CN113889013A - Panel crack detection circuit and method, display module and device - Google Patents
Panel crack detection circuit and method, display module and device Download PDFInfo
- Publication number
- CN113889013A CN113889013A CN202111365961.9A CN202111365961A CN113889013A CN 113889013 A CN113889013 A CN 113889013A CN 202111365961 A CN202111365961 A CN 202111365961A CN 113889013 A CN113889013 A CN 113889013A
- Authority
- CN
- China
- Prior art keywords
- crack detection
- panel
- current
- detection line
- signal
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 206
- 238000000034 method Methods 0.000 title abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 45
- 238000012544 monitoring process Methods 0.000 claims description 24
- 238000005520 cutting process Methods 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 8
- 208000037656 Respiratory Sounds Diseases 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 239000004642 Polyimide Substances 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000565 sealant Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Abstract
The application relates to a panel crack detection circuit, a method, a display module and a device, wherein the panel crack detection circuit comprises: crack detection lines and flexible circuit boards; the crack detection line is positioned in a non-display area of the panel and partially surrounds a display area of the panel, a first end of the crack detection line is connected with a first end of the flexible circuit board, and a second end of the crack detection line is connected with a connector pin of the flexible circuit board; the first end of the flexible circuit board is connected with the grounding area of the flexible circuit board; the connector pin of the flexible circuit board is used for providing a test voltage signal to the first end of the crack detection line and detecting a current signal of the crack detection line; the current signal is used to determine a crack detection result of the panel. The application solves the problem that poor interlacing and the like caused by microcrack extension of panel cracks of the display module are poor, and the reliability of the display module is improved.
Description
Technical Field
The embodiment of the application relates to the technical field of display, in particular to a circuit and a method for detecting panel cracks, a display module and a device.
Background
Generally, the damage of the liquid crystal display screen product can only be observed by human eyes carefully, and for the medium-sized and large-sized liquid crystal display screen products, the detection efficiency and the detection accuracy are relatively low; moreover, the panel in the module state is usually covered by a backlight, an adhesive Tape (Tape) and other materials, which brings great difficulty to the panel state inspection by inspectors in the module state, and even some panel products which are already damaged cannot be effectively detected, so that the damaged panel flows to a back-end production flow or even a market end. It is thus clear that the current adoption people's eye discerns that the panel breaks and takes place to leak to examine easily, can't effectively intercept the panel that has the crackle in advance, finally influences the demonstration of display module assembly, perhaps, causes display device's reliability to reduce, thereby influence display device's complete machine yields.
Disclosure of Invention
In view of the above, in order to solve the above technical problems or some of the technical problems, embodiments of the present application provide a circuit and a method for detecting a panel crack, a display module, and an apparatus.
In a first aspect, an embodiment of the present application provides a panel crack detection circuit, including: crack detection lines and flexible circuit boards; the crack detection line is positioned in a non-display area of the panel and partially surrounds a display area of the panel, a first end of the crack detection line is connected with a first end of the flexible circuit board, and a second end of the crack detection line is connected with a connector pin of the flexible circuit board; the first end of the flexible circuit board is connected with the grounding area of the flexible circuit board; the connector pin of the flexible circuit board is used for providing a test voltage signal to the first end of the crack detection line and detecting a current signal of the crack detection line; the current signal is used to determine a crack detection result of the panel.
In a possible implementation manner, array substrate row driving wires are arranged in the non-display area; the crack detection line is arranged between the edge line of the panel and the array substrate line driving routing, and the distance between the crack detection line and the edge line of the panel is larger than a preset cutting distance threshold value.
In one possible embodiment, the line width of the crack detection line is smaller than a preset detection line width threshold value.
In a possible implementation manner, the panel crack detection circuit further includes a lighting monitoring module connected to the connector pin; the lighting monitoring module is used for outputting the test voltage signal to a connector pin of the flexible circuit board during lighting detection, and generating a crack detection result of the panel according to a current signal of the crack detection line.
In one possible embodiment, the crack detection result of the panel is divided into a breakage detection result and a normal detection result; the lighting monitoring module generates a crack detection result of the panel according to the current signal of the crack detection line, and the lighting monitoring module comprises: determining a current value of the current signal; if the current value of the current signal is smaller than the current threshold value corresponding to the test voltage signal, generating the damage detection result; and if the current value of the current signal is not less than the current threshold corresponding to the test voltage signal, generating a normal detection result.
In a possible implementation manner, the current threshold is a current value determined according to a voltage value of the test voltage signal, an equivalent resistance value of the crack detection line, and a binding resistance value, where the binding resistance value is a binding resistance value of the flexible circuit board corresponding to the connector pin; the test voltage signal is one path of output power supply signal of the lighting equipment, and the one path of power supply signal is a voltage signal required by abnormal lighting.
