CN115003006A

CN115003006A - Circuit board, electronic equipment and test method

Info

Publication number: CN115003006A
Application number: CN202111294795.8A
Authority: CN
Inventors: 董晓勇; 杨朝亮
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-09-02
Anticipated expiration: 2041-11-03
Also published as: CN115003006B

Abstract

The embodiment of the application discloses a circuit board, electronic equipment and a test method. The circuit board provided by the embodiment of the application comprises a first connecting end and a second connecting end, wherein the first connecting end and the second connecting end are provided with connecting pieces used for connecting corresponding electronic elements, the circuit board further comprises at least one test circuit, the second connecting end is provided with a test port, one end of the test circuit is connected with the test port, and the other end of the test circuit is connected with the connecting pieces of the first connecting end.

Description

Circuit board, electronic equipment and test method

Technical Field

The present application relates to the field of electronic technologies, and in particular, to a circuit board, an electronic device, and a test method.

Background

As shown in fig. 1, fig. 1 is a schematic diagram of a main board, a sub-board and a display screen of an electronic device connected via a circuit board.

The electronic device comprises a display screen 4 ', a main board 1' and an auxiliary board 3 ', wherein the display screen 4' is, for example, an LCD display screen or an OLED display screen, the display screen 4 'is connected with the main board 1' and the auxiliary board 3 'through a flexible circuit board 2', the flexible circuit board 2 'in FIG. 1 combines a main display screen FPC2 a' and an auxiliary FPC2b ', the main board 1' is connected with the display screen 4 'of the electronic device through a main display screen FPC2 a', and a power circuit 31 'of the auxiliary board 3' is connected with the display screen 4 'through an auxiliary FPC2 b'. When the display screen 4 ' is tested, the BTB connector 22 ' connected with the main display screen FPC2a ' and the main board 1 ', and the BTB connector 23 ' connected with the sub FPC2b ' and the sub board 3 ' need to be connected with the testing equipment, but the sub FPC2b ' is small, and is difficult to extend out of the display screen 4 ' even if the sub FPC2b ' is unfolded, and the clamp of the testing equipment is difficult to clamp the sub FPC2b '.

One solution is to lengthen the sub FPC2b ', but the excessively lengthened sub FPC2 b' is difficult to apply to an actual product; in another solution, the signals of the main display screen FPC2a ' and the sub FPC2b ' are combined and then tested by arranging the switching FPC, but the testing efficiency is low in this way, and the BTB connector needs to be fastened with the BTB connector of the switching FPC for testing, so that the damage ratio of the BTB connector of the flexible circuit board 2 ' is easily increased.

Disclosure of Invention

The embodiment of the application provides a circuit board, electronic equipment and a test method.

On one hand, the embodiment of the application provides a circuit board, which comprises a first connecting end and a second connecting end, wherein the first connecting end and the second connecting end are provided with connecting pieces used for connecting corresponding electronic elements, the circuit board further comprises at least one test circuit, the second connecting end is provided with a test port, one end of the test circuit is connected with the test port, and the other end of the test circuit is connected with the connecting pieces of the first connecting end. The test circuit and the test port are arranged at the second connecting end, and signals to be tested of other connecting ends can be transferred to the second connecting end provided with the test port, so that the effect of testing at least two connecting ends can be achieved only when the second connecting end is tested.

On the one hand, the embodiments of the present application further provide a first implementation manner of the one hand:

the electronic component connected by the connecting piece of the first connecting end is a part to be tested. The first connecting end is connected with a part to be tested, and the connecting piece and the test port of the second connecting end can perform signal test on the part to be tested.

Based on the first implementation manner of an aspect, the present application provides a second implementation manner of an aspect:

the part to be tested is a display screen, and the electronic element connected with the connecting piece of the second connecting end is a printed circuit board. The circuit board is connected with the display screen and the printed circuit board, so that various signals of the display screen can be tested aiming at the second connecting end.

Based on the second implementation manner of one aspect, the embodiment of the present application further provides a third implementation manner of one aspect:

the circuit board further comprises a third connecting end provided with a connecting piece, the printed circuit board connected by the connecting piece of the second connecting end is a main board, and an electronic element connected by the connecting piece of the third connecting end is an auxiliary board. The second connecting plate provided with the test port is connected with the mainboard, so that the clamping test of the test equipment is more convenient.

