CN202815143U - Short/open-circuit testing circuit for flexible circuit board touch screen IC channel - Google Patents
Short/open-circuit testing circuit for flexible circuit board touch screen IC channel Download PDFInfo
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- CN202815143U CN202815143U CN201220512179.5U CN201220512179U CN202815143U CN 202815143 U CN202815143 U CN 202815143U CN 201220512179 U CN201220512179 U CN 201220512179U CN 202815143 U CN202815143 U CN 202815143U
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Abstract
The utility model discloses a short/open-circuit testing circuit for a flexible circuit board touch screen IC channel, characterized in that the signal emitting electrodes and the signal receiving electrodes of the binding end of a flexible circuit board are respectively connected with an external testing board, simultaneously the I2C communication interface of the flexible circuit board is connected with an I2C communication board, the I2C communication board is connected with a computer, inside the external testing board there is provided a controller, the group of signal emitting electrodes orderly transmit square waves to a sensing glass, and simultaneously the group of signal receiving electrodes orderly receive coupled signals from the other end of the sensing glass and convert the received signals into concrete data, thereby obtaining concrete touch coordinate information. The short/open-circuit testing circuit can accurately determine whether a short/open-circuit phenomenon exists in various pins and the flexible circuit board binding area of the capacitive touch screen control IC.
Description
Technical field
The utility model relates to a kind of capacitance plate circuit testing method, particularly flexible circuit board touch-screen IC passage weak point/out of circuit test circuit.
Background technology
Produce at present in the capacitive touch screen process, the chances are 10% for the ratio of flexible circuit board deficient purchase, because flexible circuit board has been bound components and parts, but it is on glass not to be tied to capacitive sensing, so producing in the capacitive touch screen industry at present, do not have also whether a kind of method can be non-defective unit than the flexible circuit board that tests out more completely the good components and parts of binding, therefore basically do not test for the flexible circuit board that tests out the good components and parts of binding, or by I2C communication interface connecting test plate, whether normal, can not accurately judge touch-screen IC(capacitive touch screen control processor if only testing communication and power consumption) whether each pin have the phenomenon that lack/opens circuit.
The utility model content
Technical problem to be solved in the utility model is, detect each passage in flexible circuit board binding district and control being connected of IC whether the phenomenon that opens circuit or lack is arranged with touch-screen, whether realize testing out flexible circuit board by the adding external circuit is non-defective unit, thereby screen Decrease production cost.
1) the utility model is taked following technical scheme for achieving the above object: flexible circuit board touch-screen IC passage weak point/out of circuit test circuit, it is characterized in that, the signal emitting electrode of flexible circuit board binding end is connected with signal-receiving electrode with the external testing plate and is connected, I2C communication interface with flexible circuit board connects the I2C communication board simultaneously, the I2C communication board connects computer, in the external testing plate controller is installed.
Principle of work of the present utility model is: one group of signal emitting electrode (pin of output signal) and one group of signal-receiving electrode (receiving the pin of signal) are arranged, the signal emitting electrode is that the transmit leg wave impulse is on glass to sensing successively in order, synchronous signal receiving electrode group also is the signal that goes successively in order to receive from the other end coupling of sensing glass, convert the signal that receives to concrete data again, thereby draw concrete touch coordinate information.
The utility model has the advantages that, detect touch-screen control IC output signal pin and the signal emitting electrode connection state of binding the district, only need to when touch-screen is controlled IC work, can judge by the change in voltage that external circuit goes to detect binding district signal emitting electrode successively.Detect touch-screen control IC and receive signal pin and the signal-receiving electrode connection state of binding the district, only need to be when touch-screen be controlled IC work, go successively to provide high level to binding district signal-receiving electrode by external circuit, then read the data of inner corresponding this electrode of touch-screen control IC and can judge.Can judge accurately the phenomenon whether short interruption is arranged in capacitive touch screen control each pin of IC and flexible PCB binding district.
Description of drawings
Fig. 1 is flexible circuitry board test connection diagram of the present utility model.
Fig. 2 is the signal graph of capacitive touch screen control IC emitting electrode of the present utility model output.
