Perception and Recognition of Proximity and Contact Processes via Parallel Double-Transistor Configuration

Abstract

The explosive development and applications ofhuman-machine interaction technologies and products not only promote theexploration but also propose more severe requirements on flexible electronicsensors. A sensor integrated with both proximity and contact perceptionfunctions is highly expected for an intelligent robot to pre-evaluate positionand shape of an approaching target so as to perform appropriate grasping actionor pre-perceive obstacles for avoidance operation. Based on both electrostaticinduction and piezoelectric mechanisms, piezoelectric thin film transistorspossess both proximity and tactile perception functions. However, effectiverecognition of approach and contact processes is still challenging in a blindsensing condition. Here, a parallel double-transistor configuration with apiezoelectric capacitor as sensing end is put forward. Both transistors exhibitin-phase drain current response during approach process while out-of-phaseresponse during contact process, as is utilized to precisely detect andrecognize both processes. This parallel double-transistor configuration isfurther assembled onto a robotic claw to feedback control the claw when and howto grasp the target. This parallel double-transistor configuration provides afeasible and effective measure for piezoelectric transistors to detect anddistinguish both non-contact and contact processes.