Comparison of Friction Characteristics on TN and VA Mode Alignment Films with Friction Force Microscopy

Musun KWAK; Hanrok CHUNG; Hyukmin KWON; Jehyun KIM; Daekyung HAN; Yoonseon YI; Sangmun LEE; Chulgu LEE; Sooyoul CHA

doi:10.1587/transele.E92.C.1366

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Comparison of Friction Characteristics on TN and VA Mode Alignment Films with Friction Force Microscopy

Musun KWAK, Hanrok CHUNG, Hyukmin KWON, Jehyun KIM, Daekyung HAN, Yoonseon YI, Sangmun LEE, Chulgu LEE, Sooyoul CHA

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Keywords: frictional force microscopy, FFM, frictional asymmetry, alignment film, pre-tilt, LCD

JOURNAL RESTRICTED ACCESS

2009 Volume E92.C Issue 11 Pages 1366-1370

DOI https://doi.org/10.1587/transele.E92.C.1366

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Abstract

Using frictional force microscopy (FFM), the friction surface characteristics were compared between twisted nematic (TN) mode and vertical alignment (VA) mode alignment films (AFs). The friction asymmetry was detected depending on temperature conditions on TN mode AF, but not on VA mode AF. The difference between two modes was explained by leaning intermolecular repulsion caused by the pre-tilt angle uniformity and the density of side chain. No level difference according to temperature conditions appeared when the pre-tilt angle were measured after liquid crystal (LC) injection.

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