Polyimide liquid crystal alignment layers prepared by soft-Lithography

HE Yaning, LIU Bin, REN Hongfeng, WANG Xiaogong

Front. Chem. China ›› 2007, Vol. 2 ›› Issue (3) : 318-321.

PDF(352 KB)
PDF(352 KB)
Front. Chem. China ›› 2007, Vol. 2 ›› Issue (3) : 318-321. DOI: 10.1007/s11458-007-0059-8

Polyimide liquid crystal alignment layers prepared by soft-Lithography

  • HE Yaning, LIU Bin, REN Hongfeng, WANG Xiaogong
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Abstract

Elastomeric replicas of surface relief structures were prepared by molding poly(dimethylsiloxane) (PDMS) precursors against photo-inscribed surface-relief-gratings on azo polymer films. The PI solutions were micro-contact printed with the elastomeric PDMS replica on quartz slides. Good surface-relief-grating structures were formed on the quartz slides. The quartz slides covered with surface-relief-grating polymide (PI) films were then assembled into liquid crystal (LC) cells. The transmittance passing through the cell between crossed polarizers changed periodically with a regular 90º separation of the rotational angle. The pretilt angle of the cell was found to be 2.8º. Results showed that the PI films with surface-relief-grating structures by this micro-contact printing process have good liquid crystal alignment ability. This preparation method of alignment layers can be considered a potentially useful technique in the LC display (LCD) industry in the future.

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HE Yaning, LIU Bin, REN Hongfeng, WANG Xiaogong. Polyimide liquid crystal alignment layers prepared by soft-Lithography. Front. Chem. China, 2007, 2(3): 318‒321 https://doi.org/10.1007/s11458-007-0059-8
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