CN119310088A - A method and device for detecting internal contamination of a fully transparent color film LCD - Google Patents
A method and device for detecting internal contamination of a fully transparent color film LCD Download PDFInfo
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- CN119310088A CN119310088A CN202411856271.7A CN202411856271A CN119310088A CN 119310088 A CN119310088 A CN 119310088A CN 202411856271 A CN202411856271 A CN 202411856271A CN 119310088 A CN119310088 A CN 119310088A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000011109 contamination Methods 0.000 title claims 3
- 238000001514 detection method Methods 0.000 claims abstract description 49
- 238000012545 processing Methods 0.000 claims abstract description 22
- 239000003086 colorant Substances 0.000 claims abstract description 7
- 239000011521 glass Substances 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims 1
- 235000019646 color tone Nutrition 0.000 abstract description 14
- 241001270131 Agaricus moelleri Species 0.000 abstract description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 14
- 230000007547 defect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 5
- 230000002950 deficient Effects 0.000 description 3
- 238000011895 specific detection Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 208000003464 asthenopia Diseases 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
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Abstract
The invention discloses a full-color-film LCD internal pollution detection method and device, the method comprises the following steps of S1, placing an LCD product to be detected on a detection platform, S2, collecting gray scales of image display areas under three different color backlights by an industrial camera based on the same exposure time, judging main colors of the LCD product by an image processing module according to the collected gray scales of the image display areas, S3, taking images collected under the main colors corresponding to light sources as main images and images collected under the other two light sources as auxiliary images, and S4, in the images collected by the main color-tone backlights, if the LCD product exists in the internal pollution, the area where the internal pollution exists is black, and in the other two auxiliary images, if the LCD product exists in the internal pollution, the area where the internal pollution exists is white, so that the internal pollution detection of the full-color-film LCD is completed. The invention can efficiently and stably detect the internal dirt of the color film type LCD product, accurately distinguish the color film type LCD product from the surface dirt, and better meet the process requirements.
Description
Technical Field
The invention relates to an LCD product optical defect detection method, in particular to a full-transparent color film LCD inner dirt detection method and device.
Background
Among the existing display products, the LCD products can be divided into reflective type, full-transparent type and semi-transparent type, and the full-transparent color film type LCD is one of the full-transparent type LCD products, and the orientation of the liquid crystal molecules in the liquid crystal cell in different directions is matched with the fixed polarizer angles to present different film colors. The LCD product is produced through a plurality of processes, and the LCD product is inevitably defective during the production process due to the difference in process level. In the prior art, stains in a liquid crystal box are common defects, damage to a liquid crystal molecular structure and abnormal display are caused, the stains belong to intolerable defect types, and the stains are selected as defective products in the screening process and are not allowed to be missed. The current defect detection mode is mainly manual, however, the manual detection method has low production efficiency, and long-time work is easy to cause eye fatigue and influence the detection result. Although the automatic defect detection process can be realized in a machine vision-dependent manner, it is difficult to distinguish stains on the polarizer protective film on the surface of the LCD from stains in the LCD, and the stains on the protective film are easily misjudged as bad, so that missed detection or misjudgment is caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing the full-transparent color film LCD internal dirt detection method and the device which can accurately detect dirt inside LCD products and improve the defect detection precision and the working efficiency of the LCD products aiming at the defects of the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme.
The method for detecting the inner dirt of the full-color-transparent LCD is realized based on a device, the device comprises an image processing module, an industrial camera, a color backlight source and a detection platform, the color backlight source is located below the detection platform, the industrial camera is located above the detection platform, image data shot by the industrial camera are transmitted to the image processing module, the method comprises the following steps of S1, placing an LCD product to be detected on the detection platform, S2, collecting gray scales of image display areas under three backlight sources with different colors based on the same exposure time, judging the main color tone of the LCD product by the image processing module according to the collected gray scales of the image display areas, S3, taking images collected under the main color tone corresponding to the light sources as main images, taking the images collected under the other two light sources as auxiliary images, S4, in the images collected by the main color-tone backlight source, if the LCD product is stored in the inner dirt, the area where the inner dirt is located is black, and in the other two auxiliary images, if the LCD product is stored in the inner dirt area, then detecting the inner dirt is completed, and the full-color-transparent LCD is detected.
