Low-cost vehicle-mounted circuit board grounding structure

Abstract

The utility model discloses a low-cost vehicle-mounted circuit board grounding structure, which comprises a display screen module, a polyurethane hot melt adhesive, a backlight source module, a printed circuit board, solder paste, a metal support and a bending contact chip, and is characterized in that the display screen module comprises a glass cover plate, liquid optical cement and a display screen, and the backlight source module comprises a die-casting rear shell, a light guide plate, a backlight diaphragm and an LED lamp panel. The display screen has touch and display functions so as to reduce the cost and the product thickness, and the glass cover plate is optically attached to the display screen through the liquid optical cement, so that the display screen module is formed; the metal support is fixed to the back face of the die-casting rear shell through the screws, static electricity of the display screen is rapidly led out, transmission paths are reduced, and the static electricity leading-out speed is increased. And meanwhile, a grounding elastic sheet and conductive cotton are cancelled, so that the material cost and the manufacturing cost are reduced, and the market competitiveness of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted displays, in particular to a low-cost vehicle-mounted circuit board grounding structure. Background Art

[0002] ESD trends in automotive displays are primarily reflected in the continuous improvement of ESD protection technology and the expansion of its application scope. As automotive display technology continues to advance, the size and complexity of displays increase, placing increasing demands on ESD protection. ESD protection technology for automotive displays is constantly evolving. To protect the automotive multimedia system head unit from electrostatic discharge, ESD protection diodes are required to protect the multimedia system head unit's I / O ports from damage. Traditional discrete ESD diode designs suffer from limited circuit board space and interference issues, necessitating the adoption of new protection solutions to ensure system stability and reliability.

[0003] At the same time, the application scope of ESD protection for automotive displays is continuously expanding. As automotive displays increase in size and complexity, ESD protection technology is being applied not only to traditional interfaces like USB and HDMI, but also to new display technologies like OLED display modules. For example, OLED display modules are increasingly widely used in the automotive field. To ensure display stability, manufacturers typically perform ESD simulation tests on display modules to ensure stable operation in the complex electromagnetic environment of the vehicle.

[0004] Future development trends show that with the rapid development of electric vehicles and smart cars, the size and complexity of in-vehicle displays will continue to increase, and the requirements for ESD protection technology will also be higher. Otherwise, malfunctions such as screen flickering, black screen, and even freeze will occur.

[0005] Traditional solutions to anti-static issues for display screens involve using metal shrapnel or conductive cotton between the printed circuit board (PCB), the PCB, and the metal bracket to quickly conduct static electricity generated on the display screen through the metal bracket. However, this solution increases material and production costs. Furthermore, the PCB needs to be fixed to the die-cast housing with screws, further increasing material and production costs. Utility Model Content

[0006] To address the aforementioned issues with the existing technology, the present invention provides a low-cost grounding structure for automotive circuit boards. To address these issues, further reduce material and production costs, and enhance product competitiveness, we propose a low-cost grounding structure for automotive circuit boards. The bent contact piece is directly stamped and bent onto a metal bracket. Leveraging its high elasticity, it contacts the solder paste on the printed circuit board surface, quickly dissipating static electricity generated on the display screen without incurring additional costs. This solution reduces material and manufacturing costs and enhances product competitiveness.

[0007] To achieve the above-mentioned objectives, the present invention is implemented through the following technical solutions: a low-cost on-board circuit board grounding structure, comprising a display screen module, polyurethane hot melt adhesive, a backlight module, a printed circuit board, solder paste, a metal bracket, and a bent contact sheet, wherein the display screen module comprises a glass cover plate, liquid optical adhesive, and a display screen, and the backlight module comprises a die-cast rear shell, a light guide plate, a backlight diaphragm, and an LED light board. The display screen has touch and display functions, and to reduce costs and product thickness, the glass cover plate is optically bonded to the display screen via liquid optical adhesive to form the display screen module; the metal bracket is fixed to the back of the die-cast rear shell by screws, and the front of the die-cast rear shell is sequentially arranged from the inside to the outside with a light guide plate and a backlight diaphragm, and an LED light board is arranged between the light guide plate and the die-cast rear shell.

