Method for distinguishing foreign matters of LCD (Liquid Crystal Display) module with cover plate and related product thereof

Abstract

The invention discloses a method for distinguishing foreign matters of a liquid crystal display (LCD) module with a cover plate and related products thereof, the LCD module with the cover plate comprises a liquid crystal glass layer and a polaroid layer arranged on the liquid crystal glass layer, the cover plate is located above the polaroid layer, the foreign matters comprise internal foreign matters and surface foreign matters, and the internal foreign matters and the surface foreign matters are separated from each other. The method comprises the steps that in different shooting light polarization directions, the LCD module with the cover plate is shot to obtain a first photo and a second photo, the first photo comprises a first dark spot, and the second photo comprises a second dark spot; and comparing the first dark spot with the second dark spot to distinguish internal foreign matters and / or surface foreign matters of the LCD module with the cover plate. Through the scheme disclosed by the invention, internal foreign matters and surface foreign matters of the LCD module with the cover plate can be distinguished, so that the accuracy and the efficiency of detecting the foreign matters can be improved.

Description

Technical Field

[0001] The present application generally relates to the field of defect detection technology, and more specifically, to a method, electronic device, and computer-readable storage medium for distinguishing internal foreign matter and surface foreign matter of an LCD module. Background Art

[0002] Liquid Crystal Display (LCD) module is a common display device that uses liquid crystal technology to convert electrical signals into visible light and is used to display images, text and other information in various electronic products.

[0003] An LCD module may generally include a liquid crystal panel, a backlight source, a driving circuit, and auxiliary components, wherein the liquid crystal panel of the LCD module may include a liquid crystal glass layer and a polarizer layer. In addition, the surface of the aforementioned LCD module may also be covered with a cover plate. When producing an LCD module with a cover plate, it is easy to be contaminated by dust or other impurities, resulting in foreign matter entering the interior, thereby affecting the final display effect of the aforementioned LCD module with a cover plate. The aforementioned defect may be referred to as a foreign matter defect in the bonding process or a foreign matter defect in the biased bonding process.

[0004] At present, the Automated Optical Inspection (AOI) system can usually be used to detect defects on the surface of products. However, when using AOI to detect the above-mentioned foreign body defects, there is a problem that the dust on the cover surface and the internal foreign body defects cannot be distinguished. Specifically, the above-mentioned surface dust and internal foreign body defects are the same or similar in imaging results, and the difference between the two cannot be seen. Since surface dust is not a defect, mistaking surface dust for internal foreign body defects will lead to defect over-inspection, which in turn affects the accuracy and efficiency of detection.

[0005] In view of this, there is an urgent need to provide a solution for distinguishing internal foreign matter and surface foreign matter of an LCD module with a cover plate, so as to conveniently and quickly distinguish the aforementioned surface dust and internal foreign matter defects, thereby improving the accuracy and efficiency of detection. Summary of the invention

[0006] In order to at least solve one or more of the technical problems mentioned above, the present application proposes solutions for distinguishing foreign matter inside and foreign matter on the surface of an LCD module with a cover plate in multiple aspects.

[0007] In a first aspect, the present application provides a method for distinguishing foreign matter in an LCD module with a cover plate, wherein the LCD module with a cover plate comprises: a liquid crystal glass layer and a polarizing layer arranged on the liquid crystal glass layer, the cover plate is located above the polarizing layer, and the foreign matter comprises internal foreign matter and surface foreign matter, and the method comprises: photographing the LCD module with the cover plate under different polarization directions of shooting light to obtain a first photograph and a second photograph, wherein the first photograph comprises a first dark spot and the second photograph comprises a second dark spot; comparing the first dark spot and the second dark spot to distinguish internal foreign matter and / or surface foreign matter in the LCD module with the cover plate.

[0008] In some embodiments, photographing the LCD module with a cover plate by a camera device under different shooting light polarization directions to obtain a first photo and a second photo includes: adjusting a polarizing device to obtain a first shooting light polarization direction, wherein the first shooting light polarization direction is parallel to the polarization direction of the polarizing film layer of the LCD module with a cover plate; based on the first shooting light polarization direction, photographing the LCD module with a cover plate to obtain the first photo; adjusting the polarizing device to obtain a second shooting light, wherein the polarization direction of the second shooting light is perpendicular to the polarization direction of the polarizing film layer of the LCD module with a cover plate; based on the second shooting light, photographing the LCD module with a cover plate to obtain the second photo.

[0009] In some embodiments, comparing the first dark spot and the second dark spot to distinguish internal foreign matter and / or surface foreign matter of the LCD module with a cover plate includes: determining the relationship between the first dark spot and the second dark spot, wherein the relationship includes a positional relationship and a shape relationship; if the relationship between the first dark spot and the second dark spot is the same, then it is a surface foreign matter; if the relationship between the first dark spot and the second dark spot is different, then it is an internal foreign matter.