Based on the third implementation manner of one aspect, the example of the present application further provides a fourth implementation manner of one aspect:

the circuit board is provided with at least one group of bus lines and branch lines, one end of each branch line is connected with the corresponding test port, the other end of each branch line is connected with the connecting piece of the first connecting end, the bus lines are connected with the third connecting end and the branch lines, the part of each branch line from the position where the bus lines are connected to the test ports is the test line, and the test line is connected with the third connecting end through the bus lines. The parallel arrangement of the test circuit and the power signal circuit is met through the bus circuit and the branch circuit, so that the circuit design is simple.

Based on the third or fourth implementation manner of an aspect, the examples of the present application further provide a fifth implementation manner of an aspect:

the mainboard comprises a processor, and the processor is used for providing a control signal for the display screen; the sub-board includes a power circuit for supplying power to the display screen. The electronic element connected with the part to be tested comprises a main board and an auxiliary board, the processor is arranged on the main board, the power circuit is arranged on the auxiliary board, and the main board and the auxiliary board are connected through a circuit board, so that the connector can be reduced, the utilization rate of the area of the main board is improved, and the hardware cost is reduced.

Based on an aspect and the first to fifth implementation manners of the aspect, the embodiments of the present application further provide a sixth implementation manner of the aspect:

the test port is located between the connector of the second connection end and an edge of the second connection end. The connector and the edge are spaced to facilitate the placement of the test port.

Based on the first to fifth implementation manners of an aspect, the present application provides a seventh implementation manner of an aspect:

the connecting piece of the second connecting end comprises a first connecting piece and a second connecting piece, the first connecting piece is used for being connected with the part to be tested, and the test port is located between the second connecting piece and the edge of the second connecting end. The testing port is arranged between the edges of the second connecting piece and the second connecting end, the testing port can be relatively far away from the first connecting piece for transmitting display screen signals, the distance between the testing port and the first connecting piece can be increased, the difficulty of clamp design is reduced, and testing interference of pins of the testing port and the first connecting piece is avoided.

Based on the first to fifth implementation manners of an aspect, the present application provides an eighth implementation manner of an aspect:

and one part of the test circuit is positioned beside the connecting piece of the second connecting end and extends to the outer side of the connecting piece. Due to the arrangement, on one hand, the test circuit is convenient to be additionally arranged on the existing circuit board, and the connection of the existing circuit and the connecting piece on the circuit board can not be interfered or influenced.

Based on an aspect and the first to eighth implementation manners of the aspect, the examples of the present application further provide a ninth implementation manner of the aspect:

the circuit board is a flexible circuit board. The flexible circuit board is suitable for realizing the connection of electronic components.

Based on an aspect and the first to eighth implementation manners of the aspect, embodiments of the present application further provide a tenth implementation manner of the aspect:

at least one of the first connection end and the second connection end is a BTB connector. The BTB connector facilitates connection of electronic components.

In a second aspect, embodiments of the present application further provide an electronic device, which includes at least two electronic components and the circuit board according to one aspect and any one of the first to tenth implementation manners of the one aspect. The circuit board has the same technical effects as the circuit board and is not described in detail.

Based on the second aspect, the embodiments of the present application further provide a first implementation manner of the second aspect:

the electronic element of the electronic equipment comprises a display screen, a main board and an auxiliary board, wherein the main board comprises a processor for providing a control signal for the display screen, the auxiliary board is provided with a power circuit for supplying power to the display screen, the circuit board comprises a third connecting end, a connecting piece of the first connecting end is connected with the display screen, a connecting piece of the second connecting end is connected with the main board, and a connecting piece of the third connecting end is connected with the power circuit of the auxiliary board. The second connecting plate provided with the test port is connected with the mainboard of the display screen, so that the clamping test of the test equipment is more convenient.

Based on the first implementation manner of the second aspect, the present application provides a second implementation manner of the second aspect:

the display screen is an LCD or OLED display screen, and the power supply circuit is an LCD drive circuit or an OLED drive circuit. The power supply signal of the LCD or OLED display screen is more, and the number of the connecting ends for testing can be reduced by arranging the second connecting end.

In a third aspect, an embodiment of the present application further provides a test method, which is performed through the circuit board described in any one of the first to tenth implementation manners on the one hand and the one hand, during a test, a second connection end provided with the test port on the circuit board is clamped by a clamp, and the test circuit board of the clamp is simultaneously connected to a connection piece of the second connection end and the test port for performing a test. In the test method, the test circuit board of the clamp can be simultaneously connected with the connecting piece and the test port of the second connecting end, so that the test efficiency can be improved.

