Vehicle-mounted backlight module assembly structure

Abstract

The vehicle-mounted backlight module assembly structure comprises a lower metal frame, a light-emitting strip and a light guide plate, the lower metal frame comprises a bottom plate part, a first side plate part, a second side plate part, a third side plate part and a fourth side plate part, and the first side plate part, the second side plate part, the third side plate part and the fourth side plate part are connected to the periphery of the bottom plate part. First clamping protrusions are arranged on the outer side faces of the first side plate part, the second side plate part, the third side plate part and the fourth side plate part in an outward protruding mode. A mounting cavity is defined in the lower metal frame, and the light-emitting strip and the light guide plate are located in the mounting cavity. The plastic frame comprises peripheral frame walls, and clamping grooves are formed in the inner side faces of the peripheral frame walls; the rubber frame is pressed downwards on the lower metal frame, the first clamping protrusions are buckled into the corresponding clamping grooves, and the diffusion brightness enhancement film assembly is located in the rubber frame and located above the light guide plate. Therefore, the assembling stability of the rubber frame and the lower metal frame is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of backlight modules, and in particular to an assembly structure for an automotive backlight module. Background Technology

[0002] The backlight module is one of the key components of an LCD screen. It provides a light source for the LCD screen and also plays a major supporting and protective role. The backlight module contains a supporting frame and LED light strips for display.

[0003] With the continuous development of the automotive market, backlight modules are increasingly needed in automotive applications. For example, CN114442369 A discloses an automotive backlight source, which includes an automotive backlight body, a middle frame, an FPC light strip, and a lower frame. The automotive backlight body also includes a fixing glass foam adhesive. The middle frame is installed at the bottom of the fixing glass foam adhesive. A slot is opened on one side of the outer surface of the middle frame. A light control film is installed at the bottom of the middle frame. A lower brightness enhancement film is installed at the bottom of the light control film. A diffusion film is fixedly connected to the bottom of the lower brightness enhancement film. A light guide plate is installed at the bottom of the diffusion film. A reflective film is fixedly connected to the bottom of the light guide plate. An FPC light strip is installed inside the middle frame. The FPC light strip also includes a graphene plate light strip frame. An LED light source is installed on one side of the inner wall of the graphene plate light strip frame. Heat is transferred to the aluminum alloy middle frame and the lower frame through the graphene plate light strip frame to dissipate heat by contacting the air inside the automotive display. The lower frame is engaged with the middle frame by a buckle installed on one side of the outer surface and a slot opened on one side of the outer surface of the middle frame.

[0004] Although the lower frame and middle frame are interlocked, this interlocking only occurs on one side. Furthermore, the light strip is installed inside the middle frame, resulting in less than ideal protection for the light strip from the overall structure. This is especially problematic in automotive applications where poor road conditions and significant vibrations can negatively impact internal components like the light strip over time, affecting product performance. Moreover, the overall structural layout limits the scope for technical personnel to enhance the structural strength of the middle or lower frame.

[0005] Therefore, a new technical solution needs to be researched to address the above problems. Utility Model Content

[0006] In view of this, the present invention addresses the deficiencies of the existing technology and its main purpose is to provide an assembly structure for an automotive backlight module, which effectively improves the assembly stability of the rubber frame and the lower metal frame, enhances the structural strength and vibration resistance of the entire backlight module, and is beneficial to the protection of internal light strips and other components.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An assembly structure for an automotive backlight module includes a lower metal frame, a light-emitting strip, and a light guide plate. The lower metal frame includes a base plate and a first side plate, a second side plate, a third side plate, and a fourth side plate connected around the base plate. The first side plate and the second side plate are disposed opposite each other, and the third side plate and the fourth side plate are disposed opposite each other. The outer surfaces of the first side plate, the second side plate, the third side plate, and the fourth side plate are all provided with a first latching protrusion. The second side plate is provided with a plurality of vertically penetrating hollow slots, and a reinforcing rib is formed between adjacent hollow slots. An installation cavity is formed inside the lower metal frame. The light-emitting strip is installed on the inner side of the first side plate. The light guide plate is located in the installation cavity and is located between the light-emitting side of the light-emitting strip and the second side plate.

[0009] It also includes a frame and a diffusion enhancement film assembly, wherein the frame includes four side walls and the inner side of the four side walls is provided with a slot;

[0010] The adhesive frame is pressed downward onto the lower metal frame. The first side plate, the second side plate, the third side plate, and the fourth side plate extend into the inner side of the surrounding frame wall. The first snap-fit ​​protrusion is engaged in the corresponding snap-fit ​​groove. The diffusion enhancement film assembly is located inside the adhesive frame and above the light guide plate.

