CN114023228A - Detection method and detection circuit of display panel - Google Patents
Detection method and detection circuit of display panel Download PDFInfo
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- CN114023228A CN114023228A CN202111430844.6A CN202111430844A CN114023228A CN 114023228 A CN114023228 A CN 114023228A CN 202111430844 A CN202111430844 A CN 202111430844A CN 114023228 A CN114023228 A CN 114023228A
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- 238000001514 detection method Methods 0.000 title claims abstract description 129
- 239000000758 substrate Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 14
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- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 abstract description 6
- 238000013467 fragmentation Methods 0.000 abstract description 2
- 238000006062 fragmentation reaction Methods 0.000 abstract description 2
- 239000012634 fragment Substances 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 238000007689 inspection Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
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- 238000010168 coupling process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 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
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Abstract
The application provides a detection method and a detection circuit of a display panel, wherein the display panel comprises a substrate and a plurality of signal lines positioned on the substrate, and the detection method comprises the following steps: transmitting a signal from a start end of the signal line; receiving a signal from an end of the signal line; generating a signal detection waveform of the signal line from the received signal; judging whether the waveform of the detection signal is deformed or not; if the judgment result is yes, the display panel is judged to be open circuit or short circuit. This application adopts the signal detection wave form that electric current or voltage signal generated when transmitting in the signal line whether take place unusually and judge the signal line whether have the phenomenon of open circuit or short circuit to take place, and then judge the phenomenon of display panel whether have the fragmentation to take place through the phenomenon of open circuit or short circuit, overcomes among the prior art and utilizes the probe to survey display panel when dropping because of the foreign matter easily and arouse the condition of damage display panel when surveying on display panel.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a detection method and a detection circuit for a display panel.
Background
In the large-size TFT-LCD and TFT-OLED industries, after the gate and source/drain signal line process is completed, an Open and Short (Open & Short) detection site for an internal signal line is usually added, and the Open & Short of the gate line and the source/drain line is detected and repaired in time, thereby improving the yield of products.
However, the Open/Short test (OST) device is generally used for detecting the Open/Short of the signal line, and the probe head of the detector is close to the surface of the glass (100-200 um) in the test process. When tiny foreign matters fall on the surface of the glass, the glass is easy to scratch or break. Meanwhile, because the equipment needs to rotate the glass in the production process, the glass can be subjected to low-vacuum adsorption, and the glass adsorption cracks caused by tiny foreign matters are easy to occur.
When the chipping does not occur on the scanning path of the probe head of the detector, a large number of chipping anomalies may occur due to missing inspection. And the higher the risk of this anomaly occurring, as the panel size increases, limited by the setting of the scan path of the detector heads of the detector.
Therefore, the prior art has defects which need to be solved urgently.
Disclosure of Invention
The application provides a detection method and a detection circuit of a display panel, which can detect the problem that the panel is broken and is not easy to detect.
In order to solve the above problems, the technical solution provided by the present application is as follows:
a detection method of a display panel, the display panel comprises a substrate and a plurality of signal lines positioned on the substrate, the detection method comprises the following steps:
transmitting a signal from a start end of the signal line;
receiving a signal from an end of the signal line;
generating a signal detection waveform of the signal line from the received signal;
judging whether the waveform of the detection signal is deformed or not;
if the judgment result is yes, the display panel is judged to be open circuit or short circuit.
In some embodiments of the present invention, determining whether the waveform of the detection signal is distorted includes:
acquiring a first characteristic parameter of the signal detection waveform;
and comparing the first characteristic parameter with a first characteristic parameter of a preset waveform to judge whether the waveform of the detection signal is deformed.
In some embodiments of the present invention, the first characteristic parameter includes at least one of an amplitude of the signal detection waveform, a rising edge time of the signal detection waveform, a falling edge time of the signal detection waveform, a pulse width of the signal detection waveform, and a repetition period of the signal detection waveform.
In some embodiments of the present invention, the signal detection waveform includes a plurality of normal sub-signal waveforms, each of the sub-signal waveforms corresponds to one signal line, a start end of a sub-signal waveform corresponding to an nth signal line is connected to an end of a sub-signal waveform corresponding to an N-1 st signal line, and an end of a sub-signal waveform corresponding to an nth signal line is connected to a start end of a sub-signal waveform corresponding to an N +1 st signal line.
