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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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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Published on: October 31, 2019

Implementing an active reconfigurable intelligent surface with a thin liquid crystal layer through 1-bit

Changhyeong Lee1, Hyengcheul Choi2, Jaewon Huh2

  • 1Corning Technology Center Korea, Asan-si, 31454, Republic of Korea. leec34@corning.com.

Scientific Reports
|May 14, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel Reconfigurable Intelligent Surface (RIS) using liquid crystals (LC) and glass, enhancing wireless communication. The design achieves significant phase shifts with low voltage, offering a cost-effective alternative to traditional electronics.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Wireless Communications

Background:

  • Reconfigurable Intelligent Surfaces (RIS) are crucial for future wireless networks, aiming to control electromagnetic wave propagation.
  • Existing RIS technologies often rely on semiconductor-based electronics or printed circuit boards (PCBs), which can be costly and difficult to scale.
  • Liquid Crystals (LC) offer tunable dielectric properties, making them potential candidates for low-cost, large-scale RIS fabrication.

Purpose of the Study:

  • To propose and demonstrate a proof-of-concept Reconfigurable Intelligent Surface (RIS) utilizing liquid crystals (LC) and specialized glass substrates.
  • To investigate the feasibility of achieving substantial phase shifts with a thin LC layer for wireless communication applications.
  • To explore the potential of leveraging conventional LCD manufacturing for cost-effective and large-scale RIS production.

Main Methods:

  • Designed a RIS structure comprising copper-coated glass substrates with a 20 μm thick liquid crystal layer sandwiched between them.
  • Applied a driving voltage of 10 V to alter the alignment of LC molecules and measure the resulting phase shift.
  • Operated within a specific frequency band relevant to wireless communication.

Main Results:

  • Achieved a phase shift exceeding 180° with a thin 20 μm LC layer, significantly thinner than previously reported.
  • Demonstrated the ability to control electromagnetic wave reflection direction by adjusting LC molecular alignment via applied voltage.
  • Confirmed the potential for cost reduction and scalability using established LCD manufacturing techniques.

Conclusions:

  • The proposed LC-based RIS design is a viable proof-of-concept for enhancing wireless communication coverage.
  • This approach offers a promising, low-cost, and scalable alternative to conventional RIS technologies.
  • Further research can optimize the design for specific wireless communication standards and explore advanced functionalities.