CN115050294A - Display panel detection method and device and display panel - Google Patents
Display panel detection method and device and display panel Download PDFInfo
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- CN115050294A CN115050294A CN202210660213.1A CN202210660213A CN115050294A CN 115050294 A CN115050294 A CN 115050294A CN 202210660213 A CN202210660213 A CN 202210660213A CN 115050294 A CN115050294 A CN 115050294A
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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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- 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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The application provides a detection method and a detection device of a display panel and the display panel, and relates to the technical field of display. The method comprises the steps of obtaining a first image displayed on a display panel when driving edge identification pixels to emit light, identifying the first image by adopting an edge detection algorithm to determine a pixel boundary area of the display panel, obtaining a second image displayed on the display panel when driving the display pixels to emit light, and determining whether the display panel has display defects according to the pixel boundary area and the second image. The edge identification pixels additionally arranged in the display panel are driven to emit light, so that the pixel boundary area of the display panel is effectively identified, and the pixel boundary area is compared with a second image when the display pixels emit light, so that whether the display panel has a display defect or not can be effectively detected, the human resources are reduced, and the detection efficiency and the detection accuracy are improved.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a detection method and a detection device for a display panel, and a display panel.
Background
The inventor of the present invention has found through long-term research that in a production process of an organic light-emitting diode (OLED) display panel, display defects such as poor dark lines may occur in display pixels, which affects a yield of products, and therefore, in a manufacturing process of the display panel, it is necessary to detect whether the display panel has the display defects.
Currently, an image of a display panel during light emission of display pixels may be collected by an Automated Optical Inspection (AOI) apparatus, and whether or not unlit display pixels exist in the image is observed by naked eyes, so as to determine whether or not a display defect exists in the display panel.
However, the manual detection of the display defect requires a lot of manpower resources, and the detection efficiency and the detection accuracy are low.
Disclosure of Invention
In view of the foregoing problems, embodiments of the present application provide a method for detecting a display panel, an apparatus for detecting a display panel, and a display panel, in which a pixel boundary region is effectively detected by edge identification pixels, so that whether a display defect exists in the display panel can be detected, human resources are reduced, and detection efficiency and detection accuracy are improved.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
a first aspect of an embodiment of the present application provides a method for detecting a display panel, where the display panel includes display pixels and edge identification pixels, and the method includes: acquiring a first image displayed on the display panel when the driving edge recognition pixel emits light; identifying the first image by adopting an edge detection algorithm to determine a pixel boundary area of the display panel; acquiring a second image displayed on the display panel when the display pixels are driven to emit light; and determining whether the display panel has a display defect according to the pixel boundary area and the second image.
Therefore, the embodiment of the application drives the edge identification pixels additionally arranged in the display panel to emit light, so that the pixel boundary area of the display panel is effectively identified, and the pixel boundary area is compared with the second image when the display pixels emit light, whether the display panel has the display defects can be effectively detected, and whether the display panel has the display defects is determined without visual observation in the detection process, so that the human resources are reduced, the detection efficiency and the detection accuracy are improved, the risk that the display panel with the display defects is missed or mistakenly detected and flows into a downstream process is reduced, and the loss of manpower and material resources is reduced.
In one implementation, determining whether the display panel has a display defect according to the pixel boundary area and the second image includes: detecting whether each display pixel in a pixel boundary area corresponding to the second image has a dark pixel which is not lightened or not; and when the unlighted dark point pixels exist, determining whether the display panel has a display defect according to the distribution information of the dark point pixels. Therefore, whether the display panel has the display defects or not can be determined by identifying whether each display pixel is normally lightened or not, and the detection mode is simpler.
In one implementation, determining whether the display panel has a display defect according to the distribution information of the dark point pixels includes: and when the plurality of dark point pixels are continuously distributed and the number of the plurality of dark point pixels which are continuously distributed is greater than or equal to a first preset number, determining that the display panel has poor dark lines. In this way, the defect type of the display defect, which may be a dark line defect, may be further determined according to the distribution position of the dark point pixels and the number of the dark point pixels.
In one implementation, determining whether the display panel has a display defect according to the distribution information of the dark point pixels includes: and when the plurality of dark point pixels are distributed in a dispersed manner and the number of the plurality of dark point pixels is greater than or equal to a second preset number, determining that the display panel has poor dark points. In this way, the defect type of the display defect, which may be a dark-spot defect, may be further determined according to the distribution position of the dark-spot pixels and the number of the dark-spot pixels.
In one implementation, detecting whether each display pixel in a pixel boundary region corresponding to the second image has a dark-point pixel that is not lighted includes: acquiring a gray-scale value of each display pixel in a pixel boundary area corresponding to the second image; when the gray scale value of the display pixel is smaller than or equal to a preset gray scale threshold value, determining that the display pixel is a dark pixel which is not lightened; and when the gray-scale value of the display pixel is larger than the preset gray-scale threshold value, determining that the display pixel is a lighted normal pixel. Therefore, the gray-scale value of each display pixel is obtained and compared with the preset gray-scale threshold value, so that whether the display pixel is a dark-point pixel or a normal pixel is determined, and the detection mode is simple.
In one possible implementation, identifying the first image using an edge detection algorithm to determine a pixel boundary region of the display panel includes: identifying a convex hull point set in the first image by adopting a convex hull algorithm; and sequentially connecting all convex hull points in the convex hull point set to form a minimum convex polygon, and taking the minimum convex polygon as a pixel boundary area of the display panel. Thus, the present application may identify the pixel boundary region of the display panel through a convex hull algorithm.
In one implementation, identifying a set of convex hull points in the first image using a convex hull algorithm includes: selecting one edge identification pixel from the first image as a starting convex package point; the initial convex hull point is an edge identification pixel with the largest coordinate value or the smallest coordinate value in the first image along the target coordinate direction, and the target coordinate direction is the abscissa direction and/or the ordinate direction; screening a plurality of target convex wrap points from the rest edge identification pixels outside the initial convex wrap point in a preset mode by taking the initial convex wrap point as a reference point; and taking the set of the starting convex hull point and the plurality of target convex hull points as a convex hull point set.
