Backlight module and display device

Abstract

The application provides a backlight module and a display device, which comprise a middle sheet metal and a bottom sheet metal, one or more protruding parts are arranged at a position close to a second side wall of the middle sheet metal on a first side wall of the bottom sheet metal, the length of the part of the protruding part beyond the first side wall is less than the distance between the first side wall and the second side wall, the protruding part reduces the movable gap between the middle sheet metal and the side wall of the bottom sheet metal, and reduces the friction displacement between the middle sheet metal and the bottom sheet metal. In addition, since the relative friction coefficient between the protruding part and the middle sheet metal is less than or equal to 0.6, the protruding part and the middle sheet metal are not prone to friction, thereby solving the problems of abrasion and generation of abrasive powder between the middle sheet metal and the bottom sheet metal in the backlight module.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a backlight module and a display device. Background Technology

[0002] Mini-LEDs have been widely used in direct-lit backlighting technology in recent years, enabling LCD panels to achieve thinner, lighter, higher-quality, and lower-power consumption. Their performance is close to that of OLEDs, and they outperform OLEDs in brightness and color rendering. Furthermore, Mini-LED backlighting can be combined with precise local dimming technology to control the switching and brightness adjustment of corresponding backlight areas in real time, resulting in high contrast, more vibrant colors, and a high dynamic range (HDR) screen effect.

[0003] Mini-LED technology plays a crucial role in achieving high dynamic range displays. However, during vibration testing, the middle and bottom sheet metal of the backlight module are prone to wear, indicating room for improvement in both manufacturing processes and design. Structurally, a backlight module typically comprises a space formed by a bottom sheet metal and a middle sheet metal. This space houses components such as the light source, reflector, light guide plate, and optical films. The bottom and middle sheet metals are located at the bottom and top of the backlight module, respectively. The top plate of the middle sheet metal has a viewing window through which light emitted from the light source enters the display panel. For ease of assembly, the middle and bottom sheet metals are usually secured with clips and tape. Due to the assembly gap between the side walls of the middle and bottom sheet metals, relative movement and friction are inevitable during vibration. This friction generates dust, which can enter the display area of ​​the backlight, blocking light and causing optical defects, thus affecting the brightness of the backlight and the display effect of the device. Summary of the Invention

[0004] In view of this, the present invention provides a backlight module and its display device to solve the problem of friction and powdering caused by relative movement between the middle sheet metal and the bottom sheet metal during vibration.

[0005] This invention provides a backlight module, including a middle sheet metal and a bottom sheet metal. The bottom sheet metal includes a bottom plate and a first sidewall. The middle sheet metal includes a windowed top plate and a second sidewall. The windowed top plate and the bottom plate are arranged opposite to each other. The middle sheet metal is arranged above the bottom sheet metal, and the two form a receiving cavity. The second sidewall is arranged outside the first sidewall. One or more protruding parts are provided on the first sidewall near the second sidewall. The relative friction coefficient between the protruding parts and the middle sheet metal is less than or equal to 0.6. The length of the part of the protruding part that extends beyond the first sidewall is less than the distance between the first sidewall and the second sidewall.

[0006] Based on the same inventive concept, the present invention also provides a display device, including the backlight module of the present invention.

[0007] Compared with the prior art, the display module and display device provided by the present invention achieve at least the following beneficial effects:

[0008] This invention provides a backlight module comprising a middle sheet metal and a bottom sheet metal. The bottom sheet metal includes a bottom plate and a first sidewall. The middle sheet metal includes a windowed top plate and a second sidewall. The windowed top plate and the bottom plate are arranged opposite to each other, with the middle sheet metal positioned above the bottom sheet metal, forming a receiving cavity. The second sidewall is located outside the first sidewall. One or more protruding portions are provided on the first sidewall near the second sidewall. The relative friction coefficient between the protruding portions and the middle sheet metal is less than or equal to 0.6, and the length of the portion of the protruding portion extending beyond the first sidewall is less than the distance between the first and second sidewalls. The protruding portions reduce the gap between the sidewalls of the middle sheet metal and the bottom sheet metal, reducing the frictional displacement between them. Furthermore, since the relative friction coefficient between the protruding portions and the middle sheet metal is less than or equal to 0.6, friction between the protruding portions and the middle sheet metal is less likely to occur, thus solving the wear problem between the middle and bottom sheet metals in the backlight module. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the backlight module of the present invention;

