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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...
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Related Experiment Video

Updated: Mar 15, 2026

Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing
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A Hybrid-Frequency Sampling Tactile Sensing System Based on a Flexible Piezoresistive Sensor Array: Design and

Zhenxing Wang1, Xuan Dou2

  • 1School of Computer and Information Engineering, Shanghai Polytechnic University, Shanghai 201209, China.

Sensors (Basel, Switzerland)
|March 14, 2026
PubMed
Summary

This study introduces a novel hybrid-frequency sampling tactile sensing system using a flexible piezoresistive sensor array. The system achieves high-speed, reliable dynamic tactile perception with improved accuracy and durability for advanced robotics and human-machine interfaces.

Keywords:
Velostat sensordynamic tactile perceptionelectronic skintactile array

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Area of Science:

  • Robotics and Automation
  • Materials Science and Engineering
  • Sensor Technology

Background:

  • Existing multi-channel tactile arrays suffer from response drift, inconsistent dynamics, and low temporal resolution.
  • Reliable real-time tactile perception under dynamic loading remains a significant challenge in current sensing systems.

Purpose of the Study:

  • To develop a hybrid-frequency sampling tactile sensing system for reliable and real-time tactile perception under dynamic loading.
  • To enhance temporal resolution and reduce system complexity in flexible piezoresistive sensor arrays.

Main Methods:

  • Integrated a flexible piezoresistive sensor array (34 nodes) with a real-time data acquisition module using a hybrid-frequency sampling strategy.
  • Utilized Register-Transfer Level (RTL) simulation for hardware scheduler verification.
  • Validated dynamic loading using a self-developed pressure comparison platform for ground-truth force measurement.

Main Results:

  • Achieved an effective acquisition bandwidth of ~36.9 kHz with repeatability better than 4.9% and robust mechanical durability.
  • Demonstrated a strong linear correlation (R² ≈ 0.98) between e-skin outputs and reference forces.
  • Successfully distinguished tactile stimuli and captured dynamic responses during finger stroking with multi-unit activation patterns.

Conclusions:

  • The proposed hybrid-frequency sampling system offers a practical and scalable hardware platform for dynamic tactile sensing.
  • Achieved ~10x enhancement in effective sampling capability compared to previous systems, reducing complexity.
  • Enables reliable dynamic tactile sensing for applications in robotics, human-machine interaction, and wearable systems.