passes through the dimming component and the dimming body toward the diffuser plate. The dimming component can adjust the amount of light emitted by the light source assembly into the dimming unit.

[0007] In an exemplary embodiment of the present application, a cross-sectional area of ​​the dimming unit gradually increases in a direction from the light source assembly to the diffusion plate.

[0008] In an exemplary embodiment of the present application, the dimming element includes:

[0009] A movable layer is parallel to the side wall surface of the dimming body, and the movable layer can move in the extension direction thereof;

[0010] a light shielding sheet, wherein a plurality of light shielding sheets are provided between the movable layer and the side wall surface, one end of the light shielding sheet is connected to the side wall surface, and the other end is connected to the side of the movable layer away from the light source assembly, adjacent light shielding sheets are provided at intervals, and at least one side of the light shielding sheet is a reflective surface;

[0011] The light shielding sheet can be deformed during the movement of the moving layer to adjust the amount of light emitted from the light source assembly to the dimming body.

[0012] In an exemplary embodiment of the present application, two opposite surfaces of the light shielding sheet are both reflective surfaces;

[0013] The light shielding sheet can be deflected during the movement of the moving layer, and the reflective surface of the light shielding sheet gradually moves toward or away from one side of the light source assembly.

[0014] In an exemplary embodiment of the present application, the dimming element further includes a piezoelectric ceramic, and the piezoelectric ceramic is provided at one end of the moving layer close to the diffuser plate;

[0015] The backlight module further includes a driving layer, which is arranged on a side of the diffusion plate close to the light source assembly;

[0016] The piezoelectric ceramic can push or pull the moving layer to move toward a side away from or close to the diffusion plate under the action of the driving layer.

[0017] In an exemplary embodiment of the present application, the dimming body includes:

[0018] A fixed layer is connected to the diffuser plate, the fixed layer has at least three side walls, the at least three side walls are connected to one end away from the diffuser plate, and the at least three side walls are all provided with the dimming elements, and the dimming elements on adjacent side walls are spaced apart from each other.

[0019] In an exemplary embodiment of the present application, the dimming body further includes:

[0020] The limiting portion is arranged on a side of the fixing layer close to the light source assembly, and the limiting portion includes a connecting block and a limiting block. One end of the connecting block is connected to the vertex of the fixing layer and extends toward one side of the light source assembly. The limiting block is arranged on a side of the connecting block away from the vertex of the fixing layer, and the limiting block extends in the horizontal direction.

[0021] In an exemplary embodiment of the present application, the fixed layer and the movable layer include transparent polycarbonate.

[0022] In an exemplary embodiment of the present application, the light shielding sheet includes white high-reflective polyethylene terephthalate.

[0023] A second aspect of the present application provides a display device, comprising:

[0024] Display panel;

[0025] In any of the above-mentioned backlight modules, the display panel is arranged on a side of the dimming unit away from the light source assembly, and is adhesively connected to the back plate.

[0026] The backlight module and display device of the present application have at least the following beneficial effects:

[0027] The backlight module of the present application includes a backplate, a light source assembly, a diffusion plate and a dimming structure. The dimming structure is arranged on the side of the diffusion plate close to the light source assembly. The dimming structure includes a plurality of dimming units arranged in an array. Each dimming unit includes a dimming body and a dimming component. The dimming component is arranged on the side wall of the dimming body. The light emitted by the light source assembly passes through the dimming component and is emitted into the dimming body, and is emitted from the bottom of the dimming body to the diffusion plate. The dimming component can adjust the amount of light emitted by the light source assembly into the dimming body. By controlling the amount of light emitted by each dimming unit and adjusting the brightness of each dimming unit, a high dynamic contrast ratio can be achieved. In addition, by not controlling the brightness of each area through the lamp beads in the light source assembly, the number of lamp beads in the light source assembly can be reduced, thereby reducing costs.

[0028] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0031] Figure 1 A schematic cross-sectional structure diagram of the backlight module and the display panel provided in the first or second embodiment of the present application is shown.

[0032] Figure 2 It shows the path of the light provided in the first or second embodiment of the present application emitted through the dimming unit.

[0033] Figure 3 A schematic cross-sectional structure diagram of the dimming unit provided in Embodiment 1 or Embodiment 2 of the present application is shown.

[0034] Figure 4 A structural schematic diagram of the dimming unit provided in the first or second embodiment of the present application in a fully light-transmitting state is shown.

[0035] Figure 5 A structural schematic diagram of the dimming unit provided in Example 1 or Example 2 of the present application is shown in a completely shading state.