In a second aspect, an embodiment of the present application provides a display module, including the panel crack detection circuit according to any one of the first aspects.
In a third aspect, an embodiment of the present application provides a display device, including the display module according to the second aspect.
In a third aspect, an embodiment of the present application provides a panel crack detection method, including:
providing a test voltage signal to a first end of the crack detection line; the crack detection line is positioned in a non-display area of the panel and partially surrounds a display area of the panel, a first end of the crack detection line is connected with a first end of the flexible circuit board, and a second end of the crack detection line is connected with a connector pin of the flexible circuit board;
detecting a current signal of the crack detection line through the connector pin;
and determining the crack detection result of the panel according to the current signal.
In one possible embodiment, the dividing the crack detection result into a breakage detection result and a normal detection result, and the determining the crack detection result of the panel according to the current signal includes: determining a current value of the current signal; if the current value of the current signal is smaller than the current threshold value corresponding to the test voltage signal, generating a damage detection result; and if the current value of the current signal is not less than the current threshold corresponding to the test voltage signal, generating a normal detection result.
In a possible embodiment, the determining the crack detection result of the panel according to the current signal further comprises: obtaining an equivalent resistance value and a binding resistance value of the crack detection line, wherein the binding resistance value is a flexible circuit board binding resistance value corresponding to the connector pin; and determining the current threshold according to the equivalent resistance value, the binding resistance value and the voltage value of the test voltage signal, wherein the test voltage signal is one path of output power signal of the lighting equipment, and the one path of power signal is a voltage signal required by abnormal lighting.
The circuit, the method, the display module and the device for detecting the panel cracks provided by the embodiment of the application enable the first end of the crack detection line which is positioned in the non-display area of the panel and partially surrounds the display area to be connected with the first end of the flexible circuit board, enable the first end of the crack detection line to be connected with the grounding area of the flexible circuit board through the first end of the flexible circuit board, and enable the second end of the crack detection line to be connected with the connector pin of the flexible circuit board, so that a test voltage signal can be provided to the first end of the crack detection line through the connector pin of the flexible circuit board, enable a loop between the first end of the crack detection line and the grounding area of the flexible circuit board to generate a corresponding current signal, and further enable the current signal of the crack detection line to be detected through the connector pin, so as to judge whether the panel has cracks or not in real time and fast according to the current magnitude of the current signal, whether the panel has the damage can be judged out fast in real time, and then can effectively intercept the panel that has the crackle in advance, solved display module assembly because of the crackle of panel microcrack extend the bad problem such as interlace that leads to, improve display module assembly's reliability, improve display module assembly and assemble display device's complete machine yields.
Drawings
Fig. 1 is a schematic structural diagram of a display module according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a panel and a flexible printed circuit board according to an example of the present application
FIG. 3 is a schematic view of a crack detection line and circuit model in an example of the present application under different conditions;
FIG. 4 is a schematic view of another crack detection line and circuit model in an example of the present application under different conditions;
FIG. 5 is a schematic diagram of a crack detection circuit of a panel according to an embodiment of the present disclosure;
FIG. 6 is a flowchart illustrating steps of a method for detecting cracks in a panel according to an embodiment of the present disclosure;
fig. 7 is a block diagram of a display device according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the actual production process, the display Panel is easy to Crack under the action of stress, for example, the Panel (Panel) is damaged by corner breakage, cracks and the like in the manufacturing process, and the display effect on the Panel is obvious. The display of the display device is finally affected by adverse effects such as interlacing caused by microcrack extension of panel cracks, and the customer experience is reduced. For example, as the requirement of the terminal customer for the quality of the narrow-bezel mobile phone product is higher, if the narrow-bezel mobile phone has poor quality such as interlacing caused by the extension of microcracks of panel cracks at the market end, the terminal customer may strongly complain about the quality of the narrow-bezel mobile phone, which affects the quality image of the display device manufacturer.
In view of the above, one of the core concepts of the embodiments of the present application is to provide a circuit, a method, a display module and a device for detecting cracks of a panel, in which crack detection lines disposed around the panel are connected to a test power supply and a ground reference (GND) through a Flexible Printed Circuit (FPC) to form a loop through which current can pass, so that whether the panel is damaged can be determined in real time by monitoring the current on the loop, the panel with cracks can be intercepted in advance, problems of interlacing and the like caused by the extension of microcracks of the panel cracks can be solved, and the reliability of the display module can be improved.
