Polymer Lighting-Diode Defect Inspection System
| Autor: | Chia-Ming Chiang, 江嘉明 |
|---|---|
| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 91 The main stream of FPDs (Flat Panel Display) is currently LCDs (Liquid Crystal Display). However, LCDs have some shortcomings: slow response time, low viewing angle, requiring backlight. PLEDs (Polymer Light-Emitting Diode) do not have the above shortcomings. Hence, PLEDs would replace LCDs and become the main stream of next-generation FPDs. PLEDs use polymers, like the semiconductor material in LEDs (Light-Emitting Diode), which consist of large molecules. When electric current flows, combination the holes and electrons causes uniform emission of light throughout PLED panels. Because polymers are lightweight and flexible, they can be simply and inexpensively used for FPDs. They are full-spectrum color displays, and have high brightness at low drive voltages, glare-free viewing, self-luminance, and long operating lifetime. In this thesis, we use computer vision and digital image processing to detect defects of PLED panels in the production line early and improve production. This thesis has two parts: 1. low resolution defect inspection, 2. high resolution defect inspection. In low resolution defect inspection, we use CCD (Charge-Coupled Device) Camera to inspect defective blocks of PLED panels and replace photometer to measure luminance. In high resolution, we use CCD Camera and high resolution lens to grab image and detect defects based on computer vision and image processing. Because of high resolution, accuracy is important and we also calibrate our CCD camera and inspection device. The experimental result shows that our inspection system achieves high accuracy and high speed for industry and meets our requirement. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|