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

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Published on: February 27, 2019

3D touchless multiorder reflection structural color sensing display.

Han Sol Kang¹, Sang Won Han², Chanho Park¹

¹Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea.

Science Advances

|August 25, 2020

Summary

This summary is machine-generated.

Researchers developed a novel 3D touchless display using block copolymer photonic crystals. This innovative display visualizes finger position through structural colors, offering a new human-computer interaction method.

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Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Developing user-interactive 3D touchless displays is crucial for advanced human-computer interaction.
Existing technologies often face limitations in terms of power consumption, weight, and real-time visualization.
Noncontact sensing and visualization require innovative material and display technologies.

Purpose of the Study:

To present a user-interactive 3D touchless sensing display.
To utilize multiorder reflection structural colors (SCs) from block copolymer (BCP) photonic crystals (PCs).
To enable noncontact detection and simultaneous visualization of human stimuli.

Main Methods:

Fabrication of a solid-state BCP photonic crystal with alternating lamellae.
Incorporation of a chemically cross-linked, interpenetrated hydrogel network within the BCP.
Absorption of nonvolatile ionic liquid into the hydrogel network for SC manipulation via multiorder photonic reflections.
Development of a printable display using hygroscopic ionic liquid ink.

Main Results:

Achieved full-visible-range structural colors (SCs) in the BCP PC.
Demonstrated unprecedented visible SCs through reflective color mixing.
Created a printable 3D touchless interactive display.
Successfully visualized the 3D position of a human finger based on SC variations with distance.

Conclusions:

The developed BCP PC-based display offers a lightweight, low-power, and user-interactive 3D touchless sensing capability.
The use of ionic liquids and structural colors provides a novel mechanism for noncontact visualization.
This technology paves the way for advanced interactive displays and human-computer interfaces.