In some embodiments of the present invention, when it is determined that the display panel is short-circuited or short-circuited, the method further includes outputting a position of a signal line where the open or short-circuit occurs and giving an alarm, wherein the method of outputting the position of the signal line where the open or short-circuit currently occurs includes:
counting second characteristic parameters of sub-signal waveforms included in the current signal detection waveform; and
and obtaining the position of the signal wire which is currently broken or disconnected according to the corresponding relation between the second characteristic parameter and the signal wire.
In some embodiments of the present invention, the second characteristic parameter includes at least one of a number of normal the partial signal waveforms, a pulse width of the partial signal waveform, and a repetition period of the partial signal waveform.
The invention also relates to a detection circuit of the display panel.
A detection circuit of a display panel, comprising:
the receiving module is used for receiving the detection signal of the display panel;
the signal processing module is used for receiving the detection signal and generating a signal detection waveform; and
and the judging module is used for judging whether the signal detection waveform is deformed or not and outputting a judging result.
In some embodiments of the present invention, the determining module is further configured to obtain a first characteristic parameter of the signal detection waveform, and compare the first characteristic parameter with a first characteristic parameter of a preset waveform to determine whether the waveform of the detection signal is deformed.
In some embodiments of the present invention, the first characteristic parameter includes at least one of an amplitude of the signal detection waveform, a rising edge time of the detection signal, a falling edge time of the signal detection waveform, a pulse width of the signal detection waveform, and a repetition period of the signal detection waveform.
In some embodiments of the present invention, the detection circuit further includes a statistic module, and the statistic module is configured to count a second characteristic parameter included in the current signal detection waveform and transmit the second characteristic parameter to the signal processing module; the signal processing module further obtains the position of the signal line which is currently broken or disconnected according to the corresponding relation between the second characteristic parameter and the signal line, wherein the second characteristic parameter comprises at least one of the number of normal sub-signal waveforms, the pulse width of the sub-signal waveform and the repetition period of the sub-signal waveform.
The beneficial effect of this application does: the detection method and the detection circuit of the display panel provided by the application emit signals from the starting ends of the signal lines; receiving a signal from an end of the signal line; generating a signal detection waveform of the signal line from the received signal; judging whether the waveform of the detection signal is deformed or not; if the voltage is judged to be the short circuit or the open circuit, the display panel is judged to be in the open circuit or the short circuit, namely, the detection method and the detection circuit for the display panel provided by the application abandon the scanning of the display panel by a detection head of a detector in the prior art, and judge whether the signal line has the phenomenon of the open circuit or the short circuit by adopting whether a signal detection waveform generated when the current is transmitted in the signal line is abnormal or not, and further judge whether the display panel has the phenomenon of fragment or not by adopting the phenomenon of the open circuit or the short circuit.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic view illustrating an inspection process for inspecting a display panel by using an OST machine according to the present application;
FIG. 2 is a schematic diagram of waveforms outputted when an OST machine is used to inspect a display panel;
FIG. 3 is a schematic flow chart illustrating a first embodiment of a method for inspecting a display panel according to the present application;
fig. 4 is a schematic diagram of functional modules of a detection circuit of a display panel according to the present disclosure.
Description of the reference numerals
100-detection circuit of display panel;
101-a display panel; 1-a substrate; 2-a first signal line; 3-a second signal line; 8-fragmentation;
4-a signal transmitter; 5-a signal receiver; 6-signal detection waveform; 9-abnormal waveform;
7-minute signal waveform; 10-a receiving module; 20-a signal processing module;
30-a judging module; 40-a statistical module.
Detailed Description
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. It is to be understood that the embodiments described are only a few embodiments of the present application and 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 description of the present application, it is to be understood that the terms "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," and the like are used in the orientation or positional relationship indicated in the drawings, which are based on the orientation or positional relationship shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The present application may repeat reference numerals and/or letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. The following description is provided to describe the detection method and the detection circuit of the display panel in detail with reference to specific embodiments.
Referring to fig. 1-3, the present application provides a method for detecting a display panel, in which the display panel 101 includes a substrate 1 and a plurality of signal lines disposed on the substrate 1, the plurality of signal lines include a first signal line 2 and a second signal line 3 that are vertically crossed; the first signal line 2 is a gate signal line, and the second signal line 3 is a source or drain signal line. In the present application, the present invention is described by taking the first signal line 2 as an example, and it is understood that the detection method for the second signal line 3 is the same as the detection method for the first signal line 2. The detection method comprises the following steps:
s1: and providing an OST machine which comprises a signal transmitter 4 and a signal receiver 5, and transmitting a signal from the starting end of the first signal wire 2 by using the signal transmitter 4 of the OST machine.
