FPC (Flexible Printed Circuit) flat cable device and electronic equipment

Abstract

The embodiment of the utility model discloses an FPC (Flexible Printed Circuit) flat cable device and electronic equipment, the FPC flat cable device can comprise a flat cable main body and a plurality of conductive shielding films, the flat cable main body comprises a flat cable board and at least one group of flat cable units arranged on the flat cable board, each group of flat cable units comprises at least one signal line and at least two grounding lines, and the conductive shielding films are arranged between the signal lines and the grounding lines. The signal line is located between the at least two grounding lines, the at least two grounding lines are provided with a plurality of groups of connecting parts, and each group of connecting parts comprises two connecting parts which are respectively arranged on the two grounding lines; each conductive shielding film covers at least one group of connecting parts, so that the two grounding wires corresponding to each group of connecting parts are electrically connected, and the plurality of conductive shielding films are arranged at intervals.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of radiation shielding, and particularly to an FPC cable assembly and an electronic device. Background Art

[0002] With the rapid development of electronic technology, FPC (Flexible Printed Circuit) cables have been widely used in modern electronic products, such as smartphones, tablets, wearable devices, etc., due to their characteristics of being bendable, thin, and capable of achieving three-dimensional space wiring. The FPC cable provides electrical connections, enabling the various components in the electronic device to communicate and cooperate with each other.

[0003] However, the existing FPC cable designs face many challenges. First, when the FPC cable transmits high-frequency signals, due to the lack of effective shielding measures, electromagnetic interference (EMI) is easily generated, affecting the signal integrity and device stability. Summary of the Utility Model

[0004] In view of this, embodiments of the present disclosure are expected to provide an FPC cable assembly and an electronic device, which can solve the electromagnetic radiation problem caused by the FPC cable in the prior art during high-frequency signal transmission.

[0005] The technical solution of the embodiments of the present disclosure is implemented as follows:

[0006] In a first aspect, embodiments of the present disclosure provide an FPC cable assembly, including:

[0007] A cable main body, the cable main body includes a cable board and at least one set of cable units disposed on the cable board, the cable unit includes at least one signal line and at least two ground lines, the signal line is located between the at least two ground lines, and multiple sets of connection parts are disposed on the at least two ground lines, and each set of connection parts includes two connection parts respectively disposed on the two ground lines;

[0008] Multiple conductive shielding films, each of the conductive shielding films covers at least one set of the connection parts, so that the two ground lines corresponding to each set of connection parts are electrically connected, and the multiple conductive shielding films are spaced apart.

[0009] In some examples, the distance between the two connection parts in each set of connection parts in the extending direction of the ground line is less than a preset threshold.

[0010] In some examples, each of the conductive shielding films covers the set of connection parts and the signal line between the connection parts.

[0011] In some examples, the connecting portion includes a grounding hole disposed in a direction perpendicular to the flexible cable board, and multiple groups of grounding holes are provided on the two ground wires;

[0012] Adjacent two groups of the grounding holes are spaced apart in the extending direction of the ground wire, and the spacing distance is positively correlated with the aperture of the grounding hole.

[0013] In some examples, the flexible cable unit includes multiple signal lines, and the ground wires are disposed on both sides of each of the signal lines.

[0014] In some examples, the flexible cable unit includes multiple signal lines and two ground wires, and the multiple signal lines are located between the two ground wires.

[0015] In some examples, the ground wire includes at least one connecting portion set in a direction perpendicular to the bottom plate, and the connecting portion set includes two sets of connecting portions disposed oppositely.

[0016] In some examples, the flexible cable device further includes:

[0017] An absorbing layer, covering the flexible cable main body, and the absorbing layer includes an absorbing material.

[0018] In a second aspect, an embodiment of the present disclosure provides an electronic device, which includes a main board and a display device, and the main board is connected to the display device through the flexible cable device described in the first aspect.

[0019] The embodiment of the present disclosure provides an FPC flexible cable device and an electronic device; by providing a conductive shielding film between the ground wires on both sides of the signal line, external electromagnetic interference can be effectively shielded, noise and interference during signal transmission can be reduced, thereby improving signal integrity and the electromagnetic compatibility of the device. The design of the flexible cable unit enables the signal lines to be surrounded by the ground wires, forming a shielding structure, which helps to reduce crosstalk and attenuation during signal transmission, thereby optimizing the signal transmission quality. The multiple conductive shielding films are spaced apart, which can reduce the process cost and help improve the bending resistance and tensile resistance of the FPC flexible cable. This structural design enables the FPC flexible cable to still maintain good electrical connection after multiple bends and insertions and removals, enhancing its reliability in actual use. By directly providing a connecting portion on the ground wire and covering a conductive shielding film thereon, the production and assembly processes of the FPC flexible cable are simplified, which helps to improve production efficiency and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of an FPC flexible cable device provided by an embodiment of the present disclosure.

