Backlight module capable of realizing regional dimming

Abstract

The utility model relates to the technical field of display devices, and discloses a regional dimming backlight module which comprises a shell, an optical film piece and a light source assembly, and the optical film piece and the light source assembly are sequentially installed in the shell from top to bottom. The light source assembly comprises a diffusion plate, a light splitting film, a lampshade and a lamp panel which are sequentially stacked from top to bottom. A plurality of lamp cups are formed on the lampshade, a plurality of lamp areas are arranged on the lamp panel, and each lamp cup corresponds to one lamp area. The backlight module has the following technical effects: 1, the light splitting film is arranged between the lampshade and the diffusion plate, so that the OD (optical density) value is effectively reduced, the resolution ratio is high, the optical grade is excellent, and meanwhile, the thickness of the backlight module is reduced, so that the display device is lighter and thinner; and 2, the plurality of lamp areas on the lamp panel can realize partitioned display and regional control, so that the energy consumption is effectively reduced, and meanwhile, the display contrast ratio is favorably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of display devices, and in particular relates to a backlight module capable of regional dimming. Background Art

[0002] Liquid crystal displays have become the mainstream of the display device market due to their advantages such as thin and light volume and small footprint. The backlight module is one of the key components of the LCD panel. Its function is to provide sufficient brightness and evenly distributed light source so that it can display images normally. With the development of technology, users have higher and higher requirements for displays, and have begun to pursue thin, light, high-resolution, and high-contrast display devices, which has also put forward higher requirements for the backlight module.

[0003] In the prior art, the brightness of each lamp bead on the LED lamp board is independently adjusted and controlled to achieve brightness adjustment of different partitions, thereby improving the brightness uniformity and contrast of the display device and enhancing the image quality. Although this improves the contrast of the display to a certain extent, it still fails to meet the requirements of thin and light display devices, high resolution and high contrast. Utility Model Content

[0004] In order to solve the shortcomings of the prior art, the utility model provides a backlight module with regional dimming, in which a splitter film is arranged between the lampshade and the diffuser plate, which effectively reduces the OD (Optical Distance) value and has a high resolution. At the same time, the thickness of the backlight module is reduced, making the display device thinner and lighter; a plurality of light zones are arranged on the lamp panel to realize partitioned display and regional control, effectively reducing energy consumption and at the same time, helping to improve the display contrast.

[0005] The technical effects to be achieved by the utility model are achieved through the following technical aspects:

[0006] The utility model provides a backlight module capable of regional dimming, comprising a shell, an optical film component and a light source component which are sequentially installed in the shell from top to bottom.

[0007] Furthermore, the light source assembly includes a diffusion plate, a bezel, a lampshade and a lamp panel stacked in sequence from top to bottom. The bezel is arranged between the diffusion plate and the lampshade, which can shorten the distance between the bezel and the lampshade, effectively reduce the OD (Optical Distance) value, and is conducive to improving display resolution and enhancing image quality, and to a certain extent reduces the thickness of the backlight module, which can realize the thinness of the display device.

[0008] Furthermore, the lampshade is formed with a plurality of lamp cups, and the lamp board is provided with a plurality of lamp zones, each of the lamp cups corresponding to one of the lamp zones. The lamp board is provided with a plurality of lamp zones to realize partition display and regional control, which can not only reduce energy consumption, but also realize the regulation of bright and dark areas, which is conducive to improving the display contrast.

[0009] As a further description of the technical solution of the utility model, the lamp area includes a plurality of lamp beads, and the lamp beads are encapsulated on the lamp board by means of semi-circular arc glue dispensing. Arranging a plurality of lamp beads in each lamp area can increase the adjustable range of brightness, thereby increasing the brightness difference between the bright area and the dark area, which is conducive to further improving the display contrast. Encapsulating the lamp beads by means of semi-circular arc glue dispensing can avoid the lamp beads from being completely exposed, which plays a better role in protecting the lamp beads, is conducive to extending the service life of the lamp beads, and ensuring the normal operation of the backlight module.

