Abstract
This paper presents an ultra-low power hand gesture sensor using electrostatic induction for mobile devices. Two electrodes, which consist of electret foils stacked on metal sheets, are used to recognize two gestures such as hand movements from left to right and right to left. The hand gesture recognition is realized by detecting the electrostatic induction currents induced by hand movements. However, the electrostatic induction currents are significantly small; hence, a hand gesture recognition chip is first designed in this study to amplify and detect the small electrostatic induction currents with low power. This chip is fabricated in a commercial 180 nm complementary metal oxide semiconductor (CMOS) process, and the measurement results indicate that the fabricated gesture recognition chip consumes 406 nW, which is less than 1/100th of the power dissipation of conventional gesture sensors.
Highlights
User interfaces using hand gestures are promising, because they provide users with more convenient controllability than touch interfaces, which are widely used in mobile devices, such as smartphones and smart speakers
To detect such a small current with low power, we propose an ultra-low power amplifier and a comparator with a bias voltage generator, which are optimally designed for electrostatic induction (ESI)-based gesture sensing in this paper
To implement gesture sensing in mobile devices, low-power gesture sensors are required because mobile devices are battery-operated
Summary
User interfaces using hand gestures are promising, because they provide users with more convenient controllability than touch interfaces, which are widely used in mobile devices, such as smartphones and smart speakers. The conventional sensors can detect more gestures than the sensor proposed in this study, whereas they are not intended to be implemented in mobile devices; the power consumed to recognize hand gestures is not considered. Another technique to detect hand motion using electrostatic induction is proposed in [12,13]. These materials are commercially available, and fabrication of the sensing electrode is not discussed in this paper.
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