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Preparation, Properties and Applications of Liquid Crystal Materials and Polymers

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Soft Matter".

Deadline for manuscript submissions: closed (20 February 2024) | Viewed by 1917

Special Issue Editor


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Guest Editor
Department of Electrical Engineering, Faculty of Engineering, Sanyo-Onoda City University, 1-1-1 Daigaku-dori, Sanyo-Onoda, Yamaguchi 756-0884, Japan
Interests: liquid crystal device; liquid crystal materials; optical films; low driving technology; liquid crystal polymer; liquid crystal monomer; liquid crystal alignment
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Special Issue Information

Dear Colleagues,

The development of liquid crystal devices (LCDs) (such as L displays) and LC materials are inseparable. In the early 1970s,  practical LCDs (such as twisted nematic LCDs) and the practical LC materials (such as cyanobiphenyl compounds) were developed almost simultaneously. Furthermore, when the industry of thin-film transistors (TFT) LCDs started, LC materials of fluoro compounds, which became essential for TFT-LCDs, were developed. The industry of LC displays has developed greatly, partly because of the discovery of materials. Currently, liquid crystal technology explores the next applications beyond displays, e.g., optical switching devices for optical communication, smart windows for architectures, LCDs for vehicles, laser equipment, LiDar for EV, glasses, lighting equipment, and so on. Furthermore, research on LC materials has expanded in the areas of new LC materials for new applications, such as LC monomers applied for LCDs, LC optical polymers, LC paints, and so on.

This Special Issue aims to provide an opportunity to overview new developments of LC material technologies for new devices at this point.

Prof. Dr. Kohki Takatoh
Guest Editor

Manuscript Submission Information

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Keywords

  • liquid crystals
  • LC materials
  • LC monomers
  • LC polymers
  • LCDs
  • optical films

Published Papers (1 paper)

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Research

16 pages, 8458 KiB  
Article
Optical Filters with Asymmetric Transmittance Depending on the Incident Angle, Produced Using Liquid Crystalline Ink (Louver LC Filters)
by Kohki Takatoh, Mika Kobayashi and Masahiro Ito
Materials 2023, 16(16), 5584; https://doi.org/10.3390/ma16165584 - 11 Aug 2023
Viewed by 1435
Abstract
In many situations in everyday life, sunlight levels need to be reduced. Optical filters with asymmetric transmittance dependent on the incident angle would be useful for sunglasses and vehicle or architectural windows, among others. Herein, we realized the production of optical filters, called [...] Read more.
In many situations in everyday life, sunlight levels need to be reduced. Optical filters with asymmetric transmittance dependent on the incident angle would be useful for sunglasses and vehicle or architectural windows, among others. Herein, we realized the production of optical filters, called “louver filters”, comprising HAN-type LC film produced using liquid crystalline ink with dichroic dyes. For the formation of the HAN-type LC film, the liquid crystalline ink was aligned on a rubbed polyimide layer and polymerized by UV irradiation. Two kinds of filters are proposed: one is a filter composed of HAN-type LC film and a polarizer, and the other is composed of two HAN-LC films with a half-wave plate between them. The dependence of the asymmetric transmittance on the incident angle was confirmed for these filters. The dependence changed depending on the pretilt angle of the alignment layers. Photographs taken with the optical filters displayed their effectiveness. Full article
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