32-2: High-Speed Capacitive Touch Sensor with Pseudo-CMOS Buffer using a-IGZO TFTs on Plastic

Abstract

We propose a capacitive touch sensor with a-IGZO TFTs on plastic using pseudo-CMOS inverter as output buffer. Benefit from the pseudo-CMOS structure, the sensor achieves both high-speed and large output swing between touched/untouched state. This result demonstrates a novel approach to large area flexible touch sensing applications.