AOI detection and AOI detection equipment for shielding display screen Mark

Abstract

The invention provides an AOI (Automatic Optic Inspection) detector and AOI detection equipment for shielding a Mark mark of a display screen. The to-be-tested display screen is placed on the jig and is not lightened; controlling a bottom plate light source to input voltage, acquiring an image by a camera, and segmenting a region of interest of the image; the display screen to be tested comprises a Mark mark; performing pixel area and contour information screening on the region of interest, and screening out a region of which the pixel area is close to Mark mark contour shape template information as a detected Mark mark region; and controlling the bottom plate light source to be the voltage for normal working of the display screen, lightening the display screen to carry out defect detection on different pictures, making a complementary set of the detected bad area and the Mark mark area, and if the complementary set is 0, judging that the display screen is an OK product. According to the method, the height detection rate of the Mark mark is realized by using a method of lighting and automatically adjusting the exposure time and the gain through a camera and an image processing algorithm, so that the position of the Mark mark is shielded, the misjudgment rate caused by Mark false capture is reduced, and the equipment detection capability and the algorithm compatibility are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display screen detection, and in particular to an AOI detection method for shielding a Mark on a display screen and an AOI detection device. Background Art

[0002] AOI (Automated Optical Inspection) is based on optical principles to detect common defects encountered in welding production. During automatic inspection, the machine automatically scans the PCB through a camera, collects images, compares the tested solder joints with qualified parameters in the database, and detects defects on the PCB through image processing. The defects are displayed / marked through a display or automatic marking for maintenance personnel to repair.

[0003] The LCD screen consists of an LCD screen and two polarizers, with different marks on the protective films of the upper and lower polarizers to distinguish the upper and lower sides of the screen. Due to the different and uneven ink colors and the position deviation of the printing plate during printing, the marks on the polarizer have different colors, depths, shapes, and positions. As a result, the AOI inspection equipment needs to develop different inspection algorithms for different display screen marks, so as to find the position of the mark first, set the area as the non-inspection area, and then conduct defect inspection for other areas. This leads to high development costs, complex procedures, and poor test results. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present application is to reduce the misjudgment rate caused by misgrasping of the Mark, and to improve the device detection capability and algorithm compatibility. The purpose of the embodiments of the present invention is to provide a method for automatically adjusting the exposure time and gain by using lighting and the camera, and to achieve a high detection rate of the Mark, thereby shielding the Mark position, reducing the misjudgment rate caused by misgrasping of the Mark, and improving the device detection capability and algorithm compatibility.

[0005] A first aspect of the present invention provides an AOI detection method for shielding a Mark on a display screen, the method comprising: The display screen to be tested is placed on the fixture without lighting it; the input voltage of the bottom plate light source is controlled to be Vout, the camera collects images, and the area of ​​interest of the image is segmented; the display screen to be tested includes a Mark; Screening the pixel area and contour information of the region of interest, and screening out the region with a pixel area close to the Mark outline template information as the Mark area to be detected; The baseboard light source is controlled to have a voltage sufficient for the normal operation of the display screen, and the display screen is lit to perform defect detection on different screens. The detected bad area is complemented with the Mark area, and the complement area is the defective area; if the complement is 0, the display screen is judged to be an OK product.

[0006] Furthermore, the control of the backplane light source input voltage to Vout, the camera collecting images, and segmenting the region of interest of the image includes the step of predetermining the light source input voltage Vout; The step of predetermining the light source input voltage Vout comprises: A good display screen is placed on the fixture, but the display screen does not power on. The light source controller controls the bottom plate light source, and the camera collects images in real time; while enhancing the light source intensity, the grayscale value of the image is calculated in real time; When the highest grayscale value of the image reaches a preset value, the backlight source stops being enhanced, and the input voltage Vout at this time is recorded.

[0007] Furthermore, the region of interest of the segmented image includes: The image is processed using Otsu algorithm and threshold segmentation algorithm to segment the region of interest.

[0008] Furthermore, the Mark outline template information includes pixel area and outline information; The pixel area and contour information of the region of interest are screened to select the region whose pixel area is close to the Mark contour template information, including: The area whose pixel area and contour information similarity in the interest area of ​​the display screen to be tested is close to the outline template information of the Mark mark is determined as the Mark mark area.

