CN107680522B - Display panel detection method and device - Google Patents
Display panel detection method and device Download PDFInfo
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- CN107680522B CN107680522B CN201710929743.0A CN201710929743A CN107680522B CN 107680522 B CN107680522 B CN 107680522B CN 201710929743 A CN201710929743 A CN 201710929743A CN 107680522 B CN107680522 B CN 107680522B
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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Abstract
The embodiment of the invention provides a display panel detection method and a device thereof, wherein the display panel detection method comprises the following steps: inputting a test signal to an input terminal of each pixel driving circuit on the display panel; collecting the voltage output by the output end of each pixel driving circuit; according to the technical scheme, the image for detecting the Mura phenomenon of the display panel is formed by inputting the test signal to each pixel driving circuit and forming the image according to the voltage output by the output end of each pixel driving circuit, so that whether the Mura phenomenon exists in the display panel without the OLED device manufacturing can be detected, the display panel with uneven threshold voltage drift is eliminated, and the manufacturing cost is saved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel detection method and a display panel detection device.
Background
An Active Matrix/Organic Light Emitting Diode (AMOLED) display is one of the hot spots in the research field of displays. Compared with a Liquid Crystal Display (LCD for short), the OLED Display has the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, and the like.
Currently, the AMOLED display panel can be manufactured by using an Oxide (Oxide) Thin Film Transistor (TFT) process technology. Generally, in an AMOLED display panel manufactured by using an oxide thin film transistor process technology, a type of a thin film transistor in a pixel driving circuit may be a P-type or an N-type, but no matter the P-type or the N-type thin film transistor is selected to realize the pixel driving circuit, a current of an organic light emitting diode changes along with a threshold voltage shift of the driving transistor, so that the AMOLED display panel generates a Mura phenomenon of non-uniform display brightness, and further the brightness uniformity and the brightness constancy of the AMOLED display panel are affected.
The inventor researches and discovers that in the prior art, whether the Mura phenomenon exists in the display panel can be detected only by manually observing the light emitting condition of the OLED on the display panel, and if the threshold voltage of the display panel which is not manufactured by the OLED device is uneven, the display panel on which the OLED device is manufactured cannot be used, so that the waste of manufacturing cost is caused.
Disclosure of Invention
In order to solve the above technical problem, embodiments of the present invention provide a display panel detection method and apparatus, which can detect whether a Mura phenomenon exists in a display panel that is not manufactured by an OLED device, and eliminate a display panel with non-uniform threshold voltage drift, thereby saving manufacturing cost.
In order to achieve the object of the present invention, an embodiment of the present invention provides a display panel detection method, including:
inputting a test signal to an input terminal of each pixel driving circuit on the display panel;
collecting the voltage output by the output end of each pixel driving circuit;
and forming an image for detecting the Mura phenomenon of the display panel according to the voltage output by the output end of each pixel driving circuit.
Optionally, the input terminal of each pixel driving circuit comprises: the device comprises a data signal end, a scanning signal end and a variable voltage end;
the inputting of the test signal to the input terminal of each pixel driving circuit on the display panel includes:
in the first stage, inputting high-level signals to the data signal end and the scanning signal end, and inputting a first signal to the variable voltage end;
in the second stage, high level signals are input to the data signal terminal and the scan signal terminal, and a second signal is input to the variable voltage terminal.
Optionally, the voltage of the first signal is less than the voltage of the second signal.
Optionally, the voltage output by the output terminal of each pixel driving circuit is a difference between a voltage of an input signal of the data signal terminal in each pixel driving circuit and a threshold voltage of the driving transistor.
Optionally, the forming an image for detecting a Mura phenomenon of the display panel according to the voltage output from the output terminal of each pixel driving circuit includes:
converting the voltage output by the output end of each pixel driving circuit into a corresponding brightness signal;
and displaying the brightness signal corresponding to each pixel driving circuit at the same pixel position of the display panel of each pixel driving circuit to form an image for detecting the Mura phenomenon of the display panel.
Optionally, the method further comprises:
calculating a brightness mean value according to the corresponding brightness signals of all the pixel driving circuits;
and judging whether the difference between the brightness signal corresponding to each pixel driving circuit and the brightness mean value is smaller than a preset error or not, and displaying abnormal pixel brightness corresponding to the pixel driving circuit under the condition that the difference between the brightness signal corresponding to the pixel driving circuit and the brightness mean value is larger than the preset error.