[0036] Figure 6 Shown Figure 3 A schematic diagram of the cross-sectional structure of the light shielding plate located between the moving layer and the fixed layer.

[0037] Figure 7 Shown Figure 3 Schematic diagram of the cross-sectional structure of the connection between the fixed layer and the limiting part at B in the middle.

[0038] Description of reference numerals:

[0039] 1. Display device; 10. Backlight module; 100. Back panel; 110. Receiving groove; 120. Carrying platform; 200. Light source assembly; 210. Lamp board; 220. Lamp beads; 300. Diffuser; 400. Dimming structure; 410. Dimming unit; 411. Dimming body; 4110. Fixed layer; 4111. Limiting part; 41110. Connecting block; 41111. Limiting block; 412. Dimming element; 4120. Moving layer; 4121. Shading sheet; 4122. Piezoelectric ceramics; 500. Optical film; 20. Display panel. DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0041] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0042] In this application, unless otherwise specified or limited, terms such as "assembly" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0043] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0044] Example 1

[0045] See Figure 1 As shown, the first embodiment of the present application provides a backlight module 10, which can be a direct-lit backlight module 10. The backlight module 10 includes a back plate 100, a light source assembly 200, and a diffuser plate 300. The back plate 100 is provided with a receiving groove 110 and a supporting platform 120. The light source assembly 200 is disposed in the receiving groove 110 of the back plate 100. The diffuser plate 300 is adhesively fixed to the supporting platform 120. The diffuser plate 300 is disposed on the light-emitting side of the light source assembly 200, that is, the diffuser plate 300 is disposed above the light source assembly 200.

[0046] Among them, see Figure 1 As shown, the light source assembly 200 includes a lamp board 210 and lamp beads 220 arranged in an array on the lamp board 210. The lamp beads 220 can be sub-millimeter light emitting diodes (Mini Light Emitting Diode Display, mini LED) lamp beads 220, light emitting diodes (Light Emitting Diode Display, LED) lamp beads 220, or micro light emitting diodes (Micro Light Emitting Diode Display, micro LED) lamp beads 220. Of course, other types of lamp beads 220 can also be used, and the present invention is not limited to these.

[0047] In the embodiment of the present application, the backlight module 10 further includes a dimming structure 400, which is disposed on a side of the diffuser 300 close to the light source assembly 200. That is, the light emitted by the light source assembly 200 first passes through the dimming structure 400 before entering the diffuser 300.

[0048] Among them, see Figure 1 and Figure 2 As shown, the dimming structure 400 includes a plurality of dimming units 410 arranged in an array. Adjacent dimming units 410 are interconnected to ensure that the light emitted by the light source assembly 200 first enters the dimming structure 400 and then enters the diffusion plate 300 .

[0049] In the examples of this application, see Figure 3 As shown, each dimming unit 410 can use the same structure to facilitate brightness adjustment and prevent uneven brightness. Each dimming unit 410 includes a dimming body 411 and a dimming element 412. The dimming body 411 is connected to the diffuser 300. The dimming element 412 is located on the side wall of the dimming body 411 and can adjust the amount of light entering the dimming body 411.

[0050] The solution of the present application can adjust the amount of light entering the diffuser 300 through the dimming element 412, and then can switch between multiple contrasts to achieve high dynamic contrast.

[0051] It should be understood that traditional mini LEDs use one lamp bead 220 to control a specific area, using the brightness of the display to be controlled by the dimming of the lamp bead 220. However, this solution controls the brightness of each subarea by controlling the dimming element 412, eliminating the need for lamp bead 220 to control the brightness of each subarea. This reduces the number of lamp beads 220 and reduces costs. Furthermore, the dimming element 412 can brighten the area where the image needs to be displayed, while dimming areas where it doesn't need to be displayed, resulting in a more detailed and effective display.

[0052] In the examples of this application, see Figure 2 As shown, the cross-sectional area of ​​the dimming unit 410 gradually increases in the direction from the light source assembly 200 to the diffusion plate 300. That is, in the vertically upward direction, the cross-sectional area of ​​the dimming unit 410 gradually increases, and this structure can concentrate light.

[0053] See Figure 4 and Figure 5As shown, in order to adjust the amount of light entering the dimming body 411, the dimming element 412 includes a movable layer 4120 and a light shielding plate 4121. The movable layer 4120 is parallel to the side wall surface of the dimming body 411. The movable layer 4120 can move in its extension direction, that is, the movable layer 4120 can move in a direction parallel to the side wall surface. A plurality of light shielding plates 4121 are arranged between the movable layer 4120 and the side wall surface, one end of each light shielding plate is connected to the side wall surface, and the other end is connected to the side of the movable layer 4120 away from the light source assembly 200. Adjacent light shielding plates 4121 are spaced apart from each other, and at least one side of each light shielding plate 4121 is a light-emitting surface.