[0010] In some embodiments, photographing the LCD module with the cover plate includes using a camera and a telecentric lens to ensure the stability of image magnification, thereby improving the accuracy and reliability of photographing.

[0011] In some embodiments, a light source is also included to cooperate with the telecentric lens to achieve bright field lighting.

[0012] In some embodiments, the polarization device includes a polarizer or a polarization beam splitter prism, wherein the polarizer is located between the light source and the telecentric lens or between the telecentric lens and the LCD module with a cover plate, and the polarization beam splitter prism is located inside the telecentric lens.

[0013] In some embodiments, the positional relationship includes: obtaining a first coordinate of the first dark spot in the first photo; obtaining a second coordinate of the second dark spot in the second photo; determining the first coordinate and the second coordinate; if the first coordinate and the second coordinate are equal, the positional relationship between the first dark spot and the second dark spot is the same; if the first coordinate and the second coordinate are not equal, the positional relationship between the first dark spot and the second dark spot is not the same.

[0014] In some embodiments, the surface foreign matter includes surface dust located on the cover plate, and the internal foreign matter includes internal foreign matter defects located on the polarizer layer.

[0015] In a second aspect, the present application provides an electronic device for distinguishing between internal foreign matter and surface foreign matter of an LCD module with a cover plate, comprising: a processor; and a memory on which computer instructions for distinguishing between internal foreign matter and surface foreign matter of an LCD module with a cover plate are stored, and when the computer instructions are executed by the processor, the electronic device implements the determination method as described in any one of the first aspects of the present invention.

[0016] In a third aspect, the present application provides a computer-readable storage medium having stored thereon computer program instructions for distinguishing between internal foreign matter and surface foreign matter of an LCD module with a cover plate. When the computer program instructions are executed by one or more processors, the processors implement the determination method as described in any one of the first aspects of the present invention.

[0017] The present invention has significant technical advantages through a method, electronic device and computer-readable storage medium for distinguishing internal foreign matter and surface foreign matter of an LCD module as provided above. Specifically, the embodiment of the present application takes pictures of the LCD module with a cover plate under different polarization directions of the shooting light to obtain a first photo and a second photo; by comparing the first dark spot and the second dark spot, the internal foreign matter and / or surface foreign matter of the LCD module with a cover plate can be distinguished, and the accuracy and efficiency of the detection can also be improved. Furthermore, the embodiment of the present application can ensure the stability of image magnification by using a camera and a telecentric lens, thereby improving the accuracy and reliability of shooting. Furthermore, by cooperating with a light source and a telecentric lens, bright field lighting can be achieved, effectively improving the collimation of light. Furthermore, by arranging the polarizer and the LCD module with a cover plate to be tilted, stray light interference can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 An exemplary flow chart of a method 100 for distinguishing foreign matter inside and foreign matter on the surface of an LCD module with a cover plate according to some embodiments of the present application is shown; Figure 2 An exemplary flow chart of a method 200 for photographing the LCD module with a cover plate under different polarization directions of photographing light in some embodiments of the present application is shown; Figure 3 An exemplary principle diagram showing an embodiment of the present application in which the shooting light is perpendicular to the polarization direction of the polarizer; Figure 4 An exemplary principle diagram showing an embodiment of the present application in which the shooting light is parallel to the polarization direction of the polarizer; Figure 5 An exemplary flow chart of a method 500 for distinguishing internal foreign matter and / or surface foreign matter of an LCD module with a cover plate according to an embodiment of the present application is shown; Figure 6 A schematic diagram showing a method of taking a photo of an LCD module with a cover plate using a polarizing plate according to some embodiments of the present application is shown; Figure 7 Schematic diagrams showing other embodiments of the present application of using a polarizing plate to take photos of an LCD module with a cover plate; Figure 8 A schematic diagram showing some embodiments of the present application of using a polarization beam splitter prism to take a picture of an LCD module with a cover plate; FIG. 9 ( a ) shows an exemplary imaging diagram of an LCD module with a cover plate taken in some embodiments of the present application, including internal foreign matter and surface dust; FIG9( b ) shows an exemplary image of an LCD module with a cover plate taken in some embodiments of the present application, including dust on the surface; Fig.10 A schematic block diagram of an electronic device 1000 for distinguishing internal foreign matter and surface foreign matter of an LCD module with a cover plate according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0020] It should be understood that the terms "include" and "comprising" used in the specification and claims of the present application indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in this application specification and claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms. It should also be further understood that the term "and / or" used in this application specification and claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0022] As used in this specification and claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0023] The specific implementation of the present application is described in detail below with reference to the accompanying drawings.

