Backlight module and display device

Abstract

The utility model discloses a backlight module and a display device, the backlight module comprises a die casting, a plastic iron frame, a light bar and an optical assembly, the plastic iron frame covers the die casting so as to form a containing cavity between the plastic iron frame and the die casting, the optical assembly is flatly laid in the containing cavity, and the upper end face and the lower end face of the optical assembly abut against the die casting and the plastic iron frame respectively. The light bar is fixed to the inner side wall of the die casting and located on the side portion of the optical assembly. The rubber iron frame comprises a middle iron frame and a heat insulation rubber layer, the middle iron frame covers the die casting so that a containing cavity can be formed between the middle iron frame and the die casting, the heat insulation rubber layer is arranged between the middle iron frame and the die casting, and the heat insulation rubber layer and the middle iron frame are of an integrated structure. According to the display device, the heat insulation glue layer is arranged between the middle iron frame and the die casting, heat transfer between the middle iron frame and the die casting is slowed down through the heat insulation glue layer, when the display device is used, after heat generated by lighting of the light bar is transferred to the die casting, the transfer speed of the heat to the middle iron frame is greatly reduced, the temperature rise speed of the display module is greatly reduced, and the service life of the display module is prolonged. And the user experience is good.

Description

Technical Field

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

[0002] Backlight modules for automotive LCDs come in two types: edge-lit and direct-lit. The edge-lit backlight module consists of a die-casting, a central iron frame, and a light bar. The light bar is mounted on the inner wall of the die-casting, and the central iron frame is assembled upside down with the die-casting. The LCD screen is mounted on the central iron frame. When the LCD is in use, the heat generated by the light bar is rapidly transferred through the die-casting to the central iron frame, and then to the display screen. This causes the display screen to heat up rapidly, affecting the user experience. Utility Model Content

[0003] In order to overcome at least one of the defects described in the above-mentioned prior art, the present invention provides a backlight module and a display device to reduce the heat transfer speed when the light bar is lit, thereby greatly slowing down the heating rate of the display module and improving the user experience.

[0004] The technical solution adopted by the present invention to solve the problem is:

[0005] A backlight module comprises: a die-casting, a plastic iron frame, a light bar, and an optical assembly. The plastic iron frame covers the die-casting to form a receiving cavity between the two. The optical assembly is flatly arranged in the receiving cavity, with the upper and lower end surfaces of the optical assembly respectively abutting the die-casting and the plastic iron frame. The light bar is fixed to the inner side wall of the die-casting and is located on the side of the optical assembly.

[0006] The glue iron frame includes a middle iron frame and a heat insulating glue layer. The middle iron frame is covered on the die casting to form a accommodating cavity between the two. The heat insulating glue layer is arranged between the middle iron frame and the die casting, and the heat insulating glue layer and the middle iron frame are an integrated structure.

[0007] Furthermore, the die casting comprises a back plate and side plates, the side plates being arranged at the circumferential edge of the back plate and extending toward the middle iron frame, and the light bar being fixed to the inner wall of the side plates;

[0008] The middle iron frame includes a ring iron frame and several lugs arranged at intervals. The several lugs extend from the ring iron frame toward the die-casting and are fixedly connected to the outer walls of the side panels. The thermal insulation rubber layer is arranged between the ring iron frame and the side panels. The upper and lower end surfaces of the optical component respectively abut the back panel and the ring iron frame.

[0009] Furthermore, a number of blocks are protruded at intervals on the outer wall of the side panel, and a number of lugs are provided with slots. The number of slots is equal to the number of blocks, and the positions of the slots correspond one-to-one to the positions of the blocks. The blocks are mounted in the corresponding slots so that the die-cast part and the rubber iron frame can be detachably connected.

[0010] Furthermore, the backlight module is provided with edge glue around its periphery. The edge glue covers the outer wall of the side plate, extends upward to the outer wall of the ring iron frame, and bends downward to the bottom of the back plate.

[0011] Furthermore, the optical component includes a reflective film, a light guide plate and an optical film arranged in sequence from bottom to top. The reflective film and the back plate, the reflective film and the light guide plate, and the light guide plate and the optical film are all bonded and fixed, and the optical film abuts the ring iron frame.

