Color Design and Adjustment of Dichroic Dyes for Reflective Three-Layered Guest-Host Liquid Crystal Displays

ABSTRACT

Relationships between properties of dichroic dyes and performances of three layered Guest-Host Liquid Crystal Displays (GH-LCDs) with subtractive color mixing of yellow, magenta and cyan were studied by color mixing simulation.

In the case of using the dyes we developed, it was found that the color reproduction areas were as much as 1.6 times larger than in the case of using only commercially available dyes. Performances of our prototype reflective three-layered GH-LCDs were high (the luminous reflectance of the white state was 43%, and the contrast was 5.3), indicating that three-layered GH-LCDs are practical for the display of full-color images.

Keywords:

• color reproduction area
• dichroic dyes
• three-layered GH-LCDs

Notes

*1-(4-t-butylphenylthio)-5-phenylthioanthraquinone.

ZLI-2806 (negative liquid crystal purchased from Merck Ltd.) and S811 (chiral compound purchased from Merck Ltd.) were used in this study.

Thickness Dummy cell: 10 µm

Applied voltage: 10 V

Alignment layer: polymer which induced a homeotropic structure in liquid crystal.