[0011] Figure 2 This is a schematic diagram of the sheet metal structure of the present invention;

[0012] Figure 3 This is a schematic diagram of the sheet metal structure in this invention;

[0013] Figure 4 for Figure 2A magnified view of part A;

[0014] Figure 5 for Figure 2 A magnified view of a portion of the groove at point A;

[0015] Figure 6 for Figure 2 A magnified view of the gap at point A;

[0016] Figure 7 for Figure 2 Another enlarged view of point A;

[0017] Figure 8 for Figure 2 Another magnified view of point A;

[0018] Figure 9 for Figure 2 Another enlarged view of the groove at point A;

[0019] Figure 10 for Figure 2 Another enlarged view of the protruding part at point A;

[0020] Figure 11 This is a schematic diagram of the structure of the display device of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention. The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. As for the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and relevant parts can be referred to the method section.

[0022] Figure 1 This is a schematic diagram of the backlight module of the present invention. Figure 2 This is a diagram of the overall structure of the bottom sheet metal as shown in an embodiment of the present invention. Figure 3 This is a diagram of the overall sheet metal structure shown in an embodiment of the present invention. Figure 4 for Figure 2 A magnified view of a portion at point A. Figure 2 The overall structure of the bottom sheet metal shown consists of a bottom plate 1 and a first side wall 2. The first side wall 2 is composed of multiple interconnected first sub-side walls 21. Figure 3The overall structure of the middle sheet metal shown consists of a windowed top plate 3 and a second side wall 4. A viewing window 5 is provided on the middle sheet metal 20 to direct light emitted from the light source into the display panel. During assembly of the middle sheet metal 20 and the bottom sheet metal 10, the middle sheet metal 20 is inverted and placed above the bottom sheet metal 10. The bottom sheet metal 10 and the middle sheet metal 20 are located at the bottom and top of the backlight module, respectively. The bottom plate 1 and the windowed top plate 3 are positioned opposite each other. The second side wall 4 is located outside the first side wall 2. The accommodating space formed by the middle sheet metal 20 and the bottom sheet metal 10 is used to accommodate components such as the lamp plate 30, reflector 40, diffuser plate 50, diffuser film 60, prism film 70, and reflective polarizing brightening film 80. At least one protruding portion 6 is provided on the first sub-side wall 21. The protruding portion 6 extends beyond the first sub-side wall 21 in a second direction, which is the thickness direction of the first sub-side wall 21. The length of the portion of the protruding portion 6 extending beyond the first side wall 21 is less than the distance between the first side wall 2 and the second side wall 4. The protruding part 6 is made of anti-friction material, and the relative friction coefficient between it and the middle sheet metal 20 is less than or equal to 0.6.

[0023] In existing designs, to reduce the assembly difficulty of the bottom sheet metal 10 and the middle sheet metal 20, the gap between the side walls of the bottom sheet metal 10 and the middle sheet metal 20 is usually relatively large. This causes the middle sheet metal 20 and the bottom sheet metal 10 to easily move relative to each other and generate friction during vibration. Friction easily generates powder, which enters the display area of ​​the backlight and blocks the light, causing optical defects and affecting the brightness of the backlight and the display effect of the display device. This embodiment primarily addresses the problem of friction arising from relative movement between the middle sheet metal 20 and the bottom sheet metal 10. By providing a protruding portion 6 near the second sidewall 4 of the first sidewall 2 of the bottom sheet metal 10, the original contact between the middle sheet metal 20 and the bottom sheet metal 10 is changed to contact between the middle sheet metal 20 and the protruding portion 6. Since the relative friction coefficient between the protruding portion 6 and the middle sheet metal 20 is less than or equal to 0.6, friction between them is minimal, thus solving the problem of friction and powder generation between the middle sheet metal 20 and the bottom sheet metal 10. Furthermore, because the length of the portion of the protruding portion 6 extending beyond the first sidewall 2 is less than the distance between the first sidewall 2 and the second sidewall 4, the protruding portion 6 not only reduces the clearance between the bottom sheet metal 10 and the middle sheet metal 20, thus reducing frictional displacement, but also does not affect assembly. Therefore, during vibration, the bottom sheet metal 10 and the middle sheet metal 20 are unlikely to wobble relative to each other, preventing abnormal noise caused by a large clearance between them.