[0010] As a further description of the technical solution of the utility model, a plurality of support and limit columns are formed on the lampshade, and the support and limit columns are located at the intersection of the four adjacent lamp cups, and a limit fixing hole is formed on the beam splitter film at the position corresponding to the support and limit columns. The support and limit columns are used to support the diffusion plate, which can effectively prevent the diffusion plate from collapsing during use or in reliability experiments, affecting the display effect of the backlight module; at the same time, the beam splitter film is nested on the support and limit columns through the limit fixing holes, and the support and limit columns also play a role in fixing and limiting the beam splitter film.

[0011] As a further description of the technical solution of the utility model, a reinforcing rib is formed at the intersection of the edges of each of the four adjacent lamp cups. On the one hand, the reinforcing rib can enhance the strength between the adjacent lamp cups to prevent the lamp cups from being deformed during the injection molding process; on the other hand, the reinforcing rib can enhance the strength of the support limit column to prevent the support limit column from being deformed during the injection molding of the lampshade, and also avoid the risk of the support limit column breaking due to the vibration friction between the diffuser plate and the support limit column when the backlight module is undergoing the three comprehensive tests.

[0012] As a further description of the technical solution of the utility model, a plurality of anti-shrinkage holes are formed on the side of the lampshade, which can prevent the lampshade from shrinking and deforming during the injection molding process, thereby improving the qualified rate of the lampshade injection molding and avoiding cost waste.

[0013] As a further description of the technical solution of the utility model, the shell includes a die casting and an upper frame covering the die casting, a cover film is attached to the upper frame, and the optical film and the light source assembly are both installed in the die casting.

[0014] As a further description of the technical solution of the utility model, the upper frame is connected to the inner wall of the die casting through a first limiting assembly. The upper frame is connected to the die casting through a built-in limiting fixing method, which can reduce the frame width of the backlight module, reduce the volume of the backlight module, and avoid the phenomenon of the upper frame being pulled out.

[0015] As a further description of the technical solution of the utility model, the diffuser plate is connected to the die-casting through a second limiting component, the splitter film is connected to the die-casting through a third limiting component, the lampshade is connected to the die-casting through a fourth limiting component, and the lamp board is attached to the die-casting through thermal conductive adhesive.

[0016] As a further description of the technical solution of the utility model, the optical film part includes a brightness enhancement film, a luminance enhancement film, a quantum dot film and a light diffusion film stacked in sequence from top to bottom, and the brightness enhancement film, the luminance enhancement film, the quantum dot film and the light diffusion film are all connected to the die-casting part through a fifth limiting component.

[0017] As a further description of the technical solution of the utility model, it also includes an FPC photosensitive element, which is installed on the shell and electrically connected to the light board.

[0018] In summary, the utility model has at least the following benefits:

[0019] 1. The regional dimming backlight module provided by the utility model shortens the distance between the dichroic film and the lampshade by arranging the dichroic film between the lampshade and the diffusion plate, effectively reduces the OD (Optical Distance) value, and has high display resolution and excellent optical quality; at the same time, it reduces the thickness of the backlight module, making the display device thinner and lighter.

[0020] 2. The regional dimming backlight module provided by the utility model has a plurality of light zones arranged on the light panel, and each light zone can be independently adjusted and controlled, thereby realizing partitioned display and regional control, which can not only effectively reduce energy consumption, but also help to improve the contrast of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an exploded view of a backlight module capable of regional dimming according to Embodiment 1 of the utility model;

[0022] Figure 2 This is an exploded view of the light source assembly of Embodiment 1 of the present utility model;

[0023] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0024] Figure 4 for Figure 2A magnified schematic diagram of part B;

[0025] Figure 5 for Figure 2 A magnified schematic diagram of part C;

[0026] Figure 6 for Figure 2 The enlarged schematic diagram of the D part;

[0027] Figure 7 for Figure 2 The enlarged schematic diagram of part E in the middle;

[0028] Figure 8 This is an exploded view of the housing of Embodiment 3 of the present utility model;

[0029] Fig. 9 This is a schematic structural diagram of the first position limiting component of Embodiment 3 of the present utility model;

