Backlight module and display device

Abstract

The application provides a backlight module and a display device. The backlight module comprises a back plate, the back plate comprising a main body part and an extension part, the main body part having a light mixing cavity, the extension part being arranged at least on one side of the main body part, the extension part being connected with the main body part, the extension part having a receiving groove, the receiving groove being communicated with the light mixing cavity; a diffusion plate, the side of the diffusion plate being overlapped in the receiving groove and being arranged on the light mixing cavity; and a light leakage prevention piece, one end of the light leakage prevention piece being connected with the diffusion plate and the other end of the light leakage prevention piece extending towards the inside of the receiving groove. The backlight module can effectively solve the light leakage problem caused by the expansion and contraction of the diffusion plate.

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 the field of display device design, with continuous technological advancements and rising consumer aesthetic demands, pursuing higher screen-to-body ratios and narrower bezels has become a mainstream trend in the industry. However, this design trend poses unprecedented challenges to the stability of internal components of display devices, especially the fixation of diffuser plates.

[0003] The diffuser plate is one of the core components of the backlight module in a display device, and its material properties determine that it has a large coefficient of thermal expansion and contraction. In existing display device technologies, the diffuser plate is usually placed on the back plate, and its main function is to homogenize the light emitted from the light source to ensure that the display device can present a high-quality display effect. However, as bezel designs continue to become narrower, the reserved space inside the display device that can support the diffuser plate and provide buffer for its expansion and contraction has been drastically reduced. When the diffuser plate expands or contracts due to factors such as temperature changes, the limited reserved space can easily lead to light leakage at the edges of the display device if the expansion and contraction is too large, resulting in light leakage.

[0004] Therefore, while ensuring that the display device can meet the design requirements of high screen ratio and narrow bezel, how to effectively solve the light leakage problem caused by the expansion and contraction of the diffuser plate has become a key technical problem that urgently needs to be solved in the current display device design field. Utility Model Content

[0005] This application provides a backlight module and a display device, which can effectively solve the light leakage problem caused by the expansion and contraction of the diffuser plate.

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

[0007] A backplate, the backplate comprising a main body and an extension, the main body having a light mixing cavity, the extension being disposed at least on one side of the main body, the extension being connected to the main body, the extension having a receiving groove, the receiving groove communicating with the light mixing cavity;

[0008] A diffuser plate, the sides of which overlap the receiving groove and are disposed on the mixing cavity;

[0009] A light-proof component, one end of which is connected to the diffuser plate, and the other end of which extends toward the interior of the receiving groove.

[0010] In some embodiments, the light leakage prevention element is fixed to the side of the diffuser plate away from the light mixing cavity and protrudes from the side edge of the diffuser plate facing the receiving groove.

[0011] In some embodiments, the backlight module further includes a blue light source, which is fixed inside the main body and configured to emit blue light; the light leakage prevention component includes a first transparent segment and a quantum dot segment, the first transparent segment is connected to the quantum dot segment, the first transparent segment is attached to the diffuser plate, and the quantum dot segment protrudes from one side edge of the diffuser plate facing the receiving groove.

[0012] In some embodiments, the light-proof component includes a second transparent section and a light-absorbing section, the second transparent section being connected to the light-absorbing section and being attached to the diffuser plate, the light-absorbing section protruding from one side edge of the diffuser plate facing the receiving groove.

[0013] In some embodiments, along the extending direction of the diffuser plate, the receiving groove includes a first groove segment and a second groove segment, the second groove segment being disposed on the side of the first groove segment away from the diffuser plate; in the thickness direction of the backlight module, the size of the first groove segment is smaller than the size of the second groove segment, and the second groove segment protrudes from the side of the first groove segment near the main body portion of the back plate.

[0014] In some embodiments, the dimension of the second groove protruding from the side of the first groove near the main body of the back plate is a third dimension, and the third dimension is greater than or equal to the length of the light-blocking element disposed in the second groove.