[0024] Figure 1An exemplary flow chart of a method 100 for distinguishing foreign matter in an LCD module with a cover plate in some embodiments of the present application is shown, wherein the LCD module with a cover plate comprises: a liquid crystal glass layer and a polarizing layer arranged on the liquid crystal glass layer, the cover plate is located above the polarizing layer, the foreign matter comprises internal foreign matter and surface foreign matter, and the method for distinguishing internal foreign matter and surface foreign matter in the LCD module comprises: in step S110, photographing the aforementioned LCD module with a cover plate under different polarization directions of shooting light to obtain a first photograph and a second photograph, wherein the aforementioned first photograph comprises a first dark spot, and the second photograph comprises a second dark spot; in step S120, comparing the aforementioned first dark spot and the second dark spot to distinguish the aforementioned internal foreign matter and / or surface foreign matter in the aforementioned LCD module with a cover plate.

[0025] In one embodiment, the aforementioned liquid crystal glass layer can reflect the aforementioned light when receiving the light, wherein the aforementioned reflection can include mirror reflection. The aforementioned polarizer layer can be used to convert natural light into polarized light, and guide the polarized light to the liquid crystal glass layer for further processing. In one embodiment, the aforementioned cover plate can include a cover glass layer, which is used to prevent the aforementioned LCD module with cover plate from receiving physical damage such as scratches and impacts, and can also make the surface of the aforementioned LCD module with cover plate smoother and more beautiful. In one embodiment, the aforementioned foreign matter can include internal foreign matter and surface foreign matter, wherein the surface foreign matter can include surface dust, which is located on the aforementioned cover plate, and the aforementioned internal foreign matter can include internal foreign matter defects, which are located on the aforementioned polarizer layer.

[0026] It should be understood that the aforementioned different shooting light polarization directions may include directions parallel to and perpendicular to the polarization direction of the polarizer layer, wherein when the shooting light polarization direction is parallel to the polarization direction of the aforementioned polarizer layer, the aforementioned shooting light can pass through the polarizer layer, thereby being transmitted to the liquid crystal glass layer, and then illuminating the aforementioned liquid crystal glass layer; when the shooting light polarization direction is perpendicular to the polarization direction of the aforementioned polarizer layer, the aforementioned shooting light cannot pass through the polarizer layer, and therefore the light cannot be transmitted to the liquid crystal glass layer, and at this time the aforementioned liquid crystal glass layer cannot be illuminated. Regarding taking photos using different shooting light polarization directions, this will be discussed later in conjunction with Figure 3-4 Specific instructions.

[0027] In some embodiments, when the shooting light propagates to the liquid crystal glass layer, the shooting light may propagate to the liquid crystal glass layer at an angle, or the shooting light may propagate to the liquid crystal glass layer vertically (ie, the incident angle is 0 degrees).

[0028] In one embodiment, the aforementioned photographing of the LCD module with a cover plate may include using a camera and a telecentric lens to photograph the LCD module with a cover plate to achieve bright field lighting, which can ensure the stability of image magnification, thereby improving the accuracy and reliability of shooting. Specifically, the aforementioned camera may include an industrial camera. In one embodiment, the aforementioned industrial camera may use an image sensor to capture the image of the target object, and evaluate the quality, size, appearance and other characteristics of the product through image processing and analysis technology; the aforementioned telecentric lens may include a telecentric lens with internal coaxial illumination, which may integrate the telecentric illumination optical path and the telecentric imaging optical path into one through a dichroic prism, thereby achieving high-precision detection of tiny objects. In one embodiment, the aforementioned bright field lighting may include using a light source to directly illuminate the surface of the illuminated object, so that it reflects clear light, thereby presenting a bright and detailed image.

[0029] In one embodiment, the aforementioned surface foreign matter may include surface dust, which is located on the aforementioned cover plate, and the aforementioned internal foreign matter may include internal foreign matter defects, which may be located on the aforementioned polarizer layer.

[0030] Figure 2 FIG. 2 shows an exemplary flow chart of a method 200 for photographing the LCD module with a cover plate under different polarization directions of photographing light according to an embodiment of the present application. Figure 2 The aforementioned method may include: in step S210, adjusting the polarizing device to obtain the polarization direction of the first shooting light, wherein the polarization direction of the first shooting light is parallel to the polarization direction of the polarizer layer of the LCD module. In step S220, based on the polarization direction of the aforementioned first shooting light, taking a photo of the aforementioned LCD module with a cover plate to obtain a first photo. In step S230, adjusting the polarizing device to obtain a second shooting light, wherein the polarization direction of the second shooting light is perpendicular to the polarization direction of the polarizer layer of the LCD module with a cover plate. In step S240, based on the aforementioned second shooting light, taking a photo of the aforementioned LCD module with a cover plate to obtain a second photo.