Preferably, in the step S2, the color backlight source is controlled to emit a green light source and the industrial camera collects images, the camera exposure time is adjusted, and the color backlight source is controlled to emit red light and blue light respectively under the recorded camera exposure time condition, and the industrial camera correspondingly collects two images.
Preferably, in the step S2, after adjusting the exposure time of the camera, the range of gray values of the background of the image is limited to 180 to 220.
Preferably, the image processing module includes a dominant hue analysis module and an internal stain detection module.
Preferably, in the step S2, the dominant hue analysis module compares the gray levels of the display areas of the three images under the same exposure time, and considers the light source color corresponding to the image with the largest gray level value of the display area as the dominant hue of the LCD product.
Preferably, in the step S3, after the main color tone of the LCD product film color is obtained, the gray scale interval of the display area is set to 80 to 100, the exposure time of the camera is adjusted, and the industrial camera captures images under the irradiation of the red, green and blue light sources.
The device comprises an image processing module, an industrial camera, a color backlight source and a detection platform, wherein the color backlight source is positioned below the detection platform, the industrial camera is positioned above the detection platform, image data shot by the industrial camera are transmitted to the image processing module, and the device is used for executing the method.
Preferably, a light source controller is included, and the light source controller is connected between the image processing module and the color backlight.
Preferably, a transparent glass plate for placing the LCD product to be detected is arranged on the top of the detection platform.
Preferably, the lens of the industrial camera is aligned with the transparent glass plate.
In the method for detecting the inner dirt of the full-transparent color film LCD, three images of a color backlight source under the illumination of red light, green light and blue light respectively are obtained, the main color tone color of the LCD product is obtained by analyzing the three images based on a color film main color tone analysis algorithm, the image collected under the light source corresponding to the main color tone color is used as a main image, the images collected under the other two light sources are used as auxiliary images, and in the specific detection process, whether the same area of the main image and the auxiliary image has a different color area, namely the main image area is blackened relative to background color and the auxiliary image is blackened relative to background color, and meanwhile, dirt on a protective film is blackened relative to background color in the main image and the auxiliary image, so that the inner dirt of the LCD product can be accurately detected.
Drawings
FIG. 1 is a block diagram of a full color film LCD internal dirt detection device;
FIG. 2 is a schematic diagram of the structure of the device for detecting the dirt in the LCD with full color film;
FIG. 3 is a main diagram illustrating the method for detecting the dirt in the full color LCD according to the present invention;
FIG. 4 is a schematic diagram of an auxiliary image in the method for detecting the dirt in the full color LCD according to the present invention;
Fig. 5 is a schematic diagram of an auxiliary diagram in the method for detecting the dirt in the full-color-film LCD according to the present invention.
Detailed Description
The invention is described in more detail below with reference to the drawings and examples.
The invention discloses a method for detecting dirt in a full-transparent color film LCD (liquid crystal display), please refer to fig. 1 and 2, which is realized based on a device, wherein the device comprises an image processing module 1, an industrial camera 2, a color backlight source 3 and a detection platform 4, the color backlight source 3 is positioned below the detection platform 4, the industrial camera 2 is positioned above the detection platform 4, and image data shot by the industrial camera 2 is transmitted to the image processing module 1, and the method comprises the following steps:
step S1, placing an LCD product to be detected on the detection platform 4;
Step S2, the industrial camera 2 collects the gray scale of the image display area under three backlight sources with different colors based on the same exposure time, and the image processing module 1 judges the main tone of the LCD product according to the collected gray scale of the image display area;
Step S3, taking the image collected under the light source corresponding to the main tone as a main image and taking the images collected under the other two light sources as auxiliary images;
And S4, in the image acquired by the main tone backlight source, if the LCD product is polluted internally, the area where the internal pollution is located is black, and in the other two auxiliary images, if the LCD product is polluted internally, the area where the internal pollution is located is white, so that the internal pollution detection of the full color-transparent film LCD is completed.
According to the method, three images of the color backlight source under the illumination of red light, green light and blue light are obtained, the three images are analyzed based on a color film main tone analysis algorithm to obtain the main tone color of the LCD product, the image collected under the light source corresponding to the main tone color is used as a main image, the images collected under the other two light sources are used as auxiliary images, in a specific detection process, whether different color areas exist in the same area of the main image and the auxiliary image, namely, the main image area is blackish relative to background color, the auxiliary image is blackish relative to the area of background color, and meanwhile, dirt on the protective film is blackish relative to the background color in the main image and the auxiliary image, so that the internal dirt of the LCD product is accurately detected, the defect detection precision of the LCD product can be effectively improved.
