CN112345546A - Mobile phone screen defect detection device and detection method - Google Patents
Mobile phone screen defect detection device and detection method Download PDFInfo
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- CN112345546A CN112345546A CN202011357765.2A CN202011357765A CN112345546A CN 112345546 A CN112345546 A CN 112345546A CN 202011357765 A CN202011357765 A CN 202011357765A CN 112345546 A CN112345546 A CN 112345546A
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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
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/896—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod
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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
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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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
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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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
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
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Abstract
The invention discloses a device and a method for detecting defects of a mobile phone screen, which can quickly realize the detection of the defects of the mobile phone screen by adopting a backlight LED light source and a matched defect identification algorithm which are specially designed by the invention. Specifically, the lamp beads are selected to be red light LEDs, green light LEDs, blue light LEDs and white light LEDs which are uniformly mixed and arranged to form a planar light source or a hemispherical shadowless light source, and the brightness of the LEDs with different light colors is controlled independently. When the planar light source is used, a workpiece to be detected is placed on the hollow support frame and is conveyed to the position above the light source through the transparent conveying belt, different colored light is respectively lightened and photographed, the obtained 4 images are subjected to pixel-by-pixel point contrast analysis, and points with large differences are defect points.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a device and a method for detecting defects of a mobile phone screen.
Background
The mobile phone screen defect detection is an important part in the mobile phone production process, especially, the mobile phone screen defect has a great influence on the experience of consumers, and all manufacturers pay great attention to the mobile phone screen defect detection. At present, manual spot inspection is mainly used for completing the defect detection, the detection accuracy and the detection efficiency are different, the assembly line beat and the production schedule scheduling are greatly influenced, defective products enter the next procedure, and the defect detection automation is a problem which needs to be solved urgently.
Disclosure of Invention
Aiming at the existing problems, the invention provides a simple and effective defect detection method and device which overcome the defects in the prior art, and the method and the device have high detection accuracy and high speed.
The technical solution of the invention is as follows: the invention provides a mobile phone screen defect detection device, which comprises a workpiece support frame, a specially-made light source module, a transmission module, a proximity switch sensor, an imaging module and a software module, wherein the specially-made light source module is a planar light source or a hemispherical shadowless light source, the transmission module comprises a transmission belt and a connecting bridge for connecting a previous process, the connecting bridge is arranged at one end of the transmission belt, the proximity switch sensor is arranged above the transmission belt, the imaging module comprises a camera and a lens, the workpiece support frame enters the transmission belt from the previous process through the connecting bridge, the specially-made light source module, the transmission module, the proximity switch sensor, the imaging module and the software module are electrically connected, when the planar light source is adopted, the light source is arranged below the transmission belt, a light emitting surface is upward, when the hemispherical shadowless light source is adopted, the light source is arranged at the front end (below) of the lens, the light emitting surface faces downward.
The invention is further improved in that: the workpiece support frame is a hollow side groove support structure and is used for supporting a mobile phone screen workpiece.
The invention is further improved in that: the frosted glass which plays a role in protection and light equalization is arranged on the surface of the plane light source, and the diffuse reflection backlight light source is obtained based on the frosted glass.
The invention is further improved in that: the planar light source is formed by uniformly mixing and arranging red LEDs, green LEDs, blue LEDs and white LEDs, and the LEDs with different light colors are independently controlled to be bright and dark.
The invention is further improved in that: the hemisphere shadowless light source comprises a hemisphere shell, wherein a light barrier for mixing the LED lamp beads 10 with the hemisphere shadowless light source is arranged in the hemisphere shell, an opening is formed in the top of the hemisphere shell, a camera lens can conveniently penetrate through the opening to take pictures, and LEDs with different light colors are independently controlled to be bright and dark.
The invention is further improved in that: the lamp beads of the hemispherical shadowless light source are red light LEDs, green light LEDs, blue light LEDs and white light LEDs which are uniformly mixed, the hemispherical shadowless light source is arranged on the periphery of the inner side of a hemispherical tangent plane, a light emitting surface irradiates the inner surface of a hemisphere, and white matte paint is coated on the inner surface of the hemisphere to play a role in diffuse reflection.
The invention is further improved in that: when a plane light source is adopted, the transmission band of the transmission module is made of transparent or semitransparent materials.
The invention is further improved in that: the proximity switch sensor is arranged above the conveying belt and close to one side of the camera and the incoming material of the conveying belt, is used for sensing the arrival of a workpiece and delaying the triggering of the camera to take a picture, and the delay time is determined by experiments so as to ensure that the workpiece is positioned in the center of an image during the picture taking.
