CN211856404U

CN211856404U - Detection device for displaying images on module

Info

Publication number: CN211856404U
Application number: CN202020264649.5U
Authority: CN
Inventors: 张玉; 洪志坤; 张胜森
Original assignee: Wuhan Jingce Electronic Group Co Ltd; Wuhan Jingli Electronic Technology Co Ltd
Current assignee: Wuhan Jingce Electronic Group Co Ltd; Wuhan Jingli Electronic Technology Co Ltd; Wuhan Jingce Electronic Technology Co Ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-11-03
Anticipated expiration: 2030-03-05

Abstract

The utility model discloses a detection device for module display image, the detection light source includes a plurality of first sub-light sources that are located the module both sides that wait to detect, a plurality of first sub-light sources and wait to detect the height between the module the same, the direction of illumination of first sub-light source is on a parallel with the display screen of waiting to detect the module; the detection light source is still including being located a plurality of second sub-light sources that wait to detect the module both sides, a plurality of second sub-light source distance and wait to detect the height between the module the same, the second sub-light source with wait to detect the height that highly is higher than between the module first sub-light source and wait to detect the module, the direction of illumination perpendicular to of first sub-light source waits to detect the display screen of module, and simultaneously, the parallel mode is adopted to the illumination mode of low layer side light source, it is comparatively showing to defect detection effects such as dust, high-rise sidelight source is comparatively obvious to defect detection such as bubble, thereby with the dust that exists on the screen, the foreign matter detects well.

Description

Detection device for displaying images on module

Technical Field

The utility model belongs to the image detection field, concretely relates to a detection device for module display image.

Background

In the field of automatic detection of a flat plate appearance defect, defects such as dust and foreign matter generally exist between CG glass and liquid crystal molecules on the surface of a module, and defects such as foreign matter and dirt also exist on the surface of CG glass, so that when appearance detection is performed, foreign matter inside and outside the glass needs to be detected, and thus, a light source needs to be used for illumination. The screen is turned off, the side light source is turned on, particles on the screen are illuminated, and the dust picture is filtered before AOI detection is carried out, so that the defects of color cast, dark spots, bright spots and the like existing in the real screen can be confirmed.

In general, when a screen is lighted, a camera is used for shooting and detecting defects of the screen, but actually, the existence of foreign matters on the surface of a module can cause misjudgment, and the defects of a dust lamp can be mistakenly taken as defects on a screen circuit or abnormal deflection of liquid crystal molecules at the position during detection. In the field of automatic detection of a flat plate appearance defect, whether the defect is a real defect cannot be effectively distinguished, for example, cover plate glass (CG glass) needs to be attached to an upper polarizer or a screen, dust (particle) is easily clamped between the CG glass and the polarizer, and when the dust is in a micron level, a defect of attachment foreign matter is formed between the CG glass and the upper polarizer, and the defect of attachment foreign matter can cause defective products. And some external defects (such as dust, dirt and the like) can be removed through cleaning, and the quality is not influenced, so that the good products are judged by mistake.

The light source polishing mode is particularly important for defect detection, and directly influences the defect detection result. Patent document (CN107228864A) discloses a system for detecting surface defects of a display panel, which employs a multi-layer light source system, but since it mainly detects the pit defects of the display panel, when designing the light source, a parallel light source forms a specific included angle with the vertical direction of the lens, the light source in the second layer on the upper layer adjusts each light source in the light source assembly, so that the central light spot covers the detected display panel, the system mainly consists in making the pit defects of the display panel reflect into the area array camera, however, for the display panel, there is not only pit defects, but also dust contamination, if the light source has a specific included angle with the vertical direction of the lens, the contrast between the dust contamination defects and the background is not high, and there is a situation that the detection is not easy.