[0011] As a preferred embodiment, the slot extends through the outer surface of the surrounding frame wall.

[0012] As a preferred embodiment, the outer side of the surrounding frame wall is further provided with a second locking protrusion.

[0013] As a preferred embodiment, the inner side of the surrounding frame wall extends inward with a stop edge, and the light guide plate is located below the stop edge.

[0014] As a preferred embodiment, a black and white film is attached to the top surface of the stop edge, the perimeter of the black and white film is cut into a first curved limiting edge, and the inner side of the surrounding frame wall is injection molded into a second curved limiting edge that matches the shape of the first curved limiting edge. The first curved limiting edge and the second curved limiting edge are positioned relative to each other, and the inner edge of the black and white film extends beyond the inner edge of the stop edge, so that the diffusion and brightness enhancement film assembly is located within the area enclosed by the surrounding frame wall and is positioned on the bottom surface of the inner edge of the black and white film.

[0015] As a preferred embodiment, the diffusion enhancement film assembly includes a diffusion film, a lower enhancement film, an upper enhancement film, and a DBEF film arranged sequentially from bottom to top.

[0016] As a preferred embodiment, the reinforcing ribs are connected to form a crisscrossing reinforcing grid.

[0017] As a preferred embodiment, a graphene heat dissipation layer is provided on the top surface of the base plate. The graphene heat dissipation layer is a graphene plate or a graphene film. The width of the graphene plate or graphene film is greater than or equal to the length of the light-emitting strip, and the extension length of the graphene plate or graphene film is greater than one-third of the length of the base plate.

[0018] As a preferred embodiment, the base plate is further covered with a reflective film, which covers the graphene heat dissipation layer above and is located below the light guide plate; and a reflective film strip is attached to the bottom of the stop edge on the light-emitting side near the light-emitting strip.

[0019] Compared with the prior art, this utility model has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly uses the design of a lower metal frame and a plastic frame to install the light-emitting strip and the light guide plate inside the lower metal frame. The plastic frame is pressed downward onto the lower metal frame. The first side plate, the second side plate, the third side plate, and the fourth side plate extend into the inner side of the surrounding frame wall. The first snap-fit ​​protrusion is inserted into the corresponding snap-fit ​​groove. By combining the snap-fit ​​positioning and the outer protective positioning of the side plates of the lower metal frame by the surrounding frame wall of the plastic frame, the assembly stability of the plastic frame and the lower metal frame is effectively improved. The structural strength and vibration resistance of the entire backlight module are improved, which is beneficial to the protection of internal light-emitting strips and other components, and is more suitable for use in automotive products.

[0020] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a perspective view of the assembly structure of a vehicle-mounted backlight module according to an embodiment of this utility model;

[0022] Figure 2 This is another perspective view of the vehicle-mounted backlight module assembly structure according to an embodiment of the present utility model;

[0023] Figure 3 This is a cross-sectional view of the assembly structure of the vehicle backlight module according to an embodiment of the present utility model;

[0024] Figure 4 This is an exploded view of the assembly structure of the vehicle backlight module according to an embodiment of the present utility model;

[0025] Figure 5 yes Figure 3 Enlarged view of a portion of point A in the middle;

[0026] Figure 6 yes Figure 3 Enlarged view of section B in the middle.

[0027] Explanation of reference numerals in the attached diagram:

[0028] The components include: lower metal frame 10, base plate 11, first side plate 12, second side plate 13, hollow groove 131, reinforcing rib 132, third side plate 14, fourth side plate 15, mounting cavity 16, glue frame 20, surrounding frame wall 21, second curved limiting edge 211, stop edge 22, second locking protrusion 23, light-emitting strip 30, thermally conductive adhesive strip 31, light guide plate 40, diffusion and brightness enhancement film assembly 50, diffusion film 51, lower brightness enhancement film 52, upper brightness enhancement film 53, DBEF film 54, graphene heat dissipation layer 60, reflective film 70, reflective film strip 80, first locking protrusion 101, slot 201, white film 91, black and white film 92, and first curved limiting edge 921. Detailed Implementation

[0029] Please refer to Figures 1 to 6 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0030] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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.

[0031] An assembly structure for an automotive backlight module includes a lower metal frame 10, a plastic frame 20, a light-emitting strip 30, a light guide plate 40, and a light-diffusing and light-enhancing film assembly 50.

