A die-cast integrated backlight display module with EMC and RFI resistance

Abstract

This utility model belongs to the field of liquid crystal display technology, specifically relating to a die-cast integrated backlight display module with EMC and RFI resistance. It includes a PCB board and a backlight board. The PCB board is mounted on the backlight board via a mounting structure. At least one shielding frame protruding towards the PCB board is provided on the backlight board, and the shielding frame is die-cast together with the backlight board. After the PCB board is mounted on the backlight board, some electronic components on the PCB board are located within the shielding frame. The shielding frame is integrally formed on the backlight board, making the mold for the shielding frame identical to that of the backlight board, thus eliminating the need for separate molds, reducing costs. Furthermore, the size, shape, and wall thickness of the shielding frame can be customized according to the required component areas, offering high flexibility and easy adaptation to various vehicle models. The shielding frame is integrally die-cast with the backlight board, resulting in good overall stability and resistance to deformation and detachment.

Description

Technical Field

[0001] This utility model belongs to the field of liquid crystal display technology, specifically relating to a die-cast integrated backlight display module with anti-EMC and anti-RFI performance. Background Technology

[0002] Currently, automotive instrument panels, central control screens, or entertainment displays typically consist of a cover glass, a display, a backlight board, a PCB system, and a rear shell. The PCB contains many components, and due to EMC (electromagnetic compatibility) radiation issues, some components on the PCB need EMC shielding, i.e., adding shielding covers. The EMC shielding covers on the PCB are mainly used to reduce electromagnetic interference (EMI) and radio frequency interference (RFI) to ensure the stable performance of electronic equipment. In other words, the EMC shielding covers have two functions: first, to prevent battery interference: effectively blocking external electromagnetic interference sources from affecting sensitive electronic components on the PCB motherboard, while preventing electromagnetic interference generated by electronic components on the motherboard from propagating to the outside world, ensuring the signal transmission quality and performance stability of the electronic equipment; second, to protect critical components: protecting critical components on the PCB from damage caused by collisions, drops, etc., during production, testing, and transportation.

[0003] In existing technologies, there are two methods for installing shielding covers: one is surface mount, where the shielding cover is soldered onto pads on the PCB motherboard using surface mount technology. The pad width is generally between 0.7-1mm. To ensure soldering strength and prevent solder buildup, a long-leg design can be used. The other is shielding clip installation, where the shielding clips are first soldered onto the circuit board using SMT assembly, and then the shielding cover is installed between these clips. For the first method, since the shielding covers required for each vehicle model are different, each shielding cover needs to be custom-molded, which is costly. For the second method, although no mold is required, the clamping force of the shielding clips is unstable, and they are prone to falling off under high-intensity vibration or acceleration impact, which can easily damage components. Utility Model Content

[0004] This invention aims to provide a die-cast integrated backlight display module with EMC and RFI resistance. It not only eliminates the need for separate molds for the shielding cover, reducing costs, but also prevents damage to components caused by the shielding cover falling off under high-intensity vibration or acceleration impact.

[0005] Therefore, the technical solution adopted by this utility model is as follows: a die-cast integrated backlight display module with anti-EMC and anti-RFI performance, including a PCB board and a backlight board. The PCB board is mounted on the backlight board through a mounting structure. The backlight board is provided with at least one shielding frame protruding towards the PCB board, and the shielding frame is die-cast together with the backlight board. When the PCB board is mounted on the backlight board, some electronic components on the PCB board are located inside the shielding frame.

[0006] As a preferred embodiment of the above scheme, the mounting structure includes positioning posts and mounting posts disposed on the backlight panel, and at least two positioning posts are provided. The mounting posts are provided with bolt holes for mounting fixing bolts. The upper end of the positioning posts is provided with a truncated cone. The PCB board is provided with positioning holes for the positioning posts to pass through, and at least one positioning hole is provided as a slot hole.

[0007] Further preferably, the shielding frame is coated with protective material, and the protective coating is a waterproof coating or a shielding coating.

[0008] Further preferably, the sidewall of the shielding frame is provided with a draft angle.

[0009] Further preferably, the backlight panel is provided with support protrusions for supporting the PCB board, and the support protrusions are configured in a cross shape so that they can also serve as positioning points during automated installation.

[0010] Further preferably, the shielding frame has a notch for wiring at one end, and the backlight panel has a through slot for the connecting wire to pass through.

