CN108601201B - Flexible circuit boards and electronic devices - Google Patents

Abstract

The embodiment of the present application discloses a flexible circuit board and an electronic device, wherein the flexible circuit board comprises: a flexible circuit board body, a board-to-board connector BTB and at least one copper-exposed area; wherein the at least one copper-exposed area comprises: at least one grounding through hole, and the flexible circuit board body is grounded through the at least one grounding through hole. The technical solution provided by the present application has the advantages of anti-interference and improving user experience.

Description

Flexible circuit boards and electronic devices

technical field

The present application relates to the technical field of mobile terminals, and in particular, to a flexible circuit board and an electronic device.

Background technique

With the widespread application of wireless communication devices such as smart phones, smart phones can support more and more applications and more powerful functions. Smart phones are developing in the direction of diversification and personalization. Antennas and displays belong to smart phones A must-have product, the antenna has its own signal and frequency. Due to the limited space of the smartphone and the limited distance between the display screen and the antenna, the frequency of the display screen will interfere with the antenna, affecting the user's use and reducing the user experience.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a flexible circuit board and an electronic device, so as to reduce the interference of the display screen to the antenna and improve the user experience.

In a first aspect, an embodiment of the present application provides a flexible circuit board, the flexible circuit board includes: a flexible circuit board body, a board-to-board connector BTB, and at least one exposed copper area; wherein,

The at least one exposed copper area includes: at least one grounding through hole, and the flexible circuit board body is grounded through the at least one grounding through hole.

Optionally, the at least one exposed copper area is provided on one side of the BTB of the flexible circuit board body or on the other side of the flexible circuit board locally close to the main board.

Optionally, the at least one ground via is a plurality of ground vias.

Optionally, the distance between two adjacent grounding vias in the plurality of grounding vias is equal.

Optionally, the flexible circuit board further includes: a filter circuit,

One end of the filter circuit is connected to the ground through hole, and the other end of the filter circuit is connected to the ground.

Optionally, the filter circuit includes: a capacitor or an inductor.

Optionally, the filter circuit includes: a selection switch, a first capacitor, and a first inductor, wherein a common terminal of the selection switch is connected to the ground via, and two selection terminals of the selection switch are respectively connected to the One end of the first capacitor and one end of the first inductor, and the other end of the first capacitor and the other end of the first inductor are grounded.

Optionally, the at least one exposed copper area includes a plurality of exposed copper areas, and the multiple exposed copper areas are disposed on one side of the BTB of the flexible circuit board body and are disposed locally on the flexible circuit board near the main board. on the other side;

The flexible circuit board further includes: a first filter circuit and a second filter circuit;

One end of the first filter circuit is connected to the ground via in the exposed copper area on the other side, and the other end of the first filter circuit is grounded;

One end of the second filter circuit is connected to the ground via in the exposed copper area on one side of the BTB, and the other end of the second filter circuit is grounded.

Optionally, the first filter circuit is an inductor, and the second filter circuit is a capacitor.

In a second aspect, an electronic device is provided, the electronic device includes: a casing, a main board, and a display screen, wherein the electronic device further includes the flexible circuit board provided in the first aspect, and the main board passes through the flexible circuit The board is connected to the display screen.

It can be seen that, in the embodiment of the present application, in this embodiment, at least one exposed copper area is set in the FPC of the electronic device, and a grounding through hole is set in the exposed copper area, and then the grounding through hole is used for grounding, which improves the grounding reliability of the FPC , grounding is an effective way to reduce the noise amplitude. Higher grounding reliability can effectively reduce the interference of the display screen to the antenna.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a flexible circuit board.

FIG. 2a is a schematic structural diagram of an electronic device.

FIG. 2b is a schematic structural diagram of the flexible circuit board of the present application.

FIG. 3 a is a schematic structural diagram of a filter circuit of the present application.

FIG. 3b is a schematic structural diagram of another filter circuit of the present application.

FIG. 3c is a schematic structural diagram of another filter circuit of the present application.

