CN111007432B - Method for searching open short circuit position of silver paste - Google Patents
Method for searching open short circuit position of silver paste Download PDFInfo
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- CN111007432B CN111007432B CN201911271584.5A CN201911271584A CN111007432B CN 111007432 B CN111007432 B CN 111007432B CN 201911271584 A CN201911271584 A CN 201911271584A CN 111007432 B CN111007432 B CN 111007432B
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- silver paste
- short circuit
- resistance
- conductive cotton
- cotton
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The invention discloses a method for searching for an open short circuit position of silver paste, which belongs to the field of touch screen printing preparation and comprises the steps of searching for an open short circuit range, measuring and comparing resistance, moving conductive cotton according to a comparison result, determining a relatively accurate position, searching for the accurate position visually and the like.
Description
Technical Field
The invention relates to the field of printing and preparing of silver paste of a touch screen, in particular to a method for searching open and short circuit positions of the silver paste.
Background
In the process of manufacturing the capacitive screen, a silver paste is printed, then the circuit is engraved by laser, and due to the influence of factors such as production environment and materials, the problem of open and short circuit of a channel occasionally occurs in the production process, as shown in fig. 1. After the open short circuit problem occurs, the production needs to find out the position of the open short circuit, and then the poor circuit needs to be isolated and analyzed, and the phenomenon of the open short circuit is similar to that shown in fig. 2 and fig. 3. So as to repair the product and analyze the cause of the problem;
at present, a test probe and software test can be used for easily finding out which channel has the problem of open short circuit, but the specific position of the open short circuit is slowly found out by amplifying through a microscope or a magnifying lens at present; and as the product is made bigger and bigger, the circuit is longer and more, thereby often can make a round trip to find out the short circuit position on a piece of product after the problem appears, need spend a large amount of time, the gap of conventional laser is 0.035mm, and the linewidth of silver thick liquid is 0.03-0.2mm, such linewidth, and in the circuit that is denser, it is difficult directly to see clearly with eyes, it is just good to see some easily, and some is then unobvious, the condition that often can appear and round trip to look for the problem point. As shown in fig. 4 and 5, the short circuit channel at the golden finger position is measured to determine that the short circuit is opened and short-circuited, the short circuit position is found by observing the channel from left to right in a way of viewing the channel by using a magnifier, the short circuit defect is found by using eyes, and the conditions facing the current production are summarized:
1. after laser is carried out on part of types of silver paste lines with overlong channels and narrower channels, the film is too long to find a short-circuit source;
2. the searching mode consumes too heavy manpower, and cannot bring efficiency during batch production;
3. materials are easy to accumulate during short circuit repair, so that the occupied net truck cannot transfer;
4. the laser material speed of the laser machine is higher than that of the repair material, so that the material is ready for the later stage process;
5. the eyes can be tired when the eyes watch the silver paste line for a long time and the laser table is too bright.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to quickly find the position of the open short circuit of the silver paste circuit.
In order to solve the technical problems, the invention provides the following technical scheme:
a method for searching a short circuit position of silver paste comprises the following steps:
(1) determining a bad product with an open short circuit by using test software, and determining a range containing a bad silver paste channel after judging that the product is in the short circuit;
(2) measuring and recording first resistances of the adjacent 2 silver paste channels at the end parts of the silver paste channels by using a universal meter, wherein the first resistance is the sum of the measured first resistances from the silver paste channels to the short-circuit position;
(3) at the middle position of the line length, conducting cloth or conducting cotton is used for short-circuiting the silver paste channel at the middle position, then resistance is measured to obtain a second resistance, the resistance values of the first resistance and the second resistance are compared, the conducting cotton is moved according to the comparison result of the resistance values, and the moving of the conducting cotton is stopped until the comparison result is changed, so that the relatively accurate position of the short circuit is determined;
(4) after the relatively accurate position of the short circuit position is determined, the short circuit position can be found out by checking the position condition of the specific short circuit through a visual magnifier.