[0024] The technical solution of the present invention is to provide one or more protruding portions 6 between the first sidewall 2 and the second sidewall 4. Since the thickness of the middle sheet metal 20 is relatively thin, usually 0.4mm, if at least one protruding portion 6 is provided on the second sidewall 2, the local structure cannot be fixed, and this design will reduce the strength of the middle sheet metal 20. Considering the actual application performance and processing performance of the product, the present invention does not use at least one protruding portion 6 on the second sidewall 2, but uses a protruding portion 6 on the first sidewall 2.

[0025] Optionally, the bottom sheet metal 10 is typically made of stainless steel, while the middle sheet metal 20 is typically made of aluminum alloy. If both are made of stainless steel, the weight of the backlight module would increase, and the product's weight needs to be within a certain range during design and production. Furthermore, using stainless steel would significantly increase the product's cost. If both are made of aluminum alloy, the middle sheet metal 20, with a thickness of only 0.4mm, would not meet strength requirements and might break during transportation or use. Additionally, aluminum alloy has relatively low hardness, making it more prone to generating powder during friction between the middle sheet metal 20 and the bottom sheet metal 10. Therefore, using stainless steel for the bottom sheet metal 10 and aluminum alloy for the middle sheet metal 20 results in better product strength, allowing it to withstand drop and ball impact tests. Simultaneously, it reduces the product's weight, significantly lowering its price and making the product more economical.

[0026] Alternatively, please continue to refer to Figure 4 The height H of the protruding part 6 extends beyond the first sub-side wall 21 and approaches the top plate 3 of the window. To match the overall structural dimensions of the machine, the height of the first sub-side wall 21 of the bottom sheet metal 10 needs to be reduced. The reduction in the height of the first sub-side wall 21 is equal to the extension of the protruding part 6 beyond the first sub-side wall 21. This design changes the original contact between the first sub-side wall 21 and the top plate 3 to contact between the protruding part 6 and the top plate 3. Since the relative coefficient of friction between the protruding part 6 and the middle sheet metal is less than or equal to 0.6, the protruding part 6 and the top plate 3 are less prone to friction, thus avoiding the problem of powdering.

[0027] Optional, please continue to participate Figure 5 At least one groove 7 is provided on each first sub-sidewall 21 for providing a protruding portion 6. The shape of the protruding portion 6 on the groove 7 is the same as the shape of the groove, but the shape of the protruding portion 6 extending beyond the groove 7 is not limited.

[0028] Optional, please continue to participate Figure 4 , Figure 5 and Figure 6The length of the groove 7 along the first direction is greater than or equal to the length of the protrusion 6 along the first direction, and the length of the groove 7 along the second direction is less than or equal to the length of the first sub-sidewall 21 along the second direction. The first direction is perpendicular to the second direction, and the second direction is the thickness direction of the first sub-sidewall 21. In particular, when the length of the groove 7 along the second direction is equal to the length of the first sub-sidewall 21 along the second direction, the groove is a notch 8. The protrusion 6 is tightly embedded in the groove 7. Due to the interlocking force, the protrusion 6 is not easy to fall off during use, thus preventing the protrusion from falling off and scratching the backlight component.

