Printable TFT Technologies for Electronic Paper

Abstract

We have developed a high resolution printing method based on offset printing, which enables high resolution printing on a large area using silver nanoparticle ink. A thin-film-transistor (TFT) with a short channel length below 10μm was successfully obtained. Furthermore, we have successfully fabricated 11 inch diagonal organic TFT arrays with high precision entirely by printing processes. The fully-printed organic TFT exhibited the mobility and on/off ratio of 0.4cm²/Vs and 1.1×10⁹, respectively. We also discuss the uniformity of 300 transistors within 2 inch diagonal area. Electrical characteristics of the TFTs were investigated in detail. These technologies have been successfully applied to demonstrate an 11 inch VGA flexible active-matrix display driven by a printed organic TFT backplane.