Anti-sound backlight module

Abstract

An upper iron frame and a lower iron frame which are buckled with each other are mutually encircled to form a light guide cavity, a light guide plate is assembled in the light guide cavity, and an LED light source is arranged at the bottom of the light guide plate and used for being connected with the bottom wall of the lower iron frame. The other three edges, except for the corresponding LED light sources, of the periphery of the light guide plate are provided with pad rubber strips, and the pad rubber strips abut against the side wall of the lower iron frame and are used for being in interference fit with the light guide plate. According to the anti-noise backlight module provided by the utility model, the pad rubber strip is designed on the periphery of the light guide plate, so that the pad rubber strip is in interference fit with the lower iron frame, the light guide plate is limited and fixed, the pad rubber strip can realize self extrusion and avoidance when the light guide plate expands at high temperature, and meanwhile, the pad rubber strip is made of soft plastic materials, so that the anti-noise backlight module is convenient to use. Therefore, when the pad rubber strip and the light guide plate are assembled, the problem of difficult assembly cannot be caused.

Description

Technical Field

[0001] This utility model relates to the field of automotive backlight technology, and in particular to a noise-proof backlight module. Background Technology

[0002] In automotive backlighting, due to the noise reduction requirements, all backlight materials must be designed to prevent noise. The light guide plate is a major source of noise in automotive backlighting, making its secure fixing crucial for noise prevention. A common design solution is to use double-sided adhesive for fixation to prevent noise.

[0003] As per the instruction manual Figure 6 As shown, the double-sided adhesive 1-2 on the upper and lower surfaces of the reflector 1-1 is bonded to the iron frame 1-3 on one side and to the light guide plate 1-4 on the other side, forming a whole. This bondes the three together and provides a fixing effect to prevent noise. However, for large-size (such as 12.3 inches or larger) automotive backlights, in addition to preventing noise, the high-temperature expansion of the light guide plate 1-4 must also be considered.

[0004] Because the light guide plate 1-4 expands due to heat, the outer reflector 1-1 and double-sided adhesive 1-2 are relatively thin and cannot effectively avoid deformation. This causes the light guide plate 1-4 to arch after expansion, and may even directly contact the iron frame 1-3, causing rigid contact. Therefore, a noise-proof backlight module is proposed. Utility Model Content

[0005] Therefore, it is necessary to provide a noise-proof backlight module to address the above-mentioned technical problems. The module is designed with a rubber strip around the light guide plate to form an interference fit with the lower iron frame. This not only satisfies the need to limit and fix the light guide plate, but also allows for compression avoidance when the light guide plate expands at high temperatures.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An anti-noise backlight module comprises an upper iron frame and a lower iron frame that interlock with each other. The upper iron frame and the lower iron frame together form a light guide cavity. A light guide plate is installed inside the light guide cavity. An LED light source is provided at the bottom of the light guide plate for connecting with the bottom wall of the lower iron frame. The outer three sides of the light guide plate, excluding the corresponding LED light source, are provided with rubber pads. The rubber pads abut against the side wall of the lower iron frame to form an interference fit with the light guide plate.

[0008] Furthermore, the padding strip includes a support portion and an interference fit portion;

[0009] The support part contacts the lower iron frame, the interference fit part contacts the outer side of the light guide plate, and the support part and the interference fit part are integrally connected.

[0010] Furthermore, the surface of the interference part is provided with a relief groove, and there are multiple relief grooves. The multiple relief grooves are evenly distributed along the length direction of the support part, and the interference part forms a sawtooth boss due to the action of the relief grooves.

[0011] Furthermore, the end of the interference fit away from the support has a chamfered edge, and the chamfered edge is oriented toward the reflector.

[0012] Furthermore, the rubber pad strip has three sets;

[0013] The three sets of adhesive pads are distributed on both sides and the top of the light guide plate, and there are at least two adhesive pads in each set.

[0014] Furthermore, the padding strip is made of soft plastic material.

[0015] Furthermore, the length of the serrated boss is at least one millimeter.

[0016] Furthermore, the height of the serrated boss is at least 0.5 millimeters.