Preferably, the method for moving the conductive cotton according to the comparison result of the resistance values comprises the following steps: if the second resistor is smaller than the first resistor, slowly moving the conductive cotton in a direction away from the measurement position of the multimeter until the conductive cotton stops moving when the second resistor is close to or the same as the first resistor, and determining that the position of the short circuit is near the stop position of the conductive cotton; if the second resistor is the same as the first resistor, slowly moving the conductive cotton along the direction close to the measuring position of the multimeter until the conductive cotton stops moving when the resistance value begins to change, and enabling the position of the short circuit to be close to the stop position of the conductive cotton;
preferably, the conductive cloth or the conductive cotton is made of a flexible material.
A method for searching an open circuit position of silver paste comprises the following steps:
(1) firstly, confirming a bad silver paste channel by adopting software, and determining a range containing the bad silver paste channel after judging that the circuit is open;
(2) then measuring and recording the resistance of the adjacent 2 silver paste channels at the end parts of the silver paste channels by using a universal meter, wherein one of the adjacent 2 silver paste channels is an open-circuit channel, and the other one is a normal channel, and the universal meter displays no resistance at the moment;
(3) the method comprises the following steps of (1) short-circuiting the middle positions of circuits of 2 adjacent silver paste channels by adopting flexible conductive cotton, measuring a resistor, and stopping moving the conductive cotton according to the existence of a display resistance value of a universal meter until a display result of the universal meter is changed so as to determine the relatively accurate position of the short circuit;
(4) after the relatively accurate position of the bad position is determined through the steps, the accurate position of the open circuit is found out through visual inspection;
preferably, the method for displaying the presence or absence of the movable conductive cotton according to the resistance value of the multimeter comprises the following steps: if the multimeter displays a resistor, slowly moving the conductive cotton to the far end of the measuring position of the multimeter until the resistor disappears and stops moving the conductive cotton, and the open circuit position is close to the stop position of the conductive cotton; if the multimeter shows no resistance, the conductive cotton is slowly moved toward the proximal end of the multimeter measurement location until the multimeter shows a resistance, and the open circuit location is near the conductive cotton stop location.
The invention has the following beneficial effects:
the short circuit position can be quickly confirmed by pressing and searching the model membrane material with the longer silver wire after the short circuit by the conductive cotton, the short circuit cannot be locked as soon as possible by manpower, the repairing speed is obviously accelerated by using the searching method, the searching speed is about 6 minutes originally, the current time is 2 minutes, the membrane material accumulation condition of the bad position to be searched is improved, the production efficiency is improved, and the yield is increased.
Description of the drawings:
FIG. 1 schematic diagram of silver paste printing and laser engraving;
FIG. 2 shows the open circuit phenomenon of silver paste channel;
FIG. 3 shows the short circuit phenomenon of silver paste channel;
FIGS. 4 and 5 are diagrams of a prior art method of finding open short circuit locations;
FIG. 6 is a schematic diagram of a bad channel tested by software;
FIG. 7 schematic diagram of a resistance measurement and recording process
FIGS. 8 and 9 are schematic illustrations of an embodiment of conductive cotton;
FIGS. 10 and 11 are schematic views illustrating a process of moving conductive cotton according to a comparison result of resistance values to determine a short circuit position during short circuit detection;
fig. 12 is a schematic diagram of a visual magnifier used to view the position of a specific short circuit.
Detailed Description
The following examples are included to provide further detailed description of the present invention and to provide those skilled in the art with a more complete, concise, and exact understanding of the principles and spirit of the invention.
Example 1: the method for confirming the short circuit of the silver paste channel of the touch screen comprises the following steps:
(1) determining a bad product with an open short circuit by using an HGCS-001H SENSOR tester and matched test software, and determining a range containing bad silver paste channels after judging that the product is in a short circuit condition, wherein the existing 2 channels are in a short circuit as shown in figure 6;
(2) the first resistances of the adjacent 2 silver paste channels are measured and recorded at the ends of the silver paste channels by using a multimeter, the short circuit occurs mainly because residual silver paste or a conductive substance exists between the adjacent 2 silver paste channels to connect the 2 channels, and the resistance measured in the step 1 is the sum of the resistances from the measured 2 silver paste channels to the short circuit position (because the gap of the channel is about 0.035mm, the resistance generated in the short circuit process is also very small, and can be neglected for calculation) as shown in fig. 7.
