CN218301760U - Circuit board assembly - Google Patents

Abstract

The embodiment of the application provides a circuit board assembly, wherein, circuit board assembly includes: the chip packaging structure comprises a main board, a plurality of chips and a plurality of packaging units, wherein a first side and a second side are respectively arranged on two sides of the main board in the thickness direction of the main board; the first sub-board is fixed on the second side of the main board and electrically connected with the main board, and a display screen electrically connected with the first sub-board is arranged on one side, away from the main board, of the first sub-board. According to the technical scheme, the user can observe the chip intuitively, and various functions of the chip can be displayed to the user conveniently.

Description

Circuit board assembly

The present application claims priority from a chinese patent application entitled "circuit board assembly" filed by the national intellectual property office at 2022, 5/6/month, application number 202221085484.0, the entire contents of which are incorporated herein by reference.

Technical Field

The application relates to the technical field of circuit boards, in particular to a circuit board assembly.

Background

In the related art, the circuit board is a support for the chips, and the circuit board is provided with metal conductors as lines for connecting the chips. However, since the circuit board is usually disposed inside the device, the user cannot visually observe the chip on the circuit board, and thus cannot show each function of the chip to the user.

SUMMERY OF THE UTILITY MODEL

Embodiments of the present application provide a circuit board assembly to solve or alleviate one or more technical problems in the prior art.

As an aspect of an embodiment of the present application, an embodiment of the present application provides a circuit board assembly, including: the chip packaging structure comprises a main board, a plurality of chips and a plurality of packaging units, wherein a first side and a second side are respectively arranged on two sides of the main board in the thickness direction of the main board; the first sub-board is fixed on the second side of the main board and electrically connected with the main board, and a display screen electrically connected with the first sub-board is arranged on one side, away from the main board, of the first sub-board.

In one embodiment, the main board is provided with a first signal socket, the first sub-board is provided with a second signal socket, the first signal socket and the second signal socket are connected through a first flat cable, one end of the first flat cable is connected to the first signal socket, and the other end of the first flat cable is connected to the second signal socket.

In one embodiment, the main board comprises two first edges opposite to each other and two second edges opposite to each other, the length of the first edges is greater than that of the second edges, the first signal socket is positioned on the second side surface of the main board, and the first signal socket is arranged at one side of the center of the main board close to any one second edge; the first sub-board comprises two third edges opposite to each other and two fourth edges opposite to each other, the third edges correspond to the first edges, the fourth edges correspond to the second edges, the second signal sockets are located on one side surface, facing the main board, of the first sub-board, and the second signal sockets are arranged on one side, close to any one of the fourth edges, of the center of the first sub-board.

In one embodiment, the main board is detachably connected with the first sub-board.

In one embodiment, at least one first threaded hole is formed in one of the main board and the first sub-board, at least one first through hole corresponding to the first threaded hole is formed in the other of the main board and the first sub-board, and at least one first threaded fastener penetrates through the corresponding first through hole to be in threaded connection with the corresponding first threaded hole.

In one embodiment, the number of the first threaded holes and the number of the first through holes are four, the four first threaded holes are located at four corners of the first sub-board respectively, and the four first through holes are located at four corners of the main board respectively.

In one embodiment, the first sub-board is formed with at least one relief hole penetrating the first sub-board in a thickness direction.

In one embodiment, the circuit board assembly further comprises: the second daughter board is fixed on the first side of the mainboard and electrically connected with the mainboard, and at least one camera electrically connected with the second daughter board is arranged on the second daughter board.

In one embodiment, the second sub-board includes a first sub-portion, a second sub-portion and a third sub-portion, the second sub-portion is connected between the first sub-portion and the third sub-portion, two ends of the second sub-portion respectively extend to a position beyond corresponding ends of the first sub-portion and the third sub-portion, the first sub-portion is disposed adjacent to an edge of the main board, and a notch is formed at one end of the first sub-portion and penetrates through an end surface of the first sub-portion.

In one embodiment, the main board is detachably connected with the second sub-board.

In one embodiment, at least one second threaded hole is formed in one of the main board and the second sub-board, at least one second through hole corresponding to the second threaded hole is formed in the other of the main board and the second sub-board, and at least one second threaded fastener penetrates through the corresponding second through hole to be in threaded connection with the corresponding second threaded hole.