A second aspect of embodiments of the present application provides a detection apparatus for a display panel, the display panel including display pixels and edge recognition pixels, the apparatus including: the first image acquisition module is used for acquiring a first image displayed on the display panel when the driving edge identification pixel emits light; the pixel boundary detection module is used for identifying the first image by adopting an edge detection algorithm so as to determine a pixel boundary area of the display panel; the second image acquisition module is used for acquiring a second image displayed on the display panel when the display pixels are driven to emit light; and the display defect detection module is used for determining whether the display panel has display defects according to the pixel boundary area and the second image.
A third aspect of an embodiment of the present application provides a display panel including display pixels and edge recognition pixels; the display pixel comprises a pixel driving circuit and a first light-emitting element, wherein the anode of the first light-emitting element is connected with the pixel driving circuit, the cathode of the first light-emitting element is connected with a first power signal line, and the pixel driving circuit is connected with a reference signal line; the edge identification pixel includes a second light emitting element having an anode connected to the reference signal line and a cathode connected to the first power signal line; when the driving edge identification pixel emits light, the reference voltage input by the reference signal line is positive voltage; when the display pixels are driven to emit light, the reference voltage input by the reference signal line is negative voltage.
In one implementation, the display panel includes a display area and a non-display area, and the edge identification pixel is located at an edge of the display area; preferably, the edge recognition pixels are located at corner positions of the display area.
A fourth aspect of the embodiments of the present application provides a detection system for a display panel, including the detection apparatus for a display panel provided in the second aspect, and the display panel provided in the third aspect.
A fifth aspect of embodiments of the present application provides a detection apparatus, including a memory and a processor, where the memory is used to store a computer program, and the processor is used to call the computer program to execute the detection method of the display panel provided in the first aspect.
A sixth aspect of embodiments of the present application provides a computer-readable storage medium, in which a computer program or instructions are stored, and when the computer program or instructions are executed, the method for detecting a display panel provided in the first aspect is implemented.
In each of the possible implementations of the second aspect to the sixth aspect, the effect is similar to that in the first aspect and the possible design of the first aspect, and details are not repeated here.
The construction and other objects and advantages of the present application will be more apparent from the description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following descriptions are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a display pixel at an edge position without dark line defect and with dark line defect according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an edge identification pixel according to an embodiment of the present disclosure;
fig. 4 is a flowchart of a method for detecting a display panel according to an embodiment of the present disclosure;
fig. 5 is a flowchart illustrating a method for detecting a display panel according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram illustrating a principle of identifying a pixel boundary region by using a convex hull algorithm according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram illustrating another example of identifying a pixel boundary region by using a convex hull algorithm according to an embodiment of the present disclosure;
fig. 8 is a block diagram of a detecting apparatus for a display panel according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a detection apparatus according to an embodiment of the present application.
Detailed Description
With the continuous development of display technology, the OLED display panel gradually becomes a trend of industry development due to its characteristics of self-luminescence, high response speed, high contrast, flexibility, and the like.
The inventor has found that, in the production process of the OLED display panel, some display defects may occur in the display pixels, for example, defects such as poor dark lines may occur in the display pixels at the edge of the OLED display panel. As shown in fig. 1, (a) in fig. 1 is a schematic diagram showing that no dark line defect occurs in the display pixels at the edge positions of the display panel, that is, the display pixels at the edge positions all emit light normally, and (b) in fig. 1 is a schematic diagram showing that the dark line defect occurs in the display pixels at the edge positions of the display panel. Comparing the display pixels at the edge positions shown in (a) and (b) in fig. 1, it can be seen that, in the area where the rectangular frame is located, the display pixels at the edge positions shown in (b) in fig. 1 are missing the display pixels of the uppermost row with respect to the display pixels at the edge positions shown in (a) in fig. 1. The reason for this is that, since the display panel shown in fig. 1 (b) has a dark line defect at the edge position, the display pixels in the uppermost row cannot emit light normally and cannot be displayed.
If the display pixels at the edge of the display panel have the defect of poor dark lines, the display pixels cannot display the edge content in the subsequently manufactured display products. Therefore, in the manufacturing process of the display panel, it is necessary to detect whether the display panel has an edge dark line defect.
In some related technologies, each display pixel may be driven to emit light by a pixel driving circuit, and then an AOI device is used to collect an image of the display panel when the display pixel emits light, and whether an unlit display pixel exists in the image is observed by naked eyes, so as to determine whether the display panel has a display defect such as poor edge dark line.
However, this method of manually detecting display defects requires a lot of manpower resources, and has low detection efficiency and accuracy. When a display defect occurs in a display panel, if the display defect cannot be detected in time, the display panel with the display defect may flow into a downstream process due to missing detection or error detection, thereby causing additional loss of manpower and material resources.
In view of the foregoing technical problems, embodiments of the present application provide a detection method for a display panel, a detection apparatus for a display panel, and a display panel, where a first image displayed on the display panel is obtained when driving an edge recognition pixel to emit light, the first image is recognized by using an edge detection algorithm to determine a pixel boundary area of the display panel, a second image displayed on the display panel is obtained when driving the display pixel to emit light, and whether a display defect exists in the display panel is determined according to the pixel boundary area and the second image. The edge identification pixels additionally arranged in the display panel are driven to emit light, so that the pixel boundary area of the display panel is effectively identified, the pixel boundary area is compared with a second image generated when the display pixels emit light, whether the display panel has a display defect can be effectively detected, whether the display panel has the display defect or not is determined without visual observation in the detection process, so that the human resources are reduced, the detection efficiency and the detection accuracy are improved, the risk that the display panel with the display defect is missed or mistakenly detected and flows into a downstream process is reduced, and the loss of manpower and material resources is reduced.
