Abstract
In recent years, the LCD (liquid crystal display) panel technology has made great progress and gradually replaces the traditional CRT one. By some special design the panel can be embedded with photo-sensitive elements and becomes light input device too. In this study we investigate the possibility of using the light-pen to replace the conventional mouse functions. Light-pen has advantages over mouse by its non-contact and remote control characteristics, especially in pointing. But with single switch in light-pen, some functions need different approaches for reaching the same goal. Some software programs have been implemented to demonstrate the feasibilities.