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 b...

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Bibliographic Details
Published in:Optics letters 2010-04, Vol.35 (8), p.1151-1153
Main Authors: NA, Hyun-Jae, LEE, Jin-Woo, LEE, Won-Kyu, LIM, Ji-Hun, PARK, Hong-Gyu, KIM, Byoung-Yong, HWANG, Jeong-Yeon, HAN, Jeong-Min, SEO, Dae-Shik
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Liquid crystals
Optical materials
Optics
Physics
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Summary: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.35.001151