S2: a signal receiver 5 included in the OST machine is used to receive signals from the end of the first signal line 2. The signal transmitter 4 and the first signal wire 2 of the OST can input signals to the first signal wire 2 in a probe contact mode or input signals to the first signal wire 2 in a capacitive coupling non-contact mode; the signal receiver 5 of the OST and the first signal line 2 can receive the input signal of the first signal line 2 in a probe contact mode or receive the input signal of the first signal line 2 in a capacitive coupling non-contact mode. The OST tool includes a signal transmitter 4 and a signal receiver 5 along the direction of the first signal line 2 when transmitting and receiving signals, but the scanning direction is perpendicular to the direction of the first signal line 2 when scanning, i.e. the OST tool scans all the first signal lines 2 continuously.
S3: generating a signal detection waveform 6 of the signal line from the received signal; that is, the signal transmitter 4 applies an ac voltage to one end of the substrate 1, transmits an ac signal through a plurality of signal lines of the substrate 1, detects a signal at the power receiving end, and generates a signal detection waveform 6 by amplifying the signal received at the power receiving end. In this application, the signal detection waveform 6 includes a plurality of normal sub-signal waveforms 7, each sub-signal waveform 7 corresponds to one signal line, that is, the start end of the sub-signal waveform 7 corresponding to the nth signal line is connected to the end of the sub-signal waveform 7 corresponding to the (N-1) th signal line, and the end of the sub-signal waveform 7 corresponding to the nth signal line is connected to the start end of the sub-signal waveform 7 corresponding to the (N + 1) th signal line.
S4: and judging whether the waveform of the detection signal is deformed or not. Judging whether the waveform of the detection signal is deformed or not comprises the following steps:
acquiring a first characteristic parameter of the signal detection waveform 6;
and comparing the first characteristic parameter with a first characteristic parameter of a preset waveform to judge whether the waveform of the detection signal is deformed.
In some embodiments of the present invention, the first characteristic parameter includes at least one of an amplitude of the signal detection waveform 6, a rising edge time of the signal detection waveform 6, a falling edge time of the signal detection waveform 6, a pulse width of the signal detection waveform 6, and a repetition period of the signal detection waveform 6. For example, if the peak value or the valley value of the signal detection waveform 6 changes suddenly and is outside the threshold range, it can be determined that the display panel is at the position where the fragment is generated; or the period changes suddenly, the risk of a fragment occurring may also be determined.
In order to confirm the position where the waveform is deformed, the front and rear sections of the abnormal waveform also need to be filtered and image analyzed to obtain an accurate judgment result.
S5: if yes, it is determined that the display panel 101 is open or short-circuited. Referring to fig. 1, when the scan signal of the OST scans the position of the display panel 101 where the fragment 8 occurs, the scanned waveform of the fragment 8 changes due to the fragment, so that whether the display panel 101 has the fragment can be determined according to the change of the waveform.
S6: when the display panel 101 is judged to be short-circuited or short-circuited, the method further comprises the steps of outputting the position of the signal line with the open circuit or the short circuit and giving an alarm, wherein the method for outputting the position of the signal line with the open circuit or the short circuit currently comprises the following steps:
counting second characteristic parameters of a sub-signal waveform 7 included in the current signal detection waveform; and
and obtaining the position of the signal wire which is currently broken or disconnected according to the corresponding relation between the second characteristic parameter and the signal wire.
For example, for a display panel 101 with a resolution of 1920 × 1080, there are 1920 first signal lines 2 and 1080 second signal lines 3, and the OST station can set the Gate1 as the scanning start position, the Gate1920 as the scanning end position, and the signal detection waveform 6 as the connection line of the sub-signal waveform 7 of each first signal line 2 being scanned during scanning, so that the detection circuit can timely output the positions of the display panel 101 where short circuit and open circuit occur according to the abnormal waveform 9, thereby improving the inspection efficiency.
