Anti-interference circuit board and display module

Abstract

The utility model discloses an anti-interference circuit board and a display module, and the circuit board comprises an FPC which comprises a first side and a second side, the first side is used for arranging a first wiring structure of an auxiliary board, and the second side is used for arranging a second wiring structure of a main screen. The AGND end common ground pin of the first wiring structure is electrically connected with the GND end common ground pin of the second wiring structure in a single-point mode. Compared with the prior art, the FPC has only one common ground end, which is different from a plurality of common ground ends in the prior art, so that the AGND end of the auxiliary board and the GND end of the main screen are prevented from having a plurality of common ground ends on the FPC, mutual interference between the auxiliary board and the main screen is prevented, and the problem of display splash screen caused by interference of the charging USB of the auxiliary board on the Mipi signal of the main screen is solved.

Description

Technical Field

[0001] The utility model relates to the field of display screens, in particular to an anti-interference circuit board and a display module. Background Art

[0002] The main board of a mobile phone is usually located in the upper area of ​​the phone, and the sub-board (with USB charging cable, antenna, speaker, etc.) is located in the bottom area of ​​the phone, with a battery connected in the middle. Therefore, the phone needs to be connected with a transfer FPC to electrically connect the sub-board and the main board. Most manufacturers now design this transfer FPC on the display module FPC and use the display module FPC to connect. The sub-board circuit is set on the display module FPC, because the USB circuit, speaker, antenna and other wiring have special requirements and the current is large, and the sub-board circuit is designed with a common ground with the main screen circuit, staggered connection, and has multiple common ground terminals. It is easy for the sub-board circuit to interfere with the main screen circuit, resulting in display abnormalities or TP touch insensitivity and other problems. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide an anti-interference circuit board.

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

[0005] An anti-interference circuit board includes: an FPC, the FPC includes a first side and a second side, the first side is used to set a first routing structure of a sub-board, the second side is used to set a second routing structure of a main screen, an AGND common ground pin is set on the first routing structure, a GND common ground pin is set on the second routing structure, and the AGND common ground pin of the first routing structure is electrically connected to the GND common ground pin of the second routing structure at a single point.

[0006] In one of the embodiments, electronic components are also arranged on the FPC.

[0007] In one embodiment, a steel plate is provided on the opposite side of the FPC where the electronic components are provided.

[0008] In one embodiment, the FPC further includes a main connector end and a secondary connector end, the main connector end is arranged at the lower end of the FPC, and the secondary connector end is arranged at the upper end of the FPC.

[0009] In one embodiment, the FPC is in a "J" shape.

[0010] A display module comprises the above-mentioned anti-interference circuit board, cover plate, display, backlight assembly and light source processing assembly; the backlight assembly is recessed with a receiving cavity, the light source processing assembly is arranged in the receiving cavity, the display is arranged in the light source processing assembly, the FPC is electrically connected to the display, and the cover plate covers the backlight assembly to enclose the receiving cavity.

[0011] In one embodiment, the backlight assembly includes a light source assembly, and the light source assembly is an LED lamp.

[0012] In one embodiment, the light source processing assembly includes an upper polarizer and a lower polarizer, and the display is disposed between the upper polarizer and the lower polarizer.

[0013] In one of the embodiments, an OCA adhesive layer is further included, and the upper polarizer is bonded to the cover plate through the OCA adhesive layer.

[0014] In one embodiment, the display is an LCD liquid crystal display.

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

[0016] The utility model provides an anti-interference circuit board by setting an FPC, which includes a first side and a second side, wherein the first side is used to set a first routing structure of a sub-board, and the second side is used to set a second routing structure. The AGND end common ground pin of the first routing structure is electrically connected to the GND end common ground pin of the second routing structure at a single point. Compared with the prior art, the utility model has only one common ground terminal, which is different from the multiple common ground terminals of the prior art, thereby avoiding the AGND end of the sub-board and the GND end of the main screen having multiple common ground terminals on the FPC, preventing the sub-board and the main screen from interfering with each other, and solving the problem of display flickering caused by the charging USB of the sub-board interfering with the Mipi signal of the main screen. 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 This is a schematic diagram of the structure of an anti-interference circuit board in one embodiment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of a display module in an embodiment of the utility model.

[0020] Reference numerals:

[0021] FPC100 , first side A, second side B, AGND common ground pin 10 , GND common ground pin 11 , connector 12 , display module 200 , cover plate 20 . DETAILED DESCRIPTION

[0022] 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.

[0023] This application proposes an anti-interference circuit board, please refer to Figure 1 , including: FPC100, which includes a first side A and a second side B, the first side A is used to set the first routing structure of the sub-board, and the second side B is used to set the second routing structure of the main screen. The common ground pin 10 at the AGND end of the first routing structure is electrically connected to the common ground pin 11 at the GND end of the second routing structure at a single point, and the remaining positions are insulated and not electrically connected at a common point. Compared with the prior art, the utility model has only one common ground terminal. Different from the multiple common ground terminals in the prior art, it is avoided that the AGND end of the sub-board and the GND end of the main screen have multiple common ground terminals on FPC100, which prevents mutual interference between the sub-board and the main screen, and solves the problem that the charging USB of the sub-board interferes with the Mipi signal of the main screen and causes a flashing display.

