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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
578

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Flexible Electrostatic Transducer Array with Displacement Control for Haptic Sensing and Actuation.

Ian Trase1, Hong Z Tan2, Zi Chen1

  • 1Thayer School of Engineering, Dartmouth College, 14 Engineering Drive, Hanover NH 03755, USA.

Sensors and Actuators. A, Physical
|December 31, 2020
PubMed
Summary

We created novel flexible electrostatic transducers capable of precise displacement control under varying loads. These devices are suitable for developing advanced haptic wearable technology.

Keywords:
Displacement ControlElectrostaticFlexible ElectrodesHapticsSensingTransducer

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Robotics

Background:

  • Flexible electrostatic transducers offer potential for advanced haptic feedback systems.
  • Precise control and sensing of displacement are crucial for effective haptic interactions.
  • Existing technologies may lack the necessary sensitivity or flexibility for certain applications.

Purpose of the Study:

  • To develop and characterize flexible electrostatic transducers for precise displacement actuation and sensing.
  • To design a control system and algorithm for maintaining displacement under varying loads.
  • To evaluate the performance of single-element and array-based transducers for haptic applications.

Main Methods:

  • Fabrication of flexible electrostatic transducers with buckled films and integrated electrodes.
  • Development of control circuitry and algorithms for displacement management.
  • Capacitive sensing techniques to measure displacement under applied loads (5-27 mN).
  • Utilizing an 8Hz driving frequency for actuation and a 10.8kHz signal for capacitance sensing.

Main Results:

  • Demonstrated linear relationship between capacitance change and electrode contact area/displacement.
  • Developed a predictive model to correct for sensed load, maintaining average displacement.
  • A 10mm × 40mm transducer maintained displacement under 5-27 mN loads.
  • A 2x2 array of 10mm × 20mm transducers maintained displacement under 2.5-11 mN loads.

Conclusions:

  • The developed flexible electrostatic transducers can accurately measure and control displacement under load.
  • Performance metrics align with human sensory thresholds, indicating suitability for haptic wearables.
  • This work presents a viable method for creating controllable flexible transducers for diverse haptic applications.