[0030] Fig.10 This is a schematic structural diagram of the second position limiting assembly of Embodiment 3 of the present utility model;

[0031] Fig.11 This is a schematic structural diagram of the third limiting component of Example 3 of the utility model;

[0032] Fig.12 This is a schematic structural diagram of the fourth position limiting assembly of Embodiment 3 of the present utility model;

[0033] Fig.13 This is a schematic diagram of the structure of the thermal conductive adhesive of Example 3 of the utility model;

[0034] Fig.14 This is a schematic structural diagram of an optical film component according to Embodiment 3 of the present utility model;

[0035] Fig.15 This is a schematic structural diagram of the FPC photosensitive element of Example 3 of the utility model.

[0036] Markings in the figure:

[0037] 1. Shell; 11. Die casting; 12. Upper frame; 12a. First side; 12b. Second side; 12c. Third side; 12d. Fourth side; 13. Cover film; 14. First limit assembly;

[0038] 2. Optical film; 21. Brightness enhancement film; 22. Brightness enhancement film; 23. Quantum dot film; 24. Diffraction film; 25. Fifth limiter assembly;

[0039] 3. Light source assembly; 31. Diffuser plate; 32. Beam splitter; 321. Positioning fixing hole; 33. Lamp cover; 331. Lamp cup; 332. Supporting position-limiting column; 333. Reinforcement rib; 334. Anti-shrinkage hole; 34. Lamp board; 341. Lamp area; 342. Lamp beads; 35. Second position-limiting assembly; 36. Third position-limiting assembly; 37. Fourth position-limiting assembly; 38. Thermal conductive adhesive;

[0040] 4. FPC photosensitive element. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0043] Example 1

[0044] refer to Figures 1 to 4 The regional dimming backlight module provided by the utility model comprises a housing 1, an optical film 2 and a light source assembly 3 which are sequentially installed in the housing 1 from top to bottom. Specifically, the light source assembly 3 comprises a diffusion plate 31, a splitter film 32, a lampshade 33 and a lamp board 34 which are sequentially stacked from top to bottom. The splitter film 32 is located between the diffusion plate 31 and the lampshade 33, so that the distance between the splitter film 32 and the lampshade 33 is shorter, which can effectively reduce the OD (Optical distance) value, and the OD value can be reduced to 2.2 mm, with high display resolution. At the same time, the thickness of the backlight module is reduced, and the display device can be made thinner and lighter.

[0045] Furthermore, a plurality of lamp cups 331 are formed on the lampshade 33, and a plurality of lamp areas 341 are provided on the lamp board 34, and each lamp cup 331 corresponds to a lamp area 341. The lamp board 34 is divided into a plurality of lamp areas 341, and the plurality of lamp areas 341 are distributed in an array, and each lamp area 341 is independently equipped with a control element, which can be independently controlled and adjusted, and can realize partition display and regional control, which can not only reduce energy consumption, but also can adjust the bright area and the dark area, which is conducive to improving the display contrast.

[0046] As a further optimization, the lamp area 341 includes a plurality of lamp beads 342, and the lamp beads 342 are mini LEDs. The use of miniLEDs has an energy-saving effect and is conducive to reducing energy consumption. In some embodiments, the lamp area 341 may include four lamp beads 342, and the four lamp beads 342 are distributed in an array. As one embodiment, 4928 lamp beads 342 can be set on the lamp board 34, wherein each lamp area 341 includes 4 lamp beads 342, and a total of 1232 lamp areas 341 are set on the lamp board 34. The pitch value of the backlight module is 7.85×7.75mm, and the OD value is 2.2mm, which can achieve a display without dark grids and excellent optical taste. Arranging multiple lamp beads 342 in each lamp area 341 can increase the adjustable range of brightness, thereby increasing the brightness difference between the bright area and the dark area, which is conducive to further improving the contrast of the display and enhancing the picture quality.