[0031] In one embodiment, the aforementioned polarization device may include a polarizer, a polarization beam splitter, a wave plate, and a polarization beam splitter, etc. Preferably, the present invention may select a polarizer or a polarization beam splitter, wherein the aforementioned polarizer can be used to allow only light waves vibrating in a certain specific direction to pass through, and this direction can be called the polarization direction, and it can absorb light vibrating perpendicularly thereto, that is, it has dichroism. The aforementioned polarization beam splitter separates the horizontal polarization (P polarized light) and the vertical polarization (S polarized light) of a beam of light. When the light is incident at the Brewster angle, the transmittance of the P polarized light is 1, while the transmittance of the S polarized light is less than 1. After multiple reflections and transmissions of the multilayer film structure, the P polarization component is completely transmitted, while most of the S polarization component is reflected. By using the aforementioned polarization beam splitter, better imaging quality can be obtained during imaging, and the stability and accuracy of the optical path can also be maintained.

[0032] In one embodiment, when it is necessary to determine whether the polarization direction of the light is parallel or perpendicular to the polarization direction of the polarizer layer, it can be determined based on the polarization direction marked on the polarizer itself and the polarization direction of the product itself, or it can be judged by the imaging of the foreign object. For example, the real-time imaging of the foreign object can be observed while rotating the polarizer. When the imaging of the foreign object completely disappears, the polarization direction at this time is perpendicular to the polarization direction of the polarizer layer.

[0033] Figure 3 An exemplary schematic diagram of the shooting light of the embodiment of the present application is shown in which the polarization direction of the polarizer is perpendicular to that of the polarizer. It should be understood that when the polarization direction of the first shooting light is parallel to the polarization direction of the polarizer layer of the LCD module with cover plate, the first shooting light can penetrate the polarizer.

[0034] In one embodiment, Figure 3 As shown, the aforementioned polarizing film layer can be arranged above the aforementioned liquid crystal glass layer, and the aforementioned cover plate can be located above the polarizing film layer. When the aforementioned first shooting light propagates above the aforementioned cover plate glass layer, a part of the light will be reflected by the cover plate glass layer, and the light reflected by the cover plate glass layer can enter the aforementioned camera, and another part of the light can penetrate the cover plate glass layer and continue to propagate downward to the polarizing film layer. Since the polarization direction of the first shooting light is parallel to the polarization direction of the polarizing film layer of the aforementioned LCD module with cover plate at this time, the aforementioned first shooting light can penetrate the aforementioned polarizing film. After penetrating the aforementioned polarizing film, the light can be irradiated above the aforementioned liquid crystal glass layer. After receiving the aforementioned light, the liquid crystal glass layer can reflect it by mirror, and the light reflected by the mirror of the aforementioned liquid crystal glass can propagate to the aforementioned camera.

[0035] It is understandable that the surface dust may be located on the cover plate. When the first shooting light passes through the cover glass layer, if the light encounters the dust, scattered reflection will occur. Therefore, the light reflected into the camera will be much less than the light reflected into the camera by the cover glass layer and the liquid crystal glass layer. Therefore, in the final image, the dust appears as a dark spot relative to other areas. The internal defect may be located on the polarizing film layer. When the first shooting light passes through the polarizing film layer, if the light encounters the internal defect, the light is scattered in this area and cannot continue to propagate downward. Therefore, no light is reflected by the liquid crystal glass layer in this area, so a dark spot appears in the final image.

[0036] Figure 4 An exemplary schematic diagram of the shooting light of the embodiment of the present application is shown in which the polarization direction of the polarizer is parallel to that of the polarizer. It should be understood that when the polarization direction of the second shooting light is perpendicular to the polarization direction of the polarizer layer of the LCD module with a cover plate, the second shooting light cannot penetrate the polarizer.

[0037] In one embodiment, Figure 4 The aforementioned polarizer layer can be arranged above the aforementioned liquid crystal glass layer, and the aforementioned cover plate is located above the polarizer layer. It should be understood that when the aforementioned second shooting light reaches above the aforementioned cover plate glass layer, a part of the light will be reflected to form the light reflected by the mirror surface of the cover plate glass and enter the aforementioned camera, and another part of the light can penetrate the aforementioned cover plate glass layer and continue to propagate downward to the polarizer layer. Since the polarization direction of the second shooting light is perpendicular to the polarization direction of the polarizer layer of the aforementioned LCD module with cover plate at this time, the aforementioned second shooting light cannot penetrate the aforementioned polarizer, so no light can propagate to the aforementioned liquid crystal glass layer. At this time, no light is reflected from the aforementioned liquid crystal glass layer, and no reflected light can pass through the aforementioned foreign matter defect. Therefore, no light from the aforementioned foreign matter defect can be reflected to the aforementioned camera. The light in the camera is only the mirror reflection of the aforementioned cover plate glass layer and the scattered reflection of the aforementioned surface foreign matter. At this time, only the surface dust appears as a dark spot in the final imaging.