[0009] Furthermore, the method also includes the step of pre-extracting the Mark outline template information; The step of pre-extracting the Mark outline template information comprises: The good display screen is placed on the fixture, the input voltage of the bottom plate light source is controlled to be Vout, the camera collects the image, and the area of ​​interest of the image is segmented; According to the segmentation results of the region of interest, the two regions with the largest areas are selected and determined as the two Mark regions; Extract the contour information of the two Mark areas respectively and save them as contour templates Mark_ShapeModel_1 and Mark_ShapeModel_2; The morphological algorithm is used to calculate the geometric center coordinates of the two regions (x_mark_1, y_mark_1) and (x_mark_2, y_mark_2), and create regions of Mark outline template information, Mark_Region_1 and Mark_Region_2.

[0010] In order to solve the above technical problems, in a second aspect, the embodiment of the present application provides an AOI inspection device, which adopts the following technical solution: AOI inspection equipment includes a control and acquisition module, a screening module and a judgment module, among which: The control and acquisition module is used to place the display screen to be tested on the fixture without lighting it; control the input voltage of the bottom plate light source to be Vout, the camera to collect images, and segment the area of ​​interest of the image; the display screen to be tested includes a Mark; A screening module is used to screen the pixel area and contour information of the region of interest, and screen out the region with a pixel area close to the Mark outline template information as the Mark region to be detected; The judgment module is used to control the bottom plate light source to the voltage for normal operation of the display screen, light up the display screen to perform defect detection on different screens, and complement the detected bad area with the Mark area, and the complement area is the defective area; if the complement is 0, the display screen is judged to be an OK product.

[0011] Further, the control backplane light source input voltage is Vout, the camera collects the image, and the region of interest of the image is segmented, including a pre-determination module for pre-determining the light source input voltage Vout; The predetermined module is used to: A good display screen is placed on the fixture, but the display screen does not power on. The light source controller controls the bottom plate light source, and the camera collects images in real time; while enhancing the light source intensity, the grayscale value of the image is calculated in real time; When the highest grayscale value of the image reaches a preset value, the backlight source stops being enhanced, and the input voltage Vout at this time is recorded.

[0012] Furthermore, the Mark outline template information includes pixel area and outline information; The screening module also includes a module for determining the area in the interest area of ​​the display screen to be tested whose pixel area and contour information are similar to the Mark outline template information as the Mark area.

[0013] In addition, the third aspect of the present invention provides an electronic device, which includes: one or more processors, and a memory, wherein the memory is used to store one or more computer programs; the computer program is configured to be executed by the one or more processors, and the program includes steps for executing the AOI detection method for shielding the display screen Mark as described in the first aspect.

[0014] In addition, the fourth aspect of the present invention provides a storage medium storing a computer program; the program is loaded and executed by a processor to implement the steps of the AOI detection method for shielding the Mark of the display screen as described in the first aspect above.

[0015] In the scheme of the present invention, the display screen to be tested is placed on the fixture without lighting it; the input voltage of the bottom plate light source is controlled to be Vout, the camera collects images, and the area of ​​interest of the image is segmented; the display screen to be tested includes a Mark mark; the pixel area and contour information of the area of ​​interest are screened, and the area with a pixel area close to the outline template information of the Mark mark is screened as the area of ​​the Mark mark to be detected; the bottom plate light source is controlled to be the voltage of the normal operation of the display screen, the display screen is lit to perform defect detection of different pictures, and the detected bad area and the Mark mark area are complemented, and the complement area is the defect area; if the complement is 0, the display screen is judged to be an OK product. Compared with the prior art, the embodiment of the present application has the following beneficial effects: using the method of lighting and the camera automatically adjusting the exposure time and gain, plus the image processing algorithm, a high detection rate of the Mark mark is achieved, thereby shielding the Mark mark position, reducing the misjudgment rate caused by misgrasping the Mark, and improving the equipment detection capability and algorithm compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall hardware structure of the device structure disclosed in the embodiment of the present invention; Figure 2 It is a flow chart of an AOI detection method for shielding a Mark on a display screen disclosed in an embodiment of the present invention; Figure 3 It is a captured image disclosed in an embodiment of the present invention when the maximum grayscale value of the image is about 200; Figure 4It is a general schematic diagram of the Mark, display area and non-display area disclosed in the embodiment of the present invention; Figure 5 It is a schematic diagram of image segmentation results in a template creation process disclosed in an embodiment of the present invention.