[0047] Furthermore, the lamp beads 342 are encapsulated on the lamp board 34 by semi-circular arc glue dispensing, which can prevent the lamp beads 342 from being completely exposed to the external environment, and provide better protection for the lamp beads 342, thereby helping to extend the service life of the lamp beads 342, improve the reliability performance of the lamp board 34, and ensure the normal and stable operation of the backlight module.

[0048] Example 2

[0049] As a further optimization of Example 1, refer to Figures 5 to 7 A plurality of support and limit posts 332 are formed on the lampshade 33. The support and limit posts 332 are located at the intersection of four adjacent lamp cups 331. A limit fixing hole 321 is formed on the dichroic film 32 at the position corresponding to the support and limit posts 332. It can be understood that the support and limit posts 332 are located at the top of the intersection of the edges of four adjacent lamp cups 331. The support and limit posts 332 are used to support the diffuser plate 31, which can effectively prevent the diffuser plate 31 from collapsing during use or in reliability experiments, affecting the display effect of the backlight module; at the same time, the dichroic film 32 can be nested on the support and limit posts 332 through the limit fixing holes 321. The support and limit posts 332 also play a role in limiting and fixing the dichroic film 32, which can prevent the dichroic film 32 from shifting and shaking.

[0050] The support and limit posts 332 and the lampshade 33 are integrally formed by injection molding, thereby eliminating the welding or assembly process of the support and limit posts 332, which not only simplifies the production process and reduces the production cost, but also enables the support and limit posts 332 to be more firmly connected to the lampshade 33, and the fixing effect is better. As one embodiment, the number of the support and limit posts 332 is six, which are arranged in two rows at equal intervals, and correspondingly, the number of the limit fixing holes 321 is also six.

[0051] Furthermore, reinforcing ribs 333 are formed at the intersection of the edges of every four adjacent lamp cups 331. It can be understood that the support limit column 332 is located at the top of the reinforcing rib 333 and is connected to the reinforcing rib 333. On the one hand, the reinforcing rib 333 can enhance the strength between adjacent lamp cups 331 to prevent the lamp cups 331 from being deformed during the injection molding process; on the other hand, the reinforcing rib 333 can enhance the strength of the support limit column 332 to prevent the support limit column 332 from being deformed during the injection molding process. At the same time, it also avoids the risk of the support limit column 332 breaking due to vibration or friction between the diffuser plate 31 and the support limit column 332 when the backlight module is undergoing the three comprehensive tests.

[0052] Furthermore, a plurality of water-shrinkage-proof holes 334 are formed on the side of the lampshade 33. It is understandable that the water-shrinkage-proof holes 334 are formed by the upper surface of the side of the lampshade 33 being recessed inward, and a plurality of water-shrinkage-proof holes 334 are formed on each side of the lampshade 33. The provision of the water-shrinkage-proof holes 334 can effectively prevent the lampshade 33 from shrinking and deforming during the injection molding process, which is beneficial to improving the qualified rate of the injection molding of the lampshade 33 and avoiding cost waste.

[0053] Example 3

[0054] As a further optimization of Example 1, refer to Figures 8 to 15 The housing 1 includes a die casting 11 and an upper frame 12 covering the die casting 11 , a cover film 13 is attached to the upper frame 12 , and the optical film 2 and the light source assembly 3 are both installed in the die casting 11 .