SUMMERY OF THE UTILITY MODEL

To prior art's above defect or improvement demand, the utility model provides a detection device for module display image, its placing method through first sub-light source and second sub-light source, light through upper and lower two-layer sidelight source, high-rise sidelight source is put and is being shielded center top vertical exposure, in order to be used for remedying the luminance of center department, can be even with whole screen illumination, and simultaneously, the illumination mode of low floor side light source adopts parallel mode, defect detection effect is more for showing such as dust, the contrast of dust with the background has been improved, high-rise sidelight source is comparatively obvious in defect detection such as bubble, thereby the dust that exists on will shielding, the foreign matter detects out better more comprehensively.

To achieve the above object, according to one aspect of the present invention, there is provided a detecting device for displaying an image on a module, the detecting device comprising a detecting camera and a detecting light source, the detecting camera is used for acquiring a line scan image of the module to be detected,

the detection light source comprises a plurality of first sub light sources and a plurality of second sub light sources positioned between the plurality of first sub light sources and the detection camera, the vertical distances between the plurality of first sub light sources and the detection camera are equal, and the vertical distances between the plurality of second sub light sources and the detection camera are equal;

the plurality of first sub-light sources are positioned on two sides above the display screen of the module to be detected when the first sub-light sources work, and the irradiation directions of the first sub-light sources are parallel to the display screen of the module to be detected; the irradiation directions of the second sub-light sources are perpendicular to the display screen of the module to be detected.

As a further improvement of the present invention, the first sub-light source is a bar light source or a line light source.

As a further improvement, a plurality of first sub-light sources are symmetrically arranged on two sides of the detection module.

As a further improvement of the present invention, the second sub-light source is located between the camera and the first sub-light source on the vertical plane.

As a further improvement of the present invention, the second sub-light source is a bar light source or a line light source.

As a further improvement, a plurality of second sub-light sources are symmetrically arranged on two sides of the detection module.

Generally, through the utility model discloses above technical scheme who conceives compares with prior art, has following beneficial effect:

the utility model discloses a detection apparatus for be used for module to show image, polish through upper and lower two-layer sidelight source, the illumination mode of low floor side light source adopts the parallel light illumination can make dirty and the contrast of background such as dust higher, defect detection effect such as dust is comparatively showing, simultaneously, because low floor side light source is higher and the luminance of center department is lower to the luminance of waiting to detect the screen both ends, put high-rise sidelight source in screen center top vertical irradiation this moment, in order to be used for remedying the luminance of center department, the luminance of whole screen is comparatively even like this, examine time measuring and more do benefit to the defect detection, and the mode of polishing of high-rise sidelight source is comparatively obvious to defect detection such as bubble, thereby with the dust that exists on the screen, the foreign matter detects well.

Drawings

Fig. 1 is a schematic diagram of a detection apparatus for displaying an image on a module according to an embodiment of the present invention;

throughout the drawings, like reference numerals are used to designate like elements or structures, and in particular: 1-detection camera, 2-high layer side light source (second sub light source), 3-low layer side light source (first sub light source) and 4-module to be detected.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to the following embodiments.

Fig. 1 is a schematic diagram of a detection apparatus for a module to display an image according to an embodiment of the present invention. As shown in FIG. 1, a detecting device for displaying images on a module comprises a detecting camera and a detecting light source, wherein the detecting camera is used for acquiring line scanning images of the module to be detected,

The detection step of the device comprises the following steps:

lighting a detection light source and closing a module to be detected, and acquiring a first line scanning image of the module to be detected by using a detection camera; turning off the detection light source, lighting the module to be detected, and acquiring a second linear scanning image of the module to be detected by using the detection camera; comparing the first linear scanning image with the second linear scanning image to realize defect detection of the module to be detected;

comparing the first line scan image with the second line scan image specifically comprises:

and subtracting the gray scale value of each pixel point of the first linear scanning image B from the gray scale value of each pixel point of the second linear scanning image B to obtain a third linear scanning image, wherein the defect of the third linear scanning image is detected to be the detection defect of the module to be detected.

As a preferred embodiment, the first sub-light source is a bar light source or a line light source.