[0012] Furthermore, a limiting post is convexly provided on the light guide plate, and the optical film is provided with a clamping ear, which is arranged corresponding to the limiting post, and the clamping ear is sleeved on the limiting post.

[0013] Furthermore, the optical film includes a diffusion film, a lower light enhancement film, an upper light enhancement film and a brightness enhancement film bonded together from bottom to top. The diffusion film, the lower light enhancement film, the upper light enhancement film and the brightness enhancement film are all provided with ears corresponding to the limit columns, and the brightness enhancement film abuts the ring iron frame.

[0014] Furthermore, the side panel includes a first side panel and a second side panel, the light bar is installed on the inner wall of the first side panel, and the inner wall of the second side panel is installed with a side reflection film.

[0015] The utility model also provides a display device, comprising: a display module and a backlight module.

[0016] Furthermore, the display module is mounted on the backlight module through foam glue.

[0017] The beneficial effects of the backlight module and display device provided by the present invention are as follows:

[0018] By setting a thermal insulation rubber layer between the middle iron frame and the die-casting, the heat transfer between the middle iron frame and the die-casting is slowed down through the thermal insulation rubber layer. When the display device is in use, the heat generated by the light bar is transferred to the die-casting, and its transfer speed to the middle iron frame is greatly reduced, thereby greatly reducing the heating rate of the display module and providing a good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a display device of the present invention;

[0020] Figure 2 This is a schematic structural diagram of the backlight module of the present utility model;

[0021] Figure 3 This is an exploded view of the backlight module of the present utility model;

[0022] Figure 4 This is a schematic structural diagram of the die-casting, iron frame and edging glue of the present invention;

[0023] Figure 5This is an exploded view of the optical component of the present invention.

[0024] The meanings of the reference numerals are as follows:

[0025] 1. Die-casting; 11. Back panel; 12. Side panel; 121. Clamp; 2. Glue iron frame; 21. Ring iron frame; 22. Lug; 221. Slot; 3. Light bar; 4. Optical component; 41. Reflective film; 42. Light guide plate; 421. Limiting column; 43. Optical film; 431. Lug; 432. Diffusion film; 433. Lower brightening film; 434. Upper brightening film; 435. Brightening film; 44. Side reflective film; 5. Edge tape; 6. Double-sided tape; 7. Foam glue; 10. Backlight module; 20. Display module. DETAILED DESCRIPTION

[0026] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] Example 1

[0030] See Figure 2 and Figure 3 This embodiment discloses a backlight module comprising: a die-casting 1, a plastic iron frame 2, a light bar 3, and an optical assembly 4. The plastic iron frame 2 covers the die-casting 1 to form a receiving cavity between the two. The optical assembly 4 is flatly arranged in the receiving cavity, with the upper and lower end surfaces of the optical assembly 4 respectively abutting the die-casting 1 and the plastic iron frame 2. The light bar 3 is fixed to the inner side wall of the die-casting 1 and located to the side of the optical assembly 4. The plastic iron frame 2 includes a middle iron frame and a thermal insulation layer. The middle iron frame covers the die-casting 1 to form a receiving cavity between the two. The thermal insulation layer is provided between the middle iron frame and the die-casting 1, and the thermal insulation layer and the middle iron frame are an integral structure.

[0031] Therefore, the backlight module sets a thermal insulation rubber layer between the middle iron frame and the die-casting 1 to slow down the heat transfer between the middle iron frame and the die-casting 1 through the thermal insulation rubber layer. When the display device is in use, after the heat generated by the light bar 3 is lit and transferred to the die-casting 1, its transfer speed to the middle iron frame is greatly reduced, thereby greatly reducing the heating rate of the display module 20, and the user experience is good.

[0032] See Figure 4 The die-casting 1 includes a back plate 11 and side plates 12. The side plates 12 are located at the circumferential edge of the back plate 11 and extend toward the center iron frame. The light bar 3 is fixed to the inner wall of the side plate 12. The die-casting 1 has an upward-opening cavity structure. The light bar 3 and optical assembly 4 are both installed in the cavity. The light bar 3 is bonded to the inner wall of the side plate 12 with double-sided tape 6.

