By Masanori Sakamoto
Alignment phenomena are attribute of liquid crystalline fabrics, and figuring out them is seriously very important in realizing the fundamental gains and behaviour of liquid crystals and the functionality of Liquid Crystal units (LCDs). moreover, in liquid crystal display construction traces, the alignment procedure is of useful significance. Alignment applied sciences and functions of Liquid Crystal units demonstrates either the elemental and useful elements of alignment phenomena in liquid crystals. The actual foundation of alignment phenomena is first brought with a view to reduction the knowledge of a few of the actual phenomena saw within the interface among liquid crystalline fabrics and alignment layer surfaces. tools for the characterization of surfaces, which result in the alignment phenomena, and of the alignment layer itself are brought. those equipment are important for the examine of liquid crystalline fabrics and units in educational study in addition to in undefined. within the sensible sections, the alignment tools utilized in the liquid crystal display creation traces are brought with a variety of different trials for the alignment applied sciences. liquid crystal display performances also are mentioned relating to alignment phenomena.The authors have a variety of adventure in either educational examine and in undefined. This booklet could be of curiosity to researchers and engineers operating within the liquid crystal display undefined, and for physics and chemistry researchers learning liquid crystalline fabrics.
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Extra resources for Alignment Technologies and Applications of Liquid Crystal Devices
Many of these materials contaminate the LC with impurities that cause alignment defects. Impurities in the LCD panels may be solid or volatile. Solid impurities disturb the LC alignment by their physical presence, while volatile impurities affect the alignment membrane surface. Suspected solid impurities can be confirmed by microscopic observation when a defect is found, but volatile impurities cannot be seen. Such impurities are attached to the substrates before the alignment layer coating step, blocking the polyimide, and this affects the alignment process.
18 shows the relationship between the pretilt angle of the LC and the inclination angle of the polyimide main chain. 19 shows the relationship between the water contact angle and the number of carbon atoms in the side chains of the polyimides. A larger contact angle corresponds to a more hydrophobic surface. Therefore, the rubbing process might reduce the number of alkyl side chains exposed on the surface. It was concluded that alkyl chains do not directly affect the pretilt angle generation, since it was confirmed by the contact angle measurements that alkyl side chains orient inwards .
2005 Kohki Takatoh, Masaki Hasegawa, Mitsuhiro Koden, Nobuyuki Itoh, Ray Hasegawa and Masanori Sakamoto 44 Masaki Hasegawa The rubbing machine is covered with a hood, and an exhaust fan is used to prevent the diffusion of the dust from the rubbing cloth and alignment material. After the rubbing process, a cleaning process is used to wash away particles of the rubbing cloth and alignment material from the surface of the substrate. 2. Uniformity The rubbing process controls not only the alignment direction, but also the pretilt angle of the LC.