[0054] In an embodiment of the present application, the light shielding film 4121 can be deformed during the movement of the movable layer 4120 to control the movement of the reflective surface toward or away from the light source assembly 200, thereby controlling the amount of light emitted from the light source assembly 200 into the dimming body 411.

[0055] In the embodiment of the present application, the dimming unit 410 has at least a completely light-transmitting state and a completely light-shielding state. Figure 4 As shown, when the dimming unit 410 is in a fully light-transmitting state, the light shielding member is perpendicular to the sidewalls of the movable layer 4120 and the dimming body 411, forming a light transmission area between adjacent light shielding members. The light emitted by the light source assembly 200 to the dimming unit 410 completely passes through this transmission area and enters the dimming body 411, and then completely enters the diffuser 300. At this time, the amount of light is maximized. Figure 5 As shown, when the dimming unit 410 is in a completely shading state, the reflective surface of the shading member faces the side of the light source assembly 200, and the light emitted from the light source assembly 200 to the dimming unit 410 will be reflected by the reflective surface of the shading member. The light cannot enter the dimming body 411, and further cannot pass through the diffuser 300 and enter the display panel 20.

[0056] It is understood that the dimming unit 410 can also have other different states. In different states, different amounts of light can pass through the dimming body 411. By driving the deformation of the light shielding sheet 4121 through the movable layer 4120, it can switch between various states and thus control the amount of light output, thereby achieving dynamic control of the backlight brightness.

[0057] By controlling the amount of light passing through the dimming element 412 , the backlight brightness of each area can be precisely controlled, resulting in higher contrast, better picture display, and better effects.

[0058] In the embodiment of the present application, the two opposing side surfaces of the light shielding sheet 4121 are both reflective surfaces. The light shielding sheet 4121 can be deflected during the movement of the movable layer 4120, with the reflective surface of the light shielding sheet 4121 gradually moving toward or away from one side of the light source assembly 200. In other words, whether the movable layer 4120 moves diagonally upward or downward, the light shielding sheet 4121 can adjust the amount of light entering the dimming body 411.

[0059] In the embodiment of the present application, in order to drive the moving layer 4120 to move, the dimming element 412 also includes a piezoelectric ceramic 4122, and the backlight module 10 also includes a driving layer. This driving layer can drive the piezoelectric ceramic 4122 to expand and contract, thereby driving the moving layer 4120 to move in an oblique upward trajectory.

[0060] In the examples of this application, see Figure 6 As shown, the piezoelectric ceramic 4122 is positioned at one end of the movable layer 4120 near the diffuser plate 300. One end of the piezoelectric ceramic 4122 is connected to the movable layer 4120, and the other end is electrically connected to the drive layer. The drive layer can be fabricated using printed copper wires, which can be used to energize the piezoelectric ceramic 4122, enabling it to expand and contract. Because the piezoelectric ceramic 4122 is fixedly connected to the movable layer 4120, the movable layer 4120 can determine its own movement path based on the expansion and contraction path of the piezoelectric ceramic 4122.

[0061] For example, when the dimming unit 410 is in a fully light-transmitting state, when the piezoelectric ceramic 4122 contracts / extends toward the side of the diffuser plate 300, it will drive the movable layer 4120 to gradually move toward / away from the side of the diffuser plate 300, and the shading sheet 4121 gradually deflects up / down, and the reflective surface on one side of the shading sheet 4121 gradually moves toward the side toward the light source assembly 200, and the reflective surface gradually faces the side of the light source assembly 200. The reflective surface reflects the light, and the amount of light that can enter the dimming body 411 gradually decreases. When the dimming unit 410 is in a completely shading state, when the piezoelectric ceramic 4122 stretches / contracts toward the side of the diffuser plate 300, it will drive the movable layer 4120 to gradually move away from / close to the side of the diffuser plate 300, and the shading sheet 4121 gradually deflects downward / upward, and the reflective surface on one side of the shading sheet 4121 gradually moves toward the side away from the light source assembly 200, and the amount of light that can enter the dimming body 411 gradually increases.

[0062] It is worth mentioning that the driving layer is disposed on a side of the diffusion plate 300 close to the light source assembly 200 so as to be electrically connected to the piezoelectric ceramic 4122 .

[0063] In addition, the piezoelectric ceramic 4122 in each dimming unit 410 can be connected to different driving switches, so that each dimming unit 410 can adjust the required brightness according to needs.