[0032] The lower metal frame 10 is typically an iron frame, comprising a base plate 11 and four side plates 12, 13, 14, and 15 connected around the base plate 11. A white film 91 is affixed to the inner surfaces of the second side plate 13, the third side plate 14, and the fourth side plate 15. The first side plate 12 and the second side plate 13 are positioned opposite each other, and the third side plate 14 and the fourth side plate 15 are positioned opposite each other. A first retaining protrusion 101 protrudes outward from the outer surfaces of the first side plate 12, the second side plate 13, the third side plate 14, and the fourth side plate 15. The second side plate 13 is provided with several vertically penetrating hollow grooves 131, and reinforcing ribs 132 are formed between adjacent hollow grooves 131. The reinforcing ribs 132 are connected to form a crisscrossing reinforcing grid, which has good structural strength and saves injection molding material. In particular, through the design of the hollow grooves 131, the progress of the second side plate 13 is consistent with that of other side plates during injection molding, and the top surface size is well controlled. This avoids the problems caused by the large difference in progress during injection molding (such as less than ideal surface flatness) caused by the second side plate 13 being significantly wider than other side plates.

[0033] The lower metal frame 10 has an enclosure cavity 16, the light guide plate 40 is located in the enclosure cavity 16, and the diffusion enhancement film assembly 50 is located above the light guide plate 40. The diffusion enhancement film assembly 50 includes a diffusion film 51, a lower enhancement film 52, an upper enhancement film 53 and a DBEF film 54 arranged sequentially from bottom to top. The DBEF film 54 can provide brightness enhancement and high visual quality.

[0034] A graphene heat dissipation layer 60 is provided on the top surface of the base plate 11. The graphene heat dissipation layer 60 extends from the inner side of the first side plate 12 toward the inner side of the second side plate 13, and covers at least one-third of the top surface of the base plate 11. Specifically, the graphene heat dissipation layer 60 is a graphene plate or graphene film, which can be attached to the top surface of the base plate 11. The graphene plate or graphene film has a rectangular structure, the width of which is greater than or equal to the length of the light-emitting strip 30, and the extension length of the graphene plate or graphene film is greater than one-third of the length of the base plate 11. In this way, a sufficiently large graphene heat dissipation layer 60 can be provided as needed, effectively expanding the heat dissipation area, so that the heat generated by the light-emitting strip 30 can be transferred more quickly to the lower metal frame 10 and dissipated to the outside through the graphene heat dissipation layer 60, thereby improving the heat dissipation effect.

[0035] The light-emitting strip 30 is installed inside the mounting cavity 16 and is disposed along the first side plate portion 12. The light-emitting strip 30 can be attached to the inner side surface of the first side plate portion 12, for example, by bonding and fixing it to the inner side surface of the first side plate portion 12 with a thermally conductive adhesive strip 31. The light-emitting strip 30 is usually an LED light strip, which includes an FPC light board and a plurality of LEDs disposed on the FPC light board, also known as an LED light strip. The extension length direction of the LED light strip is consistent with the extension length direction of the first side plate portion 12.

[0036] The light guide plate 40 is located between the light-emitting side of the light-emitting strip 30 and the second side plate portion 13, and the graphene heat dissipation layer 60 is located below the light guide plate 40.

[0037] The base plate 11 is also covered with a reflective film 70, which covers the graphene heat dissipation layer 60 and is located below the light guide plate 40.

[0038] The frame 20 includes four side walls 21. A stop edge 22 extends inward from the inner side of the four side walls 21. A black and white film 92 is attached to the top surface of the stop edge 22. The periphery of the black and white film 92 is cut into a first curved limiting edge 921. The inner side of the four side walls 21 is injection molded into a matching second curved limiting edge 211. The first curved limiting edge 921 and the second curved limiting edge 211 are positioned relative to each other. The inner edge of the black and white film 92 extends beyond the inner edge of the stop edge 22, so that the diffusion and light enhancement film assembly 50 is located within the area enclosed by the four side walls 21 and is positioned on the bottom surface of the inner edge of the black and white film 92.

[0039] After the plastic frame 20 and the iron frame are assembled together, the stop edge 22 is located above the light-emitting strip 30 and the light guide plate 40. A reflective film strip 80 is attached to the bottom of the stop edge 22 near the light-emitting side of the light-emitting strip 30. The inner side of the four-sided frame wall 21 is provided with a slot 201. The plastic frame 20 is pressed downward onto the lower metal frame 10. The first side plate portion 12, the second side plate portion 13, the third side plate portion 14, and the fourth side plate portion 15 extend into the inner side of the four-sided frame wall 21, and the first latching protrusion 101 is engaged into the corresponding slot 201. The outer side of the four-sided frame wall 21 is also provided with a second latching protrusion 23 for assembling the vehicle backlight module in the application space.

