CN112285118A - AMOLED screen appearance visual detection method and device - Google Patents
AMOLED screen appearance visual detection method and device Download PDFInfo
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- CN112285118A CN112285118A CN202011137542.5A CN202011137542A CN112285118A CN 112285118 A CN112285118 A CN 112285118A CN 202011137542 A CN202011137542 A CN 202011137542A CN 112285118 A CN112285118 A CN 112285118A
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- 229920001621 AMOLED Polymers 0.000 title claims abstract description 72
- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 230000000007 visual effect Effects 0.000 title claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000007547 defect Effects 0.000 claims description 20
- 238000003384 imaging method Methods 0.000 claims description 17
- 238000010191 image analysis Methods 0.000 claims description 15
- 238000011179 visual inspection Methods 0.000 claims description 12
- 238000005498 polishing Methods 0.000 claims description 10
- 238000007405 data analysis Methods 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 208000003464 asthenopia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/94—Investigating contamination, e.g. dust
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to an AMOLED screen appearance visual detection method and device. The method comprises the following steps: s1, selecting a light-color carrying platform, and placing an AMOLED screen body to be detected on the light-color carrying platform; s2, stroboscopic light sources are respectively fixed above the side of the AMOLED screen body to be detected and respectively irradiate the AMOLED screen body to be detected at a high angle and a low angle; s3, installing a linear array camera in the direction of the reflected light of the stroboscopic light source, and receiving high-angle and low-angle reflected light images by the linear array camera; s4, acquiring an image by the linear array camera; s5, analyzing and processing the image to obtain a data processing result; and S6, judging whether the detection requirements are met or not according to the data processing result, if not, further finely adjusting the angle of the stroboscopic light source, and optimizing the lighting scheme until the detection algorithm requirements are met. The invention improves the accuracy of appearance detection, and simultaneously, a plurality of photos can be processed in parallel, thereby improving the detection speed.
Description
Technical Field
The invention relates to the field of appearance detection, in particular to an AMOLED screen appearance visual detection method and device.
Background
For panel display, especially in the manufacturing industry of AMOLED flat panel display, because the product has more production process flows and complex manufacturing links, certain defects such as scratches, concave and convex points, dirt, damage and the like cannot be avoided in the production process, and the appearance defects of the screen body not only affect the appearance of the product, but also may affect the performance of the screen body, so that the appearance of the screen body must be detected, and good products are selected to flow into the module process section, thereby saving the cost and providing a basis for process improvement. At present, most of appearance detection is performed through a manual inspection mode, which easily causes visual fatigue and causes misjudgment, and the inspection speed is low, so that the production efficiency is affected, but because the appearance detection equipment based on machine vision starts to enter, due to the particularity of the AMELD screen body structure, for example, an AA area and a non-AA area exist, and the material characteristics and microstructures of different areas are different, the detection is difficult to achieve at present in one detection link, so that the visual detection equipment cannot simultaneously meet the detection requirements of each project.
Disclosure of Invention
The invention provides an AMOLED screen appearance visual detection method and device aiming at solving the problems of low speed and low efficiency of the existing screen detection mode.
The invention provides an AMOLED screen appearance visual detection method, which comprises the following main steps:
s1, selecting a light-color carrying platform, and placing an AMOLED screen body to be detected on the light-color carrying platform;
s2, more than two stroboscopic light sources are respectively fixed above the side of the AMOLED screen body to be detected and respectively irradiate the AMOLED screen body to be detected at a high angle and a low angle;
s3, installing a linear array camera in the direction of the reflected light of the stroboscopic light source, and receiving high-angle and low-angle reflected light for imaging by the linear array camera;
s4, performing time division acquisition on the image by using the linear array camera according to a stroboscopic time sequence of the stroboscopic light source;
s5, analyzing and processing the image to obtain a data processing result;
and S6, judging whether the requirements that the AMOLED screen body to be detected can carry out defect detection in different areas are met or not according to the data processing result, if not, further finely adjusting the angle of the stroboscopic light source, and optimizing the polishing scheme until the requirements of a detection algorithm are met.
As a further improvement of the invention, in the step S1, the selection standard of the light-color carrier is that the image of the edge circuit area of the AMOLED screen to be detected is clear.
As a further improvement of the present invention, the step S3 specifically includes:
s31, mounting a linear array camera near the direction of the reflected light of the high-angle stroboscopic light source, wherein the mounting angle of the linear array camera is based on the fact that the reflected light of the high-angle stroboscopic light source is received and the brightest light is avoided being received;
and S32, the installation angle of the low-angle stroboscopic light source is based on that the reflected light received by the linear array camera reaches the brightest.
