Alloyed zinc-based powder for die casting, die-cast product, vehicle-mounted backlight module and vehicle-mounted display device

Abstract

The application relates to the technical field of vehicle-mounted backlight modules, and particularly provides a die casting for improving white spots, a vehicle-mounted backlight module and a vehicle-mounted display device. The die casting comprises a die casting bottom plate, a die casting side plate integrally formed at the edge of the die casting bottom plate, and a bearing sink groove arranged around the joint of the die casting bottom plate and the die casting side plate, which is used for bearing the friction foreign matters between the middle iron frame and the die casting side plate. The die casting can effectively bear the friction foreign matters between the middle iron frame and the die casting side plate by arranging the bearing sink groove around the joint of the die casting bottom plate and the die casting side plate, so that the metal scraps are prevented from falling on the surface or the joint of the die casting, the probability of the scraps entering the backlight module is reduced when the die casting is vibrated, the light guide plate or the optical film material is prevented from being scratched, the optical defects such as white spots and white points are eliminated after the backlight module is lighted, and the product yield and the display effect are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of automotive backlight module technology, and more particularly to a die-cast part with improved white spot foreign matter, an automotive backlight module, and an automotive display device. Background Technology

[0002] With the development of automotive display technology, the requirements for narrow bezel design in automotive backlight products are becoming increasingly stringent, resulting in the continuous compression of the size of die-cast bezels. Existing die-cast bezels no longer have enough space to design conventional load-bearing platform structures.

[0003] During the assembly of the backlight module, the central iron frame needs to be installed in conjunction with the die-cast frame. Due to the lack of buffer or obstruction from the aforementioned support platform, metal debris and other frictional foreign objects generated during the assembly of the central iron frame and the die-cast part will fall directly and accumulate on the surface or joint of the die-cast part. When the product is subjected to vibration during subsequent transportation or use, these accumulated debris are very likely to shift and enter between the layers of film materials inside the backlight module, thereby scratching the light guide plate or other optical film materials. This results in optical defects such as white spots and white patches after the backlight module is lit, seriously affecting the product yield and display effect.

[0004] Therefore, existing technologies have defects and shortcomings, and need further improvement and development. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide a die-cast part with improved white spot foreign matter, an automotive backlight module and an automotive display device, which aims to solve the problem that in the prior art, the debris generated by the friction between the narrow bezel die-cast part and the central iron frame of the automotive backlight module can easily enter the backlight module, causing scratches on the light guide plate film material and producing white spots.

[0006] The technical solution adopted by this application to solve the technical problem is as follows: A die-casting part for improving white spot foreign matter, the die-casting part having opposing light source end and tail end, the light source end being used to fix the light strip of an automotive backlight module, wherein the die-casting part includes: Die-cast base plate; The die-cast side plate is integrally formed at the edge of the die-cast base plate; and a bearing groove is provided at the joint between the die-cast base plate and the die-cast side plate, the bearing groove being used to bear foreign objects that rub against the iron frame and the die-cast side plate.

[0007] Optionally, the depth of the bearing trough is set to 0.2-0.5 mm, and the depth of the bearing trough is set to 15%-30% of the thickness of the die-cast base plate.

[0008] Optionally, the light source end is used to fix the light strip; the supporting groove is provided with supplementary lighting parts at both corners of the tail end.

[0009] Optionally, the die-cast side plate is provided with a reflective coating.

[0010] Optionally, the support trough is provided with double-sided adhesive, and the upper surface of the double-sided adhesive is white.

[0011] Another technical solution adopted by this application to solve the technical problem is as follows: a vehicle-mounted backlight module, wherein, The vehicle-mounted backlight module includes the die-cast parts described above; A light guide plate, wherein the light guide plate is disposed in the die-cast part; Two limiting members are provided in the bearing grooves at the two corners of the tail end, and are located between the light guide plate and the die casting; Both of the limiting members are bonded and fixed to the bearing groove. When the limiting members are assembled between the light guide plate and the die-cast part, the limiting members are used to fix the light guide plate.

[0012] Optionally, both of the limiting members include: First limiting part; The second limiting part is integrally formed with the first limiting part, and the first limiting part and the second limiting part form an L-shaped structure; A bottom reflective portion, wherein the bottom reflective portion is connected between the first limiting portion and the second limiting portion; After the light guide plate is assembled, the first limiting part, the second limiting part, and the low reflection part cooperate to limit and fix the light guide plate, and reflect light to the light guide plate.

