CN107688143A - A kind of flexible PCB detection circuit, flexible PCB and its detection method - Google Patents
A kind of flexible PCB detection circuit, flexible PCB and its detection method Download PDFInfo
- Publication number
- CN107688143A CN107688143A CN201710762728.1A CN201710762728A CN107688143A CN 107688143 A CN107688143 A CN 107688143A CN 201710762728 A CN201710762728 A CN 201710762728A CN 107688143 A CN107688143 A CN 107688143A
- Authority
- CN
- China
- Prior art keywords
- enable signal
- flexible pcb
- alarm signal
- detection line
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The embodiment of the present invention provides a kind of flexible PCB detection circuit, flexible PCB and its detection method, is related to electronic unit detection technique field, the fracture to flexible PCB periphery is bad to be detected.Flexible PCB detection circuit includes the first enable signal generation module, the second enable signal generation module, the first alarm signal output module, the second alarm signal output module.First enable signal generation module generates the first enable signal according to the voltage of the voltage in detection line, the first reference voltage terminal；First alarm signal output module exports the first alarm signal according to the first enable signal under the control at the second supply voltage end；Second enable signal generation module generates the second enable signal according to the voltage of the voltage in detection line, the second reference voltage terminal；Second alarm signal output module exports the second alarm signal according to the second enable signal under the control at the second supply voltage end.Flexible PCB detection circuit is used to detect flexible PCB.
Description
Technical field
The present invention relates to electronic unit detection technique field, more particularly to a kind of flexible PCB detection circuit, flexible electrical
Road plate and its detection method.
Background technology
Flexible PCB (Flexible Printed Circuit, FPC) is using polyimides or polyester film as base material
A kind of manufactured flexible printed circuit with height reliability.FPC has that bent, Distribution density is high, in light weight, thick
The characteristics of thin is spent, is mainly used on the electronic products such as mobile phone, notebook computer, digital camera.
In process of production, FPC periphery is typically the most weak positions of the FPC, in the prior art, to above-mentioned electronics
When product is assembled, the tear of flexible PCB periphery or fracture are easily caused, and because small tear is difficult with the naked eye
It was observed that so as to cause the part for being provided with the flexible PCB being damaged to enter next workshop section, and bad hidden danger is caused,
Reduce the yield of product.
The content of the invention
Embodiments of the invention provide a kind of flexible PCB detection circuit, flexible PCB and its detection method, can
Fracture to flexible PCB periphery is bad to be detected.
To reach above-mentioned purpose, embodiments of the invention adopt the following technical scheme that：
The one side of the embodiment of the present invention, there is provided a kind of flexible PCB detects circuit, for being carried out to flexible PCB
Detection, the flexible PCB periphery are provided with detection line, and one end of the detection line is used to connect the first supply voltage end；Institute
Stating flexible PCB detection circuit includes the first enable signal generation module, the second enable signal generation module, the first alarm signal
Number output module and the second alarm signal output module；The first enable signal generation module connects the another of the detection line
One end and the first reference voltage terminal；The first enable signal generation module be used for according to the voltage in the detection line and
The voltage of first reference voltage terminal generates the first enable signal；The first alarm signal output module makes with described first
Energy signal generation module is connected with the second supply voltage end；The first alarm signal output module is used for according to described first
Enable signal, the first alarm signal is exported under the control at the second supply voltage end；Second enable signal generates mould
Block connects the other end and the second reference voltage terminal of the detection line；The second enable signal generation module is used for according to institute
The voltage for stating the voltage in detection line and second reference voltage terminal generates the second enable signal；Second alarm signal
Output module and the second enable signal generation module and the second supply voltage end；Second alarm signal exports mould
Block is used for according to second enable signal, and the second alarm signal is exported under the control at the second supply voltage end.
Preferably, the first enable signal generation module includes first comparator；The first comparator it is same mutually defeated
Enter end and connect first reference voltage terminal, inverting input is connected with the detection line, the output of the first comparator
End is connected with the first alarm signal output module.
Preferably, the first alarm signal output module includes first switch transistor and the first luminescent device；It is described
The grid of first switch transistor connects the first enable signal generation module, and the first pole connects second supply voltage
End, the second pole is connected with the anode of first luminescent device；The power supply electricity of negative electrode connection the 3rd of first luminescent device
Pressure side；Wherein, the voltage at the 3rd supply voltage end is less than the voltage at the second supply voltage end.
It is further preferred that the first alarm signal output module also includes first resistor；The one of the first resistor
End is connected with the second pole of the first switch transistor, and the other end connects the anode of first luminescent device.
Preferably, the second enable signal generation module includes the second comparator；Second comparator it is same mutually defeated
Enter end and connect second reference voltage terminal, inverting input is connected with the detection line, the output of second comparator
End is connected with the second alarm signal output module.
Preferably, the second alarm signal output module includes second switch transistor and the second luminescent device；It is described
The grid of second switch transistor connects the second enable signal generation module, and the first pole connects second supply voltage
End, the second pole is connected with the anode of second luminescent device；The power supply electricity of negative electrode connection the 3rd of second luminescent device
Pressure side；Wherein, the voltage at the 3rd supply voltage end is less than the voltage at the second supply voltage end.