In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application. 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.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a display panel provided in an embodiment of the present application. The display panel includes a display area 21 and a non-display area surrounding the display area 21, the non-display area including a pad area 22 (a lead area to be conducted with an external circuit). Edge identification pixels 210 are provided at the edges of the display area 21. So that the pixel boundary region of the display panel is detected by the edge recognition pixel 210. In the display area 21, display pixels (not shown in fig. 2) are disposed in areas other than the area where the edge recognition pixel 210 is located, and the display pixels are mainly used for performing screen display. Preferably, the edge recognition pixels 210 are disposed at four corner positions of the display area 21, further optimizing the specific positions of the edge recognition pixels 210.
As shown in fig. 2, two edge recognition pixels 210 are disposed at the positions of the upper left corner, the lower left corner, the upper right corner, and the lower right corner of the display area 21.
It should be noted that the number of the edge identification pixels 210 at each corner position of the display area 21 is not limited to 2, and may also be 3, 4, etc., and the specific number of the edge identification pixels 210 at each corner position of the display area 21 may be set according to actual requirements. And each edge identification pixel 210 is near the boundary of the display area 21 and the non-display area.
The display pixel comprises a pixel driving circuit and a first light-emitting element, wherein the pixel driving circuit comprises a driving transistor, a data writing transistor, a reset transistor, a light-emitting control transistor, a storage capacitor and other devices. The source of the reset transistor in the pixel driving circuit is connected to a reference signal line Vref, and the drain of the reset transistor is connected to the gate of the driving transistor, and the reset transistor is used to reset the gate of the driving transistor by a reference voltage input through the reference signal line Vref.
In addition, the pixel driving circuit is also connected with a reset signal line, a scanning signal line, a light-emitting control signal line, a Data line Data and a second power signal line VDD; an anode of the first light emitting element is connected to the pixel driving circuit, and a cathode of the first light emitting element is connected to the first power source signal line VSS.
It should be noted that, in the embodiment of the present application, reference may be made to a pixel driving circuit currently used for driving a light emitting element to emit light, and details are not described here.
As shown in fig. 3, the edge recognition pixel 210 includes a second light emitting element EL whose anode is connected to the reference signal line Vref and whose cathode is connected to the first power signal line VSS, i.e., the anode of the second light emitting element EL is driven with the reference signal line Vref and the cathode of the second light emitting element EL is driven with the first power signal line VSS.
The second light emitting element EL includes an anode layer 211, a light emitting layer 212, and a cathode layer 213, which are stacked, and the light emitting layer 212 is located between the anode layer 211 and the cathode layer 213.
It should be noted that the film structure of the second light-emitting element EL is the same as the film structure of the first light-emitting element included in the display pixel, and the film manufacturing process of the second light-emitting element EL is also the same as the film manufacturing process of the first light-emitting element.
Referring to fig. 4, fig. 4 is a flowchart of a method for detecting a display panel according to an embodiment of the present disclosure, which may specifically include the following steps:
in step 401, a first image displayed on the display panel is acquired while the edge recognition pixels are driven to emit light.
In the embodiment of the present application, the reference signal line Vref may input a reference voltage to the anode of the second light emitting element EL in the edge recognition pixel 210, and the first power supply signal line VSS may input a first power supply voltage to the cathode of the second light emitting element EL in the edge recognition pixel 210. At this time, the reference voltage input to the anode of the second light-emitting element EL by the reference signal line is controlled to be a positive voltage, and the first power supply voltage input to the cathode of the second light-emitting element EL by the first power supply signal line VSS is controlled to be a negative voltage, so that the second light-emitting element EL in the edge recognition pixel 210 is driven to emit light.
The reset signal line, the light-emitting control signal line and the scanning signal line which are connected with the pixel driving circuit of the display pixel can not input control signals to the pixel driving circuit, so that the transistors of the grid electrode, the reset signal line, the light-emitting control signal line and the scanning signal line are all in a cut-off state; the second power supply voltage input to the second power supply signal line VDD connected to the pixel driving circuit of the display pixel and the Data voltage input to the Data line Data are both 0V. In this driving manner, the first light emitting element in the display pixel is made not to emit light.
When each of the edge recognition pixels 210 is driven to emit light in the above manner while each of the display pixels is controlled not to emit light, the first image displayed on the display panel is captured using the image capturing device. The image capturing device may be a camera or a video camera, and is illustratively a charge-coupled device (CCD) camera with high resolution and high precision.
After the first image is acquired by the image acquisition device, the acquired first image is sent to the detection device of the display panel, so that the detection device of the display panel can acquire the first image displayed on the display panel.
In some embodiments, the image capturing device may be integrated into the detection device of the display panel, and of course, the image capturing device and the detection device of the display panel may be provided separately.
In the embodiment of the present application, since the edge identification pixels 210 on the display panel are all disposed at the boundary position of the display area 21, after the first image displayed on the display panel is acquired, the detection device of the display panel can identify the distribution position where the edge identification pixels 210 are located in the first image through an edge detection algorithm, so as to determine the pixel boundary area of the display panel. The pixel boundary region refers to a boundary region of display pixels distributed on the display panel.
In step 403, a second image displayed on the display panel is acquired while the display pixels are driven to emit light.
In the embodiment of the present application, a reset signal line, a light emission control signal line, and a scanning signal line, which are connected to a pixel driving circuit of a controllable display pixel, all input control signals to the pixel driving circuit according to corresponding driving timings, so that transistors, of which gates are connected to the reset signal line, the light emission control signal line, and the scanning signal line, are in a conducting state in corresponding time periods; for example, the second power voltage input to the second power signal line VDD to which the pixel driving circuit of the display pixel is connected may be 4V to 6V, the Data voltage input to the Data line Data may be 0V to 8V, the reference voltage input to the reference signal line Vref may be a negative voltage, e.g., -2V to-4V, the reference voltage input to the reference signal line Vref may be a negative voltage, and the first power voltage input to the first power signal line VSS may also be a negative voltage, e.g., -2V to-6V. In this driving manner, the first light emitting element in the display pixel is caused to emit light.
