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Design Example: Resistive Touchscreen01:14

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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.
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Tactile and Chemical Senses01:27

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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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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Large-Scale Integrated Flexible Tactile Sensor Array for Sensitive Smart Robotic Touch.

Zhenxuan Zhao1, Jianshi Tang1,2, Jian Yuan1

  • 1School of Integrated Circuits, Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing 100084, China.

ACS Nano
|September 27, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a high-resolution flexible tactile sensor array for smart robotics. This advanced sensor mimics human touch, enabling robots to perceive their environment with unprecedented detail and accuracy.

Keywords:
Carbon nanotubeMemristorPiezoresistive filmPressure sensor arraySmart tactile system

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Area of Science:

  • Robotics
  • Materials Science
  • Sensor Technology

Background:

  • Robotics development requires human-like senses, particularly touch, which lags behind vision advancements.
  • Existing tactile sensors lack the necessary sensitivity, spatial resolution, and response speed for advanced applications.
  • There is a need for large-scale, flexible tactile sensor arrays to bridge this gap.

Purpose of the Study:

  • To develop a high-performance, large-scale flexible tactile sensor array.
  • To integrate this sensor with computing hardware for real-time tactile sensing and recognition.
  • To advance the capabilities of smart robotics through enhanced tactile sensing.

Main Methods:

  • Fabrication of a 64x64 flexible tactile sensor array using piezoresistive film (PRF) and carbon nanotube thin-film transistors.
  • Characterization of PRF properties, including pressure sensitivity, response time, linearity, detection range, and cyclability.
  • Integration of the tactile sensor array with a memristor-based computing-in-memory chip for hardware implementation of recognition tasks.

Main Results:

  • Achieved a record spatial resolution of 0.9 mm (28.2 PPI) on a flexible tactile sensor array.
  • Demonstrated high pressure sensitivity (~385 kPa^-1) and fast response time (~3 ms) with PRF.
  • Successfully identified footprint maps of an artificial honeybee and achieved high classification accuracies (98.8% for digits, 97.3% for calligraphy) in hardware.

Conclusions:

  • The developed tactile sensor array offers significant improvements in resolution, sensitivity, and response time.
  • Integration with computing-in-memory hardware enables efficient tactile recognition, paving the way for edge computing in robotics.
  • This work advances the development of intelligent sensor networks for next-generation smart robots.