In another aspect, an embodiment of the present invention further provides a display panel detection apparatus, including: the device comprises a test module, an acquisition module and a processing module;
the test module is connected with the input end of each pixel driving circuit on the display panel and is configured to input a test signal to the input end of each pixel driving circuit on the display panel;
the acquisition module is connected with the output end of each pixel driving circuit and is configured to acquire the voltage output by the output end of each pixel driving circuit;
the processing module is configured to form an image for detecting a Mura phenomenon of the display panel according to an output voltage of each pixel driving circuit.
Optionally, the input terminal of each pixel driving circuit comprises: the device comprises a data signal end, a scanning signal end and a variable voltage end;
the test module is configured to:
in the first stage, inputting high-level signals to the data signal end and the scanning signal end, and inputting a first signal to the variable voltage end;
in the second stage, high level signals are input to the data signal terminal and the scan signal terminal, and a second signal is input to the variable voltage terminal.
Optionally, the processing module includes: a conversion unit and a display unit;
the conversion unit is configured to convert the voltage output by the output end of each pixel driving circuit into a corresponding brightness signal;
the display unit is configured to display the brightness signal corresponding to each pixel driving circuit at the same pixel position of the display panel of each pixel driving circuit, and form an image for detecting a Mura phenomenon of the display panel.
Optionally, the processing module further comprises: a calculation unit and a judgment unit;
the calculation unit is configured to calculate a luminance average value according to the corresponding luminance signals of all the pixel driving circuits;
the judging unit is configured to judge whether the difference between the brightness signal corresponding to each pixel driving circuit and the brightness mean value is smaller than a preset error, and the brightness of the pixel corresponding to the pixel driving circuit is displayed abnormally under the condition that the difference between the brightness signal corresponding to the pixel driving circuit and the brightness mean value is larger than the preset error.
The embodiment of the invention provides a display panel detection method and a device thereof, wherein the display panel detection method comprises the following steps: inputting a test signal to an input terminal of each pixel driving circuit on the display panel; collecting the voltage output by the output end of each pixel driving circuit; according to the technical scheme, the image for detecting the Mura phenomenon of the display panel is formed by inputting the test signal to each pixel driving circuit and forming the image according to the voltage output by the output end of each pixel driving circuit, so that the Mura phenomenon of the display panel is detected, the waste of manufacturing cost caused by the fact that the Mura phenomenon can only be found by observing the OLED on the display panel in the prior art is avoided, whether the Mura phenomenon exists in the display panel without the OLED device can be detected, the display panel with uneven threshold voltage drift is eliminated, and the manufacturing cost is saved.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flowchart illustrating a method for inspecting a display panel according to an embodiment of the present invention;
fig. 2 is an equivalent circuit diagram of a pixel driving circuit according to an embodiment of the invention;
FIG. 3 is a timing diagram illustrating a test of a pixel driving circuit according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a display panel inspection apparatus according to an embodiment of the present invention;
fig. 5 is another schematic structural diagram of a display panel detection apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
It will be understood by those skilled in the art that the switching transistors and the driving transistors employed in all embodiments of the present application may be thin film transistors or field effect transistors or other devices having the same characteristics. Preferably, the thin film transistor used in the embodiment of the present invention may be an oxide semiconductor transistor. Since the source and drain of the switching transistor used here are symmetrical, the source and drain can be interchanged. In the embodiment of the present invention, in order to distinguish two electrodes of a transistor except for a gate, one of the electrodes is referred to as a first electrode, the other electrode is referred to as a second electrode, the first electrode may be a source or a drain, and the second electrode may be a drain or a source.
Unless defined otherwise, technical or scientific terms used in the disclosure of the embodiments of the present invention should have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar language in the embodiments of the present invention does not denote any order, quantity, or importance, but rather the terms "first," "second," and similar language are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that a particular element or item appears in front of the word or is detected by mistake, and that the word or item appears after the word or item and its equivalents, but does not exclude other elements or misdetections. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In order to solve the technical problem that the Mura phenomenon can be found only after the OLED is installed on the AMOLED display panel with threshold voltage deviation in the prior art, but the display panel cannot be used at the moment, so that the manufacturing cost is wasted, the embodiment of the invention provides a display panel detection method and a device thereof.
