WO2013078708A1 - Automatic optical detection method and automatic optical detection device - Google Patents

Abstract

The present invention relates to an automatic optical detection method and automatic optical detection device, the automatic optical detection method comprising the following steps: color light projection step, uniformly projecting the three primary colors of light on an object to be detected, and forming an image with different colors; obtaining the gray scale information corresponding to different areas of the image, and then generating a standard image for automatic optical inspection; and comparing the standard image for automatic optical inspection with a pre-stored reference image. The present invention only needs to process the grey scale information of the image, thus reducing the data volume and the processing difficulty of an image processing unit and a statistical analysis unit, and improving data acquisition reliability, precision, repeatability and speed. The present invention reduces the requirements on the detection device, thus facilitating the reduction of detection device input cost.

Description

 Automatic optical detecting method and optical automatic detecting device

 [Technical Field]

 The present invention relates to an automatic optical detecting method, and more particularly to an automatic optical detecting method and an optical automatic detecting device applied to a Thin Film Transistor Liquid Crystal Display (TFT-LCD).

【Background technique】

 At present, the automatic optical inspection (AOI) system of the TFT-LCD industry uses the graphic contrast algorithm for detection, that is, through high-definition camera technology, image analog-to-digital conversion technology, data image processing analysis technology, and computer automation. Control techniques and test results statistics analyze the image. However, this system requires the use of expensive AOI equipment, which is costly. At the same time, due to the use of image contrast technology, the amount of information generated by digital-to-analog conversion of images is larger, which has a greater negative impact on graphics processing.

[Summary of the Invention]

 In view of the above, it is necessary to provide an automatic optical inspection method and an optical automatic inspection apparatus which are simple and low in cost.

 An automatic optical detection method, the automatic optical detection method comprising the following steps:

 A: a color light projection step, using light having three primary colors to be projected on the object to be inspected, and the light is superimposed by space to form an image having different colors; acquiring grayscale information corresponding to different regions of the image, generating according to grayscale information Automatic optical inspection standard image of the object;

 B: The automatic optical inspection standard image is compared with the pre-stored reference image.

 Preferably, each of the color lights has 256 gray scale levels.

 Preferably, in the step A, the gray level information corresponding to different regions of the image is acquired by using a reflected light method.

Preferably, in the step A, the ash corresponding to different regions of the image is obtained by using a transmitted light method. Order information.

 An automatic optical detection method for a liquid crystal substrate, the automatic optical detection method comprising the following steps:

A: a color light projection step, using light having three primary colors of light projected onto the liquid crystal substrate to be inspected, the light is superimposed by space to form an image having different colors; acquiring grayscale information corresponding to different regions of the image, according to grayscale information Generating an automatic optical inspection standard image of the liquid crystal substrate;

 B: The automatic optical inspection standard image is compared with the pre-stored reference image.

 Preferably, each of the color lights has 256 gray scale levels.

 Preferably, in the step A, the gray level information corresponding to different regions of the image is acquired by using a reflected light method.

 Preferably, in the step A, the gray scale information corresponding to different regions of the image is acquired by using a transmitted light method.

 Preferably, the liquid crystal substrate comprises an array substrate and a color filter.

 Preferably, different regions on the side of the color filter include a black matrix, interstitial particles, and a region i corresponding to the flat layer.

 An optical automatic detecting device, comprising: a photographing device for acquiring gray scale information of an image of an object to be inspected, and an arithmetic module connected to the photographing device for receiving the gray scale information to generate an automatic optical detection standard image.

 Preferably, the optical automatic detecting device further comprises a three primary color projection device.

The above-mentioned automatic optical detection method is projected on the object to be inspected by the three primary colors of light and light, and the different areas of the object to be inspected are formed into images of different colors by the principle of spatial addition, and then the gray scale information of the image is acquired, and an automatic optical inspection is generated. Standard image. In the case where a defect occurs in the same area, the gray-scale information of the place is abnormal, so it is only necessary to compare the automatic optical inspection standard image with the pre-stored reference pattern to find the image area of the gray-scale anomaly to find the defect and The location of the defect. The invention reduces the data volume and processing difficulty of the image processing unit and the statistical analysis unit, and reduces the reliability, accuracy, repeatability and speed of data acquisition, and the invention reduces the detection device. The requirements also help to reduce the input cost of the testing equipment. [Description of the Drawings]

 1 is a schematic view showing an image formed by a reflected light method of a first preferred embodiment of the automatic optical detecting method of the present invention;

 2 is a schematic view showing an image formed by a transmitted light method of a first preferred embodiment of the automatic optical detecting method of the present invention;

 3 is a schematic diagram showing spatial superimposition imaging of three primary colors of the automatic optical detecting method of the present invention; and FIG. 4 is a schematic diagram of three primary color optical coordinates of the automatic optical detecting method shown in FIG.

【detailed description】

 The invention will now be further described with reference to the drawings and preferred embodiments.

 An optical automatic detecting apparatus of the present invention includes a photographing apparatus that acquires gray scale information of an image of an object to be inspected, and an arithmetic module that receives the gray scale information to generate an automatic optical detection standard image. The automatic optical detecting method of the optical automatic detecting device can be applied to the detection of a liquid crystal substrate, a surface mounted technology (SMT), or the like. In the present embodiment, the liquid crystal substrate to be applied is exemplified.