[0015] In some embodiments, one side of the light-proof component is connected to the diffuser plate, and the opposite side of the light-proof component is connected to the inner wall of the receiving groove; in a direction parallel to the plane of the diffuser plate, the distance between the end face of the diffuser plate facing the receiving groove and the inner wall of the receiving groove is a first length, and the distance the light-proof component extends from the connection point of the diffuser plate towards the inner wall of the receiving groove is a second length, wherein the first length is less than the second length.

[0016] In some embodiments, the light-blocking element is a folded surface or curved surface extending in a direction parallel to the plane of the diffuser plate.

[0017] In some embodiments, the backlight module further includes a carrier member disposed within the light mixing cavity, the carrier member being connected to the main body, the carrier member being a transparent structure, and the carrier member and the extension portion jointly supporting the diffuser plate.

[0018] In some embodiments, the backlight module further includes a fixing frame, which is fixed to the back plate along the thickness direction of the backlight module; the fixing frame further includes a frame body and a limiting part, the frame body is fixed to the back plate, the limiting part is disposed at the opening of the receiving groove, the limiting part protrudes from the frame body, and the limiting part extends toward the diffuser plate.

[0019] In some embodiments, the backlight module further includes transparent double-sided adhesive tape disposed between the light-blocking component and the diffuser plate to fix the light-blocking component on the diffuser plate.

[0020] This application embodiment also provides a display device, including:

[0021] Backlight module, wherein the backlight module is the aforementioned backlight module;

[0022] A liquid crystal module, wherein the liquid crystal module is disposed on the light-emitting side of the backlight module.

[0023] The backlight module and display device provided in this application include a backplate, a diffuser plate, and a light leakage prevention component. During the use of the backlight module, due to the expansion and contraction characteristics of the diffuser plate, gaps can easily form between the diffuser plate and the receiving groove of the backplate when it expands or contracts, leading to light leakage from these gaps. The light leakage prevention component in this application is connected to the diffuser plate at one end and extends into the receiving groove at the other end, effectively blocking or handling light leakage from the gaps. This effectively solves the light leakage problem caused by the expansion and contraction of the diffuser plate, thereby improving the display quality and user experience of the display device. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the first structure of the backlight module provided in the embodiments of this application.

[0026] Figure 2 This is a schematic diagram of a second structure of the backlight module provided in an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of a third structure of the backlight module provided in the embodiments of this application.

[0028] Figure 4This is a schematic diagram of a fourth structure of the backlight module provided in the embodiments of this application.

[0029] Figure 5 This is a schematic diagram of the fifth structure of the backlight module provided in the embodiments of this application.

[0030] Figure 6 for Figure 5 A magnified schematic diagram of part A.

[0031] Figure 7 This is a schematic diagram of the sixth structure of the backlight module provided in the embodiments of this application.

[0032] Figure 8 for Figure 7 A magnified schematic diagram of part B.

[0033] Figure 9 for Figure 3 A magnified schematic diagram of part C.

[0034] Figure 10 This is a schematic diagram of the seventh structure of the backlight module provided in the embodiments of this application.

[0035] Figure 11 for Figure 10 A magnified schematic diagram of part D.

[0036] Figure 12 This is a schematic diagram of the eighth structure of the backlight module provided in the embodiments of this application.

[0037] Figure 13 for Figure 12 A magnified schematic diagram of part E. Detailed Implementation

[0038] 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.

[0039] This application provides a backlight module and a display device, which can effectively solve the light leakage problem caused by the expansion and contraction of the diffuser plate. The following is a detailed description with reference to the accompanying drawings.

[0040] 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.

[0041] This application provides a backlight module 100, which provides sufficient brightness and uniformly distributed light to enable the liquid crystal module to display images normally. The backlight module 100 has a display area and a non-display area surrounding the display area. The display area is used to actually display the image, while the non-display area is mainly used for setting up auxiliary structures and circuits. The backlight module 100 can include a direct-lit backlight module and an edge-lit backlight module. The backlight module 100 in this application embodiment is described as a direct-lit backlight module.

