Ion beam irradiation for surface modification of alignment layers in LCD

Hong Gyu Park, Byeong Yun Oh, Young Hwan Kim, Byoung Yong Kim, Jeong Min Han, Chul Ho Ok, Jeong Yeon Hwang, Dae Shik Seo

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We investigated liquid crystal (LC) alignment as a function of ion beam (IB) incident angles and electro-optical (EO) characteristics of twisted nematic (TN)-liquid crystal displays (LCD) on polyimide (PI) surfaces. X-ray photoelectron spectroscopic analysis showed that the intensity of C=O chemical bonding decreased, while that of C-O chemical bonding increased for increasing IB incident angles. This indicates that the dipole-dipole interaction between C-O chemical bonding and the LC molecules has a chemical alignment effect. A good uniform alignment of nematic LCs on PI surfaces by the IB irradiation was observed, and good EO properties of IB-aligned TN-LCDs on PI surfaces were achieved.

Original languageEnglish
Pages (from-to)45-52
Number of pages8
JournalMolecular Crystals and Liquid Crystals
Publication statusPublished - 2009 Jan

Bibliographical note

Funding Information:
This research was supported by the MKE (Ministry of Knowledge Economy), Korea under the ITRC (Information Technology Research Center) Support program supervised by the IITA (Institute of Information Technology Advancement) (IITA-2008-C1090-0801-0018).

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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