CN211627787U

CN211627787U - FPC circuit open/short circuit detection circuit, device and system

Info

Publication number: CN211627787U
Application number: CN201922226801.0U
Authority: CN
Inventors: 李鹏程; 刘缘
Original assignee: China Display Optoelectronics Technology Huizhou Co Ltd
Current assignee: China Display Optoelectronics Technology Huizhou Co Ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-10-02
Anticipated expiration: 2029-12-12

Abstract

The utility model discloses a short circuit detection circuitry, device and system are opened to FPC circuit. The FPC circuit open short circuit detection circuit comprises a single chip microcomputer, a first main connector and a first auxiliary connector, wherein the single chip microcomputer is connected with a second auxiliary connector arranged at one end of the tested FPC circuit through the first auxiliary connector, and is also connected with a second main connector arranged at the other end of the tested FPC circuit through the first main connector; the single chip microcomputer sends a first level signal to the first auxiliary connector, receives a second level signal through the first main connector, and judges whether the tested FPC circuit is open or short-circuited according to whether the first level signal is consistent with the second level signal. The two ends of the tested FPC circuit are respectively connected with the first main connector and the first auxiliary connector, and the single chip microcomputer can automatically judge whether the tested FPC circuit is short-circuited or not through the consistency of the sent and received level signals, so that the judgment is convenient, an LED lamp is not needed, and the cost is reduced.

Description

FPC circuit open/short circuit detection circuit, device and system

Technical Field

The utility model relates to the field of electronic technology, especially, relate to a FPC circuit open short circuit detection circuitry, device and system.

Background

With the intense competition of the market, the current electronic consumer products are always developed towards the trend of high screen occupation ratio, lightness and thinness without reducing endurance so as to ensure the advantages of the products. This development has led to the related designs being necessarily compact to take up more space, so that the FPC (Flexible Printed Circuit board) connector connecting the display screen and the main board now plays a role of transmitting not only the display signal but also other non-display signals on the main board. Taking fingerprint identification signal transmission as an example, the FPC connector of the handheld device needs to transmit 9 fingerprint identification signals such as SPI _ MI and SPI _ MO, and when the FPC connector has few tin, continuous tin or short circuit of the FPC line, the circuit is abnormal, resulting in fingerprint failure of the product. Since such signals are numerous and difficult to detect, it is one of the challenges to detect the open/short circuit of the signal line.

The current test scheme is mainly to confirm the open and short circuit conditions of the circuits and among the circuits by connecting LED lamps in series, and because the short circuit needs to be detected, almost every time one circuit is added, one more LED lamp needs to be added. The disadvantages of this solution are: the LED lamp can increase because of the increase of test signal quantity, leads to the cost to rise to because LED is more, lead to producing the easy production line staff and produce fatigue, be difficult for judging the circuit condition.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a short circuit detection circuitry, device and system are opened to FPC circuit aims at solving to a certain extent and detects the higher and difficult technical problem who judges of cost when opening the short circuit of FPC circuit through concatenating the LED lamp among the prior art.

In order to achieve the above object, the present invention provides an open short circuit detection circuit for FPC lines, the circuit includes a single chip, a first main connector and a first auxiliary connector, the single chip is connected to a second auxiliary connector disposed at one end of the FPC line to be tested through the first auxiliary connector, the single chip is further connected to a second main connector disposed at the other end of the FPC line to be tested through the first main connector; the single chip microcomputer is used for sending a first level signal to the first auxiliary connector, receiving a second level signal through the first main connector, and judging whether the tested FPC circuit is open or short-circuited according to the consistency of the first level signal and the second level signal.

Preferably, the first main connector comprises a first non-display interface, the first auxiliary connector comprises a second non-display interface, and the single chip microcomputer comprises a third non-display interface corresponding to the first non-display interface and the second non-display interface; the first non-display interface and the second non-display interface are respectively and correspondingly connected with the third non-display interface.

Preferably, the FPC testing device further comprises an output module, the single chip microcomputer is connected with the display module through the output module, and the output module is used for lighting the display module when the tested FPC circuit is not in open short circuit.

Preferably, the first main connector further includes a first display interface, the output module includes a second display interface, and the first display interface is correspondingly connected to the second display interface.

