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Related Experiment Video

Updated: Mar 20, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Inkjet-Printed Cholesteric Liquid Crystal Pixels with Frequency-Addressable Optical Memory for Energy-Efficient

Jun-Seok Ma1,2, Dongryul Lee3, Hyun-Woo Oh1

  • 1Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.

ACS Applied Materials & Interfaces
|March 19, 2026
PubMed
Summary
This summary is machine-generated.

Inkjet-printed cholesteric liquid crystal pixels offer energy-efficient optical memory. This frequency-addressable technology enables tristable states for displays and smart windows without continuous power.

Keywords:
drop-on-demand printingelectrohydrodynamic convectionenergy-efficient photonic devicesfield-off memorytristable optical states

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Area of Science:

  • Materials Science
  • Photonics
  • Display Technology

Background:

  • Cholesteric liquid crystals (CLCs) offer unique optical properties but require scalable manufacturing for practical applications.
  • Existing display technologies often demand continuous power for memory states, limiting energy efficiency.

Purpose of the Study:

  • To develop a manufacturable pixel architecture for frequency-addressable tristable optical memory using inkjet printing.
  • To demonstrate energy-efficient reflective modulation with nonvolatile optical memory capabilities.

Main Methods:

  • Utilizing drop-on-demand inkjet printing to create individually programmable CLC droplets.
  • Employing frequency-selective electrical fields to induce tristability via competing electrohydrodynamic and dielectric effects.

Main Results:

  • Achieved individually programmable CLC pixels with three distinct optical states: transparent colored, opaque concealment, and opaque memory.
  • Demonstrated nonvolatile optical memory with field-off retention, eliminating continuous power requirements.
  • Fabricated printed arrays with 63.5 dpi resolution and uniform switching over large areas (8.5 × 8.5 cm²).

Conclusions:

  • Inkjet-defined CLC pixels provide a scalable, mask-free platform for frequency-addressable tristable optical memory.
  • This technology enables energy-efficient reflective modulation for applications like smart windows and reflective displays.
  • The integration of structural coloration, transmittance modulation, and nonvolatile memory offers a practical pathway for programmable photonic surfaces.