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Liquid crystal alignment on zinc oxide nanowire arrays for LCDs applications

Mu-Zhe Chen, Wei-Sheng Chen, Shie-Chang Jeng, Sheng-Hsiung Yang, and Yueh-Feng Chung

Open Access Open Access

Abstract

The zinc oxide (ZnO) nanowire arrays on the indium tin oxide (ITO) glass substrates were fabricated by using the two-step hydrothermal method. A high transmittance ~92% of ZnO nanowire arrays on ITO substrate in the visible region was obtained. It was observed that the liquid crystal (LC) directors were aligned vertically to the (ZnO) nanowire arrays. The properties of ZnO nanowire arrays as vertical liquid crystal (LC) alignment layers and their applications for hybrid-aligned nematic LC modes were investigated in this work.

©2013 Optical Society of America

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Figures (7)
Fig. 1
Fig. 1 The schematic illustration of fabrication process of the ZnO nanowire arrays on the ITO glass substrate.

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Fig. 2
Fig. 2 The schematic illustration of the LC cells studied in this work. (a) VA-LCD, and (b) HAN-LCD.

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Fig. 3
Fig. 3 The SEM images of ZnO NW arrays /ITO substrates. (a) Top view and (b) cross section view.

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Fig. 4
Fig. 4 The transmittance spectra of the ITO glass and ZnO NW arrays/ITO substrate at three different incident angles.

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Fig. 5
Fig. 5 Photographs of the VA-LCDs observed by POM with two different orientations of the crossed polarizers, where the insets illustrate the corresponding conoscopic images.

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Fig. 6
Fig. 6 The voltage-dependent optical transmittance of the VA-LCD. Two insets of a dark image and a bright image are observed by POM at V = 0 V and V = 5.7 V, respectively.

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Fig. 7
Fig. 7 The voltage-dependent optical transmittances of the proposed HAN-LCD and traditional HAN-LCD. Two insets of a dark image and a bright image are observed by POM at V = 10 V and V = 1,7 V, respectively.

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