Preferably, the single chip microcomputer further comprises a first input/output interface, the output module further comprises a second input/output interface, and the first input/output interface is correspondingly connected with the second input/output interface.

Preferably, the single chip microcomputer, the first auxiliary connector, the first main connector and the output module are all arranged on a PCB.

Preferably, the first non-display interface is a fingerprint identification signal interface.

The utility model also provides a short circuit detection device is opened to FPC circuit, FPC circuit open short circuit detection device includes as above FPC circuit open short circuit detection circuitry.

The utility model also provides a short circuit detecting system is opened to FPC circuit, FPC circuit is opened short circuit detecting system and is included as above FPC circuit open short circuit detecting circuit or as above FPC circuit open short circuit detection device.

Preferably, the tested FPC line device includes a tested FPC line, a second sub-connector provided at one end of the tested FPC line, and a second main connector provided at the other end of the tested FPC line.

The utility model discloses a set up singlechip, first main connector and first auxiliary connector in FPC circuit open short circuit detection circuitry, the singlechip is connected with the second auxiliary connector that sets up in the FPC circuit one end of being surveyed through the first auxiliary connector, the singlechip is still connected with the second main connector that sets up in the other end of being surveyed FPC circuit through the first main connector; the single chip microcomputer sends a first level signal to the first auxiliary connector, receives a second level signal through the first main connector, and judges whether the tested FPC circuit is open or short-circuited according to whether the first level signal is consistent with the second level signal. The two ends of the tested FPC circuit are respectively connected with the first main connector and the first auxiliary connector, and the single chip microcomputer can automatically judge whether the tested FPC circuit is short-circuited or not through the consistency of the sent and received level signals, so that the judgment is convenient, an LED lamp is not needed, and the cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a functional block diagram of an embodiment of the FPC line open/short detection circuit of the present invention;

fig. 2 is an alternative structure diagram of the FPC line open short detection circuit of fig. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	PCB board	J1	A first non-display interface
20	Tested FPC circuit equipment	J2	Second non-display interface
				110	Output module	J3	Third non-display interface
A1	First main connector	DISPLAY1	First display interface
				A2	First sub-connector	DISPLAY2	Second display interface
B1	Second main connector	IO1	First input/output interface
				B2	Second sub-connector	IO2	Second input/output interface
FPC	Tested FPC circuit

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a FPC circuit opens short-circuit detection circuitry.

Referring to fig. 1, in an embodiment, the FPC line open short detection circuit includes a single chip IC, a first main connector a1 and a first sub connector a2, the single chip IC is connected to a second sub connector B2 disposed at one end of the FPC line to be tested through the first sub connector a2, and the single chip IC is further connected to a second main connector B1 disposed at the other end of the FPC line to be tested through the first main connector a 1; the single chip microcomputer IC is used for sending a first level signal to the first auxiliary connector A2, receiving a second level signal through the first main connector A1, and judging whether the FPC line to be tested is open or short-circuited according to the fact whether the first level signal and the second level signal are consistent.

It should be noted that, in this embodiment, the single chip microcomputer IC sends the first level signal and receives the second level signal, and whether the first level signal is consistent with the second level signal or not is determined, so that whether the FPC of the tested FPC line is open or short-circuited can be quickly determined. Specifically, when the first level signal is consistent with the second level signal, the FPC of the FPC line to be tested may be determined to be normal, and when the first level signal is inconsistent with the second level signal, the FPC of the FPC line to be tested may be determined to be open or short. If the first level is 1 high level and the second level is 1 high level, the FPC line to be tested is judged to be normal, if the first level is 1 high level and the second level is not high level, the FPC line to be tested is judged to be open-circuited, and if the first level is 1 high level and the second level is 2 high levels, the FPC line to be tested is judged to be short-circuited.

Further, the FPC line open/short circuit detection circuit may further include an output module 110, the single chip microcomputer IC is connected to a display module (not shown) through the output module 110, and the output module 110 is configured to light the display module when the FPC line to be tested does not have an open/short circuit.

In this embodiment, the output module 110 may be a fixture for fixing the display module, and the display module may be a display screen or other display devices, which is not limited in this embodiment.

