Backlight module for preventing interference signals

Abstract

The utility model discloses a backlight module for preventing interference signals, comprising: a backlight assembly and a conductive metal shielding cover; the backlight assembly comprises an FPC, a conductive frame and a plastic shell, the conductive frame is sleeved on the outside of the plastic shell, the metal shielding cover is sleeved on the outside of the conductive frame, the FPC is fixed on the plastic shell, the FPC and the conductive frame are grounded, and the metal shielding cover is grounded to the FPC through the conductive frame. The utility model adds a metal shielding cover without changing other structures of the original design, thereby reducing costs. The metal shielding cover is used to shield and absorb noise, and then the electrical signal absorbed by the metal shielding cover can be exported to the grounding network of the FPC through the conductive frame, preventing the signal emitted by the antenna from interfering with the MIPI line data transmission on the FPC, resulting in display abnormalities, and at the same time, preventing external signals from interfering with the radio frequency signals of the external antenna of the mobile phone during MIPI data transmission.

Description

Technical Field

[0001] The utility model relates to the field of backlight, in particular to a backlight module for preventing interference signals. Background Art

[0002] After the display screen is assembled on the whole machine, the components on the IC and FPC are easily interfered by the signal emitted by the antenna, causing the display screen to be unstable and abnormal. In the prior art, to address this problem, R&D personnel usually change the structure of the whole machine back shell and the position of the antenna to keep the antenna away from the IC and FPC to reduce the signal interference emitted by the antenna. However, this solution requires significant structural changes, increases the cost of structural R&D and mold opening, and the interference signal still exists. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a backlight module for preventing interference signals.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A backlight module for preventing interference signals comprises: a backlight assembly and a conductive metal shielding cover; the backlight assembly comprises an FPC, a conductive frame and a plastic shell, the conductive frame is sleeved on the outside of the plastic shell, the metal shielding cover is sleeved on the outside of the conductive frame, the FPC is fixed on the plastic shell, the FPC and the conductive frame are grounded, and the metal shielding cover is grounded to the FPC through the conductive frame.

[0006] In one embodiment, the backlight assembly further includes a light source; the light source is disposed on the inner side of the plastic shell.

[0007] In one embodiment, the backlight assembly further includes a light guide plate, the light guide plate is installed on one side of the light source, and the light emitting direction of the light source is toward the length direction of the light guide plate.

[0008] In one embodiment, one end of the FPC is fixed on the plastic shell, and the other end is bent into the metal shielding cover.

[0009] In one embodiment, the metal shielding cover is provided with a first opening for accommodating the FPC to penetrate therein on one side of the binding position between the FPC and the plastic shell.

[0010] In one embodiment, the metal shield is provided with a second opening of the FPC on the side opposite to the first opening, and the second opening is used to accommodate the FPC to pass through.

[0011] In one embodiment, the metal shielding cover is made of aluminum.

[0012] In one embodiment, the light source is an LED lamp.

[0013] In one embodiment, the conductive frame is an annular frame.

[0014] In one embodiment, the conductive frame is an iron frame.

[0015] Compared with the prior art, the utility model has at least the following advantages:

[0016] The utility model provides a backlight module for preventing interference signals by setting a backlight assembly and a conductive metal shielding cover. The backlight assembly includes an FPC, a conductive frame and a plastic shell. The conductive frame is sleeved on the outside of the plastic shell, and the metal shielding cover is sleeved on the outside of the conductive frame, so that the metal shielding cover is grounded to the FPC through the conductive frame. The utility model adds a metal shielding cover without changing other structures of the original design, thereby reducing costs. The metal shielding cover is used to shield and absorb noise, and then the electrical signal absorbed by the metal shielding cover can be exported to the grounding network of the FPC through the conductive frame, preventing the signal emitted by the antenna from interfering with the MIPI line data transmission on the FPC, resulting in display abnormalities, and at the same time, preventing external signals from interfering with the radio frequency signal of the external antenna of the mobile phone during MIPI data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0018] Figure 1 It is a partial cross-sectional structural schematic diagram of a backlight module for preventing interference signals in one embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of a metal shielding cover in one embodiment of the utility model;

[0020] Figure 3 The figure is a front structural diagram of a backlight module for preventing interference signals in one embodiment of the utility model.

[0021] Reference numerals:

[0022] Backlight assembly 10 , FPC 11 , IC 12 , metal shielding cover 20 , first opening 21 , second opening 22 , and conductive glue 23 . DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0024] This application proposes a backlight module that prevents interference signals. Figure 1 , Figure 2 and Figure 3 , including: a backlight assembly 10 and a conductive metal shielding cover 20. The backlight assembly 10 includes an FPC 11, a conductive frame 12 and a plastic shell 13. The conductive frame 12 is sleeved on the outside of the plastic shell 13, and the metal shielding cover 20 is sleeved on the outside of the conductive frame 12, so that the metal shielding cover 20 is grounded to the FPC 11 through the conductive frame 12. The metal shielding cover 20 is used to shield and absorb noise, and then the electrical signal absorbed by the metal shielding cover 20 can be exported to the grounding network of the FPC 11 through the conductive frame 12, preventing the signal emitted by the antenna from interfering with the mipi line data transmission on the FPC 11, resulting in display abnormalities, and at the same time, preventing external signals from interfering with the radio frequency signal of the external antenna of the mobile phone during mipi data transmission.