Since the reference voltage inputted from the reference signal line Vref is negative voltage, the reference voltage inputted from the reference signal line Vref to the anode of the second light emitting element EL in the edge identification pixel 210 is also negative voltage; the first power supply voltage input to the first power supply signal line VSS is a negative voltage, so that the first power supply voltage input to the cathode of the second light-emitting element EL in the edge recognition pixel 210 by the first power supply signal line VSS is also a negative voltage. Therefore, in this driving manner, the second light emitting element EL in the edge recognition pixel 210 can be made to emit no light.
When the display pixels are driven to emit light and the edge recognition pixels 210 are controlled not to emit light in the manner, the image acquisition device is used for acquiring the second image displayed on the display panel and sending the acquired second image to the detection device of the display panel, so that the detection device of the display panel can acquire the second image displayed on the display panel.
It is understood that the order of step 401, step 402 and step 403 may be changed, and may be specifically set according to the actual situation, which is not limited herein.
And step 404, determining whether the display panel has a display defect according to the pixel boundary area and the second image.
In the embodiment of the present application, since the display pixels on the display panel are actually located in the pixel boundary area, that is, the pixel boundary area defines the position range of all the display pixels, after the pixel boundary area of the display panel and the second image displayed on the display panel when the display pixels emit light are acquired, the pixel boundary area and the second image may be compared, and whether the display panel has a display defect or not may be detected.
The display defect may be a defect such as a dark spot defect or a dark line defect. Alternatively, the dark line defect may be an edge dark line defect.
It can be understood that, in the embodiment of the present application, a display defect of a display pixel located at an edge position of a display area in a display panel may be determined, or a display defect of a display pixel located at a middle position of the display area may also be determined, which is not limited herein.
Therefore, the edge identification pixels additionally arranged in the display panel are driven to emit light so as to effectively identify the pixel boundary area of the display panel, and the pixel boundary area is compared with the second image when the display pixels emit light, so that whether the display panel has the display defects can be effectively detected.
Referring to fig. 5, fig. 5 is a specific flowchart of a method for detecting a display panel according to an embodiment of the present application, which may specifically include the following steps:
The specific implementation manner of this step is similar to that of step 401, and is not described herein again to avoid repetition.
In the embodiment of the present application, the edge detection algorithm may be a convex hull algorithm. After acquiring the first image displayed on the display panel, each edge identification pixel 210 in the first image may be analyzed by a convex hull algorithm to find a convex hull point from the plurality of edge identification pixels 210, thereby forming a convex hull point set.
In some embodiments, one of the edge identification pixels 210 in the first image may be selected as a starting convex hull point, a plurality of target convex hull points are selected from the rest of the edge identification pixels 210 outside the starting convex hull point in a preset manner by using the starting convex hull point as a reference point, and a set of the starting convex hull point and the plurality of target convex hull points is used as a convex hull point set.
The initial convex hull point is an edge identification pixel 210 in the first image, where the coordinate value is the largest or the smallest along the target coordinate direction, and the target coordinate direction is the abscissa direction and/or the ordinate direction.
For the plurality of edge identification pixels 210, the edge identification pixel 210 with the largest abscissa, the edge identification pixel 210 with the smallest abscissa, the edge identification pixel 210 with the largest ordinate, and the edge identification pixel 210 with the smallest ordinate are necessarily located on the convex hull. Therefore, any one of the edge recognition pixel 210 in the first image in which the coordinate value in the abscissa direction is largest (i.e., the edge recognition pixel 210 in which the abscissa is largest), the edge recognition pixel 210 in the first image in which the coordinate value in the abscissa direction is smallest (i.e., the edge recognition pixel 210 in which the abscissa is smallest), the edge recognition pixel 210 in the first image in which the coordinate value in the ordinate direction is largest (i.e., the edge recognition pixel 210 in which the ordinate is largest), and the edge recognition pixel 210 in the first image in which the coordinate value in the ordinate direction is smallest (i.e., the edge recognition pixel 210 in which the ordinate is smallest) may be taken as the start convex inclusion point.
It is to be appreciated that in some scenarios, the starting convex hull point may also be any of the edge identification pixel 210 with the largest abscissa and the largest ordinate, the edge identification pixel 210 with the largest abscissa and the smallest ordinate, the edge identification pixel 210 with the smallest abscissa and the largest ordinate, and the edge identification pixel 210 with the smallest abscissa and the smallest ordinate.
Illustratively, as shown in fig. 6, the edge recognition pixel 210 in the first image includes a first pixel a1, a second pixel a2, a third pixel A3, a fourth pixel a4, a fifth pixel a5, a sixth pixel A6, a seventh pixel a7, an eighth pixel A8, a ninth pixel a9, a tenth pixel a10, an eleventh pixel a11, a twelfth pixel a12, a thirteenth pixel a13, a fourteenth pixel a14, and a fifteenth pixel a 15. The X direction is the abscissa direction and the Y direction is the ordinate direction.
The edge identification pixel 210 with the smallest abscissa may be selected as the starting convex hull point. Since the abscissa values of the first pixel a1 and the eighth pixel A8 are equal and smaller than those of the other edge recognition pixels 210, and the ordinate value of the first pixel a1 is larger than that of the eighth pixel A8, the edge recognition pixel 210 with a larger ordinate value can be selected as the start bump point, i.e., the first pixel a1 can be selected as the start bump point.
It is to be understood that any one of the eighth pixel A8, the ninth pixel a9, the fourth pixel a4, the fifth pixel a5, the sixth pixel a6 and the seventh pixel a7 may also be selected as the start bump.
After the starting convex hull point is selected, a plurality of target convex hull points can be screened from the remaining edge identification pixels 210, and the convex hull point set also includes the starting convex hull point and the screened target convex hull points.
In the embodiment of the present application, the convex hull algorithm may be a volume-Wrapping algorithm (Gift-Wrapping algorithm), and how to screen the target convex hull point through the volume-Wrapping algorithm is described below through two specific implementation manners.
