Automatic detection algorithm for TFT-LCD micro display defects

Aiming at the limitation of most TFT-LCD (Thin Film Transistor-Liquid Crystal Display) defect detection methods for micro defects, we propose an image registration method based on local template matching for implementing image registration in subpixel level. Then we propose a TFT-LCD micro defect detection algorithm based on the image substraction method and the subpixel image registration. With this method, we can detect TFT-LCD micro defects automatically. Application of this method to TFT-LCD array area detection and peripheral area detection shows that the rates of both miss and false detection are lower than 3% in array area, and are lower than 5% in peripheral area. Which can meet the detection requirement.