[0017] Furthermore, the entire surface of the upper iron frame is provided with a rubber frame for assembling the liquid crystal display components.

[0018] Furthermore, the reflective sheet is disposed on the back of the light guide plate for contact with the lower iron frame, and an optical film is also disposed on the front of the light guide plate.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The noise-proof backlight module provided by this utility model has a rubber pad design on the periphery of the light guide plate, which forms an interference fit with the lower iron frame. This satisfies the limiting and fixing of the light guide plate, and at the same time, the rubber pad can deform and avoid the light guide plate when it expands at high temperature, thereby avoiding the problem of the expanded light guide plate being rigidly squeezed and causing arching and abnormal noise.

[0021] Meanwhile, since the padding strip is made of soft plastic, it does not cause assembly problems when assembling the padding strip with the light guide plate. In addition, the beveled design can also form a guiding effect between the padding strip and the lower iron frame when assembling, which is more conducive to its own embedded assembly.

[0022] By designing the pad strip into a serrated structure, with clearance grooves between the serrated protrusions, the pad strip can have better clearance space when the light guide plate expands and is squeezed, further reducing the problem of the light guide plate or pad strip arching. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of the noise-proof backlight module provided by this utility model;

[0024] Figure 2 A partial structural schematic diagram of the noise-reducing backlight module provided by this utility model;

[0025] Figure 3 A schematic diagram of the planar structure of the noise-reducing backlight module provided by this utility model;

[0026] Figure 4 A schematic diagram of the foot strip structure for the noise-reducing backlight module provided by this utility model;

[0027] Figure 5 A schematic diagram of the clearance groove structure of the noise-reducing backlight module provided by this utility model;

[0028] Figure 6 A schematic diagram of the structure of a conventional backlight module is provided for this utility model.

[0029] The markings in the diagram are explained as follows:

[0030] 1. Upper iron frame, 11. Light guide cavity, 12. Light guide plate, 13. LED light source, 14. Reflective sheet, 15. Optical film, 16. Adhesive frame;

[0031] Lower iron frame 2;

[0032] 3. Rubber pad strip; 31. Support part; 32. Interference fit part;

[0033] 320 clearance groove, 321 beveled chamfer, 322 serrated boss. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0035] As described in the background art, as per the appendix to the specification. Figure 6 As shown, the double-sided adhesive 1-2 on the upper and lower surfaces of the reflector 1-1 is bonded to the iron frame 1-3 on one side and to the light guide plate 1-4 on the other side, forming a whole. This bondes the three together and provides a fixing effect to prevent noise. However, for large-size (such as 12.3 inches or larger) automotive backlights, in addition to preventing noise, the high-temperature expansion of the light guide plate 1-4 must also be considered.

[0036] To solve this technical problem, this utility model provides a noise-proof backlight module, which is applied to vehicle backlighting.

[0037] For details, please refer to Figures 1-6 The noise-proof backlight module specifically includes an upper iron frame 1 and a lower iron frame 2 that interlock with each other. The upper iron frame 1 and the lower iron frame 2 together form a light guide cavity 11. A light guide plate 12 is installed inside the light guide cavity 11. An LED light source 13 is provided at the bottom of the light guide plate 12 for connecting with the bottom wall of the lower iron frame 2. The outer three sides of the light guide plate 12, except for the corresponding LED light source 13, are provided with rubber pads 3. The rubber pads 3 abut against the side wall of the lower iron frame 2 to form an interference fit with the light guide plate 12.

[0038] The noise-proof backlight module provided by this utility model has a rubber pad 3 designed around the light guide plate 12, which forms an interference fit with the lower iron frame 2. This satisfies the limiting and fixing of the light guide plate 12, and at the same time, the rubber pad 3 can achieve its own compression and avoidance when the light guide plate 12 expands at high temperature, thereby avoiding the problem of the expanded light guide plate 12 being subjected to rigid compression and causing arching and abnormal noise.