In an implementation mode, the starting convex hull point is taken as a datum point, the positive direction of the abscissa is taken as a starting direction, and the starting ray is rotated in a preset direction, wherein the preset direction is a clockwise direction or an anticlockwise direction; taking the edge identification pixel 210 which is touched by the first initial ray as a target convex hull point; and switching the target convex hull points as datum points, and continuing rotating the target ray formed by the target convex hull point and the previous convex hull point according to the preset direction until one of the target convex hull points is touched by the target ray again.
For example, as shown in fig. 6, a first pixel a1 is selected as a start convex hull point, a start ray L1 is formed with the first pixel a1 as a reference point and the positive abscissa direction as a start direction, the start ray L1 is rotated clockwise, and the edge identification pixel 210 which is first touched by the start ray L1 is taken as a target convex hull point.
It should be noted that in some scenarios, there may be at least two edge recognition pixels 210 with equal ordinate values, and therefore, the start ray L1 rotates clockwise, and the first touched edge recognition pixel 210 may include at least two edge recognition pixels 210, so that the edge recognition pixel 210 closer to the start convex hull point may be discarded, and the edge recognition pixel 210 farther from the start convex hull point may be used as the target convex hull point.
It can be seen that the ordinate values of the second pixel a2 and the third pixel A3 in fig. 6 are equal, so that the start ray L1 rotates clockwise, the first touched edge identification pixel 210 includes the second pixel a2 and the third pixel A3, and the distance between the start convex hull and the second pixel a2 is shorter, and the distance between the start convex hull and the third pixel A3 is longer, so that the third pixel A3 can be regarded as a target convex hull.
Then, the third pixel A3 is switched as a reference point, and a first target ray is formed by a connecting line between the third pixel A3 and the first pixel a1, and since the third pixel A3 is collinear with the first pixel a1, the first target ray is the starting ray L1. The first target ray is rotated clockwise, and the edge identification pixel 210 first touched by the first target ray is the fourth pixel a4, so the fourth pixel a4 is used as a target convex point.
Next, the fourth pixel a4 is switched as a reference point, a second target ray L2 is formed by a connection line between the fourth pixel a4 and the third pixel A3, the second target ray L2 is rotated clockwise, and the edge recognition pixel 210 which is first touched by the second target ray L2 is the fifth pixel a5, so that the fifth pixel a5 is used as a target convex package point.
In the above manner, the fifth pixel a5 is continuously switched to be the reference point, the third target ray L3 is formed by the connection line between the fifth pixel a5 and the fourth pixel a4, and after the third target ray L3 is rotated clockwise, the first touched edge identification pixel 210 is the sixth pixel a6, and therefore, the sixth pixel a6 is used as a target convex package point.
The sixth pixel a6 is switched to be the reference point, the fourth target ray L4 is formed by the connection line between the sixth pixel a6 and the fifth pixel a5, and the first touched edge recognition pixel 210 is the seventh pixel a7 after the fourth target ray L4 is rotated clockwise, so that the seventh pixel a7 is used as a target convex package point.
The seventh pixel a7 is continuously switched to be the reference point, the fifth target ray L5 is formed by the connection line between the seventh pixel a7 and the sixth pixel a6, and after the fifth target ray L5 is rotated clockwise, the first touched edge identification pixel 210 is the eighth pixel A8, and therefore the eighth pixel A8 is used as a target convex package point.
The eighth pixel A8 is continuously switched to be the reference point, a sixth target ray L6 is formed by a connection line between the eighth pixel A8 and the seventh pixel a7, and after the sixth target ray L6 is rotated clockwise, the first touched edge identification pixel 210 is the first pixel a 1.
The first pixel a1 is continuously switched to be the reference point, a seventh target ray L7 is formed by a connection line between the first pixel a1 and the eighth pixel A8, and after the seventh target ray L7 is rotated clockwise, the first touched edge identification pixel 210 is the ninth pixel a9, so that the ninth pixel a9 is used as a target convex package point.
The ninth pixel a9 is continuously switched to be the reference point, an eighth entry marked ray L8 is formed by a connection line between the ninth pixel a9 and the first pixel a1, after the eighth entry marked ray L8 is rotated clockwise, the first touched edge identification pixel 210 is the third pixel A3, and at this time, the third pixel A3 is touched by the ray again, so that the process of finding the target convex hull point is finished.
Therefore, in the above manner, the plurality of target convex hull points in the edge identification pixel 210 can be found as: a third pixel A3, a fourth pixel a4, a fifth pixel a5, a sixth pixel a6, a seventh pixel a7, an eighth pixel A8, and a ninth pixel a 9.
In another implementation manner, the starting convex hull point is taken as a reference point, and the starting convex hull point and the rest edge identification pixels 210 form vectors to be screened respectively; screening an outermost target vector from a plurality of vectors to be screened; and taking the edge identification pixels 210 on the target vector as target convex hull points, switching the target convex hull points as reference points, continuously forming a plurality of vectors to be screened and screening the outermost target vectors from the vectors until the target convex hull points on the target vectors are initial convex hull points.
For example, as shown in fig. 7, a fifth pixel a5 may be selected as a start convex point, and the fifth pixel a5 is taken as a reference point, so that the fifth pixel a5 and the remaining edge identification pixels 210 form vectors to be filtered (as shown by dashed lines in fig. 7).
Taking the outermost target vector as the leftmost target vector as an example, the leftmost target vector is selected from the vectors to be filtered to be the vector to be filtered formed by the fifth pixel a5 and the sixth pixel a6, and therefore, the sixth pixel a6 is taken as one target convex hull point.
Then, the sixth pixel a6 is switched to be the reference point, the sixth pixel a6 and the remaining edge recognition pixels 210 form vectors to be filtered, and the leftmost target vector is selected from the vectors to be filtered, which is the vector to be filtered formed by the sixth pixel a6 and the seventh pixel a7, so that the seventh pixel a7 is used as one target convex hull point.
According to the mode, the target convex hull points subsequently and sequentially screened are respectively as follows: an eighth pixel A8, a first pixel a1, a ninth pixel a9, a third pixel A3, and a fourth pixel a 4.
