Circuit board assembly, display device, and mobile terminal

Abstract

Disclosed are a circuit board assembly, a display device, and a mobile terminal. The circuit board assembly includes a housing, a metal sheet, a main board, and a sub-board. The housing has opposite first and second sides. The metal sheet is mounted to the first side, and a first end of the metal sheet has a first contact portion, and a second end of the metal sheet has a second contact portion. The first and second contact portions each pass through the housing and are disposed on the second side. The main board is mounted to the second side and electrically connected to the first contact portion, and the sub-board is mounted to the second side and electrically connected to the second contact portion. The circuit board assembly has the advantages of light weight and high stability of grounding reliability.

Description

Technical Field

[0001] This invention relates to the field of electronic equipment technology, and more particularly to circuit board assemblies, display devices, and mobile terminals. Background Technology

[0002] With the increasing performance demands of mobile devices, the circuit design of motherboards is becoming more and more complex. In addition to the motherboard, conventional smartphones usually have a sub-board, which also integrates various electronic components to meet different functional requirements.

[0003] Figure 6 The current display device includes a housing 01, a main board 02 and a sub-board 03 mounted on the back of the housing 01, and a display module 04 mounted on the front of the housing 01. The main board 02 and sub-board 03 require a spring contact 05 or conductive foam to connect with a large alloy structure 06 injection-molded into the housing 01 to complete the design of the radio frequency radiation reference ground and ground loop. Understandably, injection molding the alloy structure 06 into the housing 01 is costly and requires sophisticated processing. Furthermore, due to design tolerances in the structural components, there are risks to the reliability and stability of the radio frequency electrical performance grounding. After the alloy structure 06 is injection-molded into the housing 01, the housing 01 becomes heavier, resulting in a heavier mobile phone.

[0004] Figure 7 This is a schematic diagram showing the structure of the mainboard 02 and sub-board 03 installed on the back of the casing 01. After installation, the result is as follows: Figure 8 The front view shows the main board 02 and the sub-board 03 in contact with the alloy structure 06 via spring contacts 05. The alloy structure 06 has multiple mating parts 07 that contact the spring contacts. The spring contacts 05 pass through the through holes 08 in the housing 01 along the direction indicated by the dotted lines and mate with the corresponding mating parts 07. Typically, the contact parts 07 are laser-engraved to remove oxide layers, impurities, and other substances that affect conductivity from the surface of the contact parts 07 to ensure effective mating. The laser engraving process adds a step to the process.

[0005] Therefore, there is an urgent need for lightweight circuit board assemblies, display devices, and mobile terminals to overcome the above-mentioned shortcomings. Summary of the Invention

[0006] The purpose of this invention is to provide a lightweight circuit board assembly.

[0007] Another object of the present invention is to provide a lightweight display device.

[0008] Another object of the present invention is to provide a lightweight mobile terminal.

[0009] To achieve the above objectives, the present invention provides a circuit board assembly comprising a housing, a metal sheet, a main board, and a sub-board. The housing has a first side and a second side facing away from each other. The metal sheet is mounted on the first side, with a first contact portion at a first end and a second contact portion at a second end. The first and second contact portions each pass through the housing and are disposed on the second side. The main board is mounted on the second side and is electrically connected to the first contact portion. The sub-board is mounted on the second side and is electrically connected to the second contact portion.

[0010] Preferably, the metal sheet is attached to the first side, the first contact portion and / or the second contact portion has a bent structure, the ends of the first contact portion and / or the second contact portion form contact ends, and the contact ends are attached to the second side.

[0011] Preferably, the main board and the sub-board make electrical contact with their respective contact terminals through the first conductive element.

[0012] Preferably, the first contact portion and / or the second contact portion surround the housing.

[0013] Preferably, the main board and the sub-board are respectively located at the front and rear ends of the second side of the housing. The metal sheet is a strip-shaped sheet structure. The first end of the metal sheet extends laterally to form a first connecting part, and a first contact part is connected to the first connecting part. The second end of the metal sheet extends laterally to form a second connecting part, and a second contact part is connected to the second connecting part.

[0014] Preferably, the first connecting part and the second connecting part are attached to the first side.

