Backlight module and display device

Abstract

The application provides a backlight module and a display device. The backlight module comprises a film piece assembly and a diffusion plate. The diffusion plate is arranged on one side of the film piece assembly along the thickness direction of the film piece assembly. The diffusion plate comprises a body part and a bent part. The body part is arranged in layers with the film piece assembly. The bent part is connected to the edge of the body part. The bent part is bent in a direction away from the film piece assembly relative to the body part. The backlight module can solve the problem of uneven light emission.

Description

Technical Field

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

[0002] In existing ultra-narrow bezel display devices, the black border design of the display panel is often extremely narrow. This narrow structure makes it difficult for light to effectively reach the edge area of ​​the display panel, which adversely affects the edge display effect.

[0003] To address this issue, a layered approach is currently employed, consisting of a diaphragm assembly and a diffuser plate, with reflectors placed at their edges. These reflectors reflect light passing through the diffuser plate back to the edges of the diaphragm assembly and the display panel, ensuring that light can pass smoothly through the edge display area of ​​the display panel and achieving normal edge display.

[0004] However, the existing module architecture still has some shortcomings. In practical applications, the size of the light spot emitted from the display panel, especially in the central area, increases, the halo effect deteriorates significantly, and the overall display effect is severely reduced. Research has found that, ideally, light emitted from the diffuser should directly reach the diaphragm assembly and then be emitted. However, in the existing architecture, some light is reflected back and forth between the diffuser and the diaphragm assembly before being emitted, resulting in uneven light emission and seriously impairing display quality. Utility Model Content

[0005] This application provides a backlight module and a display device that can solve the problem of uneven light output.

[0006] This application provides a backlight module, including:

[0007] Diaphragm assembly;

[0008] A diffuser plate is disposed on one side of the diaphragm assembly along the thickness direction of the diaphragm assembly. The diffuser plate includes a body portion and a bent portion. The body portion is stacked with the diaphragm assembly. The bent portion is connected to the edge of the body portion and is bent relative to the body portion in a direction away from the diaphragm assembly.

[0009] In some embodiments, the backlight module further includes a support frame surrounding the diaphragm assembly and the diffuser plate; the support frame is recessed in a region toward the diaphragm assembly to form a first clearance space, and the edge of the diaphragm assembly extends into the first clearance space; the support frame is recessed in a region toward the bend of the diffuser plate to form a second clearance space, and at least a portion of the structure of the bend extends into the second clearance space.

[0010] In some embodiments, the support frame includes a first support portion and a second support portion, the first support portion being connected to the second support portion, the first support portion having a first clearance space, and the second support portion having a second clearance space; the first support portion also has a reflective slope extending between the diaphragm assembly and the diffuser plate, the reflective slope facing the diaphragm assembly.

[0011] In some embodiments, the second support portion has a limiting slope that is connected to the end of the reflecting slope, and the limiting slope faces the bend of the diffuser plate.

[0012] In some embodiments, the angle between the reflective slope and the plane perpendicular to the thickness direction of the backlight module is 38° to 70°.

[0013] In some embodiments, the support frame includes a third support portion connected to the side of the second support portion away from the first support portion; the backlight module further includes a back plate connected to the third support portion.

[0014] In some embodiments, the third support portion has a limiting groove on the side away from the second support portion, and the edge portion of the back plate is bent upward to form a hook portion, which engages with the limiting groove.

[0015] In some embodiments, the bend is bent away from the diaphragm assembly.

[0016] In some embodiments, the body portion and the bent portion are smoothly connected.

[0017] In some embodiments, the diffuser plate further includes an extension connected to the side of the bent portion away from the body portion, the extension extending toward the second clearance space.

[0018] This application embodiment also provides a display device, including:

[0019] Backlight module, wherein the backlight module is the aforementioned backlight module;

[0020] The display panel is disposed on the light-emitting side of the backlight module.

[0021] In some embodiments, the display device further includes a mid-frame disposed around the backlight module and the display panel, and the mid-frame is connected to the backlight module and the display panel respectively.

[0022] The backlight module and display device provided in this application include a diaphragm assembly and a diffuser plate. The diffuser plate is disposed on one side of the diaphragm assembly along its thickness direction. The diffuser plate includes a body portion and a bent portion. The body portion and the diaphragm assembly are stacked together to avoid uneven light output caused by light reflecting back and forth between the body portion and the diaphragm assembly. The bent portion bends away from the diaphragm assembly, which facilitates light propagation to the edge of the diaphragm assembly, ensuring that light passes smoothly through the edge display area of ​​the display panel and achieving normal edge display. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a first structure of a backlight module provided in an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of a second structure of the backlight module provided in an embodiment of this application.