Finally, the fourth pixel a4 is switched to be the reference point, the fourth pixel a4 and the remaining edge recognition pixels 210 form vectors to be filtered, the leftmost target vector is selected from the vectors to be filtered, the vectors to be filtered are formed by the fourth pixel a4 and the fifth pixel a5, and the fifth pixel a5 is the start convex hull point, so the process of searching for the target convex hull point is finished.
It will be appreciated that the outermost target vector may also be the rightmost target vector. In addition, the above process provides two specific implementation processes of the convex hull algorithm, and of course, the convex hull algorithm in the embodiment of the present application may also be in other manners, such as a stepping method.
And 503, sequentially connecting all convex hull points in the convex hull point set to form a minimum convex polygon, and using the minimum convex polygon as a pixel boundary area of the display panel.
In the embodiment of the present application, after the convex hull point set in the first image is identified, the convex hull points (including the starting convex hull point and the plurality of target convex hull points) in the convex hull point set are sequentially connected in a clockwise or counterclockwise direction, and a minimum convex polygon, that is, a pixel boundary region of the display panel, can be obtained.
The specific implementation manner of this step is similar to that of step 403, and is not described herein again to avoid repetition.
In the embodiment of the present application, since the display pixels on the display panel are actually located in the pixel boundary area, after the pixel boundary area of the display panel and the second image displayed on the display panel when the display pixels emit light are acquired, it can be detected whether there are dark-point pixels that are not lit in the pixel boundary area corresponding to the second image.
In an implementation manner, whether there are dark-point pixels that are not lighted in the pixel boundary region corresponding to the second image can be detected in the following manner. Specifically, the gray-scale value of each display pixel in the pixel boundary area corresponding to the second image is obtained; when the gray scale value of the display pixel is smaller than or equal to a preset gray scale threshold value, determining that the display pixel is a dark pixel which is not lightened; and when the gray scale value of the display pixel is greater than the preset gray scale threshold value, determining that the display pixel is a lighted normal pixel.
The preset gray level threshold may be set according to actual conditions, for example, the preset gray level threshold may be 0 gray level, 5 gray level, 10 gray level, or the like. When the gray scale value of a certain display pixel is smaller than or equal to a preset gray scale threshold value, the display pixel is not normally lightened, and the display pixel is determined to be a dark pixel; and when the gray scale value of one display pixel is larger than a preset gray scale threshold value, the display pixel is normally lightened, and the display pixel is determined as a normal pixel.
When it is determined that there are dark-point pixels that are not lit in the respective display pixels in the pixel boundary region corresponding to the second image, the following step 506 is executed; and when it is determined that there is no unlit dark pixel in each display pixel in the pixel boundary region corresponding to the second image, that is, the display pixels in the display panel can all emit light normally, it is determined that there is no display defect in the display panel, that is, the display panel is a qualified product.
In the manufacturing process of the product, if the display panel has a few dark pixels, the display panel can be considered as a qualified product. Therefore, when it is detected that the unlit dark-point pixels exist in each display pixel in the pixel boundary region corresponding to the second image, whether the display panel has the display defect can be further determined according to the distribution information of the dark-point pixels.
In some scenes, when a plurality of dark point pixels are continuously distributed and the number of the plurality of dark point pixels which are continuously distributed is greater than or equal to a first preset number, it is determined that the display panel has poor dark lines.
When the number of the dark point pixels in the display panel is multiple, the distribution positions of the multiple dark point pixels can be determined firstly, if the multiple dark point pixels are located in the same row and are adjacent to each other, or the multiple dark point pixels are located in the same column and are adjacent to each other, the multiple dark point pixels are described as being continuously distributed, then, the size relation between the number of the multiple dark point pixels which are continuously distributed and a first preset number is compared, and when the number of the multiple dark point pixels which are continuously distributed is larger than or equal to the first preset number, the display panel is determined to have poor dark lines.
The first preset number can be set according to an empirical value. For example, the first preset number may be 20, and when the number of the continuously distributed dark dot pixels is greater than or equal to 20, it may be determined that the display panel has a dark line defect.
In other scenes, when a plurality of dark point pixels are distributed in a dispersed manner and the number of the dark point pixels is greater than or equal to a second preset number, it is determined that the display panel has poor dark points.
When the number of the dark point pixels in the display panel is multiple, the distribution positions of the multiple dark point pixels can be determined first, and if normal pixels exist at positions among the multiple dark point pixels, the distributed distribution of the multiple dark point pixels is described. And then comparing the size relation between the number of the dispersedly distributed dark point pixels and a second preset number, and determining that the display panel has poor dark points when the number of the dark point pixels is greater than or equal to the second preset number.
The second preset number may also be set according to an empirical value, and the second preset number may be equal to or different from the first preset number, which is not limited in the embodiment of the present application. For example, the second preset number may be 1, 5, 10, 30, etc.
Taking the first preset number equal to the second preset number as an example, when the number of the dark point pixels in the display panel is smaller than the first preset number (the dark point pixels may be distributed continuously or dispersedly), it may be determined that the display panel has no display defect, that is, the display panel is a qualified product.
Therefore, the embodiment of the application drives the edge identification pixels additionally arranged in the display panel to emit light, the pixel boundary area of the display panel is effectively identified through the convex hull algorithm, whether the unlit dark point pixels exist in the pixel boundary area corresponding to the second image or not is detected, whether the display panel has the display defects or not is effectively detected, whether the display panel has the display defects or not is determined without visual observation in the detection process, the human resources are reduced, the detection efficiency and the detection accuracy are improved, the risk that the display panel with the display defects leaks to be detected and flows into a downstream process is reduced, and the loss of the human resources and the material resources is reduced.
The above description has been made on the detection method of the display panel according to the embodiment of the present application, and the following description is made on the detection apparatus of the display panel according to the embodiment of the present application, which performs the detection method of the display panel described above. The method and the device can be mutually combined and cited, and the detection device of the display panel provided by the embodiment of the application can execute the steps of the detection method of the display panel.