(3) A strip of conductive cloth or conductive cotton is prepared, and is required to be soft and cannot scratch silver paste and products. As shown in fig. 8 and 9, the silver paste is lap-jointed and placed at the middle position of the line length, and the silver paste channel at the middle position is short-circuited by conductive cloth or conductive cotton, and then the resistance is measured to obtain a second resistance; finding out the position of the short circuit comprises the following specific steps: at the middle position of the line length, conducting cotton is used for short-circuiting 2 adjacent channels to be tested, the resistance values of a first resistor and a second resistor are compared, if the second resistor is smaller than the first resistor, the conducting cotton is slowly moved along the direction far away from the measuring position of the multimeter, and the conducting cotton is stopped moving when the second resistor is close to or the same as the resistance value of the first resistor, so that the position of the short circuit can be determined to be near the stopping position of the conducting cotton; if the second resistor is the same as the first resistor, slowly moving the conductive cotton along the direction close to the measuring position of the multimeter until the conductive cotton stops moving when the resistance value begins to change, and the position of the short circuit is close to the stop position of the conductive cotton, as shown in FIG. 10 and FIG. 11;
(4) the position near the short circuit is determined through the steps, and then the specific short circuit position is seen through a visual magnifier.
Example 2: the method for confirming the open circuit of the silver paste channel of the touch screen comprises the following steps:
in the prior art, a short-circuit test can determine the position of a short circuit only by testing the head and the tail of a circuit, but on a capacitive screen, the circuit is easily scratched by a multimeter due to the thin circuit and is often inaccurate; meanwhile, when a large-size (such as 86-inch) product is manufactured, sometimes the length of a tested probe line is not long enough, or the line length is easy to scrape the product in the measurement process, the method searches the exact position of an open circuit by using a short circuit mode, and specifically comprises the following steps:
(1) in the same way as in embodiment 1, software is also adopted to confirm a bad channel, after the condition of open circuit is judged, a universal meter is used for measuring the resistance of the open channel and the adjacent channel at the end part of a circuit, one of the 2 adjacent silver paste channels is required to be an open channel, the other is a normal channel, if the two open channels are adopted, the subsequent measurement value cannot be changed, and no resistance value exists at the moment because the short circuit is not adopted;
(2) the method comprises the following steps that conductive cotton is lapped at the middle position of a line to short circuit adjacent channels containing open-circuit positions, and if a universal meter displays resistance to indicate that the adjacent channels are connected and the open-circuit position of the line is at a far end, the conductive cotton needs to be slowly moved to the far end of the measuring position of the universal meter until the resistance disappears, and at this time, the short-circuit position is near the far end; conversely, if the multimeter is displaying or has no resistance indicating that the adjacent channel is not open, and an open circuit position is proximal to the multimeter measurement position, the conductive cotton would need to be slowly moved proximally until the resistance is present, at which point the short circuit position would be in close proximity.
(3) After determining the vicinity of the bad position through the steps, finding out the open circuit condition by visual inspection;
through verification, the short circuit position can be quickly confirmed by pressing the conductive block to find the model film material with the longer silver wire after the short circuit is found, the found short circuit cannot be locked as soon as possible by manpower alone, the repair speed is obviously accelerated by using the method, the finding speed is about 6 minutes originally, the film material accumulation condition is improved in 2 minutes, the film material accumulation phenomenon does not exist at present, personnel actively carry out the method, the feedback is good, the model with the long silver wire is psychological barrier for the personnel, the personnel have no feeling of the type number at present, the psychology is light, and the situation of waiting materials is caused by the fact that laser repair is not fed back in the later process.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.
Claims (3)
1. A method for searching a short circuit position of silver paste is characterized by comprising the following steps:
(1) determining a bad product with an open short circuit by using test software, and determining a range containing a bad silver paste channel after judging that the product is in the short circuit;
(2) measuring and recording first resistances of the adjacent 2 silver paste channels at the end parts of the silver paste channels by using a universal meter, wherein the first resistance is the sum of the measured first resistances from the silver paste channels to the short-circuit position;
(3) at the middle position of the line length, conducting cloth or conducting cotton is used for short-circuiting the silver paste channel at the middle position, then resistance is measured to obtain a second resistance, the resistance values of the first resistance and the second resistance are compared, the conducting cotton is moved according to the comparison result of the resistance values, and the moving of the conducting cotton is stopped until the comparison result is changed, so that the relatively accurate position of the short circuit is determined;
after the relatively accurate position of the short circuit position is determined, a visual magnifier is used for checking the specific short circuit position condition to find out the short circuit position; the method for moving the conductive cotton according to the resistance value comparison result comprises the following steps: if the second resistor is smaller than the first resistor, slowly moving the conductive cotton in a direction away from the measurement position of the multimeter until the conductive cotton stops moving when the second resistor is close to or the same as the first resistor, and determining that the position of the short circuit is near the stop position of the conductive cotton; if the second resistor is the same as the first resistor, the conductive cotton is slowly moved along the direction close to the measuring position of the multimeter until the conductive cotton stops moving when the resistance value begins to change, and the position of the short circuit is close to the stop position of the conductive cotton.
