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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

619
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...
619
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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A Tactile Automated Passive-Finger Stimulator TAPS
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Tacsac: A Wearable Haptic Device with Capacitive Touch-Sensing Capability for Tactile Display.

Oliver Ozioko1, William Navaraj2, Marion Hersh3

  • 1Bendable Electronics and Sensing Technologies (BEST) Group, University of Glasgow, Glasgow G12 8QQ, UK.

Sensors (Basel, Switzerland)
|August 28, 2020
PubMed
Summary

This study introduces Tacsac, a wearable device enabling communication for deafblind individuals through tactile sensing and vibrotactile feedback. This innovative technology offers a new way for deafblind users to interact with mobile devices.

Keywords:
actuatordeafblind communicationtactile displaytactile sensor

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Area of Science:

  • Human-Computer Interaction
  • Wearable Technology
  • Biomedical Engineering

Background:

  • Deafblind individuals face significant communication barriers.
  • Existing assistive technologies often lack integrated sensing and feedback capabilities.
  • The need for intuitive, two-way communication tools for the deafblind population is critical.

Purpose of the Study:

  • To develop and evaluate a dual-function wearable device (Tacsac) for communication among deafblind people.
  • To integrate capacitive tactile sensing and vibrotactile feedback into a single, compact device.
  • To enhance localized haptic feedback and touch-sensing for improved user interaction.

Main Methods:

  • Fabrication of a vibrotactile module using a flexible electromagnetic actuator (flexible coil, permanent magnet, PDMS).
  • Development of a touch-sensing module utilizing a planar capacitive metal-insulator-metal (MIM) structure.
  • Integration of both modules into a single wearable device and testing in independent and dual modes.

Main Results:

  • The Tacsac device demonstrated synchronous vibration response to stimuli across a wide frequency range (10 Hz to 200 Hz).
  • The actuator exhibited a resonance frequency of 60-70 Hz with a maximum displacement of 0.377 mm at 180 mA.
  • The capacitive touch-sensitive layer performed with minimal noise, functional during both actuator ON and OFF states.

Conclusions:

  • Tacsac successfully integrates tactile sensing and vibrotactile feedback for effective communication.
  • The device provides efficient two-way communication between deafblind users and mobile devices.
  • This technology advances tactile displays, offering a novel solution for deafblind communication.