[0042] The backlight module 100 includes a back plate 11, a diffuser plate 12, and a light leakage prevention component 13.

[0043] The backplate 11 includes a main body 111 and an extension 112. The main body 111 has a light mixing cavity 1111. The main body 111 includes a bottom wall 1112 and a side wall 1113, which is connected to the bottom wall 1112 to jointly enclose the light mixing cavity 1111. The backlight module 100 also includes a light source 20, which can be an LED (light-emitting diode), miniLED (mini light-emitting diode), etc. LEDs have advantages such as high luminous efficiency, long lifespan, energy saving and environmental protection, and are currently the most commonly used light source type in backlight modules 100. As an upgraded version of LEDs, miniLEDs have higher brightness and better contrast performance, which can further improve the display effect. The light source 20 is disposed on the bottom wall 1112, and the light emitted from the light source 20 is mixed in the light mixing cavity 1111. During the light mixing process, the light undergoes multiple reflections, refractions and scatterings, making the light distribution more uniform, thus providing a good foundation for subsequent display.

[0044] The extension 112 is connected to the main body 111, and its location and structure play a crucial role in the installation and fixation of the diffuser plate 12. The extension 112 can be located at the light outlet of the mixing cavity 1111. The extension 112 has a receiving groove 1121, the depth of which can be parallel to the plane of the back plate 11. The receiving groove 1121 communicates with the mixing cavity 1111.

[0045] The extension 112 and the main body 111 can be integrally formed, or they can be set separately and fixed later. In practical applications, it is necessary to comprehensively consider factors such as the specific requirements of the backlight module 100, the production process, the cost budget, and maintenance requirements, and select the most suitable setting method to achieve an optimal balance between the performance and cost of the backlight module 100.

[0046] From a structural stability perspective, unibody molding eliminates gaps and potential loosening risks between the two components. During the production, transportation, and use of the backlight module 100, the unibody structure can better withstand external vibrations and impacts. In terms of optical performance, unibody molding helps reduce light scattering and reflection losses at the connection points.

[0047] In terms of manufacturing process, the separate configuration allows for optimization of the manufacturing processes of the extension 112 and the main body 111 according to different requirements. For example, the main body 111 can be manufactured using a process suitable for efficient light mixing to ensure that the light emitted by the light source 20 can be fully mixed in the light mixing cavity 1111; while the extension 112 can be manufactured using specific structures and materials according to the installation and fixing requirements of the diffuser plate 12.

[0048] The diffuser plate 12 overlaps the receiving groove 1121 on its side and can cover the light mixing cavity 1111. The main function of the diffuser plate 12 is to further diffuse the uniformly mixed light in the light mixing cavity 1111, so that the light is more evenly irradiated onto the liquid crystal module, thereby ensuring the uniformity and consistency of the displayed image.

[0049] Please see Figure 2 , Figure 2 This is a schematic diagram of a second structure of the backlight module provided in this application embodiment. However, due to the large coefficient of expansion and contraction of the diffuser plate 12, some problems may occur during actual use. At low temperatures, the diffuser plate 12 will shrink, causing its size to decrease, which may cause it to fall out of the receiving groove 1121. In addition, when the backlight module 100 is used vertically, the diffuser plate 12 may tilt due to gravity. When the diffuser plate 12 cannot be tightly attached to the inner wall of the receiving groove 1121, the light in the mixing cavity 1111 will be transmitted through the gap between the diffuser plate 12 and the receiving groove 1121. This transmitted light may cause light leakage at the edges of the display device equipped with the backlight module 100. Light leakage not only affects the display effect of the display device, causing bright or dark edges on the screen and reducing the overall quality of the screen, but also affects the user's visual experience, causing discomfort to the user.

[0050] To address the aforementioned issues without significant structural changes, this application provides a light-blocking component 13. This component 13 is disposed within a receiving groove 1121, with one end connected to a diffuser plate 12 and the other end extending into the receiving groove 1121. The light-blocking component 13 is configured to block light transmitted through the gap between the diffuser plate 12 and the receiving groove 1121.