2. The method for finding the short-circuit position of the silver paste according to claim 1, wherein the method comprises the following steps: the conductive cloth or the conductive cotton is made of flexible materials.
3. A method for searching an open circuit position of silver paste is characterized by comprising the following steps:
(1) firstly, confirming a bad silver paste channel by adopting software, and determining a range containing the bad silver paste channel after judging that the circuit is open;
then measuring and recording the resistance of the adjacent 2 silver paste channels at the end parts of the silver paste channels by using a universal meter, wherein one of the adjacent 2 silver paste channels is an open-circuit channel, and the other one is a normal channel, and the universal meter displays no resistance at the moment;
(2) the method comprises the following steps of (1) short-circuiting the middle positions of circuits of 2 adjacent silver paste channels by adopting flexible conductive cotton, measuring a resistor, moving the conductive cotton according to the existence of a display resistance value of a universal meter until the display result of the universal meter is changed, and determining the relative accurate position of the short circuit;
(3) after the relative accurate position of the bad position is determined through the steps, the accurate position of the open circuit is found out through visual inspection;
the method for displaying the existence of the movable conductive cotton according to the resistance value of the multimeter comprises the following steps: if the multimeter displays a resistor, slowly moving the conductive cotton to the far end of the measuring position of the multimeter until the resistor disappears and stops moving the conductive cotton, and the open circuit position is close to the stop position of the conductive cotton; if the multimeter shows no resistance, the conductive cotton is slowly moved toward the proximal end of the multimeter measurement location until the multimeter shows a resistance, and the open circuit location is near the conductive cotton stop location.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911271584.5A CN111007432B (en) | 2019-12-12 | 2019-12-12 | Method for searching open short circuit position of silver paste |
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| CN201911271584.5A CN111007432B (en) | 2019-12-12 | 2019-12-12 | Method for searching open short circuit position of silver paste |
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| CN111007432B true CN111007432B (en) | 2022-06-17 |
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| JP4562358B2 (en) * | 2003-07-04 | 2010-10-13 | 株式会社ユニオンアロー・テクノロジー | Conductive pattern inspection device |
| CN103063976B (en) * | 2012-12-28 | 2016-12-28 | 中国科学院深圳先进技术研究院 | A kind of use two way classification that silicon through hole is carried out the method and system of fault detect |
| CN104020387A (en) * | 2014-05-09 | 2014-09-03 | 东莞市五株电子科技有限公司 | Method for finding short circuit point on printed circuit board |
| CN106908713B (en) * | 2017-02-23 | 2019-10-22 | 深圳崇达多层线路板有限公司 | A kind of determination method of wiring board internal layer circuit short circuit reason |
| CN107907781B (en) * | 2017-11-30 | 2021-01-29 | 华显光电技术（惠州）有限公司 | Method for judging open circuit position of circuit and broken circuit detection equipment |
| CN108646127B (en) * | 2018-04-19 | 2021-04-02 | 张家港康得新光电材料有限公司 | Touch screen short circuit position detection structure and detection method |
| CN109142988B (en) * | 2018-11-13 | 2020-08-04 | 广东电网有限责任公司 | Distribution network fault positioning method and system based on power quality monitoring data |
| CN109490758B (en) * | 2018-12-12 | 2020-12-15 | 上海华力集成电路制造有限公司 | Short circuit failure positioning method |
| CN109444650B (en) * | 2018-12-28 | 2021-07-30 | 深圳市欧珀达科技有限公司 | Open-short circuit testing method and device for single film of oversized capacitive screen |
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