Drawings

FIG. 1 is a schematic diagram of a main board, an auxiliary board and a display screen of an electronic device connected by a circuit board;

fig. 2 is a schematic diagram illustrating a connection between a main board, an auxiliary board and a display screen of an electronic device according to an embodiment of the present application through a circuit board;

FIG. 3 is a schematic view of the circuit board of FIG. 2;

FIG. 4 is a first structural diagram of a second connection terminal of the circuit board of FIG. 3;

FIG. 5 is a schematic view of the fixture of the test apparatus clamping the circuit board shown in FIG. 3;

FIG. 6 is a second structural diagram of a second connecting terminal of the circuit board shown in FIG. 3;

fig. 7 is a schematic diagram of a first circuit board element and a second circuit board element of an electronic device according to a second embodiment of the present application, connected to a first part to be tested and a second part to be tested via circuit boards;

FIG. 8 is a schematic view of a circuit board of the third embodiment of the present application shown in FIG. 2;

FIG. 9 is a schematic diagram of a circuit board according to an embodiment of the present application;

fig. 10 is a schematic diagram of another circuit board according to an embodiment of the present application.

Detailed Description

The embodiment of the application provides a circuit board, and the link of circuit board is equipped with the connecting piece, can connect the electronic component in the electronic equipment through the connecting piece, and the connection mentioned in this application can be electric connection or mechanical connection, or be electric connection and mechanical connection simultaneously, and the electric connection can transmit power signal and control signal etc.. Specifically, the plurality of electronic components of the electronic device may be a main board, a sub-board, and a display screen, please refer to fig. 2-3, and fig. 2 is a schematic diagram illustrating the connection between the main board, the sub-board, and the display screen of the electronic device through a circuit board in the first embodiment of the present application; FIG. 3 is a schematic diagram of the circuit board of FIG. 2; fig. 4 is a first structural diagram of the second connection end 22 of the circuit board in fig. 3.

The electronic device in this embodiment of the application includes a display screen 4, a main board 1 and a sub-board 3, where the display screen 4 is, for example, a Liquid Crystal Display (LCD) display screen or an organic light-emitting display (OLED) display screen, and the display screen 4 is connected to the main board 1 and the sub-board 3 through a Circuit board, and the Circuit board may be a Flexible Printed Circuit board 2 (FPC), which certainly does not exclude a hard board or a rigid-flex board, and the Circuit board of this embodiment is mainly used to implement connection of the main board 1, the sub-board 3 and the display screen 4, and the Flexible Circuit board 2 is more suitable for such a connection occasion, especially when the display screen 4 is an LCD display screen or an OLED display screen, there are more required connection points, and the Flexible Circuit board 2 is more suitable for implementing such a connection. As shown in fig. 2, the flexible circuit board 2 is provided with a first connection end 21 for connecting the display screen 4 of the electronic device, a second connection end 22 for connecting the main board 1, and a third connection end 23 for connecting the power circuit 31 of the secondary board 3, and each connection end is connected with the main board 1, the display screen 4, or the secondary board 3 through a connecting member. Each connection terminal may be a board-to-board (BTB) connector, as shown in fig. 4, or may be a Zero Insertion Force (ZIF) connector, and the pins of the connector are connection parts of the connection terminal, and the connector is convenient for performing plug-in connection with the main board 1 and the sub-board 3, but it should be understood that each connection terminal may also be other types of connection structures, for example, the connection parts of the connection terminal may be connection structures containing conductive media, for example, the first connection terminal 21 is taken as an example, the connection structures may be welded with corresponding pins of a module chip (not shown in the figure) of the display screen 4, and the pins for welding are connection parts of the connection terminal.

The plurality of first lines 25 between the first connection end 21 and the second connection end 22 of the flexible circuit board 2 can directly transmit the data signal and the control signal of the motherboard 1 to the display screen 4, and certainly, other signals can also be transmitted, and in addition, the module chip of the display screen 4 can also transmit signals to the corresponding chip of the motherboard 1 through the plurality of first lines 25.

