Backlight module with automatic brightness adjustment

Abstract

The utility model relates to display device technical field discloses a kind of backlight module of automatic adjustment luminance, including installation shell, reflecting film, light guide plate, optical film piece and installation frame body, the reflecting film, the light guide plate and the optical film piece are sequentially stacked in the installation shell inside from below to top, the installation frame body cover is located on the installation shell;The sidewall of the installation shell inside corresponding to the light guide plate light entrance side is provided with light source assembly, the outer wall of the installation frame body corresponding to the light source assembly one side is provided with light sense component, the light sense component includes light sense FPC and the photosensitive component for setting on the light sense FPC, the light sense FPC is electrically connected with the light source assembly, the outer periphery of the photosensitive component is provided with protection part.The utility model plays the following technical effects: by setting protection part, effectively absorbing vibration and impact, prevent the damage of photosensitive component, while effectively blocking dust, guarantee the sensing sensitivity of photosensitive component.

Description

Technical Field

[0001] This utility model belongs to the field of display device technology, and specifically relates to a backlight module with automatic brightness adjustment. Background Technology

[0002] Because in-vehicle displays are exposed to natural light during daily use, and the brightness of natural light differs significantly between day and night, the brightness of the displays needs to be adjusted adaptively according to the intensity of natural light to achieve the best display effect. As a key display component, the backlight module determines the overall display effect, and brightness adjustment is achieved through the backlight module.

[0003] Existing backlight modules adjust the brightness of the light source module by setting photoresistors and other photosensitive devices on the light source module. Since the in-vehicle display screen is set inside the vehicle, and the vehicle will inevitably experience vibration or bumps during driving, the photoresistors are easily damaged during long-term use, thus affecting the brightness adjustment function of the backlight module. At the same time, due to the influence of the usage environment, dust is also easily attracted to the surface of the photoresistor, thus affecting the sensing sensitivity of the photoresistor. Utility Model Content

[0004] To address the shortcomings of the prior art, this utility model provides an automatically adjustable brightness backlight module. By setting a protective component around the photosensitive component, it can effectively absorb vibration and impact, preventing damage to the photosensitive component. At the same time, it can prevent dust from contacting the photosensitive component, reducing the amount of dust adhering to the surface of the photosensitive component and ensuring the sensing sensitivity of the photosensitive component.

[0005] The technical effects to be achieved by this utility model are realized through the following technical aspects: This utility model provides an automatically adjustable brightness backlight module for vehicle display screens, including a mounting housing, a reflective film, a light guide plate, an optical film, and a mounting frame. The reflective film, the light guide plate, and the optical film are stacked sequentially from bottom to top inside the mounting housing, and the mounting frame covers the mounting housing. A light source assembly is provided on the side wall of the mounting housing corresponding to the light-incident side of the light guide plate. A light-sensing assembly is provided on the outer wall of the mounting frame corresponding to the light source assembly. The light-sensing assembly includes a light-sensing FPC and a photosensitive element disposed on the light-sensing FPC. The light-sensing FPC is electrically connected to the light source assembly. A protective component is provided on the outer periphery of the photosensitive element.

[0006] As a further description of the technical solution of this utility model, the light source assembly is fixed to the inner wall of the mounting housing by thermally conductive adhesive, and the light sensing assembly is fixed to the outer wall of the mounting frame by a first fixing adhesive.

[0007] As a further description of the technical solution of this utility model, the light source assembly includes a light source FPC and a plurality of lamp beads arranged on the light source FPC. The plurality of lamp beads correspond to the light incident side of the light guide plate. The light source FPC has a first extension end. The bottom of the mounting housing is provided with a first through hole. The first extension end extends through the first through hole to the outside of the bottom of the mounting housing. The photosensitive FPC has a second extension end, and the side wall of the mounting housing has a second through hole. The second extension end extends through the second through hole to the bottom outer side of the mounting housing. The first extension end and the second extension end are electrically connected. Protective adhesive is applied to the bottom outer side of the mounting housing at positions corresponding to the first through hole and the second through hole, respectively.