The invention also provides a detection method of the mobile phone screen defect detection device, which comprises the following specific steps that firstly, a workpiece support frame and a sample enter a conveying belt through a connecting bridge from the previous process, then, when a proximity switch senses that the workpiece support frame and the sample reach the lower part of the workpiece support frame and the sample, delayed photographing is triggered, the LED with certain color light is sequentially turned on and photographed in the photographing process, namely, the photographing is carried out for 4 times, the photographing conditions respectively correspond to different single color light, after the photographing is finished, the photographing is uploaded to a software module, image analysis is carried out, whether the sample is defective or not is judged, and the non-defective sample enters the next process.
The invention is further improved in that: the software module mainly realizes the following algorithm:
1) controlling to respectively light different color lights and taking a picture by using a color camera;
2) analyzing the 4 shot images point by point according to pixel values, wherein if one of the 4 pixel values at the same position in the 4 images is obviously different from the other 3 pixel values, the 4 images are potential defects;
3) counting the size of the potential defect area and the size of the phase difference value;
4) and respectively comparing the size of the potential defect area and the size of the phase difference value with the set corresponding threshold value to judge whether the defect exists.
According to the mobile phone screen defect detection method and device provided by the invention, the backlight LED light source specially designed by the invention and the matched defect identification algorithm can be adopted to quickly realize mobile phone screen defect detection. Specifically, the lamp beads are selected to be red light LEDs, green light LEDs, blue light LEDs and white light LEDs which are uniformly mixed and arranged to form a planar light source or a hemispherical shadowless light source, and the brightness of the LEDs with different light colors is controlled independently. When the planar light source is used, a workpiece to be detected is placed on the hollow support frame and is conveyed to the position above the light source through the transparent conveying belt, different colored light is respectively lightened and photographed, the obtained 4 images are subjected to pixel-by-pixel point contrast analysis, and points with large differences are defect points.
The invention has the outstanding characteristics that: the invention designs a special light source and a matched defect detection algorithm aiming at the defect detection requirement of the mobile phone screen, the matched detection device is simple and effective, the detection algorithm only designs integer comparison operation, and the algorithm speed is extremely high.
Drawings
FIG. 1 is embodiment 1 of the present invention;
FIG. 2 is embodiment 2 of the present invention;
FIG. 3 is a hemispherical shadowless light source;
the device comprises a camera 1, a lens 2, a plane light source 3-1, a hemispherical shadowless light source 3-2, a proximity switch sensor 4, a workpiece support frame and a sample 5, a connecting bridge 6, a transmission belt 7, an opening 8 of the hemispherical shadowless light source, a hemispherical shell 9 of the hemispherical shadowless light source, a mixed LED lamp bead 10 of the hemispherical shadowless light source and a light barrier 11 of the hemispherical shadowless light source.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
The embodiment provides a mobile phone screen defect detection device, including imaging module, purpose-built light source module, transmission module, proximity switch sensor 4, work piece support frame 5 and software module, imaging module includes camera 1 and camera lens 2, purpose-built light source module is planar light source 3-1 or hemisphere shadowless light source 3-2, transmission module includes transmission band 7 and the connecting bridge 6 of connecting the preceding process, connecting bridge 6 sets up the one end of transmission band, proximity switch sensor 4 arranges and is close to camera 1 and transmission band 7 incoming material one side in the transmission band 7 top for the response work piece arrives and postpones the trigger camera and shoot, and the delay time is confirmed by the experiment, is in the image center when guaranteeing to shoot the work piece. The workpiece support frame 5 is a hollow side groove support structure, the size is based on conveniently supporting a mobile phone screen workpiece and conveniently taking a picture, the workpiece support frame 5 enters a transmission belt through a connecting bridge 6 from the previous process, the specially-made light source module, the transmission module, the proximity switch sensor 4 and the imaging module are electrically connected with the software module, when a planar light source 3-1 is adopted, the light source is arranged below the transmission belt 7, the light emitting surface is upward, frosted glass for protecting and homogenizing light is arranged on the surface of the planar light source, a diffuse reflection backlight light source is obtained based on the frosted glass, the planar light source 3-1 adopts red light LEDs, green light LEDs, blue light LEDs and white light LEDs for uniform mixing arrangement to construct the light source, the LEDs with different light colors are independently controlled to be bright and dark, when the planar light source 3-1 is adopted, the transmission belt of the transmission module is made of transparent or semitransparent materials, preferably made of transparent plastics, and has a light homogenizing effect with frosted glass on the surface of a light source, and the light transmittances of the transmission belt and the frosted glass are comprehensively considered in actual selection; when adopting hemisphere shadowless light source 3-2, the light source is arranged at 2 front ends of camera lens (below), and the luminescent surface is down, as shown in fig. 3, hemisphere shadowless light source 3-2 includes hemisphere casing 9, be equipped with mixed LED lamp pearl 10 and hemisphere shadowless light source's barn door 11 in hemisphere casing 9, mixed LED lamp pearl 10 is arranged for 4 kinds of LED lamp pearl homogeneous mixing ring circumferences, the top of hemisphere casing 9 is opened has the opening 8 that slightly is greater than camera lens 2, makes things convenient for the camera lens to see through the opening is shot, hemisphere shadowless light source 3-2 chooses for use the lamp pearl to carry out the homogeneous mixing for ruddiness LED, green glow LED, blue light LED and white light LED, arranges in hemisphere tangent plane inboard circumference, and the light emitting area shines to the hemisphere internal surface, scribbles white matte lacquer at the hemisphere internal surface, plays diffuse reflection effect.