[0013] Optionally, the die-cast side plate is provided with limiting grooves at both corners of the tail end, and the limiting grooves are connected to the bearing sink. When the limiting member is assembled between the light guide plate and the die-cast part, the two limiting members are also respectively engaged with the two limiting grooves.

[0014] Optionally, the depth of the limiting groove is set to 1 / 5 to 1 / 3 of the width of the limiting member.

[0015] Another technical solution adopted by this application to solve the technical problem is as follows: an in-vehicle display device, wherein the in-vehicle display device includes the in-vehicle backlight module as described above.

[0016] Beneficial effects: This application provides a die-cast part with improved white spot foreign matter, an automotive backlight module, and an automotive display device. The die-cast part has a bearing groove around the joint between the die-cast base plate and the die-cast side plate, which can effectively bear the friction foreign matter between the iron frame and the die-cast side plate, prevent metal debris from falling onto the surface or joint of the die-cast part, reduce the probability of these debris entering the backlight module during vibration, thereby preventing the light guide plate or optical film from being scratched, eliminating optical defects such as white spots and white patches after the backlight module is lit, and significantly improving product yield and display effect. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the die-cast part provided in this application; Figure 2 This is a partially enlarged cross-sectional view of the die-casting provided in this application; Figure 3 It is provided in this application Figure 2 A schematic diagram of the deformed structure; Figure 4 This is a three-dimensional structural diagram of the vehicle backlight module provided in this application; Figure 5 This is an enlarged cross-sectional view of the rear end of the vehicle-mounted backlight module provided in this application; Figure 6 This is a partial three-dimensional enlarged schematic diagram of the fit between the limiting component and the die-casting component of the vehicle backlight module provided in this application; Figure 7 It is provided in this application Figure 5 A schematic diagram of a deformed structure; Figure 8 It is provided in this application Figure 7 Enlarged diagram of point A in the diagram; Explanation of reference numerals in the attached figures: 10. Vehicle-mounted backlight module; 11. Die-cast part; 12. Light guide plate; 13. Limiting part; 14. Light source end; 15. Tail end; 111. Die-cast base plate; 112. Die-cast side plate; 113. Limiting groove; 114. Bearing recess; 115. Light supplement part; 116. Double-sided adhesive; 131. First limiting part; 132. Second limiting part; 133. Bottom reflector part. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer and more explicit, the following detailed description of this application is provided with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0019] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] Please refer to the following: Figures 1 to 3The first embodiment of this application provides a die-cast part 11 for improving white spot foreign objects. The die-cast part 11 is used in an automotive backlight module 10. The die-cast part 11 has a light source end 14 and a tail end 15. The light source end 14 is used to fix the light strip of the automotive backlight module 10. The die-cast part 11 includes a die-cast base plate 111 and a die-cast side plate 112. The die-cast base plate 111 is the base part of the die-cast part 11, providing overall support and mounting surface. The thickness of the die-cast base plate 111 can be designed according to actual needs, as long as it has sufficient strength and rigidity as a reference. This application does not make specific limitations. The die-cast side plate 112 is integrally formed at the edge of the die-cast base plate 111, thereby forming a three-dimensional assembly space structure. All functional components of the automotive backlight module 10 are assembled in the three-dimensional assembly space. A bearing groove 114 is provided around the connection between the die-cast side plate 112 and the die-cast base plate 111. That is, a recessed structure is formed around the joint between the die-cast base plate 111 and the die-cast side plate 112 to bear foreign objects generated by friction between the iron frame and the die-cast side plate 112. It can effectively bear the friction foreign objects between the iron frame and the die-cast side plate 112, prevent metal debris from falling onto the surface or joint of the die-cast part 11, reduce the probability of these debris entering the backlight module during vibration, thereby preventing the light guide plate 12 or optical film from being scratched, eliminating optical defects such as white spots and white patches after the backlight module is lit, and significantly improving product yield and display effect.

[0022] In some embodiments, the depth of the bearing groove 114 is set to 0.2-0.5 mm, and the depth of the bearing groove 114 accounts for 15%-30% of the thickness of the die-cast base plate 111. For example, when the thickness of the die-cast base plate 111 is 2.5 mm, the depth of the bearing groove 114 can be 0.38-0.75 mm; when the thickness of the die-cast base plate 111 is 3 mm, the depth of the bearing groove 114 can be 0.45-0.9 mm. In a preferred embodiment, the depth of the bearing groove 114 is 0.3 mm, accounting for 22.5% of the thickness of the die-cast base plate 111. This effectively collects foreign matter generated by friction without excessively weakening the structural strength.