[0026] Figure 3 This is a schematic diagram of a third structure of the backlight module provided in an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of a fourth structure of the backlight module provided in the embodiments of this application.

[0028] Figure 5 This is a schematic diagram of the structure of the display device provided in the embodiments of this application.

[0029] Figure 6 This is a schematic diagram of the fixture provided in the embodiments of this application. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] This application provides a backlight module and a display device that can solve the problem of uneven light output. The following is a detailed description with reference to the accompanying drawings.

[0032] Please see Figure 1 , Figure 1 This is a schematic diagram of the first structure of the backlight module provided in the embodiments of this application.

[0033] This application provides a backlight module 10, which provides a uniform backlight source for the display panel 20, enabling the display panel to display images normally. The backlight module 10 can uniformly diffuse and guide the light emitted by the light source to achieve a high-quality display effect.

[0034] The backlight module 10 includes a diaphragm assembly 11 and a diffuser plate 12.

[0035] In the backlight module 10, the diaphragm assembly 11 is a component composed of various optical films. These optical films include, but are not limited to, brightness enhancement films and diffusion films. Brightness enhancement films can converge and reflect light through specific optical structures, thereby improving light utilization and emission brightness; diffusion films can initially diffuse light, making the light distribution more uniform. Each optical film in the diaphragm assembly 11 has specific optical properties, and by superimposing and combining them, the light propagation characteristics can be improved, such as increasing light brightness and uniformity, thereby optimizing the light emission effect of the backlight module 10.

[0036] The diffuser plate 12 is an important optical component in the backlight module 10. It is usually made of materials with good light scattering properties, such as polymethyl methacrylate (PMMA) and polystyrene (PS). The main function of the diffuser plate 12 is to uniformly diffuse the light emitted by the light source, making the light softer and more evenly distributed, reducing uneven light emission, and improving the quality of the displayed image.

[0037] The diffuser plate 12 is disposed on one side of the diaphragm assembly 11 along the thickness direction of the diaphragm assembly 11. The diffuser plate 12 includes a body portion 121 and a bending portion 122.

[0038] The body portion 121 and the diaphragm assembly 11 are stacked, for example, the body portion 121 and the diaphragm assembly 11 are attached together, which can avoid the phenomenon of uneven light output caused by light reflecting back and forth between the body portion 121 and the diaphragm assembly 11, so that light can smoothly enter the body portion 121 from the diaphragm assembly 11 and propagate and diffuse according to the preset optical path.

[0039] The bent portion 122 is connected to the edge of the body portion 121. The bent portion 122 bends away from the diaphragm assembly 11 relative to the body portion 121, which facilitates the propagation of light to the edge of the diaphragm assembly 11 and ensures that light can pass smoothly through the edge display area of ​​the display panel 20, thus achieving normal edge display. The width of the bent portion 122 can be from 1 cm to 4 cm, for example, 3 cm.

[0040] The backlight module 10 provided in this application can be applied to a display device 100 with a narrow bezel to achieve uniform and normal display of light at the edge, and can also avoid the phenomenon of light spots caused by multiple reflections of light.

[0041] The backlight module 10 provided in this application also includes a support frame 13, which is disposed around the periphery of the diaphragm assembly 11 and the diffuser plate 12.

[0042] Please see Figure 2 , Figure 2 This is a schematic diagram of a second structure of the backlight module provided in an embodiment of this application.

[0043] The area of ​​the support frame 13 facing the diaphragm assembly 11 is recessed to form a first clearance space 131. The edge of the diaphragm assembly 11 extends into the first clearance space 131. The first clearance space 131 can limit the diaphragm assembly 11 to ensure the relative positional accuracy between it and other components such as the diffuser plate 12. It can also reserve a space for the diaphragm assembly 11 to expand and contract, ensuring its normal operation under different temperature environments.

[0044] The support frame 13 is recessed in the area facing the bend 122 of the diffuser plate 12 to form a second clearance space 132. At least a portion of the structure of the bend 122 extends into the second clearance space 132, which also plays an important role in limiting movement and reserving space for expansion and contraction. Structurally, the second clearance space 132 can effectively limit the bend 122 of the diffuser plate 12, preventing the diffuser plate 12 from shaking or coming off during use. In terms of optical performance, the space reserved in the second clearance space 132 can accommodate the expansion and contraction of the diffuser plate 12 due to temperature changes.

[0045] The support frame 13 includes a first support portion 133 and a second support portion 134, which are connected. This connection can be achieved through a one-piece molding process, or by welding, snap-fit ​​connection, or other methods. The one-piece molding process has many advantages, ensuring the connection strength and integrity between the first support portion 133 and the second support portion 134, reducing stress concentration at the connection point, and improving the reliability and service life of the support frame 13.