[0018] The reference numerals in the figure are: 1. camera, 2. display screen, 3. bottom plate light source, 4. carrier, 5. lighting fixture, 6. Mark, 7. display area, 8. non-display area. DETAILED DESCRIPTION

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] It should be noted that the “plurality” mentioned in this article refers to two or more.

[0022] The implementation details of the technical solution of the embodiment of the present application are described in detail below: See also Figure 1 , Figure 1 The overall hardware structure diagram of the device structure of this embodiment is shown in FIG. In this embodiment, the device hardware structure includes: ① Camera 1: used to capture images on the display screen; ② Lighting fixture 5: used to locate the loading position of the display screen and light up the display screen; ③ Bottom plate light source 3: a plane light source with uniform brightness, used to control the intensity of the light source passing through the display screen, thereby controlling the brightness of the display screen; in addition, there is a carrier 4; ④Light source controller: used to control the working voltage of the baseboard light source; ⑤Communication circuit: used to control the output voltage of the light source controller to the light source, the switching of the display screen and the signal response between the computer; ⑥ Computer and display screen 2: used to run software algorithms, perform image detection processing, and display detection results.

[0023] In a first aspect of this embodiment, an AOI detection method for shielding Marks on a display screen is implemented.

[0024] See also Figure 2 , Figure 2 FIG. 1 is a flow chart of an AOI detection method for shielding a display screen Mark disclosed in an embodiment of the present invention. Figure 2 As shown, the AOI detection method of the Mark mark of the shielding display screen according to the embodiment of the present invention includes: S201, placing the display screen to be tested on the fixture without lighting it; controlling the input voltage of the bottom plate light source to be Vout, and the camera collecting images, and segmenting the region of interest of the image; the display screen to be tested includes a Mark; Before performing formal testing, this embodiment needs to implement template creation.

[0025] Specifically, a good display screen is placed on the fixture, and the display screen is not powered on. The light source controller controls the bottom plate light source, gradually increasing the light source intensity, and the camera collects images in real time. During this process, the contrast between the Mark on the image and the background will gradually increase, and then the algorithm is used to calculate the grayscale value of the image in real time. When the highest grayscale value of the image is around 200, the bottom plate light source stops increasing, and the input voltage Vout is recorded at this time. In the image collected by the camera at this time, the Mark has a higher contrast with the background. Figure 3 The image shown is a captured image of this embodiment when the maximum grayscale value of the image is around 200.

[0026] Different polarizer manufacturers will print different symbols or letters at different positions on the polarizer protective film to indicate whether the polarizer is an upper polarizer or a lower polarizer. Figure 4 As shown in FIG. 1 , it is a general schematic diagram of the Mark 6, the display area 7 and the non-display area 8 of this embodiment. Among them, "T" stands for "TOP" and represents the upper polarizer, and "B" stands for "bottom" and represents the lower polarizer. The Mark can have different colors or the same color. When the display screen displays a white picture, because the Mark blocks the backlight source from passing through the display screen, the Mark is dark relative to the white background of the display screen.

[0027] Further, the image is processed using the OTSU algorithm and the threshold segmentation algorithm ( Figure 3The image is segmented to find the region of interest. Since dust and wool may fall on the LCD screen when it is displayed, the images collected will have a high contrast between the Mark and the white background, and the dust and wool will also have a high contrast with the background. This will cause them to be extracted together during image processing and segmentation. Figure 5 The figure shows the image segmentation result schematic diagram of the template creation process in this embodiment, wherein the red area is the segmentation proposed area.