In specific implementation, when the single chip microcomputer IC determines that the FPC of the tested FPC line is open or short, a level signal is output to the output module 110, and the output module 110 stops supplying power to the display module when detecting the level signal, so that the detection result is displayed more intuitively. Taking the example that the first level output by the single chip microcomputer IC is 1 high level, if the second level detected by the single chip microcomputer IC is 1 high level, it is determined that the FPC of the tested FPC is normal, the single chip microcomputer IC outputs a low level signal to the output module 110, and the output module 110 lights up the display module when detecting the low level signal; if the second level detected by the single chip microcomputer IC is a low level or 2 high levels, the open circuit or short circuit of the tested FPC line is correspondingly determined, the single chip microcomputer outputs a high level signal to the output module 110, and the output module 110 stops supplying power to the display module when detecting the high level signal, so that a user can determine whether the short circuit or open circuit of the tested FPC line is determined through the on/off of the display module.

Furthermore, for the convenience of testing, the single chip IC, the first sub-connector a2, the first main connector a1 and the output module 110 may be all disposed on the PCB 10, and during testing, it is only necessary to connect the first sub-connector a2 on the PCB 10 to the second sub-connector B2 of the FPC line device 20 to be tested, and to connect the first main connector a1 to the second main connector B1 of the FPC line device 20 to be tested.

Further, referring to fig. 2, fig. 2 is a schematic diagram of an optional structure of the FPC line open/short detection circuit of fig. 1.

In this embodiment, the first main connector a1 includes a first non-display interface J1, the first sub connector a2 includes a second non-display interface J2, and the single chip microcomputer IC includes a third non-display interface J3 corresponding to the first non-display interface J1 and the second non-display interface J2; the first non-display interface J1 and the second non-display interface J2 are correspondingly connected to the third non-display interface J3, respectively.

It is understood that the non-display interface refers to an interface other than the display interface, and may be a fingerprint identification signal interface, a USB charging interface, or other interface.

It should be noted that the pins on the first non-display interface J1 need to completely correspond to the pins on the second non-display interface J2 one to one, and are connected to the corresponding pins of the third non-display interface J3 on the single chip IC. Taking the first non-display interface J1 as an example of a fingerprint identification signal interface, since the FPC to be tested needs to transmit 9 fingerprint identification signals such as SPI _ MI and SPI _ MO, pins a1 to a9 for transmitting these signals are provided on the first non-display interface J1, pins b1 to b9 for transmitting these signals are provided on the second non-display interface J2, and pins a1 to a9 and pins b1 to b9 are provided on the third non-display interface J3 of the single chip IC. Wherein a1 corresponds to b1, a2 corresponds to b2, and so on, which are not described herein again.

Further, the first main connector a1 further includes a first DISPLAY interface DISPLAY1, the output module 110 includes a second DISPLAY interface DISPLAY2, and the first DISPLAY interface DISPLAY1 is correspondingly connected to the second DISPLAY interface DISPLAY 2.

It should be noted that the display interface includes one or more signal interfaces of VGA, DVI, HDMI, USB, and the like, which is not limited in this embodiment.

Further, the single chip microcomputer IC further includes a first input/output interface IO1, the output module 110 further includes a second input/output interface IO2, and the first input/output interface IO1 is correspondingly connected to the second input/output interface IO 2.

In a specific implementation, both the first input/output interface IO1 and the second input/output interface IO2 may be INT interfaces, or may be other interfaces having input/output functions. The single chip IC may transmit the level signal to the output module 110 through the first input/output interface IO1 and the second input/output interface IO2, so that the output module 110 performs the next action. When the level signal received by the output module 110 indicates that the FPC line of the tested FPC is normal (i.e. no open short circuit occurs), the DISPLAY signal received by the second DISPLAY interface DISPLAY2 is sent to the DISPLAY module for DISPLAY.

The first non-display interface on the first main connector and the second non-display interface on the first auxiliary connector are connected with the corresponding third non-display interface on the single chip microcomputer, the judged level signal is sent to the output module through the first input/output port of the single chip microcomputer, the normal display is performed when the tested FPC circuit is normal, and the power supply to the display module is stopped when the tested FPC circuit is opened and short-circuited, so that a user can obtain a detection result more intuitively, and the operability of a product is improved.