[0015] Preferably, multiple through holes are provided at both the front and rear ends of the housing, and the first contact portion and the second contact portion pass through the corresponding through holes.

[0016] Preferably, the metal sheet includes two foil strips arranged on the left and right sides of the first side, and the foil strips extend in the front-back direction.

[0017] To achieve another objective mentioned above, the present invention provides a display device comprising a display module and the aforementioned circuit board assembly. The display module is mounted on a first side of the housing of the circuit board assembly, and the display module is electrically connected to a metal sheet via a second conductive element.

[0018] To achieve another objective mentioned above, the present invention provides a mobile terminal including the above-described display device.

[0019] Compared to existing technologies, the solution provided by this invention achieves the grounding effect of a reference ground and a complete circuit by using foil strips instead of large injection-molded alloy structures, eliminating the in-mold injection molding process of alloy structures and saving processing costs by more than 30%. The main board and sub-board make electrical contact with the foil strips via metal springs, while the display module makes electrical contact with the foil strips via conductive foam. In comparison, the foil strips do not require laser engraving, and their standardization and consistency are better, effectively reducing tolerances, ensuring the reliability and stability of grounding, and reducing the risk of inconsistent electrical performance of the mobile terminal. Because the casing is an all-plastic structure, reducing the alloy structure, the weight of the casing is reduced to approximately 50% of the original, effectively reducing the weight of the mobile terminal by 10%.

[0020] It is understood that, since the mobile terminal and display device of the present invention each include the above-mentioned circuit board assembly, the mobile terminal and display device are respectively lightweight, have high grounding reliability and stability, and optimize the manufacturing process. Attached Figure Description

[0021] Figure 1 This is a perspective view of the mobile terminal of the present invention.

[0022] Figure 2 This is a rear view structural diagram of the display device of the present invention.

[0023] Figure 3 It is along Figure 2 The sectional view obtained after cutting along line segment AA.

[0024] Figure 4 It is along Figure 2 A partial sectional view obtained after cutting the middle BB line segment.

[0025] Figure 5 This is a schematic diagram of the structure of the metal sheet of the present invention.

[0026] Figure 6 This is a schematic diagram of the structure of an existing display device.

[0027] Figure 7 This is a schematic diagram of the structure when the motherboard and sub-board are installed on the back of the casing.

[0028] Figure 8 This is a front view of the display device after the motherboard and sub-board have been installed on the back of the casing. Detailed Implementation

[0029] To illustrate the technical content and structural features of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0030] like Figure 1As shown, the present invention provides a mobile terminal 1000, including but not limited to mobile phones, tablet computers, etc. The mobile terminal 1000 includes a display device 100 and a battery, and of course, other structures, which are not listed in detail here. The battery provides power to the display device 100, and the display device 100 provides information such as text, images, animations, and videos.

[0031] like Figures 2 to 4 As shown, the display device 100 of the present invention includes a circuit board assembly 10 and a display module 20. Specifically, the display module 20 is an LCM, that is, a liquid crystal display module, or more specifically, a touch screen, which can input commands by pressing, swiping, etc. Of course, the display module 20 can also be used as a non-touch screen.

[0032] The circuit board assembly 10 includes a housing 11, a metal plate 12, a main board 13, and a sub-board 14. The housing 11 has space for accommodating the main board 13, the sub-board 14, and the display module 20, all housed within this space. The housing 11 has a first side and a second side facing away from each other. The metal plate 12 is mounted on the first side, with a first contact portion 121 at its first end and a second contact portion 122 at its second end. The first contact portion 121 and the second contact portion 122 each pass through the housing 11 and are located on the second side. The main board 13 is mounted on the second side and electrically connected to the first contact portion 121, and the sub-board 14 is mounted on the second side and electrically connected to the second contact portion 122. Using the metal plate 12 as a reference ground, and after the main board 13 is electrically connected to the first contact portion 121 and the sub-board 14 is electrically connected to the second contact portion 122, the metal plate 12 effectively connects the main board 13 and the sub-board 14 into a complete circuit.