FIG. 4 is a schematic structural diagram of a mobile phone according to the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

The terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

The electronic devices involved in the embodiments of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to wireless modems, as well as various forms of user equipment (User Equipment). Equipment, UE), mobile station (Mobile Station, MS), terminal device (terminal device) and so on. Of course, in other applications, the above-mentioned wireless communication device may also be a network-side device, such as a base station, an access point and other network-side devices. For convenience of description, the devices mentioned above are collectively referred to as wireless communication devices.

Referring to FIG. 1, FIG. 1 is a flexible circuit board. As shown in FIG. 1, the flexible circuit board includes: an FPC body 120, an interface 121 and an ear 122, the ear 122 is arranged at the edge of the FPC, and the ear 122 includes exposed copper area through which the exposed copper area is grounded.

The flexible circuit board structure shown in FIG. 1 is provided with ears 122 and the ears 122 extend out of the FPC body. This structure will cause the FPC to warp, resulting in poor grounding and scratching of the battery, and the grounding structure is reliable. Low, lower reliability leads to its lower anti-interference ability.

Please refer to FIG. 2a. FIG. 2a is a schematic structural diagram of an electronic device 100 provided by an embodiment of the present application. The electronic device 100 includes: a display screen 103, a flexible circuit board FPC101, a main board 102, and a housing 110, wherein the main board 102 And the flexible circuit board 101 is arranged inside the casing 110, the display screen 103 is connected to the main board 102 through the FPC 101, wherein the FPC 101 as shown in FIG. 2b includes: at least one exposed copper area 1011, and each exposed copper area 1011 includes at least one ground Through hole 108, the FPC 101 is grounded through the grounding through hole.

The electronic device provided by the technical solution of the present application is provided with at least one exposed copper area in the FPC, and a grounding through hole is arranged in the exposed copper area, and then grounded through the grounding through hole, which improves the grounding reliability of the FPC, and grounding is an effective way to reduce scheme of noise magnitude. Higher grounding reliability can effectively reduce the interference of the display screen to the antenna.

Optionally, each exposed copper region 1011 may include a plurality of ground vias, and each ground via is grounded.

Optionally, the distances between the multiple grounding vias may be uniformly arranged, and the uniformly arranged multiple grounding vias can reduce the path difference of the grounding lines of the multiple lines, thereby reducing the circulating current between different grounding lines. , improve the grounding effect and improve the effect of noise filtering.

Optionally, the at least one exposed copper area 1011 is disposed on a side close to the BTB (English: Board-to-Board Connectors). Setting the at least one exposed copper area 1011 on the side close to the BTB can make the noise signal filter before entering the display screen through the BTB, which has the advantage of effectively filtering the noise signal.

Optionally, the above-mentioned at least one exposed copper area 1011 is disposed close to the other side of the motherboard. Disposing the exposed copper area 1011 on the other side close to the mainboard can make the noise signal output from the mainboard to be filtered, which can effectively filter the noise of the signal output by the mainboard and improve the filtering effect.

Optionally, the at least one grounding via of each exposed copper area 1011 is connected to one end of the filter circuit, and the other end of the filter circuit is grounded. As shown in FIG. 3a, the filter circuit may specifically include: a first capacitor C1; One end of a capacitor C1 is connected to the ground via, and the other end of the first capacitor C1 is grounded. This filter circuit mainly filters the grounded low-frequency noise through the capacitor.

Optionally, as shown in FIG. 3b, the above-mentioned filter circuit may further include: a selection switch, a second capacitor C2, and a first inductor L1, wherein the common terminal of the selection switch is connected to the ground via, and the two selection switches of the selection switch The terminals are respectively connected to one end of the second capacitor C2 and one end of the first inductor L1, and the other end of the second capacitor C2 and the other end of the first inductor L1 are grounded. The above-mentioned selector switch may specifically be a single-pole double-throw switch. Of course, in practical applications, it may also be other selector switches. The specific embodiments of the present application do not limit the specific structure of the above-mentioned switches. This structure can filter both high-frequency noise and low-frequency noise, wherein the inductor L1 filters the high-frequency noise, and the capacitor C2 filters the low-frequency noise, thereby achieving the effect of improving noise filtering.