According to the method and the device for detecting the mobile phone screen defects, the backlight LED light source and the matched defect identification algorithm which are specially designed in the invention can be adopted to quickly realize the mobile phone screen defect detection. Specifically, the lamp beads are selected to be red light LEDs, green light LEDs, blue light LEDs and white light LEDs which are uniformly mixed and arranged to form a planar light source or a hemispherical shadowless light source, and the brightness of the LEDs with different light colors is controlled independently. When the planar light source is used, a workpiece to be detected is placed on the hollow support frame and is conveyed to the position above the light source through the transparent conveying belt, different colored light is respectively lightened and photographed, the obtained 4 images are subjected to pixel-by-pixel point contrast analysis, and points with large differences are defect points.
Example 1:
as shown in fig. 1, a camera 1 and a lens 2 are arranged above a conveyor belt 7, a planar light source 3-1 is arranged below the conveyor belt 7, a proximity switch sensor 4 is arranged above the conveyor belt 7 and used for sensing a workpiece support frame and a sample 5 to reach a position below the conveyor belt 7, and photographing is triggered through time delay control, so that the image of the sample is ensured to be in the center of a collected image. When the device is used, the workpiece support frame and the sample 5 enter the conveying belt 7 from the previous process through the connecting bridge 6 of the previous process; triggering delayed photographing when the proximity switch sensor 4 senses that the workpiece support frame and the sample 5 reach the lower part of the workpiece support frame and the sample; the photographing process is to turn on the LED of a certain color light in sequence and photograph, namely, 4 times of photographing are carried out, wherein the photographing conditions correspond to different single color lights respectively. And after the photographing is finished, carrying out image analysis, judging whether the sample is defective or not, and entering the next procedure for the non-defective sample.
Example 2:
as shown in fig. 2, the difference from embodiment 1 is that a hemispherical shadowless light source 3-2 is arranged at the front end (below) of the lens, and the rest is the same as in scheme 1.
The outstanding characteristics of this embodiment lie in: the invention designs a special light source and a matched defect detection algorithm aiming at the defect detection requirement of the mobile phone screen, the matched detection device is simple and effective, the detection algorithm only designs integer comparison operation, and the algorithm speed is extremely high.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A mobile phone screen defect detection device is characterized in that: comprises a workpiece support frame, a specially-made light source module, a transmission module, a proximity switch sensor, an imaging module and a software module, the special light source module is a plane light source or a hemispherical shadowless light source, the transmission module comprises a transmission belt and a connecting bridge for connecting a previous process, the connecting bridge is arranged at one end of the transmission belt, the proximity switch sensor is arranged above the transmission belt, the imaging module comprises a camera and a lens, the workpiece support frame enters the conveying belt through the connecting bridge from the previous working procedure, the special light source module, the transmission module, the proximity switch sensor, the imaging module and the software module are electrically connected, when a planar light source is used, the light source is disposed below the transmission belt with the light emitting surface upward, and when a hemispherical shadowless light source is used, the light source is disposed at the front end (below) of the lens with the light emitting surface downward.
2. The device for detecting the defects of the mobile phone screen according to claim 1, wherein: the workpiece support frame is a hollow side groove support structure and is used for supporting a mobile phone screen workpiece.
3. The device for detecting the defects of the mobile phone screen according to claim 1, wherein: the frosted glass which plays a role in protection and light equalization is arranged on the surface of the plane light source, and the diffuse reflection backlight light source is obtained based on the frosted glass.
