CN202563845U - Structure for reducing electromagnetic compatibility (EMC) of light-emitting diode (LED) display screens - Google Patents

Abstract

The utility model relates to a structure for reducing the EMC of LED display screens. Existing products only process electromagnetic radiation inside a display screen box body instead of the electromagnetic radiation on the front side of a display screen. The structure comprises a primary injection mask, a secondary injection mask, copper grids and a printed circuit board (PCB). The copper grids are arranged between the primary injection mask and the secondary injection mask to form an EMC shielding mask, and the EMC shielding mask is connected with metallization screw holes in the PCB through bolts. LED placing holes are opened on the primary injection mask and the secondary injection mask and evenly distributed on the EMC shielding mask, and the LED lights arranged on the EMC shielding mask are arranged on the corresponding LED placing holes. The copper grids are communicated with the bolts to enable the EMC shielding mask to be grounded. According to the structure for reducing the EMC of LED display screens, the EMC shielding mask internal copper grids serve as an electromagnetic shielding layer, hence, the filtering effect of the copper grids can be achieved by changing the number of the copper grids.

Description

A kind of reduction LED display EMC structure

Technical field

The utility model belongs to the LED display technical field, relates to a kind of reduction LED display EMC structure.

Background technology

At present, LED display EMC authentication (Electro Magnetic Compatibility authentication) has caused very big concern in European Union market, and especially in the German market, EMC test authentication has been the essential condition that LED display gets into Germany.The EMC standard testing is being done one by one by domestic LED enterprise, all wants to take the lead in obtaining the superiority of European market.Numerous LED display enterprise is the electromagnetic radiation of processes and displays screen box house, and does not do any processing in the front of display screen, thus cause display screen just can not get suppressing in the face of electromagnetic radiation.As to reduce the positive electromagnetic radiation of display screen, and must outside display screen, lay a copper mesh, such display screen not only has disappearance in outward appearance, and has potential safety hazard.

EMC comprises the requirement of two aspects:

(1.EMI electromagnetic interference (EMI)): the equipment that is meant on the one hand can not surpass certain limit value to the electromagnetic interference (EMI) that the place environment produces in normal course of operation;

(2.EMS Electronmagnetic Stamina): be meant that on the other hand utensil has immunity to interference to a certain degree, i.e. electromagnetic susceptibility to the electromagnetic interference (EMI) that exists in the environment of place.。

Summary of the invention

The utility model is difficult to reduce to existing LED display EMC, and a kind of reduction LED display EMC structure is provided.

The utility model solves the technical scheme that its technical matters adopted:

The utility model comprises injection moulding face shield, quadric injection mould face shield, copper mesh and pcb board one time.Between injection moulding face shield and quadric injection mould face shield, copper mesh is set, forms EMC shielding face shield, EMC shielding face shield is connected with metallization screw hole on the pcb board through screw.

All have the LED putting hole on a described injection moulding face shield and the quadric injection mould face shield, described LED putting hole arranges that evenly the mounted LEDs lamp is arranged on the corresponding LED putting hole on the pcb board on EMC shielding face shield.

Described copper mesh and described screw conducting, thus make EMC shielding face shield ground connection.

The beneficial effect of the utility model: as electro-magnetic screen layer, the filter effect of copper mesh can reach through changing its copper mesh order number through EMC shielding face shield internal copper net.

Description of drawings

Fig. 1 is an EMC shielding face shield decomposing schematic representation in the utility model;

Fig. 2 is a copper mesh structural representation in the utility model;

Fig. 3 is an EMC shielding face shield in the utility model;

Fig. 4 is an A partial enlarged drawing among Fig. 3;

Fig. 5 is the utility model partial schematic diagram;

Fig. 6 is the utility model schematic cross-section.

Embodiment

Below in conjunction with accompanying drawing the utility model is described further.

Like Fig. 1 and shown in Figure 5; EMC ground plane 4 cover in the present embodiment comprises injection moulding face shield 1, quadric injection mould face shield 3, copper mesh 2; Between injection moulding face shield 1 and quadric injection mould face shield 3, copper mesh 2 is set; The order number of copper mesh is between the 30-60 order, and one time injection moulding face shield, quadric injection mould face shield and copper mesh form EMC shielding face shield 4, referring to Fig. 3.

Like Fig. 2 and shown in Figure 6, on copper mesh, have the through hole 5 of screw, the diameter of the through hole of this screw is slightly less than the external diameter of screw; Make copper mesh well contact with screw; And screw 7 is connected with metallization screw hole 10 on the pcb board 9, thereby makes EMC shielding face shield ground connection, and the screw in the present embodiment adopts pan head screw; Pan head screw passes EMC shielding face shield and is connected with pcb board, referring to Fig. 4.

As shown in figures 1 and 3; On injection moulding face shield and quadric injection mould face shield, all have LED putting hole 6; The copper mesh in middle layer can not expose to the LED putting hole; The LED putting hole arranges that evenly as shown in Figure 5, mounted LEDs lamp 8 is arranged on the corresponding LED putting hole on the pcb board on EMC shielding face shield.

The processing mode of present embodiment: do not influence outward appearance in order to allow copper mesh, need make full use of face shield.Its final purpose is in face shield, to add copper mesh, and specific practice can adopt the quadric injection mould method:

Injection moulding for the first time forms an injection moulding face shield; On an injection moulding face shield, be covered with one deck then than the slightly little special copper mesh of injection moulding mask size; The order number of copper mesh is with between the 30-60 order; Accomplish the quadric injection mould face shield through quadric injection mould then, make injection moulding face shield, copper mesh, the synthetic EMC of quadric injection mould set of mask shield face shield through quadric injection mould.

Claims (2)

1. one kind is reduced LED display EMC structure; Comprise injection moulding face shield, quadric injection mould face shield, copper mesh and pcb board one time; It is characterized in that: between injection moulding face shield and quadric injection mould face shield, copper mesh is set; Form EMC shielding face shield, EMC shielding face shield is connected with metallization screw hole on the pcb board through screw;

All have the LED putting hole on a described injection moulding face shield and the quadric injection mould face shield, described LED putting hole arranges that evenly the mounted LEDs lamp is arranged on the corresponding LED putting hole on the pcb board on EMC shielding face shield;

Described copper mesh and described screw conducting, thus make EMC shielding face shield ground connection.

2. a kind of reduction LED display EMC structure according to claim 1 is characterized in that: cross the external diameter of the through-hole diameter of screw less than screw on the described copper mesh, make copper mesh contact with screw.

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