[0033] The middle iron frame includes a ring iron frame 21 and a number of lugs 22 arranged at intervals. The 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 panel 12. A thermal insulation layer is provided between the ring iron frame 21 and the side panel 12. The upper and lower end surfaces of the optical component 4 abut the back panel 11 and the ring iron frame 21, respectively. The thermal insulation layer, the ring iron frame 21, and the lugs 22 are an integrated structure. The thermal insulation layer is provided at the bottom of the ring iron frame 21, and the bottom surface of the thermal insulation layer abuts the top surface of the side panel 12. The ring iron frame 21 and the side panel 12 are isolated by the thermal insulation layer, thereby slowing down the transfer of heat generated when the light bar 3 is lit from the side panel 12 to the ring iron frame 21.

[0034] The lugs 22 can be connected to the side panels 12 by welding, but this is difficult to disassemble, making it inconvenient to replace the internal light board 3 and optical assembly 4. To this end, a number of blocks 121 are protruded from the outer wall of the side panels 12 at intervals. Each of the lugs 22 has a slot 221. The number of slots 221 is equal to the number of blocks 121, and the positions of the slots 221 correspond to the positions of the blocks 121. The blocks 121 are locked into the corresponding slots 221, allowing for a detachable connection between the die-casting 1 and the plastic iron frame 2. The engagement of the blocks 121 with the slots 221 ensures a stable connection between the die-casting 1 and the plastic iron frame 2, while also allowing for detachable replacement of the internal light board 3 and optical assembly 4.

[0035] The backlight module is surrounded by adhesive tape 5, which wraps around the outer walls of the side panels 12. The adhesive tape 5 extends upward to the outer walls of the iron ring frame 21 and bends downward to the bottom of the back panel 11. The adhesive tape 5 prevents light leakage from the sides of the backlight module and prevents impurities from entering the interior of the backlight module. The adhesive tape 5 can completely wrap around the backlight module or be spaced apart in locations prone to light leakage and / or impurities.

[0036] Based on the above structure, see Figure 3 and Figure 5The optical assembly 4 includes a reflective film 41, a light guide plate 42, and an optical film 43, which are arranged in order from bottom to top. The reflective film 41 and the back plate 11, the reflective film 41 and the light guide plate 42, and the light guide plate 42 and the optical film 43 are all bonded and fixed by double-sided tape 6. The optical film 43 abuts the ring iron frame 21. Therefore, the double-sided tape 6 and the abutment arrangement ensure that the optical assembly 4 is stably installed.

[0037] Furthermore, a stopper post 421 is protruding from the light guide plate 42, and a latch 431 is provided on the optical film 43. The latch 431 is arranged corresponding to the stopper post 421 and is sleeved on the stopper post 421. Based on the bonding of the double-sided tape 6, the stopper arrangement of the latch 431 and the stopper post 421 further improves the installation stability of the optical film 43 and the light guide plate 42, thereby improving the light output effect of the backlight module.

[0038] Specifically, the optical film 43 includes a diffusion film 432, a lower light-enhancing film 433, an upper light-enhancing film 434 and a brightness-enhancing film 435, which are bonded from bottom to top in sequence by double-sided tape 6. The diffusion film 432, the lower light-enhancing film 433, the upper light-enhancing film 434 and the brightness-enhancing film 435 are all provided with ears 431 corresponding to the limiting columns 421, and the brightness-enhancing film 435 abuts against the ring iron frame 21.

[0039] It should be noted that the reflective film 41, light guide plate 42, diffusion film 432, lower light enhancement film 433, upper light enhancement film 434 and brightness enhancement film 435 are all laid out in sequence from bottom to top to ensure the light output effect and installation stability of the backlight module.

[0040] In addition, the light bar 3 is bonded to the inner wall of the side panel 12 using double-sided tape 6, but is not bonded to the entire inner wall of the side panel 12. The side panel 21 includes a first side panel and a second side panel. The light bar 3 is mounted on the inner wall of the first side panel, and a side reflective film 44 is mounted on the inner wall of the second side panel. The side reflective film 44 combines with the reflective film 41 to reflect light emitted by the light bar 3 to the light guide plate 42.

[0041] Example 2

[0042] This embodiment provides a display device, including: a display module 20 and the backlight module 10 disclosed in Embodiment 1. The display module 20 is mounted on the backlight module 10 via foam adhesive 7 .

