By Kohki Takatoh, Masanori Sakamoto, Ray Hasegawa, Mitsushiro Koden, Nobuyuki Itoh, Masaki Hasegawa
Written through a bunch of authors, who've released generally within the overseas study literature, the e-book takes a close examine a severe element of Liquid Crystal know-how - the alignment features and houses of the fabrics utilized in the development and use of LCDs. The booklet examines the chemical, actual and mechanical homes of the fabrics and relates them to useful functionality concerns within the smooth Liquid Crystal. This authoritative sourcebook may be of significant worth for all occupied with the sensible and theoretical problems with alignment phenomena in Liquid Crystals.
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Extra info for Alignment Technologies and Applications of Liquid Crystals
150 (b) (c) (d) Fig. 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.
Fluorinated LCs are often used for the LCD panels because of their high resistivity, and their dispersion constant is very small, making it hard for the impurities to disperse into the bulk of the LC. The impurities migrate in response to the DC component of the driving voltage, which moves them towards the surface where they are absorbed. The alignment strength of the surface that absorbs the impurities is thereby weakened, and this causes alignment defects. 4. Injection hole Since the LC injection speed near an injection hole is very high, alignment defects frequently appear in this area.
How strictly do we need to control the LC alignment to keep the electro-optical characteristics of the panel uniform? 36 shows the relation between applied voltage and transmittance when the pretilt angle is changed from 2 to 4 . It shows only a 2% change in the grey level, and this level is acceptable. 37 shows the relation between rubbing strength and the pretilt angle for two types of alignment materials. The type A material shows only a 1 change, and can be used for production. How large is the effect of anchoring strength on the LC panel characteristics?
Alignment Technologies and Applications of Liquid Crystals by Kohki Takatoh, Masanori Sakamoto, Ray Hasegawa, Mitsushiro Koden, Nobuyuki Itoh, Masaki Hasegawa