It is further preferred that the second alarm signal output module also includes second resistance；The one of the second resistance
End is connected with the second pole of the second switch transistor, and the other end connects the anode of second luminescent device.
The another aspect of the embodiment of the present invention, there is provided one kind is using any one flexible PCB detection electricity as described above
The flexible PCB that road is detected, connector, the detection on the flexible PCB periphery are provided with the flexible PCB
The both ends of line detect circuit with the flexible PCB by the connector respectively and the first supply voltage end is connected.
Preferably, the line width of the detection line is 0.15mm~0.25mm.
The another further aspect of the embodiment of the present invention, there is provided one kind is using any one flexible PCB detection electricity as described above
The method that road is detected to flexible PCB, methods described include：By one end of the detection line on the flexible PCB periphery
The first supply voltage end is connected, the other end of the detection line is connected with flexible PCB detection circuit；First makes
Energy signal generation module generates the first enable signal according to the voltage in the detection line and the first reference voltage terminal；First report
Alert signal output module is used for according to first enable signal, and the first alarm signal is exported under the control at the second supply voltage end
Number；Second enable signal generation module is according to the second enabled letter of the voltage in the detection line and the generation of the second reference voltage terminal
Number；Second alarm signal output module exports according to second enable signal under the control at the second supply voltage end
Second alarm signal；Wherein, the voltage of first reference voltage terminal is different from the voltage of second reference voltage terminal, and works as
When the detection line does not occur to be broken completely or partially, voltage in the detection line and first reference voltage terminal and described
It is identical that larger voltage is exported in second reference voltage terminal.
From the foregoing, the embodiment of the present invention provides a kind of flexible PCB detection circuit, flexible PCB and its detection
Method.Wherein, the first enable signal generation module can be according to the voltage in detection line in above-mentioned flexible PCB detection circuit
And first reference voltage terminal voltage generate the first enable signal；Second enable signal generation module can be according in detection line
Voltage and the second reference voltage terminal voltage generate the second enable signal.In the case, when flexible PCB periphery is sent out
During raw tear, the resistance of above-mentioned detection line can be changed so that the voltage in detection line changes.And the voltage in detection line
It is sized to determine whether the first enable signal generation module and the second enable signal generation module can export above-mentioned enabled letter
Number, so as to further determine whether the first alarm signal output module and the second alarm signal output module can export
State alarm signal.So, the breaking degree on flexible PCB periphery can be sentenced by the alarm signal received
It is disconnected.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of FPC provided in an embodiment of the present invention structural representation；
Fig. 2 is the structural representation that a kind of FPC provided in an embodiment of the present invention detects circuit；
Fig. 3 is the concrete structure schematic diagram of modules in Fig. 2；
Fig. 4 is the workflow diagram detected using the FPC detection circuits shown in Fig. 2 or Fig. 3 to FPC；
Fig. 5 is FPC provided in an embodiment of the present invention another structural representation；
Fig. 6 is a kind of method flow diagram detected to FPC provided in an embodiment of the present invention；
Fig. 7 is the schematic diagram of first comparator and the second comparator output voltage in Fig. 3.
Reference：
100- detection lines；200- connectors；10- the first enable signal generation modules；101- first comparators；20- second
Enable signal generation module；The comparators of 102- second；30- the first alarm signal output modules；The alarm signals of 40- second export mould
Block.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of FPC detections circuit, and FPC detection circuits are used for the breaking degree to FPC peripheries
Detected.Wherein, as shown in figure 1, above-mentioned FPC periphery is provided with detection line 100.One end of the detection line 100 is used to connect
The first supply voltage end ELVDD is met, the other end is connected with above-mentioned FPC detection circuits.Wherein, the first supply voltage end ELVDD
As power supply, constant high level can be provided.
It should be noted that above-mentioned detection line 100 is set one week along FPC peripheries, and detection line 100 and FPC edge
Distance H is between 0.05~0.15mm, it is preferred that above-mentioned distance H is 0.1mm.So, manufacture craft difficulty is not being increased
On the basis of, above-mentioned detection line 100 can have a certain distance between other electric conduction routings inside FPC, so that will not be right
Electric conduction routing impacts.Wherein, above-mentioned electric conduction routing is used to be connected with external circuit.
In addition, in order to simplify manufacture craft, it is preferred that can be when making above-mentioned detection line 100, by the detection line 100
Set with any one electric conduction routing inside the FPC with layer with material.
On this basis, as shown in Fig. 2 FPC detection circuits are enabled including the first enable signal generation module 10, second
Signal generation module 20, the first alarm signal output module 30 and the second alarm signal output module 40.
Specifically, the other end of the connecting detection line 100 of the first enable signal generation module 10.In the case, detection line
Voltage V on 100inIt can input into the first enable signal generation module 10.In addition, above-mentioned first enable signal generation mould
Block 10 is also connected with the first reference voltage terminal VR1.The first enable signal generation module 10 is used for according to the voltage in detection line 100
VinAnd the first reference voltage terminal VR1Voltage generate the first enable signal CN1.