[0029] Alternatively, the protruding portion 6 can be fixed to the groove 7 using an adhesive material, such as tape, glue, or other adhesive materials; this invention is not limited to these types of materials. This fixing method is not only simple to operate but also ensures excellent stability even when the display device is in motion within a vehicle.

[0030] Alternatively, the protruding part 6 and the groove 7 can also be assembled by interlocking serrations, please refer to [reference needed]. Figure 7 Sawtooth teeth are provided at both ends of the protruding part 6, and corresponding sawtooth teeth are also provided at the groove 7. The sawtooth teeth of the protruding part 6 and the sawtooth teeth of the groove 7 are interlocked. The sawtooth design increases the interaction force between the protruding part 6 and the base sheet metal 20, allowing the protruding part 6 to be better fixed to the base sheet metal 10. Even under very large vibration amplitude, the protruding part 6 can be firmly fixed to the base sheet metal 10 and will not fall off. In actual production testing, even when the vibration condition is 50 times the acceleration due to gravity, no detachment of the protruding part 6 was observed.

[0031] Alternatively, the protruding part 6 can also be set in the groove 7 by injection molding. The injection molding process not only solves the problems of long mold development cycle, high mold cost, and complicated and expensive assembly process for the protruding part 6, but also has stable dimensions and high assembly accuracy with the groove 7. In addition, compared with using adhesive materials to fix the protruding part 6 in the groove 7, the injection molding method makes the protruding part 6 more firmly fixed in the groove 7.

[0032] Furthermore, nylon possesses excellent anti-friction properties, good processing performance, is easy to injection mold, and is inexpensive. Therefore, the protruding part 6 of this invention can also use nylon as an example, injecting nylon into the corresponding groove 7, changing the contact between the middle sheet metal 20 and the bottom sheet metal 10 to the contact between the middle sheet metal 20 and the nylon component. Since the relative coefficient of friction between nylon and stainless steel is 0.3 to 0.5, it is not easy for nylon to rub against stainless steel during relative movement, thereby avoiding the generation of grinding powder.

[0033] Figure 8 for Figure 2Another magnified view of point A. Figure 9 for Figure 2 Another magnified view of the groove at point A. Figure 10 for Figure 2 Another enlarged view of the protruding part at point A. Please refer to... Figure 9 At least one groove 9 is provided on each first sub-sidewall 21, and at least one through hole or second groove 12 is provided in the groove 9. This embodiment illustrates this by providing two through holes 12 in the groove 9, but there is no limitation in actual application, and the through hole or second groove 12 can be of any shape, such as rectangular, triangular, circular or irregular shape. Please continue to refer to Figure 8 and Figure 10 Another protruding part 11 is assembled at the groove 9. A convex hull 11d is provided at the position corresponding to the through hole 12 on the third sidewall 11c of the protruding part 11. The convex hull 11d is embedded inside the through hole 12, and the size of the convex hull 11d matches the shape of the through hole 12. Moreover, the length of the convex hull 11d in the second direction does not exceed the length of the through hole 12 in the second direction. The protruding part 11 and the bottom sheet metal 10 are interference-fitted through the two through holes 12, which greatly increases the firmness and stability of the protruding part 11 in the backlight module and further prevents the protruding part 11 from falling off during vibration. In addition, this design reduces the difficulty of operation and increases the production yield and production efficiency.

[0034] Alternatively, please continue to refer to Figure 8 The protruding portion 11 extends beyond the first sub-sidewall 21 in the second direction, its length in the first direction is less than or equal to the length of the groove 9, and its height H extends beyond the first sub-sidewall 21 near the top plate 3 of the window. To match the overall structural dimensions of the device, the height of the first sub-sidewall 21 needs to be reduced, and the reduction in height of the first sub-sidewall 21 is equal to the reduction in the length of the protruding portion 9 extending beyond the first sub-sidewall 21. Since the protruding portion 11 extends beyond the first sub-sidewall 21 in both the second direction and the height H direction, the original contact between the middle sheet metal 20 and the bottom sheet metal 10 is changed to contact between the middle sheet metal 20 and the protruding portion 11. In addition, the movement gap between the middle sheet metal and the bottom sheet metal is reduced, and the frictional displacement between them is reduced, thereby solving the problem of frictional powdering between the middle sheet metal and the bottom sheet metal in the backlight module.