As a further improvement of the present invention, the step S4 specifically includes: the high-angle and low-angle stroboscopic light sources are subjected to cross flashing at a set frequency, and the light source controller controls the linear array camera to alternately and uninterruptedly acquire images in a time period when the two stroboscopic light sources illuminate the AMOLED screen body to be detected, so that an image with alternate light and shade is obtained.
As a further improvement of the present invention, the step S5 includes:
s51, acquiring images with alternate light and shade according to a linear array camera, and splitting a picture into a bright field image and a dark field image through image processing;
and S52, respectively carrying out image reconstruction, binarization processing, feature extraction and data analysis on the two images, and finally outputting a data processing result.
The invention also provides an AMOLED screen appearance visual detection device, which comprises a polishing module, a line scanning imaging module and an image analysis processing module, wherein the polishing module is used for emitting and reflecting a light source, the line scanning imaging module is used for acquiring images, the image analysis processing module is used for analyzing and processing the images and obtaining a data processing result, the polishing module comprises a first stroboscopic light source, a second stroboscopic light source and a light-color carrying platform for placing the AMOLED screen to be detected, the line scanning imaging module comprises a linear array camera, the first stroboscopic light source and the second stroboscopic light source are respectively fixed above the side of the AMOLED screen to be detected at a high angle and a low angle, the linear array camera is arranged in the direction of the reflected light of the first stroboscopic light source and the second stroboscopic light source, and the linear array camera and.
As a further improvement of the invention, the first stroboscopic light source irradiates on the AMOLED screen body to be detected at a high angle, the line camera is arranged in the direction of the reflected light of the first stroboscopic light source and avoids receiving the brightest light, the second stroboscopic light source irradiates on the AMOLED screen body to be detected at a low angle, and the angle of the second stroboscopic light source is based on that the reflected light received by the line camera reaches the brightest.
As a further improvement of the present invention, the lighting module includes a light source controller, one end of the light source controller is connected to and controls the first stroboscopic light source and the second stroboscopic light source, and the other end of the light source controller is connected to the image analysis processing module.
As a further improvement of the invention, the linear scanning imaging module comprises a zoom lens and a mechanical platform which moves stably, the zoom lens is connected to a shooting head of the linear array camera, and the linear array camera is fixed on the mechanical platform.
As a further improvement of the present invention, the light-color stage is used for placing a fast moving object to be detected, the first stroboscopic light source and the second stroboscopic light source respectively irradiate an area on a moving path of the object, and the linear array camera receives reflected light rays of the area reflected by the first stroboscopic light source and the second stroboscopic light source.
The invention has the beneficial effects that: the high-angle stroboscopic light source and the low-angle stroboscopic light source are synchronously utilized, and the linear array camera moves once to obtain two high-angle images and two low-angle images, so that the efficiency is improved, and the cost is reduced; the defects of the surface of the AMOLED screen body with the concave-convex feeling of the high-angle picture are easy to detect, the influence of the defects of the surface of the AMOLED screen body such as tiny scratches and dirt is weakened, the defects of the edge of the AMOLED screen body at a low angle are easy to detect, and automatic visual detection is conducted on the light emitting area and the connection pin area of the AMOLED screen body conveniently. The accuracy of appearance detection is improved, and two photos can be processed in parallel, so that the detection speed is improved.
Drawings
FIG. 1 is a flow chart of a visual inspection method for the appearance of an AMOLED screen according to the present invention;
FIG. 2 is a schematic structural diagram of an AMOLED screen appearance visual inspection device according to the present invention;
FIG. 3 is a comparison of a light background and a dark background during the detection process of the present invention;
FIG. 4 is a schematic diagram of the detection of appearance defects and the detection of an algorithm in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
The first embodiment is as follows:
as shown in fig. 1 and fig. 2, the method and the device for visual inspection of an appearance of an AMOLED screen body according to the present invention ensure the speed and accuracy of the appearance inspection by combining the high and low angles of the light source and the image analysis processing module, and are mainly used for AOI inspection of the appearance of the AMOLED screen.