In addition, the first alarm signal output module 30 and the first enable signal generation module 10 and the second supply voltage end
VHIt is connected.The first alarm signal output module 30 is used for according to the first enable signal CN1, in the second supply voltage end VH's
Control the first alarm signal of lower output.
On this basis, the second enable signal generation module 20 connects the other end of above-mentioned detection line.In the case, examine
Voltage V on survey line 100inIt can input into the second enable signal generation module 20.In addition, above-mentioned second enable signal life
The second reference voltage terminal V is also connected with into module 20R2.The second enable signal generation module 20 is used for according in detection line 100
Voltage VinAnd the second reference voltage terminal VR2Voltage generate the second enable signal CN2.
In addition, the second alarm signal output module 40 and the second enable signal generation module 20 and the second supply voltage end
VH.The second alarm signal output module 40 is used for according to the second enable signal CN2, in the second supply voltage end VHControl under
Export the second alarm signal.
From the foregoing, the first enable signal generation module 10 can be according in detection line 100 in above-mentioned FPC detections circuit
Voltage VinAnd the first reference voltage terminal VR1Voltage generate the first enable signal CN1；Second enable signal generation module 20
Can be according to the voltage V in detection line 100inAnd the second reference voltage terminal VR2Voltage generate the second enable signal CN2.
In this case, when FPC peripheries occur tear and cause detection line 100 to tear, the electricity of above-mentioned detection line 100 can be changed
Resistance so that the voltage V in detection line 100inChange.And the voltage V in detection line 100inBe sized to determine that first makes
Whether energy signal generation module 10 and the second enable signal generation module 20 can export above-mentioned enable signal, so as to enter one
Step determines whether the first alarm signal output module 30 and the second alarm signal output module 40 can export above-mentioned alarm signal.
So, testing staff can be judged the breaking degree on FPC peripheries by the alarm signal received.
For example, when FPC peripheries are not torn, when detection line 100 stands intact, the voltage V in above-mentioned detection line 100inIt is equal to
Or it is slightly less than the first supply voltage end ELVDD voltage.Now, by setting the first reference voltage terminal VR1, the second reference voltage
Hold VR2And the voltage V in detection line 100inSize so that the first enable signal generation module 10 and the second enable signal life
Exported into module 20 without enable signal.In the case, the first alarm signal output module 30 and the second alarm signal output mould
The no alarm signal of block 40 exports., can be with when testing staff can not receive above-mentioned first alarm signal and the second alarm signal
Judge that the FPC peripheries are not torn.
Or in another example, when slight tear occurs for FPC peripheries, cause the slightly fracture but still can of the part of detection line 100
During conducting, the resistance of the detection line 100 increases, the voltage V in above-mentioned detection line 100inFurther reduce.Now, setting is passed through
First reference voltage terminal VR1, the second reference voltage terminal VR2And the voltage V in detection line 100inSize, first can be caused
Enable signal can be exported by there was only one in the enable signal generation module 20 of enable signal generation module 10 and second.In this situation
Under, alarm signal can be exported by also there was only one in the first alarm signal output module 30 and the second alarm signal output module 40
Number.When testing staff can receive the first alarm signal or the second alarm signal, it can be determined that go out the FPC peripheries and occur gently
Micro- tear.
For another example when serious tear occurs for FPC peripheries, when causing the detection line 100 to be broken completely, in above-mentioned detection line 100
Voltage VinFor 0.Now, by setting the first reference voltage terminal VR1, the second reference voltage terminal VR2And in detection line 100
Voltage VinSize so that the first enable signal generation module 10 export the first enable signal CN1, the second enable signal generation mould
Block 20 exports the second enable signal CN2.In the case, the first alarm signal output module 30 can export the first alarm signal
Number, and the second alarm signal output module 40 can export the second alarm signal.When testing staff receives above-mentioned first alarm
When signal and the second alarm signal, it can be determined that go out the FPC peripheries and serious tear occurs.
It should be noted that FPC detections circuit provided in an embodiment of the present invention can be in the FPC production phases to the FPC's
Periphery tear(ing) strength is detected；Or can also be after FPC and electronic product such as display panel binding, in product
The module group assembling stage is detected to the FPC；Or can also be in the electronic product stage after sale to being bound to the electronic product mould
FPC in group is detected.
The concrete structure of modules in FPC detection circuits as shown in Figure 2 is described in detail below.
Specifically, as shown in figure 3, the first enable signal generation module 10 includes first comparator 101.Wherein, this first
The in-phase input end of comparator 101 connects the first reference voltage terminal VR1, the inverting input and detection line of first comparator 101
100 are connected, and the output end of first comparator 101 is connected with the first alarm signal output module 30.In the case, it is above-mentioned
Voltage V in detection line 100inExport to the inverting input of the first comparator 101.