[0038] Figure 5 An exemplary flow chart of a method 500 for distinguishing internal foreign matter and / or surface foreign matter of an LCD module with a cover plate according to an embodiment of the present application is shown, comprising: S510 judging the relationship between the aforementioned first dark spot and the aforementioned second dark spot, wherein the aforementioned relationship includes a positional relationship and a shape relationship; S520 if the relationship between the aforementioned first dark spot and the aforementioned second dark spot is the same, then it is a surface foreign matter; S530 if the relationship between the aforementioned first dark spot and the aforementioned second dark spot is different, then it is an internal foreign matter.

[0039] In one embodiment, the aforementioned determination of the positional relationship may include obtaining a first coordinate of the first dark spot in the first photo; obtaining a second coordinate of the second dark spot in the second photo; determining the first coordinate and the second coordinate; if the first coordinate and the second coordinate are equal, then the positional relationship between the first dark spot and the second dark spot is the same; if the first coordinate and the second coordinate are not equal, then the positional relationship between the first dark spot and the second dark spot is not the same.

[0040] It should be understood that after obtaining the aforementioned first photo and the second photo, the coordinates of the first dark spot and / or the second dark spot can be obtained by using drawing software (such as Photoshop), programming language (such as MATLAB) or using an existing detection algorithm. Preferably, an existing detection algorithm (such as YOLOV7) can be selected to obtain the coordinates of the aforementioned first dark spot and / or the second dark spot, which can identify a specific target from the image and determine its position. By using the aforementioned detection algorithm, high-precision detection can be achieved, thereby obtaining an accurate position.

[0041] Figure 6 A schematic diagram of using a polarizing film to take a photo of an LCD module with a cover plate in some embodiments of the present application is shown, wherein the aforementioned LCD module with a cover plate may include a cover plate LCD product. Taking a photo of the aforementioned LCD module with a cover plate may include using a camera, a telecentric lens, a light source and a polarizing film, wherein the aforementioned camera may be connected to the aforementioned telecentric lens to ensure the stability of image magnification, thereby improving the accuracy and reliability of shooting. The aforementioned light source may cooperate with the telecentric lens to achieve bright field lighting. Specifically, the aforementioned light source may include a point light source, connected to the coaxial interface of the aforementioned telecentric lens, and through the internal optical path of the telecentric lens, vertically downward bright field lighting may be achieved, and the aforementioned polarizing film may be arranged between the aforementioned telecentric lens and the aforementioned LCD product with a cover plate, for adjusting the polarization direction of the aforementioned shooting light, wherein the aforementioned polarizing film may be tilted to the aforementioned LCD product with a cover plate, and in one embodiment, the tilt angle may be greater than 5°, thereby reducing the influence of the reflected light of the aforementioned polarizing film on the presentation, thereby avoiding the interference of stray light. It should be understood that the surface of the aforementioned polarizing film is a mirror surface, and when encountering light, mirror reflection will be generated. If the aforementioned polarizing plate is parallel to the aforementioned LCD product with a cover plate, when the shooting light passes through the aforementioned polarizing plate, part of the light can be mirror-reflected by the polarizing plate, and then directly enter the aforementioned telecentric lens to be imaged by the camera, which can ultimately cause the imaging contrast of the aforementioned surface dust and internal defects to decrease.

[0042] It can be understood that during detection, the rotation angle of the aforementioned polarizer is first adjusted so that the polarization direction of the aforementioned polarizer is parallel to the polarization direction of the polarizer layer of the aforementioned LCD module with a cover plate. At this time, when the aforementioned LCD module with a cover plate is photographed by a camera, the aforementioned point light source passes through the internal optical path of the telecentric lens to achieve vertical downward bright field lighting. The aforementioned light itself is a non-polarized light. After passing through the aforementioned polarizer, the aforementioned light becomes a first shooting light, wherein the polarization direction of the first shooting light is parallel to the polarization direction of the polarizer layer of the aforementioned LCD module with a cover plate. When the aforementioned first shooting light passes above the aforementioned cover glass layer, a part of the light will be reflected by the mirror into the aforementioned camera, and another part of the light can penetrate the aforementioned cover glass layer. At this time, if the surface of the aforementioned cover glass layer includes surface dust, the aforementioned light will be scattered and reflected in the area of ​​the aforementioned surface dust, and only a small amount of light will be reflected into the aforementioned camera. At this time, the aforementioned surface dust can be presented as a dark spot in the final presentation.

