Download Alignment Technologies and Applications of Liquid Crystal by Masanori Sakamoto PDF

By Masanori Sakamoto

ISBN-10: 0748409025

ISBN-13: 9780748409020

Alignment phenomena are attribute of liquid crystalline fabrics, and figuring out them is seriously vital in knowing the fundamental positive factors and behaviour of liquid crystals and the functionality of Liquid Crystal units (LCDs). moreover, in liquid crystal display construction traces, the alignment method is of sensible value. Alignment applied sciences and functions of Liquid Crystal units demonstrates either the elemental and sensible features of alignment phenomena in liquid crystals. The actual foundation of alignment phenomena is first brought so that it will reduction the certainty of a number of the actual phenomena saw within the interface among liquid crystalline fabrics and alignment layer surfaces. equipment for the characterization of surfaces, which result in the alignment phenomena, and of the alignment layer itself are brought. those equipment are valuable for the study of liquid crystalline fabrics and units in educational examine in addition to in undefined. within the sensible sections, the alignment equipment utilized in the liquid crystal display construction traces are brought with a number of different trials for the alignment applied sciences. liquid crystal display performances also are mentioned with regards to alignment phenomena.The authors have a variety of event in either educational learn and in undefined. This ebook may 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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Example text

Impurity attached to surface LCDs consist of many types of materials. The LCs, the TFTs which are made of metals, the glass substrates, the alignment polyimides, the epoxy glue for sealing, the spacers made of plastic, and the colour filters made of acrylic resins. 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.

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. Understanding the characteristics of the process is very important to control the alignment process. Here, we will introduce the characteristics of the rubbing process, and the materials used in the alignment process for LCDs.

The retardation increased with rubbing strength, and became saturated. The slow axis of polystyrene was perpendicular to the rubbing direction, although the axis of the other polymers was parallel. They also studied the alignment of an LC aligned by films which are made of elongated bulk polymers, and showed that the crystallized polymers aligned the LC without rubbing [5]. The incident angle dependence of the optical retardation of polyimide films on quartz substrates is shown in Fig. 8. ] (b) Fig.

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