[0028] Furthermore, the method further comprises the step of pre-extracting the Mark outline template information; the Mark outline template information comprises pixel area and outline information; The step of pre-extracting the Mark outline template information comprises: The good display screen is placed on the fixture, the input voltage of the bottom plate light source is controlled to be Vout, the camera collects the image, and the area of ​​interest of the image is segmented; According to the segmentation results of the region of interest, the two regions with the largest areas are selected and determined as the two Mark regions; Extract the contour information of the two Mark areas respectively and save them as contour templates Mark_ShapeModel_1 and Mark_ShapeModel_2; The morphological algorithm is used to calculate the geometric center coordinates of the two regions (x_mark_1, y_mark_1) and (x_mark_2, y_mark_2), and create regions of Mark outline template information, Mark_Region_1 and Mark_Region_2.

[0029] Specifically, in this embodiment, the pixel area Area and contour information Shape of the Mark mark are extracted; because the Mark mark of the same model of display screen has a small change in the size of the pixel area occupied by the Mark mark during imaging, which is larger than the area of ​​other dust and wool, and the contour shape information of the Mark mark also changes very little. Therefore, the algorithm is used to screen out the two areas with the largest area, which are Mark_Area_1 and Mark_Area_2, that is, the areas of the two Mark marks, and then the contour shape information of the two Mark mark areas is extracted respectively (this algorithm is based on the halcon development platform, and the contour shape information template is created using the create_shape_model operator in the platform), and saved as contour templates Mark_ShapeModel_1 and Mark_ShapeModel_2. And the morphological algorithm (area_center) is used to calculate the geometric center coordinates (x_mark_1, y_mark_1) and (x_mark_2, y_mark_2) of the two areas respectively, and the areas Mark_Region_1 and Mark_Region_2 of the contour shape template information are created.

[0030] After extracting the Mark outline template information in advance, in this embodiment, step S201 is formally executed. Further, the control substrate light source input voltage is Vout, the camera collects images, and the region of interest of the image is segmented, including the step of predetermining the light source input voltage Vout; The step of predetermining the light source input voltage Vout comprises: A good display screen is placed on the fixture, but the display screen does not power on. The light source controller controls the bottom plate light source, and the camera collects images in real time; while enhancing the light source intensity, the grayscale value of the image is calculated in real time; When the highest grayscale value of the image reaches a preset value, the backlight source stops being enhanced, and the input voltage Vout at this time is recorded.

[0031] S202, filtering the pixel area and contour information of the region of interest, and filtering out the region with a pixel area close to the Mark outline template information as the Mark region to be detected; Furthermore, segmenting the region of interest of the image includes: processing the image using an Otsu algorithm and a threshold segmentation algorithm to segment the region of interest.

[0032] Among them, the pixel area and contour information of the region of interest are screened to screen out the region whose pixel area is close to the Mark outline template information, including: determining the region whose pixel area and contour information similarity is close to the Mark outline template information in the region of interest of the display screen to be tested as the Mark area.

[0033] Specifically, in this embodiment, during detection, the current test display screen is also displayed in white, the CCD captures the screen, and the image is processed using the Otsu algorithm and the threshold segmentation algorithm to segment the region of interest. Using the Mark_Area_1 and Mark_Area_2 information obtained above, the regions with areas between 0.9* Mark_Area_1 and 1.1* Mark_Area_1 and 0.9* Mark_Area_2 and 1.1* Mark_Area_2 are screened out. At this time, the number of regions screened out may be greater than 2, because if the display screen happens to have a black defect, its area size is about the same as the Mark size, and it will be screened out. Then, the contour template matching method (find_shape_model) is used to filter out the contour information similarity (minimum is 0 and maximum is 1) in the areas of 0.9* Mark_ShapeModel_1~ 1.1* Mark_ShapeModel_1 and 0.9* Mark_ShapeModel_2~1.1*Mark_ShapeModel_2. At this time, the filtered areas are the area positions Mark_Region_1' and Mark_Region_2' marked with two marks on the current test display.

[0034] S203, control the bottom panel light source to the voltage for normal operation of the display screen, light up the display screen to perform defect detection on different screens, and complement the detected bad area with the Mark area, the complement area is the defect area; if the complement is 0, the display screen is judged to be OK.