In one embodiment, there are two second threaded holes and two second through holes, where the two second threaded holes are located on two sides of the main board in the width direction, and the two second through holes are located on two ends of the second sub-portion.

In one embodiment, a side of the first sub-portion away from the second sub-portion corresponds to a side edge of the main board.

In one implementation mode, a third signal connector is arranged on the main board, a fourth signal connector is arranged on the second sub-board, a plurality of signal pins are arranged on one of the third signal connector and the fourth signal connector, a limiting groove is formed in the other of the third signal connector and the fourth signal connector, and the plurality of signal pins are located in the limiting groove.

In one embodiment, the main board comprises two first edges opposite to each other and two second edges opposite to each other, the length of the first edges is greater than that of the second edges, the third signal connector is positioned on the first side surface of the main board, and the third signal connector is arranged on one side of the center of the main board close to any one of the second edges; the fourth signal connector is disposed on a side surface of the first sub-portion facing the main board, and the fourth signal connector is located on a side of the first sub-portion far away from the second sub-portion.

In one embodiment, the first side surface of the main board is provided with at least one of a network port module, an audio interface module, an SD card module, an HDMI module, a USB module, an image input module, a power interface module, and a speaker module.

By adopting the technical scheme, the embodiment of the application can enable a user to visually observe the chip, and is favorable for showing various functions of the chip to the user.

The foregoing summary is provided for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will be readily apparent by reference to the drawings and the following detailed description.

Drawings

In the drawings, like reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily to scale. It is appreciated that these drawings depict only some embodiments in accordance with the disclosure and are not to be considered limiting of its scope.

FIG. 1 illustrates a schematic structural diagram of a circuit board assembly according to an embodiment of the present application;

FIG. 2 illustrates a schematic diagram of a main board and a first sub-board according to an embodiment of the present application;

FIG. 3 shows a schematic structural diagram of a motherboard according to an embodiment of the present application;

FIG. 4 illustrates a schematic structural diagram of a first sub-board according to an embodiment of the present application;

fig. 5 shows a schematic structural diagram of a second sub-board according to an embodiment of the present application;

fig. 6 shows a schematic diagram of a main board and a second sub-board according to an embodiment of the present application.

Description of reference numerals:

100: a circuit board assembly;

110: a main board; 111: a first signal receptacle; 112: a first mounting hole; 113a: a network port module; 113b: an audio interface module; 113c: an SD card module; 113d: an HDMI module; 113e: a USB module; 113f: an image input module; 113g: a power interface module; 113h: a speaker module; 114: a chip; 115: a first edge; 116: a second edge; 117: a third signal connector; 118: a second threaded hole;

120: a first sub-board; 121: a second signal receptacle; 122: a second mounting hole; 123: avoiding holes; 124: a third edge; 125: a fourth edge;

130: a first flat cable;

140: a second sub-board; 141: a first sub-section; 1411: a notch; 142: a second sub-portion; 143: a third sub-section; 144: a second through hole; 145: a fourth signal connector;

200: a display screen;

300: a camera is provided.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

Fig. 1 shows a schematic structural diagram of a circuit board assembly 100 according to an embodiment of the present application. As shown in fig. 1, the circuit board assembly 100 includes a main board 110 and a first sub-board 120.

Specifically, two sides of the main board 110 in the thickness direction are a first side and a second side, respectively, and the first side surface of the main board 110 is provided with a plurality of chips 114. In the description of the present application, "a plurality" means two or more.

The first sub-board 120 is fixed to a second side of the main board 110, the first sub-board 120 is electrically connected to the main board 110, and a display screen 200 electrically connected to the first sub-board 120 is disposed on a side of the first sub-board 120 away from the main board 110.

Here, it should be noted that the phrase "the first sub-board 120 is fixed to the main board 110" should be broadly understood in this application, as long as the first sub-board 120 and the main board 110 are ensured to be relatively fixed in the installation state, and the first sub-board 120 and the main board 110 cannot generate relative movement in any state.