[0055] Furthermore, the upper frame 12 is connected to the inner wall of the die casting 11 through the first limiting component 14. As one embodiment, the upper frame 12 includes a first side 12a, a second side 12b, a third side 12c and a fourth side 12d, and the first limiting component 14 includes a plurality of buckles arranged on the first side 12a and a plurality of protrusions arranged at corresponding positions of the inner wall of the die casting 11 to match it. Specifically, the first side 12a is formed with a plurality of bending structures downward, and each bending structure is provided with a plurality of buckles. A mounting groove is formed inwardly at a position corresponding to the bending structure on the side wall of the die casting 11, and a protrusion matching the buckle is provided in the mounting groove. The bending structure is inserted into the mounting groove so that the buckle is engaged with the protrusion; the first limiting component 14 also includes buckles arranged on the second side 12b, the third side 12c and the fourth side 12d The first limiting component 14 also includes a plurality of hooks arranged on the second side 12b, the third side 12c and the fourth side 12d and a plurality of T-buckle grooves arranged on the corresponding positions of the inner wall of the die-casting 11 to match them, and fixing glue can be attached between the T-buckles and the T-buckle grooves, and the T-buckles are placed in the T-buckle grooves to achieve positioning and fixing; the first limiting component 14 also includes a plurality of bending buckles arranged on the third side 12c and a plurality of bending grooves arranged on the corresponding positions of the inner wall of the die-casting 11 to match them, and fixing glue can be attached between the bending buckles and the bending grooves, and the bending buckles are placed in the bending grooves to achieve positioning and fixing. The upper frame 12 is connected to the die-casting 11 by a built-in limiting fixing method, which can reduce the border width of the backlight module, reduce the volume of the backlight module, make the backlight module thinner and more compact, and effectively avoid the phenomenon of the upper frame being pulled out, thereby improving the firmness of the installation.

[0056] Furthermore, the diffuser plate 31 is connected to the die casting 11 through a second limiting assembly 35. As one embodiment, the second limiting assembly 35 includes a first limiting groove arranged on a long side of the diffuser plate 31 and a first limiting column arranged at a corresponding position on the side wall of the die casting 11 to match it, and the first limiting groove is clamped in the first limiting column to achieve limiting and fixing; the second limiting assembly 35 also includes a limiting lug arranged on the other long side of the diffuser plate 31 and a lug groove arranged at a corresponding position on the side wall of the die casting 11 to match it, and the limiting lug is inserted into the lug groove to achieve limiting and fixing.

[0057] The splitter film 32 is connected to the die-casting 11 through a third limiting component 36. As one embodiment, the third limiting component 36 includes a second limiting groove arranged on a long side edge of the splitter film 32 and a second limiting column arranged at a corresponding position on the side wall of the die-casting 11 to match it, and the second limiting groove is clamped on the second limiting column to achieve limiting and fixing.

[0058] The lampshade 33 is connected to the die casting 11 through the fourth limiting assembly 37. As one embodiment, the fourth limiting assembly 37 includes a plurality of limiting convex bumps arranged on the lampshade 33 and a plurality of card slots arranged at corresponding positions on the side wall of the die casting 11 to match the limiting convex bumps. The limiting convex bumps are engaged in the card slots to achieve limiting and fixing. The lamp board 34 is attached to the die casting 11 through the thermal conductive adhesive 38. The thermal conductive adhesive 38 can not only limit and fix the lamp board 34, but also dissipate heat for the lamp board 34. In some embodiments, a fixing adhesive can be attached between the lampshade 33 and the lamp board 34.

[0059] Further, the optical film 2 includes a brightness enhancement film 21, a brightness enhancement film 22, a quantum dot film 23 and a light diffusion film 24 stacked in sequence from top to bottom. The brightness enhancement film 21, the brightness enhancement film 22, the quantum dot film 23 and the light diffusion film 24 are all connected to the die casting 11 through a fifth limiting component 25. As one embodiment, the fifth limiting component 25 includes a third limiting groove arranged on the same side of the brightness enhancement film 21, the brightness enhancement film 22, the quantum dot film 23 and the light diffusion film 24 and a third limiting column arranged at a corresponding position of the side wall of the die casting 11 to match them, and the third limiting groove is clamped on the third limiting column to achieve limiting and fixing; the fifth limiting component 25 also includes a limiting hole arranged on the same side of the brightness enhancement film 21, the brightness enhancement film 22, the quantum dot film 23 and the light diffusion film 24 and a fourth limiting column arranged at a corresponding position of the side wall of the die casting 11 to match them, and the limiting hole is nested on the fourth limiting column to achieve limiting and fixing. In some embodiments, fixing glue may be attached between the brightness enhancement film 21 , the luminance enhancement film 22 , the quantum dot film 23 , the light diffusion film 24 and the die casting 11 .

