By Kohki Takatoh, Masanori Sakamoto, Ray Hasegawa, Mitsushiro Koden, Nobuyuki Itoh, Masaki Hasegawa
Written by way of a bunch of authors, who've released broadly within the foreign study literature, the publication takes an in depth examine a severe point of Liquid Crystal expertise - the alignment features and houses of the fabrics utilized in the development and use of LCDs. The booklet examines the chemical, actual and mechanical houses of the fabrics and relates them to useful functionality concerns within the glossy Liquid Crystal. This authoritative sourcebook could be of significant price for all enthusiastic 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
1 Process Two types of polyimide are used for actual devices; solvent soluble pre-imidized polyimide and polyamic acid type. Though the pre-imidized polyimide is already imidized, a baking process is required for both type of polyimide. The alignmentrelated process consists of a coating of polyimide, a baking step, rubbing, and cleaning of the substrates. The sensitivity of the alignment material to the manufacturing process conditions is one of the important issues when selecting it for manufacturing use.
15 Incident angle dependence of the peak intensity for (a) BPDA-C8 and (b) BPDA-C7 polyimides. Model structures of (c) BPDA-C8 (trans-transoid) and (d) BPDA-C7 (trans-cisoid). Reproduction by permission from . 6 23 Infrared (IR) absorption measurements Although a transmittance IR absorption spectrum measurement evaluates the bulk of the alignment material, the distribution of the alignment of the molecules can be determined by a qualitative analysis by changing the polar and azimuthal angles of the sample.
Developing a method to monitor the rubbing status of the alignment layer in situ has been a high priority goal. Recently, the optical retardation measured by reflective ellipsometry has been used for monitoring the rubbing condition in situ. The printing and baking of the alignment layer also affect the pretilt angle of the LC. Therefore, the LC manufacturer chooses an alignment material that shows little change in the LC alignment condition due to undulations. How strictly do we need to control the LC alignment to keep the electro-optical characteristics of the panel uniform?