Open AccessGeneration of pretilt angles of liquid crystals on cinnamate-based photoalignment layer by a simple directional peel-off process
Author(s) -
Jihye Lee,
Seung-Woo Lee,
Yong Jeong,
Kuk Young Cho,
Jung Ki Park
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.023565
Subject(s) - rubbing , materials science , liquid crystal , optics , layer (electronics) , liquid crystal display , process (computing) , optoelectronics , composite material , computer science , physics , operating system
As an alternative to the rubbing method, the photoalignment method has been extensively developed for liquid crystal displays owing to its various advantages including the absence of any contamination problems, feasibility of multi-domain structure formation, and low temperature processing capability. However, cinnamate-based photo-reactive materials that are widely used in photoalignment suffer from several limitations including low pretilt angle and limited control of tilted-up direction of the liquid crystals compared to that of the rubbing process. In this work, we demonstrate a simple and convenient method to generate the pretilt angle, compared to that achieved via the rubbing method, by means of a simple directional peel-off process using a photo-reactive cinnamate oligomer having flexible molecular chain.