The utility model also provides a FPC circuit open short circuit detection device, FPC circuit open short circuit detection device includes FPC circuit open short circuit detection circuit as above-mentioned, the circuit structure of FPC circuit open short circuit detection circuit of FPC circuit open short circuit detection device can refer to above-mentioned embodiment, and no longer elaborates here; it can be understood that, since the FPC line open/short detection device of this embodiment adopts the technical scheme of the above FPC line open/short detection circuit, the FPC line open/short detection device has all the above beneficial effects.

The utility model also provides a FPC circuit short-circuit detection system that opens, FPC circuit short-circuit detection system that opens includes the FPC circuit of being surveyed and FPC circuit short-circuit detection circuit or FPC circuit short-circuit detection device that opens as above, FPC circuit short-circuit detection system's FPC circuit short-circuit detection circuit that opens can refer to above-mentioned embodiment's circuit structure, and it is no longer repeated here; it can be understood that, since the FPC line open/short circuit detection system of this embodiment adopts the technical scheme of the above FPC line open/short circuit detection circuit or the above FPC line open/short circuit detection device, the FPC line open/short circuit detection system has all the above beneficial effects.

Further, referring back to fig. 1, the FPC line device 20 includes an FPC line, a second sub-connector B2 disposed at one end of the FPC line, and a second main connector B1 disposed at the other end of the FPC line.

It should be understood that the second sub-connector B2 may further have an interface corresponding to the second non-DISPLAY interface J2 of the first sub-connector a2, and the second main connector B1 may further have interfaces corresponding to the first non-DISPLAY interface J1 and the first DISPLAY interface DISPLAY1 of the first main connector a1, so as to ensure that each signal of the FPC line to be tested is detected, and improve the accuracy of the detection result.

In the embodiment, the tested FPC circuit equipment comprises a tested FPC circuit, a second auxiliary connector arranged at one end of the tested FPC circuit and a second main connector arranged at the other end of the tested FPC circuit; the second sub-connector is connected to the first sub-connector, and the second main connector is connected to the first main connector. The structure characteristic of the existing FPC circuit equipment to be detected is utilized to carry out open short circuit detection on the circuit, so that the cost increase caused by the use of an LED lamp is avoided, and the detection efficiency and the detection result accuracy are improved.

The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The FPC circuit open short circuit detection circuit is characterized by comprising a single chip microcomputer, a first main connector and a first auxiliary connector, wherein the single chip microcomputer is connected with a second auxiliary connector arranged at one end of a tested FPC circuit through the first auxiliary connector; the single chip microcomputer is used for sending a first level signal to the first auxiliary connector, receiving a second level signal through the first main connector, and judging whether the tested FPC circuit is open or short-circuited according to the consistency of the first level signal and the second level signal.

2. The FPC line open short detection circuit of claim 1, wherein the first main connector comprises a first non-display interface, the first sub-connector comprises a second non-display interface, and the single chip microcomputer comprises a third non-display interface corresponding to the first non-display interface and the second non-display interface; the first non-display interface and the second non-display interface are respectively and correspondingly connected with the third non-display interface.

3. The FPC line open short circuit detection circuit of claim 2, further comprising an output module, wherein the single chip is connected to a display module through the output module, and the output module is configured to light the display module when the FPC line under test is not open-short circuited.

4. The FPC line open short detection circuit of claim 3, wherein the first main connector further comprises a first display interface, the output module comprises a second display interface, and the first display interface is correspondingly connected with the second display interface.

5. The FPC circuit open short circuit detection circuit of claim 4, wherein the single chip further comprises a first input/output interface, the output module further comprises a second input/output interface, and the first input/output interface is correspondingly connected to the second input/output interface.

6. The FPC line open short circuit detection circuit of claim 5, wherein the single chip, the first sub connector, the first main connector and the output module are all disposed on a PCB.

7. The FPC line open short detection circuit of any of claims 2-6, wherein the first non-display interface is a fingerprint identification signal interface.

8. An FPC line open/short circuit detection device, comprising the FPC line open/short circuit detection circuit as claimed in any one of claims 1 to 7.

9. An FPC line open/short detection system, characterized in that the system comprises a tested FPC line device and an FPC line open/short detection circuit as claimed in any one of claims 1-7 or an FPC line open/short detection device as claimed in claim 8.

10. The FPC line open/short detection system of claim 9, wherein the FPC line device under test comprises an FPC line under test, a second sub-connector provided at one end of the FPC line under test, and a second main connector provided at the other end of the FPC line under test.