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0040] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] Example 1

[0043] Please refer to Figures 1-5 An anti-noise backlight module includes an upper iron frame 1 and a lower iron frame 2 that are interlocked. The upper iron frame 1 and the lower iron frame 2 together form a light guide cavity 11. A light guide plate 12 is installed inside the light guide cavity 11. An LED light source 13 is provided at the bottom of the light guide plate 12 for connecting with the bottom wall of the lower iron frame 2. The outer three sides of the light guide plate 12, except for the corresponding LED light source 13, are provided with padding strips 3. The padding strips 3 abut against the side wall of the lower iron frame 2 to form an interference fit with the light guide plate 12.

[0044] The padding strip 3 includes a support part 31 and an interference part 32, wherein the support part 31 contacts the lower iron frame 2, the interference part 32 contacts the outer side of the light guide plate 12, and the support part 31 and the interference part 32 are integrally connected.

[0045] like Figure 4 As shown, the padding strip 3 in this embodiment has a certain height. Therefore, after it is placed in the light guide cavity 11 and forms a contact fit with the light guide plate 12, there is a certain gap between the outer periphery of the light guide plate 12 and the lower iron frame 2. In this way, after the light guide plate 12 is expanded, the expanded light guide plate 12 will not directly contact the surface of the lower iron frame 2 and cause a hard collision problem.

[0046] Meanwhile, since the padding strip 3 is made of soft plastic, it will deform under the pressure of the light guide plate 12, thus avoiding a hard collision with the light guide plate 12 and preventing the light guide plate 12 from bending and arching due to rigid pressure.

[0047] Example 2

[0048] The noise-reducing backlight module provided in Embodiment 1 has been further optimized, specifically, as follows: Figure 4 As shown, the surface of the interference portion 32 is provided with a relief groove 320. There are multiple relief grooves 320, and the multiple relief grooves 320 are evenly distributed along the length direction of the support portion 31. The relief grooves 320 cause the interference portion 32 to form a serrated boss 322.

[0049] In practical applications, such as Figure 4 The height of the padding strip 3 shown is slightly greater than the gap between the outer periphery of the light guide plate 12 and the lower iron frame 2. After the padding strip 3 is placed in the light guide cavity 11 to fix the light guide plate 12, an interference fit can be formed between the padding strip 3 and the light guide plate 12. Through the interference fit, the stability of the light guide plate 12 after assembly is ensured, and the problem of shaking and abnormal noise is avoided.

[0050] Meanwhile, due to the design of the clearance groove 32, the pad strip 3 has more clearance space during the deformation process after being squeezed by the expansion of the light guide plate 12, so as to meet its own deformation. This can better achieve clearance for the light guide plate 12, and at the same time, ensure its own stable supporting role for the light guide plate 12.

[0051] Example 3

[0052] The noise-reducing backlight module provided in Embodiment 1 or 2 is further optimized, such as... Figure 4As shown, the end of the interference fit 32 away from the support 31 has a chamfered edge 321, and the chamfered edge 321 is arranged in the direction of the reflector 14;

[0053] With the design of the chamfer 321, after the light guide plate 12 and the pad strip 3 are assembled, the chamfer 321 on the pad strip 3 can contact the outer side of the light guide plate 12, which can form a guide and avoidance for the pad strip 3. In addition, the pad strip 3 itself is made of soft plastic material, so it will not cause assembly difficulties.

[0054] like Figure 3 As shown, the padding strip 3 has three sets, wherein the three sets of padding strip 3 are respectively distributed on both sides and the top of the light guide plate 12. The number of padding strip 3 in each set is at least two, and the number of padding strip 3 in each set can also be three or more. The specific number can be selected according to the actual application. This embodiment does not impose a unique limitation.

[0055] By simultaneously setting the padding strips 3 in multiple directions, the light guide plate 12 can be supported at multiple locations. In this way, the interference fit between the multiple padding strips 3 and the light guide plate 12 can effectively improve the fixing effect of the light guide plate 12 after fixing and avoid the problem of shaking and abnormal noise.

[0056] The padding strip 3 is made of soft plastic.

[0057] As a further optimization within this embodiment: such as Figure 5 As shown, the length of the serrated boss 322 is at least one millimeter, and the height of the serrated boss 322 is at least 0.5 millimeters;

[0058] The actual size of the aforementioned serrated boss 322 can be adaptively adjusted according to the actual size of the padding strip 3 and the application scenario to meet the application in different scenarios. This application does not impose a unique limitation.

