Application of magnesium fluoride (MgF2) thin films for liquid crystal alignment using ion-beam irradiation

Iee Gon Kim, Hong Gyu Park, Jae Jun Han, Jeong Min Han, Dae Shik Seo

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6 Citations (Scopus)

Abstract

This letter introduces the characteristics of the magnesium fluoride ( MgF2) inorganic film deposited by an electron-beam evaporation system for liquid crystal display (LCD) applications. We first achieved homogeneous liquid crystal (LC) alignment by controlling the ion-beam (IB) irradiation energy intensity. We also showed that MgF2 is more transparent than spin-coated polyimide (PI) in the visible wavelength. By chemical analysis, IB irradiation selectively broke the Mg-F bonding structure because of the IB energy intensity; thus, the MgF2 surface was turned to an unstable MgF2-x surface, resulting in homogeneous LC orientation. Moreover, the electrooptic characteristics of a homogeneously aligned twisted nematic (TN)-LCD on the MgF2 layer showed good performance as the TN-LCD on the polyimide, showing a strong possibility of the MgF2 material as an LC alignment layer.

Original languageEnglish
Article number6389705
Pages (from-to)283-285
Number of pages3
JournalIEEE Electron Device Letters
Volume34
Issue number2
DOIs
Publication statusPublished - 2013 Jan 1

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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