A Study of the Liquid Crystal Alignment Mechanism of Bond-Breaking Via Ion-Beam Irradiation of an Amorphous Aluminum-Oxide Surface

作者：Kim Dai Hyun^*; Jung Hae Yoon; Kang Young Gu; Kim Young Hwan; Park Hong Gyu; Kim Byoung Yong; Seo Dae Shik

来源：Journal of Display Technology, 2011, 7(1): 19-23.

DOI：10.1109/JDT.2010.2086432

• a-Al2O3
• Ion-beam (IB) bombardment
• liquid crystals (LCs)
• vertical alignment (VA)

In this paper, we study the Ion-beam (IB) irradiated amorphous (a)-aluminum oxide (Al2O3) inorganic layer deposited by RF magnetron sputtering as an liquid crystal (LC) alignment layer. Uniformly vertical-aligned (VA)-LC on a-Al2O3 surface resulted from IB irradiation energy above 1800 eV. We assumed that LC molecular orientation depends on the intensity of Al 2p, O 1s peaks, which were confirmed through X-ray photoelectron spectroscopy (XPS) measurements. XPS showed that IB irradiation changed the chemical structure, breaking Al-O bonds by altering Al-O and O-Al bonding intensity. Also, electro-optical characteristics of vertical-aligned-LC displays (VA-LCDs) on the Al2O3 alignment layers were measured, which showed reduced threshold voltage and power consumption, as compared with IB irradiated and rubbed polyimide (PI) layers.

• 出版日期2011-1