[0064] In the examples of this application, see Figures 2 to 4 As shown, the dimming body 411 includes a fixed layer 4110, which is connected to the diffuser 300. The fixed layer 4110 has at least three sidewalls, which are connected at one end away from the diffuser 300. To ensure the dimming effect, each sidewall is equipped with a dimming element 412. When light strikes each sidewall, the dimming element 412 can adjust the amount of light entering the dimming body 411, allowing for more precise adjustment of image brightness and improving the display quality.

[0065] In the examples of this application, see Figure 2 As shown, the dimming unit 410 has a quadrangular pyramid structure, that is, the fixed layer 4110 includes four edges (sidewall surfaces), and the above-mentioned dimming components 412 are provided on the four edges. Each edge can adjust the amount of light emitted by the light source assembly 200.

[0066] It is understandable that the more facets the dimming unit 410 has, the finer the dimming effect, resulting in a better dimming effect and more uniform light emitted into the dimming body 411 .

[0067] In addition, in order to prevent adjacent dimming elements 412 from colliding during the dimming process, the dimming elements 412 on each side wall are spaced apart from each other.

[0068] In the examples of this application, see Figure 7 As shown, the dimming body 411 also includes a limiting portion 4111, which is disposed on the side of the fixed layer 4110 close to the light source assembly 200. The limiting portion 4111 includes a connecting block 41110 and a limiting block 41111. One end of the connecting block 41110 is connected to the vertex of the fixed layer 4110 and extends toward one side of the light source assembly 200, that is, the connecting block 41110 extends downward. The limiting block 41111 is disposed on the side of the connecting block 41110 away from the vertex of the fixed layer 4110. The limiting block 41111 extends horizontally. The limiting block 41111 can prevent collisions between adjacent movable layers 4120, thereby ensuring the integrity of the movable layer 4120 and, thus, the dimming effect.

[0069] In the embodiment of the present application, the fixed layer 4110 and the movable layer 4120 include transparent polycarbonate, so as to ensure that light can pass through the fixed layer 4110 and the movable layer 4120 and be emitted into the diffuser 300, thereby ensuring the amount of light.

[0070] That is to say, the fixed layer 4110 and the movable layer 4120 can be made of transparent polycarbonate material.

[0071] In the embodiment of the present application, the fixing layer 4110 and the diffusion plate 300 can be bonded together using a transparent adhesive.

[0072] In the embodiment of the present application, the light shielding film 4121 includes white high-reflective polyethylene terephthalate to achieve reflection of light.

[0073] That is, the light shielding film 4121 can be made of white high-reflective polyethylene terephthalate.

[0074] It is worth mentioning that the light shielding sheet 4121 can be connected to the fixed layer 4110 and the movable layer 4120 by thermal welding.

[0075] It is understandable that since the light shielding sheet 4121 can be made of white high-reflectivity polyethylene terephthalate, which has the characteristics of being soft, having a certain degree of stiffness and toughness, it will not break as the moving layer 4120 moves.

[0076] In the embodiment of the present application, since the dimming unit 410 can adjust the amount of light emitted by the light source assembly 200 to the display panel 20, and the dimming unit 410 is arranged on the side of the diffuser 300 close to the light source assembly 200, the closer the dimming unit 410 is to the display panel 20, the smaller the scattering area of ​​the light on the display panel 20, thereby reducing the generation of halo.

[0077] In the examples of this application, see Figure 1 As shown, the backlight module 10 further includes an optical film 500 . The optical film 500 is disposed on a side of the diffusion plate 300 away from the light source assembly 200 to improve optical performance.

[0078] The present application adjusts the amount of light emitted from the light source assembly 200 to the diffuser plate 300 by the dimming element 412 in the dimming unit 410, thereby dynamically controlling the brightness of the backlight module 10 and achieving high dynamic contrast. By controlling the brightness of each partition by controlling the adjustment element, the number of lamp beads 220 in the light source assembly 200 can be reduced, thereby reducing costs. In addition, the dimming unit 410 can be used to accurately illuminate the desired display screen, making the brightness of the desired display screen brighter and improving the display effect. Moreover, the dimming unit 410 is designed on the side of the diffuser plate 300 close to the light source assembly 200. The closer the dimming unit 410 is to the display panel 20, the smaller the scattering area of ​​the light irradiated on the display panel 20 is, thereby avoiding the generation of halo.