4. The device for detecting the defects of the mobile phone screen according to claim 1, wherein: the planar light source is formed by uniformly mixing and arranging red LEDs, green LEDs, blue LEDs and white LEDs, and the LEDs with different light colors are independently controlled to be bright and dark.
5. The device for detecting the defects of the mobile phone screen according to claim 1, wherein: the hemisphere shadowless light source comprises a hemisphere shell, wherein a light barrier for mixing the LED lamp beads 10 with the hemisphere shadowless light source is arranged in the hemisphere shell, and an opening is formed in the top of the hemisphere shell, so that a camera lens can conveniently penetrate through the opening to take pictures.
6. The device for detecting the defects of the mobile phone screen according to claim 1, wherein: the lamp beads of the hemispherical shadowless light source are red light LEDs, green light LEDs, blue light LEDs and white light LEDs which are uniformly mixed and are arranged on the periphery of the inner side of a hemispherical tangent plane, the light emitting surface irradiates the inner surface of the hemisphere, white matte paint is coated on the inner surface of the hemisphere to play a role in diffuse reflection, and the brightness of the LEDs with different light colors is independently controlled.
7. The device for detecting the defects of the mobile phone screen according to claim 1, wherein: when a plane light source is adopted, the transmission band of the transmission module is made of transparent or semitransparent materials.
8. The device for detecting the defects of the mobile phone screen according to claim 1, wherein: the proximity switch sensor is arranged above the conveying belt and close to one side of the camera and the incoming material of the conveying belt, is used for sensing the arrival of a workpiece and delaying the triggering of the camera to take a picture, and the delay time is determined by experiments so as to ensure that the workpiece is positioned in the center of an image during the picture taking.
9. The method for detecting the defect detection device of the mobile phone screen according to claim 1, wherein the method comprises the following steps: the method comprises the following specific steps that firstly, a workpiece support frame and a sample enter a conveying belt through a connecting bridge from an upper process, then, when a proximity switch senses that the workpiece support frame and the sample reach the lower part of the workpiece support frame and the sample, delayed photographing is triggered, the LEDs with a certain color light are sequentially turned on and photographed in the photographing process, namely, the photographing process is performed for 4 times, the photographing process corresponds to the lighting conditions of different single color lights respectively, after the photographing process is completed, the images are uploaded to a software module, image analysis is performed, whether the sample is defective or not is judged, and the defect-free sample enters a lower.
10. The method for detecting the defect detection device of the mobile phone screen according to claim 1, wherein the method comprises the following steps: the software module mainly realizes the following algorithm:
controlling to respectively light different color lights and taking a picture by using a color camera;
analyzing the 4 shot images point by point according to pixel values, wherein if one of the 4 pixel values at the same position in the 4 images is obviously different from the other 3 pixel values, the 4 images are potential defects;
counting the size of the potential defect area and the size of the phase difference value;
and respectively comparing the size of the potential defect area and the size of the phase difference value with the set corresponding threshold value to judge whether the defect exists.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011357765.2A CN112345546A (en) | 2020-11-27 | 2020-11-27 | Mobile phone screen defect detection device and detection method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113131A (en) * | 2021-12-03 | 2022-03-01 | 中科计算技术西部研究院 | Device and method for detecting scratch defects of reflective lens |
| CN115711886A (en) * | 2021-08-23 | 2023-02-24 | 苏州西斯派克智能装备有限公司 | Detection system and detection method for tray |
| CN116523905A (en) * | 2023-06-27 | 2023-08-01 | 广东华辉煌光电科技有限公司 | Defect detection method and system for lamp beads |
-
2020
- 2020-11-27 CN CN202011357765.2A patent/CN112345546A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115711886A (en) * | 2021-08-23 | 2023-02-24 | 苏州西斯派克智能装备有限公司 | Detection system and detection method for tray |
| CN114113131A (en) * | 2021-12-03 | 2022-03-01 | 中科计算技术西部研究院 | Device and method for detecting scratch defects of reflective lens |
| CN114113131B (en) * | 2021-12-03 | 2024-04-30 | 中科计算技术西部研究院 | Device and method for detecting scratch defects of reflecting lens |
| CN116523905A (en) * | 2023-06-27 | 2023-08-01 | 广东华辉煌光电科技有限公司 | Defect detection method and system for lamp beads |
| CN116523905B (en) * | 2023-06-27 | 2023-10-20 | 广东华辉煌光电科技有限公司 | Defect detection method and system for lamp beads |
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