Surface reformation and electro-optical characteristics of liquid crystal alignment layers using ion beam irradiation

Byeong Yun Oh, Kang Min Lee, Byoung Yong Kim, Young Hwan Kim, Jin Woo Han, Jeong Min Han, Sang Keuk Lee, Dae Shik Seo

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39 Citations (Scopus)

Abstract

The surface modification characteristics of liquid crystal (LC) alignment layers irradiated with various argon (Ar) ion beam (IB) energies were investigated as a substitute for rubbing technology. Various pretilt angles were created on the IB-irradiated polyimide (PI) surfaces after IB irradiation, but the Ar ions did not alter the morphology on the PI surface, indicating that the pretilt angle was not due to microgrooves. The chemical bonding states of the IB-irradiated PI surfaces were analyzed in detail by x-ray photoelectron spectroscopy to verify the compositional behavior for the LC alignment. Chemical structure analysis showed that the alignment ability of LCs was due to the preferential reorientation of the carbon network due to the breaking of C=O double bonds in the imide ring parallel to the incident IB direction. The potential of applying nonrubbing technology to display devices was further supported by the superior electro-optical characteristics compared to rubbed PI.

Original languageEnglish
Article number064502
JournalJournal of Applied Physics
Volume104
Issue number6
DOIs
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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