An IGZO TFT based in-cell capacitance touch sensor

Abstract

An in-cell active matrix capacitive touch sensor using IGZO TFT is proposed in this paper. The sensor does not need touch deformation, complicated detection mechanisms or extra components. In the sensor, touching events are identified as capacitive coupling between internal detection electrodes and touch objects. Then the coupling can be converted to voltage signal and amplified. TFT sizes are decreased for the high mobility and good uniformity of IGZO, which result in a significantly improved accuracy. A capacitance with the order of 1 fF caused by the coupling could be detected and converted to an adequate output voltage signal.

TCAD Simulation of Amorphous Indium-Gallium-Zinc Oxide Thin-Film Transistors

“…In the Connection level they present the already discussed advantages of being applicable in wide range of substrates, as flexible and transparent ones. Several applications have already been reported as gas sensors [10], touchpanels [11] and even biological sensors [12]. Integrated with the connection level, the technology can also be in the conversion level as they have performance that allow for the processing of the information received at the Connection level.…”