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Enhanced Electrooptical Characteristics of Twisted Nematic Liquid Crystal Display With \hbox {ZrO}_{2} Thin Films

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4 Author(s)
Lee-Gon Kim ; Dept. of Electr. & Eng., Yonsei Univ., Seoul, South Korea ; Hong-Gyu Park ; Young-Hwan Kim ; Dae-Shik Seo

A rubbing-free liquid crystal (LC) alignment method is highly desirable for future generations of large high-resolution LC-display technology. In this paper, ion-beam (IB) bombardment was carried out as an LC alignment method in order to modify the ZrO2 surface, and unidirectional LCs were achieved. The pretilt angle was found to be a function of the IB incident energy, and a possible mechanism of the LC alignment was investigated with X-ray photoelectron spectroscopy (XPS). XPS analysis showed that the LC alignment on the IB-irradiated ZrO2 surface was primarily due to the reformation of O-Zr bonds. The response time of a twisted nematic cell with IB-irradiated ZrO2 thin films was superior to those with rubbed polyimide films.

Published in:

Electron Device Letters, IEEE  (Volume:33 ,  Issue: 8 )