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

By Kohki Takatoh

ISBN-10: 0203970403

ISBN-13: 9780203970409

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Ne¤el wall A Ne¤el wall appears after injecting the LC into the display panel because of the effects of the LC flow during injection. The alignment situation for the Ne¤el wall is shown in Fig. 30. Usually the panels are heated to around 100  C to cancel the flow alignment effect during the injection process. If the anchoring energy is strong enough, all of the Ne¤el wall disclinations vanish, but when the anchoring energy is weak or when impurities are attached to the surface of the alignment membrane, some disclinations will remain.

Ne¤el wall A Ne¤el wall appears after injecting the LC into the display panel because of the effects of the LC flow during injection. The alignment situation for the Ne¤el wall is shown in Fig. 30. Usually the panels are heated to around 100  C to cancel the flow alignment effect during the injection process. If the anchoring energy is strong enough, all of the Ne¤el wall disclinations vanish, but when the anchoring energy is weak or when impurities are attached to the surface of the alignment membrane, some disclinations will remain.

These defects cannot be detected without applying a voltage. 40 Masaki Hasegawa 2. Pretilt angle fluctuation Pretilt angle fluctuations may be caused by variations in the dispersion speed of the polyimide solvent, or caused by unevenness in the rubbing strength. Recently developed polyimides for the alignment layer consist of several components to control the contact specifications, affecting such properties as the alignment and electrical characteristics. These components may become separated because of changes in the volatility of the solvent.

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