In fig. 2, the motherboard 1 is provided with a processor, the processor includes, for example, an SOC (system on chip) chip 11, where the SOC is a system-on chip, and the PMU is a power management Unit, and the processor may further include a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), and the like. In fig. 2, the connecting element of the second connecting end 22 is connected to the SOC & PMU chip 11 of the motherboard 1, and a circuit between the first connecting end 21 and the third connecting end 23 of the flexible circuit board 2 may transmit a signal of the power circuit 31 to the display screen 4, so as to drive the display screen 4, where the power circuit 31 is, for example, an LCD driving circuit and an OLED driving circuit, and the power circuit 31 may specifically be a power chip; the second line 24 between the second connection terminal 22 and the third connection terminal 23 may also transmit signals of the main board 1 to the sub board 3, and the control signals of the SOC & PMU chip 11 in fig. 2 are transmitted to the power circuit 31 of the sub board 3 through the second connection terminal 22, the second line 24, and the third connection terminal 23.

It can be seen that, in the present embodiment, the control signal, the data signal, the power signal transmission line of the display 4 and the main board 1 to sub-board 3 transmission line are all combined on one flexible circuit board 2, in fig. 2, the circuit board portion of the main board 1 transmitting the signal to the display 4 is defined as the main display FPC2a, and the circuit board portion of the sub-board 3 transmitting the power signal to the display 4 is defined as the sub-FPC 2 b. The sub FPC2b shown in fig. 2 is provided with only the power supply circuit 31, but actually the sub FPC may be provided with a larger variety of chips, for example, the sub FPC2b may be provided with a motor drive power supply chip, a speaker power amplifier, and the like, and the present embodiment is not particularly limited. It can be seen that, in this embodiment, the main display FPC2a and the sub FPC2b are combined, and two connectors originally required to be provided on the main board 1 and connected to the display 4 and the sub board 3 may be combined into one connector, so as to reduce the area of the main board 1 occupied by the connectors, improve the utilization rate of the area of the main board 1, reduce the number of FPCs and corresponding connecting terminals, and reduce the hardware cost.

On the basis, please refer to fig. 2 and 3, in this embodiment, the flexible circuit board 2 further has a test circuit, the second connection end 22 is provided with a test port 22b in addition to a connection element 221 (shown in fig. 4), that is, the second connection end 22 is provided with the test port 22b and the connection element 221 at the same time, one end of the test circuit 261 is the test port 22b, and the other end of the test circuit 261 is connected to the connection element of the third connection end 23, that is, the connection can be established with the power circuit 31 of the sub-board 3. The test circuit 261 provided in the flexible circuit board 2 in this embodiment can be used when testing the display screen 4 of the electronic device alone.

Specifically, referring to fig. 5, fig. 5 is a schematic diagram of a fixture of a testing apparatus clamping the circuit board shown in fig. 3.

When the display screen 4 is tested, the data signal and the power signal of the display screen 4 need to be tested, and therefore, the connecting piece of the second connecting end 22 of the flexible circuit board 2 for connecting with the main board 1 and the third connecting end 23 of the flexible circuit board 2 for connecting with the power circuit 31 of the auxiliary board 3 need to be connected with the testing equipment.

As shown in fig. 4, the connector 221 of the second connection terminal 22 of the flexible circuit board 2 has a plurality of leads 22a, and the test circuit board 100 in fig. 5 is provided with the jig 100, and during testing, the second connection terminal 22 of the flexible circuit board 2 is placed in a corresponding clamping position of the jig 100, and the clamping position may be provided with a plurality of contacts, for example, the micro needles 100a shown in fig. 5, and the micro needles 100a correspond to the leads 22a of the connector 221 of the second connection terminal 22. In addition, since the flexible circuit board 2 in this embodiment is further provided with the test line 261 connected to the power circuit 31, and the test port of the test line 261 is also provided at the second connection terminal 22, the jig 100 in fig. 5 is also provided with a power signal test contact connected to the test circuit board 100c, specifically, the jig is added with the power signal test micro-needle 100b communicating with the test circuit board. When the flexible circuit board 2 is clamped, the clamp can press the flexible circuit board 2 through the cover plate, the flexible circuit board 2 generally can be provided with the reinforcing sheet 28 at the connecting end, and then the cover plate can press the reinforcing sheet 28, so that the pin 22a of the connecting piece 221 of the second connecting end 22 can be fully contacted with the micro-needle 100a, the testing port 22b and the corresponding power supply signal testing micro-needle 100b, and the connection effect is ensured.

After the second connection end 22 of the flexible circuit board 2 is clamped, the plurality of pins 22a of the connection part 221 of the second connection end 22 of the flexible circuit board 2 and the test port of the second connection end 22 are respectively connected with the test circuit board 100c of the fixture 100 through the corresponding micro-needles and the power signal test micro-needles, and then the test circuit board 100c can be powered on and execute corresponding software programs, so that the required functionality test can be performed on the display screen 4 monomer.