For the purpose of facilitating understanding of the embodiments of the present application, the following description will be made in terms of specific embodiments with reference to the accompanying drawings, which are not intended to limit the embodiments of the present application.
Referring to fig. 1, a schematic structural diagram of a display module provided in an embodiment of the present application is shown. Illustratively, as shown in fig. 1, the panel crack detection circuit provided by the embodiment of the present application includes: a crack detection line 110 and a flexible wiring board 120. Wherein the crack detection line 110 is located in a non-display area 130 of a panel and partially surrounds a display area 140 of the panel, a first end 111 of the crack detection line is connected with a first end of the flexible circuit board, and a second end of the crack detection line is connected with a connector pin CNN of the flexible circuit board; the first end of the flexible circuit board is connected with the grounding area 121 of the flexible circuit board; the connector pin CNN of the flexible circuit board is used for providing a test voltage signal to the first end 111 of the crack detection line and detecting a current signal of the crack detection line; and the current signal is used to determine a crack detection result of the panel. Wherein the non-display region 130 may include a first non-display region 131 and a second non-display region 132, the first non-display region 131 may be disposed around the display region 140, and the second non-display region 122 may be referred to as a step region; the first non-display area 121 may have scan driving lines, data driving lines, and the like disposed therein, which is not particularly limited in the embodiment of the present application.
It can be seen that, in the panel crack detection circuit provided in the embodiment of the present application, the first end of the crack detection line 110, which is located in the non-display region 130 of the panel and partially surrounds the display region 140, is connected to the first end of the flexible printed circuit board 120, so that the first end of the crack detection line 110 can be connected to the ground region 121 of the flexible printed circuit board through the first end of the flexible printed circuit board 120, and the second end of the crack detection line is connected to the connector pin CNN of the flexible printed circuit board 120, so that a test voltage signal can be provided to the first end of the crack detection line 110 through the connector pin CNN of the flexible printed circuit board 120, a corresponding current signal is generated in a loop between the first end of the crack detection line 110 and the ground region 121 of the flexible printed circuit board 120, and then the current signal of the crack detection line 110 can be detected through the connector pin CNN, so as to quickly determine whether a crack exists in the panel in real time according to the current magnitude of the current signal, whether the panel has the damage can be judged out fast in real time, and then can effectively intercept the panel that has the crackle in advance, solved display module assembly because of the crackle of panel microcrack extend the bad problem such as interlace that leads to, improve display module assembly's reliability, improve display module assembly and assemble display device's complete machine yields.
In a specific implementation, the panel in the embodiment of the present application may be a display panel, and a circle of traces may be disposed on the periphery of the panel for monitoring the state of the panel, as shown in fig. 2, a circle of traces GND _ ESD disposed on the periphery of the panel may be used as a crack detection line 110 for monitoring the state of the panel; when the panel cracks, the wiring GND _ ESD is disconnected (Open), and two ends of the wiring GND _ ESD are respectively connected to the end 1 and the end 2 of the FPC; wherein, the end 1 is used as the first end of the flexible circuit board 120 and is connected with the GND on the FPC; the terminal 2 is used as the second terminal of the flexible circuit board 120, and is connected to a Pin of a Carbon Nanotube (CNT) lead (Pin) of the FPC, the Pin is used as a connector Pin CNN, a corresponding connection signal on the whole machine is a GND signal, the Pin is connected with a power supply (required by abnormal lighting) output by a lighting machine through a connection switching FPC during lighting inspection of a Liquid Crystal Display Module (LCM), namely, the corresponding connection signal during the lighting inspection of the LCM is a power supply signal output by the lighting machine, so that the power supply signal can be used as a test voltage signal provided by the connector Pin CNN to the first terminal 111 of a crack detection line, a loop is formed from the power supply of the lighting machine to the upper terminal 1 of the FPC, whether the wiring of a resistance state panel on the loop has cracks can be judged by monitoring the current state on the loop, namely, the current signal of the crack detection line on the loop is monitored, and determining the crack detection result of the panel according to the current value of the current signal.
In actual processing, the crack detection line 110 in the embodiment of the present application may be disposed on the panel, for example, the crack detection line 110 may be located at the outermost side of the panel, and the traces close to the crack detection line 110 may be Gate Driver on array (GOA) traces. It should be noted that when a part of the GOA traces are broken, the panel or the display module will have poor functionality.