[0035] Furthermore, the protruding part 11 can also be made of a material with a hardness difference of less than or equal to 30 HBW between it and the middle sheet metal 20. When the hardness difference between the protruding part 11 and the middle sheet metal 20 is less than or equal to 30 HBW, they are less likely to generate grinding powder, thus solving the problem of grinding powder generated when the bottom sheet metal 10 and the middle sheet metal 20 come into contact and undergo relative movement. Since the middle sheet metal 10 is usually made of stainless steel, this embodiment can also use locally available materials, with the protruding part 11 made of stainless steel.

[0036] For further information, please continue to refer to [link / reference]. Figure 10 The protruding portion 11 also includes a first top 11a, a third sidewall 11c, a connecting portion 11b, and a protrusion 11d. The connecting portion 11b, the first top 11a away from the connecting portion 11b, and both ends of the third sidewall 11c along the first direction are chamfered. When the protruding portion 11 is made of a material with a hardness difference of less than or equal to 30 HBW with the middle sheet metal 20, this prevents the sharp edges of the protruding portion 11 from scratching the middle sheet metal 20, and also prevents scratching operators during module assembly. The protruding portion 11 not only has an interference fit with the bottom sheet metal 10 through two through holes 12, but also firmly hangs the first top 11a on the first sub-sidewall 21, thereby limiting the relative displacement between the protruding portion 11 and the bottom sheet metal 10. Furthermore, this semi-enclosed design allows the display device to withstand extreme conditions.

[0037] Furthermore, the first sidewall 2 includes a plurality of interconnected first sub-sidewalls 21, and each first sub-sidewall 21 includes at least one protruding portion, so that the first sidewall 2 will not have friction and grinding problems with the second sidewall 4 and the window top plate 3.

[0038] This application further addresses the problem of grinding caused by the difference in material hardness between the middle sheet metal 20 and the bottom sheet metal 10. By providing a protruding portion 11 on the first sub-sidewall 21 with a hardness difference of less than 30 HBW between the middle sheet metal 20 and the bottom sheet metal 10, and by changing the contact between the middle sheet metal 20 and the bottom sheet metal 10 to contact between the middle sheet metal 20 and the protruding portion 11, the presence of the protruding portion 11 reduces the movement gap between the middle sheet metal 20 and the bottom sheet metal 10, thereby reducing the frictional displacement between them. Furthermore, the small hardness difference between the protruding portion 11 and the middle sheet metal 20 prevents grinding during friction. Therefore, by providing the protruding portion 11 between the bottom sheet metal 10 and the middle sheet metal 20, the problem of friction and grinding between the middle sheet metal 10 and the bottom sheet metal 20 is solved.

[0039] In summary, there are two main reasons for the grinding between the bottom and middle sheet metal: first, the middle and bottom sheet metals are prone to relative movement during vibration or motion, easily generating friction; second, the middle and bottom sheet metals are usually made of different materials—the middle sheet metal is typically stainless steel, while the bottom sheet metal is typically aluminum alloy, resulting in a significant difference in hardness, which easily leads to grinding during friction. This invention patent addresses these two problems by incorporating a protruding component with a relative friction coefficient of less than or equal to 0.6 and a hardness difference of less than 30 HBW with the middle sheet metal. This reduces the movement gap, frictional displacement, and hardness difference between the middle and bottom sheet metals, thereby solving the problem of frictional grinding between the middle and bottom sheet metals during movement or vibration.

[0040] like Figure 11As shown, this embodiment also provides a display device including the above-mentioned backlight module, and further includes a panel 90 and a cover plate 100. Similarly, since any of the above-mentioned protruding parts are provided in the bottom sheet metal 10, the problem of friction and powder generation between the sheet metal 20 and the bottom sheet metal 10 during vibration is solved, and the product yield and display quality are further improved.