As a preferred embodiment, a plurality of first sub-light sources are symmetrically arranged on two sides of the module to be detected.

As a preferred embodiment, the second sub-light source is located between the camera and the first sub-light source in the vertical plane.

As a preferred embodiment, the second sub-light source is a bar light source or a line light source.

As a preferred embodiment, a plurality of second sub-light sources are symmetrically arranged on two sides of the module to be detected.

Lighting a detection light source and closing a module to be detected, and acquiring a first line scanning image A of the module to be detected by using a detection camera; turning off the detection light source, lighting the module to be detected, and acquiring a second linear scanning image B of the module to be detected by using the detection camera; and comparing the first linear scanning image with the second linear scanning image to realize the defect detection of the module to be detected. As an example, the gray scale value of each pixel point on the first line-scanned image a and the second line-scanned image B may be subtracted to obtain a third line-scanned image C, the defect of the module to be detected may be obtained by detecting the defect of the third line-scanned image C, the defect in the third line-scanned image C represents the defect actually existing on the screen, as an example, the point defect is usually a single bright or dark point on the screen, the surface defect is usually an over-bright or over-dark point in a certain area, and the image of the bright screen is, for example, a G image, that is, a pure green image, but other colors than green are present on the image, such as a red patch, the defect is called a color cast defect, and is also a surface defect, and the point defect and the surface defect are different in the size of the area of the defect. Of course, the above-mentioned way of comparing the first line scan image and the second line scan image is only a simple example, and can be adjusted accordingly according to the requirements of different detection means and detection conditions.

As an example, the first sub light source is placed at the edge of the horizontal distance screen, and other positions may be performed as needed, the first sub light source and the screen are fixed at the same height position, the light sources at the two sides are symmetrically placed with the center of the screen as a symmetry axis, and the length of the light source may be longer than the long side of the screen or the wide side of the screen. When a bar light source is used, the divergence angle of the light source is large, but the luminance value of the light source is low, and the exposure time of the camera needs to be increased when detection is performed. The linear light source is used, the brightness value is high, the divergence angle is small, and the linear light source can be used for large screens or small screens. The closer the light source is placed to the screen, the better, the farther the light source is placed, the brightness value of the light source is reduced, and the exposure time of the camera is prolonged. As an example, the first sub-light sources may be placed one on each side of the left and right, the height and horizontal distance of the light sources from the tablet may be evaluated according to the divergence angle of the light sources used, each light source may be used to illuminate half of the screen if the size of the screen is larger, and each light source may be made to illuminate the entire screen if the size of the screen is smaller, in a manner equivalent to the former, which provides more uniform illumination, and the first sub-light sources may be placed on both sides of the long side of the screen, which provides the advantage of using line light sources with smaller divergence angles.

As an example, the second sub-light source is placed at the edge of the horizontal distance screen, and other positions can be performed according to needs, for example, the second sub-light source is located between the camera and the first sub-light source on the vertical plane, because the lower layer side light source has higher brightness for the two ends of the screen to be detected and lower brightness in the center, the higher layer side light source is placed above the center of the screen to vertically irradiate so as to compensate the brightness in the center, so that the brightness of the whole screen is more uniform, the defect detection is facilitated during detection, and the lighting mode of the higher layer side light source is more obvious for defect detection such as bubbles, so that dust and foreign matters existing on the screen are well detected. The second sub-light sources are fixed at the same height position with the screen, the light sources at the two sides are symmetrically arranged by taking the center of the screen as a symmetry axis, and the length of the light sources can be longer than the long edge of the screen or the wide edge of the screen. When a bar light source is used, the divergence angle of the light source is large, but the luminance value of the light source is low, and the exposure time of the camera needs to be increased when detection is performed. The linear light source is used, the brightness value is high, the divergence angle is small, and the linear light source can be used for large screens or small screens. The closer the light source is placed to the screen, the better, the farther the light source is placed, the brightness value of the light source is reduced, and the exposure time of the camera is prolonged. As an example, the second sub-light sources may be placed one on each side of the left and right, the height and horizontal distance of the light sources from the tablet may be evaluated according to the divergence angle of the light sources used, each light source may be used to illuminate half of the screen if the size of the screen is larger, and each light source may be made to illuminate the entire screen if the size of the screen is smaller, in a manner equivalent to the former, which provides more uniform illumination, and the second sub-light sources may be placed on both sides of the long side of the screen, which provides the advantage of using line light sources with smaller divergence angles.

