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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

271
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...
271
Frictional Force01:07

Frictional Force

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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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Related Experiment Video

Updated: May 23, 2025

Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis
08:58

Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis

Published on: July 7, 2023

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Reconfigurable Flexible Haptic Interface Using Localized Friction Modulation.

Romain Le Magueresse, Fabrice Casset, Frederic Giraud

    IEEE Transactions on Haptics
    |March 7, 2025
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel flexible haptic surface using ultrasonic resonators to enable texture rendering and shape display on flexible materials. The technology achieves high accuracy in shape and pattern recognition, overcoming limitations of current flexible haptic solutions.

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    Area of Science:

    • Haptics and Human-Computer Interaction
    • Materials Science and Engineering
    • Robotics and Mechatronics

    Background:

    • Flexible haptic technologies face challenges in texture rendering due to poor elastic wave propagation in substrates.
    • Existing alternative actuators have low density, limiting fine texture rendering capabilities.
    • Rigid haptic surfaces offer effective friction modulation but lack conformability.

    Purpose of the Study:

    • To develop and evaluate an innovative haptic solution for localized or continuous texture rendering on a flexible surface.
    • To combine the friction modulation advantages of rigid surfaces with the conformability of thin polymer sheets.
    • To enable multi-touch and multi-user interaction on a flexible haptic display.

    Main Methods:

    • Development of a flexible haptic surface using piezoelectric-driven ultrasonic resonators within a polymer matrix.
    • Characterization of the surface's ability to modulate friction for texture stimulation.
    • Evaluation through user studies involving shape identification and simultaneous tactile pattern recognition.

    Main Results:

    • Tribological measurements confirmed friction reduction aligned with desired shapes.
    • Participants achieved a 96% success rate in identifying simple geometric shapes within 14 seconds.
    • Two users simultaneously recognized independent tactile patterns with 89% accuracy.

    Conclusions:

    • The developed flexible haptic device effectively renders simple geometric shapes and textures.
    • The technology supports multi-touch and multi-user interaction on a conformable surface.
    • This innovation holds significant potential for diverse applications requiring advanced flexible haptic feedback.