CN102879705B - Flexible circuit board touch screen IC passage is short/out of circuit test method - Google Patents
Flexible circuit board touch screen IC passage is short/out of circuit test method Download PDFInfo
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- CN102879705B CN102879705B CN201210377277.7A CN201210377277A CN102879705B CN 102879705 B CN102879705 B CN 102879705B CN 201210377277 A CN201210377277 A CN 201210377277A CN 102879705 B CN102879705 B CN 102879705B
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Abstract
The invention discloses a kind of flexible circuit board touch screen IC passage short/out of circuit test method, it is characterized in that, signal emission electrode and the signal-receiving electrode of flexible circuit board binding end are connected with external testing plate respectively, the I2C communication interface of flexible circuit board is connected I2C communication board simultaneously, I2C communication board connects computer, is provided with controller in external testing plate.There are one group of signal emission electrode and one group of signal-receiving electrode, signal emission electrode is that sender's wave impulse the most successively is to sensing on glass, it is also to go the most successively to receive the signal from sensing glass other end coupling that synchronous signal receives electrode group, the signal of reception is converted into concrete data again, thus draws concrete touch coordinate information.The present invention can judge that capacitive touch screen controls the phenomenon whether having short interruption of each pin of IC and flexible PCB binding district accurately.
Description
Technical field
The present invention relates to a kind of capacitance plate circuit testing method, short/disconnected particularly to flexible circuit board touch screen IC passage
Drive test method for testing.
Background technology
During at present producing capacitive touch screen, the chances are 10% for the ratio of flexible circuit board deficient purchase, because flexible
Wiring board has bound components and parts, but is not bound on capacitive sensing glass, so producing capacitive touch screen at present
In industry, also there is no whether a kind of method can be good than testing out the flexible circuit board of the components and parts bound more completely
Product, therefore do not test for testing out the flexible circuit board of the components and parts bound, or by I2C communication interface
Connecting test plate, only test communication and power consumption are the most normal, can not accurately judge at touch screen IC(capacitive touch screen control
Reason device) whether each pin have the phenomenon of short/open circuit.
Summary of the invention
The technical problem to be solved is intended to detect each passage and the touch screen control in flexible circuit board binding district
Whether whether the connection of IC processed has open circuit or short phenomenon, by adding external circuit and realizing and testing out flexible circuit board be
Non-defective unit, thus screen, reduce production cost.
The present invention adopts the following technical scheme that for achieving the above object: and flexible circuit board touch screen IC passage is short/and open circuit surveys
Method for testing, it is characterised in that the flexible circuit board binding signal emission electrode of end and signal-receiving electrode respectively with external testing
Plate connects, and the I2C communication interface of flexible circuit board is connected I2C communication board simultaneously, and I2C communication board connects computer, external testing
Controller is installed in plate；Its method of testing is as follows:
1) touch screen control IC works on power；
2) opening controller, signal emission electrode interrupts；
3) whether test signal interrupts, and is bad without interrupt signal, terminates test；If any interrupt signal, read the most further
Take other pin status；
4) as being high level more than a pin status, for bad；If only this pin status is high level, for just connecting
Often, step 2 is returned to；
5) when pin status is high level, the test of all emission electrodes is normal for connecting；
6) read touch screen control IC and respectively receive the voltage conversion value of signalling channel；
7) a reception channel voltage is drawn high；
8) read touch screen control IC and respectively receive the voltage conversion value of signalling channel: when the voltage launching pin more than one
Conversion value changes greatly, or when not having conversion value change greatly, for bad, terminates test；Electricity when this transmitting pin the most corresponding
When pressure conversion value changes greatly, all reception electrode tests are normal, and all passages connect normal, test as good, terminate to test.
The operation principle of the present invention is: have one group of signal emission electrode (pin of output signal) and one group of signal to receive electricity
The pole pin of signal (receive), signal emission electrode is sender's wave impulse the most successively on sensing glass, synchronous signal
Receiving electrode group is also to remove to receive the signal from sensing glass other end coupling the most successively, then the signal conversion that will receive
Become concrete data, thus draw concrete touch coordinate information.
