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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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Tactile and Chemical Senses01:27

Tactile and Chemical Senses

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Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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Related Experiment Video

Updated: Nov 18, 2025

Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing
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A nanograting-based flexible and stretchable waveguide for tactile sensing.

Wang Peng1,2, Qingxi Liao3, Han Song4

  • 1College of Engineering, Huazhong Agricultural University, Wuhan, 430070, China. pengwang@mail.hzau.edu.cn.

Nanoscale Research Letters
|February 6, 2021
PubMed
Summary

A novel flexible optical waveguide for tactile sensing was developed, enabling accurate pressure and strain measurement on irregular surfaces. This innovation enhances tactile perception capabilities in flexible electronics.

Keywords:
Flexible and stretchable waveguideNanoreplica moldingtactile sensing

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Robotics

Background:

  • Traditional optical waveguides struggle with conforming to irregular surfaces.
  • Developing conformable sensors is crucial for advanced tactile perception.

Purpose of the Study:

  • To propose a flexible and stretchable optical waveguide structure for tactile sensing.
  • To leverage optical loss due to mechanical deformation for sensing.

Main Methods:

  • Fabrication using nanoreplica molding.
  • Utilizing the principle of light loss caused by mechanical deformation.
  • Application in measuring pressure and strain.

Main Results:

  • The flexible optical waveguide demonstrated a strain detection range of 0-12.5%.
  • It achieved an external force detection range of 0 to 23 × 10⁻³ N.
  • Successfully applied to tactile sensing applications.

Conclusions:

  • The proposed flexible and stretchable optical waveguide overcomes limitations of traditional devices.
  • This technology offers a promising solution for conformable tactile sensing.
  • Enables precise measurement of pressure and strain in flexible electronic systems.