Direct type backlight module

Abstract

The utility model discloses a direct type backlight module which comprises a die casting and a middle iron frame, the middle iron frame covers the die casting to form a containing cavity between the die casting and the middle iron frame, and a lamp panel and an optical assembly are sequentially arranged in the containing cavity from bottom to top. The peripheral side of the die casting is coated with edge covering glue, and the edge covering glue extends upwards to the peripheral side of the middle iron frame and is bent downwards to the bottom of the die casting. According to the direct type backlight module, the peripheral side of the die casting is coated with the edge covering glue, and the edge covering glue extends upwards to the peripheral side of the middle iron frame and is bent downwards to the bottom of the die casting, so that the bending positions of the peripheral side and the bottom of the die casting and the connecting position of the die casting and the middle iron frame are shaded through the edge covering glue; the light leakage situation of the narrow frame is avoided, and a large visual area can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal display, in particular to a direct-lit backlight module. Background Art

[0002] Traditional in-vehicle liquid crystal displays adopt side-lit backlight modules, which paste the light bars on the inner side wall of the frame. The relatively wide frame limits the visible area and cannot meet the user's needs.

[0003] Chinese Patent CN218917873U discloses a backlight module with a limiting structure, which uses a lamp board instead of a light bar to form a direct-lit backlight module with a narrow frame, so as to obtain a larger visible area. However, there is a problem of light leakage in the narrow frame. Summary of the Utility Model

[0004] In order to overcome at least one of the above-mentioned defects of the prior art, the utility model provides a direct-lit backlight module, which not only has a narrow frame to obtain a larger visible area, but also avoids light leakage.

[0005] The technical solution adopted by the utility model to solve its problems is as follows:

[0006] A direct-lit backlight module includes: a die-cast part and an iron middle frame. The iron middle frame covers the die-cast part to form a receiving cavity therebetween. A lamp board and an optical component are sequentially arranged in the receiving cavity from bottom to top;

[0007] The circumferential side of the die-cast part is coated with a wrapping glue, and the wrapping glue extends upward to the circumferential side of the iron middle frame and bends downward to the bottom of the die-cast part.

[0008] Further, the die-cast part includes a back plate and side plates. The side plates are arranged at the circumferential edge of the back plate and extend towards the iron middle frame. The iron middle frame includes a ring iron frame and a plurality of lugs arranged at intervals. The plurality of lugs extend from the ring iron frame towards the die-cast part and are fixedly connected to the outer wall of the side plates.

[0009] Further, the outer wall of the side plate is provided with a groove corresponding to the lug, a clamping block protrudes from the groove, and a clamping groove is opened on the lug corresponding to the clamping block. The clamping block is clamped in the corresponding clamping groove so that the die-cast part and the iron middle frame are detachably connected.

[0010] Further, the lamp board covers the back plate, a limiting block protrudes from the back plate towards the lamp board, and a limiting groove adapted to the limiting block is opened on the lamp board. The limiting block is clamped in the corresponding limiting groove.

[0011] Further, the lamp board and the back plate are fixedly connected by bolts.

[0012] Further, the upper end of the side plate is concave to form a step, the side part of the optical component extends towards the step to form a connecting part, and the connecting part is fixedly bonded to the step.

[0013] Furthermore, the optical component includes a diffusion plate and an optical film disposed in sequence from bottom to top. The diffusion plate is adhesively fixed between the step and the optical film.

[0014] Furthermore, the optical film includes a lower brightness enhancement film, an upper brightness enhancement film, and a brightness enhancement film disposed in sequence from bottom to top. The diffusion plate is adhesively fixed between the lower brightness enhancement film and the upper brightness enhancement film, and the upper brightness enhancement film is adhesively fixed between the upper brightness enhancement film and the brightness enhancement film.

[0015] Furthermore, the middle iron frame is provided with a foam adhesive, and the foam adhesive is provided around the middle iron frame.

[0016] Furthermore, a light-shielding strip is provided between the die-cast part and the middle iron frame. The light-shielding strip abuts against the side plate and the middle iron frame, and the light-shielding strip is located on the periphery of the optical component.