Based on this, the first alarm signal output module 30 includes first switch transistor M1 and the first luminescent device L1.Its
In, first switch transistor M1 grid connects the first enable signal generation module 10, and the first pole connects the second supply voltage end
VH, the second pole is connected with the first luminescent device L1 anode.
In addition, first luminescent device L1 negative electrode connects the 3rd supply voltage end.Wherein, above-mentioned 3rd supply voltage end
Voltage be less than the second supply voltage end VHVoltage.Specifically, above-mentioned second supply voltage end VHConstant height electricity can be exported
It is flat, and the 3rd supply voltage end can be illustrated in figure 3 earth terminal or export constant low level.
From the foregoing, when the structure of the first enable signal generation module 10 is as described above, the first switch transistor
M1 grid is connected with the output end of first comparator 101.
On this basis, above-mentioned first alarm signal output module 30 also includes first resistor R1.First resistor R1's
One end is connected with first switch transistor M1 the second pole, and the other end connects the first luminescent device L1 anode.So,
By above-mentioned first resistor R1 filter action, the second supply voltage end V can be reducedHThe noise of output signal.
In addition, the second enable signal generation module 20 includes the second comparator 102.Second comparator 102 it is same mutually defeated
Enter the second reference voltage terminal V of end connectionR2, the inverting input of the second comparator 102 is connected with detection line 100, second ratio
Output end compared with device 102 is connected with the second alarm signal output module 40.In the case, the electricity in above-mentioned detection line 100
Press VinExport to the inverting input of second comparator 102.
Based on this, the second alarm signal output module 40 includes second switch transistor M2 and the second luminescent device L2.
Wherein, second switch transistor M2 grid connects the second enable signal generation module 20, the first pole connection second
Supply voltage end VH, the second pole is connected with the second luminescent device L2 anode.In second luminescent device L2 negative electrode connection
State the 3rd supply voltage end.
It should be noted that above-mentioned first luminescent device L1 and the second luminescent device L2 can be OLED (Organic
Light Emitting Diode, Organic Light Emitting Diode) or LED (Light Emitting Diode, light emitting diode).
In addition, the optical signal that above-mentioned first luminescent device L1 is sent is above-mentioned first alarm signal, and the second luminescent device
The optical signal that L2 is sent is above-mentioned second alarm signal.Wherein, distinguished for the ease of testing staff, the first luminescent device L1 and the
The color that two luminescent device L2 emit beam can differ.Such as first luminescent device L1 send feux rouges, the second luminescent device
L2 sends green glow.
Or the first luminescent device L1 and the second luminescent device L2 negative electrodes electric current can also be acquired respectively, with
Obtain above-mentioned first alarm signal and the second alarm signal.But for the ease of detection, it is preferred that by above-mentioned first luminescent device
The optical signal that L1 and the second luminescent device L2 are sent is respectively as above-mentioned first alarm signal and the second alarm signal.
In addition, above-mentioned first switch transistor M1 and second switch transistor M2 can be N-type transistor, or it is p-type
Transistor.The present invention is not limited this.Following examples are with first switch transistor M1 and second switch transistor M2
For the explanation carried out exemplified by N-type transistor.In the case, the first of above-mentioned transistor extremely drains, the second extremely source electrode.
From the foregoing, when the structure of the second enable signal generation module 20 is as described above, the second switch transistor
M2 grid is connected with the output end of the second comparator 102.
On this basis, in order to reduce the second supply voltage end VHThe noise of output signal, it is preferred that above-mentioned second alarm
Signal output module 40 also includes second resistance R2.Second resistance R2 one end and second switch transistor M2 the second pole phase
Connection, the other end connect the second luminescent device L2 anode.
Similarly, in order to reduce the first reference voltage terminal VR1The noise of output signal, it is preferred that the first enable signal generates mould
Block 10 also includes the 3rd electric capacity R3, and the 3rd electric capacity R3 one end connects the first reference voltage terminal VR1, the other end is compared with first
The in-phase input end of device 101 is connected.In addition, in order to reduce the second reference voltage terminal VR2The noise of output signal, it is preferred that the
Two enable signal generation modules 20 also include the 4th electric capacity R4, and the 4th electric capacity R4 one end connects the second reference voltage terminal VR2,
The other end is connected with the in-phase input end of the second comparator 102.
Wherein, resistance of the present invention to above-mentioned first electric capacity R1, the second electric capacity R2, the 3rd electric capacity R3 and the 4th electric capacity R4
Do not limit.Those skilled in the art can be set as needed.
On this basis, in order that obtaining the voltage V in detection line 100inCan stably it export to the He of first comparator 101
The inverting input of second comparator 102, it is preferred that above-mentioned FPC detections circuit also includes storage capacitance Cst as shown in Figure 3,
Storage capacitance Cst one end is connected with detection line 100, and the other end is connected with earth terminal.
The detection process for detecting circuit to the FPC shown in Fig. 3 below is described in detail.