[0008] As a further description of the technical solution of this utility model, the inner wall of the mounting housing is provided with a plurality of receiving grooves corresponding to the non-light-incident side of the light guide plate. The receiving grooves are provided with limiting silicone, the limiting silicone is interference-connected with the light guide plate, and the limiting silicone is provided with a protrusion structure on the side facing the light guide plate.

[0009] As a further description of the technical solution of this utility model, a second fixing adhesive is affixed between the light guide plate and the bottom wall of the mounting housing, a plurality of limiting posts are provided on the top edge of the light guide plate, and limiting holes for engaging with the limiting posts are correspondingly provided on the mounting frame.

[0010] As a further description of the technical solution of this utility model, the optical film includes a light-diffusing film, a light-enhancing film and a brightness-enhancing film stacked sequentially from bottom to top. The edges of the light-diffusing film, the light-enhancing film and the brightness-enhancing film are all provided with a limiting snap-fit ​​structure, and the limiting snap-fit ​​structure is snapped with the limiting post.

[0011] As a further description of the technical solution of this utility model, the inner sidewalls on both sides of the mounting housing are provided with insertion grooves, and the edge of the brightening film is provided with a limiting lug for insertion into the insertion groove.

[0012] As a further description of the technical solution of this utility model, the edge of the mounting frame is provided with a plug for insertion into the insertion slot.

[0013] As a further description of the technical solution of this utility model, the top of the mounting housing is provided with a plurality of limiting grooves, and the edge of the mounting frame is provided with a limiting bending structure that matches the limiting grooves. A third fixing adhesive is attached between the limiting bending structure and the bottom wall of the limiting groove.

[0014] As a further description of the technical solution of this utility model, a surface protective film is also attached to the outer wall of the mounting frame, and a clearance groove is opened on the surface protective film corresponding to the position of the light sensing component.

[0015] In summary, this utility model has at least the following advantages: The automatic brightness adjustment backlight module provided by this utility model, by setting a protective component on the outer periphery of the photosensitive component, can effectively absorb vibration and impact, prevent damage to the photosensitive component caused by vibration or bumps during vehicle operation, and help extend the service life of the photosensitive component. On the other hand, it can prevent dust from contacting the photosensitive component, effectively reducing the amount of dust adhering to the surface of the photosensitive component, thereby helping to maintain the sensing sensitivity of the photosensitive component and improve the stability of the automatic brightness adjustment function of the backlight module. Attached Figure Description

[0016] Figure 1 This is an exploded view of the automatically brightness-adjusting backlight module of Embodiment 1 of this utility model; Figure 2 This is a top view of the automatically brightness-adjustable backlight module of Embodiment 1 of this utility model; Figure 3 for Figure 2 Enlarged view of section A; Figure 4 This is an exploded view of the mounting housing, light source assembly, and light sensor assembly of Embodiment 2 of this utility model; Figure 5 This is a schematic diagram of the mounting housing, light guide plate, and mounting frame of Embodiment 3 of this utility model; Figure 6 This is a schematic diagram of the limiting silicone of Embodiment 3 of this utility model; Figure 7 for Figure 5 Enlarged view of section B; Figure 8 This is a schematic diagram of the mounting housing, light guide plate, and optical film of Embodiment 3 of this utility model; Figure 9 for Figure 8 Enlarged view of section C; Figure 10 for Figure 8 Enlarged view of section D; Figure 11 for Figure 8 Enlarged view of section E in the middle; Figure 12 This is a schematic diagram of the mounting shell, mounting frame, and surface protective film of Embodiment 3 of this utility model; Figure 13 for Figure 12 Enlarged view of section F in the middle; Figure 14 for Figure 12 Enlarged view of section G in the middle; Figure 15 for Figure 12 Enlarged view of section H in the middle.