Specifically, as shown in fig. 3, the flexible circuit board 2 is provided with at least one group of a bus 27 and a branch line, one end of the branch line is connected to the test port 22b, the other end of the branch line is connected to the first connection end 21, the bus 27 is connected to the third connection end 23 and the branch line, a part of the branch line from the position where the bus 27 is connected to the test port 22b is a test line 261, the test line 261 is connected to the third connection end 23 through the bus 27, and the other part of the branch line is a power signal line 262. During testing, the power signal outputted from the power circuit 31 may flow to the bus 27 through the connection of the third connection terminal 23, and the bus 27 branches to the first connection terminal 21 connected to the display 4 through the power signal line 262 of the branch line and flows to the test port 22b through another branch line (i.e. the test line 261) for testing. That is, the test line 261 and the power supply signal line 262 of the power supply circuit 31 connected to the display panel 4 are parallel lines connected in parallel to the third connection terminal 23, so that the power supply signal of the power supply circuit 31 can be used for both testing and driving the display panel 4. Of course, the arrangement of the T-type lines of the bus line 27 and the branch line is merely an example, and the test line 261 and the power signal line 262 may be connected in parallel, for example, they are directly connected to the third connection terminal 23, and the bus line 27 is not required to be arranged, i.e., a V-type line is formed. In fact, the circuit arrangement may also be designed according to the relative positions of the sub-board 3 and the main board 1 and the display screen 4 and the area size of the flexible circuit board 2, for example, a Y-type circuit may also be used.

In the embodiment, when the flexible circuit board 2 is not tested, the test port 22b is not connected with any external electronic component, and the power supply signal of the connected sub-board 3 is only supplied to the display screen 4.

It can be seen that, during testing, the control signal, the data signal, etc. of the display screen 4 can be supplied through the pin 22a of the connecting part 221 of the second connecting end 22, and the power signal of the display screen 4 can be supplied from the testing port 22b arranged at the second connecting end 22, so that the single data signal, the control signal and the power signal of the display screen 4 can be tested simultaneously through one connecting end of one circuit board, thereby improving the testing efficiency, and when the testing is not required, the circuit board does not need to be changed, the normal use can be realized, and the testing function can be maintained during the normal use. Compared with the scheme in the background art, the test in the embodiment does not need to arrange a switching FPC, and only one second connecting end 22 is clamped to meet the test requirement without clamping two connecting ends.

Referring to fig. 4, in the present embodiment, the connecting element 221 of the second connecting end 22 of the flexible circuit board 2 includes a plurality of pins 22a, and the test line 261 may extend from the side of the connecting element 221 of the second connecting end 22 to the outer side of the connecting element 221. With reference to fig. 3 and 4, it is defined herein that the side of the connecting member 221 facing the first connecting end is an inner side, the side away from the first connecting end is an outer side, and the outer side is closer to the edge of the second connecting end 22; the connector 221 of the second connection terminal 22 includes a plurality of pins 22a arranged in sequence, two sides along the arrangement direction are two sides of the connector 221, a part of the test line 261 is located at the side of the connector 221 of the second connection terminal 22 and extends to the outside of the connector 221, the part of the test line is an end portion of the test line 26, and most of the test line 261 can be located at the side of the entire flexible circuit board 2 according to the form of the flexible circuit board 2 as long as it can be connected to the third connection terminal 23. By such an arrangement, on one hand, the test circuit 261 can be added to the existing flexible circuit board 2, and the existing circuit on the flexible circuit board 2 and the connection of the connecting piece 221 can not be interfered or influenced. Of course, the test line 261 is not limited to this arrangement, and may extend to the inner side of the connector 221, for example, where the extension to the outer side of the connector 221 also facilitates the arrangement of the power signal test microneedle 100b of the fixture.

Furthermore, although a specific number of test lines 261 is shown in fig. 3 and 4, it is obvious that the flexible circuit board 2 may be provided with a plurality of test lines 261 and the number of test lines 261 is not limited, for example, the power supply signal may include 3-5 backlight signals, 2 bias signals, and the corresponding test lines 261 may be 5-7. When the number of the test lines 261 is plural, a part of the test lines 261 may extend from one side of the flexible circuit board 2, another part of the test lines may extend from the other side, or both of the test lines may extend from one side, and may be specifically selected according to the actual number of the test lines 261 and the available area of the flexible circuit board 2.