Optionally, on the basis of meeting the requirement of electrostatic Discharge (ESD), the outermost coil of wires may be moved outward, that is, on the basis of meeting the requirement of ESD, the crack detection line 110 serving as the outermost coil of wires may be moved outward to be closer to the edge of the panel; and the line width of the crack detection line 110 is as narrow as possible to improve the crack detection rate. For example, as shown in fig. 3, the resistance value Rtotal in the normal state of the crack detection line having a relatively wide line width is 3R, and the resistance value in the state where the microcrack exists is 3.5R; the crack detection line with a relatively narrow line width has a resistance value Rtotal of 6R in a normal state, as shown in fig. 4, and an infinite resistance value in a state where microcracks exist. Therefore, under the condition that the panel has microcracks, crack detection lines with narrow line widths are easier to be completely disconnected compared with crack detection lines with wide line widths, and the corresponding loop routing wires have larger resistance and current change, so that the defect judgment and interception are easier. Further, the line width of the crack detection line in the embodiment of the present application may be smaller than a preset detection line width threshold. The detection linewidth threshold may be set according to the accuracy of the device, for example, may be set to 5 micrometers (um), and the like, which is not specifically limited in this embodiment of the application.
In a specific implementation, the non-display area 130 of the panel in the embodiment of the present application may be provided with row driving traces of an array substrate; the crack detection line 110 may be between an edge line of the panel and the array substrate row drive traces, and a distance between the crack detection line 110 and the edge line of the panel may be greater than a preset cutting distance threshold. The Cutting distance threshold may be determined according to the Cutting precision requirement, for example, the minimum distance threshold between the Cutting line and the GND trace may be determined as the Cutting distance threshold according to the Cutting precision requirement.
Specifically, the panel in the embodiment of the present application may include a display substrate, and a Black Matrix ((Black Matrix, BM)) may be formed on the display substrate, when the larger display panel is cut, it needs to be cut next to the BM, so that the BM in each display panel obtained is located at the edge of the display substrate, and the BM is exposed at the side of the display panel, for example, in the case of BM trimming, the Film structure with the discharge position exposed outside is BM, and a protective (over coating, OC), a Polyimide (PI) and a sealing (Sealant) glue are coated, among the materials BM, OC, PI and Sealant, the BM resistivity is the lowest, when static electricity is released, the BM resistivity is selectively released, jumps to the peripheral GOA through the BM to cause the burnt out of the trace, and when BM is not trimmed, ESD is released on the Thin Film Transistor (TFT) Glass (Glass), and can puncture the Sealant glue and release to GND and GOA, cause the line to burn out.
Based on the specific design rule of the distance d1 between the BM and the edge when the BM is flush, the distance d2 between the GND line and the edge when the BM is not flush, and the combination that the BM is located on Color Filter (CF) glass and the GND is located on TFT glass, the cutting distance threshold can be set to be the minimum distance threshold between the GND line and the edge line of the panel, for example, the cutting distance threshold can be set to be 141.68 micrometers, and the like, which is not particularly limited by the embodiment of the present application.
On the basis of the foregoing embodiment, optionally, the panel crack detection circuit provided in the embodiment of the present application may further include a lighting monitoring module connected to the connector pin; the lighting monitoring module is used for outputting the test voltage signal to a connector pin of the flexible circuit board during lighting detection, and generating a crack detection result of the panel according to a current signal of the crack detection line. Among them, the crack detection result of the panel can be divided into a breakage detection result and a normal detection result. Further, the lighting monitoring module in the embodiment of the present application generates the crack detection result of the panel according to the current signal of the crack detection line, and specifically may include: determining a current value of the current signal; if the current value of the current signal is smaller than the current threshold value corresponding to the test voltage signal, generating the damage detection result; and if the current value of the current signal is not less than the current threshold corresponding to the test voltage signal, generating a normal detection result. The current threshold is a current value determined according to a voltage value of the test voltage signal, an equivalent resistance value of the crack detection line and a binding resistance value, and the binding resistance value is a binding resistance value of the flexible circuit board corresponding to the connector pin; the test voltage signal is one path of output power supply signal of the lighting equipment, and the one path of power supply signal is a voltage signal required by abnormal lighting.
For example, when the lighting monitoring device includes a lighting device, the lighting device may be used as the lighting device. During LCM lighting inspection, the connector pin CNN may be connected to a power supply (required for abnormal lighting) output by the lighting machine through the connection transfer FPC, so that the connector pin CNN may provide a test voltage signal V to the first end of the crack detection line 110 based on the power supply output by the lighting machine, as shown in fig. 5, so that the lighting machine may monitor the current signal I of the crack detection line 110 through the connector pin CNN, and further may quickly determine whether the panel has cracks in real time according to the current magnitude of the current signal, for example, may determine whether the panel has cracks by determining whether the current magnitude of the current signal deviates from a preset current lower limit value. R1 in fig. 5 may be used to indicate the flexible circuit board binding resistance corresponding to the connector pin, such as an FPC binding resistance; r2 may be used to represent the equivalent resistance of a crack detection line, which may contain panel traces.
