Alignment of AFLC

To obtain high contrast, AFLC alignment without defects must be realized. Moreover, to realize the stable grey scale expression of the high duty ratio by simple matrix driving, large hysteresis and sharp threshold characteristics are indispen-sible. These characteristics are determined not only by the AFLC material properties, but also by the quality of the alignment states. 

To obtain good initial alignment, varieties of polyimide materials for the alignment layer were investigated.The mmetry of the polymer molecules is critically important. In Table 6.2.1 [11], the molecular structures of polyimide materials, the evaluation of the alignment state and the contrast ratios of AFLCDs using the polyimides are shown. 

Effect of polyamide-imide structure on alignment properties 

Furthermore, aromatic polyimides can produce better alignment than aliphatic 

Other aspects described below were pointed out. 

5 2005 Kohki Takatoh, Masaki Hasegawa, Mitsuhiro Koden, Nobuyuki Itoh, Ray Hasegawa and Masanori Sakamoto 

---