Double Cell Nematic Dichroic LCD

The geometry of a double cell nematic dichroic LCD [13-16, 21, 126] is shown in Fig. 21. The liquid crystal mixture generally used is composed of pleochroic dyes in a nematic host of positive dielectric anisotropy. The first cell has a unidirectional homogeneous alignment in one direction, while the second cell has a unidirectional homo-... 

Figure 21. Geometry of a double cell nematic dichroic LCD. (After Seki, et al. [22]).

The geometry is very similar to that of the double cell nematic dichroic LCD, with each cell having a single turn of cholesteric dichroic mixture [23, 24]. 

---