[0017] The beneficial effects of the direct-lit backlight module provided by the present utility model are as follows:

[0018] By covering the periphery of the die-cast part with an edge-sealing adhesive, and the edge-sealing adhesive extends upward to the periphery of the middle iron frame and bends downward to the bottom of the die-cast part, the periphery and the bottom bending part of the die-cast part and the connection part between the die-cast part and the middle iron frame are all shielded from light by the edge-sealing adhesive, avoiding light leakage in the narrow border situation, and ensuring a large visible area. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the direct-lit backlight module of the present utility model;

[0020] Figure 2 is an exploded view of the direct-lit backlight module of the present utility model;

[0021] Figure 3 is an assembly diagram of the die-cast part and the middle iron frame of the present utility model;

[0022] Figure 4 is an exploded view of the die-cast part, the lamp board, and the optical component.

[0023] Among them, the meanings of the reference numerals are as follows:

[0024] 1. Die-cast part; 11. Back plate; 111. Limiting block; 12. Side plate; 121. Block; 122. Groove; 123. Step; 2. Middle iron frame; 21. Middle iron frame; 22. Lug; 221. Card slot; 3. Lamp board; 31. Limiting groove; 4. Optical component; 41. Connection part; 42. Diffusion plate; 43. Optical film; 431. Lower brightness enhancement film; 432. Upper brightness enhancement film; 433. Brightness enhancement film; 5. Edge-sealing adhesive; 6. Foam adhesive; 7. Light-shielding strip; 8. Bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] For better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0026] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0028] Referring to Figure 1 and Figure 2 , the present utility model discloses a direct-lit backlight module, which includes a die-cast part 1 and an iron middle frame 2. The iron middle frame 2 covers the die-cast part 1 to form a receiving cavity therebetween. A lamp board 3 and an optical component 4 are sequentially arranged in the receiving cavity from bottom to top. The peripheral side of the die-cast part 1 is coated with an edge-sealing glue 5. The edge-sealing glue 5 extends upward to the peripheral side of the iron middle frame 2 and bends downward to the bottom of the die-cast part 1.

[0029] Thus, by coating the edge-sealing glue 5 on the peripheral side of the die-cast part 1, and the edge-sealing glue 5 extending upward to the peripheral side of the iron middle frame 2 and bending downward to the bottom of the die-cast part 1, the peripheral side and the bottom bending part of the die-cast part 1, and the connection part between the die-cast part 1 and the iron middle frame 2 are all shaded by the edge-sealing glue 5, avoiding the occurrence of light leakage in the narrow border and ensuring a large visible area.

[0030] Referring to Figure 2 and Figure 3 , the die-cast part 1 includes a back plate 11 and side plates 12. The side plates 12 are arranged at the circumferential edge of the back plate 11 and extend towards the iron middle frame 2. The side plates 12 and the back plate 11 are of an integral structure to ensure the strength and light-shielding effect of the die-cast part 1. The iron middle frame 2 includes an annular iron frame 21 and a plurality of lugs 22 arranged at intervals. The plurality of lugs 22 extend from the annular iron frame 21 towards the die-cast part 1 and are fixedly connected to the outer wall of the side plates 12. The annular iron frame 21 covers the optical component 4 to ensure the structural stability of the backlight module. The lugs 22 extend downward from the peripheral side of the annular iron frame 21 and fit the outer wall of the side plates 12 to ensure the stable connection between the die-cast part 1 and the iron middle frame 12.

[0031] The connection between the lug 22 and the side plate 12 can be achieved by welding, but it is difficult to disassemble, making it inconvenient to replace the internal lamp board 3 and optical component 4. For this reason, a groove 122 is provided on the outer wall of the side plate 12 of the present utility model corresponding to the lug 22, and a clamping block 121 protrudes from the groove 122. The lug 22 is provided with a clamping groove 221 corresponding to the clamping block 121, and the clamping block 121 is clamped in the corresponding clamping groove 221 so that the die-casting part 1 and the middle iron frame 2 can be detachably connected. The clamping connection between the clamping block 121 and the clamping groove 221 can ensure the stable connection between the die-casting part 1 and the middle iron frame 2, and is detachable to facilitate the replacement of the internal lamp board 3 and optical component 4.

