A Vision System for Dot Defect and Uniformity Automatic Inspection on LCD
| Autor: | Chih-Chung Chen, 陳志忠 |
|---|---|
| Rok vydání: | 2001 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 89 The liquid crystal displays (LCD) are the leading contenders to replace the cathode ray tube (CRT) displays. Larger displays with higher resolutions will only be possible if the pixel can be kept smaller and brighter. In order to achieve a higher picture performance, the technology of the inspection and the measurement is more important and more difficult for LCD. In most manufactories, some performances on LCD are generally examined by human eyes to check the chromaticity, luminance, viewing-direction, uniformity, etc., and this cause much time and higher cost. In this study, an automatic inspection system with a digital image analysis was developed to replace the manual inspection, which include CCD, image interface, linear encoders and linear moter. The main function is to measure the dot defect for checking the pixels under control and to calculate the brightness uniformity of LCD panel. The positioning technique, the grabbing skill on LCD, the image processing, and a virtual “+” marking algorithm to search the dot defect were constructed in this measuring system. The highest inspection speed on LCD panel could be successfully achieved thirty frames per second. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|