It is an advantage of the invention that detection touch screen controls IC output signal pin with the signal emission electrode binding district even
Connect situation, it is only necessary to when touch screen controls IC work, removed detection binding district signal emission electrode by external circuit successively
Change in voltage i.e. can determine whether.Detection touch screen controls IC and receives the signal-receiving electrode connection state of signal pin and binding district,
Have only to when touch screen controls IC work, gone successively by external circuit to provide high level to binding district signal-receiving electrode,
Then the data reading internal this electrode corresponding of touch screen control IC i.e. can determine whether.Capacitive touch screen control can be judged accurately
Each pin of IC processed binds the phenomenon whether having short interruption in district with flexible PCB.
Accompanying drawing explanation
Fig. 1 is the flexible circuitry board test connection diagram of the present invention.
Fig. 2 is that the capacitive touch screen of the present invention controls the signal graph that IC emission electrode exports.
Fig. 3 is the process control chart of the present invention.
Reference: 1, I2C communication interface, 2, touch screen control IC, 3, binding end, 31, signal emission electrode, 32, letter
Number receive electrode, 4, external testing plate, 5, controller, 6, I2C communication board, 7, computer.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described, sees Fig. 1 to Fig. 3, and flexible circuit board touches
Screen IC passage is short/out of circuit test method, it is characterised in that and the flexible circuit board binding signal emission electrode 31 of end 3 and signal connect
Receive electrode 32 to be connected with external testing plate 4 respectively, the I2C communication interface 1 of flexible circuit board connected I2C communication board 6 simultaneously,
I2C communication board 6 connects computer 7, is provided with controller 5 in external testing plate 4；Its method of testing is as follows:
1) touch screen control IC2 works on power；
2) opening controller 5, signal emission electrode 31 interrupts；
3) whether test signal interrupts, and is bad without interrupt signal, terminates test；If any interrupt signal, read the most further
Take other pin status；
4) as being high level more than a pin status, for bad；If only this pin status is high level, for just connecting
Often, step 2 is returned to；
5) when pin status is high level, the test of all emission electrodes is normal for connecting；
6) read touch screen control IC2 and respectively receive the voltage conversion value of signalling channel；
7) a reception channel voltage is drawn high；
8) read touch screen control IC2 and respectively receive the voltage conversion value of signalling channel: when the electricity launching pin more than
Pressure conversion value changes greatly, or when not having conversion value change greatly, for bad, terminates test；When the most corresponding this launches pin
When voltage conversion value changes greatly, all reception electrode tests are normal, and all passages connect normal, test as good, terminate survey
Examination.
The present invention is general by the GPIO(of the controller 5 that binding each contact point of end 3 is connected to outside by adapter
Input and output pin) on port, the GPIO port being simultaneously connected with the signal emission electrode 31 that touch screen controls IC2 needs full
Be enough to lower condition: can independent respective interrupt signals, and the voltage interrupted can be responded more than 3V.Connect touch screen and control IC2's
The GPIO port of signal-receiving electrode 32 need to meet can the signal of the most controllable offer more than 3V, single-chip microcomputer
Can be selected for C8051, LPC2133.The I2C communication interface 1 of flexible circuit board even I2C communication board 6 reconnects computer 7.
1, the signal emission electrode 31 in test binding district and touch screen control the connectivity of IC2.
It is all to send square-wave signal to signal emission electrode 31 the most successively that touch screen controls IC2, and square-wave signal is general
More than 100 microseconds, see Fig. 2, touch screen is controlled IC2 and works on power.
External testing plate 4 is connected the interruption of GPIO of the corresponding signal emission electrode 31 of touch screen control IC2 simultaneously also
Open successively 1 second, in 1 second.If the interrupt signal of reception, illustrate that this signal emission electrode 31 does not controls IC2 with touch screen
UNICOM, non-UNICOM illustrates that this flexible PCB is bad, terminates test；If receiving signal, controller 5 response is interrupted.With
Time read the state connecting all pins of controller 5, if the pin of only this correspondence is high level, other are all low level,
Show that this passage is normal, without short circuit phenomenon, if be detected that other signal emission electrode 31 is also simultaneously in high level shape
State, then judge this signal emission electrode 31 and other pin short circuits.Then this flexible PCB is defective products.
2, the signal-receiving electrode 32 in test binding district and touch screen control the connectivity of IC2.