[0032] Based on the above structure, referring to Figure 4 , the lamp board 3 covers the back plate 11. The back plate 11 protrudes towards the lamp board 3 with a limiting block 111, and the lamp board 3 is provided with a matching limiting groove 31 corresponding to the limiting block 111. The limiting block 111 is clamped in the corresponding limiting groove 31. There are four limiting blocks 111, which are respectively located in the middle of the front side, the middle of the rear side, the middle of the left side, and the middle of the right side in the circumferential direction of the back plate 11. The number of the limiting grooves 31 is equal to the number of the limiting blocks 111, and the positions of the limiting grooves 31 correspond to the positions of the limiting blocks 111 one by one. Thus, the lamp board 3 can be clamped in the die-casting part 1 through the clamping connection between the limiting block 111 and the limiting groove 31.

[0033] To further improve the installation stability of the lamp board 3, the lamp board 3 and the back plate 11 are fixedly connected by bolts 8. Since the peripheral side of the lamp board 3 is fixed by a snap structure, therefore, the bolts 8 are installed in the middle area of the lamp board 3. There are multiple bolts 8, and the multiple bolts 8 are evenly spaced to enable the lamp board 3 to be firmly installed on the back plate 11.

[0034] The lamp board 3 of the present utility model is a Mini-LED lamp board, which includes a circuit board and a number of Mini-LED chips installed on the circuit board. The number of Mini-LED chips are arranged in a matrix on the circuit board to ensure a uniform light source.

[0035] The optical component 4 is arranged above the lamp board 3, and the optical component 4 covers the lamp board 3. The upper end of the side plate 12 is recessed to form a step 123. The side part of the optical component 4 extends towards the step 123 to form a connecting part 41, and the connecting part 41 is adhesively fixed to the step 123. There may be a number of steps 123 and connecting parts 41 with equal numbers and corresponding positions one by one. The connecting part 41 is placed on the corresponding step 123, that is, the bottom surface of the connecting part 41 abuts against the top surface of the step 123, and the two are adhesively fixed by double-sided tape, thereby fixing the optical component 4 on the die-casting part 1.

[0036] On the basis that there are multiple connecting parts 41 and steps 123, adhesive fixation can be carried out between a group of corresponding connecting parts 41 and steps 123. Of course, multiple groups can also be selected for adhesive fixation to improve the stability of the installation of the optical component 4.

[0037] The optical component 4 includes a diffusion plate 42 and an optical film 43 arranged in sequence from bottom to top. The diffusion plate 42 is adhesively fixed between the step 123 and between the diffusion plate 42 and the optical film 43. Both the diffusion plate 42 and the optical film 43 are provided with connecting parts 41. Moreover, the adhesion between the diffusion plate 42 and the step 123 is that the connecting part 41 of the diffusion plate 42 is adhesively bonded to the step 123, and the connecting part 41 of the diffusion plate 42 is adhesively bonded to the connecting part 41 of the optical film 43, and both are adhesively bonded through double-sided tape.

[0038] The optical film 43 includes a lower brightness enhancement film 431, an upper brightness enhancement film 432 and a brightness enhancement film 433 arranged in sequence from bottom to top. The diffusion plate 42 is adhesively fixed between the lower brightness enhancement film 431, between the lower brightness enhancement film 431 and the upper brightness enhancement film 432, and between the upper brightness enhancement film 432 and the brightness enhancement film 433. The lower brightness enhancement film 431, the upper brightness enhancement film 432 and the brightness enhancement film 433 can improve the light output effect of the backlight module. Both the lower brightness enhancement film 431, the upper brightness enhancement film 432 and the brightness enhancement film 433 are provided with connecting parts 41. And the adhesion between the diffusion plate 42 and the lower brightness enhancement film 431 is that the connecting part 41 of the diffusion plate 42 is adhesively bonded to the connecting part 41 of the lower brightness enhancement film 431, the adhesion between the lower brightness enhancement film 431 and the upper brightness enhancement film 432 is that the connecting part 41 of the lower brightness enhancement film 431 is adhesively bonded to the connecting part 41 of the upper brightness enhancement film 432, and the adhesion between the upper brightness enhancement film 432 and the brightness enhancement film 433 is that the connecting part 41 of the upper brightness enhancement film 432 is adhesively bonded to the connecting part 41 of the brightness enhancement film 433, and all are adhesively bonded through double-sided tape.

[0039] Thus, the adhesion between the components of the optical component 4 and the adhesion between the optical component 4 and the die-casting part 1 are both realized through the outwardly extending connecting part 41, without affecting the optical performance of the optical component 4.