[0008] Furthermore, the display screen module and the backlight module are bonded and fixed by polyurethane hot melt adhesive. Polyurethane hot melt adhesive has the advantages of strong adhesion and adaptability to automated production, and has been used in display screen bonding in batches.

[0009] Furthermore, the metal bracket is made of galvanized sheet material, and the bent contact piece is directly stamped from the metal bracket, eliminating the need for grounding springs or conductive cotton. It directly supports the solder paste on the printed circuit board, quickly conducting away the static electricity generated on the surface of the display screen, thereby improving product reliability and reducing material and production costs.

[0010] Furthermore, the die-cast back shell material is magnesium alloy, which has the characteristics of light weight, high strength, fast heat dissipation, and easy molding. At the same time, there is a boss on the back to support the printed circuit board, and the printed circuit board is clamped with the bent contact piece on the metal bracket, eliminating the screw fixation, reducing material and manufacturing costs, and thus improving the product's market competitiveness.

[0011] Furthermore, the light guide plate is made of PMMA material.

[0012] Furthermore, the backlight film includes a reflective film, a diffusion film, and a brightness enhancement film, and the lamination order is the reflective film, the diffusion film, and the brightness enhancement film.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. Unlike traditional static dissipation methods such as grounding shrapnel or conductive cotton, this patented device utilizes a metal bracket to directly stamp and form a bent contact piece. This bent contact piece contacts the solder paste on the printed circuit board, quickly dissipating static electricity from the display, reducing the transfer path and increasing the speed of static dissipation. Furthermore, by eliminating the grounding shrapnel and conductive cotton, material and manufacturing costs are reduced, enhancing the product's market competitiveness.

[0015] 2. This patented printed circuit board fixing method adopts a double-layer clamping structure, using the protrusions on the back of the die-cast rear shell and the bent contact pieces of the metal bracket to clamp the printed circuit board. This can eliminate the traditional screw fixing method and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the utility model of fixing the printed circuit board with the die-cast rear shell and the bent contact piece;

[0018] Figure 3 Schematic diagram of the grounding of the bent contact piece of the utility model

[0019] Figure 4 This is a schematic diagram of the polyurethane hot melt adhesive fixation of the utility model;

[0020] In the figure: 1. Display screen module; 2. Polyurethane hot melt adhesive; 3. Backlight module; 4. Printed circuit board; 5. Solder paste; 6. Metal bracket; 7. Bent contact piece; 8. Glass cover; 9. Liquid optical adhesive; 10. Display screen; 11. Die-cast back shell; 12. Light guide plate; 13. Backlight film; 14. LED light board. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figures 1 to 4 As shown:

[0023] The present invention is a low-cost grounding structure for an on-board circuit board, comprising a display screen module 1, polyurethane hot melt adhesive 2, a backlight module 3, a printed circuit board 4, solder paste 5, a metal bracket 6, and a bent contact sheet 7. The display screen module 1 comprises a glass cover plate 8, liquid optical adhesive 9, and a display screen 10, while the backlight module 3 comprises a die-cast rear housing 11, a light guide plate 12, a backlight film 13, and an LED light board 14. The display screen 10 has touch and display functions, and to reduce cost and product thickness, the glass cover plate 8 is optically bonded to the display screen 10 via liquid optical adhesive 9, thereby forming the display screen module 1. The metal bracket 6 is fixed to the back of the die-cast rear housing 11 via screws 15. The front of the die-cast rear housing 11 is sequentially provided with a light guide plate 12 and a backlight film 13, from the inside out. An LED light board 14 is provided between the light guide plate 12 and the die-cast rear housing 11.

[0024] Reference embodiment: The metal bracket 6 is made of galvanized steel plate and has a metal bend where it contacts the printed circuit board 4. The bent contact piece 7 presses against the solder paste 5 on the printed circuit board 4 to quickly conduct the static electricity of the display screen 10. The bent contact piece 7 has the characteristics of high elasticity and contacts the solder paste 5 on the surface of the printed circuit board 4, thereby quickly conducting the static electricity generated on the surface of the display screen 10 and improving product reliability.