[0017] Marked in the image: 1. Mounting housing; 11. First through hole; 12. Second through hole; 13. Protective adhesive; 14. Receiving groove; 15. Limiting silicone; 151. Raised dot structure; 16. Insertion groove; 17. Limiting groove; 2. Reflective film; 3. Light guide plate; 31. Second fixing adhesive; 32. Limiting post; 4. Optical film components; 41. Diffusing film; 42. Brightness enhancement film; 43. Brightness enhancement film; 44. Limiting snap-fit ​​structure; 45. Limiting lug; 5. Mounting frame; 51. Limiting hole; 52. Insert block; 53. Limiting bending structure; 54. Third fixing adhesive; 6. Light source assembly; 61. Thermally conductive adhesive; 62. Light source FPC; 63. Lamp chip; 64. First extension end; 7. Light-sensing component; 71. Light-sensing FPC; 72. Photosensitive element; 73. Protective component; 74. First fixing adhesive; 75. Second extension end; 8. Surface protective film; 81. Alternating groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0019] 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 to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] Example 1 refer to Figures 1 to 3 The automatic brightness adjustment backlight module provided by this utility model is used for vehicle display screens. It includes a mounting housing 1, a reflective film 2, a light guide plate 3, an optical film 4, and a mounting frame 5. The reflective film 2, the light guide plate 3, and the optical film 4 are stacked in sequence from bottom to top inside the mounting housing 1. The mounting frame 5 covers the mounting housing 1 and can confine the reflective film 2, the light guide plate 3, and the optical film 4 inside the mounting housing.

[0021] A light source assembly 6 is disposed on the side wall of the mounting housing 1 corresponding to the light-incident side of the light guide plate 3, and a light sensor assembly 7 is disposed on the outer top wall of the mounting frame 5 corresponding to the side of the light source assembly 6. The light sensor assembly 7 includes a light-sensing FPC 71 and a photosensitive element 72 disposed on the light-sensing FPC 71. Several electronic components are also disposed on the light-sensing FPC 71. The light-sensing FPC 71 is electrically connected to the light source assembly 6. The photosensitive element 72 can sense the light intensity of the environment. The light-sensing FPC 71 is used to control and drive the operation of the photosensitive element 72 and to convert light signals into electrical signals and transmit them to the light source assembly 6, thereby realizing automatic adjustment of the backlight module's display brightness. By dynamically adjusting the display brightness of the backlight module, visual comfort and driving safety can be improved, while reducing the energy consumption of the vehicle display screen, conforming to the concepts of energy conservation, environmental protection, and sustainable development. In some embodiments, the photosensitive element 72 can be a photoresistor, an optical diode, or an optical transistor, etc.

[0022] Furthermore, a protective element 73 is provided around the photosensitive component 72. In this embodiment, the protective element 73 is specifically protective foam. The protective foam located around the photosensitive component 72 can absorb the vibration or impact generated during vehicle operation, thus protecting the photosensitive component 72 from damage and extending its service life. Simultaneously, due to its fine porous structure, the protective foam can adsorb dust, preventing dust from contacting the photosensitive component 72 and reducing the amount of dust adhering to its surface. This helps maintain the sensing sensitivity of the photosensitive component 72, thereby improving the stability of the backlight module's automatic brightness adjustment function.

[0023] In some embodiments, the light source assembly 6 is attached to the inner wall of the mounting housing 1 by thermally conductive adhesive 61, and the light sensing assembly 7 is attached to the outer top wall of the mounting frame 5 by first adhesive 74.

[0024] Example 2 As a further optimization of Example 1, in Figures 1 to 3 Based on, refer to Figure 4The light source assembly 6 includes a light source FPC 62 and a plurality of lamp beads 63 arranged on the light source FPC 62. The plurality of lamp beads 63 correspond to the light-incident side of the light guide plate 3. The light source FPC 62 has a first extension end 64. A first through hole 11 is provided on the bottom of the mounting housing 1 near the side of the light source FPC 62. The first extension end 64 extends through the first through hole 11 to the outside of the bottom of the mounting housing 1. The first extension end 64 can be electrically connected to external components.

[0025] In some embodiments, the light source assembly 6 may include one light source FPC 62 or two light source FPC 62. When two light source FPC 62 are included, the two light source FPC 62 are arranged adjacently on the same side wall of the mounting housing 1 and connected to each other. Both light source FPC 62 are provided with a plurality of lamp beads 63 and are provided with a first extension end 64.