[0040] Based on the above structure, a light-shielding strip 7 is provided between the die-casting part 1 and the middle iron frame 2. The light-shielding strip 7 abuts against the side plate 12 and the ring iron frame 21, and the light-shielding strip 7 is located on the periphery of the optical component 4. The setting of the light-shielding strip 7 further avoids the occurrence of light leakage in the narrow border of the backlight module. The light-shielding strip 7 can surround the periphery of the optical component 4 or can be arranged at intervals at the parts where light leakage may occur.

[0041] In addition, a foam adhesive 6 is provided on the middle iron frame 2, and the foam adhesive 6 is arranged in a ring around the ring iron frame 21. The setting of the foam adhesive 6 facilitates the installation of the backlight module and the display screen.

[0042] The technical means disclosed by the solution of the present utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions formed by any combination of the above technical features. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present utility model.

Claims

1. A direct-type backlight module, characterized in that: include: A die casting (1) and a middle iron frame (2), wherein the middle iron frame (2) covers the die casting (1) to form a receiving cavity between the two, and a light board (3) and an optical component (4) are arranged in sequence from bottom to top in the receiving cavity; The periphery of the die casting (1) is coated with an edge glue (5), and the edge glue (5) extends upward to the periphery of the middle iron frame (2) and is bent downward to the bottom of the die casting (1).

2. The direct-type backlight module according to claim 1, characterized in that: The die casting (1) comprises a back plate (11) and a side plate (12), wherein the side plate (12) is arranged at the circumferential edge of the back plate (11) and extends toward the middle iron frame (2), and the middle iron frame (2) comprises a ring iron frame (21) and a plurality of lugs (22) arranged at intervals, wherein the plurality of lugs (22) extend from the ring iron frame (21) toward the die casting (1) and are fixedly connected to the outer wall of the side plate (12).

3. The direct-lit backlight module according to claim 2, characterized in that: The outer wall of the side plate (12) is provided with a groove (122) corresponding to the lug (22), a clamping block (121) is protruding from the groove (122), the lug (22) is provided with a clamping slot (221) corresponding to the clamping block (121), and the clamping block (121) is clamped in the corresponding clamping slot (221) so that the die casting (1) and the middle iron frame (2) are detachably connected.

4. The direct-lit backlight module according to claim 2, characterized in that: The lamp board (3) covers the back board (11); the back board (11) is provided with a limit block (111) protruding toward the lamp board (3); the lamp board (3) is provided with a corresponding limit groove (31) corresponding to the limit block (111); and the limit block (111) is clamped in the corresponding limit groove (31).

5. The direct-type backlight module according to claim 2 or 4, characterized in that: The lamp panel (3) and the back panel (11) are fixedly connected via bolts (8).

6. The direct-lit backlight module according to claim 2, characterized in that: The upper end of the side plate (12) is recessed to form a step (123), and the side of the optical component (4) extends toward the step (123) to form a connecting portion (41), and the connecting portion (41) is bonded and fixed to the step (123).

7. The direct-type backlight module according to claim 6, characterized in that: The optical component (4) comprises a diffusion plate (42) and an optical film (43) which are arranged in sequence from bottom to top, and the diffusion plate (42) and the step (123) as well as the diffusion plate (42) and the optical film (43) are both bonded and fixed.

8. The direct-lit backlight module according to claim 7, characterized in that: The optical film (43) comprises a lower brightness enhancement film (431), an upper brightness enhancement film (432) and a brightness enhancement film (433) which are arranged in sequence from bottom to top; the diffusion plate (42) and the lower brightness enhancement film (431), the lower brightness enhancement film (431) and the upper brightness enhancement film (432), and the upper brightness enhancement film (432) and the brightness enhancement film (433) are all bonded and fixed.

9. The direct-lit backlight module according to claim 2, characterized in that: The middle iron frame (2) is provided with a foam adhesive (6), and the foam adhesive (6) is arranged in a ring on the ring iron frame (21).

10. The direct-lit backlight module according to claim 2, characterized in that: A shading strip (7) is provided between the die casting (1) and the middle iron frame (2), the shading strip (7) abuts against the side plate (12) and the ring iron frame (21), and the shading strip (7) is located on the peripheral side of the optical component (4).

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