[0011] The beneficial effects of this utility model are as follows: the shielding frame is integrally formed on the backlight panel, so that the mold of the shielding frame is the same as that of the backlight panel. Therefore, there is no need to open a separate mold, which reduces the cost. Moreover, the size, shape and wall thickness of the shielding frame can be customized according to the corresponding component area as needed, which is highly flexible and easy to adapt to various vehicle models. The shielding cover and the backlight panel are integrally die-cast, which has good overall stability and is not easy to deform or fall off. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the present invention.

[0013] Figure 2 This is a schematic diagram of the PCB board in this utility model.

[0014] Figure 3 This is a schematic diagram of the backlight panel in this utility model.

[0015] Attached reference numerals: PCB board-100, positioning hole-120, backlight board-200, positioning post-210, cone-211, mounting post-220, bolt hole-221, support protrusion-230, wire through groove-240, shielding frame-250. Detailed Implementation

[0016] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0017] like Figure 1-3As shown, a die-cast integrated backlight display module with EMC and RFI resistance is mainly composed of a PCB board 100 and a backlight board 200, with the PCB board 100 mounted on the backlight board 200 via a mounting structure. At least one shielding frame 250 protruding towards the PCB board 100 is provided on the backlight board 200, and the shielding frame 210 is die-cast together with the backlight board 200. When the PCB board 100 is mounted on the backlight board 200, some electronic components on the PCB board 100 are located within the shielding frame 250.

[0018] The mounting structure includes positioning posts 210 and mounting posts 220 disposed on the backlight panel 200, with at least two positioning posts 210. The mounting posts 220 have bolt holes 221 for mounting bolts, and a truncated cone 211 is provided at the upper end of each positioning post 210. Correspondingly, the PCB board 100 has positioning holes 120 through which the positioning posts 210 pass, with at least one positioning hole 120 being a slotted hole. In this embodiment, two positioning posts are provided, and one of the positioning holes is a slotted hole.

[0019] Preferably, a protective material is sprayed inside the shielding frame 250. The protective coating is a waterproof coating or a shielding coating. Spraying a waterproof coating can increase the waterproof effect, and spraying a shielding coating can enhance the shielding effect.

[0020] To facilitate demolding of the shielding frame, a draft angle is provided on the side wall of the shielding frame 250, or a chamfer is provided on the shielding frame.

[0021] Preferably, the backlight panel 200 is provided with a support protrusion 230 for supporting the PCB board, and the support protrusion 230 is set in a cross shape so that it can also be used as a positioning point in automated installation.

[0022] To facilitate trace routing, a notch for trace routing is provided at the end of the shielding frame 250, and a trace routing groove 240 is provided on the backlight board 200 for the connecting wires to pass through. Conductive silicone can also be applied into the notch, and the conductive silicone is connected to the exposed copper area of ​​the PCB trace, thereby optimizing electrostatic protection.

Claims

1. A die-cast integrated backlight display module with EMC and RFI resistance, comprising a PCB board (100) and a backlight board (200), wherein the PCB board (100) is mounted on the backlight board (200) via a mounting structure, characterized in that: The backlight panel (200) is provided with at least one shielding frame (250) protruding towards the PCB board (100), and the shielding frame (210) and the backlight panel (200) are die-cast together. When the PCB board (100) is installed on the backlight panel (200), some electronic components on the PCB board (100) are located inside the shielding frame (250).

2. The die-cast integrated backlight display module with EMC and RFI resistance as described in claim 1, characterized in that: The mounting structure includes a positioning post (210) and a mounting post (220) disposed on the backlight plate (200), and at least two positioning posts (210) are provided. The mounting post (220) is provided with bolt holes (221) for mounting bolts. The upper end of the positioning post (210) is provided with a truncated cone (211). The PCB board (100) is provided with positioning holes (120) for the positioning posts (210) to pass through. At least one positioning hole (120) is a slot hole.

3. The die-cast integrated back light display module with anti-EMC and RFI performance according to claim 1, characterized in that: The shielding frame (250) is coated with protective material, which is a waterproof coating or a shielding coating.

4. The die-cast integrated backlight display module with EMC and RFI resistance as described in claim 1, characterized in that: The shielding frame (250) has a draft angle on its side wall.

5. The die-cast integrated back light display module with anti-EMC and RFI performance according to claim 1, characterized in that: The backlight panel (200) is provided with a support protrusion (230) for supporting the PCB board, and the support protrusion (230) is configured as a cross shape.

6. The die-cast integrated backlight display module with EMC and RFI resistance as described in claim 1, characterized in that: The shielding frame (250) has a notch for wiring at one end, and the backlight panel (200) has a through slot (240) for the connecting wire to pass through.

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