Optionally, the above-mentioned exposed copper areas 1011 may be multiple, and the multiple exposed copper areas 1011 may be arranged on one side close to the BTB and the other side close to the main board; when the other side close to the main board and the side close to the BTB are both When there is an exposed copper area, the exposed copper area on the other side close to the motherboard and the side close to the BTB can effectively improve the noise filtering effect and improve the user experience, because when the noise signal is transmitted through the FPC, There will be interference at the input and output, so set bare copper areas and ground vias on both sides to ground, which can effectively suppress noise and improve the filtering effect.

Optionally, as shown in FIG. 3c , the first grounding through hole of the exposed copper area on the other side of the main board is grounded through a high-frequency filter circuit, and the high-frequency filter circuit may be an inductor. Specifically, one end of the inductor is The first ground via is connected, and the other end of the inductor is grounded. Correspondingly, the second ground via in the exposed copper area close to the side of the BTB is grounded through a low-frequency filter circuit, which may specifically be a capacitor. Here, configuring low-frequency and high-frequency filter circuits on two different sides can improve the filtering effect. For high-frequency noise, it is found through experiments that more of it is generated on the motherboard side, so high-frequency filtering is set on the other side close to the motherboard. However, setting a low-frequency filter circuit in the BTB can more effectively improve the filtering of low-frequency noise, thereby improving the filtering effect, so it has the advantages of improving the filtering effect and improving the user experience.

Please refer to FIG. 4 . FIG. 4 is a schematic structural diagram of a mobile terminal disclosed in an embodiment of the present invention. In FIG. 4 , a mobile phone is used as an example for description. Referring to FIG. 4 , the mobile phone includes: a radio frequency (Radio Frequency, RF) circuit 910 , a memory 920 , an input unit 930 , a display unit 940 , a sensor 950 , an audio circuit 960 , a Wireless Fidelity (WiFi) module 970 , and a processor 980 , motherboard 880 and power supply 990 and other components. The processor 980 is arranged on the main board 880, and those skilled in the art can understand that the structure of the mobile phone shown in FIG. components, or a different arrangement of components.

The following describes the various components of the mobile phone in detail with reference to Figure 4:

RF circuitry 910 may be used for the reception and transmission of information. Typically, the RF circuit 910 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, RF circuitry 910 may communicate with networks and other devices via wireless communications. The above-mentioned wireless communication can use any communication standard or protocol, including but not limited to Global System of Mobile communication (GSM), General Packet Radio Service (General Packet Radio Service, GPRS), Code Division Multiple Access (Code Division Multiple Access) Access, CDMA), Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA), Long Term Evolution (Long Term Evolution, LTE), email, Short Messaging Service (Short Messaging Service, SMS) and the like.

The memory 920 can be used to store software programs and modules, and the processor 980 executes various functional applications and data processing of the mobile phone by running the software programs and modules stored in the memory 920 . The memory 920 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the mobile phone. Additionally, memory 920 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The input unit 930 may be used to receive inputted numerical or character information, and generate key signal input related to user setting and function control of the mobile phone. Specifically, the input unit 930 may include a fingerprint recognition module 931 and other input devices 932 . The fingerprint identification module 931 can collect the fingerprint data of the user on it. Besides the fingerprint recognition module 931 , the input unit 930 may also include other input devices 932 . Specifically, other input devices 932 may include, but are not limited to, one or more of a touch screen, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, and the like.

The display unit 940 may be used to display information input by the user or information provided to the user and various menus of the mobile phone. The display unit 940 may include a display screen 941. Optionally, the display screen 941 may be configured in the form of a liquid crystal display (Liquid Crystal Display, LCD), an organic light-emitting diode (Organic Light-Emitting Diode, OLED), or the like. Although in FIG. 4 , the fingerprint identification module 931 and the display screen 941 are used as two independent components to realize the input and input functions of the mobile phone, but in some embodiments, the fingerprint identification module 931 and the display screen 941 can be combined Integrated to realize the input and playback functions of the mobile phone.