Specifically, when the panel is wired normally, the resistance on the loop corresponding to the crack detection line 110 is monitored to be in the kiloohm (K Ω) level, and the current on the loop is relatively large, that is, the current value of the current signal of the crack detection line 110 is relatively large, for example, the current value of the current signal is in the milliampere (mA) level; when the panel trace has cracks, the resistance on the monitoring loop is ∞, and the current on the loop is extremely small, for example, the current value of the current signal of the crack detection line 110 is microampere (uA). In this example, the lower current limit may be set to serve as a current threshold for determining whether a crack exists, so that when the current value of the current signal of the crack detection line 110 is lower than the preset current limit, the device may be triggered to alarm, that is, it may be determined that a crack exists around the panel and degradation rejection should be intercepted.
For example, in the case of a Panel crack detection circuit as a Panel monitoring circuit, on the Panel monitoring circuit, a test voltage signal V may be provided to the first end of the crack detection line 110 of the Panel by using the lighting machine VDD path voltage through the lighting monitoring module to determine the crack detection result of the Panel by monitoring whether the current value of the current signal of the crack detection line 110 is lower than a preset current threshold value. Specifically, under the condition that the voltage of the lighting machine VDD path is 3.3V, the lower limit value of the loop current of 1.2mA may be set as a current threshold corresponding to the test voltage signal, so that whether the crack detection line 110 is normal may be determined by determining whether the current value of the current signal of the crack detection line 110 is lower than 1.2 mA; if the Panel monitoring wiring is normal, namely when the crack detection line 110 is normal, the current value of the current signal of the crack detection line 110 is detected to be not lower than 1.2mA, and if the current value of the current signal of the crack detection line 110 is detected to be 1.28mA, namely the current on the monitoring loop is about 1.28mA and does not exceed the preset lower limit value of the loop current, a normal detection result is generated, so that the next processing is carried out based on the normal detection result, the lighting machine does not give an alarm, and the normal power-on display can be carried out; if the Panel monitors the trace Open, that is, if there is a crack around the Panel, it may be detected that the current value of the current signal of the crack detection line 110 is lower than 1.2mA, and if the current value of the current signal of the crack detection line 110 is detected to be 90uA, that is, the current on the monitoring loop is about 90uA and exceeds the preset lower limit of the loop current, a damage detection result is generated, and further processing is performed based on the damage detection result, such as a lighting machine alarm, and power is turned off, so as to determine whether there is a crack on the Panel.
In summary, in the panel crack detection circuit in the embodiment of the present application, the first end 111 of the crack detection line is connected to the first end of the flexible printed circuit board, so that the first end 111 of the crack detection line can be connected to the ground area of the flexible printed circuit board through the first end of the flexible printed circuit board, and the second end of the crack detection line is connected to the connector pin of the flexible printed circuit board, so that the test voltage signal can be provided to the first end 111 of the crack detection line through the connector pin of the flexible printed circuit board, so that a loop between the first end 111 of the crack detection line and the ground area of the flexible printed circuit board generates a corresponding current signal, and the current signal of the crack detection line can be detected through the connector pin, so as to quickly determine whether the panel has cracks according to the current magnitude of the current signal in real time, i.e. quickly determine whether the panel has cracks or not, and then can effectively intercept the panel that has the crackle in advance, solve display module assembly because of the bad problems such as the interlace that the crazing line extension of panel crackle leads to, improve display module assembly's reliability, improve display module assembly and assemble display device's complete machine yields.
Further, this application embodiment still provides a display module assembly, includes: the panel crack detection circuit according to any of the above embodiments of the present application. Because the principle of the display module for solving the problems is similar to that of the panel crack detection circuit, the implementation of the panel crack detection circuit of the display module can be seen in the implementation of the panel crack detection circuit in the previous example, and repeated details are not repeated.
