32.1: Invited Paper: Printing Technologies for Organic TFT Array for Electronic Paper

We have developed unique printing technologies for organic TFT (OTFT) array for electronic paper. Offset-based printing technique can achieve less than 5 μm channel length and electrode width with good alignment accuracy without any photoassisted process. Flexographic printing can realize extremely smooth surface of organic semiconductor (OSC), which is essential to achieve high mobility. By using these methods, characteristics of printed OTFT show remarkably high uniformity. Moreover, we have successfully driven E Ink electronic paper by fully printed OTFT array.