Specifically, the upper electricity of step S101, FPC as shown in Figure 4 is first carried out, i.e., by the above-mentioned detection line 100 on FPC
One end is connected with the first supply voltage end ELVDD, the other end and first comparator 101 and second in above-mentioned FPC detection circuits
The inverting input of comparator 102 is connected.
Next, performing step S102, FPC is detected.
It should be noted that before testing, it is necessary to the first reference voltage terminal VR1, the second reference voltage terminal VR2And
Voltage V in detection line 100inSize be defined.Wherein, the first reference voltage terminal VR1With the second reference voltage terminal VR2No
Together.For example, with the first reference voltage terminal VR1More than the second reference voltage terminal VR2Exemplified by.On this basis, setting is when on FPC
When detection line does not occur partially or completely to be broken, the voltage V in detection line 100inWith the first reference voltage terminal VR1It is equal.
Based on this, when FPC peripheries are not torn, and detection line 100 stands intact, the first reference voltage terminal VR1, the second benchmark
Voltage end VR2And the voltage V in detection line 100inMagnitude relationship be：Vin=VR1>VR2。
In the case, the voltage V of the output end output of first comparator 101o1(it is located at time shaft t in Fig. 7 for low level
The voltage of lower section), now, the first switch transistor M1 being connected with the output end of the first comparator 101 is in cut-off shape
State.The voltage V of the output end output of second comparator 102o2Also it is low level, now, the output end with second comparator 102
The second switch transistor M2 being connected is also at cut-off state.Based on this, the first luminescent device L1 and the second luminescent device L2
Do not light, so the first alarm signal output module 30 and the second alarm signal output module 40 not output alarm signal.
In this case, it is possible to judge that FPC peripheries do not tear or be broken bad, can continue executing with step S103, enter
Enter lower segment process.
Or when slight tear occurs for FPC peripheries, causes the slight fracture in the part of detection line 100 but still can turn on,
The resistance of the detection line 100 increases the voltage V in above-mentioned detection line 100inFurther reduce.Now, the first reference voltage terminal
VR1, the second reference voltage terminal VR2And the voltage V in detection line 100inMagnitude relationship be：VR1>Vin＞ VR2。
In the case, the voltage V of the output end output of first comparator 101o1(it is located at time shaft t in Fig. 7 for high level
The voltage of top), the high level is as above-mentioned first enable signal CN1, so that first switch transistor M1 is turned on, first
Luminescent device L1 lights, and exports the first alarm signal.And the output end output low level of the second comparator 102, second switch are brilliant
Body pipe M2 ends, and the second luminescent device L2 does not light, and does not export the second alarm signal.Based on this, testing staff can observe
The first alarm signal that first luminescent device L1 is sent, to complete the step S104 in Fig. 4, so as to judge above-mentioned FPC
Periphery exist slightly tear it is bad.Testing staff carries out NG operations to FPC detection circuits, and performs step S105 to the FPC
Detected.
Or when serious tear occurs for FPC peripheries, when causing the detection line 100 to be broken completely, in above-mentioned detection line 100
Voltage VinFor 0.Now, the first reference voltage terminal VR1, the second reference voltage terminal VR2And the voltage V in detection line 100in's
Magnitude relationship is：Vin=0<VR2<VR1。
In the case, first comparator 101 exports high level, and the high level makes as above-mentioned first enable signal CN1
Obtain first switch transistor M1 conductings.In addition, the second comparator 102 exports high level, the high level makes as above-mentioned second
Energy signal CN2 so that second switch transistor M2 is turned on.Based on this, the first luminescent device L1 and the second luminescent device L2 are sent out
Light.So the first alarm signal output module 30 and the second alarm signal output module 40 export respectively the first alarm signal and
Second alarm signal.Testing staff may determine that above-mentioned FPC periphery is bad in the presence of seriously tearing or being broken, and FPC is examined
Slowdown monitoring circuit carries out NG operations, and performs step S105 and the FPC is detected.
It should be noted that the course of work of above-mentioned FPC detections circuit is the first benchmark electricity when not torn with FPC peripheries
Pressure side VR1, the second reference voltage terminal VR2And the voltage V in detection line 100inMagnitude relationship be：Vin=VR1>VR2Exemplified by enter
Capable explanation.The present invention is not limited above three voltage end output voltage relation, as long as can ensure the first reference voltage
Hold VR1With the second reference voltage terminal VR2Difference, and the voltage V in detection line 100inWith the first reference voltage terminal VR1With the second benchmark
Voltage end VR2The larger voltage of middle output is identical.
In addition, above-mentioned carried out so that first switch transistor M1 and second switch transistor M2 is N-type transistor as an example
Explanation.Above-mentioned transistor can also be P-type transistor.Detailed process can similarly obtain, and here is omitted.
The embodiment of the present invention provides a kind of FPC detected using any one FPC detections circuit as described above.Should
FPC has detection line 100 on periphery as shown in Figure 1.It is connected by the way that the detection line 100 is detected into circuit with above-mentioned FPC, with right
The breaking degree on the FPC peripheries is detected.
Wherein, above-mentioned detection line 100 can be connected by making and the test point on FPC by way of welding, then
Above-mentioned FPC detection circuits are connected with detection line 100 by the test point.