[0079] Example 2

[0080] See Figure 1 As shown, the second embodiment of the present application provides a display device 1, which includes a display panel 20 and a backlight module 10 as described in any of the first embodiment. The display panel 20 is arranged on the side of the dimming unit 410 away from the light source assembly 200. Because the display panel 20 is closer to the dimming unit 410, the scattering area of ​​light on the display panel 20 is also small, which can reduce the generation of halo. In addition, the dimming unit 410 can realize switching between different contrasts, achieving high dynamic contrast adjustment.

[0081] The back plate 100 is provided with a mounting position, and the display panel 20 and the back plate 100 are connected by bonding with adhesive.

[0082] According to the embodiments of the present application, the specific type of the display device 1 is not particularly limited, and any type of display device 1 commonly used in the field can be used, such as liquid crystal displays, mobile phones, laptop computers and other mobile devices, wearable devices such as watches, VR devices, etc. Those skilled in the art can make corresponding choices based on the specific purpose of the display device, which will not be repeated here.

[0083] It should be noted that, in addition to the display panel 20, the display device 1 also includes other necessary components and components. Taking the display as an example, it may also include a main circuit board, a power cord, etc. Those skilled in the art may make corresponding supplements based on the specific usage requirements of the display device 1, which will not be repeated here.

[0084] In the description of this specification, the reference terms "some embodiments", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0085] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent application.

Claims

1. A backlight module, comprising a backplate, a light source assembly, and a diffuser plate, wherein the backplate is provided with a receiving groove and a supporting platform, the light source assembly is provided in the receiving groove, the diffuser plate is supported on the supporting platform, and the diffuser plate is provided on the light-emitting side of the light source assembly; characterized in that: The backlight module further includes: a dimming structure disposed on a side of the diffuser plate close to the light source assembly, the dimming structure comprising a plurality of dimming units arranged in an array, each dimming unit comprising a dimming body and a dimming element, the dimming body being connected to the diffuser plate, the dimming element being disposed on a sidewall of the dimming body, the light emitted by the light source assembly passing through the dimming element and the dimming body toward the diffuser plate, the dimming element being capable of adjusting the amount of light emitted from the light source assembly into the dimming unit; The dimming element includes: A movable layer is parallel to the side wall surface of the dimming body, and the movable layer can move in the extension direction thereof; a light shielding sheet, wherein a plurality of light shielding sheets are provided between the movable layer and the side wall surface, one end of the light shielding sheet is connected to the side wall surface, and the other end is connected to the side of the movable layer away from the light source assembly, adjacent light shielding sheets are provided at intervals, and at least one side of the light shielding sheet is a reflective surface; The light shielding sheet can be deformed during the movement of the moving layer to adjust the amount of light emitted from the light source assembly to the dimming body.

2. The backlight module according to claim 1, wherein: In a direction from the light source assembly to the diffusion plate, a cross-sectional area of ​​the dimming unit gradually increases.

3. The backlight module according to claim 1, wherein: The two opposite sides of the light shielding sheet are both reflective surfaces; The light shielding sheet can be deflected during the movement of the moving layer, and the reflective surface of the light shielding sheet gradually moves toward or away from one side of the light source assembly.

4. The backlight module according to claim 1, wherein: The dimming element further includes a piezoelectric ceramic, which is arranged at one end of the moving layer close to the diffusion plate; The backlight module further includes a driving layer, which is arranged on a side of the diffusion plate close to the light source assembly; The piezoelectric ceramic can push or pull the moving layer to move toward a side away from or close to the diffusion plate under the action of the driving layer.

5. The backlight module according to claim 1, wherein: The dimming body includes: A fixed layer is connected to the diffuser plate, the fixed layer has at least three side walls, the at least three side walls are connected to one end away from the diffuser plate, and the at least three side walls are all provided with the dimming elements, and the dimming elements on adjacent side walls are spaced apart from each other.

6. The backlight module according to claim 5, wherein: The dimming body also includes: The limiting portion is arranged on a side of the fixing layer close to the light source assembly, and the limiting portion includes a connecting block and a limiting block. One end of the connecting block is connected to the vertex of the fixing layer and extends toward one side of the light source assembly. The limiting block is arranged on a side of the connecting block away from the vertex of the fixing layer, and the limiting block extends in the horizontal direction.

7. The backlight module according to claim 5, wherein: The fixed layer and the moving layer include transparent polycarbonate.

8. The backlight module according to claim 7, wherein: The light shielding sheet comprises white high-reflective polyethylene terephthalate.

9. A display device, characterized in that: include: Display panel; In the backlight module according to any one of claims 1 to 8, the display panel is arranged on a side of the dimming unit away from the light source assembly and is adhesively connected to the backplate.

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