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Automatic defect optical inspection method of display screen

A technology of automatic optical detection and display screen, which is applied in the direction of optical testing for flaws/defects, material analysis through optical means, and measuring devices. The effect of customer satisfaction

Inactive Publication Date: 2019-04-26
苏州佳智彩光电科技有限公司
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  • Application Information

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Problems solved by technology

[0004] The invention provides an automatic optical detection method for defects of a display screen, the purpose of which is to solve the problem of high misjudgment rate in the prior art

Method used

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  • Automatic defect optical inspection method of display screen

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Experimental program
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Effect test

Embodiment

[0023] Embodiment: A test system that supports multiple working modes of OLED screens

[0024] See attached figure 1 , follow these steps:

[0025] In the first step, an automatic optical inspection image of a display screen is read in.

[0026] In the second step, the collected AOI (automatic optical inspection) image data is cut out for the ROI area to obtain the image data to be inspected.

[0027] In the third step, the image to be detected is evenly divided into sub-images with a size of S*S, and the number of effective sub-images is: where N sh and N sw Respectively represent the number of effective sub-images along the height and width directions of the image, H is the height of the image, and W is the width of the image.

[0028] In the fourth step, each sub-image is equally divided into N*N parts.

[0029] The 5th step, set current sub-image as Aij, the calculation formula of this current sub-image feature quantity is Where (i, j) represents the subscript of ...

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Abstract

The invention discloses an automatic defect optical inspection method of a display screen. The method comprises the steps of reading in automatic optical inspection images; conducting ROI area clipping on the automatic optical inspection images to obtain to-be-inspected images; dividing the to-be-inspected images into subimages with the size of S*S; equally dividing each subimage into N*N parts; conducting convolution calculation on the subimages to obtain the statistical characteristic value of each subimage gray difference; calculating the average value and the standard deviation of all thesubimage gray differences according to the statistical characteristic values of the gray differences of the current subimages; calculating upper limit values and lower limit values of self-adaptationthreshold values of the subimage gray differences of the images according to the average value and the standard deviation; comparing the statistical characteristic values of the gray differences of the current subimages with the upper limit values and the lower limit values; if the statistical characteristic values of the subimage gray differences of the current subimages are larger than the upperlimit values or larger than the lower limit values, judging that the current subimages are defective.

Description

technical field [0001] The invention belongs to the field of optoelectronics, and in particular relates to a testing method of a display screen, in particular to a defect automatic optical detection method of a display screen. Background technique [0002] As far as the inventor knows, the resolution of the traditional detection method based on edge contrast is not high. If the resolution is increased, each sub-pixel on the display panel will be photographed, thereby obtaining some texture pictures of pixel distribution. The edge contrast is also relatively strong, and the traditional algorithm cannot distinguish whether the area with high edge contrast is a texture or a defect, resulting in a high probability of misjudgment. [0003] In view of this, in order to solve this problem, it is the subject of the present invention to propose an automatic optical detection method for defects of a display screen. Contents of the invention [0004] The invention provides an automa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88
CPCG01N21/8851G01N2021/8887
Inventor 不公告发明人
Owner 苏州佳智彩光电科技有限公司
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