[0024] It should be noted that the AGND common ground pin 10 of the first wiring structure is electrically connected to the GND end of the second wiring structure, that is, the main screen and the sub-board share a common ground at this point and are connected to the ground wire of the mobile phone motherboard. The mobile phone only has one ground.

[0025] In one embodiment, electronic components are also provided on FPC100, and the electronic components form a circuit with specific functions through a specific connection relationship. Furthermore, a steel plate is provided on the opposite side of FPC100 where the electronic components are provided. Since FPC100 is a soft circuit board, it is easy to bend or break when more electronic components are welded on FPC100. Therefore, a steel plate is provided on FPC100 to reinforce FPC100. Furthermore, FPC100 also includes a main connector end and a sub-connector end, the main connector end is provided at the lower end of FPC100, and the sub-connector end is provided at the upper end of FPC100. Further, FPC100 is in the shape of a "J", and FPC100 is bound to one side of the mobile phone and bent to the other side of the mobile phone to save space of the product and make the structure more compact.

[0026] Please refer again Figure 1 An anti-interference circuit board also includes a connector 12, the AGND end common ground pin 10 of the first routing structure is electrically connected to the GND end of the second routing structure, and the connector 12 is provided with pins which are respectively connected to the AGND end common ground pin 10 and the GND end common ground pin 11, and the two pins are connected in parallel.

[0027] The present application also proposes a display module 200, see Figure 2 , including the above-mentioned anti-interference circuit board, cover plate 20, display, backlight assembly and light source processing assembly. The display is used to display the picture, and the cover plate 20 is used to protect the display and provide touch. The backlight assembly provides lighting for the display. The light processing assembly processes the light emitted by the backlight assembly to change the emission path and uniformity of the light. A accommodating cavity is recessed in the backlight assembly to accommodate the light source, display, light processing assembly, etc. The light source processing assembly is arranged in the accommodating cavity, and the display is arranged in the light source processing assembly. FPC100 is electrically connected to the display to control the display to display a specific picture. The cover plate 20 covers the backlight assembly to enclose the accommodating cavity. An anti-interference circuit board is folded to the back of the cover plate 20 to reduce the size of the display module 200.

[0028] In one embodiment, the backlight assembly includes a light source assembly, and the light source assembly is an LED lamp. The spectrum of the LED lamp does not contain ultraviolet rays and infrared rays, and the waste can be recycled, there is no pollution, and it does not contain mercury elements, so the environmental benefits are better.

[0029] Furthermore, the light source processing assembly includes an upper polarizer and a lower polarizer, and the display is arranged between the upper polarizer and the lower polarizer. The upper polarizer and the lower polarizer are optical materials that can selectively pass light in a certain direction and block light in other directions, so that the image displayed by the display is more realistic and clear.

[0030] Furthermore, the display module 200 also includes an OCA adhesive layer, and the upper polarizer is bonded to the cover plate 20 through the OCA adhesive layer. The OCA adhesive layer is an optical adhesive that can reduce the light loss emitted by the LCD lamp, increase the brightness of the LCD lamp, provide high transmittance, and reduce energy consumption.

[0031] In addition, the display is an LCD liquid crystal display.

[0032] 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. An anti-interference circuit board, characterized in that: include: FPC, the FPC includes a first side and a second side, the first side is used to set the first routing structure of the sub-board, the second side is used to set the second routing structure of the main screen, an AGND common ground pin is set on the first routing structure, and a GND common ground pin is set on the second routing structure. The AGND common ground pin of the first routing structure is electrically connected to the GND common ground pin of the second routing structure at a single point.

2. The anti-interference circuit board according to claim 1, characterized in that: Electronic components are also arranged on the FPC.

3. The anti-interference circuit board according to claim 2, characterized in that: The FPC has a steel plate on a surface opposite to the surface on which the electronic components are provided.

4. The anti-interference circuit board according to claim 1, characterized in that: The FPC also includes a main connector end and a secondary connector end. The main connector end is arranged at the lower end of the FPC, and the secondary connector end is arranged at the upper end of the FPC.

5. The anti-interference circuit board according to claim 1, characterized in that: The FPC is in a "J" shape.

6. A display module, comprising an anti-interference circuit board according to any one of claims 1 to 5, characterized in that: Also includes a cover plate, a display, a backlight assembly and a light source processing assembly; The backlight assembly has a recessed accommodating cavity, the light source processing assembly is disposed in the accommodating cavity, the display is disposed in the light source processing assembly, the FPC is electrically connected to the display, and the cover plate covers the backlight assembly to enclose the accommodating cavity.

7. The display module according to claim 6, characterized in that: The backlight assembly includes a light source assembly, and the light source assembly is an LED lamp.

8. The display module according to claim 6, characterized in that: The light source processing assembly includes an upper polarizer and a lower polarizer, and the display is arranged between the upper polarizer and the lower polarizer.

9. The display module according to claim 8, characterized in that: It also includes an OCA adhesive layer, and the upper polarizer is bonded to the cover plate through the OCA adhesive layer.

10. The display module according to claim 6, characterized in that: The display is an LCD liquid crystal display.

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