The display unit 940 is connected to the mainboard 890 through the FPC 999, wherein the FPC includes: at least one exposed copper area, each exposed copper area includes at least one grounding via, and the FPC is grounded through the grounding via.

Optionally, each exposed copper area may include a plurality of ground vias, and each ground via is grounded.

Optionally, the distances between the multiple grounding vias may be uniformly arranged, and the uniformly arranged multiple grounding vias can reduce the path difference of the grounding lines of the multiple lines, thereby reducing the circulating current between different grounding lines. , improve the grounding effect and improve the effect of noise filtering.

Optionally, the at least one exposed copper area is disposed on a side close to the BTB. Setting the at least one exposed copper area on the side close to the BTB can make the noise signal filter before entering the display screen through the BTB, which has the advantage of effectively filtering the noise signal.

Optionally, the at least one exposed copper area is disposed on the other side close to the motherboard. Setting the exposed copper area on the other side close to the mainboard can enable a filter to be performed on the noise signal outputted from the mainboard, which can effectively filter the noise of the signal output by the mainboard and improve the filtering effect.

Optionally, at least one grounding via in each exposed copper area is connected to one end of the filter circuit, and the other end of the filter circuit is grounded. The filter circuit may specifically include: a first capacitor C1, one end of which is connected to the ground Through holes, the other end of the first capacitor C1 is grounded. This filter circuit mainly filters the grounded low-frequency noise through the capacitor.

Optionally, the above filter circuit may further include: a selection switch, a second capacitor C2, and a first inductor L1, wherein the common terminal of the selection switch is connected to the ground via, and the two selection terminals of the selection switch are respectively connected to the second capacitor. One end of C2 and one end of the first inductor L1 are connected, and the other end of the second capacitor C2 and the other end of the first inductor L1 are grounded. The above-mentioned selector switch may specifically be a single-pole double-throw switch. Of course, in practical applications, it may also be other selector switches. The specific embodiments of the present application do not limit the specific structure of the above-mentioned switches. This structure can filter both high-frequency noise and low-frequency noise, wherein the inductor L1 filters the high-frequency noise, and the capacitor C2 filters the low-frequency noise, thereby achieving the effect of improving noise filtering.

Optionally, the above-mentioned exposed copper areas may be multiple, and the multiple exposed copper areas may be arranged on one side close to the BTB and the other side close to the main board; when the other side close to the main board and the side close to the BTB are provided with When the copper area is exposed, setting the exposed copper area on the other side close to the motherboard and the side close to the BTB can effectively improve the effect of noise filtering and improve the user experience, because when the noise signal is transmitted through the FPC, the input If both sides will interfere with the output, then setting bare copper areas and grounding vias on both sides can effectively suppress noise and improve the filtering effect.

Optionally, the first ground through hole in the exposed copper area close to the other side of the motherboard is grounded through a high-frequency filter circuit. The high-frequency filter circuit may be an inductor. Specifically, one end of the inductor is connected to the first ground through hole. , the other end of the inductor is grounded. Correspondingly, the second ground through hole in the exposed copper area on one side of the BTB is grounded through a low-frequency filter circuit, which may specifically be a capacitor. Here, configuring low-frequency and high-frequency filter circuits on two different sides can improve the filtering effect. For high-frequency noise, it is found through experiments that more of it is generated on the motherboard side, so high-frequency filtering is set on the other side close to the motherboard. However, setting a low-frequency filter circuit in the BTB can more effectively improve the filtering of low-frequency noise, thereby improving the filtering effect, so it has the advantages of improving the filtering effect and improving the user experience.

The cell phone may also include at least one sensor 950, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display screen 941 according to the brightness of the ambient light, and the proximity sensor may turn off the display screen 941 and/or when the mobile phone is moved to the ear. or backlight. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (usually three axes), and can detect the magnitude and direction of gravity when it is stationary. games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor, etc. Repeat.