[0043] The first shooting light penetrating the cover glass layer can continue to propagate downward to the polarizing film layer. Since the polarization direction of the first shooting light is parallel to the polarization direction of the polarizing film layer of the LCD module with cover, the first shooting light can penetrate the polarizing film. If the surface of the polarizing film layer includes internal defects, the light will be scattered and reflected in the area of ​​the internal defects. Therefore, the light in this area cannot penetrate the polarizing film layer and propagate downward, and only a small amount of light is reflected into the camera. After penetrating the polarizing film, the first light can propagate to the top of the liquid crystal glass layer, and can be reflected by the liquid crystal glass layer to the camera, and finally the first photo can be obtained.

[0044] After obtaining the aforementioned first photo, by adjusting the rotation angle of the aforementioned polarizer, the polarization direction of the aforementioned polarizer is made perpendicular to the polarization direction of the polarizer layer of the aforementioned LCD module with a cover plate. At this time, when the aforementioned LCD module with a cover plate is photographed by a camera, the aforementioned point light source passes through the internal optical path of the telecentric lens to achieve vertical downward bright field lighting. The aforementioned light itself is a non-polarized light. After passing through the aforementioned polarizer, the aforementioned light becomes a second shooting light, wherein the polarization direction of the second shooting light is perpendicular to the polarization direction of the polarizer layer of the aforementioned LCD module with a cover plate. When the aforementioned first shooting light passes above the aforementioned cover glass layer, a part of the light will be reflected by the mirror into the aforementioned camera, and another part of the light can penetrate the aforementioned cover glass layer. At this time, if the surface of the aforementioned cover glass layer includes surface dust, the aforementioned light will be scattered and reflected in the area of ​​the aforementioned surface dust, and only a small amount of light will be reflected into the aforementioned camera. At this time, the aforementioned surface dust can be presented as a dark spot in the final presentation.

[0045] The second shooting light that penetrates the cover glass layer can continue to propagate downward to the polarizing film layer. Since the polarization direction of the first shooting light is perpendicular to the polarization direction of the polarizing film layer of the LCD module with cover at this time, the second shooting light cannot penetrate the polarizing film, resulting in no light on the liquid crystal glass layer being mirror-reflected into the camera. In the final imaging, only the cover glass layer and the surface dust can be presented.

[0046] Figure 7 Schematic diagrams showing other embodiments of the present application of using a polarizing film to take pictures of an LCD module with a cover plate, wherein the aforementioned LCD module with a cover plate may include a cover plate LCD product. Taking pictures of the aforementioned LCD module with a cover plate may include using a camera, a telecentric lens, a light source and a polarizing film, wherein the aforementioned camera may be connected to the aforementioned telecentric lens, and the aforementioned polarizing film may be arranged between the aforementioned light source and the aforementioned telecentric lens. Specifically, the aforementioned light source may include a point light source, and the aforementioned polarizing film housing may be attached to the light emitting surface of the aforementioned point light source. By rotating the aforementioned point light source, the polarization angle may be adjusted. By arranging the polarizing film between the aforementioned point light source and the aforementioned telecentric lens, the problem of imaging differences caused by arranging a polarizing film between the aforementioned telecentric lens and the aforementioned LCD with a cover plate may be avoided, and the clarity and contrast of the imaging of the aforementioned surface dust and internal defects may be improved.

[0047] Figure 8 A schematic diagram of using a polarization beam splitter prism to photograph an LCD module with a cover plate in some embodiments of the present application is shown, wherein the aforementioned LCD module with a cover plate may include a cover plate LCD product, and photographing the aforementioned LCD product with a cover plate may include using a camera, a telecentric lens and a light source.

[0048] In some embodiments, the polarizing device may include a polarizing plate or a polarizing beam splitter prism, wherein the polarizing plate is located between the light source and the telecentric lens or between the telecentric lens and the LCD module with a cover plate, and the polarizing beam splitter prism is located inside the telecentric lens. In some embodiments, by arranging the polarizing plate between the light source and the telecentric lens or between the telecentric lens and the LCD module with a cover plate, only light waves vibrating in a specific direction can be allowed to pass.

[0049] In some embodiments, the polarizing device may include a polarizing beam splitter prism, wherein the polarizing beam splitter prism may be located inside the telecentric lens. Specifically, the beam splitter prism of the telecentric lens may be replaced with a polarizing beam splitter prism, and the polarization angle of the light may be adjusted by rotating the lens along the normal line at an angle. During the shooting process, the light emitted from the point light source passes through the polarizing beam splitter prism to obtain polarized light, and then the polarization angle of the light is adjusted by rotating the lens along the normal line at an angle. Thus, a polarization direction perpendicular to the polarizer layer and a polarization direction parallel to the polarizer layer may be obtained, and finally the first photo and the second photo may be obtained. In one embodiment, the rotation angle of the rotating lens may be adjusted by rotating the locking screw.