[0046] The first support portion 133 is provided with a first clearance space 131, and the second support portion 134 is provided with a second clearance space 132. This partitioned arrangement allows the support frame 13 to be designed specifically for the different characteristics of the diaphragm assembly 11 and the diffuser plate 12, thereby better meeting the optical and structural requirements of the backlight module 10.

[0047] The first support portion 133 also has a reflective slope 1331, which extends between the diaphragm assembly 11 and the diffuser plate 12. The reflective slope 1331 faces the diaphragm assembly 11 and its function is to reflect part of the light emitted from the diffuser plate 12 to the edge of the diaphragm assembly 11, thereby increasing the brightness of the edge area of ​​the backlight module 10 and improving the uniformity of the displayed image.

[0048] The reflective capability of the reflective slope 1331 can be achieved in two ways. One way is to use white plastic as the material for the first support portion 133, as white plastic itself has a certain reflective function. The surface of the white plastic can reflect most of the incident light, reflecting the light emitted from the diffuser plate 12 that might otherwise be scattered in other directions back to the edge of the diaphragm assembly 11. The other way is to set a reflective layer on the slope of the first support portion 133. The reflective layer can be made of a high-reflectivity metal material, such as aluminum or silver, and the metal material can be uniformly deposited on the slope through processes such as evaporation or sputtering. The metal reflective layer has extremely high reflectivity, capable of reflecting almost all of the incident light.

[0049] The second support portion 134 has a limiting inclined surface 1341, which is connected to the end of the reflecting inclined surface 1331. The limiting inclined surface 1341 faces the bent portion 122 of the diffuser plate 12. The limiting inclined surface 1341 is approximately parallel to the bent portion 122 of the diffuser plate 12. The limiting inclined surface 1341 can limit the diffuser plate 12, effectively preventing the diffuser plate 12 from coming out of the second clearance space 132.

[0050] The angle between the reflective slope 1331 and the plane perpendicular to the thickness direction of the backlight module 10 is 38° to 70°. Understandably, the choice of this angle mainly depends on the distance A, which refers to the width of the limiting slope 1341 in the thickness direction perpendicular to the backlight module 10. The purpose of the distance A is to reserve a gap for the expansion and contraction of the diffuser plate 12, that is, the depth of the second clearance space 132.

[0051] In other words, when the angle of the limiting inclined surface 1341 remains unchanged, the larger the angle between the reflecting inclined surface 1331 and the plane perpendicular to the thickness direction of the backlight module 10, the smaller the distance A, and the smaller the depth of the second clearance space 132; the smaller the angle between the reflecting inclined surface 1331 and the plane perpendicular to the thickness direction of the backlight module 10, the larger the distance A, and the larger the depth of the second clearance space 132.

[0052] The reasonable design of the included angle of the reflective slope 1331, the distance A, and the depth of the second clearance space 132 is of great significance for ensuring the structural stability of the backlight module 10. If these parameters are not matched, problems such as structural loosening, component displacement, and detachment may occur in the backlight module 10 during assembly or use.

[0053] The support frame 13 includes a third support part 135, which is connected to the side of the second support part 134 away from the first support part 133 to form a stable overall structure.

[0054] The backlight module 10 also includes a back plate 14, which is connected to the third support portion 135 to fix the relative position of the back plate 14. The back plate 14 also forms a light mixing cavity, and a lamp plate 15 is mounted at the bottom of the light mixing cavity. The light emitted from the lamp plate 15 can be mixed in the light mixing cavity and then pass through the diffuser plate 12 and the diaphragm assembly 11 in sequence before finally illuminating the display panel 20.

[0055] The first support part 133, the second support part 134 and the third support part 135 can be integrally formed.

[0056] When the support frame 13 is a metal frame, the third support part 135 has sufficient strength, so the third support part 135 can also be connected to the back plate 14 by bolt fastening.

[0057] When the bracket frame is a plastic frame, the third support 135 can be connected to the back plate 14 by adhesive bonding.

[0058] The third support portion 135 has a limiting groove 1351 on the side away from the second support portion 134. The edge of the back plate 14 is bent upward to form a hook portion 141, which engages with the limiting groove 1351. The engagement of the hook portion 141 and the limiting groove 1351 forms a self-locking structure, thereby enhancing the stability of the connection. In addition, this structure of the hook portion 141 and the limiting groove 1351 also facilitates quick positioning between the back plate 14 and the support frame 13.

