A Defect Inspection Algorithm For LCD Touch Screen

Liquid Crystal Display (LCD) touch screen has been applied to many consumer electronic products, such as cell phone, PDA, GPS, etc. Because LCD touch screen has unique Indium Tin Oxide (ITO) pattern, there is no special defect inspection algorithm designed for LCD touch screen. However, the quality control of the LCD touch screen in the production line is very important to minimize costs and maximize product quality. This research will present algorithms used for ITO pattern defects inspection of LCDs touch screen. Here, a complete design and implementation of a sequence of algorithmic components to identify ITO pattern defects is described. A preliminary automatic defects inspection system based on the algorithms will be also introduced.