[0035] Specifically, in this embodiment, after the red area is extracted by the image algorithm threshold segmentation, when the display screen is tested on a white screen, the algorithm will capture the Mark area and the black line defect and point defect areas. The total is Regin_All, and the Mark area has been obtained by the above algorithm as Mark_Region_1' and Mark_Region_2'. Region_All is subtracted from Mark_Region_1 and Mark_Region_2, and the remaining difference area is the defect area. If the defect area is an empty set, it is determined that the display screen does not display defects on the white screen. The detection method for other screens is similar. Since the position of the Mark on the same test display screen remains unchanged relative to the position of the display screen, there is no need to obtain the position of the Mark in other screens. The area position of the Mark obtained by using the white screen is sufficient.

[0036] In order to solve the above technical problems, in a second aspect of this embodiment, an AOI inspection device is provided, which adopts the following technical solution: AOI inspection equipment includes a control and acquisition module, a screening module and a judgment module, among which: The control and acquisition module is used to place the display screen to be tested on the fixture without lighting it; control the input voltage of the bottom plate light source to be Vout, the camera to collect images, and segment the area of ​​interest of the image; the display screen to be tested includes a Mark; A screening module is used to screen the pixel area and contour information of the region of interest, and screen out the region with a pixel area close to the Mark outline template information as the Mark region to be detected; The judgment module is used to control the bottom plate light source to the voltage for normal operation of the display screen, light up the display screen to perform defect detection on different screens, and complement the detected bad area with the Mark area, and the complement area is the defective area; if the complement is 0, the display screen is judged to be an OK product.

[0037] Further, the control backplane light source input voltage is Vout, the camera collects the image, and the region of interest of the image is segmented, including a pre-determination module for pre-determining the light source input voltage Vout; The predetermined module is used to: A good display screen is placed on the fixture, but the display screen does not power on. The light source controller controls the bottom plate light source, and the camera collects images in real time; while enhancing the light source intensity, the grayscale value of the image is calculated in real time; When the highest grayscale value of the image reaches a preset value, the backlight source stops being enhanced, and the input voltage Vout at this time is recorded.

[0038] Furthermore, the Mark outline template information includes pixel area and outline information; The screening module also includes a module for determining the area in the interest area of ​​the display screen to be tested whose pixel area and contour information are similar to the Mark outline template information as the Mark area.

[0039] The segmenting of the region of interest of the image includes: processing the image by using the Otsu algorithm and the threshold segmentation algorithm to segment the region of interest.

[0040] The pre-determination module is also used to pre-extract the Mark outline template information; the pre-extraction of the Mark outline template information includes: The good display screen is placed on the fixture, the input voltage of the bottom plate light source is controlled to be Vout, the camera collects the image, and the area of ​​interest of the image is segmented; According to the segmentation results of the region of interest, the two regions with the largest areas are selected and determined as the two Mark regions; Extract the contour information of the two Mark areas respectively and save them as contour templates Mark_ShapeModel_1 and Mark_ShapeModel_2; The morphological algorithm is used to calculate the geometric center coordinates of the two regions (x_mark_1, y_mark_1) and (x_mark_2, y_mark_2), and create regions of Mark outline template information, Mark_Region_1 and Mark_Region_2.

[0041] In addition, an embodiment of the present application also discloses an electronic device, which includes: one or more processors, and a memory, wherein the memory is used to store one or more computer programs; characterized in that the computer program is configured to be executed by the one or more processors, and the program includes steps for executing the AOI detection method for shielding the display screen Mark as described in the first aspect above.

[0042] In addition, an embodiment of the present application further provides a storage medium storing a computer program; the program is loaded and executed by a processor to implement the steps of the AOI detection method for shielding a display screen Mark as described in the first aspect above.

[0043] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0044] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

[0045] The units described as separate components may or may not be physically separated. As a unit, it can be appreciated by those skilled in the art that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0046] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0047] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a grid device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0048] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An AOI detection method for shielding display screen Mark, characterized in that: The method comprises: The display screen to be tested is placed on the fixture without lighting it; the input voltage of the bottom plate light source is controlled to be Vout, the camera collects images, and the region of interest of the image is segmented; the display screen to be tested includes a Mark; The pixel area and contour information of the region of interest are screened to select the region with a pixel area close to The area of ​​the Mark outline template information is used as the Mark area for detection; The baseboard light source is controlled to have a voltage sufficient for the normal operation of the display screen, and the display screen is lit to perform defect detection on different screens. The detected bad area is complemented with the Mark area, and the complement area is the defective area; if the complement is 0, the display screen is judged to be an OK product.