Referring to fig. 8, an embodiment of the present application further provides a detection apparatus for a display panel. The display panel comprises display pixels and edge identification pixels, and the detection device of the display panel comprises: a first image acquisition module 801, a pixel boundary detection module 802, a second image acquisition module 803, and a display defect detection module 804.
The first image obtaining module 801 is configured to obtain a first image displayed on the display panel when the edge identification pixel 210 is driven to emit light; a pixel boundary detection module 802, configured to identify the first image by using an edge detection algorithm to determine a pixel boundary area of the display panel; a second image obtaining module 803, configured to obtain a second image displayed on the display panel when the display pixels are driven to emit light; and a display defect detection module 804, configured to determine whether the display panel has a display defect according to the pixel boundary area and the second image.
In an alternative embodiment, the display defect detection module 804 includes: a dark spot pixel detection sub-module and a display defect detection sub-module. The dark pixel detection submodule is used for detecting whether each display pixel in a pixel boundary area corresponding to the second image has an unlighted dark pixel or not; and the display defect detection submodule is used for determining whether the display panel has display defects or not according to the distribution information of the dark point pixels when the unlighted dark point pixels exist.
In an alternative embodiment, the display defect detection sub-module includes: and the dark line defect detection unit is used for determining that the display panel has dark line defects when the plurality of dark point pixels are continuously distributed and the number of the plurality of continuously distributed dark point pixels is greater than or equal to a first preset number.
In an alternative embodiment, the display defect detection sub-module includes: and the dark spot defect detection unit is used for determining that the display panel has dark spot defects when the plurality of dark spot pixels are distributed in a dispersed manner and the number of the dark spot pixels is greater than or equal to a second preset number.
It can be understood that the display defect detecting module 804 can detect that the display panel has both the dark line defect and the dark spot defect. In an alternative embodiment, the dark pixel detection sub-module includes: the device comprises a gray-scale value acquisition unit, a first determination unit and a second determination unit. The gray-scale value acquisition unit is used for acquiring the gray-scale value of each display pixel in the pixel boundary region corresponding to the second image; the first determining unit is used for determining the display pixel as a dark-point pixel which is not lightened when the gray-scale value of the display pixel is less than or equal to a preset gray-scale threshold value; and the second determining unit is used for determining the display pixel as a lighted normal pixel when the gray-scale value of the display pixel is greater than the preset gray-scale threshold value.
In an alternative embodiment, the pixel boundary detection module 802 includes: a convex hull point set identification sub-module and a pixel boundary region determination sub-module. The convex hull point set identification submodule is used for identifying a convex hull point set in the first image by adopting a convex hull algorithm; and the pixel boundary area determining submodule is used for sequentially connecting all convex hull points in the convex hull point set to form a minimum convex polygon which is used as the pixel boundary area of the display panel.
In an alternative embodiment, the convex hull point set identifying sub-module includes: the device comprises an initial convex hull point selecting unit, a target convex hull point screening unit and a convex hull point set determining unit. An initial convex hull point selecting unit, configured to select one of the edge identification pixels 210 from the first image as an initial convex hull point, where the initial convex hull point is an edge identification pixel 210 with a largest coordinate value or a smallest coordinate value in a target coordinate direction in the first image, and the target coordinate direction is an abscissa direction and/or an ordinate direction; the target convex hull point screening unit is used for screening a plurality of target convex hull points from the rest edge identification pixels 210 outside the initial convex hull point according to a preset mode by taking the initial convex hull point as a reference point; and the convex hull point set determining unit is used for taking the set of the starting convex hull point and the plurality of target convex hull points as a convex hull point set.
In an alternative embodiment, the target convex hull point screening unit includes: the system comprises an initial ray rotation subunit, a target convex hull point first determination subunit and a target ray rotation subunit. The initial ray rotating subunit is used for rotating the initial ray according to a preset direction by taking the initial convex wrap point as a reference point and taking the positive direction of the abscissa as an initial direction, wherein the preset direction is a clockwise direction or an anticlockwise direction; a target convex hull point first determining subunit, configured to use the edge identification pixel 210 that is touched by the initial ray first as a target convex hull point; and the target ray rotating subunit is used for switching the target convex wrap point as a reference point, and continuing to rotate according to the preset direction by using the target ray formed by the target convex wrap point and the previous convex wrap point until one of the target convex wrap points is touched by the target ray again.
In an alternative embodiment, the target convex hull point screening unit includes: the vector forming subunit to be screened, the target vector screening subunit and the target convex hull point second determining subunit. A vector to be screened forming subunit, configured to form vectors to be screened with the initial convex hull point as a reference point and with the remaining edge identification pixels 210 respectively; the target vector screening subunit is used for screening the outermost target vector from the vectors to be screened; and the target convex hull point second determining subunit is used for taking the edge identification pixel 210 on the target vector as a target convex hull point, switching the target convex hull point as a reference point, continuously forming a plurality of vectors to be screened, and screening the outermost target vector from the vectors until the target convex hull point on the target vector is the starting convex hull point.
The detection apparatus of the display panel in the embodiment of the present application can be correspondingly used to perform the steps performed in the above method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again. Furthermore, all or part of the modules in the detection device of the display panel may be implemented by software, hardware, firmware, or any combination thereof. The modules can be embedded in a processor of the detection device in a hardware form or independent of the processor of the detection device, and can also be stored in a memory of the detection device in a software form, so that the processor can call and execute operations corresponding to the modules.
The embodiment of the application further provides a detection system of the display panel, and the detection system of the display panel comprises the display panel and the detection device of the display panel. Therefore, the display panel provided in the embodiment of the present application also has the beneficial effects described in the above embodiments, and details are not repeated herein.
Wherein the display panel includes display pixels and edge identification pixels 210; the display pixel includes a pixel driving circuit and a first light emitting element, an anode of the first light emitting element is connected to the pixel driving circuit, a cathode of the first light emitting element is connected to a first power signal line VSS, and the pixel driving circuit is connected to a reference signal line Vref; the edge recognition pixel 210 includes a second light emitting element EL whose anode is connected to the reference signal line Vref and whose cathode is connected to the first power supply signal line VSS. When the edge identification pixel 210 is driven to emit light, the reference voltage input by the reference signal line Vref is positive voltage; when the display pixels are driven to emit light, the reference voltage input by the reference signal line Vref is negative.