The signal-receiving electrode 32 of touch screen control IC2 is when receiving high level signal, and it is internal right that touch screen controls IC2
It is the biggest that the voltage conversion value answering this passage will become.According to this characteristic, touch screen is controlled IC2 and works on power, successively to respectively
Signal-receiving electrode 32 does following operation, first reads the voltage conversion value conversion value of each passage, is received by signal the most in order
Electrode 32 pulls into high level.Then read touch screen and control the conversion value of the internal each passage of IC2, if neither one passage
Conversion value changes the most greatly, then it is assumed that this passage open circuit, if the conversion value of only one of which passage changes the most greatly, then judges this passage
Connect normal, if the conversion value of multiple passage changes the most greatly, then it is assumed that this passage and other passages have short circuit phenomenon.
Claims (1)
1. flexible circuit board touch screen control IC passage short/out of circuit test method, it is characterised in that flexible circuit board binding end
Signal emission electrode and signal-receiving electrode are connected with external testing plate respectively, simultaneously by the I2C communication interface of flexible circuit board
Connecting I2C communication board, I2C communication board connects computer, is provided with controller in external testing plate, and its method of testing is as follows:
1) touch screen control IC works on power；
2) opening controller, touch screen controls IC and sends square-wave signal to signal emission electrode the most successively；
3) test touch screen control IC emission electrode is sent out to outside controller IC reception electrode by flexible circuit board emission electrode
Whether the electrode interrupt signal penetrated interrupts, and is that touch screen control IC welds open circuit or breakage of circuit with flexible circuit board without interrupt signal
Road, terminates test；If the interrupt signal of receiving, controller response is interrupted, and reads the shape connecting all pins of controller simultaneously
State；
4) if the pin only having this correspondence is high level, other are all low level, show that this passage is normal, existing without short circuit
As, if be detected that other signal emission electrode is also simultaneously in high level state, then judge this signal emission electrode and its
His pin is short-circuit, then this flexible PCB is defective products, returns to step 2)；
5) when the emission electrode that touch screen controls IC is high level, the test of all emission electrodes is normal for connecting；
6) read touch screen control IC and respectively receive the voltage conversion value of signalling channel；
7) the most successively the voltage of signal-receiving electrode is pulled into high level；
8) read touch screen control IC and respectively receive the voltage conversion value of signalling channel: if the conversion value of neither one passage becomes
Change the biggest, then it is assumed that this passage open circuit, if the conversion value of only one of which passage changes the most greatly, then judge that this passage is just connecting
Often, if the conversion value of multiple passage changes the most greatly, then it is assumed that this passage and other passages have short circuit phenomenon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210377277.7A CN102879705B (en) | 2012-10-08 | 2012-10-08 | Flexible circuit board touch screen IC passage is short/out of circuit test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210377277.7A CN102879705B (en) | 2012-10-08 | 2012-10-08 | Flexible circuit board touch screen IC passage is short/out of circuit test method |
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| Publication Number | Publication Date |
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| CN102879705A CN102879705A (en) | 2013-01-16 |
| CN102879705B true CN102879705B (en) | 2016-08-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163447A (en) * | 2013-03-28 | 2013-06-19 | 苏州瀚瑞微电子有限公司 | Method for detecting flexible printed circuit (FPC) finished product |
| CN104569727B (en) * | 2015-01-23 | 2017-12-08 | 珠海隆芯电子科技有限公司 | The method of testing of contactless electronic circuit test device |
| CN105301431B (en) * | 2015-11-18 | 2019-02-01 | 蓝思科技(东莞)有限公司 | A kind of micro- out of circuit test method of high-frequency percussion and test macro |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797357A (en) * | 2004-12-30 | 2006-07-05 | 鸿富锦精密工业（深圳）有限公司 | Circuit board for testing function of main board |
| CN101261379A (en) * | 2008-02-01 | 2008-09-10 | 信利半导体有限公司 | Capacitance type touch screen and touch display devices containing the touch screen |
| CN101846709A (en) * | 2009-03-23 | 2010-09-29 | 友达光电股份有限公司 | Short circuit test board for circuit of flexible circuit board and test method thereof |
| CN201440261U (en) * | 2009-06-05 | 2010-04-21 | 超级先锋有限公司 | Improved capacitive touch screen |
| CN101697003B (en) * | 2009-11-06 | 2011-08-03 | 烽火通信科技股份有限公司 | Short circuit detecting method and short circuit detecting device |
| CN202217255U (en) * | 2011-09-27 | 2012-05-09 | 利信光学（苏州）有限公司 | Capacitive touch screen structure |
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