2. The AOI detection method for shielding display screen Mark according to claim 1 is characterized in that: The control backplane light source input voltage is Vout, the camera collects images, and the image region of interest is segmented, including the step of predetermining the light source input voltage Vout; The step of predetermining the light source input voltage Vout comprises: A good display screen is placed on the fixture, but the display screen does not power on. The light source controller controls the bottom plate light source, and the camera collects images in real time; while enhancing the light source intensity, the grayscale value of the image is calculated in real time; When the highest grayscale value of the image reaches a preset value, the backlight source stops being enhanced, and the input voltage Vout at this time is recorded.

3. The AOI detection method for shielding display screen Mark according to claim 2 is characterized in that: The region of interest of the segmented image includes: The image is processed using Otsu algorithm and threshold segmentation algorithm to segment the region of interest.

4. The AOI detection method for shielding display screen Mark according to claim 3 is characterized in that: The Mark outline template information includes pixel area and outline information; The pixel area and contour information of the region of interest are screened to select the region whose pixel area is close to the Mark contour template information, including: The area whose pixel area and contour information similarity in the interest area of ​​the display screen to be tested is close to the outline template information of the Mark mark is determined as the Mark mark area.

5. The AOI detection method for shielding display screen Mark according to claim 4 is characterized in that: The method also includes the step of pre-extracting Mark outline template information; The step of pre-extracting the Mark outline template information comprises: The good display screen is placed on the fixture, the input voltage of the bottom plate light source is controlled to be Vout, the camera collects the image, and the area of ​​interest of the image is segmented; According to the segmentation results of the region of interest, the two regions with the largest areas are selected and determined as the two Mark regions; Extract the contour information of the two Mark areas respectively and save them as contour templates Mark_ShapeModel_1 and Mark_ShapeModel_2; The morphological algorithm is used to calculate the geometric center coordinates of the two regions (x_mark_1, y_mark_1) and (x_mark_2, y_mark_2), and create regions of Mark outline template information, Mark_Region_1 and Mark_Region_2.

6. An AOI inspection device, characterized in that: The device includes a control and acquisition module, a screening module and a judgment module, wherein: The control and acquisition module is used to place the display screen to be tested on the fixture without lighting it; control the input voltage of the bottom plate light source to be Vout, the camera to collect images, and segment the area of ​​interest of the image; the display screen to be tested includes a Mark; A screening module is used to screen the pixel area and contour information of the region of interest, and screen out the region with a pixel area close to the Mark outline template information as the Mark region to be detected; The judgment module is used to control the bottom plate light source to the voltage for normal operation of the display screen, light up the display screen to perform defect detection on different screens, and complement the detected bad area with the Mark area, and the complement area is the defective area; if the complement is 0, the display screen is judged to be an OK product.

7. The AOI inspection equipment according to claim 6, characterized in that: The control backplane light source input voltage is Vout, the camera collects images, and segments the region of interest of the image, including a pre-determination module for pre-determining the light source input voltage Vout; The predetermined module is used to: A good display screen is placed on the fixture, but the display screen does not power on. The light source controller controls the bottom plate light source, and the camera collects images in real time; while enhancing the light source intensity, the grayscale value of the image is calculated in real time; When the highest grayscale value of the image reaches a preset value, the backlight source stops being enhanced, and the input voltage Vout at this time is recorded.

8. The AOI inspection equipment according to claim 7, characterized in that: The Mark outline template information includes pixel area and outline information; The screening module also includes a module for determining the area in the interest area of ​​the display screen to be tested whose pixel area and contour information are similar to the Mark outline template information as the Mark area.

9. An electronic device, comprising: One or more processors, a memory, wherein the memory is used to store one or more computer programs; characterized in that the computer program is configured to be executed by the one or more processors, and the program includes steps for executing the AOI detection method for shielding display screen Mark as described in any one of claims 1-5.

10. A storage medium storing a computer program; the program is loaded and executed by a processor to implement the steps of the AOI detection method for shielding a Mark on a display screen as described in any one of claims 1 to 5.

Images