Alignment Technology and Applications of Liquid Crystal by Takatoh Kohki

By Takatoh Kohki

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Example text

The LC pretilt angle with BPDAtype polyimide exhibits an odd^even effect; the odd number polyimide shows nearly Æ10 of the LC pretilt angle, while the even numbered polyimide induces a relatively high LC pretilt angle. The NEXAFS spectra have successfully 20 Masaki Hasegawa revealed the surface structure differences between the odd- and even-numbered BPDA polyimides, a trans-cisoid type and a trans-transoid type, respectively [37]. The rigid biphenyl part of BPDA-C8 selectively tilts away from the surface by 15, while for BPDA-C7 it does not.

14 Masaki Hasegawa Distributions of polyimide side chains were also studied by using SHG [38, 52, 56]. A distribution function of a polyimide side chain, which is a non-linear active trifluorocarbon-substituted side chain, was measured [38]. Though the polyimide side chains are distributed on a conical surface with some polar angle before rubbing, they were pulled down at the side parallel to the rubbing, and pushed up on the side opposite to the direction of the rubbing. The azimuthal distribution was biased to rubbing and anti-rubbing direction [38].

The right side is that when the electric field is applied to the LC cell. When the electric field is applied to the LC cell, the disclination lines extend asymmetrically to the rubbing direction on the glass substrates because of the pretilt angle of the LC molecules. 2 Characteristics of the rubbing process It has been explained quite often in papers and books related to LCDs that rubbing has many problems, such as the generation of static electricity and dust. However, it is still the dominant alignment process for manufacturing LCDs.

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