LCD general defect detecting method

A defect and overall technology, applied in the field of LCD defect detection, can solve problems such as single processing method

Active Publication Date: 2013-11-27
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In response to these defects, many researchers have proposed corresponding detection methods for the defects and made great contributions, but their processing methods are relatively simple, and they have not considered how to deal with the detection of all these defects at the same time.

Method used

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Experimental program
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Embodiment

[0148] This embodiment includes the following parts:

[0149] 1. Image preprocessing

[0150] Select image I1 of 7 good samples (non-defective samples) in white mode. Take I1 as the input and use the binarization function to perform the binarization operation to obtain I2, and then use I2 as the input to perform contour detection with the contour detection function. The innermost contour area obtained is the target area, the inner contour and the outer layer Between the outlines is a black border area. Calculate the mean, variance, maximum value, and minimum value of the gray value for the target area and the border area, respectively, and take the average V1 of the minimum value of the gray value of the target area of ​​the seven images and the maximum value of the black frame area The value V1+V2 / 2 in the middle of the average value of V2 (V1>V2) is used as the threshold value. Here, 32 is used to binarize the image Ix in the other white mode to be detected, and then extra...

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Abstract

The invention discloses an LCD general defect detecting method. The LCD general defect detecting method comprises the following steps of (1) carrying out preprocessing on images, (2) separating defects of images of a black and white mode, (3) determining point defects and line defects, (4) zooming grey mode images, (5) reestablishing images, (6) detecting point-shaped foreign body defects, (7) detecting area-shaped foreign body defects, and (8) detecting line-shaped foreign body detects. The LCD general defect detecting method carries out Gaussian smoothing on the images to remove noise, gradient values are then solved, edge points are determined preliminarily according to the gradient values, the edge position is finally located precisely in detail, and effects are made to be clearer.

Description

technical field [0001] The invention belongs to the field of defect detection of liquid crystal display screens, in particular to a method for detecting overall defects of LCDs. Background technique [0002] And it has fully replaced the bulky CRT display screen and occupied the display screen market. In particular, TFT-LCD (Thin Film Transistor), that is, thin film field effect transistor liquid crystal display, is currently the only display device that has fully caught up with and surpassed CRT in terms of brightness, contrast, power consumption, life, volume and weight. As the liquid crystal display market is booming, people pay more and more attention to the liquid crystal display industry, and testing, as an indispensable part of the production process, has also attracted the attention of many researchers at home and abroad. In order to replace the traditional manual detection methods, researchers began to seek new ways to design a practical automatic detection system....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50G06T7/00G01N21/956
Inventor 杨育彬高阳赵九洋
Owner NANJING UNIV
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