Filtering of yellow light in a liquid-crystal light shutter for higher color contrast and reduced glare

Abstract This study investigates the filtering of yellow light in a dye-doped liquid crystal (LC) cell. Such filtering can reduce eye glare due to intense sunlight or high-beam headlights. Unlike commonly used dichroic dyes, the yellow dye used in this study is not switchable by the electric-field-induced alignment of LCs. Therefore, the yellow color, which can cause glare in all states, can be removed. Due to the physical properties of the yellow dye, dynamic scattering occurs at high voltages, which can lead to a high-haze opaque state. The proposed LC cell can be switched among the transparent, haze-free opaque, and high-haze opaque states simply by increasing the applied voltage.