Application of Magnesium Fluoride (MgF2) Thin Films for Liquid Crystal Alignment Using Ion-Beam Irradiation

作者：Kim Iee Gon^*; Park Hong Gyu; Han Jae Jun; Han Jeong Min; Seo Dae Shik

来源：IEEE Electron Device Letters, 2013, 34(2): 283-285.

DOI：10.1109/LED.2012.2230608

• Electrooptic (EO) characteristics
• ion-beam (IB) irradiation
• liquid crystal (LC)
• magnesium fluoride (MgF2)

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.

• 出版日期2013-2