Example one
Fig. 1 is a flowchart of a display panel detection method according to an embodiment of the present invention, and as shown in fig. 1, the display panel detection method according to the embodiment of the present invention specifically includes the following steps:
Specifically, the test signal input to the input terminal of the pixel driving circuit needs to ensure that the voltage output by the pixel driving circuit is related to the threshold voltage of the driving transistor in the pixel driving circuit.
And 200, collecting the voltage output by the output end of each pixel driving circuit.
It should be noted that, the threshold voltage of the driving transistor in each pixel driving circuit may drift after a certain period of time, and therefore, the output voltage of the output terminal of each pixel driving circuit may not be the same.
And step 300, forming an image for detecting the Mura phenomenon of the display panel according to the voltage output by the output end of each pixel driving circuit.
In this embodiment, after an image for detecting the Mura phenomenon of the display panel is formed, a photo may be taken by a camera, and a human eye observes whether the brightness of each pixel on the photo is uniform, or the image is processed by a processor to sequentially determine whether the Mura phenomenon exists on the display panel, and if the problem is serious, the display panel is excluded, which is not limited in this invention.
The standard for observing the brightness change of an image by human eyes or processing the image by one processor is that the display panel does not have the Mura phenomenon as long as the brightness of the formed image is uniform, that is, if the threshold voltages of the driving transistors in the pixel driving circuits on the display panel are all shifted but the shift degrees are approximately the same, and the brightness of the image is totally bright or totally dark, the display panel does not have the Mura phenomenon.
The display panel detection method provided by the embodiment of the invention comprises the following steps: inputting a test signal to an input terminal of each pixel driving circuit on the display panel; collecting the voltage output by the output end of each pixel driving circuit; according to the technical scheme, the image for detecting the Mura phenomenon of the display panel is formed by inputting the test signal to each pixel driving circuit and forming the image according to the voltage output by the output end of each pixel driving circuit, so that the Mura phenomenon of the display panel is detected, the waste of manufacturing cost caused by the fact that the Mura phenomenon can only be found by observing the OLED on the display panel in the prior art is avoided, whether the Mura phenomenon exists in the display panel without the OLED device can be detected, the display panel with uneven threshold voltage drift is eliminated, and the manufacturing cost is saved.
Optionally, fig. 2 is an equivalent circuit diagram of a pixel driving circuit according to an embodiment of the present invention, and as shown in fig. 2, an input terminal of the pixel driving circuit includes: a Data signal terminal Data, a Scan signal terminal Scan, and a variable voltage terminal VDD.
Optionally, step 100 comprises:
in the first stage, high-level signals are input to a Data signal terminal Data and a scanning signal terminal Scan, and a first signal is input to a variable voltage terminal VDD; in the second stage, a high level signal is input to the Data signal terminal Data and the Scan signal terminal Scan, and a second signal is input to the variable voltage terminal VDD.
It should be noted that the voltages of the high-level signals input to the Data signal terminals Data in the first stage and the second stage may be the same or different, and the voltages of the high-level signals input to the Scan signal terminals Scan in the first stage and the second stage may be the same or different, which is not limited in this respect.
Alternatively, the voltage of the first signal is less than 0V, may be-5V, etc., and the voltage of the second signal is greater than the voltage of the first signal.
In addition, as shown in fig. 2, the pixel driving circuit further includes: a switching transistor T, a driving transistor DTFT, and a capacitor C.
Specifically, the switching transistor T is connected to the Data signal terminal Data, the Scan signal terminal Scan, and the first node N1, and is configured to provide a signal of the Data signal terminal Data to the first node N1 under the control of the Scan signal terminal Scan.
Specifically, the gate of the switching transistor T is connected to the Scan signal terminal Scan, the first pole is connected to the Data signal terminal Data, and the second pole is connected to the first node N1.
And a driving transistor DTFT connected to the variable voltage terminal VDD, the first node N1 and the second node N2, for pulling up a voltage of the second node N2 to a difference between a voltage Vref of an input signal of the Data signal terminal Data and a threshold voltage Vth of the driving transistor DTFT under the control of the first node N1 and the variable voltage terminal VDD.
Specifically, the gate of the driving transistor DTFT is connected to the first node N1, the first pole is connected to the variable voltage terminal VDD, and the second pole is connected to the second node N2.