[0041] As can be seen from the above embodiments, the display module and display device provided by the present invention achieve at least the following beneficial effects:

[0042] This invention provides a backlight module comprising a middle sheet metal and a bottom sheet metal. The bottom sheet metal includes a bottom plate and a first sidewall. The middle sheet metal includes a windowed top plate and a second sidewall. The windowed top plate and the bottom plate are arranged opposite to each other, with the middle sheet metal positioned above the bottom sheet metal, forming a receiving cavity. The second sidewall is located outside the first sidewall. One or more protruding portions are provided on the first sidewall near the second sidewall. The relative friction coefficient between the protruding portions and the middle sheet metal is less than or equal to 0.6. The protruding portions reduce the gap between the sidewalls of the middle sheet metal and the bottom sheet metal, reducing the frictional displacement between them. Furthermore, since the relative friction coefficient between the protruding portions and the middle sheet metal is less than or equal to 0.6, friction between the protruding portions and the middle sheet metal is less likely to occur, thus solving the wear problem between the middle and bottom sheet metals in the backlight module.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A backlight module, comprising a middle sheet metal and a bottom sheet metal, the bottom sheet metal comprising a bottom plate and a first sidewall, the middle sheet metal comprising a windowed top plate and a second sidewall, the windowed top plate being disposed opposite to the bottom plate, the middle sheet metal being disposed above the bottom sheet metal to form a receiving cavity, and the second sidewall being disposed outside the first sidewall, characterized in that, One or more protruding portions are provided on the first sidewall near the second sidewall, the relative friction coefficient between the protruding portions and the sheet metal is less than or equal to 0.6, and the length of the portion of the protruding portions extending beyond the first sidewall is less than the distance between the first sidewall and the second sidewall; A groove is provided on the first sidewall corresponding to the protruding portion; The length of the groove along the first direction is greater than or equal to the length of the protrusion along the first direction, and the length of the groove along the second direction is less than or equal to the length of the first sidewall along the second direction. The first direction is perpendicular to the second direction, and the second direction is the thickness direction of the first sidewall.

2. The backlight module according to claim 1, characterized in that, The sheet metal in the middle is made of a different material than the sheet metal at the bottom.

3. The backlight module according to claim 1, characterized in that, The protruding portion extends beyond the first sidewall and is close to the top plate of the window opening.

4. The backlight module according to claim 1, characterized in that, Both the protruding portion and the groove include serrations, and the serrations of the protruding portion and the groove mesh with each other.

5. The backlight module according to claim 1, characterized in that, The protruding portion is fixed to the first sidewall by an adhesive material.

6. The backlight module according to claim 1, characterized in that, The protruding portion is fixed to the first sidewall by injection molding.

7. The backlight module according to claim 1, characterized in that, The hardness difference between the protruding part and the sheet metal is less than or equal to 30 HBW.

8. The backlight module according to claim 1, characterized in that, One or more second grooves are provided at the groove, and a protrusion is provided at the position corresponding to the second groove on the protruding part, the protrusion being embedded inside the second groove.

9. The backlight module according to claim 1, characterized in that, One or more through holes are provided in the groove, and a protrusion is provided at the position corresponding to the through hole on the protruding part, the protrusion being embedded inside the through hole.

10. The backlight module according to claim 1, characterized in that, The protruding portion includes a first top, a third sidewall, and a connecting portion, and both the connecting portion and the first top are chamfered away from the connecting portion.

11. The backlight module according to claim 1, characterized in that, The first sidewall includes a plurality of interconnected first sub-sidewalls, each of the first sub-sidewalls including at least one of the protruding portions.

12. The backlight module according to claim 1, characterized in that, The material of the protruding part includes nylon or stainless steel.

13. A display device comprising a backlight module as claimed in any one of claims 1-12.

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