The specific flow of the visual detection method comprises the following steps:
s1, selecting a light-colored carrying platform 4, and placing an AMOLED screen body 3 to be detected on the light-colored carrying platform 4;
s2, more than two stroboscopic light sources are respectively fixed above the side of the AMOLED screen body 3 to be detected and respectively irradiate the AMOLED screen body 3 to be detected at a high angle and a low angle;
s3, installing a linear array camera 5 in the direction of the reflected light of the stroboscopic light source, and receiving high-angle and low-angle reflected light images by the linear array camera 5;
s4, acquiring an image by using a linear array camera 5 according to a stroboscopic time sequence of a stroboscopic light source;
s5, analyzing and processing the image to obtain a data processing result;
and S6, judging whether the requirements that the AMOLED screen body 3 to be detected can carry out defect detection in different areas are met or not according to the data processing result, if not, further finely adjusting the angle of the stroboscopic light source, and optimizing the lighting scheme until the requirements of a detection algorithm are met.
By utilizing the high-angle stroboscopic light source and the low-angle stroboscopic light source, two high-angle photos and two low-angle photos can be shot respectively in one movement, which is equivalent to the fact that two cameras respectively shoot the high angle photos and the low angle photos, so that the efficiency is improved, and the cost is reduced; defects with concave-convex feeling on the surface of the AMOLED screen are easy to detect through high-angle irradiation, meanwhile, the defects such as tiny scratches, dirt and the like on the surface of the AMOLED screen can be weakened, and the defects on the edge of the AMOLED screen are easy to detect through low-angle irradiation.
In the step S1, the selection standard of the light-color carrier 4 is that the image of the edge circuit area of the AMOLED screen body 3 to be detected is clear. The microscope carrier selects light color background, ensures that the appearance edge line area can be clearly imaged, and avoids misjudgment.
Wherein, step S3 specifically includes:
s31, installing a linear array camera 5 near the direction of the reflected light of the high-angle stroboscopic light source, wherein the installation angle of the linear array camera 5 is based on the fact that the reflected light of the high-angle stroboscopic light source is received and the brightest light is avoided being received;
the linear array camera 5 is arranged near the direction of the reflected light of the high-angle light source, and the linear array camera 5 receives light at a certain angle to prevent the linear array camera 5 from receiving the brightest light to influence imaging; the image acquired at a high angle can highlight flaws with concave-convex feeling, and the influence of flaws such as dirt and micro scratches on the surface of the AMOLED screen is weakened.
S32, the installation angle of the low-angle stroboscopic light source is based on the condition that the reflected light rays received by the linear array camera 5 reach the brightest value; when light reaches brightest, the linear array camera 5 can acquire a clearer image of the edge of an object, can highlight flaws at the edge of the AMOLED screen body 3 to be detected, and is greatly convenient for carrying out automatic visual detection on a light emitting area and a connection pin area of the AMOLED screen body 3 to be detected.
As shown in fig. 3, step S4 specifically includes: the high-angle and low-angle stroboscopic light sources are subjected to cross flashing at a set frequency, the light source controller 6 controls the linear array camera 5 to alternately and uninterruptedly acquire images in a time period when the two stroboscopic light sources illuminate the AMOLED screen body 3 to be detected, and a light and dark image is obtained. The high-angle and low-angle stroboscopic light source cross-flashing ensures that the linear array camera 5 respectively collects the photos of the high-angle and low-angle stroboscopic light sources, and avoids the phenomenon that the light source images at two angles are overlapped to influence the resolution of the images.
As shown in fig. 4, step S5 includes:
s51, acquiring images with alternate light and shade according to the linear array camera 5, and splitting a picture into a bright field image and a dark field image through image processing; the image is divided into a bright field image and a dark field image, so that defects on the surface of the AMOLED screen body 3 to be detected and defects on the edge of the AMOLED screen body 3 to be detected can be distinguished in a targeted manner;
and S52, respectively carrying out image reconstruction, binarization processing, feature extraction and data analysis on the two images, and finally outputting a data processing result. After the system is used for processing, the defects of the object to be detected are more prominently displayed, and the post-processing is convenient.
Example two:
as shown in fig. 2, the visual inspection device for the AMOLED screen appearance comprises a lighting module for emitting and reflecting a light source, a line scan imaging module for acquiring an image, and an image analysis processing module 1 for analyzing and processing the image and obtaining a data processing result, wherein the lighting module comprises a first stroboscopic light source 21, a second stroboscopic light source 22, and a light-color carrier 4 for placing the AMOLED screen 3 to be inspected, the line scan imaging module comprises a linear array camera 5, the first stroboscopic light source 21 and the second stroboscopic light source 22 are respectively fixed above the side of the AMOLED screen 3 to be inspected at a high angle and a low angle, the linear array camera 5 is arranged in the direction of the reflected light of the first stroboscopic light source 21 and the second stroboscopic light source 22, and the linear array camera 5 and the light-color carrier 4 are respectively connected and transmit data to the image analysis processing module 1.