[0050] FIG9 (a) shows an exemplary imaging diagram of an LCD module with a cover plate in some embodiments of the present application, including internal foreign matter and surface dust. As shown in the figure, when the first shooting light propagates above the aforementioned cover glass layer, a part of the light will be reflected by the mirror into the aforementioned camera, and another part of the light can penetrate the aforementioned cover glass layer and continue to propagate downward to the polarizing film layer. Since the polarization direction of the first shooting light is parallel to the polarization direction of the polarizing film layer of the aforementioned LCD module with a cover plate at this time, the aforementioned first shooting light can penetrate the aforementioned polarizing film. After penetrating the aforementioned polarizing film, the light can be irradiated above the aforementioned glass layer. After receiving the aforementioned light, the aforementioned glass layer can reflect the light by the mirror into the aforementioned camera. In the aforementioned process, if the light encounters dust on the surface of the cover plate, scattered reflection will occur, so the light reflected into the aforementioned camera will be much less than the light reflected into the camera by the aforementioned cover glass layer and the liquid crystal glass layer. Therefore, in the final image, the aforementioned dust appears as a dark spot relative to other areas. If light encounters internal defects on the aforementioned polarizing layer, the light is scattered in this area and cannot continue to propagate downward. Therefore, no light is reflected by the aforementioned liquid crystal glass layer in this area, so a dark spot appears in the final image.

[0051] FIG9 (b) shows an exemplary imaging diagram of the LCD module with a cover plate in some embodiments of the present application, including dust on the surface. As shown in the figure, when the second shooting light reaches the upper part of the cover glass layer, part of the light will be reflected by the mirror to the camera, and the other part of the light can penetrate the cover glass layer and continue to propagate downward to the polarizing film layer. Since the polarization direction of the second shooting light is perpendicular to the polarization direction of the polarizing film layer of the LCD module with a cover plate at this time, the second shooting light cannot penetrate the polarizing film, so no light can propagate to the liquid crystal glass layer. At this time, no light is reflected from the liquid crystal glass layer, and no reflected light can pass through the foreign matter defect. Therefore, no light from the foreign matter defect can be reflected to the camera. The light in the camera is only the mirror reflection of the cover glass layer and the scattered reflection of the foreign matter on the surface. At this time, only the dust on the surface appears as a dark spot in the final imaging.

[0052] Based on the aforementioned FIG. 9( a ) and FIG. 9( b ), the dark spots in FIG. 9( a ) are removed from the dark spots in FIG. 9( b ), and the imaging dark spots of the internal defects can be obtained.

[0053] Fig.10 FIG. 1 is a schematic block diagram of an electronic device 1000 for distinguishing internal foreign matter and surface foreign matter of an LCD module with a cover plate according to an embodiment of the present application. Fig.10 As shown, the electronic device 1000 may include a processor 1010 and a memory 1020, wherein the processor 1010 and the memory 1020 communicate with each other via a bus. The memory 1020 stores a computer instruction for distinguishing the simulation of internal foreign matter and surface foreign matter of the LCD module with a cover plate. When the aforementioned computer instruction is executed by the processor 1010, the electronic device 1000 implements the method steps described in the above text in combination with the accompanying drawings: photographing the LCD module with a cover plate under different polarization directions of the shooting light to obtain a first photo and a second photo, wherein the first photo includes a first dark spot and the second photo includes a second dark spot; and comparing the first dark spot and the second dark spot to distinguish the internal foreign matter and / or the surface foreign matter of the LCD module with a cover plate.

[0054] According to the above description in combination with the accompanying drawings, those skilled in the art can also understand that the embodiments of the present application can also be implemented by a software program. Therefore, the present application also provides a computer-readable storage medium. The computer-readable storage medium stores computer-readable instructions for distinguishing foreign objects in an LCD module with a cover plate. When the computer-readable instructions are executed by one or more processors, the present application in combination with the accompanying drawings can be implemented. Figure 1 A simulation method for distinguishing foreign matter from an LCD module with a cover plate is described.

[0055] The computer-readable storage medium may be any suitable magnetic storage medium or magneto-optical storage medium, such as Resistive Random Access Memory (RRAM), Dynamic Random Access Memory (DRAM), Static Random Access Memory (SRAM), Enhanced Dynamic Random Access Memory (EDRAM), High-Bandwidth Memory (HBM), Hybrid Memory Cube (HMC), etc., or any other medium that can be used to store the required information and can be accessed by the application, module, or both. Any such computer storage medium may be part of the device or accessible or connectable to the device. Any application or module described in the present invention may be implemented using computer-readable / executable instructions that may be stored or otherwise maintained by such a computer-readable medium.