Or as shown in figure 5, connector 200 can also be provided with FPC, one end of above-mentioned detection line 100 passes through company
Connect device 200 with the first supply voltage end ELVDD to be connected, the other end of detection line 100 is examined by connector 200 and above-mentioned FPC
Slowdown monitoring circuit is connected.
On this basis, the line width of above-mentioned detection line 100 is 0.15mm~0.25mm.Preferably, the line of the detection line 100
A width of 0.2mm.So, the narrower detection line 100 of line width can be formed on the basis of manufacture craft difficulty is not increased,
So as to provide weak voltage to above-mentioned FPC detection circuits, to cause the FPC to detect change of the circuit by above-mentioned weak voltage
Change and judge that the FPC peripheries are broken bad degree.
The FPC detection circuits that above-mentioned FPC provides with previous embodiment have identical technique effect, and here is omitted.
Offer of the embodiment of the present invention is a kind of to detect what circuit was detected to FPC using any one FPC as described above
Method.Wherein, it is necessary to the first reference voltage terminal V before the detection method is performedR1, the second reference voltage terminal VR2And inspection
Voltage V on survey line 100inSize be configured.Wherein, the first reference voltage terminal VR1Voltage and the second reference voltage terminal
VR2Voltage it is different, and when detection line 100 does not occur to be broken completely or partially, the voltage V in the detection line 100inWith first
Reference voltage terminal VR1With the second reference voltage terminal VR2It is identical to export larger voltage.
In the case, as shown in fig. 6, above-mentioned detection method includes：
S201, the first supply voltage end ELVDD of one end connection by the detection line 100 on FPC peripheries, by the detection line 100
The other end and FPC detection circuit be connected.
S202, the first enable signal generation module 10 as shown in Figure 2 are according to the voltage V in detection line 100inAnd first
Reference voltage terminal VR1Generate the first enable signal CN1.
Wherein, when the structure of the first enable signal generation module 10 is as shown in Figure 3, the first enable signal generation module
The 10 above-mentioned first enable signal CN1 of generation process is same as above, and here is omitted.
S203, the first alarm signal output module 30 are used for according to the first enable signal CN1, in the second supply voltage end VH
Control under export the first alarm signal.
When the first alarm signal output module 30 includes the first luminescent device L1 as shown in Figure 3, it is preferred that this first
The optical signal that luminescent device L1 is sent is above-mentioned first alarm signal.In addition, the first alarm signal output module 30 output first
The process of alarm signal is same as above, and here is omitted.
S204, the second enable signal generation module 20 are according to the voltage V in detection line 100inAnd second reference voltage terminal
VR2Generate the second enable signal CN2.
Wherein, when the structure of the second enable signal generation module 20 is as shown in Figure 3, the second enable signal generation module
The 20 above-mentioned second enable signal CN2 of generation process is same as above, and here is omitted.
S205, the second alarm signal output module 40 are according to the second enable signal CN2, in the second supply voltage end VHControl
System the second alarm signal of lower output.
When the second alarm signal output module 40 includes the second luminescent device L2 as shown in Figure 3, it is preferred that this second
The optical signal that luminescent device L2 is sent is above-mentioned second alarm signal.In addition, the second alarm signal output module 40 output second
The process of alarm signal is same as above, and here is omitted.
The FPC detection circuits that above-mentioned detection method provides with previous embodiment have identical technique effect, herein no longer
Repeat.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of flexible PCB detects circuit, for being detected to flexible PCB, it is characterised in that the flexible circuit
Plate periphery is provided with detection line, and one end of the detection line is used to connect the first supply voltage end；
The flexible PCB detection circuit includes the first enable signal generation module, the second enable signal generation module, first
Alarm signal output module and the second alarm signal output module；
The first enable signal generation module connects the other end and the first reference voltage terminal of the detection line；Described first
Enable signal generation module is used for according to the voltage of the voltage in the detection line and first reference voltage terminal generation the
One enable signal；
The first alarm signal output module is connected with the first enable signal generation module and the second supply voltage end；
The first alarm signal output module is used for according to first enable signal, under the control at the second supply voltage end
Export the first alarm signal；
The second enable signal generation module connects the other end and the second reference voltage terminal of the detection line；Described second
Enable signal generation module is used for according to the voltage of the voltage in the detection line and second reference voltage terminal generation the
Two enable signals；
The second alarm signal output module and the second enable signal generation module and the second supply voltage end；Institute
The second alarm signal output module is stated to be used for according to second enable signal, it is defeated under the control at the second supply voltage end
Go out the second alarm signal.
2. flexible PCB according to claim 1 detects circuit, it is characterised in that first enable signal generates mould
Block includes first comparator；
The in-phase input end of the first comparator connects first reference voltage terminal, inverting input and the detection line phase
Connection, the output end of the first comparator are connected with the first alarm signal output module.
