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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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: Jun 12, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Multifunctional device based on a nematic liquid crystal.

Ya-Song Kuai, Ke Xia, Hao-Yi Jiang

    Optics Express
    |June 11, 2026
    PubMed
    Summary
    This summary is machine-generated.

    This study presents two multifunctional devices using liquid crystal (LC) for radio frequency applications. The devices show significant frequency and phase shifts, highlighting LC

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    An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

    Published on: February 27, 2019

    Area of Science:

    • Materials Science
    • Electrical Engineering
    • Physics

    Background:

    • Liquid crystals (LC) possess unique fluid and anisotropic properties.
    • LC materials are gaining interest for advanced radio frequency (RF) technologies.

    Purpose of the Study:

    • To develop and characterize multifunctional devices (MDs) using nematic liquid crystals for RF applications.
    • To evaluate the performance of LC-based MDs across a range of temperatures (40 °C to 180 °C).

    Main Methods:

    • Characterization of dielectric constant and loss tangent for HSG14100-200 liquid crystal material.
    • Development of LC-based MDs using theoretical models.
    • Performance evaluation of parallel-aligned and perpendicular-aligned LC cells.
    • Microscopic observation of phase transitions using a polarizing optical microscope.

    Main Results:

    • The perpendicular-aligned LC cell MD achieved a peak resonant frequency shift of 0.40 GHz and a 20.53° phase shift.
    • The parallel-aligned LC cell MD showed a 0.16 GHz frequency shift and a 7.03° phase shift.
    • Observed phase transitions directly correlated with the modulation of dielectric properties.

    Conclusions:

    • Liquid crystal devices demonstrate significant reconfigurability in frequency and phase for RF applications.
    • The findings support the potential of LC in advanced communication systems, including phased array and reconfigurable antennas.
    • This research provides theoretical validation and a foundation for future LC-based RF device development.