[0043] The foam adhesive 7 is disposed on the adhesive iron frame 2 , specifically on the upper surface of the ring iron frame 21 , so as to attach the display module 20 to the backlight module 10 through the foam adhesive 7 .

[0044] The display device provides a heat-insulating adhesive layer between the ring iron frame 21 and the side panel 12 to slow down the heat transfer between the ring iron frame 21 and the side panel 12. When the display device is in use, after the heat generated by the light bar 3 is transferred to the side panel 12, the speed of its transfer to the ring iron frame 21 is greatly reduced, thereby greatly reducing the heating rate of the display module 20, and the user experience is good.

[0045] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A backlight module, characterized in that: include: A die-casting (1), a plastic iron frame (2), a light bar (3) and an optical component (4), wherein the plastic iron frame (2) covers the die-casting (1) to form a receiving cavity between the two, the optical component (4) is laid flat in the receiving cavity, and the upper and lower end surfaces of the optical component (4) respectively abut the die-casting (1) and the plastic iron frame (2), and the light bar (3) is fixed to the inner side wall of the die-casting (1) and is located on the side of the optical component (4); The glue iron frame (2) comprises a middle iron frame and a heat-insulating glue layer, the middle iron frame covers the die-casting (1) to form the accommodating cavity between the two, the heat-insulating glue layer is arranged between the middle iron frame and the die-casting (1), and the heat-insulating glue layer and the middle iron frame are an integrated structure.

2. The backlight module according to claim 1, wherein: The die casting (1) comprises a back plate (11) and a side plate (12), wherein the side plate (12) is arranged on the circumferential edge of the back plate (11) and extends toward the middle iron frame, and the light bar (3) is fixed to the inner wall of the side plate (12); The middle iron frame 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), the heat-insulating adhesive layer is arranged between the ring iron frame (21) and the side plate (12), and the upper and lower end surfaces of the optical component (4) respectively abut against the back plate (11) and the ring iron frame (21).

3. The backlight module according to claim 2, wherein: The outer wall of the side plate (12) is provided with a plurality of blocks (121) at intervals, and a plurality of the lugs (22) are provided with a card slot (221), the number of the card slots (221) is equal to the number of the card blocks (121), and the positions of the card slots (221) correspond to the positions of the card blocks (121) in a one-to-one manner, and the card blocks (121) are fixed in the corresponding card slots (221) so that the die-casting part (1) and the rubber iron frame (2) are detachably connected.

4. The backlight module according to claim 2, wherein: The circumferential side of the backlight module is provided with an edge glue (5), the edge glue (5) is coated on the outer wall of the side plate (12), and the edge glue (5) extends upward to the outer side wall of the ring iron frame (21) and is bent downward to the bottom of the back plate (11).

5. The backlight module according to claim 2, wherein: The optical component (4) comprises a reflective film (41), a light guide plate (42) and an optical film (43) arranged in sequence from bottom to top; the reflective film (41) and the back plate (11), the reflective film (41) and the light guide plate (42), and the light guide plate (42) and the optical film (43) are all bonded and fixed; the optical film (43) abuts against the ring iron frame (21).

6. The backlight module according to claim 5, wherein: A limiting post (421) is convexly provided on the light guide plate (42), and a clamping ear (431) is provided on the optical film (43). The clamping ear (431) is arranged corresponding to the limiting post (421), and the clamping ear (431) is sleeved on the limiting post (421).

7. The backlight module according to claim 6, wherein: The optical film (43) comprises a diffusion film (432), a lower brightness enhancement film (433), an upper brightness enhancement film (434) and a brightness enhancement film (435) which are sequentially bonded from bottom to top; the diffusion film (432), the lower brightness enhancement film (433), the upper brightness enhancement film (434) and the brightness enhancement film (435) are all provided with the lugs (431) corresponding to the limiting posts (421); and the brightness enhancement film (435) abuts against the ring iron frame (21).

8. The backlight module according to claim 2, wherein: The side panel (12) comprises a first side panel and a second side panel, the light bar (3) is mounted on the inner wall of the first side panel, and a side reflection film (44) is mounted on the inner wall of the second side panel.

9. A display device, characterized in that: include: A display module (20) and a backlight module (10) as claimed in any one of claims 1 to 8.

10. The display device according to claim 9, wherein: The display module (20) is mounted on the backlight module (10) via foam glue (7).

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