[0051] Specifically, the light leakage prevention component 13 proposed in this application can be made of a material with light-uniforming or light-absorbing properties. When light is transmitted through the gap between the diffuser plate 12 and the receiving groove 1121, the light leakage prevention component 13 can effectively act on the light by means of light-uniforming treatment or absorption, thereby effectively preventing light that has not been fully acted on by the diffuser plate 12 from being emitted to the outside of the backlight module 100.

[0052] For example, when a light-diffusing element is used as the light-prevention element 13, because the light-diffusing element has the characteristic of uniformly distributing light, when light shines on the light-diffusing element, the light will undergo multiple scattering and refractions inside the light-diffusing element, thereby being re-homogenized. The light after the light-diffusing treatment can continue to participate in the light mixing and propagation process within the backlight module 100, which not only avoids light leakage but also helps to improve the overall light uniformity of the backlight module 100.

[0053] For example, when a black material with good light absorption properties is used as the light leakage prevention component 13, this black material has a high light absorption rate. When light shines on the light leakage prevention component 13, most of the light is absorbed by the black material, and only a very small portion of the light may be reflected or scattered. However, the intensity of these reflected or scattered light is extremely weak and insufficient to affect the display effect of the display device. In this way, light leakage can be effectively avoided, thereby solving the light leakage problem caused by the expansion and contraction of the diffuser plate 12.

[0054] Please continue reading. Figure 1 The backlight module 100 also includes transparent double-sided adhesive tape 14, which is disposed between the light-leakage prevention component 13 and the diffuser plate 12 to fix the light-leakage prevention component 13 to the diffuser plate 12. The transparency of the transparent double-sided adhesive tape 14 gives it good optical compatibility. In the backlight module 100, light needs to pass through various components for propagation and mixing. The transparent double-sided adhesive tape will not significantly interfere with the light, ensuring normal light transmission and light emission effect.

[0055] To better prevent light leakage, the light leakage prevention component 13 is designed to cover an area larger than the area affected by the expansion and contraction of the diffuser plate 12. In practical applications, the expansion and contraction of the diffuser plate 12 may be unpredictable, and the location and area of ​​light leakage may vary. Therefore, designing the effective area of ​​the light leakage prevention component 13 to be larger than the potential light leakage area ensures that the component 13 can effectively function regardless of the location of the light leakage, thereby further improving the reliability and stability of light leakage prevention.

[0056] Please continue reading. Figure 1 as well as Figure 3 , Figure 3This is a schematic diagram of a third structure of the backlight module provided in this application embodiment. The backlight module 100 also includes a diaphragm assembly 17, which is disposed on the light-emitting side of the diffuser plate 12. For example, the diaphragm assembly 17 can be a brightness enhancement film. In some cases, when the light leakage prevention member 13 is fixed to the side of the diffuser plate 12 away from the light mixing cavity 1111, the diaphragm assembly 17 can overlap the light-emitting side of the diffuser plate 12, and one end of the diaphragm assembly 17 extends into the receiving groove 1121. In other cases, when the light leakage prevention member 13 is connected to the side of the diffuser plate 12 facing the first receiving cavity, the diaphragm assembly 17 is directly overlapped on the diffuser plate 12.

[0057] In some embodiments, please continue reading Figure 3 The backlight module 100 also includes a support member 15, which is disposed within the light mixing cavity 1111. The support member 15 is connected to the main body 111, for example, it can be snapped and fixed to the side wall 1113 of the main body 111. The support member 15 is transparent, and together with the extension 112, it supports the diffuser plate 12. Since the display device may be affected by various external factors, such as temperature changes and mechanical vibrations, the diffuser plate 12 is prone to deformation or displacement. The joint support of the support member 15 and the extension 112 can effectively reduce the deformation and displacement of the diffuser plate 12, thereby ensuring the working condition of the diffuser plate 12.