[0060] As a further optimization, the backlight module further includes an FPC photosensitive element 4, which is mounted on the housing 1 and electrically connected to the light board 34. The FPC photosensitive element 4 can adjust the brightness of the lamp beads 342 on the light board 34 according to the external brightness to ensure the normal display of the backlight module.

[0061] The utility model provides a regional dimming backlight module, which reduces the OD (Optical Distance) value by arranging a splitter film between a diffuser plate and a lampshade, has a high display resolution, reduces the thickness of the backlight module, and makes the display device thinner and lighter; by arranging a plurality of lamp zones, partition display and regional control are realized, energy consumption is reduced, and display contrast is improved; by arranging support limit columns on the lampshade, the diffuser plate can be supported to prevent collapse, and the splitter film can be limited and fixed at the same time; by arranging reinforcing ribs, deformation of the lamp cup can be effectively prevented, and at the same time, the strength of the support limit columns can be strengthened to prevent deformation of the support limit columns; by arranging anti-shrinkage holes, shrinkage and deformation of the lampshade can be effectively prevented; by a built-in connection method, the connection between the upper frame and the die-casting is realized, the frame width of the backlight module is reduced, and the upper frame is prevented from being pulled out.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0064] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A backlight module capable of regional dimming, characterized in that: It comprises a housing (1), an optical film component (2) and a light source component (3) which are sequentially installed in the housing (1) from top to bottom; The light source assembly (3) comprises a diffusion plate (31), a beam splitter film (32), a lampshade (33) and a lamp panel (34) which are stacked in sequence from top to bottom; A plurality of lamp cups (331) are formed on the lampshade (33), a plurality of lamp areas (341) are provided on the lamp board (34), and each of the lamp cups (331) corresponds to one of the lamp areas (341).

2. The backlight module capable of local dimming according to claim 1, characterized in that: The lamp area (341) comprises a plurality of lamp beads (342), and the lamp beads (342) are packaged on the lamp board (34) by means of semicircular arc glue dispensing.

3. The regional dimming backlight module according to claim 1, characterized in that: A plurality of support and limiting columns (332) are formed on the lampshade (33), the support and limiting columns (332) are located at the intersection of four adjacent lamp cups (331), and limiting fixing holes (321) are formed on the beam splitting film (32) at positions corresponding to the support and limiting columns (332).

4. The regional dimming backlight module according to claim 1 or 3, characterized in that: A reinforcing rib (333) is formed at the intersection of the edges of each of the four adjacent lamp cups (331).

5. The backlight module capable of local dimming according to claim 4, characterized in that: A plurality of anti-shrinkage holes (334) are formed on the side of the lampshade (33).

6. The regional dimming backlight module according to claim 1, characterized in that: The housing (1) comprises a die-casting (11) and an upper frame (12) covering the die-casting (11); a cover film (13) is attached to the upper frame (12); and the optical film (2) and the light source assembly (3) are both installed in the die-casting (11).

7. The backlight module capable of local dimming according to claim 6, characterized in that: The upper frame (12) is connected to the inner side wall of the die casting (11) via a first limiting assembly (14).

8. The regional dimming backlight module according to claim 6, characterized in that: The diffusion plate (31) is connected to the die casting (11) via a second limiting assembly (35), the beam splitter (32) is connected to the die casting (11) via a third limiting assembly (36), the lampshade (33) is connected to the die casting (11) via a fourth limiting assembly (37), and the lamp panel (34) is attached to the die casting (11) via a thermally conductive adhesive (38).

9. The regional dimming backlight module according to claim 6, characterized in that: The optical film component (2) comprises a brightness enhancement film (21), a light enhancement film (22), a quantum dot film (23) and a light diffusion film (24) which are stacked in sequence from top to bottom, and the brightness enhancement film (21), the light enhancement film (22), the quantum dot film (23) and the light diffusion film (24) are all connected to the die-casting component (11) via a fifth limiting component (25).

10. The regional dimming backlight module according to claim 1, characterized in that: It also includes an FPC photosensitive element (4), which is mounted on the housing (1) and is electrically connected to the light board (34).

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