[0021] Figure 2 It is a schematic structural diagram of a ground wire provided by an embodiment of the present disclosure.

[0022] Figure 3 This is a schematic structural diagram of another FPC flexible cable device provided by an embodiment of the present disclosure.

[0023] Figure 4 This is a schematic structural diagram of yet another FPC flexible cable device provided by an embodiment of the present disclosure.

[0024] Figure 5 This is a schematic structural diagram of another FPC flexible cable device provided by an embodiment of the present disclosure.

[0025] Figure 6 This is a schematic structural diagram of yet another FPC flexible cable device provided by an embodiment of the present disclosure.

[0026] Figure 7 This is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure.

[0027] Through the above-mentioned drawings, specific embodiments of the present disclosure have been shown, and more detailed descriptions will be given hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concept of the present disclosure to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0028] Now, example embodiments will be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present disclosure will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0029] In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0030] In modern car design, HUD (Head-Up Display) technology is gaining more and more attention because it can enhance the safety and comfort of drivers. The HUD system projects key information directly onto the windshield, allowing drivers to obtain information without having to look down at the dashboard, thereby reducing distraction. As one of the key components in the HUD, the FPC (Flexible Printed Circuit) wiring design between the LCD screen and the HUD control motherboard is crucial.

[0031] The existing LCD screen cable design usually uses a double-layer PCB board, with the top layer responsible for signal lines and the bottom layer as the ground line (GND) to control the impedance of the differential signal. However, this design does not effectively shield the cable, resulting in failure in the 200MHz to 1GHz radiation emission test. Worse, unshielded cables may generate interference signals, which may not only cause the HUD product to fail to meet the EMC requirements of the vehicle manufacturer, but also interfere with the normal operation of other ECU components in the car.

[0032] In response to these shortcomings of the existing technology, the industry has tried to take some improvement measures, such as using thermal insulation tape and conductive cloth to shield and wrap the FPC cable. Although this method can reduce interference to a certain extent, its process is cumbersome, difficult to implement, and significantly increases product costs. Therefore, how to design an FPC cable that can effectively shield electromagnetic interference, simplify the production process, and reduce costs has become a technical problem that needs to be solved in the HUD manufacturing field.

[0033] Based on the above technical problems, the present disclosure proposes a new type of FPC cable arrangement device. Figure 1 The wiring device may include a wiring main body 1 and a plurality of conductive shielding films 3, wherein the wiring main body includes a wiring board 11 and at least one group of wiring units 12 arranged on the wiring board 11, each group of wiring units 12 includes at least one signal line 122 and at least two grounding lines 121, the signal line 122 is located between the at least two grounding lines 121, and a plurality of connecting parts 2 are arranged on the at least two grounding lines 121, and each group of connecting parts 2 includes two connecting parts 2 respectively arranged on the two grounding lines 121; each conductive shielding film 3 covers at least one group of connecting parts 2, so that the two grounding lines 121 corresponding to each group of connecting parts 2 are electrically connected, and the plurality of conductive shielding films 3 are arranged at intervals.

[0034] This FPC cable assembly effectively improves electromagnetic compatibility (EMC) by arranging at least two ground wires 121 on both sides of the signal wire 122 and setting multiple sets of connecting parts 2 on the ground wires 121. Each set of connecting parts 2 includes two connecting parts 2 respectively arranged on two ground wires 121. By setting exposed copper grounding points at specific positions on the front and back of the FPC cable and adopting the electromagnetic shielding film spraying technology, the overall shielding effect is enhanced, interference during signal transmission is reduced, thereby improving signal integrity and the stability of the device.

[0035] Secondly, by covering each set of connecting parts 2 with the conductive shielding film 3, the corresponding two ground wires 121 are electrically connected. This design not only optimizes the signal transmission quality but also helps reduce crosstalk and attenuation during signal transmission. Such shielding measures are particularly important for high-speed or high-frequency signals, ensuring the high-speed and accuracy of data transmission and meeting the high requirements of modern electronic products for data transmission quality.

[0036] In addition, this design also improves the mechanical stability of the FPC cable. The conductive shielding films 3 are arranged at intervals, providing additional mechanical support for the cable, which helps improve the bending and pulling resistance of the FPC cable. This structural design enables the FPC cable to still maintain good electrical connection after multiple bends and insertions and removals, enhancing its reliability in actual use.