Illustratively, the main board 110 and the first sub-board 120 may be fixedly connected by at least one first threaded fastener. For example, the main board 110 and the first sub-board 120 may have a substantially rectangular structure. The main board 110 and the first sub-board 120 may have substantially the same size, the main board 110 may have a length of 130mm to 160mm (inclusive), for example, 140mm, a width of 70mm to 100mm (inclusive), for example, 80mm, the first sub-board 120 may have a length of 130mm to 160mm (inclusive), for example, 140mm, and a width of 70mm to 100mm (inclusive), for example, 80mm.

The outer contour dimension of the first sub-board 120 may be the same as the outer contour dimension of the main board 110, and the edge of the first sub-board 120 is flush with the corresponding edge of the main board. For example, in a case where the main board 110 and the first sub-board 120 are both rectangular, each side of the first sub-board 120 is flush with a corresponding side of the main board 110.

Here, it should be noted that "the outer contour dimension of the first sub-board 120 is the same as the outer contour dimension of the main board 110" should be broadly understood in the present application, and means that the outer contour dimension of the first sub-board 120 is the same as the outer contour dimension of the main board 110 within a certain error range, and is not limited to be completely the same.

The main board 110 is detachably connected with the first sub-board 120. So configured, the first sub-board 120 and the main board 110 are more convenient to mount and dismount, thereby facilitating testing of the performance of different display screens 200.

For example, the first mounting holes 112 may be formed through the four corners of the main board 110, and the second mounting holes 122 may be formed through the four corners of the first sub-board 120, where the first mounting holes 112 and the second mounting holes 122 are through holes. The four first threaded fasteners may sequentially pass through the corresponding second mounting holes 122 and the first mounting holes 112 and then be threadedly coupled to the corresponding first nuts. Or, the first mounting hole 112 is a first through hole, the second mounting hole 122 is a first threaded hole, and the four threaded fasteners respectively penetrate through the corresponding first through holes to be in threaded connection with the corresponding first threaded holes. Still alternatively, the first mounting holes 112 at least two opposite corners are threaded holes, and the first threaded fasteners can pass through the second mounting holes 122 to be threadedly connected with the first mounting holes 112. Therefore, the first threaded fastener is convenient to mount and dismount while realizing the relative fixation between the main board 110 and the first sub-board 120, has high universality, and can test the performance of the display screen 200 more conveniently.

Four first mounting holes 112 and four second mounting holes 122 are shown in fig. 3 and 4 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solution of the present application that the technical solution can be applied to other numbers of first mounting holes 112 and second mounting holes 122, and the present application is also within the protection scope of the present application.

The first sub-board 120 may be a screen sub-board, and since the first sub-board 120 is electrically connected to the main board 110, signal transmission may be performed between the first sub-board 120 and the main board 110, so that an image may be displayed on the display screen 200.

The motherboard 110 may include at least one of a network Interface module 113a, an audio Interface module 113b, an sd (Secure Digital) card module, an HDMI (High Definition Multimedia Interface) module, a USB (Universal Serial Bus) module, an image input module 113f, a power Interface module 113g, and a speaker module 113 h. The network port module 113a may be connected to a network cable, and configured to transmit data; the audio interface module 113b may be connected to an earphone line, and configured to transmit audio data; a memory card may be provided in the SD card module 113c to store data; the HDMI module 113d may be connected to an HDMI line for transmitting video data; the USB module 113e may be connected to a USB disk, a data line, and the like, and is configured to transmit data; the power interface module 113g may be connected to a power line to supply power to the main board 110; the speaker module 113h is used to convert the current frequency into sound.

According to the circuit board assembly 100 of the embodiment of the application, the main board 110, the first sub-board 120 and the display screen 200 can be integrated into a whole structure, thereby being convenient for a user to carry. Moreover, the chips 114 are located on a side surface of the main board 110 away from the display screen 200, so that a user can visually observe the chips 114, which is beneficial to showing various functions of the chips 114 to the user.

In an alternative embodiment, referring to fig. 2, the main board 110 may be provided with a first signal socket 111, the first sub-board 120 may be provided with a second signal socket 121, the first signal socket 111 and the second signal socket 121 are connected by a first flat cable 130, one end of the first flat cable 130 is connected to the first signal socket 111, and the other end of the first flat cable 130 is connected to the second signal socket 121.