[0033] Compared to the prior art described in the background section of this invention, this invention utilizes a metal sheet 12 to replace the bulk alloy structure injected into the mold, eliminating the need for the injection molding process. Furthermore, the metal sheet 12 is easy to install. Therefore, adopting the solution of this invention can effectively reduce production difficulty, save production time, and lower production costs. The bulk alloy structure is heavy, while the metal sheet 12 is lightweight, significantly reducing the weight of the casing 11, thus lightening the weight of the phone and facilitating its structural design, as well as effectively reducing the burden of holding the phone. Moreover, compared to the injection-molded alloy structure, the external metal sheet 12 design makes it easier to control tolerances and reduces the risk to the reliability and stability of radio frequency electrical performance grounding.

[0034] It should be noted that the housing 11 includes a front housing and a middle frame. While the housing 11 is shown as a whole in the accompanying drawings, it should be understood as a separate structure. The display module 20 is mounted on the front housing, while the main board 13 and sub-board 14 are mounted on the middle frame. The structure of the front housing and middle frame is prior art.

[0035] like Figures 2 to 5As shown, the metal sheet 12 is attached to the first side. The metal sheet 12 is a sheet material and is attached to the first side, so it does not occupy space after installation, and other structures can be installed in the original manner. The first contact portion 121 and the second contact portion 122 are bent structures, and the ends of the first contact portion 121 and the second contact portion 122 form contact ends 123, which are attached to the second side. The contact ends 123 installed in this attachment method also do not occupy space. Before installation, the first contact portion 121 and the second contact portion 122 are straight sheets, which are bent after passing through the housing 11. Furthermore, the first contact portion 121 and the second contact portion 122 wrap around the housing 11, increasing the stability of the installation.

[0036] like Figure 1 As shown, the main board 13 and the sub-board 14 are respectively located at the front and rear ends of the second side of the housing 11, and the metal sheet 12 is a long strip-shaped sheet structure. A first connecting portion 124 extends laterally from the first end of the metal sheet 12, and a first contact portion 121 is connected to the first connecting portion 124. A second connecting portion 125 extends laterally from the second end of the metal sheet 12, and a second contact portion 122 is connected to the second connecting portion 125. The first connecting portion 124 and the second connecting portion 125 utilize the lateral space to arrange multiple first contact portions 121 and second contact portions 122. Preferably, the first connecting portion 124 and the second connecting portion 125 are mounted on the first side without occupying outward space. The lateral direction mentioned above refers to the left-right direction.

[0037] It should be pointed out that, Figure 2 The direction indicated by the middle arrow X is left and right, and the direction indicated by the arrow Y is front and back.

[0038] like Figure 3 As shown, the front and rear ends of the housing 11 each have multiple through holes 111, through which the first contact portion 121 and the second contact portion 122 pass. The through holes 111 facilitate the passage of the first contact portion 121 and the second contact portion 122 through the housing 11. The housing 11 is made of plastic, and the through holes 111 can be formed simultaneously during injection molding, or they can be formed subsequently through processing. The housing 11 is made of plastic and is lightweight. The housing 11 can also be made of ceramic or alloy, etc. Preferably, the front end of the housing 11 has five through holes 111 for five first contact portions 121 to pass through, arranged in two rows, one row with three holes and the other row with two holes. The rear end of the housing 11 has three through holes 111 arranged in a row for three second contact portions 122 to pass through.

[0039] like Figures 2 to 5As shown, the metal sheet 12 includes two foil strips 126, arranged side-by-side on the first side, extending in the front-back direction. The foil strips 126 are thin and lightweight, occupying almost no space and not affecting the arrangement of other structures. Each foil strip 126 has a standardized design, reducing the impact of design tolerances. The foil strips 126 contain very few impurities and have low oxidation levels, ensuring effective connection without laser engraving, thus guaranteeing the reliability and stability of grounding. The foil strips 126 can be made of copper or aluminum foil, and their width can be designed according to actual needs. To visually demonstrate the technical solution of this invention, [details omitted]. Figure 3 and Figure 4 The foil strip 126 in the diagram is shown to be thickened, but it should be understood that the thickness of the foil strip 126 should be very thin.