[0058] Because the support frame is transparent, the light emitted by the light source 20 can pass through the support, increasing the light flux of the visible area at the edge of the display module. This solves the technical problem of shadows appearing in the visible area at the edge of the existing display module and provides the possibility of further narrowing the bezel of the display device.

[0059] In other embodiments, please refer to Figure 4 , Figure 4 This is a schematic diagram of a fourth structure of the backlight module provided in this application embodiment. The backlight module 100 also includes a fixing frame 16, which is fixed to the back plate 11 along the thickness direction of the backlight module 100. The fixing frame 16 also includes a frame body 161 and a limiting part 162. The frame body 161 is fixed to the back plate 11, and the limiting part 162 is disposed at the opening of the receiving groove 1121. The limiting part 162 is disposed at the opening of the receiving groove 1121, protrudes from the frame body 161, and extends toward the diffuser plate 12. The limiting part 162 is configured to increase the depth of the receiving groove 1121. The side of the diaphragm assembly 17 can also overlap the frame body 161 of the fixing frame 16.

[0060] During the use of the backlight module 100, the diffuser plate 12 may expand or contract due to thermal expansion and contraction. Increasing the groove depth provides more room for the anti-leakage component 13, ensuring that the anti-leakage component 13 can always effectively cover the gap between the diffuser plate 12 and the receiving groove 1121, preventing light leakage. For example, in a high-temperature environment, the diffuser plate 12 expands, and the increased groove depth of the limiting part 162 provides sufficient space for the anti-leakage component 13 to make corresponding adjustments, avoiding failure of the anti-leakage function due to the expansion of the diffuser plate 12.

[0061] Meanwhile, in addition to increasing the groove depth to accommodate the expansion and contraction of the diffuser plate 12, the limiting part 162 extends from the non-display area 102 of the backlight module 100 into the display area 101, further limiting the diffuser plate 12. This restricts the displacement of the diffuser plate 12 in the direction perpendicular to the thickness of the backlight module 100, ensuring that the diffuser plate 12 is always in the correct position, and further improving the structural stability and optical performance of the backlight module 100.

[0062] In this embodiment, the presence of the mounting bracket 16 also facilitates the installation of the diaphragm assembly 17. The diaphragm assembly 17 can be attached to the frame body 161 of the mounting bracket 16, a design that cleverly separates the diffuser plate 12 from other diaphragm assemblies 17.

[0063] Because the diffuser plate 12 is subject to thermal expansion, without the support and separation provided by the fixing frame 16, the thermal expansion of the diffuser plate 12 may cause it to be squeezed or rubbed against other diaphragm assemblies 17, thereby affecting the flatness and stability of the diaphragm assemblies 17 and consequently affecting the display effect of the backlight module 100. By attaching the diaphragm assembly 17 to the frame body 161 of the fixing frame 16, the problem of reduced stability caused by the thermal expansion of the diffuser plate 12 is avoided.

[0064] In the backlight module 100, the light leakage prevention element 13 is crucial for improving the display effect. Several different types and connection methods of the light leakage prevention element 13 will be described in detail below. Although these embodiments are examples, similar structures are all within the scope of protection of this application.

[0065] Please see Figure 5 as well as Figure 6 , Figure 5 This is a schematic diagram of the fifth structure of the backlight module provided in the embodiments of this application. Figure 6 for Figure 5A magnified schematic diagram of part A. In the first embodiment of the light leakage prevention component 13, the light leakage prevention component 13 is fixed to the side of the diffuser plate 12 away from the light mixing cavity 1111. The light leakage prevention component 13 extends toward the interior of the receiving groove 1121 and protrudes from the edge of the diffuser plate 12 toward the receiving groove 1121. On the one hand, this ensures that the light leakage prevention component 13 and the diffuser plate 12 fit tightly together to form a stable connection; on the other hand, it can effectively intercept light that may be transmitted from the gap between the diffuser plate 12 and the receiving groove 1121, thereby preventing light leakage and ensuring the display effect of the display device.