Illustratively, the main board 110 includes two first edges 115 opposite to each other and two second edges 116 opposite to each other, the two first edges 115 are respectively connected to two ends of the two second edges 116, a length of the first edge 115 is greater than a length of the second edge 116, the first signal socket 111 is located on a second side surface of the main board 110, and the first signal socket 111 is located adjacent to one of the two second edges 116, that is, the first signal socket 111 is located at a side of a center of the main board 110 near any one of the second edges 116. The first sub board 120 includes two third edges 124 opposite to each other and two fourth edges 125 opposite to each other, the third edge 124 corresponds to the first edge 115, the fourth edge 125 corresponds to the second edge 116, the second signal socket 121 is located on a side surface of the first sub board 120 facing the main board 110, and the second signal socket 121 is disposed adjacent to one of the two fourth edges 125, that is, the second signal socket 121 is disposed at a side of the center of the first sub board 120 near any one of the fourth edges 125.

Thus, with the above arrangement, on one hand, the main board 110 and the first sub-board 120 can be electrically connected through the first flat cable 130, so that the signals can be directly transmitted between the main board 110 and the first sub-board 120. On the other hand, the first flat cable 130 can make the arrangement position between the first signal socket 111 and the second signal socket 121 more flexible, so as to reduce the installation requirements and the installation difficulty of the first signal socket 111 and the second signal socket 121 while realizing the electrical connection between the first signal socket 111 and the second signal socket 121, thereby effectively improving the installation efficiency and having lower cost.

In another alternative embodiment, the main board 110 may be provided with a first signal connector, and the first sub-board 120 may be provided with a second signal connector, and the first signal connector is plugged with the second signal connector (not shown). With such an arrangement, on one hand, the main board 110 and the first sub-board 120 can be electrically connected through the first signal connector and the second signal connector, so that the signals can be directly transmitted between the main board 110 and the first sub-board 120. On the other hand, the occupied space of the first signal connector and the second signal connector is smaller, so that the appearance of the whole circuit board assembly 100 is more concise and attractive, the user experience is effectively improved, and the portability of the circuit board assembly 100 is improved.

In one embodiment, as shown in fig. 4, at least one relief hole 123 is formed on the first sub-board 120. For example, one escape hole 123 is shown in the example of fig. 4, the escape hole 123 penetrates the entire first sub-board 120 in the thickness direction of the first sub-board 120, and the escape hole 123 is disposed adjacent to one of the short sides of the first sub-board 120. The avoiding hole 123 may include a first trapezoidal hole and a second trapezoidal hole, and a hypotenuse of the first trapezoidal hole and a hypotenuse of the second trapezoidal hole are communicated. The second trapezoidal hole is located at one side of the first trapezoidal hole adjacent to the center of the first sub-board 120, and the area of the second trapezoidal hole may be smaller than that of the first trapezoidal hole.

Therefore, by arranging the avoiding hole 123, on one hand, the avoiding hole can be used for avoiding structural members on the main board 110 and the display screen 200, which is beneficial to the spatial layout of the structural members on the main board 110 and avoids interference; on the other hand, the weight of the first sub-board 120 may be reduced, the cost of the entire circuit board assembly 100 may be reduced, and the circuit board assembly 100 may be more portable.

In one embodiment, referring to fig. 5 and 6, the circuit board assembly 100 further includes a second sub-board 140, the second sub-board 140 is fixed to a first side of the main board 110, the second sub-board 140 is electrically connected to the main board 110, and at least one camera 300 is disposed on the second sub-board 140. Illustratively, referring to fig. 3 and 5, the long side of the second sub-board 140 may be parallel to the short side of the main board 110. The number of the cameras 300 may be two, and two cameras 300 may be disposed on a side surface of the second sub-board 140 away from the main board 110 at intervals along the length direction of the second sub-board 140. The camera 300 may be used to acquire image signals.

The second sub-board 140 can be formed with a plurality of second through holes 144, the main board 110 can be formed with a plurality of second threaded holes 118, and the second threaded fastener can pass through the second through holes 144 and be in threaded connection with the corresponding second threaded holes 118, so that the detachable connection of the second sub-board 140 and the main board 110 is realized, the mounting and dismounting of the second sub-board 140 and the main board 110 are facilitated, and the performance of different cameras 300 can be tested conveniently. Therefore, by providing the second sub-board 140, the main board 110, the first sub-board 120, the display screen 200, the second sub-board 140 and the camera 300 can be integrated into a whole structure, so that the functions of the circuit board assembly 100 are enriched, and the portability of the circuit board assembly 100 can be further improved.