3. flexible PCB according to claim 1 or 2 detects circuit, it is characterised in that first alarm signal is defeated
Going out module includes first switch transistor and the first luminescent device；
The grid of the first switch transistor connects the first enable signal generation module, and the first pole connection described second supplies
Piezoelectric voltage end, the second pole are connected with the anode of first luminescent device；
The negative electrode of first luminescent device connects the 3rd supply voltage end；Wherein, the voltage at the 3rd supply voltage end is small
Voltage in the second supply voltage end.
4. flexible PCB according to claim 3 detects circuit, it is characterised in that first alarm signal exports mould
Block also includes first resistor；One end of the first resistor is connected with the second pole of the first switch transistor, the other end
Connect the anode of first luminescent device.
5. flexible PCB according to claim 1 detects circuit, it is characterised in that second enable signal generates mould
Block includes the second comparator；
The in-phase input end of second comparator connects second reference voltage terminal, inverting input and the detection line phase
Connection, the output end of second comparator are connected with the second alarm signal output module.
6. flexible PCB detection circuit according to claim 1 or 5, it is characterised in that second alarm signal is defeated
Going out module includes second switch transistor and the second luminescent device；
The grid of the second switch transistor connects the second enable signal generation module, and the first pole connection described second supplies
Piezoelectric voltage end, the second pole are connected with the anode of second luminescent device；
The negative electrode of second luminescent device connects the 3rd supply voltage end；Wherein, the voltage at the 3rd supply voltage end is small
Voltage in the second supply voltage end.
7. flexible PCB according to claim 6 detects circuit, it is characterised in that second alarm signal exports mould
Block also includes second resistance；One end of the second resistance is connected with the second pole of the second switch transistor, the other end
Connect the anode of second luminescent device.
A kind of 8. flexible circuit that flexible PCB detection circuit using as described in claim any one of 1-7 is detected
Plate, it is characterised in that
Connector is provided with the flexible PCB, the both ends of the detection line on the flexible PCB periphery are respectively by described
Connector detects circuit with the flexible PCB and the first supply voltage end is connected.
9. flexible PCB according to claim 8, it is characterised in that the line width of the detection line be 0.15mm~
0.25mm。
10. a kind of flexible PCB detection circuit using as described in claim any one of 1-7 is examined to flexible PCB
The method of survey, it is characterised in that methods described includes：
One end of the detection line on the flexible PCB periphery is connected into the first supply voltage end, by the other end of the detection line
It is connected with flexible PCB detection circuit；
First enable signal generation module is enabled according to the voltage in the detection line and the first reference voltage terminal generation first
Signal；
First alarm signal output module is used for according to first enable signal, is exported under the control at the second supply voltage end
First alarm signal；
Second enable signal generation module is enabled according to the voltage in the detection line and the second reference voltage terminal generation second
Signal；
Second alarm signal output module exports according to second enable signal under the control at the second supply voltage end
Second alarm signal；
Wherein, the voltage of first reference voltage terminal is different from the voltage of second reference voltage terminal, and works as the detection
When line does not occur to be broken completely or partially, voltage and first reference voltage terminal and second benchmark in the detection line
It is identical that larger voltage is exported in voltage end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710762728.1A CN107688143A (en) | 2017-08-29 | 2017-08-29 | A kind of flexible PCB detection circuit, flexible PCB and its detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710762728.1A CN107688143A (en) | 2017-08-29 | 2017-08-29 | A kind of flexible PCB detection circuit, flexible PCB and its detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107688143A true CN107688143A (en) | 2018-02-13 |
Family
ID=61155643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710762728.1A Pending CN107688143A (en) | 2017-08-29 | 2017-08-29 | A kind of flexible PCB detection circuit, flexible PCB and its detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107688143A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108777126A (en) * | 2018-07-03 | 2018-11-09 | 京东方科技集团股份有限公司 | Display device, display panel and its detection circuit |
| CN109682856A (en) * | 2019-01-28 | 2019-04-26 | 京东方科技集团股份有限公司 | Crack detection mould group, crack detecting method and display device |
| CN111063957A (en) * | 2018-10-16 | 2020-04-24 | 本田技研工业株式会社 | Battery module and battery unit |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06244254A (en) * | 1993-02-22 | 1994-09-02 | Hitachi Ltd | Semiconductor integrated circuit element |
