Physical Chemistry

New PDF release: Alignment Technologies and Applications of Liquid Crystals

By Kohki Takatoh, Masanori Sakamoto, Ray Hasegawa, Mitsushiro Koden, Nobuyuki Itoh, Masaki Hasegawa

ISBN-10: 0748409025

ISBN-13: 9780748409020

Written via a bunch of authors, who've released widely within the foreign study literature, the ebook takes a close examine a serious point of Liquid Crystal expertise - the alignment features and homes of the fabrics utilized in the development and use of LCDs. The publication examines the chemical, actual and mechanical homes of the fabrics and relates them to functional functionality concerns within the sleek Liquid Crystal. This authoritative sourcebook should be of serious price for all fascinated about the sensible and theoretical problems with alignment phenomena in Liquid Crystals.

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Extra resources for Alignment Technologies and Applications of Liquid Crystals

Example text

In the case of the main chain type polymers, the rubbing stress causes an asymmetric zigzag structure of the main chains. In the case of side chain type polymers, the tilt angle of the main chain increases with the length of the side chain. A larger tilt angle for the main chain was generated by a side chain that gets into the bulk below the surface. Opinions on the mechanism of the pretilt angle of the LC in the case of polyimide with side chains are divided. One view is that it is directly caused by the side chains and another view is that it is caused by the main chains as shown in Fig.

Suggested a model where the rubbing effect is local and not uniform, and the temperature of the hot spots caused by textile buffing was estimated to be 230  C and its radius r was estimated at 2 mm [25]. The temperature at the hot spot exceeds the Tg of the polyimide, and it melts and reorients in the rubbing direction at the hot spot. The distance between each hot spot is estimated to be 20 mm, and this is shorter than the long range interaction. Therefore, the alignment of the LC by the hot spots affects the effective range of other areas of the surface, and aligns the bulk LC [25].

Therefore, the effect of this fringe field increases, and the pretilt angle should be large. A large pretilt angle is usually generated by using a polyimide having long alkyl side chains as the alignment material. 3. Twist-reverse To fix the twist direction of the twisted nematic (TN) display mode, several methods are used. One is to add a small amount of a chiral agent. A typical chiral pitch for the 5 mm gap TN mode is 100 mm. The other method involves the rubbing direction. The rubbing direction determines the inclination direction of the LC, and it is selected so as to avoid a splay alignment as shown in Fig.

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Alignment Technologies and Applications of Liquid Crystals by Kohki Takatoh, Masanori Sakamoto, Ray Hasegawa, Mitsushiro Koden, Nobuyuki Itoh, Masaki Hasegawa

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