In one example, in conjunction with fig. 5, the second sub-board 140 may include a first sub-portion 141, a second sub-portion 142, and a third sub-portion 143, the second sub-portion 142 being connected between the first sub-portion 141 and the third sub-portion 143. Two ends of the second sub-portion 142 respectively extend to exceed two ends of the first sub-portion 141, and two ends of the second sub-portion 142 respectively extend to exceed two ends of the third sub-portion 143. The length of the first sub-portion 141 is greater than that of the third sub-portion 143, and a notch 1411 penetrating the end surface of the first sub-portion 141 may be formed at one end of the first sub-portion 141 to avoid the audio interface module 113 b. The number of the second threaded holes 118 and the number of the second through holes 144 may be two, the two second threaded holes 118 are located at two sides of the main plate 110 in the width direction, and the two second through holes 144 are located at two ends of the second sub-portion.

In an alternative embodiment, the main board 110 may be provided with a third signal connector 117, the second sub-board 140 may be provided with a fourth signal connector 145, one of the third signal connector 117 and the fourth signal connector 145 is provided with a plurality of signal pins, and the other of the third signal connector and the fourth signal connector is formed with a limiting groove, in which the plurality of signal pins are located, so as to implement the plugging of the third signal connector 117 and the fourth signal connector 145.

With such an arrangement, the main board 110 and the second sub-board 140 can be electrically connected through the third signal connector 117 and the fourth signal connector 145, so that direct transmission of signals between the main board 110 and the second sub-board 140 can also be achieved. In addition, the occupied space of the third signal connector 117 and the fourth signal connector 145 is smaller, so that the appearance of the whole circuit board assembly 100 is more concise and attractive, the flat cable is prevented from being exposed, and the user experience can be further improved.

Of course, the present application is not limited thereto, and in another alternative embodiment, a third signal socket may be disposed on the main board 110, a fourth signal socket may be disposed on the second sub-board 140, and the third signal socket and the fourth signal socket are connected by a second flat cable (not shown). In this way, the main board 110 and the second sub-board 140 may be electrically connected through the second flat cable, so as to directly transmit signals between the main board 110 and the second sub-board 140. Moreover, the second flat cable can enable the setting position between the third signal socket and the fourth signal socket to be more flexible, so that the installation requirements and the installation difficulty of the third signal socket and the fourth signal socket are reduced while the electric connection between the third signal socket and the fourth signal socket is realized, the installation efficiency is effectively improved, and the cost is also lower.

In one embodiment, the second sub-board 140 may be disposed at an edge region of the main board 110. For example, a side of the first sub-portion 141 distant from the second sub-portion 142 may correspond to a short side of the main board 110. Therefore, the second sub-board 140 can be located on one side of the chip 114, so that the chips 114 can be concentrated on the same area, the chips 114 are prevented from being distributed, the aesthetic property of the surface of the first side of the main board 110 can be further improved, and the observation by a user is facilitated.

Other configurations of the circuit board assembly 100 of the above-described embodiments may be adopted by various technical solutions known by those skilled in the art now and in the future, and will not be described in detail herein.

In the description of the present specification, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; the connection can be mechanical connection, electrical connection or communication; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The above disclosure provides many different embodiments or examples for implementing different structures of the application. The components and arrangements of specific examples are described above to simplify the present disclosure. Of course, they are merely examples and are not intended to limit the present application. Further, the present application may repeat reference numerals and/or reference letters in the various examples for simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or arrangements discussed.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of various changes or substitutions within the technical scope of the present application, and these should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (16)

1. A circuit board assembly, comprising:

the chip packaging structure comprises a main board, a plurality of chips and a plurality of packaging units, wherein a first side and a second side are respectively arranged on two sides of the main board in the thickness direction;

the first sub-board is fixed on the second side of the main board, the first sub-board is electrically connected with the main board, and a display screen electrically connected with the first sub-board is arranged on one side, away from the main board, of the first sub-board.