Referring to fig. 6, a flowchart illustrating steps of a method for detecting a crack in a panel according to an embodiment of the present application is shown. The panel crack detection method provided by the embodiment of the application can be applied to a display module or a display device, and specifically can comprise the following steps:
the crack detection line is positioned in a non-display area of the panel and partially surrounds a display area of the panel, a first end of the crack detection line is connected with a first end of the flexible circuit board, and a second end of the crack detection line is connected with a connector pin of the flexible circuit board;
It can be seen that the embodiments of the present application provide a test voltage signal to a first end of a crack detection line of a panel, and detect a current signal of the crack detection line through a connector pin, so as to determine the crack detection result of the panel according to the current signal, thereby rapidly judging whether the panel is damaged or not in real time, furthermore, the panel with cracks can be effectively intercepted in advance, for example, the power supply signal provided by the power supply of the lighting machine can be used as the test voltage signal, so as to combine the crack detection and lighting monitoring of the panel, and the device can automatically and rapidly judge whether the panel is damaged or not according to the current magnitude without additional personnel for operation, thereby effectively reducing the labor cost, meanwhile, the problem that in the prior art, due to the fact that the FPC upper measuring points are shielded, the crack of the panel cannot be detected by testing the resistance or voltage between the FPC upper measuring points is solved.
Further, the determining the crack detection result of the panel according to the current signal may specifically include: determining a current value of the current signal; if the current value of the current signal is smaller than the current threshold value corresponding to the test voltage signal, generating a damage detection result; and if the current value of the current signal is not less than the current threshold corresponding to the test voltage signal, generating a normal detection result.
Optionally, the determining the crack detection result of the panel according to the current signal may further include: obtaining an equivalent resistance value and a binding resistance value of the crack detection line, wherein the binding resistance value is a flexible circuit board binding resistance value corresponding to the connector pin; and determining the current threshold according to the equivalent resistance value, the binding resistance value and the voltage value of the test voltage signal, wherein the test voltage signal is one path of output power signal of the lighting equipment, and the one path of power signal is a voltage signal required by abnormal lighting.
Further, this application embodiment still provides a display device, includes the display module assembly that this application embodiment provided. As shown in fig. 7, the display device 700 includes: a display module 710; the display module 710 may be the display module described in the above embodiments. In a specific implementation, the display device may be a display, a mobile phone, a television, a notebook computer, electronic paper, a digital photo frame, a navigator, an all-in-one machine, and the like, which is not particularly limited in this application.
Optionally, the display device provided in the embodiment of the present application may further include: a processor, and a memory for storing executable instructions for the processor; wherein the processor is configured to perform the panel crack detection method as described in any one of the above method embodiments.
The present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the panel crack detection method according to any one of the above-mentioned method embodiments.
It should be noted that, as for the embodiments of the method, the display module, the display device, and the storage medium, since they are basically similar to the circuit embodiments, the description is relatively simple, and the relevant points can be referred to the partial description of the circuit embodiments.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above-mentioned embodiments, objects, technical solutions and advantages of the present application are described in further detail, it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (11)
1. A panel crack detection circuit, comprising: crack detection lines and flexible circuit boards;
the crack detection line is positioned in a non-display area of the panel and partially surrounds a display area of the panel, a first end of the crack detection line is connected with a first end of the flexible circuit board, and a second end of the crack detection line is connected with a connector pin of the flexible circuit board;
the first end of the flexible circuit board is connected with the grounding area of the flexible circuit board;
the connector pin of the flexible circuit board is used for providing a test voltage signal to the first end of the crack detection line and detecting a current signal of the crack detection line;
the current signal is used to determine a crack detection result of the panel.
2. The panel crack detection circuit of claim 1, wherein an array substrate row drive trace is disposed in the non-display area;
the crack detection line is arranged between the edge line of the panel and the array substrate line driving routing, and the distance between the crack detection line and the edge line of the panel is larger than a preset cutting distance threshold value.
3. The panel crack detection circuit of claim 2, wherein the line width of the crack detection lines is less than a preset detection line width threshold.
4. The panel crack detection circuit according to any one of claims 1 to 3, further comprising a lighting monitoring module connected to the connector pin;
the lighting monitoring module is used for outputting the test voltage signal to a connector pin of the flexible circuit board during lighting detection, and generating a crack detection result of the panel according to a current signal of the crack detection line.
5. The panel crack detection circuit of claim 4, wherein the crack detection result of the panel is divided into a breakage detection result and a normal detection result;
the lighting monitoring module generates a crack detection result of the panel according to the current signal of the crack detection line, and the lighting monitoring module comprises: determining a current value of the current signal; if the current value of the current signal is smaller than the current threshold value corresponding to the test voltage signal, generating the damage detection result; and if the current value of the current signal is not less than the current threshold corresponding to the test voltage signal, generating a normal detection result.
6. The panel crack detection circuit of claim 5, wherein the current threshold is a current value determined according to a voltage value of the test voltage signal, an equivalent resistance value of the crack detection line, and a binding resistance value, and the binding resistance value is a flexible circuit board binding resistance value corresponding to the connector pin;
the test voltage signal is one path of output power supply signal of the lighting equipment, and the one path of power supply signal is a voltage signal required by abnormal lighting.
