CN212379544U - Short circuit detection circuit of display module - Google Patents
Short circuit detection circuit of display module Download PDFInfo
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- CN212379544U CN212379544U CN202020762685.4U CN202020762685U CN212379544U CN 212379544 U CN212379544 U CN 212379544U CN 202020762685 U CN202020762685 U CN 202020762685U CN 212379544 U CN212379544 U CN 212379544U
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Abstract
The utility model belongs to the technical field of show, a display module's short circuit detection circuitry is disclosed, this circuit includes: the test switch is electrically connected with the output contact point of the display module; a selection switch electrically connected to the test switch; the device comprises a first resistor, a second resistor and an ADC module, wherein the first resistor is connected to GND, the second resistor is connected to VREF, and the ADC module is used for collecting and quantifying voltage at the connection position of the second resistor and the selection switch. The utility model discloses, connect the output contact point through test switch, select switch selects to connect first resistance or second resistance according to the test needs, and through the quantization result of ADC module, judge whether short circuit of output current detection output contact point, adopt this short circuit detection circuitry can in time and detect out the defective products that produce because of output contact point short circuit high-efficiently in display module assembly production process, practiced thrift manufacturing cost greatly.
Description
Technical Field
The utility model belongs to the technical field of show, especially, relate to a display module assembly's short circuit detection circuitry.
Background
Currently, with the maturation of in-cell touch screen technology, TFT-LCD glass has now turned fully to in-cell solutions. In the mobile phone industry, more than 10 hundred million mobile phones are produced globally every year, wherein about half of the mobile phones adopt glass embedded with a touch screen technology; in industries such as industrial control, household appliances and automobiles, the scheme of the embedded touch screen technology is more and more widely accepted. In other words, the current middle and small size display technology, the pure LCD display technology, is gradually eliminated, and the TFT-LCD glass used in various industries will gradually transition to the embedded touch screen technology.
The embedded touch screen technology is widely applied in the market at present and in the next few years, however, some problems existing in the production of the embedded touch screen technology are increasingly difficult to accept, for example, in the production process of a display module, when a chip of the embedded touch screen technology is bonded to glass in a Chip On Glass (COG) mode, short circuit is easily generated, and the product is poor.
Similarly, for a display module of the non-embedded touch screen technology, especially an AMOLED display module (Active Matrix Organic Light Emitting Diode panel), if the number of output PADs reaches a certain number, the interval between the PADs is decreased, which is easy to cause short circuit between the PADs and the trace, and the PADs are the contact points between the display substrate and the display driving chip or the display touch control chip.
If the problem products cannot be detected in the current working procedure, if the problem products are finally made into finished products and then detected, the display module is scrapped or reworked, and therefore waste is generated.
In view of the above, it is highly desirable to detect the defective products caused by short circuit in time and efficiently during the production process of the display module, so as to prevent the high cost caused by the problem discovered and solved in the following processes.
SUMMERY OF THE UTILITY MODEL
The utility model provides a display module assembly's short circuit detection circuitry aims at solving current display module assembly and is difficult in time and detect in high efficiency in process of production and produce more defective products because of the short circuit, and rediscovery solution cost can very high problem in later process.
The utility model discloses a realize like this, a short circuit detection circuitry of display module assembly, include: the test switch is electrically connected with the output contact point of the display module; a selection switch electrically connected to the test switch; the first resistor is connected to GND, the second resistor is connected to VREF, the ADC module is used for collecting and quantifying voltage at the connection position of the second resistor and the selection switch, during short-circuit detection, the test switch is in a closed state, part of sub-switches of the selection switch, which are in butt joint with the current detection output contact points, are closed and connected to the second resistor, other groups of sub-switches of the selection switch, which are in butt joint with other remaining output contact points, are closed and connected to the first resistor, and the ADC module is used for collecting and quantifying whether the voltage at the connection position of the second resistor and the selection switch is close to the VREF, so that whether the current detection output contact point of the display module is short-circuited or not is obtained.
Furthermore, the current detection output contact point is a row of output contact points or a single output contact point which is correspondingly arranged on the display module.
Further, the selection switch and the test switch are a plurality of groups of switches.
Furthermore, the selection switch or/and the test switch are/is switched off, the short circuit detection circuit of the display module is in a non-detection state, and the display module normally works.
Further, the display module assembly includes: a pure display LCD module, a pure display AMOLED module, an embedded touch LCD module or an embedded touch AMOLED module.
The embodiment of the utility model provides a connect the output contact point through test switch, select switch selects to connect first resistance or second resistance according to the test needs, through the quantization result of ADC module, judges whether the output detects the output contact point short circuit at present, adopts this short circuit detection circuitry, can in time and high-efficiently detect out the defective products that produce because of the output contact point short circuit in display module assembly production process, has practiced thrift manufacturing cost greatly.
Drawings
In order to more clearly illustrate the technical utility model in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a display module according to an embodiment of the present invention;
fig. 2 is a structural diagram of a short circuit detection circuit of a display module according to an embodiment of the present invention;
fig. 3 is an equivalent circuit diagram of a short circuit detection circuit of a display module according to an embodiment of the present invention in a detection state;
fig. 4 is an equivalent circuit diagram of the display module according to the embodiment of the present invention when no short circuit occurs in the short circuit detection process;
fig. 5 is an equivalent circuit diagram of the display module according to the embodiment of the present invention during short circuit detection;
fig. 6 is an equivalent circuit diagram of the short circuit detection circuit of the display module according to the embodiment of the present invention under the non-detection state.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 shows the structure of the display module assembly detected by the embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and the detailed description is as follows:
this display module assembly includes: the display driving chip 200 or the display touch control chip 200; the PAD is bonded to the display substrate 100 by a bonding process, the PAD101 is a contact point between the display substrate 100 and the display driver chip 200, and the connection line 102 is a trace connected to the display area 300. The display module assembly includes: a pure display LCD module, a pure display AMOLED module, an embedded touch LCD module or an embedded touch AMOLED module.
