Titanium dioxide surface modification via ion-beam bombardment for vertical alignment of nematic liquid crystal.
We introduce the characteristics of the titanium dioxide (TiO(2)) inorganic film deposited by rf magnetron sputtering for liquid crystal display applications. The TiO(2) films demonstrated vertical alignment (VA) of the liquid crystals (LCs) obtained by using ion-beam (IB) bombardment. As observed by using x-ray photoelectron spectroscopy, the chemical structure of the TiO(2) was changed by IB bombardment, altering the Ti-O bonding of the Ti 2p spectra to lower intensity levels. Breaking Ti-O bonding by IB bombardment created pretilt angles between the TiO(2) film and LC molecules. The better voltage-transmittance characteristics of the VA LCDs based on TiO(2) film were measured and compared with the same characteristics of polyimide film.
Na
Hyun-Jae
HJ
Information Display Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University,262 Seongsanno, Seodaemun-gu, Seoul 120-749, South Korea.
Lee
Jin-Woo
JW
Lee
Won-Kyu
WK
Lim
Ji-Hun
JH
Park
Hong-Gyu
HG
Kim
Byoung-Yong
BY
Hwang
Jeong-Yeon
JY
Han
Jeong-Min
JM
Seo
Dae-Shik
DS