[0025] Reference embodiment: The die-cast rear shell 11 is made of magnesium alloy, which has the characteristics of light weight, high strength, fast heat dissipation, and easy molding. At the same time, there is a boss on the back to support the printed circuit board 4, and the printed circuit board 4 is clamped with the bent contact piece 7 on the metal bracket 6, eliminating the screw fixation, reducing material and manufacturing costs, and thus improving the product's market competitiveness.

[0026] Reference embodiment: The display screen module 1 and the backlight module 3 are bonded and fixed by polyurethane hot melt adhesive 2. The polyurethane hot melt adhesive 2 has the advantages of strong adhesion and adaptability to automated production, and has been used in batches for display screen bonding.

[0027] Reference embodiment: The light guide plate 12 is made of PMMA material with a relatively high refractive index, and its surface has pitting of different sizes, which improves the uniformity and brightness of light and makes the light more evenly distributed on the screen, thereby improving the display effect.

[0028] Reference embodiment: The backlight film 13 includes a reflective film, a diffusion film, and a brightness enhancement film, and the lamination order is reflective film, diffusion film, and brightness enhancement film; the main function is to change the propagation characteristics of light, thereby improving the brightness and contrast of the display device.

[0029] The embodiments of the present invention are only used to illustrate the present invention and do not limit the scope of the claims. Other substantially equivalent alternatives that can be thought of by those skilled in the art are all within the protection scope of the present invention.

Claims

1. A low-cost vehicle-mounted circuit board grounding structure, characterized in that: The invention comprises a display screen module (1), a backlight module (3), a printed circuit board (4), solder paste (5), and a metal bracket (6) which are arranged in sequence. A bent contact piece (7) is arranged on the inner side of the metal bracket (6). The display screen module (1) comprises a glass cover plate (8), a liquid optical adhesive (9), and a display screen (10). The backlight module (3) comprises a die-cast rear shell (11), a light guide plate (12), a backlight film (13), and an LED light board (14). The glass cover plate (8) is optically bonded to the display screen (10) through the liquid optical adhesive (9), thereby forming the display screen module (1). The metal bracket (6) is fixed to the back side of the die-cast rear shell (11) through screws (15). The front side of the die-cast rear shell (11) is arranged with a light guide plate (12) and a backlight film (13) in sequence from the inside to the outside. An LED light board (14) is arranged between the light guide plate (12) and the die-cast rear shell (11).

2. A low-cost vehicle-mounted circuit board grounding structure according to claim 1, characterized in that: The metal bracket (6) is made of galvanized steel plate and has a metal bend at the place where it contacts the printed circuit board (4). The bent contact piece (7) presses against the solder paste (5) at the printed circuit board (4) so ​​that static electricity on the display screen (10) can be quickly discharged through the contact between the bent contact piece (7) and the solder paste (5).

3. The low-cost vehicle-mounted circuit board grounding structure according to claim 1, characterized in that: The die-cast rear shell (11) is made of magnesium alloy. A boss is provided on the back of the die-cast rear shell (11). The boss presses against the front of the printed circuit board (4) so ​​that the printed circuit board (4) is clamped between the boss and the bent contact piece (7) to fix the printed circuit board (4) between the die-cast rear shell (11) and the metal bracket (6).

4. The low-cost vehicle-mounted circuit board grounding structure according to claim 1, characterized in that: The display screen module (1) and the backlight source module (3) are bonded and fixed by polyurethane hot melt adhesive (2).

5. The low-cost vehicle-mounted circuit board grounding structure according to claim 1, characterized in that: The light guide plate (12) is made of PMMA material.

6. The low-cost vehicle-mounted circuit board grounding structure according to claim 1, characterized in that: The backlight film (13) comprises a reflective film, a diffusion film and a brightness enhancement film, and the lamination order is the reflective film, the diffusion film and the brightness enhancement film.

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