[0026] In this embodiment, the photosensitive FPC 71 also has a second extension end 75. A second through hole 12 is provided vertically on the side wall of the mounting housing 1. The second extension end 75 extends through the second through hole 12 to the bottom outer side of the mounting housing 1. The second extension end 75 is electrically connected to the first extension end 64. It can be understood that the photosensitive FPC 71 and the photosensitive element 72 disposed on the photosensitive FPC 71 are both located on the outer top wall of the mounting frame 5, while the second extension end 75 is formed on the side of the photosensitive FPC 71 and extends outward. The second extension end 75 can pass through the second through hole 12 from one side of the mounting frame 5 and reach the bottom outer side of the mounting housing 1.

[0027] As a further optimization, protective adhesive 13 is applied to the bottom outer side of the mounting housing 1 at the positions corresponding to the first through hole 11 and the second through hole 12. The protective adhesive 13 can cover the part of the first extension end 64 that protrudes from the first through hole 11 and the part of the second extension end 75 that protrudes from the second through hole 12, thereby protecting the first extension end 64 and the second extension end 75 and preventing the first extension end 64 and the second extension end 75 from being scratched by other external components.

[0028] Example 3 As a further optimization of Example 2, in Figures 1 to 4 Based on, refer to Figures 5 to 15 The inner wall of the mounting housing 1 is provided with multiple receiving grooves 14 corresponding to the non-light-incident side of the light guide plate 3. The receiving grooves 14 can be located on opposite sides and two end corners of the non-light-incident side of the light guide plate 3. The receiving grooves 14 are provided with limiting silicone 15. The limiting silicone 15 can be fixed in the receiving grooves 14 by adhesive. The limiting silicone 15 is interference-fitted with the light guide plate 3, thereby limiting and fixing the light guide plate 3 in the horizontal X and Y directions. This can effectively prevent the light guide plate 3 from arching during the three-in-one test or from shaking or making abnormal noises during use, thus affecting the display effect of the backlight module.

[0029] It should be noted that the receiving grooves 14 on the opposite sides of the non-light-incident side of the light guide plate 3 are in the shape of a straight line, and the limiting silicone 15 inside them is also in the shape of a straight line. The receiving grooves 14 at the two end corners of the non-light-incident side of the light guide plate 3 are in the shape of an L, and the limiting silicone 15 inside them is also in the shape of an L.

[0030] As a further optimization, the limiting silicone 15 is provided with a protrusion structure 151 on the side facing the light guide plate 3. The protrusion structure 151 can increase the interference fit force and friction between the limiting silicone 15 and the light guide plate 3, which can further improve the connection stability and reliability between the light guide plate 3 and the mounting housing 1.

[0031] A second adhesive 31 is applied between the light guide plate 3 and the bottom wall of the mounting housing 1. It should be noted that the reflective film 2 is applied to the bottom wall of the mounting housing 1. The side of the reflective film 2 closest to the light source assembly 6 and the side furthest from the light source assembly 6 have a certain gap from the inner wall of the mounting housing 1, which can be used to apply the second adhesive 31, thereby achieving the bonding and fixation between the light guide plate 3 and the bottom wall of the mounting housing 1. In some embodiments, a reflective film can also be applied between the opposite sides of the non-light-incident side of the light guide plate 3 and the inner wall of the mounting housing 1.

[0032] The top edge of the light guide plate 3 is provided with multiple limiting posts 32, and the mounting frame 5 is provided with corresponding limiting holes 51 for engaging with the limiting posts 32. In this embodiment, the limiting posts 32 are located on the top edge of the light guide plate 3 near the light-incident side and on the top edge away from the light-incident side. When the mounting frame 5 is closed on the mounting housing 1, the limiting holes 51 are precisely aligned and engaged with the limiting posts 32. Combined with the adhesive fixing effect of the second fixing adhesive 31, the light guide plate 3 is limited and fixed in the vertical Z direction, which can further improve the stability of the position of the light guide plate 3.

[0033] In this embodiment, the optical film 4 includes a diffuser film 41, a brightness enhancement film 42, and a brightening film 43 stacked sequentially from bottom to top, wherein the brightening film 43 can be a DBEF film. Each of the diffuser film 41, brightness enhancement film 42, and brightening film 43 has a limiting engagement structure 44 along its edge, which engages with a limiting post 32. The positions of the limiting engagement structures 44 correspond to the positions of the limiting posts 32. The limiting engagement structures 44 can all be hole-shaped structures, all be groove-shaped structures, or a combination of hole-shaped and groove-shaped structures. Through the engagement of the limiting engagement structures 44 with the limiting posts 32, the optical film 4 can be limited and fixed in the horizontal X and Y directions, preventing loosening and detachment of the optical film 4, which helps ensure the display effect of the backlight module.