The image analysis processing module 1 comprises a PC end for carrying out reconstruction, binarization processing, feature extraction and data analysis on the image, and the linear array camera 5, the light-color carrier 4 and the light source controller 6 are respectively connected with and output data to the PC end. The PC end is used as a central pivot for data transmission, collects data and images of the polishing module and the line scanning imaging module and calculates a detection image.
The first stroboscopic light source 21 irradiates on the AMOLED screen body 3 to be detected at a high angle, the linear array camera 5 is arranged in the direction of the reflected light of the first stroboscopic light source 21 and avoids receiving the brightest light, the second stroboscopic light source 22 irradiates on the AMOLED screen body 3 to be detected at a low angle, and the angle set by the second stroboscopic light source 22 is based on the condition that the reflected light received by the linear array camera 5 reaches the brightest light. When the linear array camera 5 is arranged, the brightest light reflected by the first stroboscopic light source 21 is avoided, and the imaging is prevented from being influenced; after the linear array camera 5 is fixed, the setting angle of the second stroboscopic light source 22 is set according to the position of the linear array camera 5, so that the linear array camera 5 can receive the reflected light of the first stroboscopic light source 21 and can receive the brightest light of the second stroboscopic light source 22 at the same time, and the flaws on the edge of the object to be detected can be clearly presented.
The lighting module comprises a light source controller 6, one end of the light source controller 6 is respectively connected with and controls a first stroboscopic light source 21 and a second stroboscopic light source 22, and the other end of the light source controller 6 is connected with the image analysis processing module 1. The light source controller 6 controls the cross flashing of the first stroboscopic light source 21 and the second stroboscopic light source 22, and simultaneously transmits the flashing data of the first stroboscopic light source 21 and the second stroboscopic light source 22 to the image analysis processing module 1, and the image analysis processing module 1 controls the linear array camera 5 to shoot and collect images.
The linear scanning imaging module comprises a zoom lens 7 and a mechanical platform which moves stably, the zoom lens 7 is connected to a shooting head of the linear array camera 5, and the linear array camera 5 is fixed on the mechanical platform. The linear scanning imaging system adopts a 16K linear camera, a zoom lens 7 and a mechanical platform which moves stably, wherein the linear camera 5 can obtain higher resolution, and pixels in the vertical direction are not fixed and can be used for screens with various sizes; the mechanical platform moving stably can prevent image defects caused by shaking and reduce over-detection and missing detection when the image is subjected to algorithm processing.
The light color microscope stage 4 is used for placing a fast moving object to be detected, the first stroboscopic light source 21 and the second stroboscopic light source 22 respectively irradiate an area on the moving path of the object, and the linear array camera 5 receives the reflected light rays of the area reflected by the first stroboscopic light source 21 and the second stroboscopic light source 22. The stroboscopic light source can be used for detecting a fast moving object, and two photos can be shot at one time by using a high angle and a low angle, so that the defects with concave-convex feeling on the surface can be easily detected by the high angle, and the edge defects can be easily detected by the low angle; the line camera 5 can obtain images higher than that of a general industrial camera; the color of the carrier is light, and the edge appearance of the AMOLED screen body 3 to be detected is easy to detect; the image analysis processing module 1 utilizes simple image reconstruction, binarization, feature extraction and data analysis to quickly obtain algorithm detection.
The invention has the following advantages:
(1) according to the invention, two stroboscopic light sources are adopted, two high-angle and low-angle pictures can be shot through one-time movement, which is equivalent to the simultaneous movement of two cameras, so that the detection speed is improved, and the cost is saved;
(2) according to the invention, the defects with concave-convex feeling can be highlighted in the image acquired at a high angle, and the influence of the defects such as dirt and micro scratches on the surface of the AMOLED screen is weakened;
(3) the image acquired at a low angle can highlight flaws on the edge of the AMOLED screen body, and automatic visual detection of a light emitting area and a connection pin area of the AMOLED screen body is greatly facilitated;
(4) according to the invention, the light-color background is selected for the carrying platform, so that the appearance edge line area can be clearly imaged, and the misjudgment is avoided;
(5) by utilizing the polishing scheme combining high and low angles, the accuracy of appearance detection can be improved.
(6) The image analysis processing module of the invention adopts simple image reconstruction, binaryzation, feature extraction and data analysis to quickly obtain algorithm detection, and two pictures can be processed in parallel, thereby improving the detection speed.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the present invention pertains, without departing from the spirit of the present invention, several simple deductions or replacements can be made, such as increasing the number of the stroboscopic light source and the line-scan camera, and arranging them in different directions, and implementing different combinations of the synchronous photographing between the light source and the camera, which should be considered as falling into the protection scope of the present invention.