[0037] Meanwhile, the design of this FPC cable assembly simplifies the production process. By directly setting the connecting parts 2 on the ground wires 121 and covering them with the conductive shielding film 3, the complex process of multiple layers of wrapping is omitted, simplifying the production process. This not only helps reduce manufacturing costs but also improves production efficiency, enabling the product to enter the market faster.

[0038] Finally, this design also enhances the aesthetics of the product. Due to the simplification of the process, the appearance of the FPC cable is cleaner and smoother, which helps improve the overall aesthetics of the final product.

[0039] In some examples, referring to Figure 1 , the cable board 11 is used to fix the above-mentioned cable unit 12. At least one cable unit 12 is fixed on the cable board 11. The cable unit 12 includes at least one signal wire 122 and at least two ground wires 121. Among them, the signal wire 122 can include data information wires, clock signal wires 122, etc. Among them, the data signal wire 122 is used to transmit display data, and the clock signal wire 122 is used to transmit clock signals.

[0040] The flexible cable unit 12 is located between two ground wires 121 so that the ground wires 121 can shield the flexible cable unit 12. Multiple sets of connecting parts 2 can be arranged on the ground wires 121. Each set of connecting parts 2 includes two connecting parts 2 respectively arranged on the two ground wires 121.

[0041] It should be noted that both the signal wire 122 and the ground wire 121 include an external insulating material and an internal conductive material. The specific materials of the external insulating material and the conductive material can be customized according to user requirements and will not be elaborated in this exemplary embodiment. For example, the external insulating material can be plastic, rubber, etc., and the conductive material can be copper, aluminum, etc.

[0042] In some examples, referring to Figure 2 , the above-mentioned connecting part 2 can be a through hole opened in the insulating material 1211 of the ground wire 121 to expose the conductive material 1212 in the ground wire 121, that is, the connecting part 2 can be a grounding hole. The connecting part 2 can also be a wire directly led out from the ground wire 121, which will not be elaborated in this exemplary embodiment.

[0043] In some examples, referring to Figure 3 , the above-mentioned conductive shielding film 3 can be sprayed onto the flexible cable main body. Each conductive shielding film 3 covers at least one set of the above-mentioned connecting parts 2 so that the two connecting parts 2 corresponding to each set of connecting parts 2 are electrically connected, and the multiple conductive shielding films 3 are arranged at intervals. For example, each conductive shielding film 3 can cover one set, two sets or more sets of the above-mentioned conductive shielding films 3, which will not be elaborated in this exemplary embodiment.

[0044] Optionally, referring to Figure 4 , each conductive shielding film 3 can cover one set of connecting parts 2 and the signal wire 122 between the connecting parts 2. Covering the connecting parts 2 can connect the two ground wires corresponding to one set of connecting parts 2, and covering the signal wire 122 in between can ground the signal wire 122.

[0045] In one exemplary embodiment, referring to Figure 5 , in the direction perpendicular to the bottom plate, the ground wire 121 includes at least one set of connecting part sets. One set of connecting part sets (such as the area boxed by the dotted line in Figure 5 ) includes two sets of connecting parts 2 arranged oppositely. When the conductive shielding film 3 covers both sets of connecting parts 2, the conductive shielding film 3 is equivalent to grounding, and together with the two ground wires, it wraps the signal wire 122, which can achieve a good shielding effect on the signal wire 122.

[0046] In some examples, referring to Figure 2, the distance between two connecting parts 2 on each group of connecting parts 2 in the extending direction of the ground wire 121 is less than a preset threshold value. The preset threshold value can be 1 mm, 1.5 mm, etc., or a smaller distance, and can also be set according to the length of the circuit in the FPC cable device, which will not be elaborated in this exemplary embodiment.

[0047] In some examples, referring to Figure 6 , when the above-mentioned connecting part 2 is a grounding hole, adjacent two groups of grounding holes are arranged at intervals in the extending direction of the ground wire 121, and the interval distance can be positively correlated with the aperture of the grounding hole. Optionally, the cross-section of the grounding hole can be circular, triangular, rectangular, etc., which will not be elaborated in this exemplary embodiment.

[0048] In some examples, the aperture can be the maximum distance between the hole walls of the above-mentioned grounding hole. Optionally, the above-mentioned aperture and the interval distance can be linearly positively correlated. For example, the interval distance can be ten times, fifteen times, etc. of the aperture, or non-linearly positively correlated. For example, the density of the grounding holes near the signal output end and the input end of the signal line 122 is greater than the density of the grounding holes in the middle section. The density of the grounding holes refers to the number of grounding holes on the ground wire 121 within a preset distance.