As shown in fig. 4, the test port 22b in this embodiment is located between the connecting element 221 and the edge of the second connecting end 22, so that the test port 22b can be more easily arranged to the second connecting end 22, especially, the connecting element 221 and the outer edge of the second connecting end 22 have a certain area therebetween, and the test port 22b can be arranged conveniently, that is, the test port 22b is arranged outside the connecting element 221.

Referring to fig. 6, fig. 6 is a second structural diagram of the second connection end 22 of the circuit board in fig. 3.

As shown in fig. 6, the connection unit 221 of the second connection terminal 22 includes a first connection unit 221a for transmitting signals, such as the data signals and the control signals, to the display screen 4, and the test port 22b is disposed near the portion of the connection unit 221 other than the first connection unit 221, that is, the test port 22b of the test line may be as far away from the first connection unit 221 as possible. It can be known that, the first connector 221a is used for transmitting signals of the display screen 4, the pin 22a and the test port 22b of the first connector 221a must be connected to the test circuit board 100c of the fixture, at this time, the distance between the test port 22b and the first connector 221a cannot be too small, and when the second connector 22 is clamped by the fixture, the connection position may be deformed to generate mutual interference when the distance is too small, so that the test port 22b is arranged far away from the first connector 221a, which can increase the distance between the test port 22b and the first connector 221a, reduce the difficulty of fixture design, and avoid test interference between the test port 22b and the pin 22a of the first connector 221 a.

Specifically, in fig. 6, the connecting element 221 of the second connecting terminal 22 is divided into a first connecting element 221 and a second connecting element 221, the dividing line X in fig. 6 divides the connecting element 221 into a first connecting element 221a and a second connecting element 221b, and specifically, in this embodiment, the second connecting element 221 is used for transmitting the control signal of the power circuit 31, since the single test of the display screen 4 is performed in this embodiment, it is not necessary to detect the control signal to the power circuit 31, and the test port 22b and the second connecting element 221b are close and do not affect the test result, so the test port 22b is only located between the second connecting element 221 and the outer edge of the second connecting terminal 22. In this embodiment, the part of the connection part 221 other than the first connection part 221a is the second connection part 221b for transmitting the control signal of the power circuit 31, and it is understood that the second connection part 221b is not limited thereto, as long as the area for transmitting the signal other than the signal of the display screen 4 belongs to the second connection part 221b, that is, the signal which does not need to be tested in the single test of the display screen 4 can be classified as belonging to the second connection part 221 b. It should be understood that the closer the edges of the test port 22b and the second connection end 22 are, the further away from the connection element 221, the less interference with the connection element 221, but the closer the test port 22b and the edges are, the more difficult it is to clamp and interface the test port 22b with the clamp, so that in fig. 6 the test port 22b is spaced from the edge of the second connection end 22 to meet the clamping requirements of the clamp, and in addition, is disposed close to the second connection element 221b and away from the first connection element 221 a.

In the above embodiment, the test port 22b is provided at the connection end for connecting with the motherboard 1, and the connection end is the second connection end 22, and the second connection end 22 facilitates the clamping of the clamp 100 in the embodiment shown in fig. 2. It can be known that, when the link that is connected with subplate 3 is convenient for the centre gripping, also can set up the test port on the link that is connected with subplate 3 to the link that awaits measuring with the link that mainboard 1 is connected transfers to the link that is connected with subplate 3, can realize also can obtain the test signal of other links when test equipment is directed against a link test equally. It is understood that the main board 1 and the sub-board 3 are only main and sub-divisions with respect to the arrangement of fig. 2, the sub-board 3 is mainly arranged with the power circuit 31 in fig. 2, and the main board 1 is arranged with the SOC & PMU chip 11, so that a circuit board element arranged with a processor such as the SOC & PMU chip is defined as the main board 1. It can be known that the main board 1 and the sub-board 3 are both circuit board elements and play a role in controlling and supplying power, obviously, there are many chip structural forms and arrangement modes for realizing control and power supply in the circuit board elements, and there is no main component or sub-component in the two circuit board elements, or the circuit board element at the position of the sub-board 3 in fig. 2 may also be adjusted to be the main board, the circuit board element at the position of the main board 1 may also be adjusted to be the sub-board, or the main board 1 and the sub-board 2 may also be one board, which is not limited in this application.