In the present embodiment, the second characteristic parameter includes at least one of the number of normal component signal waveforms 7, the pulse width of the component signal waveform 7, the number of peaks of the normal component signal waveform 7, the number of valleys of the normal component signal waveform 7, and the repetition period of the component signal waveform 7. That is to say, each time a first signal line 2 is scanned, a sub-signal waveform 7 corresponding to the first signal line is generated, during scanning, second characteristic parameters representing the sub-signal waveforms 7 are counted in real time, and according to the ranking to which the first signal line 2 corresponding to the abnormal waveform belongs, obtained through analysis and processing of the second characteristic parameters, the position of the signal line corresponding to the abnormal waveform 9 is obtained.
Referring to fig. 4, the present invention further relates to a detection circuit 100 of a display panel. The detection circuit 100 of the display panel comprises: the device comprises a receiving module 10, a signal processing module 20, a judging module 30 and a counting module 40.
The receiving module 10 is configured to receive a detection signal of the display panel 101.
The signal processing module 20 is configured to receive the detection signal and generate a signal detection waveform 6; and
the judging module 30 is configured to judge whether the signal detection waveform 6 is deformed, and output a judgment result; the determining module 30 is further configured to obtain a first characteristic parameter of the signal detection waveform 6, and compare the first characteristic parameter with a first characteristic parameter of a preset waveform to determine whether the waveform of the detection signal is deformed. The first characteristic parameter includes at least one of an amplitude of the signal detection waveform 6, a rising edge time of the detection signal, a falling edge time of the signal detection waveform 6, a pulse width of the signal detection waveform 6, and a repetition period of the signal detection waveform 6.
The statistical module 40 is configured to count the second characteristic parameter currently characterizing the signal detection waveform 6 and transmit the second characteristic parameter to the signal processing module 20.
The signal processing module 20 further obtains the position of the signal line currently having an open circuit or an open circuit according to the corresponding relationship between the second characteristic parameter and the signal line, wherein the characteristic second characteristic parameter includes at least one of the number of scanned signal lines, the number of normal sub-signal waveforms 7, the number of peaks and the number of valleys of the sub-signal waveforms 7, the repetition period of the sub-signal waveforms 7, and the displacement of the signal detection waveform in the coordinate system.
It is understood that in other embodiments, the apparatus further includes a filtering module, and the filtering module is configured to intercept a part of the front end and a part of the back end of the abnormal waveform 9, and send the intercepted part of the front end and the part of the back end to the signal processing module 20 for accurate analysis.
In summary, in the technical solution provided by the present invention, a signal is transmitted from the beginning of the signal line on the surface of the substrate 1; receiving a signal from an end of the signal line; generating a signal detection waveform 6 of the signal line from the received signal; judging whether the waveform of the detection signal is deformed or not; if the detection result is yes, the display panel 101 is judged to be open or short-circuited, and the position where the short circuit or open circuit occurs is given, so that a worker can conveniently and timely overhaul the position where the short circuit or open circuit occurs according to the scanning result, and the detection efficiency of the display panel 101 is improved. Therefore, the problem that the display panel 101 is damaged due to the fact that foreign matters falling on the display panel 101 are easily contacted when the probe of the OST machine platform is used for scanning and detecting the display panel 101 in the prior art can be solved.
In summary, although the present application has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application shall be determined by the appended claims.
Claims (10)
1. A detection method of a display panel, the display panel comprises a substrate and a plurality of signal lines positioned on the substrate, and the detection method comprises the following steps:
transmitting a signal from a start end of the signal line;
receiving a signal from an end of the signal line;
generating a signal detection waveform of the signal line from the received signal;
judging whether the waveform of the detection signal is deformed or not;
if the judgment result is yes, the display panel is judged to be open circuit or short circuit.
2. The detection method according to claim 1, wherein determining whether the waveform of the detection signal is distorted comprises:
acquiring a first characteristic parameter of the signal detection waveform;
and comparing the first characteristic parameter with a first characteristic parameter of a preset waveform to judge whether the waveform of the detection signal is deformed.
3. The method according to claim 2, wherein the first characteristic parameter includes at least one of an amplitude of the signal detection waveform, a rising edge time of the signal detection waveform, a falling edge time of the signal detection waveform, a pulse width of the signal detection waveform, and a repetition period of the signal detection waveform.