And a capacitor C connected to the first node N1 and the second node N2 for storing a voltage between the first node N1 and the second node N2.
Specifically, one end of the capacitor C is connected to the first node N1, and the other end is connected to the second node N2.
It should be noted that the second node N2 in the pixel driving circuit is an output end of the pixel driving circuit, and the voltage of the second node N2 is a difference between the voltage of the input signal of the Data signal end Data and the threshold voltage Vth of the driving transistor, so that the voltage of the second node can represent the threshold voltage of the driving transistor DTFT.
The technical solution of the embodiment of the present invention is further described below with reference to the working process of the pixel driving circuit.
FIG. 3 is a timing diagram illustrating a test of a pixel driving circuit according to an embodiment of the present invention; as shown in fig. 2 and 3, a pixel driving circuit according to an embodiment of the present invention includes: 1 switching transistor (T), 1 driving transistor (DTFT), 1 electric capacity unit (C), 3 input ends (Data, VDD and Scan), its working process includes:
in the first stage S1, the input signal of the Scan signal terminal Scan is at a high level, the input signal of the Data signal terminal Data is at a high level Vref, and the input signal of the variable voltage terminal VDD is the first signal.
Since the input signal of the Scan signal terminal Scan is at a high level, the switching transistor T is turned on, the difference between the voltage Vref of the input signal provided by the Data signal terminal Data and the second node N2 is greater than the threshold voltage Vth of the driving transistor DTFT, at this time, the voltage of the first node N1 is Vref, the driving transistor DTFT is turned on, and since the input signal of the variable voltage terminal VDD is at this time a first signal, which is at a low level, at this time, the voltage of the second node N2 is pulled down to the voltage of the first signal.
In the second stage S2, the input signal of the Scan signal terminal Scan continues to be at the high level, the input signal of the Data signal terminal Data continues to be at the high level Vref, and the input signal of the variable voltage terminal VDD jumps into the second signal.
Since the input signal of the Scan signal terminal Scan is continuously at the high level, the switching transistor T is still turned on, the difference between the voltage Vref of the input signal provided by the Data signal terminal Data and the second node N2 is greater than the threshold voltage Vth of the driving transistor DTFT, at this time, the voltage of the first node N1 is Vref, the driving transistor DTFT is turned on, the input signal of the variable voltage terminal VDD jumps to the second signal and becomes the high level, at this time, the variable voltage terminal VDD is pulled up to the voltage of the second node N2 until the voltage of the second node N2 is equal to Vref-Vth, at this time, the driving transistor DTFT is turned off, so that the voltage stored at the two ends of the capacitor C is the threshold voltage Vth of the driving transistor DTFT.
Since the voltage output by the output terminal of the pixel driving circuit is the voltage of the second node N2, and the voltage of the second node N2 is Vref-Vth at this time, the voltage output by the pixel driving circuit can represent the threshold voltage of the driving transistor DTFT.
Optionally, step 200 comprises: converting the voltage output by the output end of each pixel driving circuit into a corresponding brightness signal; and displaying the brightness signal corresponding to each pixel driving circuit at the same pixel position of the display panel of each pixel driving circuit to form an image for detecting the Mura phenomenon of the display panel.
In the present embodiment, the device for displaying the luminance signal corresponding to each pixel driving circuit needs to have substantially the same structure as the display panel, that is, the number of pixels and the positions of the pixels.
Optionally, the display panel detection method provided in the embodiment of the present invention further includes: calculating a brightness mean value according to the corresponding brightness signals of all the pixel driving circuits; and judging whether the difference between the brightness signal corresponding to each pixel driving circuit and the brightness mean value is smaller than a preset error or not, and displaying abnormal pixel brightness corresponding to the pixel driving circuit under the condition that the difference between the brightness signal corresponding to the pixel driving circuit and the brightness mean value is larger than the preset error.
Example two
Based on the inventive concept of the foregoing embodiment, fig. 4 is a schematic structural diagram of a display panel detection apparatus according to an embodiment of the present invention, and as shown in fig. 4, the display panel detection apparatus according to the embodiment of the present invention, which applies the display panel detection method according to the first embodiment of the present invention, specifically includes: a test module 10, an acquisition module 20 and a processing module 30.
The test module 10 is connected to an input terminal of each pixel driving circuit on the display panel, and configured to input a test signal to the input terminal of each pixel driving circuit on the display panel.