In the embodiment of the present application, the electronic component connected to at least one connection end of the circuit board 2 may be a component to be tested, the connection end connected to the component to be tested is a first connection end 21, one first connection end 21 is provided in the embodiment of fig. 2, the component to be tested is the display screen 4, and the electronic component connected to other connection ends (connection ends except the first connection end 21) of the circuit board 2 may be a circuit board element, so that connections among the electronic components, between the electronic component and the component to be tested can be formed through the circuit board 2. The connection end connected with the part to be tested is defined as a first connection end 21, one or more or all of the other connection ends connected with the first connection end 21 are second connection ends provided with test ports, when the single part to be tested is tested, when signals of other connection ends connected with the first connection end need to be obtained, the second connection end can be tested, and the signals to be tested of the other connection ends can be transferred to the test ports of the corresponding second connection ends through test circuits.

As shown in fig. 7, fig. 7 is a schematic diagram of the connection between the first circuit board element 1 ', the second circuit board element 3 ', the first part to be tested 4 ', and the second part to be tested 5 of the electronic device according to the second embodiment of the present application through the circuit board 2. I.e. the circuit board 2 in this embodiment is provided with four connection terminals, with two first connection terminals for connection to the component to be tested, a first connection terminal 21 and a first connection terminal 29, respectively, the second connection terminal 22 being provided with a test port, the third connection terminal 23 being connected to a circuit 31 'of the second circuit board element 3', from which it can be seen, compared to fig. 2, the embodiment of fig. 7 adds a second component to be tested 5, the circuits 11 ', 31 ' of the two circuit board elements transmitting power/signals to the second component to be tested 5 in addition to the first component to be tested 4 ', wherein the circuit 11 'is connected to the first connection terminal 21 via the line 25 and to the first connection terminal 29 via the line 210, and the circuit 31' is connected to the first connection terminal 21 via the bus line 27 and the branch line 262 and to the first connection terminal 29 via the bus line 27 'and the branch line 262'. At this time, if it is necessary to test the second part to be tested 5, besides the test port 22b corresponding to the first part to be tested 4 ', a test port 22 b' corresponding to the second part to be tested 5 may be provided on the second connection terminal 22 shown in fig. 7, and a signal is led out from the second circuit board element 3 'to the second connection terminal 22 through the bus 27' and the test line 261 ', and when the test is not performed, the second circuit board element 3' is normally connected to the first connection terminal 29 through the bus 27 'and the branch line 262'. Likewise, all signal tests of the second test element 5 can be completed by testing only one second connection 22.

It can be known that, taking fig. 7 as an example, more connection ends may also be provided, and some or all of the connection ends may be connected to the first part to be tested 4' and the second part to be tested 5, and when a part to be tested is tested, the connection ends connected to the part to be tested may be all transferred to at least one connection end through a test line, so as to perform a merged test.

Referring to fig. 8 again, fig. 8 is a schematic view of a circuit board 2 in a third embodiment of the present application, shown in fig. 2.

In the above embodiment, at least one connection terminal of the circuit board 2 is connected to a part to be tested, and the other connection terminals are connected to the connection terminal to realize connection with the part to be tested. It can be known that the connection terminal of the circuit board 2 is not necessarily connected to the to-be-tested component, but only used for connecting any electronic component, and at this time, a test port is provided on at least one connection terminal, so that the purpose of omitting a target test connection terminal for testing can be achieved. As shown in fig. 8, the circuit board 2 includes a first connection end 21 and a second connection end 22, the second connection end 22 is provided with a test port 22b, and as long as the test equipment is connected to the second connection end 22, the connection component and the test port of the second connection end 22 can be connected simultaneously, so as to achieve the purpose of testing multiple lines simultaneously.

It can be seen that, according to the connection requirement of the electronic device, the circuit board 2 may have a plurality of connection ends, each connection end is connected to a corresponding electronic element, at least one second connection end provided with a test port is provided, the test port may be connected to other connection ends, and a signal to be tested of other connection ends may be transferred to the second connection end provided with the test port, so that the effect of testing the plurality of connection ends can be achieved only for one connection end.

Referring to fig. 9 and 10 again, fig. 9 is a schematic diagram of a circuit board in an embodiment of the present application;

fig. 10 is a schematic diagram of another circuit board in the embodiment of the present application, and fig. 9 and 10 are schematic cross-sectional views of the circuit board.