For the description of the specific position, structure, etc. of the display pixel and the edge identification pixel 210, reference may be made to the corresponding description in fig. 2 and fig. 3, and in order to avoid repetition, the description is not repeated here.
It should be noted that the display panel provided in the embodiment of the present invention may be an organic light emitting display panel. Illustratively, the display panel may be any product or component having a display function, such as a mobile phone, a tablet computer, a wearable device, a display, a notebook computer, and a navigator. And the inspection apparatus of the display panel may include an AOI device.
Referring to fig. 9, an embodiment of the present application further provides a detection apparatus 900, where the detection apparatus 900 may include: a memory 901, a processor 902 and a communication interface 903, wherein the memory 901, the processor 902 and the communication interface 903 can communicate; illustratively, the memory 901, the processor 902, and the communication interface 903 may communicate over a communication bus.
The memory 901 may be a Read Only Memory (ROM), a static memory device, a dynamic memory device, or a Random Access Memory (RAM). The memory 901 may store a computer program, which is controlled by the processor 902 to execute, and the communication interface 903 executes communication, so as to implement the detection method of the display panel provided by the above-mentioned embodiments of the present application.
The embodiment of the application also provides a computer readable storage medium. The methods described in the above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media may include computer storage media and communication media, and may include any medium that can communicate a computer program from one place to another. A storage medium may be any target medium that can be accessed by a computer.
In one possible implementation, the computer-readable medium may include RAM, ROM, a compact disk read-only memory (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes disc, laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be configured in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. In the description of the present application, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A detection method of a display panel, wherein the display panel comprises display pixels and edge identification pixels, the method comprising;
acquiring a first image displayed on the display panel while driving the edge recognition pixel to emit light;
identifying the first image by adopting an edge detection algorithm to determine a pixel boundary area of the display panel;
acquiring a second image displayed on the display panel when the display pixels are driven to emit light;
and determining whether the display panel has a display defect according to the pixel boundary area and the second image.
2. The method of claim 1, wherein determining whether the display panel has a display defect based on the pixel boundary region and the second image comprises:
detecting whether each display pixel in the pixel boundary area corresponding to the second image has a dark pixel which is not lightened or not;
and when dark point pixels which are not lightened exist, determining whether the display panel has display defects according to the distribution information of the dark point pixels.
3. The method according to claim 2, wherein the determining whether the display panel has the display defect according to the distribution information of the dark-point pixels comprises:
and when the plurality of dark point pixels are continuously distributed and the number of the plurality of dark point pixels which are continuously distributed is greater than or equal to a first preset number, determining that the display panel has poor dark lines.
4. The method according to claim 2, wherein the determining whether the display panel has the display defect according to the distribution information of the dark-point pixels comprises:
and when the plurality of dark point pixels are distributed in a dispersed manner and the number of the plurality of dark point pixels is greater than or equal to a second preset number, determining that the display panel has poor dark points.
5. The method according to claim 2, wherein the detecting whether each display pixel in the pixel boundary area corresponding to the second image has a dark pixel that is not lighted comprises:
acquiring a gray-scale value of each display pixel in the pixel boundary area corresponding to the second image;
when the gray scale value of the display pixel is smaller than or equal to a preset gray scale threshold value, determining that the display pixel is a dark pixel which is not lightened;
and when the gray-scale value of the display pixel is larger than the preset gray-scale threshold value, determining that the display pixel is a lighted normal pixel.
6. The method according to any one of claims 1 to 5, wherein the identifying the first image using an edge detection algorithm to determine a pixel boundary region of the display panel comprises:
identifying a convex hull point set in the first image by adopting a convex hull algorithm;
and sequentially connecting all convex hull points in the convex hull point set to form a minimum convex polygon as a pixel boundary area of the display panel.
7. The method of claim 6, wherein identifying the set of convex hull points in the first image using a convex hull algorithm comprises:
selecting one of the edge identification pixels from the first image as a starting convex package point; the initial convex hull point is an edge identification pixel with a maximum coordinate value or a minimum coordinate value in the first image along a target coordinate direction, and the target coordinate direction is an abscissa direction and/or an ordinate direction;
taking the initial convex hull point as a reference point, and screening a plurality of target convex hull points from the rest edge identification pixels outside the initial convex hull point according to a preset mode;
and taking the set of the starting convex hull point and the plurality of target convex hull points as the convex hull point set.
8. An apparatus for inspecting a display panel, the display panel including display pixels and edge recognition pixels, the apparatus comprising:
a first image acquisition module for acquiring a first image displayed on the display panel when the edge identification pixel is driven to emit light;
the pixel boundary detection module is used for identifying the first image by adopting an edge detection algorithm so as to determine a pixel boundary area of the display panel;
a second image acquisition module for acquiring a second image displayed on the display panel when the display pixels are driven to emit light;
and the display defect detection module is used for determining whether the display panel has display defects according to the pixel boundary area and the second image.
9. A display panel includes display pixels and edge identification pixels;
the display pixel comprises a pixel driving circuit and a first light-emitting element, wherein the anode of the first light-emitting element is connected with the pixel driving circuit, the cathode of the first light-emitting element is connected with a first power signal line, and the pixel driving circuit is connected with a reference signal line;
the edge recognition pixel includes a second light emitting element whose anode is connected to the reference signal line and whose cathode is connected to the first power supply signal line;
when the edge identification pixel is driven to emit light, the reference voltage input by the reference signal line is positive voltage; when the display pixels are driven to emit light, the reference voltage input by the reference signal line is negative voltage.
10. The display panel according to claim 9, comprising a display area and a non-display area, wherein the edge identification pixel is located at an edge of the display area;
preferably, the edge recognition pixels are located at corner positions of the display area.
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