7. A display module comprising the panel crack detection circuit according to any one of claims 1 to 6.
8. A display device, comprising the display module according to claim 7.
9. A panel crack detection method, comprising:
providing a test voltage signal to a first end of the crack detection line; the crack detection line is positioned in a non-display area of the panel and partially surrounds a display area of the panel, a first end of the crack detection line is connected with a first end of the flexible circuit board, and a second end of the crack detection line is connected with a connector pin of the flexible circuit board;
detecting a current signal of the crack detection line through the connector pin;
and determining the crack detection result of the panel according to the current signal.
10. The panel crack detection method of claim 9, wherein the crack detection result is divided into a breakage detection result and a normal detection result, and the determining the crack detection result of the panel according to the current signal comprises:
determining a current value of the current signal;
if the current value of the current signal is smaller than the current threshold value corresponding to the test voltage signal, generating a damage detection result;
and if the current value of the current signal is not less than the current threshold corresponding to the test voltage signal, generating a normal detection result.
11. The panel crack detection method of claim 10, wherein the determining the crack detection result of the panel from the current signal further comprises:
obtaining an equivalent resistance value and a binding resistance value of the crack detection line, wherein the binding resistance value is a flexible circuit board binding resistance value corresponding to the connector pin;
and determining the current threshold according to the equivalent resistance value, the binding resistance value and the voltage value of the test voltage signal, wherein the test voltage signal is one path of output power signal of the lighting equipment, and the one path of power signal is a voltage signal required by abnormal lighting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111365961.9A CN113889013B (en) | 2021-11-17 | Panel crack detection circuit, method, display module and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111365961.9A CN113889013B (en) | 2021-11-17 | Panel crack detection circuit, method, display module and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113889013A true CN113889013A (en) | 2022-01-04 |
| CN113889013B CN113889013B (en) | 2024-05-17 |
Family
ID=
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080059946A (en) * | 2006-12-26 | 2008-07-01 | 엘지디스플레이 주식회사 | Apparatus and method of inspection substrate for flat display device |
| CN102192972A (en) * | 2010-02-26 | 2011-09-21 | 旭硝子株式会社 | Method and device for inspecting crack of rectangular plate object |
| US20120050249A1 (en) * | 2010-08-25 | 2012-03-01 | Dongwoon Anatech Co., Ltd. | Apparatus for driving of display panel |
| CN103382081A (en) * | 2012-05-04 | 2013-11-06 | 三星康宁精密素材株式会社 | Glass substrate laser cutting device with real-time breaking detecting function and glass substrate breakage detecting method thereof |
| US20140176844A1 (en) * | 2012-12-20 | 2014-06-26 | Japan Display Inc. | Display device |
| CN105372857A (en) * | 2015-12-16 | 2016-03-02 | 上海天马微电子有限公司 | Glass substrate, liquid crystal display panel and liquid crystal display device |
| CN105393165A (en) * | 2014-07-15 | 2016-03-09 | 华为技术有限公司 | Method for detecting substrate crack, substrate and detection circuit |
| CN205920741U (en) * | 2016-06-24 | 2017-02-01 | 上海与德科技有限公司 | Screen module and electronic equipment |
| US20170124929A1 (en) * | 2015-11-03 | 2017-05-04 | Medtronic Minimed, Inc. | Detecting breakage in a display element |
| CN108109930A (en) * | 2016-11-24 | 2018-06-01 | 迈来芯科技有限公司 | The monitoring system of die edge integrality |
| CN109342512A (en) * | 2018-11-29 | 2019-02-15 | 武汉华星光电技术有限公司 | The crack detecting method of display panel and display panel |
| CN209216557U (en) * | 2019-01-31 | 2019-08-06 | 昆山国显光电有限公司 | Display panel |
| CN110264926A (en) * | 2019-06-13 | 2019-09-20 | 武汉华星光电技术有限公司 | The detection circuit and its detection method of display panel |
| CN110838273A (en) * | 2019-11-21 | 2020-02-25 | 武汉天马微电子有限公司 | Crack detection method for display panel |
| CN111653225A (en) * | 2020-06-19 | 2020-09-11 | 上海天马有机发光显示技术有限公司 | Display module, crack detection method thereof and display device |
