Maximizing responsiveness of touch sensing via charge multiplexing in touchscreen devices

This paper presents a novel touch sensing scheme for capacitive touchscreen devices that is capable of maximizing the responsiveness of touch sensing, thereby enabling the realization of high-speed/resolution touchscreens. The heart of our proposed scheme is to measure various combinations of channels of the touchscreen in a way to preserve orthogonality among channels, and to detect the presence of touch by decomposing the measurements into orthogonal components. After designing the measurement and detection algorithms in detail, we demonstrate via simulation that our proposed scheme indeed works.