Artificial Retina using Thin-Film Photodiode and Thin-Film Transistor

Abstract

An artificial retina using thin-film photodiodes (TFPDs) and thin-film transistors (TFTs) is proposed, which is an improvement of system-on-panel (SOP) concepts where in-pixel and pixel-to-pixel operations are executed using the TFTs. Device characteristics of the TFPD and TFTs are measured, and they are modeled into circuit simulation. Circuit configurations of a retina pixel and retina array are invented with some improvements, and they are designed. It is confirmed that the artificial retina can operate and achieve edge enhancement. Behavior tolerance against characteristic deviations of the TFTs and photo-sensitivity control of the edge enhancement are evaluated.