[0056] It should also be understood that any module, unit, component, server, computer, terminal or device that executes instructions of the present invention examples may include or otherwise access computer-readable media, such as storage media, computer storage media or data storage devices (removable and / or non-removable) such as disks, optical disks or tapes. Computer storage media may include volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules or other data.

[0057] In summary, the LCD module with a cover plate is photographed under different shooting light polarization directions to obtain a first photo and a second photo, wherein the first photo includes a first dark spot and the second photo includes a second dark spot; and the first dark spot and the second dark spot are compared to distinguish internal foreign matter and / or surface foreign matter of the LCD module with a cover plate, thereby improving the accuracy and efficiency of detecting foreign matter.

[0058] Although multiple embodiments of the present application have been shown and described herein, it is obvious to those skilled in the art that such embodiments are provided only by way of example. Those skilled in the art can think of many changes, modifications and alternatives without departing from the thought and spirit of the present application. It should be understood that in the process of practicing the present application, various alternatives to the embodiments of the present application described herein can be adopted. The attached claims are intended to limit the scope of protection of the present application, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A method for distinguishing foreign matter from an LCD module with a cover plate, characterized in that: The LCD module with a cover plate comprises: a liquid crystal glass layer and a polarizing layer disposed on the liquid crystal glass layer, the cover plate is located above the polarizing layer, the foreign matter comprises internal foreign matter and surface foreign matter, and the method comprises: Taking photos of the LCD module with the cover plate under different shooting light polarization directions to obtain a first photo and a second photo, wherein the first photo includes a first dark spot and the second photo includes a second dark spot; The first dark spot is compared with the second dark spot to distinguish internal foreign matter and / or surface foreign matter of the LCD module with a cover plate.

2. The method according to claim 1, characterized in that The method of photographing the LCD module with the cover plate under different shooting light polarization directions to obtain the first photo and the second photo comprises: Adjusting the polarizing device to obtain a first shooting light, wherein the polarization direction of the first shooting light is parallel to the polarization direction of the polarizing film layer of the LCD module with the cover plate; Based on the first shooting light, photograph the LCD module with the cover plate to obtain a first photo; Adjusting the polarizing device to obtain a second shooting light, wherein the polarization direction of the second shooting light is perpendicular to the polarization direction of the polarizing film layer of the LCD module with the cover plate; Based on the second shooting light, the LCD module with the cover is photographed to obtain a second photo.

3. The method according to claim 1, characterized in that Comparing the first dark spot with the second dark spot to distinguish internal foreign matter and / or surface foreign matter of the LCD module with a cover plate includes: Determining a relationship between the first dark spot and the second dark spot, wherein the relationship includes a position relationship and a shape relationship; If the relationship between the first dark spot and the second dark spot is the same, it is a surface foreign body; If the relationship between the first dark spot and the second dark spot is different, it is an internal foreign matter.

4. The method according to claim 2, characterized in that: Taking a picture of the LCD module with the cover plate includes: using a camera and a telecentric lens to ensure the stability of image magnification, thereby improving the accuracy and reliability of shooting.

5. The method according to claim 4, characterized in that It also includes a light source for cooperating with the telecentric lens to achieve bright field lighting.

6. The method according to claim 5, characterized in that The polarization device includes a polarizer or a polarization beam splitter prism, wherein the polarizer is located between the light source and the telecentric lens or between the telecentric lens and the LCD module with a cover plate, and the polarization beam splitter prism is located inside the telecentric lens.

7. The method according to claim 3, characterized in that Determining the position relationship includes: Obtaining first coordinates of the first dark spot in the first photo; Obtaining second coordinates of the second dark spot in the second photo; Determine the first coordinate and the second coordinate; If the first coordinate and the second coordinate are equal, then the positional relationship between the first dark spot and the second dark spot is the same; If the first coordinate and the second coordinate are not equal, the positional relationship between the first dark spot and the second dark spot is different.

8. The method according to any one of claims 1 to 7, characterized in that The surface foreign matter includes surface dust, which is located on the cover plate, and the internal foreign matter includes internal foreign matter defects, which are located on the polarizer layer.

9. An electronic device for distinguishing internal foreign matter and surface foreign matter of an LCD module with a cover plate, characterized in that: include: processor; as well as A memory storing computer instructions for distinguishing internal foreign matter and surface foreign matter of an LCD module with a cover plate, wherein when the computer instructions are executed by a processor, the method according to any one of claims 1 to 8 is implemented.

10. A computer-readable storage medium, characterized in that: Computer program instructions for distinguishing internal foreign matter and surface foreign matter of an LCD module with a cover plate are stored thereon, and when the computer program instructions are executed by one or more processors, the method according to any one of claims 1-8 is implemented.

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