Twisted FLC mode

The author would like to propose another method of determining the alignment layer polarity. In this method, the cell structure of the twisted FLC mode described in Ref. 35 is used. Consider the cell structure for which the rubbing directions on the top and bottom plates are set rectangularly, as shown in Fig. 5.2.9. A ferroelectric liquid crystal of 45° tilt angle, showing no smectic... 

Fig. 5.2.9 The relationship between layer direction and the polarity direction of the alignment layers in the twisted FLC mode when the sign of the spontaneous polarization is negative.

Among these modes, (2) DHF mode, (3) twisted FLC mode, (4) monostable FLC mode, (8) CDR mode, (5) the application of Parallel Stripe Texture and (9) the application of the frustoelectric liquid crystalline phase are reviewed below. 

In Table 6.3.1, four kinds Twisted FLC mode cells are listed with rubbing directions from Fig. 6.3.13. In cells II and IV, two kinds of domains can be observed in the same ratio and defects are observed between these domains. Among the characteristics observed with respect to the defects between these two domains are ... 

Table 6.3.1 Four kinds of Twisted FLC mode cells...

The helix pitch value Ro is easily controlled by varying the concentration of a chiral dopant in a smectic C matrix. To provide variation of the helix pitch from 0.1 fim to 100 m and more, we should have a chiral dopant with a high twisting power and good solubility. At the same time, the chiral dopant should not depress the smectic C temperature range [11]. Moreover, the growth of polarization should be more pronounced than that of the rotational viscosity 7<, with an increasing concentration of the chiral dopant. Various types of chiral dopants are presented in [11], and some of them were used to reveal the novel electrooptical modes in FLCs [22]. 

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