[0049] In some examples, the cable arrangement 1 may further include an absorbing layer, wherein the absorbing layer covers the cable main body, and the absorbing layer includes an absorbing material. The absorbing material may include resistive loss materials, dielectric loss materials, magnetic dielectric loss materials, etc., which will not be elaborated in this exemplary embodiment.

[0050] In some examples, the distance between at least one group of connecting parts 2 and the signal input end of the above-mentioned signal line 122 is less than a set distance. The set distance can be 5 mm, 2 mm, etc., and can also be customized according to user requirements, which will not be elaborated in this exemplary embodiment.

[0051] By providing multiple groups of connecting parts 2 on the ground wire 121 and covering the connecting parts 2 with the conductive shielding film 3, the electromagnetic compatibility is effectively improved and the stability of signal transmission is enhanced. In addition, by precisely controlling the interval and aperture of the grounding holes, and the distance between the ground wire 121 and the signal input end of the signal line 122, the signal reflection and attenuation are further reduced, ensuring the integrity of the signal. The cable arrangement also adopts an absorbing layer made of an absorbing material to absorb the excess electromagnetic waves and reduce interference. This FPC cable arrangement not only improves the mechanical stability, but also, due to the flexibility of its structure and the diversity of its design, can meet the requirements of different electronic devices. For example, in the connection application between the main board 4 and the display device 5 of an electronic device, its wide applicability and practicality are demonstrated.

[0052] Furthermore, referring to Figure 7, the present disclosure also provides an electronic device, which includes a main board 4 and a display device 5. Among them, the main board 4 and the display device 5 are connected through the above-mentioned cable device.

[0053] It should be noted that the specific structure of the cable device has been described in detail above, so it will not be elaborated here.

[0054] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0055] Those skilled in the art will readily think of other implementation manners of the present disclosure after considering the specification and practicing the utility model applied here. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include the common general knowledge or conventional technical means in the technical field not claimed in the present disclosure.

[0056] It should be understood that the present disclosure is not limited to the exact structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. An FPC cable arrangement device, characterized in that: include: A cable body, the cable body comprising a cable board and at least one set of cable units arranged on the cable board, the cable unit comprising at least one signal line and at least two grounding lines, the signal line is located between the at least two grounding lines, and the at least two grounding lines are provided with a plurality of groups of connecting parts, each group of connecting parts comprising two connecting parts respectively arranged on the two grounding lines; A plurality of conductive shielding films, each of which covers at least one group of the connecting parts, so that two grounding wires corresponding to each group of the connecting parts are electrically connected, and the plurality of conductive shielding films are arranged at intervals.

2. The cable arrangement device according to claim 1, characterized in that: A distance between two connection portions in each group of connection portions in a direction in which the ground line extends is smaller than a preset threshold.

3. The cable arrangement device according to claim 1, characterized in that: Each of the conductive shielding films covers the group of connecting parts and the signal lines between the connecting parts.

4. The cable arrangement device according to claim 1, characterized in that: The connecting portion includes a grounding hole arranged in a direction perpendicular to the wiring board, and the two grounding wires are provided with multiple groups of grounding holes; Two adjacent groups of grounding holes are spaced apart in the extending direction of the grounding wire, and the spacing distance is positively correlated with the aperture of the grounding hole.

5. The cable arrangement device according to claim 1, characterized in that: The wiring unit includes a plurality of signal lines, and the grounding lines are arranged on both sides of each of the signal lines.

6. The cable arrangement device according to claim 1, characterized in that: The wiring unit includes a plurality of signal lines and two ground lines, and the plurality of signal lines are located between the two ground lines.

7. The cable arrangement device according to claim 1, characterized in that: The grounding line includes at least one connection portion set in a direction perpendicular to the bottom plate, and the connection portion set includes two groups of connection portions arranged opposite to each other.

8. The cable arrangement device according to claim 1, characterized in that: The wiring device further comprises: The wave absorbing layer covers the cable body, and the wave absorbing layer includes a wave absorbing material.

9. The cable arrangement device according to claim 1, characterized in that: The distance between at least one group of the connecting parts and the signal input end of the signal line is smaller than a set distance.

10. An electronic device, characterized in that: The electronic device comprises a mainboard and a display device; The mainboard is connected to the display device via the wiring device described in any one of claims 1-9.

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