CMOS photo-transistor array detection system for visual light identification (ID)

Visible light communication is a wireless communication method modulating the light of visible LED. In this study, high sensitive photo-transistor array has been developed for the visible light identification(ID) using CMOS 0.35 μm process. The response sensitivity of photo-transistor is over 0.8 A/W. The photo-transistor is selected by the outer signal in order to separate the signals from multiple light sources. The image of light sources is scanned by CCD module, and the brightest position is determined by C++ software.