[0025] In one embodiment, the backlight assembly 10 further includes a light source, and the light emitted by the light source provides illumination for the display screen, so that the liquid crystal molecules formed in the display screen appear in the visible area. Specifically, the light source is arranged on the inner side of the plastic shell 13. Furthermore, the light source is an LED lamp, which is small in size, easy to set up, and has low energy consumption. It does not generate electromagnetic interference in the working state, has a long service life, reduces the number of maintenance and replacement, and reduces the failure rate of the product. In addition, the backlight assembly 10 further includes a light guide plate, which is installed on one side of the light source, and the light emission direction of the light source is toward the length direction of the light guide plate. The light guide plate is used to transform the point light source of the light source into a surface light source, so that the light emitted by the light source reaches the display screen more evenly.

[0026] Please refer again Figure 1 and Figure 3 The material of FPC11 is soft and has good bendability. In the present application, one end of FPC11 is fixed on the plastic shell 13, and the other end is bent into the metal shielding cover 20, which can reduce the overall length of a backlight module for preventing interference signals, and reduce the frame, which can reduce the invisible area of ​​the display screen. A welding surface is provided on FPC11, and a component area is provided on the welding surface, and electronic components can be welded on the component area. FPC11 is provided with a steel sheet on the opposite side of the component area. Since the steel sheet has great hardness, the steel sheet can support the load-bearing caused by welding electronic components in the component area, thereby avoiding bending of FPC11. FPC11 is arranged flat for easy fixation.

[0027] In one embodiment, the metal shield 20 is pressed tightly against the surface of the FPC 11. During shaking, the metal shield 20 is easily displaced from the FPC 11, and there is a risk that the metal shield 20 will hold the components on the FPC 11. To address this problem, the metal shield 20 is provided with a first opening 21 for accommodating the FPC 11 on one side of the binding position between the FPC 11 and the plastic shell 13, so as to prevent the components welded on the FPC 11 from falling off and causing product failure. Preferably, the metal shield 20 is made of aluminum, which has excellent corrosion resistance and oxidation resistance.

[0028] It should be noted that the anti-interference signal backlight module also includes IC14, which is arranged on one side of the fixed end of FPC11. The metal shielding cover 20 is set at the position of the anti-interference signal backlight module that is most susceptible to interference, that is, the position corresponding to the FPC11 component area and IC14, to further improve the anti-interference performance of the anti-interference signal backlight module.

[0029] Further, please refer again to Figure 2 The metal shield 20 is provided with a second opening 22 of the FPC 11 on the opposite side of the first opening 21. The second opening 22 is used to accommodate the FPC 11 to pass through. On the one hand, the flat length of the FPC 11 is long enough. On the other hand, the heat generated by the FPC 11 can be quickly dissipated from the first opening 21 and the second opening 22, ensuring that the highest temperature of the product is kept at a low level. In addition, conductive glue 23 is provided on the bonding surface of the metal shield 20 and the conductive frame 12, so that the electrical connection between the metal shield 20 and the conductive frame 12 is more stable.

[0030] In one embodiment, the conductive frame 12 is hollowed out in the middle and is an annular frame as a whole, which can reduce the weight of the product and save material consumption and reduce costs of the conductive frame 12. Preferably, the conductive frame 12 is an iron frame.

[0031] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A backlight module for preventing interference signals, characterized in that: include: A backlight assembly and a conductive metal shield; The backlight assembly includes an FPC, a conductive frame and a plastic shell, the conductive frame is sleeved on the outside of the plastic shell, the metal shielding cover is sleeved on the outside of the conductive frame, the FPC is fixed on the plastic shell, the FPC and the conductive frame are grounded, and the metal shielding cover is grounded to the FPC through the conductive frame.

2. The anti-interference signal backlight module according to claim 1, characterized in that: The backlight assembly further comprises a light source; the light source is arranged on the inner side of the plastic shell.

3. The anti-interference signal backlight module according to claim 2, characterized in that: The backlight assembly further includes a light guide plate, which is mounted on one side of the light source, and the light emitting direction of the light source is toward the length direction of the light guide plate.

4. The anti-interference signal backlight module according to claim 1, characterized in that: One end of the FPC is fixed on the plastic shell, and the other end is bent into the metal shielding cover.

5. The anti-interference signal backlight module according to claim 1, characterized in that: The metal shielding cover is provided with a first opening for accommodating the FPC to penetrate therein on one side of the binding position between the FPC and the plastic shell.

6. The anti-interference signal backlight module according to claim 5, characterized in that: The metal shield is provided with a second opening of the FPC on the side opposite to the first opening, and the second opening is used to accommodate the FPC to pass through.

7. The anti-interference signal backlight module according to claim 1, characterized in that: The material of the metal shielding cover is aluminum.

8. The backlight module for preventing interference signals according to claim 2, characterized in that: The light source is an LED lamp.

9. The backlight module for preventing interference signals according to claim 1, characterized in that: The conductive frame is an annular frame.

10. The backlight module for preventing interference signals according to claim 1, characterized in that: The conductive frame is an iron frame.

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