Specifically, the test signal input to the input terminal of the pixel driving circuit needs to ensure that the voltage output by the pixel driving circuit is related to the threshold voltage of the driving transistor in the pixel driving circuit.
And the acquisition module 20 is connected with the output end of each pixel driving circuit and is configured to acquire the voltage output by the output end of each pixel driving circuit.
It should be noted that, the threshold voltage of the driving transistor in each pixel driving circuit may drift after a certain period of time, and therefore, the output voltage of the output terminal of each pixel driving circuit may not be the same.
And a processing module 30 configured to form an image for detecting a Mura phenomenon of the display panel according to an output voltage of each pixel driving circuit.
In this embodiment, after an image for detecting the Mura phenomenon of the display panel is formed, a photo may be taken by a camera, and the brightness change of each pixel on the photo is observed by human eyes, or a processor processes the image to determine whether the Mura phenomenon exists on the display panel, and if the problem is serious, the display panel is excluded, which is not limited in the present invention.
The display panel detection device provided by the embodiment of the invention comprises: the technical scheme of the invention includes that the test module is connected with the input end of each pixel driving circuit on the display panel and is configured to input a test signal to the input end of each pixel driving circuit on the display panel, the acquisition module is connected with the output end of each pixel driving circuit and is configured to acquire the voltage output by the output end of each pixel driving circuit, and the processing module is configured to form an image for detecting the Mura phenomenon of the display panel according to the output voltage of each pixel driving circuit. Whether the Mura phenomenon exists in the display panel which is not manufactured by the OLED device can be detected, the display panel with uneven threshold voltage drift is eliminated, and manufacturing cost is saved.
Optionally, the input terminal of the pixel driving circuit comprises: the circuit comprises a data signal end, a scanning signal end and a variable voltage end.
The test module 10 is configured to: in the first stage, high level signals are input to a data signal end and a scanning signal end, and a first signal is input to a variable voltage end; in the second stage, high level signals are input to the data signal terminal and the scanning signal terminal, and a second signal is input to the variable voltage terminal.
Optionally, fig. 5 is another schematic structural diagram of the display panel detection apparatus according to the embodiment of the present invention, and as shown in fig. 5, the processing module 30 includes: a conversion unit 31 and a display unit 32.
A conversion unit 31 configured to convert the voltage output from the output terminal of each pixel driving circuit into a corresponding luminance signal.
And a display unit 32 configured to display the luminance signal corresponding to each pixel driving circuit at the same pixel position of the display panel at each pixel driving circuit, and form an image for detecting a Mura phenomenon of the display panel.
Optionally, the processing module further comprises: a calculating unit and a judging unit.
A calculation unit configured to calculate a luminance average value from the corresponding luminance signals of all the pixel drive circuits;
and the judging unit is configured to judge whether the difference between the brightness signal corresponding to each pixel driving circuit and the brightness mean value is smaller than a preset error, and the brightness of the pixel corresponding to the pixel driving circuit is displayed abnormally under the condition that the difference between the brightness signal corresponding to the pixel driving circuit and the brightness mean value is larger than the preset error.
The following points need to be explained:
the drawings of the embodiments of the invention only relate to the structures related to the embodiments of the invention, and other structures can refer to common designs.
Without conflict, features of embodiments of the present invention, that is, embodiments, may be combined with each other to arrive at new embodiments.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A display panel detection method is characterized by comprising the following steps:
inputting a test signal to an input terminal of each pixel driving circuit on the display panel;
collecting the voltage output by the output end of each pixel driving circuit;
converting the voltage output by the output end of each pixel driving circuit into a corresponding brightness signal;
displaying the brightness signal corresponding to each pixel driving circuit at the same pixel position of each pixel driving circuit on the display panel by using the display unit to form an image for detecting a Mura phenomenon of the display panel;
calculating a brightness mean value according to the corresponding brightness signals of all the pixel driving circuits;
and judging whether the difference between the brightness signal corresponding to each pixel driving circuit and the brightness mean value is smaller than a preset error or not, and displaying abnormal pixel brightness corresponding to the pixel driving circuit under the condition that the difference between the brightness signal corresponding to the pixel driving circuit and the brightness mean value is larger than the preset error.