[0066] In some cases, the light leakage prevention component 13 may include a first transparent section 131 and a light-diffusing section 132, with the light-diffusing section 132 connected to the first transparent section 131. The first transparent section 131 is connected to the diffuser plate 12 to stably fix the light leakage prevention component 13 onto the diffuser plate 12. The light-diffusing section 132 protrudes from one edge of the diffuser plate 12 facing the receiving groove 1121. When light is transmitted through the gap and illuminates the light-diffusing section 132, the light-diffusing section 132 can exert its light-diffusing characteristics. The light processed by the light-diffusing section 132 can continue to participate in the light mixing and propagation process within the backlight module 100, not only preventing light leakage but also helping to improve the overall light uniformity of the backlight module 100, thereby improving the display quality of the display device.

[0067] To further ensure the stability of light output, the material of the homogenizing section 132 can be the same as that of the diffuser plate 12. The homogenizing section 132 and the diffuser plate 12 made of the same material have better compatibility in optical properties, which can ensure smoother light propagation between the two and reduce light loss and optical performance fluctuations caused by material differences.

[0068] For example, the backlight module 100 also includes a blue light source, namely, the light source 20 emits blue light. The blue light source is fixed inside the main body 111 and is configured to emit blue light. Quantum dots are dispersed in the diffuser plate 12 to convert some of the blue light into red and green light. The red, green, and remaining blue light mix together to form white light, providing a uniform white light source 20 for the liquid crystal module. The light leakage prevention component 13 includes a first transparent section 131 and a quantum dot section. The first transparent section 131 is connected to the quantum dot section. The quantum dot section is made of the same material as the diffuser plate 12 and has the same diffusion effect and light conversion capability. The quantum dot section and the diffuser plate 12 are highly compatible in optical properties and can work together to ensure stable and reliable light propagation and conversion between them. The first transparent section 131 is attached to the diffuser plate 12, and the quantum dot section protrudes from the edge of the diffuser plate 12 facing the receiving groove 1121.

[0069] In other cases, please refer to Figure 7 as well as Figure 8 , Figure 7This is a schematic diagram of the sixth structure of the backlight module provided in the embodiments of this application. Figure 8 for Figure 7 A magnified schematic diagram of part B. The light leakage prevention may further include a second transparent section 133 and a light-absorbing section 134. The light-absorbing section 134 is made of black material and is connected to the second transparent section 133. In this case, the second transparent section 133 is attached to the diffuser plate 12, and the light-absorbing section 134 protrudes from the edge of the diffuser plate 12 facing the receiving groove 1121. When light shines on the light-absorbing section 134, due to the extremely high absorption rate of the light-absorbing section 134, most of the light is quickly absorbed, effectively preventing light leakage and thus solving the light leakage problem caused by the expansion and contraction of the diffuser plate 12, improving the display quality and user experience of the display device.

[0070] In a second embodiment of the light-leakage prevention component 13, please refer to Figure 3 as well as Figure 9 , Figure 9 for Figure 3 A magnified schematic diagram of part C. Along the extending direction of the diffuser plate 12, the receiving groove 1121 includes a first groove segment 1121a and a second groove segment 1121b, the second groove segment 1121b being disposed on the side of the first groove segment 1121a away from the diffuser plate. In the thickness direction of the backlight module 100, the dimension W1 of the first groove segment 1121a is smaller than the dimension W2 of the second groove segment 1121b, and the second groove segment 1121b protrudes from the side of the first groove segment 1121a near the main body 111 of the back plate 11.

[0071] In some cases, to make it easier for the light-blocking component 13 to extend into the second groove section 1121b, the light-blocking component 13 is connected to the side of the diffuser plate 12 facing the first groove section 1121a for easy installation.

[0072] When the diffuser plate 12 contracts, a gap may form between the diffuser plate 12 and the receiving groove 1121, causing light leakage. The light-proof component 13 can be at least partially stretched from the second groove section 1121b into the first groove section 1121a by the diffuser plate 12, thereby effectively covering the gap.

