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A low voltage-powered soft electromechanical stimulation patch for haptics feedback in human-machine interfaces.

Wenying Qiu1, Junwen Zhong2, Tao Jiang1

  • 1Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen, 518055, China; Berkeley Sensor & Actuator Center, University of California at Berkeley, Berkeley, CA, 94720, USA; Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA, 94720, USA; Tsinghua Shenzhen International School, Tsinghua University, Shenzhen, 518055, China.

Biosensors & Bioelectronics
|September 20, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a soft haptic feedback system using electret films to create tactile sensations wirelessly at low voltages. This innovation enables untethered wearable devices for immersive applications like augmented reality and virtual reality.

Keywords:
Haptics feedbackHuman-machine interfaceSoft actuatorWearable electronics

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Human-Computer Interaction

Background:

  • Developing wireless, low-voltage haptic interfaces for human-machine interaction remains a significant challenge.
  • Existing technologies often lack the thin, soft, and comfortable form factor required for seamless integration into wearable devices.

Purpose of the Study:

  • To propose and demonstrate a novel soft haptic feedback system capable of electromechanically stimulating skin sensations wirelessly.
  • To achieve tactile feedback using a low driving voltage suitable for wearable applications.

Main Methods:

  • Utilized highly charged, polymeric electret films with an annulus-shape bump structure to generate mechanical sensations.
  • Developed a 3x3 actuator array for transmitting patterned haptic information, including letters and numbers.
  • Integrated flexible lithium batteries and a flexible circuit board to create an untethered stimulation patch.

Main Results:

  • Successfully induced mechanical sensations on the fingertip within a low applied voltage range of 5-20 V.
  • Demonstrated the transmission of distinct haptic patterns, such as letters 'T', 'H', 'U' and numbers '0', '1', '2'.
  • Achieved 1-hour continuous operation with the untethered stimulation patch.

Conclusions:

  • The proposed soft haptic system offers a viable solution for wireless, low-voltage tactile feedback.
  • The design principles and analytical models are transferable to other wearable electronics.
  • Potential applications include augmented reality, virtual reality, and robotics, enhancing user interaction through tactile feedback.