2. The circuit board assembly of claim 1, wherein the main board is provided with a first signal socket, the first sub-board is provided with a second signal socket, the first signal socket and the second signal socket are connected by a first flat cable, one end of the first flat cable is connected to the first signal socket, and the other end of the first flat cable is connected to the second signal socket.

3. The circuit board assembly according to claim 2, wherein the main board includes two first edges opposite to each other and two second edges opposite to each other, the first edges have a length greater than that of the second edges, the first signal socket is located on the second side surface of the main board, and the first signal socket is disposed on one side of the center of the main board near any one of the second edges;

the first sub-board comprises two third edges opposite to each other and two fourth edges opposite to each other, the third edges correspond to the first edges, the fourth edges correspond to the second edges, the second signal socket is located on one side surface, facing the main board, of the first sub-board, and the second signal socket is arranged on one side, close to any one of the fourth edges, of the center of the first sub-board.

4. The circuit board assembly of claim 1, wherein the main board is removably connected with the first daughter board.

5. The circuit board assembly of claim 4, wherein at least one first threaded hole is formed in one of the main board and the first sub-board, and at least one first through hole corresponding to the first threaded hole is formed in the other of the main board and the first sub-board, and at least one first threaded fastener is threaded through the corresponding first through hole and into the corresponding first threaded hole.

6. The circuit board assembly according to claim 5, wherein the number of the first screw holes and the number of the first through holes are four, the four first screw holes are located at four corners of the first sub board, and the four first through holes are located at four corners of the main board.

7. The circuit board assembly according to claim 1, wherein the first sub-board is formed with at least one relief hole penetrating the first sub-board in a thickness direction.

8. The circuit board assembly of any of claims 1-7, further comprising:

the second daughter board is fixed on the first side of the mainboard and electrically connected with the mainboard, and at least one camera electrically connected with the second daughter board is arranged on the second daughter board.

9. The circuit board assembly according to claim 8, wherein the second sub-board includes a first sub-portion, a second sub-portion and a third sub-portion, the second sub-portion is connected between the first sub-portion and the third sub-portion, two ends of the second sub-portion respectively extend to exceed corresponding ends of the first sub-portion and the third sub-portion, the first sub-portion is disposed adjacent to an edge of the main board, and a notch is formed at one end of the first sub-portion and penetrates through an end surface of the first sub-portion.

10. The circuit board assembly of claim 9, wherein the main board is removably connected with the second daughter board.

11. The circuit board assembly according to claim 10, wherein at least one second threaded hole is formed on one of the main board and the second sub-board, at least one second through hole corresponding to the second threaded hole is formed on the other of the main board and the second sub-board, and at least one second threaded fastener is threaded into the corresponding second threaded hole through the corresponding second through hole.

12. The circuit board assembly according to claim 11, wherein the number of the second screw holes and the number of the second through holes are two, the two second screw holes are located on two sides of the main board in the width direction, and the two second through holes are located on two ends of the second sub-portion.

13. The circuit board assembly as claimed in claim 9, wherein a side of the first sub-portion away from the second sub-portion corresponds to a side edge of the main board.

14. The circuit board assembly according to claim 9, wherein a third signal connector is disposed on the main board, a fourth signal connector is disposed on the second sub-board, one of the third signal connector and the fourth signal connector has a plurality of signal pins, and the other of the third signal connector and the fourth signal connector has a retaining groove, and the plurality of signal pins are disposed in the retaining groove.

15. The circuit board assembly according to claim 14, wherein the main board includes two first edges opposite to each other and two second edges opposite to each other, a length of the first edges is greater than a length of the second edges, the third signal connector is located on a first side surface of the main board, and the third signal connector is disposed at a side of a center of the main board near any one of the second edges;

the fourth signal connector is disposed on a side surface of the first sub-portion facing the main board, and the fourth signal connector is located on a side of the first sub-portion away from the second sub-portion.

16. The circuit board assembly according to any one of claims 1 to 7, wherein at least one of a network port module, an audio interface module, an SD card module, an HDMI module, a USB module, an image input module, a power interface module, and a speaker module is disposed on the first side surface of the main board.

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