As a preferred manner, the image processing module 1 includes a main tone analysis module 10 and an internal stain detection module 11.
In this embodiment, before the detection and analysis, the main color tone of the LCD product should be determined, for this purpose, in the step S2, the color backlight source 3 is controlled to emit a green light source and the industrial camera 2 collects images, the camera exposure time is adjusted, under the recorded camera exposure time conditions, the color backlight source 3 is controlled to emit red light and blue light respectively, and the industrial camera 2 collects two images correspondingly, further, in the step S2, after the camera exposure time is adjusted, the range of the background gray level of the images is limited to be between 180 and 220.
On this basis, in the step S2, the dominant hue analysis module 10 compares the gray scales of the display areas of the three images under the same exposure time, and considers the light source color corresponding to the image with the largest gray scale value of the display area as the dominant hue of the LCD product.
In the preferred embodiment of the invention, the principle of recognizing the main color tone of an LCD product is that a full-transparent LCD to be detected is placed on a detection platform, a color backlight source is controlled to emit a green light source to collect images, the exposure time of a camera is regulated, the range of the background gray level value of the images is limited between 180 and 220 to prevent the whole image from overexposure, the current exposure time of the camera is recorded, the color backlight source is controlled to emit red light and blue light to collect two images at the same time under the obtained exposure time of the camera, and the gray level of an image display area under three backlight sources with different colors collected under the same exposure time is further compared, wherein the light source color corresponding to the image with the largest gray level value of the display area is the main color tone of the LCD.
In a specific detection process, in the step S3, after the main color of the LCD product film color is obtained, the gray scale interval of the display area is set to 80 to 100, the exposure time of the camera is adjusted, and the industrial camera 2 shoots images under the irradiation of the red, green and blue light sources.
Specifically, in this embodiment, after obtaining the main color tone of the film color of the LCD product, the gray scale interval of the display area is set to be between 80 and 100, and then the exposure time of the camera is adjusted to obtain the image irradiated by the three light sources of red, green and blue. In the image acquired by the main color tone backlight source, the liquid crystal molecules in the liquid crystal box have high light transmittance to the current light source, if internal dirt exists in the liquid crystal box, the liquid crystal molecules in the liquid crystal box are damaged in orientation, the area where the internal dirt exists can be black, in the image acquired by the other two light sources, the liquid crystal in the liquid crystal box has an inhibiting effect on the light transmittance of the current light source, if the internal dirt exists, the liquid crystal molecules are damaged in orientation, the inhibiting effect on the light transmittance of the current light source is reduced, and the area where the internal dirt exists can be white. Based on the principle, the invention takes the color backlight image corresponding to the main color tone of the color film as a main image, the other two images as auxiliary images, the area where the inner dirt is in the main image is a black area, the area where the other two auxiliary images are in is white, the image presentation effect of the inner dirt under different light sources is shown in fig. 3 to 5, in addition, the dirt on the glass surface does not damage the analysis orientation of the liquid crystal box, and the three images are black.
On the basis, the embodiment also provides a device for detecting the dirt in the full-transparent color film LCD, which is characterized by comprising an image processing module 1, an industrial camera 2, a color backlight 3 and a detection platform 4, wherein the color backlight 3 is positioned below the detection platform 4, the industrial camera 2 is positioned above the detection platform 4, the image data shot by the industrial camera 2 is transmitted to the image processing module 1, and the device is used for executing the method.
Referring to fig. 1, the present embodiment includes a light source controller 5, and the light source controller 5 is connected between the image processing module 1 and the color backlight 3. Referring to fig. 2, a transparent glass plate 6 for placing the LCD product to be tested is disposed on top of the testing platform 4. Further, the lens 7 of the industrial camera 2 is aligned with the transparent glass plate 6.
The method and the device for detecting the inner dirt of the full-transparent color film LCD, disclosed by the invention, realize the stable and rapid detection of the inner dirt of the full-transparent color film LCD, effectively improve the detection effect of defective products, reduce the erroneous judgment of the dirt on the protective film, and have higher inner dirt detection accuracy in practical application.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and modifications, equivalent substitutions or improvements made within the technical scope of the present invention should be included in the scope of the present invention.