[0059] Please see Figure 3 , Figure 3 This is a schematic diagram of a third structure of the backlight module provided in an embodiment of this application.

[0060] The bent portion 122 bends away from the diaphragm assembly 11. As light passes through the bent portion 122 and enters the diaphragm assembly 11, the angle of incidence of the light changes continuously at different positions due to the curved shape of the bent portion 122, resulting in a corresponding change in the angle of refraction. This constantly changing angle of refraction causes the light to diverge in different directions when entering the diaphragm assembly 11, achieving a uniform distribution of light.

[0061] The smooth connection between the main body 121 and the bending part 122 can prevent the diffuser plate 12 from cracking due to stress concentration at the connection between the main body 121 and the bending part 122, and can also reduce the abrupt scattering of light at the connection.

[0062] In some cases, the main body 121 and the bent part 122 are smoothly connected by an arc-shaped transition section. The arc-shaped transition section has a softer curved shape, which can further optimize light propagation and stress distribution.

[0063] Please see Figure 4 , Figure 4 This is a schematic diagram of a fourth structure of the backlight module provided in this application embodiment. The diffuser plate 12 also includes an extension 123, which is connected to the side of the bent portion 122 away from the main body 121. The extension 123 extends into the second clearance space 132. The extension 123 can prevent the end of the bent portion 122 from being damaged by impact. In conventional diffuser plates 12, the end of the bent portion 122 lacks effective protection and is a pointed end, making it easily damaged directly by external impact. In this application, the extension 123 makes the end of the bent portion 122 planar, which is more wear-resistant. The planar structure makes the extension 123 more evenly stressed when in contact with the surrounding structure, reducing local stress concentration.

[0064] The extension 123 can be approximately parallel to a portion of the sidewall of the second clearance space 132 to increase wear resistance. When the display device 100 is subjected to external impact or assembly, the extension 123 impacts or contacts a portion of the sidewall plane within the second clearance space 132. The approximately parallel contact of the two surfaces helps to distribute the force evenly, reduces local stress concentration, and lowers the failure rate and maintenance cost of the display device 100.

[0065] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. This application provides a display device 100, which is an electronic device or component whose core function is to convert electronic signals, digital signals, or other forms of signals into visual information such as images, text, and numbers that are recognizable to the human eye. The display device 100 can be a television, computer monitor, mobile phone screen, vehicle display screen, etc.

[0066] The display device 100 includes a backlight module 10 and a display panel 20. The backlight module 10 is the same as the backlight module 10 in the above embodiment. The display panel 20 is disposed on the light-emitting side of the backlight module 10, which provides the display panel 20 with more uniform and high-brightness light emission, significantly improving the brightness uniformity and average brightness of the display device 100, and bringing users a clearer, more realistic and brighter visual experience.

[0067] The edge of the display panel 20 can overlap and be attached to the support frame 13 to be positioned on the light-emitting side of the diaphragm assembly 11.

[0068] To further improve the stability and reliability of the overlap, a stress dispersion and buffer structure is provided at the overlap between the display panel 20 and the support frame 13. Elastic materials such as rubber pads or silicone pads can be added to the overlap area. When the display panel 20 is subjected to external force, the elastic material can deform, absorb and disperse the stress, reduce the concentrated effect of stress on the display panel 20, and thus protect the display panel 20 from damage.

[0069] The display device 100 also includes a mid-frame 30, which is disposed around the backlight module 10 and the display panel 20. The mid-frame 30 is connected to the backlight module 10 and the display panel 20, respectively, for example, by adhesive bonding. The mid-frame 30 plays an important supporting and protective role. The shape and size of the mid-frame 30 are precisely designed according to the shape of the backlight module 10 and the display panel 20, so as to fit them tightly and provide uniform support. When subjected to external impact, the mid-frame 30 can disperse stress and prevent the backlight module 10 and the display panel 20 from being damaged due to excessive local stress.

[0070] Please see Figure 6 , Figure 6 This is a schematic diagram of the fixture provided in the embodiments of this application.

[0071] This application embodiment also provides a jig 200 for preparing the aforementioned diffuser plate 12. The jig 200 includes a support base 21, a fixed mold component 22, a guide post 23, and a movable mold component 24. The support base 21 provides a stable support platform for the diffuser plate 12 by filling the parts of the diffuser plate 12 that do not need to be bent, effectively preventing deformation of the diffuser plate 12 during processing and ensuring the flatness and dimensional accuracy of the diffuser plate 12.