[0059] Example 4

[0060] The noise-reducing backlight module provided in Embodiment 3 has been further optimized, such as... Figure 2 The upper iron frame 1 shown is provided with a plastic frame 16 on its entire surface for assembling the liquid crystal display component;

[0061] The reflective sheet 14 is disposed on the back of the light guide plate 12 for contacting the lower iron frame 2, and an optical film 15 is also disposed on the front of the light guide plate 12.

[0062] The process of using the noise-proof backlight module provided by this utility model is as follows: In actual application, the light guide plate 12 is first placed into the light guide cavity 11 for assembly, and then multiple pads 3 are assembled on the top and sides of the light guide plate 12 in sequence. During the assembly process, the chamfered edge 321 on the pad 3 will contact the edge of the light guide plate 12. In this way, when the pad 3 is pushed in, the chamfered edge 321 can form a clearance with the light guide plate 12. At the same time, combined with the soft plastic material characteristics of the pad 3 itself, it can be easily and completely placed into the light guide cavity 11.

[0063] After being inserted into the light guide cavity 11, one end of the padding strip 3 abuts against the inner wall of the lower iron frame 2, and the other end abuts against the light guide plate 12. After being assembled, the padding strip 3 and the light guide plate 12 are in an interference fit. In this way, when the light guide plate 12 itself is heated and expands, the padding strip 3 in contact with the light guide plate 12 can deform itself to avoid the expanded light guide plate 12. This can avoid rigid contact between the light guide plate 12 and the padding strip 3, which would cause the light guide plate 12 to bend and arch, affecting its use and causing abnormal noise.

[0064] 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A noise-proof backlight module, comprising an upper iron frame (1) and a lower iron frame (2) that interlock, wherein the upper iron frame (1) and the lower iron frame (2) together form a light guide cavity (11), and a light guide plate (12) is assembled inside the light guide cavity (11), characterized in that, The bottom of the light guide plate (12) is provided with an LED light source (13) for connecting with the bottom wall of the lower iron frame (2). The outer three sides of the light guide plate (12) except for the corresponding LED light source (13) are provided with padding strips (3). The padding strips (3) abut against the side wall of the lower iron frame (2) to form an interference fit with the light guide plate (12).

2. The noise-reducing backlight module according to claim 1, characterized in that, The padding strip (3) includes a support part (31) and an interference part (32); The support part (31) is in contact with the lower iron frame (2), the interference part (32) is in contact with the periphery of the light guide plate (12), and the support part (31) and the interference part (32) are integrally connected.

3. The noise-reducing backlight module according to claim 2, characterized in that, The surface of the interference part (32) is provided with a relief groove (320). There are multiple relief grooves (320), and the multiple relief grooves (320) are evenly distributed along the length direction of the support part (31). The relief grooves (320) cause the interference part (32) to form a serrated boss (322).

4. The noise-reducing backlight module according to claim 2, characterized in that, The interference portion (32) has a chamfered edge (321) at one end away from the support portion (31), and the chamfered edge (321) is arranged in the direction of the reflector (14).

5. The noise-reducing backlight module according to claim 1, characterized in that, The padding strip (3) has three sets; Among them, the three sets of padding strips (3) are respectively distributed on both sides and top of the light guide plate (12), and the number of padding strips (3) in each set is at least two.

6. The noise-reducing backlight module according to claim 5, characterized in that, The padding strip (3) is made of soft plastic.

7. The noise-reducing backlight module according to claim 3, characterized in that, The length of the serrated boss (322) is at least one millimeter.

8. The noise-reducing backlight module according to claim 3, characterized in that, The height of the serrated boss (322) is at least 0.5 mm.

9. The noise-reducing backlight module according to claim 1, characterized in that, The entire surface of the upper iron frame (1) is provided with a plastic frame (16) for assembling the liquid crystal display components.

10. The noise-reducing backlight module according to claim 4, characterized in that, The reflective sheet (14) is located on the back of the light guide plate (12) for contact with the lower iron frame (2), and an optical film (15) is also provided on the front of the light guide plate (12).

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