In the above embodiment, the circuit board 2 needs to be provided with a test circuit, as shown in fig. 9, the circuit board 2 includes a substrate 2b, a circuit connected to the connecting element is laid on the substrate 2b, for example, a first circuit 25 or a second circuit 24 shown in fig. 2, in this embodiment, a test circuit 261 is further laid on the substrate 2b, and in addition, the circuit board 2 further includes a film layer 2a covering the laid circuit. In fig. 9, the circuit connected to the connector and the test circuit are laid on one base material 2b, and in practice, the circuit board 2 may include a plurality of base materials 2b, and as shown in fig. 10, the test circuit 261 and the circuit connected to the connector may be separately laid on different base layers 2 b. It is understood that the lines connected to the connectors of the connection terminals may be provided on different base layers 2b, and the test lines 261 may be provided on any one layer or on a plurality of layers.

In addition to the circuit board, the present embodiment further provides an electronic product, which includes the circuit board described in any of the above embodiments, and has the same technical effects as the circuit board, and the description thereof is omitted. The electronic product may be, for example, a mobile terminal such as a mobile phone, a wearable device, an in-vehicle device, an Augmented Reality (AR)/Virtual Reality (VR) device, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), or a professional shooting device such as a digital camera, a single-lens reflex/micro-single-lens camera, a sports camera, a pan-tilt camera, or an unmanned aerial vehicle, as long as the electronic product has the display screen 4, and the present scheme is not particularly limited.

The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A circuit board is characterized by comprising a first connecting end and a second connecting end, wherein the first connecting end and the second connecting end are provided with connecting pieces used for connecting corresponding electronic elements, the circuit board further comprises at least one test circuit, the second connecting end is provided with a test port, one end of the test circuit is connected with the test port, and the other end of the test circuit is connected with the connecting pieces of the first connecting end.

2. The circuit board of claim 1, wherein the electronic components connected by the connectors of the first connection terminals are to-be-tested components.

3. The circuit board of claim 2, wherein the part to be tested is a display screen, and the electronic component connected by the connector of the second connection terminal is a printed circuit board.

4. The circuit board according to claim 3, further comprising a third connecting end provided with a connecting member, wherein the printed circuit board connected by the connecting member of the second connecting end is a main board, and the electronic component connected by the connecting member of the third connecting end is a sub-board.

5. The circuit board according to claim 4, wherein the circuit board is provided with at least one group of a main line and a branch line, one end of the branch line is connected with the corresponding test port, the other end of the branch line is connected with the connecting piece of the first connecting end, the main line is connected with the third connecting end and the branch line, the part of the branch line from the position where the main line is connected to the test port is the test line, and the test line is connected with the third connecting end through the main line.

6. The circuit board of claim 4 or 5, wherein the motherboard comprises a processor for providing control signals to the display screen; the sub-board includes a power circuit for supplying power to the display screen.

7. The circuit board of any of claims 1-6, wherein the test port is located between the connector of the second connection end and an edge of the second connection end.

8. The circuit board of any of claims 2-6, wherein the connections of the second connection end include a first connection for connection with the part to be tested and a second connection, the test port being located between the second connection and an edge of the second connection end.

9. The circuit board of any one of claims 1-6, wherein a portion of the test trace is located beside the connector at the second connection end and extends outside of the connector.

10. The circuit board of any one of claims 1-9, wherein the circuit board is a flexible circuit board.

11. The circuit board of any one of claims 1-9, wherein at least one of the first connection end and the second connection end is a BTB connector.

12. An electronic device, characterized in that it comprises at least two electronic components and a circuit board according to any of claims 1-11.

13. The electronic device according to claim 12, wherein the electronic components of the electronic device comprise a display screen, a main board and a secondary board, the main board comprises a processor for providing control signals to the display screen, the secondary board is provided with a power circuit for supplying power to the display screen, the circuit board comprises a third connection end, a connection piece of the first connection end is connected with the display screen, a connection piece of the second connection end is connected with the main board, and a connection piece of the third connection end is connected with the power circuit of the secondary board.

14. The electronic device of claim 13, wherein the display screen is an LCD or OLED display screen, and the power circuit is an LCD driver circuit or an OLED driver circuit.

15. A test method, which is performed by the circuit board of any one of claims 1-14, wherein during the test, the second connection terminal of the circuit board on which the test port is disposed is clamped by a clamp, and the test circuit board of the clamp is simultaneously connected with the connection part of the second connection terminal and the test port for testing.