[0023] It is important to emphasize that the light source end 14 of the die-cast part 11 is used to fix the light strip, while the tail end 15 is positioned away from the light strip. Consequently, the brightness at the tail end 15 will be lower than that at the light source end 14. Supplementary light sections 115 are provided at both corners of the tail end 15 of the supporting recess 114. These supplementary light sections 115 can compensate for the uneven light distribution that may be caused by the presence of the supporting recess 114, ensuring a more uniform light distribution in the backlight module. The supplementary light sections 115 may be provided with a light-emitting coating or a reflective sheet, etc.

[0024] In some embodiments, the die-cast side plate 112 is provided with a reflective coating, which can improve light utilization, and the coating thickness is typically 0.01-0.1 mm.

[0025] In some embodiments, double-sided adhesive tape 116 is provided on the support trough 114, and the upper surface of the double-sided adhesive tape 116 is white. The double-sided adhesive tape 116 can both stick and fix friction foreign objects and reflect light, thereby improving light utilization.

[0026] Please refer to further details. Figures 4 to 6 In the second embodiment of this application, a vehicle-mounted backlight module 10 is also provided, including a die-cast part 11, a light guide plate 12, and two limiting members 13. Other structures of the vehicle-mounted backlight module are existing technologies and will not be described in detail here. The die-cast part 11 has a die-cast base plate 111 and a die-cast side plate 112, with the side plate 112 integrally formed at the edge of the base plate 111. The light guide plate 12 is disposed in the die-cast part 11, and the light source end 14 is the mounting end of the lamp strip of the vehicle-mounted backlight module 10. Both limiting members 13 are disposed at the tail end 15, and both limiting members 13 are located between the light guide plate 12 and the die-cast part 11. When the limiting members 13 are assembled between the light guide plate 12 and the die-cast part 11, both limiting members 13 are bonded and fixed to the die-cast base plate 111.

[0027] The vehicle-mounted backlight module 10 has two limiting members 13 set at the rear end 15, which are positioned between the light guide plate 12 and the die-cast part 11 and are bonded and fixed to the die-cast base plate 111. Through the cooperation of the L-shaped structure and the bottom reflective part 133, the light guide plate 12 can be limited and fixed from multiple directions. At the same time, through the dual fixing method of bonding and snapping with the die-cast part 11, the displacement of the light guide plate 12 caused by low-frequency vibration during vehicle operation is effectively prevented, thereby avoiding the abnormal noise problem caused by the shaking of the light guide plate 12, improving the stability of the vehicle-mounted backlight module 10 and the user experience. Finally, it solves the problem that the rubber structure fixing the light guide plate 12 in the vehicle-mounted backlight module 10 is easy to loosen in the prior art.

[0028] Please refer to further details. Figure 4 Both limiting members 13 include a first limiting part 131, a second limiting part 132, and a bottom reflective part 133. The second limiting part 132 is integrally formed with the first limiting part 131, and the first limiting part 131 and the second limiting part 132 form an L-shaped structure. The bottom reflective part 133 connects between the first limiting part 131 and the second limiting part 132. After the light guide plate 12 is assembled, the first limiting part 131, the second limiting part 132, and the bottom reflective part 133 cooperate to limit and fix the light guide plate 12 and reflect light to the light guide plate 12. Ultimately, the limiting member 13 can not only fix the light guide plate 12 and prevent the light guide plate 12 from producing abnormal noise due to vibration during vehicle operation, but also reflect light back to the light guide plate 12 through the bottom reflective part 133, thereby improving the light utilization rate of the backlight module.

[0029] Please refer to further details. Figures 7 to 8In some embodiments, limiting grooves 113 are provided at the two corners of the die-cast side plate 112 at the rear end 15 of the vehicle backlight module 10, and the limiting grooves 113 are connected to the bearing recess 114; when the limiting member 13 is assembled between the light guide plate 12 and the die-cast part 11, the two limiting members 13 are also respectively engaged with the two limiting grooves 113. The limiting members 13 are fixed by the limiting grooves 113, reducing the displacement of the limiting members 13 caused by repeated friction, thereby avoiding the formation of gaps between the light guide plate 12 and the backlight module, and optimizing the problem of abnormal noise in the light guide.

