著作(論文等)

基本情報

氏名 高頭 孝毅
氏名(カナ) タカトウ コウキ
氏名(英語) TAKATOH Kohki

論文名

Optical Filters with Asymmetric Transmittance Depending on the Incident Angle, Produced Using Liquid Crystalline Ink (Louver LC Filters)

著者名

Kohki Takatoh, Mika Kobayashi, Masahiro Ito

掲載誌名等

Materials

掲載年月

2023/08

16

16

開始頁

5584

 

終了頁

5600

出版者(日本語)

MDPI

出版者(英語)

MDPI

発表形態

REGULAR PAPER

概要

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.