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Homeotropic alignment of liquid crystals on a nano-patterned polyimide surface using nanoimprint lithography

Authors
Park, Hong-GyuLee, Jong-JinDong, Ki-YoungOh, Byeong-YunKim, Young-HwanJeong, Hae-YoonJu, Byeong-KwonSeo, Dae-Shik
Issue Date
2011
Publisher
ROYAL SOC CHEMISTRY
Keywords
LCD; LC alignment; Nano patterning
Citation
SOFT MATTER, v.7, no.12, pp.5610 - 5614
Indexed
SCIE
SCOPUS
Journal Title
SOFT MATTER
Volume
7
Number
12
Start Page
5610
End Page
5614
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/115064
DOI
10.1039/c1sm05083d
ISSN
1744-683X
Abstract
In this paper, nanoimprint lithography was utilized to transfer a nano-pattern (NP) onto a homeotropic polyimide (PI) surface for use in liquid crystal displays (LCDs). The nano-patterned silicon mold was fabricated by laser interference lithography. A NP PI layer acted as the homeotropic alignment layer to easily and uniformly align the liquid crystal (LC) molecules. A NP LC cell with a NP PI layer was successfully operated as a vertical aligned LCD, and its performance was evaluated. The threshold voltage and response time of the NP LC cell were 2.472 V and 22.7 ms, respectively. In addition, the NP LC cell was characterized by a high thermal budget. Therefore, the competitive performance of the NP LC cell could allow new approaches to replace the conventional rubbing process in display technology.
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