Claims (10)
1. The AMOLED screen appearance visual detection method is characterized by comprising the following steps:
s1, selecting a light-color carrying platform, and placing an AMOLED screen body to be detected on the light-color carrying platform;
s2, more than two stroboscopic light sources are respectively fixed above the side of the AMOLED screen body to be detected and respectively irradiate the AMOLED screen body to be detected at a high angle and a low angle;
s3, installing a linear array camera in the direction of the reflected light of the stroboscopic light source, and receiving high-angle and low-angle reflected light for imaging by the linear array camera;
s4, performing time division acquisition on the image by using the linear array camera according to a stroboscopic time sequence of the stroboscopic light source;
s5, analyzing and processing the image to obtain a data processing result;
and S6, judging whether the requirements that the AMOLED screen body to be detected can carry out defect detection in different areas are met or not according to the data processing result, if not, further finely adjusting the angle of the stroboscopic light source, and optimizing the polishing scheme until the requirements of a detection algorithm are met.
2. The AMOLED screen appearance visual inspection method of claim 1, wherein in the step S1, the light color carrier is selected according to a standard that an image of an edge circuit area of the AMOLED screen to be inspected is clear.
3. The AMOLED screen appearance visual inspection method of claim 1, wherein the step S3 specifically comprises:
s31, mounting a linear array camera near the direction of the reflected light of the high-angle stroboscopic light source, wherein the mounting angle of the linear array camera is based on the fact that the reflected light of the high-angle stroboscopic light source is received and the brightest light is avoided being received;
and S32, the installation angle of the low-angle stroboscopic light source is based on that the reflected light received by the linear array camera reaches the brightest.
4. The AMOLED screen appearance visual inspection method of claim 1, wherein the step S4 specifically comprises: the high-angle and low-angle stroboscopic light sources are subjected to cross flashing at a set frequency, and the light source controller controls the linear array camera to alternately and uninterruptedly acquire images in a time period when the two stroboscopic light sources illuminate the AMOLED screen body to be detected, so that an image with alternate light and shade is obtained.
5. The AMOLED screen appearance visual inspection method of claim 4, wherein the step S5 includes:
s51, acquiring images with alternate light and shade according to a linear array camera, and splitting a picture into a bright field image and a dark field image through image processing;
and S52, respectively carrying out image reconstruction, binarization processing, feature extraction and data analysis on the two images, and finally outputting a data processing result.
6. The AMOLED screen appearance visual detection device is characterized by comprising a polishing module, a line scanning imaging module and an image analysis processing module, wherein the polishing module is used for emitting and reflecting a light source, the line scanning imaging module is used for acquiring images, the image analysis processing module is used for analyzing and processing the images and obtaining a data processing result, the polishing module comprises a first stroboscopic light source, a second stroboscopic light source and a light-color carrying platform for placing an AMOLED screen to be detected, the line scanning imaging module comprises a linear array camera, the first stroboscopic light source and the second stroboscopic light source are respectively fixed above the side of the AMOLED screen to be detected at a high angle and a low angle, the linear array camera is arranged in the direction of the reflected light of the first stroboscopic light source and the second stroboscopic light source, and the linear array camera and the light-color.
7. The AMOLED screen body appearance visual inspection device according to claim 6, wherein the first stroboscopic light source irradiates on the AMOLED screen body to be inspected at a high angle, the line camera is arranged in the direction of reflected light rays of the first stroboscopic light source and avoids receiving brightest light, the second stroboscopic light source irradiates on the AMOLED screen body to be inspected at a low angle, and the angle of the second stroboscopic light source is set based on that the reflected light rays received by the line camera reach brightest.
8. The AMOLED screen appearance visual inspection device of claim 6, wherein the lighting module comprises a light source controller, one end of the light source controller is connected with and controls the first stroboscopic light source and the second stroboscopic light source respectively, and the other end of the light source controller is connected with the image analysis processing module.
9. The AMOLED screen appearance visual inspection device of claim 6, wherein the line scan imaging module comprises a zoom lens and a mechanical platform which moves stably, the zoom lens is connected to a camera of a line camera, and the line camera is fixed on the mechanical platform.
10. The AMOLED screen appearance visual inspection device of claim 6, wherein the light-color stage is used for placing a fast moving object to be inspected, the first stroboscopic light source and the second stroboscopic light source respectively irradiate an area on a moving path of the object, and the line camera receives reflected light rays of the area reflected by the first stroboscopic light source and the second stroboscopic light source.
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