2. The method of claim 1, wherein the input of each pixel driving circuit comprises: the device comprises a data signal end, a scanning signal end and a variable voltage end;
the inputting of the test signal to the input terminal of each pixel driving circuit on the display panel includes:
in the first stage, inputting high-level signals to the data signal end and the scanning signal end, and inputting a first signal to the variable voltage end;
in the second stage, high level signals are input to the data signal terminal and the scan signal terminal, and a second signal is input to the variable voltage terminal.
3. The method of claim 2, wherein the voltage of the first signal is less than the voltage of the second signal.
4. The method according to claim 1, wherein the voltage output from the output terminal of each pixel driving circuit is a difference between the voltage of the input signal at the data signal terminal of each pixel driving circuit and the threshold voltage of the driving transistor.
5. A display panel inspection apparatus, comprising: the device comprises a test module, an acquisition module and a processing module;
the test module is connected with the input end of each pixel driving circuit on the display panel and is configured to input a test signal to the input end of each pixel driving circuit on the display panel;
the acquisition module is connected with the output end of each pixel driving circuit and is configured to acquire the voltage output by the output end of each pixel driving circuit;
the processing module comprises: a conversion unit and a display unit;
the conversion unit is configured to convert the voltage output by the output end of each pixel driving circuit into a corresponding brightness signal;
the display unit is configured to display the brightness signal corresponding to each pixel driving circuit at the same pixel position of the display panel of each pixel driving circuit, and form an image for detecting a Mura phenomenon of the display panel;
the processing module further comprises: a calculation unit and a judgment unit;
the calculation unit is configured to calculate a luminance average value according to the corresponding luminance signals of all the pixel driving circuits;
the judging unit is configured to judge whether the difference between the brightness signal corresponding to each pixel driving circuit and the brightness mean value is smaller than a preset error, and the brightness of the pixel corresponding to the pixel driving circuit is displayed abnormally under the condition that the difference between the brightness signal corresponding to the pixel driving circuit and the brightness mean value is larger than the preset error.
6. The device of claim 5, wherein the input of each pixel driving circuit comprises: the device comprises a data signal end, a scanning signal end and a variable voltage end;
the test module is configured to:
in the first stage, inputting high-level signals to the data signal end and the scanning signal end, and inputting a first signal to the variable voltage end;
in the second stage, high level signals are input to the data signal terminal and the scan signal terminal, and a second signal is input to the variable voltage terminal.
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| CN108847170B (en) * | 2018-05-29 | 2021-06-25 | 信利（惠州）智能显示有限公司 | Display screen product detection method and detection device |
| CN109817135B (en) * | 2019-03-29 | 2021-03-30 | 云谷（固安）科技有限公司 | Array substrate, testing and forming method and device and display panel forming method |
| CN111179793B (en) * | 2020-01-06 | 2022-03-25 | 京东方科技集团股份有限公司 | Detection method and device for display substrate |
| CN111261055B (en) * | 2020-01-21 | 2022-02-22 | 京东方科技集团股份有限公司 | OLED display screen and OLED display device |
| CN114035020A (en) * | 2021-09-29 | 2022-02-11 | 重庆康佳光电技术研究院有限公司 | Back board circuit detection device and method |
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| CN100405068C (en) * | 2006-01-13 | 2008-07-23 | 友达光电股份有限公司 | Apparatus and method for testing organic electroluminescence display panel |
| KR20140014694A (en) * | 2012-07-25 | 2014-02-06 | 삼성디스플레이 주식회사 | Apparatus and method for compensating of image in display device |
| KR102122517B1 (en) * | 2012-12-17 | 2020-06-12 | 엘지디스플레이 주식회사 | Organic Light Emitting Display |
| KR102089051B1 (en) * | 2013-11-25 | 2020-03-16 | 삼성디스플레이 주식회사 | Pixel circuit for increasing validity of current sensing |
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| CN105047131B (en) * | 2015-07-29 | 2018-07-13 | 深圳丹邦投资集团有限公司 | A kind of control method of AMOLED pixel circuit |
| CN105609024B (en) * | 2016-01-05 | 2018-07-27 | 京东方科技集团股份有限公司 | The test method and device of display panel |
| CN105845062A (en) * | 2016-03-31 | 2016-08-10 | 京东方科技集团股份有限公司 | Method and system of detecting display panels, and batch detection method of display panels |
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