[0072] The fixed mold part 22 is connected to the support base 21, providing a fixed molding boundary for the fixture 200. The guide post 23 is fixed to the fixed mold part 22, and the movable mold part 24 is sleeved on the guide post 23 and slidably connected to it. The guide post 23 ensures the accuracy and stability of the movable mold part 24 during movement. During the processing of the diffuser plate 12, the movable mold part 24 needs to move along a predetermined trajectory, precisely matching the fixed mold part 22 to form a suitable mold cavity.

[0073] A mold cavity is formed between the moving mold part 24 and the fixed mold part 22, and the edge of the diffuser plate 12 is placed inside the mold cavity. During processing, the diffuser plate 12 will bend as expected due to the squeezing action of the moving mold part 24 and the fixed mold part 22.

[0074] The moving mold 24 can move towards the fixed mold 22 under the action of the power device, and the diffuser plate 12 is gradually compressed and deformed. Due to the boundary constraints of the mold cavity, the diffuser plate 12 will deform and bend according to the shape of the mold cavity. For example, if it is necessary to bend the diffuser plate 12 to a certain angle, the corresponding part of the mold cavity will be designed with a corresponding angle. When the diffuser plate 12 enters the mold cavity, it will form the required bending angle under the extrusion of the mold.

[0075] The moving mold 24 and the fixed mold 22 can be made of aluminum, which has good thermal conductivity; and aluminum has a low density, so it is lighter in weight for the same volume.

[0076] During the preparation of diffuser plate 12, the mold usually needs to be heated to achieve suitable plasticity and flowability of the material. Aluminum has a high thermal conductivity, which can quickly conduct heat from the heating source to various parts of the mold.

[0077] The stationary mold part has a first heating hole 221, and the moving mold part 24 has a second heating hole 241. The fixture 200 also includes multiple heating elements disposed in the first heating hole 221 and / or the second heating hole 241. These heating elements can be heating wires or heating rods. The heating elements can control the heating temperature, thereby enabling the mold to be quickly heated to a set temperature according to the requirements of the processing technology and maintaining temperature stability. By rationally arranging the position and number of heating wires in the heating holes, precise heating of different parts of the mold can be achieved, meeting the heating requirements of different areas of the diffuser plate 12.

[0078] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0079] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0080] The backlight module and display device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A backlight module, characterized in that, include: Diaphragm assembly; A diffuser plate is disposed on one side of the diaphragm assembly along the thickness direction of the diaphragm assembly. The diffuser plate includes a body portion and a bent portion. The body portion is stacked with the diaphragm assembly. The bent portion is connected to the edge of the body portion and is bent relative to the body portion in a direction away from the diaphragm assembly.

2. The backlight module of claim 1, wherein, It also includes a support frame that surrounds the diaphragm assembly and the diffuser plate; the support frame is recessed in a region toward the diaphragm assembly to form a first clearance space, and the edge of the diaphragm assembly extends into the first clearance space; the support frame is recessed in a region toward the bend of the diffuser plate to form a second clearance space, and at least a portion of the structure of the bend extends into the second clearance space.

3. The backlight module of claim 2, wherein, The support frame includes a first support portion and a second support portion, the first support portion being connected to the second support portion, the first support portion having a first clearance space, and the second support portion having a second clearance space; the first support portion also has a reflective slope, the reflective slope extending between the diaphragm assembly and the diffuser plate, the reflective slope facing the diaphragm assembly.

4. The backlight module of claim 3, wherein, The second support has a limiting slope, which is connected to the end of the reflecting slope, and the limiting slope faces the bent portion of the diffuser plate.

5. The backlight module of claim 3, wherein, The angle between the reflective slope and the plane perpendicular to the thickness direction of the backlight module is 38° to 70°.

6. The backlight module of claim 3, wherein, The support frame includes a third support portion, which is connected to the side of the second support portion away from the first support portion; the backlight module also includes a back plate, which is connected to the third support portion.

7. The backlight module of claim 6, wherein, The third support portion has a limiting groove on the side away from the second support portion, and the edge of the back plate is bent upward to form a hook portion, which engages with the limiting groove.

8. The backlight module according to any one of claims 1 to 7, wherein, The bent portion bends away from the diaphragm assembly.

9. The backlight module of claim 8, wherein, The main body and the bent portion are smoothly connected.

10. The backlight module according to any one of claims 2 to 7, wherein, The diffuser plate also includes an extension portion connected to the side of the bent portion away from the main body portion, and the extension portion extends toward the second clearance space.

11. A display device, characterized by comprising: include: A backlight module, wherein the backlight module is the backlight module according to any one of claims 1 to 10; The display panel is disposed on the light-emitting side of the backlight module.

12. The display device according to claim 11, wherein It also includes a mid-frame, which is disposed around the backlight module and the display panel, and is connected to the backlight module and the display panel respectively.

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