Download PDF by Kohki Takatoh: Alignment technologies and applications of liquid crystal

By Kohki Takatoh

ISBN-10: 0203970403

ISBN-13: 9780203970409

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This means that the average optical axis is perpendicular to the substrate. Since the polymer inclination and the LC pretilt angle agree well with each other, the LC tends to align almost parallel to the side chain of the polymer. For the case of polymers used for homeotropic alignment, the retardation before rubbing had an extremum of 0 nm at normal incidence. This can be modeled with an index ellipsoid processing an optical axis parallel to the direction normal to the surface. It can be concluded that the pretilt of the LC is mainly caused by the tilted orientation of the polymer molecules aligned by the rubbing treatment [32, 57].

13. The conformation of PMDA-C8 is determined as a cis-transoid type. As for PMDA-C7, a trans-cisoid type conformation of the polymer chain is a possible structure on the substrate surface. The incident angle dependence of the peak intensity for PMDA-C8 and PMDA-C7 polyimides is shown in Fig. 14. The inclination of the aromatic core part has been calculated to be 25. In contrast to the case of PMDA-C8, the aromatic part of BPDA-C8 selectively tilts toward the rubbing direction. Experimental results strongly suggest that the all-trans-structure of BPDA-C8 is formed on the substrate.

These differences are caused by the origin of each defect. Knowing the characteristics and origin of each defect Rubbing Technologies: Mechanisms and Applications 37 is important in order to manufacture LCDs without these defects. Here, we will introduce the origin and structure of the typical disclinations and alignment defects of the twisted nematic (TN) configuration of LCDs. 1 Disclinations Ne¤el walls, twist- and tilt-reverses are the three major disclinations in actual LCDs. A Ne¤el wall disclination may be caused by weak azimuthal anchoring.

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Alignment technologies and applications of liquid crystal devices by Kohki Takatoh


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