A method for detecting white dot defect of light guide plate

Abstract

A method for detecting white point defect of light guide plate. A light guide plate is partitioned according to the density of light point, different parameters are adopted for different area processing algorithm, and adjustment parameters such as area and eccentricity are set, so that white point defect required by manufacturer can be detected automatically and the adaptability is strong. The invention not only can detect the sparse area in the light guide plate, but also can accurately judge the small white dots in the dense area, and the detection accuracy is high. The algorithm of the invention can detect different types of light guide plates, and has good stability and wide application range. The invention has the advantages of simple algorithm, high efficiency, short processing timeof the light guide plate image, and conforms to the actual requirements of enterprises. In addition, the invention can realize full automatic detection only by properly adjusting a few parameters, andis convenient to operate and maintain.

Description

technical field [0001] The invention relates to a detection method of a light guide plate, in particular to a detection method of a white point defect of a light guide plate. Background technique [0002] Light Guide Plate (LGP) is made of optical-grade acrylic / PC plate, and then using high-tech materials with high reflectivity and non-absorbing light, engraving with V-shaped cross grid on the bottom surface of the optical-grade acrylic plate, laser Engraving and UV screen printing technology to print light guide points. With the advantages of thinness, no pollution, and good light transmission, the light guide plate has been widely used in the fields of liquid crystal display, X-ray, mobile phone display, etc. However, as an industrial product, the light guide plate inevitably exists Defects, such as white point defects. The so-called white point defect is actually a point where the brightness of the light guide point in a local area is significantly higher than the brigh...

AI Technical Summary

Problems solved by technology

With the advantages of thinness, no pollution, and good light transmission, the light guide plate has been widely used in the fields of liquid crystal display, X-ray, mobile phone display, etc. However, as an industrial product, the light guide plate inevitably exists Defects such as white point defects

Although with the continuous improvement of industrial technology, the white point defects in the light guide plate have been gradually reduced, but the current industrial technology still cannot completely eliminate the white point in the light guide plate, so it is necessary to carry out the necessary whitening of the produced light guide plate products. Point defect detection

[0003] At present, domestic detection of light guide plate defects mainly relies on manual operation, but manual visual inspection cannot meet the actual requirements of enterprises in terms of detection accuracy and detection efficiency. In addition, manual methods are sensitive to environmental changes and cannot maintain long-term stability. Testing Standard

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