[0040] The key design feature of this utility model lies in its design of a lower metal frame and a plastic frame. The light-emitting strip and the light guide plate are installed within the lower metal frame, while the plastic frame is pressed downwards onto the lower metal frame. The first, second, third, and fourth side plates extend into the inner side of the surrounding frame walls. The first snap-fit ​​protrusion engages with the corresponding snap-fit ​​groove. By utilizing snap-fit ​​positioning and the protective positioning of the plastic frame's surrounding frame walls for each side plate of the lower metal frame, the assembly stability of the plastic frame and the lower metal frame is effectively improved. The structural strength and vibration resistance of the entire backlight module are enhanced, which is beneficial for protecting internal components such as the light-emitting strip and makes it more suitable for automotive applications.

[0041] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. An assembly structure of a vehicle-mounted backlight module, characterized in that: comprising a lower metal frame, a light-emitting strip and a light guide plate, the lower metal frame comprises a bottom plate part and first, second, third and fourth side plate parts connected to the periphery of the bottom plate part, the first side plate part is oppositely arranged with the second side plate part, the third side plate part is oppositely arranged with the fourth side plate part, the outer side of the first, second, third and fourth side plate parts is outwardly convexly provided with a first clamping convex, the second side plate part is provided with a plurality of upper and lower through hollow grooves, and a reinforcing rib is formed between adjacent hollow grooves; the inside of the lower metal frame is peripherally provided with a mounting cavity, the light-emitting strip is mounted on the inner side of the first side plate part, and the light guide plate is located in the mounting cavity and between the light-emitting side of the light-emitting strip and the second side plate part; further comprising a glue frame and a diffusion light enhancement film assembly, the glue frame comprises a peripheral frame wall, and the inner side of the peripheral frame wall is provided with a clamping groove; the glue frame is downwardly pressed on the lower metal frame, the first, second, third and fourth side plate parts extend into the inner side of the peripheral frame wall, the first clamping convex is buckled into the corresponding clamping groove, and the diffusion light enhancement film assembly is located in the glue frame and above the light guide plate. The clamping groove penetrates the outer side of the peripheral frame wall. The outer side of the peripheral frame wall is further convexly provided with a second clamping convex. The inner side of the peripheral frame wall extends inwardly with a stop edge, and the light guide plate is located below the stop edge.

2. The backlight module assembly for vehicle according to claim 1, wherein: The top surface of the stop edge is attached with a black and white film, the periphery of the black and white film is cut into a first zigzag limiting edge, the inner side of the peripheral frame wall is injection molded into a second zigzag limiting edge which is conformally matched with the first zigzag limiting edge, the first zigzag limiting edge and the second zigzag limiting edge are positioned with each other, the inner edge of the black and white film exceeds the inner edge of the stop edge, so that the diffusion light enhancement film assembly is located in the surrounding area of the peripheral frame wall and is combined with the bottom surface of the inner edge of the black and white film.

3. The backlight module assembly for vehicle according to claim 1, wherein: The diffusion light enhancement film assembly comprises a diffusion film, a lower light enhancement film, an upper light enhancement film and a DBEF film which are sequentially arranged from bottom to top.

4. The backlight module assembly for vehicle according to claim 1, wherein: The reinforcing ribs are connected to form a reinforcing grid which is longitudinally and transversely crossed.

5. The backlight module assembly for vehicle according to claim 4, wherein: The top surface of the bottom plate part is provided with a graphene heat dissipation layer, the graphene heat dissipation layer is a graphene plate or a graphene film, the width of the graphene plate or the graphene film is greater than or equal to the length of the light-emitting strip, and the extension length of the graphene plate or the graphene film is greater than one third of the length of the bottom plate part.

6. The backlight module assembly for vehicle according to claim 5, wherein: The bottom plate part is further covered with a reflective film, the reflective film covers the top of the graphene heat dissipation layer and is located below the light guide plate; and the bottom of the stop edge is attached with a reflective film strip near the light-emitting side of the light-emitting strip.

7. The backlight module assembly for vehicle according to claim 1, wherein: ​ 8. The backlight module assembly for vehicle according to claim 4, wherein: ​ 9. The vehicle-mounted backlight module assembly structure according to claim 8, characterized in that: ​

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