[0073] When the diffuser plate 12 expands, without the design of the second groove section 1121b, the light leakage prevention component 13 might directly abut against the wall of the receiving groove 1121, causing the light leakage prevention component 13 to be squeezed and deformed. This would not only affect its light leakage prevention performance but also potentially damage other structures of the backlight module 100. The second groove section 1121b provides a receiving space for the light leakage prevention component 13, allowing it to retract into the second groove section 1121b when the diffuser plate 12 expands, thus avoiding contact with the inner wall of the receiving groove 1121.

[0074] The second groove segment 1121b protrudes beyond the first groove segment 1121a near the main body 111 of the back plate 11 by a third dimension W3, which is greater than or equal to the length of the light-blocking component 13 disposed within the second groove segment 1121b. It is understood that the light-blocking component 13 within the second groove segment 1121b can be inclined. From an applicability perspective, the second groove segment 1121b provides more space for the light-blocking component 13, allowing it to move and deform freely under different conditions. For example, the expansion and contraction of the diffuser plate 12 may vary under different operating temperatures; the larger protrusion W3 of the second groove segment 1121b can adapt to this change, ensuring that the light-blocking component 13 can always effectively prevent light leakage. From a mechanical performance perspective, sufficient space reduces the stress on the light-blocking component 13 during movement, lowering the risk of damage.

[0075] In the third embodiment of the light-blocking component 13, please refer to Figure 10 as well as Figure 11 , Figure 10 This is a schematic diagram of the seventh structure of the backlight module provided in the embodiments of this application. Figure 11 for Figure 10 A magnified schematic diagram of part D. One side of the light-blocking component 13 is connected to the diffuser plate 12, and the opposite side of the light-blocking component 13 is connected to the inner wall of the receiving groove 1121. In some cases, for ease of connection, the light-blocking component 13 is connected to the side of the diffuser plate 12 facing the receiving groove 1121. In a direction parallel to the plane of the diffuser plate 12, the distance between the end face of the diffuser plate 12 facing the receiving groove 1121 and the inner wall of the receiving groove 1121 is the first length; the distance the light-blocking component 13 extends from the connection point of the diffuser plate 12 towards the inner wall of the receiving groove 1121 is the second length; the first length is less than the second length. After connection, the light-blocking component 13 can fully cover the gap between the diffuser plate 12 and the receiving groove 1121, and even with certain assembly errors or changes in component dimensions, it can ensure that the light-blocking component 13 is always in an effective light-blocking position.

[0076] Please refer to Figure 12 as well as Figure 13 , Figure 12 This is a schematic diagram of the eighth structure of the backlight module provided in the embodiments of this application. Figure 13 for Figure 12A magnified schematic diagram of part E. The light-blocking component 13 is telescopically adjustable. The telescopic light-blocking component 13 can automatically adjust its length according to this displacement, always maintaining effective coverage of the gap. For example, in a high-temperature environment, the diffuser plate 12 may move towards the receiving groove 1121 due to thermal expansion; in this case, the light-blocking component 13 will be stretched to adapt to this change. In a low-temperature environment, the diffuser plate 12 contracts, and the light-blocking component 13 will shorten accordingly, ensuring that it will not be damaged due to excessive stretching. This adaptive telescopic capability greatly improves the reliability and service life of the light-blocking component 13.

[0077] For further information, please refer to [link / reference]. Figure 13 The light leakage prevention component 13 is folded, and is a folded or curved surface extending in a direction parallel to the plane of the diffuser plate 12. This folded structure allows for a greater extension length within a limited space. Given the limited internal space of the backlight module 100, this design enables the light leakage prevention component 13 to effectively cover a larger gap area without increasing its volume excessively. Furthermore, the folded structure has a certain degree of elasticity, allowing it to deform under external force and then automatically return to its original shape, further enhancing the adaptability and stability of the light leakage prevention component 13.

[0078] This application also provides a display device, 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 can be recognized by the human eye. This display device can be a television, computer monitor, mobile phone screen, vehicle display screen, etc.