Fig. 3 is process control chart of the present utility model.
Reference numeral: 1, I2C communication interface
,2, touch-screen control IC, 3, the binding end, 31, the signal emitting electrode, 32, signal-receiving electrode, 4, the external testing plate, 5, controller, 6, the I2C communication board, 7, computer.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples, referring to Fig. 1 to Fig. 3, flexible circuit board touch-screen IC passage weak point/out of circuit test circuit, it is characterized in that, the signal emitting electrode 31 of flexible circuit board binding end 3 is connected with signal-receiving electrode and is connected with external testing plate 4 respectively, I2C communication interface 1 with flexible circuit board connects I2C communication board 6 simultaneously, and I2C communication board 6 connects computer 7, and controller 5 is installed in the external testing plate 4.
Method of testing of the present utility model is as follows:
1) touch-screen control IC2 works on power;
2) open controller 5, signal emitting electrode 31 interrupts;
3) whether test signal interrupts, and is bad without look-at-me, finishes test; If any look-at-me, then further read other pin status;
4) be high level as surpassing a pin status, for bad; As to only have this pin status be high level, normal for connecting, and gets back to step 2;
5) when pin status is high level, all emitting electrode tests are normal for connecting;
6) read the voltage transitions value that touch-screen control IC2 respectively receives signalling channel;
7) a receiving cable voltage is drawn high;
8) read the voltage transitions value that touch-screen control IC2 respectively receives signalling channel: when the voltage transitions value that surpasses an emission pin changes greatly, when perhaps not having conversion value to change greatly, for bad, finish test; When the voltage transitions value of only having this emission pin of correspondence changed greatly, all receiving electrodes tests were for normal, and all passages connections are normal, test as very, finish test.
The utility model will be bound the general input and output pin of GPIO(that end 3 each contact points are connected to an outside controller 5 by connector) on the port, the GPIO port that connects simultaneously the signal emitting electrode 31 of touch-screen control IC2 need to meet the following conditions: can independent respective interrupt signals, and the voltage that can respond interruption is greater than 3V.The independently above signal of the controllable 3V of providing of while need to be provided the GPIO port that connects the signal-receiving electrode 32 of touch-screen control IC2, and single-chip microcomputer can be selected C8051, LPC2133.The I2C communication interface 1 of flexible circuit board connects I2C communication board 6 and connects computer 7 again.
1. the signal emitting electrode 31 in test binding district and touch-screen are controlled the connectivity of IC2.
Touch-screen control IC2 sends square-wave signal to signal emitting electrode 31 in order successively, and square-wave signal, is controlled IC2 with touch-screen and worked on power referring to Fig. 2 generally greater than 100 microseconds.
The interruption of GPIO that simultaneously external testing plate 4 is connected the corresponding signal emitting electrode 31 of touch-screens control IC2 was also opened for 1 second successively, in 1 second.If receive interruption signal not, illustrate this signal emitting electrode 31 with touch-screen control IC2 UNICOM, UNICOM does not illustrate that this flexible PCB is bad, finishes test; If receive signal, controller 5 responses are interrupted.Read simultaneously the state that connects controller 5 all pins, if only having this corresponding pin is high level, other all are low level, show that this passage is for normal, without short circuit phenomenon, also be in simultaneously high level state if detect other signal emitting electrode 31, then judge this signal emitting 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 are controlled the connectivity of IC2.
The signal-receiving electrode 32 of touch-screen control IC2 is when receiving high level signal, and it is very large that the voltage transitions value of inner corresponding this passage of touch-screen control IC2 will become.According to this characteristic, touch-screen is controlled IC2 work on power, successively each signal-receiving electrode 32 is done following operation, read first the voltage transitions value conversion value of each passage, then in order signal-receiving electrode 32 is pulled into high level.Then read the conversion value of inner each passage of touch-screen control IC2, if the conversion value of neither one passage alters a great deal, think that then this passage opens circuit, if only have the conversion value of a passage to alter a great deal, it is normal to judge that then this passage connects, if the conversion value of a plurality of passages alters a great deal, think that then this passage and other passages have short circuit phenomenon.