[0034] In some embodiments, insertion slots 16 are provided on the inner sidewalls of opposite sides of the mounting housing 1, and corresponding limiting lugs 45 are provided on the edges of the brightness enhancement film 43 for insertion into the insertion slots 16. The limiting lugs 45 can be located on different sides of the brightness enhancement film 43 respectively with the limiting snap-fit ​​structure 44. By inserting the limiting lugs 45 into the insertion slots 16, the brightness enhancement film 43 is limited and fixed in the vertical Z direction. Since the brightness enhancement film 43 is located above the diffuser film 41 and the brightness enhancement film 42, it can also limit the diffuser film 41 and the brightness enhancement film 42 in the Z direction, thereby further improving the fixation of the optical film 4 position.

[0035] In this embodiment, the edge of the mounting frame 5 is also provided with a corresponding insertion block 52 for insertion into the insertion slot 16. The position of the insertion block 52 corresponds to the position of the insertion slot 16, and the insertion block 52 extends outward from the outer edge of the mounting frame 5 in a horizontal direction. Through the insertion and engagement of the insertion block 52 with the insertion slot 16, the mounting frame 5 can be limited and fixed in the horizontal X and Y directions.

[0036] In some embodiments, the top of the mounting housing 1 is provided with a plurality of limiting grooves 17, and the edge of the mounting frame 5 is provided with a limiting bending structure 53 that matches the limiting groove 17. The limiting bending structure 53 is formed by extending vertically upward from the outer edge of the mounting frame 5 and bending outward in the horizontal direction. The limiting bending structure 53 can be located on the same side of the mounting frame 5 as the insert block 52. A third fixing adhesive 54 is attached between the limiting bending structure 53 and the bottom wall of the limiting groove 17.

[0037] It is understood that the shape of the limiting bending structure 53 matches the shape of the limiting groove 17. In this embodiment, the limiting bending structure 53 can all be in a straight line, or all be in a T-shape, or a combination of straight and T-shapes. The limiting bending structure 53 is directly placed in the limiting groove 17, and the connection and fixation between the limiting bending structure 53 and the limiting groove 17 are achieved by bonding and fixing with the third fixing adhesive 54. Through the bonding and fixing of the limiting bending structure 53 and the limiting groove 17, the mounting frame 5 can be limited and fixed in the vertical Z direction.

[0038] In some embodiments, a fourth fixing adhesive can be applied between the top of the inner sidewall of the mounting frame 5 and the mounting housing 1, and an edge-sealing adhesive can be provided. The edge-sealing adhesive is used to cover the connection between the outer edge of the mounting frame 5 and the mounting housing 1, thereby preventing the mounting frame 5 from peeling outward and further improving the connection stability and reliability between the mounting frame 5 and the mounting housing 1.

[0039] In some embodiments, a fifth adhesive can be applied between the diffuser film 41, the brightness enhancement film 42, and the brightness enhancement film 43 and the light guide plate 3. The fifth adhesive can be stepped, with different steps on the fifth adhesive bonding to different film components. This can further improve the connection stability between the light guide plate 3 and the optical film component 4. At the same time, a sixth adhesive can be applied between the diffuser film 41, the brightness enhancement film 42, and the brightness enhancement film 43, and a seventh adhesive can be applied between the brightness enhancement film 43 and the mounting frame 5. This makes the connection between the optical film component 4 and other structures more stable, which is beneficial to improving the overall connection reliability of the backlight module.

