Abstract
This study proposed a new type of optical device with variable transmittance based on the incident angle direction. These devices consist of two liquid crystal devices (LCDs) with a half-wave plate between them. Hybrid aligned nematic (HAN)-type guest-host (GH) LCDs or GH-LCDs with antiparallel alignment of high pretilt angles were used. The use of a half-wave plate allowed for the control of the p- and s-waves. Using these devices, a wide range of transmittances were obtained because no polarizer was used. The newly proposed LCDs have a wide range of applications, including use on buildings, vehicles, and glasses.
Highlights
Optical filters whose transmittance is small in the upward direction and large in the front or downward directions should be valuable
This study proposes a method for Hybrid aligned nematic (HAN)-liquid crystal devices (LCDs) parallel to the liquid crystal (LC) direction
This study proposes a method for HAN-LCDs to work for to wor non-polarized light
Summary
Light control is extremely important for observing objects correctly without stress. The light observed directly from the sky to the eyes can be a large hindrance to observing an object correctly. Optical filters whose transmittance is small in the upward direction and large in the front or downward directions should be valuable. Thin optical films with this function have a variety of applications, such as buildings, vehicles, and glasses. It can be valuable if the transmittance is controlled by the electric field. This investigation used guest-host (GH) liquid crystal (LC) devices for these applications.
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