Claims (1)
1. flexible circuit board touch-screen IC passage weak point/out of circuit test circuit, it is characterized in that, the signal emitting electrode of flexible circuit board binding end is connected with signal-receiving electrode with the external testing plate and is connected, I2C communication interface with flexible circuit board connects the I2C communication board simultaneously, the I2C communication board connects computer, in the external testing plate controller is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220512179.5U CN202815143U (en) | 2012-10-08 | 2012-10-08 | Short/open-circuit testing circuit for flexible circuit board touch screen IC channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220512179.5U CN202815143U (en) | 2012-10-08 | 2012-10-08 | Short/open-circuit testing circuit for flexible circuit board touch screen IC channel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202815143U true CN202815143U (en) | 2013-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220512179.5U Expired - Fee Related CN202815143U (en) | 2012-10-08 | 2012-10-08 | Short/open-circuit testing circuit for flexible circuit board touch screen IC channel |
Country Status (1)
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| CN (1) | CN202815143U (en) |
Cited By (5)
| 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 |
| CN104932961A (en) * | 2015-05-28 | 2015-09-23 | 广东小天才科技有限公司 | Method and device for detecting data line bonding open circuit in terminal equipment |
| CN106771832A (en) * | 2017-02-23 | 2017-05-31 | 京东方科技集团股份有限公司 | A kind of circuit checker, circuit detecting method and apply its display device |
| CN113282193A (en) * | 2021-05-27 | 2021-08-20 | 昆山龙雨智能科技有限公司 | Detection method of flexible circuit board and capacitive touch screen |
| CN113325335A (en) * | 2021-08-04 | 2021-08-31 | 南昌龙旗信息技术有限公司 | Circuit failure detection circuit and method and intelligent electronic equipment |
-
2012
- 2012-10-08 CN CN201220512179.5U patent/CN202815143U/en not_active Expired - Fee Related
Cited By (9)
| 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 |
| CN104932961A (en) * | 2015-05-28 | 2015-09-23 | 广东小天才科技有限公司 | Method and device for detecting data line bonding open circuit in terminal equipment |
| CN106771832A (en) * | 2017-02-23 | 2017-05-31 | 京东方科技集团股份有限公司 | A kind of circuit checker, circuit detecting method and apply its display device |
| US10339846B2 (en) | 2017-02-23 | 2019-07-02 | Boe Technology Group Co., Ltd. | Device and method for circuit testing and display device applying the same |
| CN106771832B (en) * | 2017-02-23 | 2019-08-16 | 京东方科技集团股份有限公司 | Its display device of a kind of circuit checker, circuit detecting method and application |
| CN113282193A (en) * | 2021-05-27 | 2021-08-20 | 昆山龙雨智能科技有限公司 | Detection method of flexible circuit board and capacitive touch screen |
| CN113282193B (en) * | 2021-05-27 | 2023-07-21 | 昆山龙雨智能科技有限公司 | Flexible circuit board and detection method of capacitive touch screen |
| CN113325335A (en) * | 2021-08-04 | 2021-08-31 | 南昌龙旗信息技术有限公司 | Circuit failure detection circuit and method and intelligent electronic equipment |
| CN113325335B (en) * | 2021-08-04 | 2021-11-23 | 南昌龙旗信息技术有限公司 | Circuit failure detection circuit and method and intelligent electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 330096 Nanchang high tech Development Zone, Jingdong Road, No. 1699, No. Patentee after: JIANGXI LIANCHUANG ELECTRONICS CO.,LTD. Address before: 330096 Nanchang high tech Development Zone, Jingdong Road, No. 1699, No. Patentee before: JIANGXI LIANCHUANG ELECTRONIC Co.,Ltd. |
|
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 330096 Nanchang high tech Development Zone, Jingdong Road, No. 1699, No. Patentee after: JIANGXI LIANCHUANG ELECTRONIC Co.,Ltd. Address before: 330096 Nanchang high tech Development Zone, Jingdong Road, No. 1699, No. Patentee before: JIANGXI LIANCHUANG ELECTRONICS CO.,LTD. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20211008 |