 The fabrication process of the TFT-LCD includes an array process (Array) and a color filter process (Color Filter, CF, color filter), and the patterns in the array process and the color film process are multi-layered, and each layer of the pattern is It is different. Taking the CF process as an example, the patterns of different regions on the CF side are different. For example, the black matrix (BM), the interstitial particles (PS), and the flat layer (Over Coat) have different sizes and heights. .

 The automatic optical detecting method of the present invention takes an example of detecting a color filter of a liquid crystal panel, and includes the following steps:

A1 : Shade projection step. The three primary colors are projected onto the color filter, and the light is spatially superimposed to make the images into images of different colors, and a new color is formed where the rays overlap each other. As shown in Figure 3, the spatially superimposed image has red, blue, and green Color, yellow, white, fuchsia and blue-green, etc., in which yellow, white, purple, and blue-green are formed by superimposing light.

 Of course, by changing the intensity of the three primary colors, a series of intermediate colors can be obtained where the light is superimposed, such as red-orange, orange-red, orange, orange, yellow-orange, yellow, yellow-green, green-yellow, and the like. When green light is mixed with blue light, the background can present a series of intermediate colors between green and blue. The blue light is mixed with the red light to obtain a series of intermediate colors between blue and red. As long as the proportions of the primary colors are properly matched, the red light and the green light are mixed to obtain a yellow color, and the green light and the blue light are mixed to obtain a blue color.

 In this step, the color light projection may be performed by a reflection method or a transmission method; the gray scale has 256 levels, that is, each gray scale information is data for one byte. See Figure 1 for the image effect of the reflection method. The image quality formed by the reflected light method is softer, brighter and more scattered. The image effect of the transmission method is shown in Figure 2. The image formed by the transmitted light method is rich in transition and delicate. , soft, and with three-dimensional changes.

 A2: The grayscale information corresponding to different regions of the image is obtained by the high-definition camera, and an automatic optical inspection standard image of the color filter is generated according to the grayscale information.

 B: The automatic optical inspection standard image is compared with the pre-stored reference image.

 It can be understood that the automatic optical detection method can also be used in the SMT field to perform quality monitoring and inspection on solder paste printing, placement machine mounting, reflow soldering, wave soldering and the like in the SMT production process. For example, it is possible to detect less tin, tin or misalignment of the solder paste.

 In summary, the automatic optical detection method of the present invention uniformly projects the three primary color light (R/G/B) light on the formed image, and uses the spatial addition principle to obtain a standard image, thereby reducing the cost of using the AOI device. At the same time, the data volume and processing difficulty of the image processing unit and the statistical analysis unit are reduced, which is beneficial to the reliability, accuracy, repeatability and speed of data acquisition.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention. A skilled person can utilize the techniques disclosed above without departing from the scope of the present invention. Equivalent embodiment of the teachings to make a few changes or modifications to equivalent variations, but without departing from the teachings of the present invention

Both the modification and the modification are still within the scope of the technical solution of the present invention.

Claims

Rights request 1. An automatic optical detection method comprising the following steps:  A: a color light projection step, using light having three primary colors to be projected on the object to be inspected, and the light is superimposed by space to form an image having different colors; acquiring grayscale information corresponding to different regions of the image, generating according to grayscale information Automatic optical inspection standard image of the object; B: The automatic optical inspection standard image is compared with the pre-stored reference image. The automatic optical detecting method according to claim 1, wherein each of said color lights has 256 gray scale levels.  The automatic optical detection method according to claim 1, wherein in the step A, grayscale information corresponding to different regions of the image is acquired by using a reflected light method.  The automatic optical detecting method according to claim 1, wherein in the step A, the gray scale information corresponding to different regions of the image is acquired by using a transmitted light method.  5. An automatic optical detection method for a liquid crystal substrate, comprising the steps of:  A: a color light projection step, using light having three primary colors of light to be projected on the liquid crystal substrate to be inspected, and the light is superimposed by space to form an image having different colors; acquiring grayscale information corresponding to different regions of the image, according to grayscale information Generating an automatic optical inspection standard image of the liquid crystal substrate;  B: The automatic optical inspection standard image is compared with the pre-stored reference image. The automatic optical detecting method of a liquid crystal substrate according to claim 5, wherein each of the color lights has 256 gray scale levels.  The automatic optical detecting method for a liquid crystal substrate according to claim 5, wherein in the step A, the gray scale information corresponding to different regions of the image is acquired by using a reflected light method.  The automatic optical detecting method for a liquid crystal substrate according to claim 5, wherein in the step A, the gray scale information corresponding to different regions of the image is acquired by a transmitted light method. 9. The method of automatically optically detecting a liquid crystal substrate according to claim 5, wherein The liquid crystal substrate includes an array substrate and a color filter.  10. The method of automatically optically detecting a liquid crystal substrate according to claim 9, wherein: the different regions on the side of the color filter include a black matrix, interstitial particles, and a region i corresponding to the flat layer.  An optical automatic detecting device, comprising: a photographing device that acquires gray scale information of an image of an object to be inspected, and an arithmetic module connected to the photographing device for receiving the gray scale information to generate an automatic optical detection standard image .  12. An optical automatic detecting apparatus according to claim 11, wherein said optical automatic detecting apparatus further comprises three primary color projection means.