Fig. 2 shows a structure of a short circuit detection circuit of a display module according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
the short circuit detection circuit of display module assembly includes: a test switch 202 electrically connected to the display module output contact point 101; a selection switch 201 electrically connected to the test switch 202; the first resistor 203 is connected to GND, the second resistor 204 is connected to VREF, the ADC module is configured to collect and quantize a voltage at a connection point of the second resistor 204 and the selection switch 201, when the selection switch 201 and the test switch 202 perform short-circuit detection for multiple groups of switches, the test switch 202 is in a closed state, a part of sub-switches of the selection switch 201, which currently detect that an output contact point is in butt joint, are closed and connected to the second resistor 204, other groups of sub-switches of the selection switch 201, which other remaining output contact points are in butt joint, are closed and connected to the first resistor 203, and the ADC module is configured to collect and quantize whether a voltage at a connection point of the second resistor 204 and the selection switch 201 is close to VREF, so as to obtain whether the currently detected output contact point of the display module is short-circuited, fig. 3 shows an equivalent circuit of the short circuit detection circuit of the display module in the detection state, when the short circuit detection is performed, the test switches 202 are all in the closed state, 4 groups of sub-switches of the selection switch 201 are provided, one group of sub-switches connects the first row of display module output contact points 101 to VREF through the second resistor 203, the other three groups of sub-switches connect the remaining three rows of display module output contact points 101 to GND through the first resistor 203, and then the ADC module 205 collects and quantizes the voltage at the connection of R2 and the switches. If there is no short circuit, the equivalent circuit is shown in FIG. 4, and if there is a short circuit, the equivalent circuit is shown in FIG. 5. Thus, by determining the quantization result of the ADC block 205, it can be determined whether there is a short circuit. If the quantized value of the ADC block 205 is near the quantized value of VREF, then there is no short circuit, otherwise a short circuit condition occurs. In addition, the severity of the short circuit can also be determined from the quantized value of the ADC block 205.
Furthermore, the current detection output contact point is a row of output contact points or a single output contact point which are correspondingly arranged on the display module, wherein the number of the row is 4. As shown in fig. 3, it is possible to detect the output contacts 101 in different rows and whether there is a short circuit between them, and the detection can be completed only 4 times. If the short circuit condition of each output contact point 101 is to be detected, for example, the short circuit condition of the output contact point 101 in the first row, the selection switches 201 corresponding to the output contact points 101 in the first row may be sequentially closed, and the detection may be performed once every time the selection switches are closed.
As shown in fig. 6, in a non-detection state, the selection switch 201 or/and the test switch 202 is turned off, and the display module output contact point 101 is not connected to the short circuit detection circuit of the display module, so that the display driving chip 200 or the display touch control chip 200 is not affected to normally control the display module.
The embodiment of the utility model provides a connect the output contact point through test switch, select switch selects to connect first resistance or second resistance according to the test needs, through the quantization result of ADC module, judges whether the output detects the output contact point short circuit at present, adopts this short circuit detection circuitry, can in time and high-efficiently detect out the defective products that produce because of the output contact point short circuit in display module assembly production process, has practiced thrift manufacturing cost greatly.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. The utility model provides a short circuit detection circuitry of display module assembly which characterized in that, the short circuit detection circuitry of display module assembly includes: a test switch 202 electrically connected to the display module output contact point 101; a selection switch 201 electrically connected to the test switch 202; the test circuit comprises a first resistor 203, a second resistor 204 and an ADC module 205 which are connected with the selection switch 201, wherein the first resistor 203 is connected to GND, the second resistor 204 is connected to VREF, the ADC module is used for collecting and quantizing the voltage at the connection position of the second resistor 204 and the selection switch 201, during short-circuit detection, the test switch 202 is in a closed state, part of sub-switches of the selection switch 201 which are currently used for detecting the butt joint of output contact points are closed and connected to the second resistor 204, other groups of sub-switches of the selection switch 201 which are in butt joint with other remaining output contact points are closed and connected to the first resistor 203, and the ADC module is used for collecting and quantizing whether the voltage at the connection position of the second resistor 204 and the selection switch 201 is close to VREF, so as to further obtain whether the current detection output contact points of the display.
2. The short circuit detection circuit of claim 1, wherein the currently detected output contact is a row of output contacts or a single output contact arranged corresponding to the display module.
3. The short circuit detection circuit of a display module according to claim 1, wherein the selection switch 201 and the test switch 202 are a plurality of switches.
4. The short circuit detection circuit of the display module according to claim 1, wherein the selection switch 201 and/or the test switch 202 is turned off, and the display module operates normally when the short circuit detection circuit of the display module is in a non-detection state.
5. The short circuit detection circuit of claim 1, wherein the display module comprises: a pure display LCD module, a pure display AMOLED module, an embedded touch LCD module or an embedded touch AMOLED module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020762685.4U CN212379544U (en) | 2020-05-09 | 2020-05-09 | Short circuit detection circuit of display module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020762685.4U CN212379544U (en) | 2020-05-09 | 2020-05-09 | Short circuit detection circuit of display module |
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| CN212379544U true CN212379544U (en) | 2021-01-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466738A (en) * | 2021-05-31 | 2021-10-01 | 广东朝阳电子科技股份有限公司 | Short circuit detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466738A (en) * | 2021-05-31 | 2021-10-01 | 广东朝阳电子科技股份有限公司 | Short circuit detection circuit |
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