The audio circuit 960, the speaker 961, and the microphone 962 can provide an audio interface between the user and the mobile phone. The audio circuit 960 can convert the received audio data into an electrical signal, and transmit it to the speaker 961, and the speaker 961 converts it into a sound signal for playback; on the other hand, the microphone 962 converts the collected sound signal into an electrical signal, which is converted by the audio circuit 960 After receiving, the audio data is converted into audio data, and then processed by the audio data playback processor 980, and sent to, for example, another mobile phone through the RF circuit 910, or the audio data is played to the memory 920 for further processing.

WiFi is a short-distance wireless transmission technology. The mobile phone can help users to send and receive emails, browse web pages, and access streaming media through the WiFi module 970. It provides users with wireless broadband Internet access. Although FIG. 4 shows the WiFi module 970, it can be understood that it is not a necessary component of the mobile phone, and can be completely omitted as required within the scope of not changing the essence of the invention.

The processor 980 is the control center of the mobile phone, using various interfaces (for example, UART interface and USB interface) and lines to connect various parts of the entire mobile phone, by running or executing the software programs and/or modules stored in the memory 920, and calling The data stored in the memory 920 performs various functions of the mobile phone and processes data, so as to monitor the mobile phone as a whole. Optionally, the processor 980 may include one or more processing units; preferably, the processor 980 may integrate an application processor (AP) and a modem processor (Modem), wherein the application processor mainly processes the operating system, User interface and applications, etc., the modem processor mainly handles wireless communication. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 980.

The mobile phone also includes a power supply 990 (such as a battery) for supplying power to various components. Preferably, the power supply can be logically connected to the processor 980 through a power management system, so as to manage charging, discharging, and power consumption management functions through the power management system.

The mobile phone may further include a camera 9100, and the camera 9100 is used for capturing images and videos, and transmitting the captured images and videos to the processor 980 for processing.

The mobile phone may also have a Bluetooth module, etc., which will not be repeated here.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components may be combined or Integration into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

The embodiments of the present invention have been introduced in detail above, and specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the core idea of the present invention; A person of ordinary skill, according to the idea of the present invention, will have changes in specific embodiments and application scopes. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (6)

1. A flexible circuit board, characterized in that the flexible circuit board comprises: a flexible circuit board body, a board-to-board connector BTB and at least one exposed copper area; wherein, The at least one exposed copper area includes: at least one grounding through hole, and the flexible circuit board body is grounded through the at least one grounding through hole; The flexible circuit board further includes: a filter circuit, One end of the filter circuit is connected to the at least one ground through hole, and the other end of the filter circuit is connected to the ground; The filter circuit includes: a selection switch, a first capacitor, and a first inductor, wherein a common terminal of the selection switch is connected to the at least one grounding via, and two selection terminals of the selection switch are respectively connected to the first One end of the capacitor and one end of the first inductor, and the other end of the first capacitor and the other end of the first inductor are grounded. 2. The flexible circuit board according to claim 1, characterized in that, The at least one exposed copper area is provided on one side of the BTB of the flexible circuit board body or on the other side of the flexible circuit board body close to the main board. 3. The flexible circuit board according to claim 1 or 2, characterized in that, The at least one ground via is a plurality of ground vias. 4. The flexible circuit board according to claim 3, wherein, The distance between two adjacent ground vias in the plurality of ground vias is equal. 5. The flexible circuit board according to claim 1, wherein, The at least one exposed copper area includes a plurality of exposed copper areas, and the multiple exposed copper areas are arranged on one side of the BTB of the flexible circuit board body and on the other side of the flexible circuit board locally close to the main board ; The filter circuit further includes: a first filter circuit and a second filter circuit; One end of the first filter circuit is connected to the ground via in the exposed copper area on the other side, and the other end of the first filter circuit is grounded; One end of the second filter circuit is connected to the ground via in the exposed copper area on one side of the BTB, and the other end of the second filter circuit is grounded. 6. An electronic device comprising: a casing, a main board, and a display screen, wherein the electronic device further comprises the flexible circuit board according to any one of claims 1-5, the main board passing through The flexible circuit board is connected with the display screen.