[0030] In some embodiments, the depth L1 of the limiting groove 113 is set to 1 / 5 to 1 / 3 of the width L2 of the limiting member 13. Limiting the depth of the limiting groove 113 to 1 / 5 to 1 / 3 of the width of the limiting member 13 can both fix the limiting member 13 through the limiting groove 113 and prevent the limiting member 13 from being displaced due to vibration, resulting in a gap between the light guide plate 12 and the backlight module, which would cause the light guide plate 12 to shake and make abnormal noise; it can also prevent the limiting groove 113 from being too deep, resulting in the die-cast side plate 112 at the limiting groove 113 being too thin, which would reduce the strength of the die-cast part 11; while ensuring that the depth of the limiting groove 113 is sufficient to fix the limiting member 13, the depth of the limiting groove 113 will not affect the structural strength of the die-cast part 11.

[0031] The third embodiment of this application provides an in-vehicle display device, wherein the in-vehicle display device includes the in-vehicle backlight module 10 as described in the second embodiment of this application above. This effectively avoids white spot display abnormalities in the in-vehicle display device.

[0032] In summary, this application provides a die-cast part with improved white spot foreign matter, an automotive backlight module, and an automotive display device. The die-cast part includes a die-cast base plate disposed along the horizontal direction; a die-cast side plate disposed along the height direction, the die-cast side plate being integrally formed at the edge of the die-cast base plate, the die-cast side plate having an outer peripheral surface of the side frame and a top surface of the side frame facing away from the die-cast base plate; and a plurality of first limiting grooves disposed on the bottom surface of the side frame for engaging with a first buckle on the housing to limit the die-cast part and the housing in the horizontal direction. The die-cast part has several first limiting grooves opened on the bottom surface of the side frame of the die-cast side plate. The housing has several first buckles arranged along the Z-axis direction, which correspond one-to-one with the first limiting grooves. When the die-cast part is assembled into the housing along with the vehicle backlight module, the first buckles gradually approach and enter the first limiting grooves. Under the constraint of the bottom of the first limiting grooves, the housing and the die-cast part are limited in the X and Y axes, so that the vehicle backlight module and the housing can also be limited in the X and Y axes.

[0033] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A die-casting part for improving white spot foreign matter, the die-casting part having opposing light source end and tail end, the light source end being used to fix the light strip of an automotive backlight module, characterized in that, The die-cast part includes: Die-cast base plate; The die-cast side plate is integrally formed at the edge of the die-cast base plate; and a bearing groove is provided at the joint between the die-cast base plate and the die-cast side plate, the bearing groove being used to bear foreign objects that rub against the iron frame and the die-cast side plate.

2. The die-casting part according to claim 1, characterized in that, The depth of the bearing sink is set to 0.2-0.5 mm, and the depth of the bearing sink is set to 15%-30% of the thickness of the die-cast base plate.

3. The die-casting part according to claim 1, characterized in that, The light source end is used to fix the light strip; the supporting groove is provided with supplementary lighting parts at both corners of the tail end.

4. The die-casting part according to claim 1, characterized in that, The die-cast side plate is provided with a reflective coating.

5. The die-casting part according to claim 1, characterized in that, The support trough is provided with double-sided adhesive tape, and the upper surface of the double-sided adhesive tape is white.

6. A vehicle-mounted backlight module, characterized in that, The vehicle-mounted backlight module includes a die-cast part as described in any one of claims 1-5; A light guide plate, wherein the light guide plate is disposed in the die-cast part; Two limiting members are provided in the bearing grooves at the two corners of the tail end, and are located between the light guide plate and the die casting; Both of the limiting members are bonded and fixed to the bearing groove. When the limiting members are assembled between the light guide plate and the die-cast part, the limiting members are used to fix the light guide plate.

7. The vehicle-mounted backlight module according to claim 6, characterized in that, Both of the aforementioned limiting members include: First limiting part; The second limiting part is integrally formed with the first limiting part, and the first limiting part and the second limiting part form an L-shaped structure; A bottom reflective portion, wherein the bottom reflective portion is connected between the first limiting portion and the second limiting portion; After the light guide plate is assembled, the first limiting part, the second limiting part, and the low reflection part cooperate to limit and fix the light guide plate, and reflect light to the light guide plate.

8. The vehicle-mounted backlight module according to claim 7, characterized in that, The die-cast side plate is provided with limiting grooves at both corners of the tail end, and the limiting grooves are connected to the bearing sink. When the limiting member is assembled between the light guide plate and the die-cast part, the two limiting members are also respectively engaged with the two limiting grooves.

9. The vehicle-mounted backlight module according to claim 8, characterized in that, The depth of the limiting groove is set to 1 / 5 to 1 / 3 of the width of the limiting member.

10. A vehicle-mounted display device, characterized in that, The vehicle-mounted display device includes the vehicle-mounted backlight module as described in any one of claims 6-9.

Images