Claims (10)
1. The method is characterized in that the method is realized based on a device, the device comprises an image processing module, an industrial camera, a color backlight source and a detection platform, the color backlight source is positioned below the detection platform, the industrial camera is positioned above the detection platform, and image data shot by the industrial camera is transmitted to the image processing module, and the method comprises the following steps:
step S1, placing an LCD product to be detected on the detection platform;
Step S2, the industrial camera collects the gray scale of the image display areas under three backlight sources with different colors based on the same exposure time, and the image processing module judges the dominant color of the LCD product according to the collected gray scale of the image display areas;
Step S3, taking the image collected under the light source corresponding to the main tone as a main image and taking the images collected under the other two light sources as auxiliary images;
And S4, in the image acquired by the main tone backlight source, if the LCD product is polluted internally, the area where the internal pollution is located is black, and in the other two auxiliary images, if the LCD product is polluted internally, the area where the internal pollution is located is white, so that the internal pollution detection of the full color-transparent film LCD is completed.
2. The method for detecting the inner dirt of the full-color-film LCD according to claim 1, wherein in the step S2, the color backlight source is controlled to emit a green light source and the industrial camera is used for collecting images, the camera exposure time is adjusted, and under the recorded camera exposure time conditions, the color backlight source is controlled to emit red light and blue light respectively and the industrial camera is used for correspondingly collecting two images.
3. The method for detecting the fouling in the full-color-film LCD according to claim 2, wherein in the step S2, after adjusting the exposure time of the camera, the range of the background gray level of the image is limited to 180 to 220.
4. The method of claim 2, wherein the image processing module comprises a main tone analysis module and an internal contamination detection module.
5. The method of claim 4, wherein in the step S2, the dominant color analysis module compares the gray levels of the display areas of the three images at the same exposure time, and considers the color of the light source corresponding to the image with the largest gray level value of the display area as the dominant color of the LCD product.
6. The method of claim 1, wherein in step S3, after obtaining the main color of the LCD product, the gray scale interval of the display area is set to 80-100, the exposure time of the camera is adjusted, and the industrial camera captures images under the irradiation of the red, green and blue light sources.
7. An apparatus for detecting dirt in a full-transparent color film LCD, comprising an image processing module, an industrial camera, a color backlight and a detection platform, wherein the color backlight is located below the detection platform, the industrial camera is located above the detection platform, and image data captured by the industrial camera is transmitted to the image processing module, and the apparatus is used for executing the method of claim 1.
8. The device for detecting the fouling in the full color film LCD according to claim 7, comprising a light source controller, the light source controller is connected between the image processing module and the color backlight source.
9. The LCD internal contamination detection apparatus of claim 7, wherein the top of the detection platform is provided with a transparent glass plate for placing the LCD product to be detected.
10. The full-color film LCD in-soil detection device according to claim 9, wherein a lens of the industrial camera is aligned with the transparent glass plate.
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| CN202411856271.7A CN119310088B (en) | 2024-12-17 | 2024-12-17 | A method and device for detecting internal contamination of a fully transparent color film LCD |
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| CN202411856271.7A CN119310088B (en) | 2024-12-17 | 2024-12-17 | A method and device for detecting internal contamination of a fully transparent color film LCD |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11132750A (en) * | 1997-10-30 | 1999-05-21 | Matsushita Electric Ind Co Ltd | Point defect detection apparatus and method |
| JP2007192613A (en) * | 2006-01-18 | 2007-08-02 | Micronics Japan Co Ltd | Defect inspection method and apparatus for color liquid crystal panel |
| CN103076344A (en) * | 2012-12-27 | 2013-05-01 | 深圳市华星光电技术有限公司 | Defect detection method and device for display panel |
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- 2024-12-17 CN CN202411856271.7A patent/CN119310088B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11132750A (en) * | 1997-10-30 | 1999-05-21 | Matsushita Electric Ind Co Ltd | Point defect detection apparatus and method |
| JP2007192613A (en) * | 2006-01-18 | 2007-08-02 | Micronics Japan Co Ltd | Defect inspection method and apparatus for color liquid crystal panel |
| CN103076344A (en) * | 2012-12-27 | 2013-05-01 | 深圳市华星光电技术有限公司 | Defect detection method and device for display panel |
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