The side light sources are symmetrically arranged on two sides of the screen only to enable the brightness of the screen to be uniform, so that dust and foreign matters existing on the screen can be well detected, but the light sources can still illuminate even if the light sources are asymmetrically arranged and defect detection is not influenced, the positions of the light sources are not fixed and only aim at the screens with different sizes, because the divergence angle of the light sources is limited, the height and the horizontal position of the light sources can be adjusted according to requirements, under the condition of not influencing the uniformity of the screen, the closer the light sources are to the screens, the better the light intensity is, the defects such as dust and dirt are more favorably detected because the closer the light sources are to the screens, the larger the light intensity is, the more the defects such as dust and the like are detected, and meanwhile, the detection effect of the low-layer side light sources on the defects such as dust and the like is obvious through the mode of the first sub light sources and the second sub light, thereby distinguishing the defects in the image quality actually existing on the screen.

Setting a detection device according to the mode, lighting a detection light source and closing a module to be detected, and acquiring a first line scanning image A of the module to be detected by using a detection camera; turning off the detection light source, lighting the module to be detected, and acquiring a second linear scanning image B of the module to be detected by using the detection camera; and comparing the first linear scanning image with the second linear scanning image to realize the defect detection of the module to be detected. As an example, the gray scale value of each pixel point on the first line-scanned image a and the second line-scanned image B may be subtracted to obtain a third line-scanned image C, the defect of the module to be detected may be obtained by detecting the defect of the third line-scanned image C, the defect in the third line-scanned image C represents the defect actually existing on the screen, as an example, the point defect is usually a single bright or dark point on the screen, the surface defect is usually an over-bright or over-dark point in a certain area, and the image of the bright screen is, for example, a G image, that is, a pure green image, but other colors than green are present on the image, such as a red patch, the defect is called a color cast defect, and is also a surface defect, and the point defect and the surface defect are different in the size of the area of the defect. Of course, the above-mentioned way of comparing the first line scan image and the second line scan image is only a simple example, and can be adjusted accordingly according to the requirements of different detection means and detection conditions.

It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims

1. A detection device for displaying images on a module, the detection device comprises a detection camera and a detection light source, the detection camera is used for acquiring line scanning images of the module to be detected,

the detection light source comprises a plurality of first sub light sources and a plurality of second sub light sources positioned between the plurality of first sub light sources and the detection camera, wherein the vertical distances between the plurality of first sub light sources and the detection camera are equal, and the vertical distances between the plurality of second sub light sources and the detection camera are equal;

the plurality of first sub-light sources are positioned on two sides above the display screen of the module to be detected when the module to be detected works, and the irradiation directions of the plurality of first sub-light sources are parallel to the display screen of the module to be detected; and the irradiation directions of the plurality of second sub-light sources are perpendicular to the display screen of the module to be detected.

2. The detecting device for the module display image according to claim 1, wherein the first sub-light source is a bar light source or a line light source.

3. The detecting device for the module to display the image according to claim 1, wherein the plurality of first sub-light sources are symmetrically arranged at two sides of the module to be detected.

4. The detecting device for the module display image according to claim 1, wherein the second sub-light source is located between the camera and the first sub-light source on the vertical plane.

5. The detecting device for the module displayed image according to claim 1, wherein the second sub-light source is a bar light source or a line light source.

6. The detecting device for the module to display the image according to claim 1, wherein the plurality of second sub-light sources are symmetrically arranged at two sides of the module to be detected.