4. The method according to claim 1, wherein the signal detection waveform comprises a plurality of normal sub-signal waveforms, each of the sub-signal waveforms corresponds to one signal line, a start end of a sub-signal waveform corresponding to an nth signal line is connected to an end of a sub-signal waveform corresponding to an N-1 th signal line, and an end of a sub-signal waveform corresponding to an nth signal line is connected to a start end of a sub-signal waveform corresponding to an N +1 th signal line.
5. The method for detecting the display panel according to claim 4, further comprising outputting a position of a signal line where the disconnection or short circuit occurs and giving an alarm when it is judged that the display panel is short-circuited or short-circuited, wherein the method for outputting the position of the signal line where the disconnection or short circuit currently occurs comprises:
counting second characteristic parameters of sub-signal waveforms included in the current signal detection waveform; and
and obtaining the position of the signal wire which is currently broken or disconnected according to the corresponding relation between the second characteristic parameter and the signal wire.
6. The method according to claim 5, wherein the second characteristic parameter includes at least one of a number of currently scanned signal lines, a number of the partial signal waveforms, a number of peaks, a number of valleys of the partial signal waveforms, a repetition period of the partial signal waveforms, and a displacement of a signal detection waveform in a coordinate system.
7. A detection circuit for a display panel, comprising:
the receiving module is used for receiving the detection signal of the display panel;
the signal processing module is used for receiving the detection signal and generating a signal detection waveform; and
and the judging module is used for judging whether the signal detection waveform is deformed or not and outputting a judging result.
8. The detection circuit of claim 7, wherein the determination module is further configured to obtain a first characteristic parameter of the signal detection waveform, and compare the first characteristic parameter with a first characteristic parameter of a preset waveform to determine whether the waveform of the detection signal is distorted.
9. The detection circuit of the display panel according to claim 7, wherein the first characteristic parameter includes at least one of an amplitude of the signal detection waveform, a rising edge time of the detection signal, a falling edge time of the signal detection waveform, a pulse width of the signal detection waveform, and a repetition period of the signal detection waveform.
10. The detection circuit of the display panel according to claim 7, wherein the detection circuit further comprises a statistic module, and the statistic module is configured to count a second characteristic parameter included in the current signal detection waveform and transmit the second characteristic parameter to the signal processing module; the signal processing module further obtains and outputs the position of the signal line which is currently broken or disconnected according to the corresponding relation between the second characteristic parameter and the signal line, wherein the second characteristic parameter includes at least one of the number of scanned signal lines, the number of the sub-signal waveforms, the number of peaks and valleys of the sub-signal waveforms, the repetition period of the sub-signal waveforms and the displacement of the signal detection waveform in the coordinate system.
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| CN202111430844.6A CN114023228A (en) | 2021-11-29 | 2021-11-29 | Detection method and detection circuit of display panel |
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| CN202111430844.6A CN114023228A (en) | 2021-11-29 | 2021-11-29 | Detection method and detection circuit of display panel |
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| CN103137049A (en) * | 2011-11-25 | 2013-06-05 | 乐金显示有限公司 | Display panel for display device and method for detecting defects of signal lines for display devices |
| CN104965321A (en) * | 2015-07-01 | 2015-10-07 | 深圳市华星光电技术有限公司 | Display panel detecting system and detecting method |
| CN107064661A (en) * | 2016-06-27 | 2017-08-18 | 友达光电股份有限公司 | Panel structure with detection circuit and panel detection circuit |
| CN109817135A (en) * | 2019-03-29 | 2019-05-28 | 云谷（固安）科技有限公司 | Array substrate and test, forming method, device and display panel forming method |
| CN110930912A (en) * | 2019-12-10 | 2020-03-27 | 深圳市华星光电半导体显示技术有限公司 | Detection method and detection circuit of liquid crystal display panel |
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2021
- 2021-11-29 CN CN202111430844.6A patent/CN114023228A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103137049A (en) * | 2011-11-25 | 2013-06-05 | 乐金显示有限公司 | Display panel for display device and method for detecting defects of signal lines for display devices |
| CN104965321A (en) * | 2015-07-01 | 2015-10-07 | 深圳市华星光电技术有限公司 | Display panel detecting system and detecting method |
| CN107064661A (en) * | 2016-06-27 | 2017-08-18 | 友达光电股份有限公司 | Panel structure with detection circuit and panel detection circuit |
| CN109817135A (en) * | 2019-03-29 | 2019-05-28 | 云谷（固安）科技有限公司 | Array substrate and test, forming method, device and display panel forming method |
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