[0079] The display device includes a backlight module 100 and a liquid crystal module. The backlight module 100 is the same as the one described in the above embodiment, and the liquid crystal module is disposed on the light-emitting side of the backlight module 100. Because the backlight module 100 provides uniform, stable, wide-range, and high-brightness light, the liquid crystal module can more accurately modulate the light, fully utilizing its display performance and providing users with a more realistic visual experience.

[0080] 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.

[0081] 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.

[0082] 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: A backplate, the backplate comprising a main body and an extension, the main body having a light mixing cavity, the extension being disposed at least on one side of the main body, the extension being connected to the main body, the extension having a receiving groove, the receiving groove communicating with the light mixing cavity; A diffuser plate, the sides of which overlap the receiving groove and are disposed on the mixing cavity; A light-proof component, one end of which is connected to the diffuser plate, and the other end of which extends toward the interior of the receiving groove.

2. The backlight module of claim 1, wherein, The light leakage prevention component is fixed to the side of the diffuser plate away from the light mixing cavity, and protrudes from the edge of the diffuser plate facing the receiving groove.

3. The backlight module of claim 2, wherein, The backlight module also includes a blue light source, which is fixed inside the main body and configured to emit blue light; the light leakage prevention component includes a first transparent segment and a quantum dot segment, the first transparent segment is connected to the quantum dot segment, the first transparent segment is attached to the diffuser plate, and the quantum dot segment protrudes from the diffuser plate on one side edge facing the receiving groove.

4. The backlight module of claim 2, wherein, The light-proof component includes a second transparent section and a light-absorbing section. The second transparent section is connected to the light-absorbing section and is attached to the diffuser plate. The light-absorbing section protrudes from the diffuser plate on one side edge facing the receiving groove.

5. The backlight module of claim 1, wherein, Along the extension direction of the diffuser plate, the receiving groove includes a first groove segment and a second groove segment, the second groove segment being disposed on the side of the first groove segment away from the diffuser plate; in the thickness direction of the backlight module, the size of the first groove segment is smaller than the size of the second groove segment, and the second groove segment protrudes from the side of the first groove segment near the main body of the back plate.

6. The backlight module of claim 5, wherein, The second groove protrudes from the side of the first groove near the main body of the back plate by a third dimension, and the third dimension is greater than or equal to the length of the light-blocking component disposed in the second groove.

7. The backlight module according to claim 1, characterized in that, One side of the light-proof component is connected to the diffuser plate, and the opposite side of the light-proof component is connected to the inner wall of the receiving groove. In a direction parallel to the plane of the diffuser plate, the distance between the end face of the diffuser plate facing the receiving groove and the inner wall of the receiving groove is a first length, and the distance the light-proof component extends from the connection point of the diffuser plate towards the inner wall of the receiving groove is a second length. The first length is less than the second length.

8. The backlight module of claim 7, wherein, The light-proof component is a folded or curved surface that extends in a direction parallel to the plane of the diffuser plate.

9. The backlight module according to any one of claims 1 to 8, wherein, It also includes a carrier, which is disposed in the light mixing cavity and connected to the main body. The carrier is a transparent structure, and the carrier and the extension together support the diffuser plate.

10. The backlight module according to any one of claims 1 to 8, characterized in that, The backlight module also includes a fixing frame, which is fixed to the back plate along the thickness direction of the backlight module; the fixing frame also includes a frame body and a limiting part, the frame body is fixed to the back plate, the limiting part is disposed at the opening of the receiving groove, the limiting part protrudes from the frame body, and the limiting part extends toward the diffuser plate.

11. The backlight module according to any one of claims 1 to 8, wherein, It also includes transparent double-sided adhesive tape, which is disposed between the light-blocking component and the diffuser plate to fix the light-blocking component on the diffuser plate.

12. 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 11; A liquid crystal module, wherein the liquid crystal module is disposed on the light-emitting side of the backlight module.

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