[0040] In this embodiment, a surface protective film 8 is also attached to the outer wall of the mounting frame 5. The surface protective film 8 can be attached and fixed to the surface of the mounting frame 5 by foam double-sided adhesive to protect the optical film 4 and light source assembly 6 located in the mounting housing 1. The surface protective film 8 has a clearance groove 81 corresponding to the position of the light sensing assembly 7.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A backlight module with automatic brightness adjustment for use in vehicle-mounted displays, characterized in that, The system includes a mounting housing (1), a reflective film (2), a light guide plate (3), an optical film (4), and a mounting frame (5). The reflective film (2), the light guide plate (3), and the optical film (4) are stacked sequentially from bottom to top inside the mounting housing (1), and the mounting frame (5) covers the mounting housing (1). A light source assembly (6) is provided on the side wall of the mounting housing (1) corresponding to the light-incident side of the light guide plate (3). A light sensing assembly (7) is provided on the outer wall of the mounting frame (5) corresponding to the side of the light source assembly (6). The light sensing assembly (7) includes a light sensing FPC (71) and a photosensitive element (72) disposed on the light sensing FPC (71). The light sensing FPC (71) is electrically connected to the light source assembly (6). A protective component (73) is provided on the outer periphery of the photosensitive element (72).

2. The backlight module with automatic brightness adjustment according to claim 1, characterized in that, The light source assembly (6) is attached to the inner wall of the mounting housing (1) by thermally conductive adhesive (61), and the light sensor assembly (7) is attached to the outer wall of the mounting frame (5) by first adhesive (74).

3. The backlight module with automatic brightness adjustment according to claim 1, characterized in that, The light source assembly (6) includes a light source FPC (62) and a plurality of lamp beads (63) arranged on the light source FPC (62). The plurality of lamp beads (63) correspond to the light-incident side of the light guide plate (3). The light source FPC (62) has a first extension end (64). The bottom of the mounting housing (1) is provided with a first through hole (11). The first extension end (64) extends through the first through hole (11) to the outside of the bottom of the mounting housing (1). The photosensitive FPC (71) has a second extension end (75), and the side wall of the mounting housing (1) has a second through hole (12). The second extension end (75) extends through the second through hole (12) to the bottom outer side of the mounting housing (1). The first extension end (64) is electrically connected to the second extension end (75). Protective adhesive (13) is applied to the bottom outer side of the mounting housing (1) at the positions corresponding to the first through hole (11) and the second through hole (12).

4. The backlight module with automatic brightness adjustment according to claim 1, characterized in that, The inner wall of the mounting housing (1) is provided with a plurality of receiving grooves (14) corresponding to the non-light-incident side of the light guide plate (3). The receiving grooves (14) are provided with limiting silicone (15). The limiting silicone (15) is interference-connected to the light guide plate (3). The limiting silicone (15) is provided with a protrusion structure (151) on the side facing the light guide plate (3).

5. The backlight module with automatic brightness adjustment according to claim 4, characterized in that, A second fixing adhesive (31) is attached between the light guide plate (3) and the bottom wall of the mounting housing (1). A plurality of limiting posts (32) are provided on the top edge of the light guide plate (3). A limiting hole (51) for engaging with the limiting post (32) is provided on the mounting frame (5).

6. The backlight module with automatic brightness adjustment according to claim 5, characterized in that, The optical film (4) includes a diffuser film (41), a brightening film (42) and a brightness enhancement film (43) stacked sequentially from bottom to top. The edges of the diffuser film (41), the brightening film (42) and the brightness enhancement film (43) are provided with a limiting snap-fit ​​structure (44), which snaps into the limiting post (32).

7. The backlight module with automatic brightness adjustment according to claim 6, characterized in that, The mounting housing (1) has insertion slots (16) on the inner sidewalls on both sides, and the edge of the brightening film (43) is provided with a limiting lug (45) for insertion into the insertion slot (16).

8. The backlight module with automatic brightness adjustment according to claim 7, characterized in that, The mounting frame (5) is provided with a plug (52) on its edge for insertion into the insertion slot (16).

9. The backlight module with automatic brightness adjustment according to claim 8, characterized in that, The top of the mounting housing (1) is provided with multiple limiting grooves (17), and the edge of the mounting frame (5) is provided with a limiting bending structure (53) that matches the limiting groove (17). A third fixing adhesive (54) is attached between the limiting bending structure (53) and the bottom wall of the limiting groove (17).

10. The backlight module with automatic brightness adjustment according to claim 1, characterized in that, The outer wall of the mounting frame (5) is also covered with a surface protective film (8), and the surface protective film (8) has a recessed groove (81) corresponding to the position of the light sensor component (7).

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