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P‐144: Effects of dielectric anisotropy and electrode structure on the performance of VA‐FFS LC mode
Author(s) -
Choi WingKit,
Hsu ChihWei,
Tung ChiaHsiang,
Tseng BoKai
Publication year - 2020
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.14285
Subject(s) - liquid crystal , anisotropy , electrode , materials science , dielectric response , dielectric , response time , mode (computer interface) , optoelectronics , optics , chemistry , computer science , physics , computer graphics (images) , operating system
Vertically‐Aligned Fringe‐Field Switching (VA‐FFS) liquid crystal (LC) mode is known for its intrinsic submillisecond fast response time due to existence of “self‐imposed boundaries” or “virtual walls”. In this paper, we investigate the difference between VA‐FFS LC mode employing LC materials with positive and negative dielectric anisotropy for both 2D and 3D electrode designs. We found that, in general, positive LC materials can provide faster response time whereas negative LC materials can provide higher transmission. In the case of 2D design, negative LC is found to have unexpected slow response times due to i) existence of a 2‐step switching process and ii) disappearance of virtual walls. By using 3D design, both ofthese problems for negative LC have been found to be improved. Due to its fast response time, VA‐FFS LC has been actively researchedfor VR/AR applications in recent years.