A Compact Low-Power Shunt Proximity Touch Sensor and Readout for Haptic Function

Abstract

Abstract-This paper presents a compact and lowpower on-chip touch sensor and readout circuit using shunt proximity touch sensor and its design scheme. In the proposed touch sensor readout circuit, the touch panel condition depending on the proximity of the finger is directly converted into the corresponding voltage level without additional signal conditioning procedures. Furthermore, the additional circuitry including the comparator and the flip-flop does not consume any static current, which leads to a lowpower design scheme. A new prototype touch sensor readout integrated circuit was fabricated using complementally metal oxide silicon (