| CN113053288A (en) * | 2019-12-26 | 2021-06-29 | 乐金显示有限公司 | Display device |
| CN113284441A (en) * | 2021-05-18 | 2021-08-20 | 京东方科技集团股份有限公司 | Display module, fracture detection method and display device |
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080059946A (en) * | 2006-12-26 | 2008-07-01 | 엘지디스플레이 주식회사 | Apparatus and method of inspection substrate for flat display device |
| CN102192972A (en) * | 2010-02-26 | 2011-09-21 | 旭硝子株式会社 | Method and device for inspecting crack of rectangular plate object |
| US20120050249A1 (en) * | 2010-08-25 | 2012-03-01 | Dongwoon Anatech Co., Ltd. | Apparatus for driving of display panel |
| CN103382081A (en) * | 2012-05-04 | 2013-11-06 | 三星康宁精密素材株式会社 | Glass substrate laser cutting device with real-time breaking detecting function and glass substrate breakage detecting method thereof |
| US20140176844A1 (en) * | 2012-12-20 | 2014-06-26 | Japan Display Inc. | Display device |
| CN105393165A (en) * | 2014-07-15 | 2016-03-09 | 华为技术有限公司 | Method for detecting substrate crack, substrate and detection circuit |
| US20170124929A1 (en) * | 2015-11-03 | 2017-05-04 | Medtronic Minimed, Inc. | Detecting breakage in a display element |
| CN105372857A (en) * | 2015-12-16 | 2016-03-02 | 上海天马微电子有限公司 | Glass substrate, liquid crystal display panel and liquid crystal display device |
| CN205920741U (en) * | 2016-06-24 | 2017-02-01 | 上海与德科技有限公司 | Screen module and electronic equipment |
| CN108109930A (en) * | 2016-11-24 | 2018-06-01 | 迈来芯科技有限公司 | The monitoring system of die edge integrality |
| CN109342512A (en) * | 2018-11-29 | 2019-02-15 | 武汉华星光电技术有限公司 | The crack detecting method of display panel and display panel |
| CN209216557U (en) * | 2019-01-31 | 2019-08-06 | 昆山国显光电有限公司 | Display panel |
| CN110264926A (en) * | 2019-06-13 | 2019-09-20 | 武汉华星光电技术有限公司 | The detection circuit and its detection method of display panel |
| CN110838273A (en) * | 2019-11-21 | 2020-02-25 | 武汉天马微电子有限公司 | Crack detection method for display panel |
| CN113053288A (en) * | 2019-12-26 | 2021-06-29 | 乐金显示有限公司 | Display device |
| CN111653225A (en) * | 2020-06-19 | 2020-09-11 | 上海天马有机发光显示技术有限公司 | Display module, crack detection method thereof and display device |
| CN113284441A (en) * | 2021-05-18 | 2021-08-20 | 京东方科技集团股份有限公司 | Display module, fracture detection method and display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100392575B1 (en) | Liquid crystal display device and manufacturing method thereof | |
| US10670629B2 (en) | Display substrate, light-on device and method for testing alignment of light-on testing pin | |
| CN102819126B (en) | Testing device and testing method | |
| US20180197445A1 (en) | Device and method for detection of display panel | |
| US8508111B1 (en) | Display panel and method for inspecting thereof | |
| KR20070010567A (en) | Liquid crystal display panel, method for testing the same, and method for fabricating the same | |
| KR20140084632A (en) | Display device for deteting bonding defect | |
| KR20020050037A (en) | Liquid Crystal Display for Examination of Signal Line | |
| KR20190139354A (en) | Display device and method for testing the same | |
| JP2006292846A (en) | Liquid crystal panel and method for manufacturing the same | |
| US20070235888A1 (en) | Film type package and display apparatus having the same | |
| CN113889013B (en) | Panel crack detection circuit, method, display module and device | |
| CN109491166B (en) | Array substrate | |
| CN113889013A (en) | Panel crack detection circuit and method, display module and device | |
| KR20090051535A (en) | Liquid crystal display and testing method of thereof | |
| KR102078994B1 (en) | Liquid Crystal Display device and Inspection Method thereof | |
| US7518601B2 (en) | Array substrate and display apparatus and method for manufacturing display apparatus | |
| KR20110024260A (en) | Apparatus for detecting liquid crystal display panel and method for detecting the same | |
| CN109239999B (en) | Flexible circuit board, display panel and display device | |
| KR100471782B1 (en) | Defect Detection Method of LCD | |
| KR102016076B1 (en) | Testing apparatus and method for flat display device | |
| CN110930912A (en) | Detection method and detection circuit of liquid crystal display panel | |
| KR101192102B1 (en) | auto probe appratus and using the inspecting method for LCD panel using the same | |
| WO2020098081A1 (en) | Flexible circuit board, display panel, and display device | |
| KR20060075173A (en) | Test apparatus and test method for liquid crystal display device |
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 | ||
| GR01 | Patent grant |