[0040] Both the main board 13 and the secondary board 14 are PCBs; in this field, the secondary board 14 is also referred to as a small board. Depending on the actual needs, the main board 13 and / or the secondary board 14 can also be used as flexible circuit boards, i.e., FPCs. It is worth noting that the main board 13 has an RF chip installed, and the secondary board 14 has an antenna and some plug-ins (such as USB, headphone, etc.). Both the main board 13 and the secondary board 14 have RF antennas, and both need to radiate back to the main ground.

[0041] like Figure 3 and Figure 4 As shown, the main board 13 and the sub-board 14 are electrically connected to their respective contact ends 123 via the first conductive element 15, achieving conductivity between the main board 13 and the first contact portion 121, and between the sub-board 14 and the second contact portion 122, ensuring reliable and stable contact. Preferably, the first conductive element 15 is a metal spring, but it is not limited to this. The display module 20 is electrically connected to the metal sheet 12 via the second conductive element 16. Preferably, the second conductive element 16 is conductive foam, but it is not limited to this. Specifically, the display module 20 has a metal frame, and the conductive foam is electrically connected to the metal frame. Static electricity from the display module 20 is conducted to the foil strip 126 via the conductive foam, achieving grounding and preventing electrostatic interference.

[0042] Compared with existing technologies, the solution provided by this invention achieves the grounding effect of reference ground and complete circuit by using foil strip 126 instead of a large injection-molded alloy structure, eliminating the in-mold injection molding process of alloy structure and saving processing costs by more than 30%. The main board 13 and sub-board 14 are electrically connected to the foil strip 126 via metal springs, and the display module 20 is electrically connected to the foil strip 126 via conductive foam. In comparison, the foil strip 126 does not require laser engraving, and its standardization is better, effectively reducing tolerances, ensuring the reliability and stability of grounding, and reducing the risk of inconsistent electrical performance of the mobile terminal 1000. Since the housing 11 is an all-plastic structure, reducing the alloy structure, the weight of the housing 11 is reduced to approximately 50% of its original weight, effectively reducing the weight of the mobile terminal 1000 by 10%.

[0043] The above-disclosed examples are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are within the scope of the present invention.

Claims

1. A circuit board assembly, characterized in that, include: The housing has a first side and a second side facing away from each other; A metal sheet is attached to the first side. The first end of the metal sheet has a first contact portion, and the second end of the metal sheet has a second contact portion. The first contact portion and the second contact portion each pass through the housing and are disposed on the second side. The motherboard is mounted on the second side and is electrically connected to the first contact portion; The sub-plate is mounted on the second side and is electrically connected to the second contact portion.

2. The circuit board assembly according to claim 1, characterized in that, The first contact portion and / or the second contact portion are bent structures, and the ends of the first contact portion and / or the second contact portion form contact ends, which are attached to the second side.

3. The circuit board assembly according to claim 2, characterized in that, The main board and the sub-board are electrically connected to their respective contact terminals via a first conductive element.

4. The circuit board assembly according to claim 1, characterized in that, The first contact portion and / or the second contact portion surround the housing.

5. The circuit board assembly according to claim 1, characterized in that, The main board and the sub-board are respectively located at the front and rear ends of the second side of the housing. The metal sheet is a strip-shaped sheet structure. The first end of the metal sheet extends laterally to form a first connecting part, and the first contact part is connected to the first connecting part. The second end of the metal sheet extends laterally to form a second connecting part, and the second contact part is connected to the second connecting part.

6. The circuit board assembly according to claim 5, characterized in that, The first connecting part and the second connecting part are attached to the first side.

7. The circuit board assembly according to claim 1, characterized in that, The housing has multiple through holes at both the front and rear ends, and the first contact portion and the second contact portion pass through the corresponding through holes.

8. The circuit board assembly according to claim 1, characterized in that, The metal sheet includes two foil strips, which are arranged on the first side in a left-right configuration and extend in a front-back direction.

9. A display device, characterized in that, The device includes a display module and a circuit board assembly as described in any one of claims 1-8, wherein the display module is mounted on a first side of the housing of the circuit board assembly, and the display module is electrically connected to the metal sheet via a second conductive element.

10. A mobile terminal, characterized in that, Includes the display device as described in claim 9.

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