| US20050200363A1 (en) * | 2004-03-12 | 2005-09-15 | Mitsui Mining & Smelting Co., Ltd. | Electrical inspection method and apparatus for printed wiring board for the electronic component mounting, and computer-readable recording medium |
| CN102759653A (en) * | 2011-04-28 | 2012-10-31 | 鸿富锦精密工业（深圳）有限公司 | Voltage detecting circuit |
| DE102012105848A1 (en) * | 2011-07-07 | 2013-01-10 | Infineon Technologies Ag | Crack detection line facility and method |
| CN103298250A (en) * | 2012-02-29 | 2013-09-11 | 罗伯特·博世（澳大利亚）股份有限公司 | Printed circuit board |
| CN203894376U (en) * | 2014-06-12 | 2014-10-22 | 信利半导体有限公司 | Flexible circuit board test circuit and liquid crystal display device |
| US20150035556A1 (en) * | 2008-02-13 | 2015-02-05 | Infineon Technologies Ag | Crack Sensors for Semiconductor Devices |
| KR20160108930A (en) * | 2015-03-09 | 2016-09-21 | 삼성전자주식회사 | chipping detection circuit of a semiconductor chip, semiconductor chip and method of operating the same |
| DE102016102291A1 (en) * | 2016-02-10 | 2017-08-10 | Infineon Technologies Ag | SEMICONDUCTOR CHIP WITH BROKEN DETECTION |
| CN107068637A (en) * | 2015-10-08 | 2017-08-18 | 三星电子株式会社 | Semiconductor chip with defect detection circuit |
-
2017
- 2017-08-29 CN CN201710762728.1A patent/CN107688143A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06244254A (en) * | 1993-02-22 | 1994-09-02 | Hitachi Ltd | Semiconductor integrated circuit element |
| US20050200363A1 (en) * | 2004-03-12 | 2005-09-15 | Mitsui Mining & Smelting Co., Ltd. | Electrical inspection method and apparatus for printed wiring board for the electronic component mounting, and computer-readable recording medium |
| US20150035556A1 (en) * | 2008-02-13 | 2015-02-05 | Infineon Technologies Ag | Crack Sensors for Semiconductor Devices |
| CN102759653A (en) * | 2011-04-28 | 2012-10-31 | 鸿富锦精密工业（深圳）有限公司 | Voltage detecting circuit |
| DE102012105848A1 (en) * | 2011-07-07 | 2013-01-10 | Infineon Technologies Ag | Crack detection line facility and method |
| CN103298250A (en) * | 2012-02-29 | 2013-09-11 | 罗伯特·博世（澳大利亚）股份有限公司 | Printed circuit board |
| CN203894376U (en) * | 2014-06-12 | 2014-10-22 | 信利半导体有限公司 | Flexible circuit board test circuit and liquid crystal display device |
| KR20160108930A (en) * | 2015-03-09 | 2016-09-21 | 삼성전자주식회사 | chipping detection circuit of a semiconductor chip, semiconductor chip and method of operating the same |
| CN107068637A (en) * | 2015-10-08 | 2017-08-18 | 三星电子株式会社 | Semiconductor chip with defect detection circuit |
| DE102016102291A1 (en) * | 2016-02-10 | 2017-08-10 | Infineon Technologies Ag | SEMICONDUCTOR CHIP WITH BROKEN DETECTION |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108777126A (en) * | 2018-07-03 | 2018-11-09 | 京东方科技集团股份有限公司 | Display device, display panel and its detection circuit |
| CN108777126B (en) * | 2018-07-03 | 2021-05-18 | 京东方科技集团股份有限公司 | Display device, display panel and detection circuit thereof |
| CN111063957A (en) * | 2018-10-16 | 2020-04-24 | 本田技研工业株式会社 | Battery module and battery unit |
| CN109682856A (en) * | 2019-01-28 | 2019-04-26 | 京东方科技集团股份有限公司 | Crack detection mould group, crack detecting method and display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204116461U (en) | Display panel | |
| CN107688143A (en) | A kind of flexible PCB detection circuit, flexible PCB and its detection method | |
| CN101806852B (en) | A kind of LED on-line checkingi and fault display method | |
| CN102723311B (en) | Array substrate measuring method | |
| CN102830323B (en) | Device and method for detecting welding abnormality of electrostatic discharge protection chip | |
| CN102830520B (en) | display panel and detection method thereof | |
| CN102819126A (en) | Testing device and testing method | |
| CN105122125A (en) | Liquid crystal display, detection method for liquid crystal display and electronic device | |
| CN108305577A (en) | A kind of detection device and detection method of display panel | |
| CN103869207B (en) | DC DC device welding detection devices | |
| CN103487961B (en) | Display panel testing method | |
| CN101655627B (en) | Pixel array base plate with touch control function, repair method and plane display thereof | |
| CN205280867U (en) | Connecting wire detection device | |
| CN102280870B (en) | Switching circuit board and protection method thereof | |
| CN1284968C (en) | Leakage liquid detecting device | |
| CN102967954A (en) | Device and method for testing liquid crystal panel | |
| CN103941434B (en) | Backlight module and its electrostatic damage detection method | |
| CN102298224B (en) | Crimping detection device | |
| CN103323732B (en) | Photovoltaic inverter multi-channel input reverse connection detection circuit with self-diagnostic function | |
| CN101806871B (en) | A kind of online test method | |
| CN101644735A (en) | Method for rapidly overhauling PCBA line fault of mobile phone | |
| CN101140312B (en) | Plasma display board electric pole short circuit, broken circuit detecting method and device thereof | |
| CN107481678A (en) | Backlight drive current monitoring circuit, method and the display device of backlight module | |
| CN206848624U (en) | Detection means | |
| CN101498763A (en) | Audio channel detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180213 |
|
| RJ01 | Rejection of invention patent application after publication |