The role of the supervisor. Although a dissertation is an opportunity for you to work independently, you will usually be allocated a member of academic staff as a supervisor. Supervisors are there to help you shape your ideas and give you advice on how to conduct the research for your dissertation.
The TN device consists of the twisted nematic liquid crystal confined between two glass substrates with homogeneous planar orientation: the orientation of the director n on one substrate is rotated by 90 o with respect to n on another substrate.
Such a design induces 90 o twist of the nematic liquid crystal. The cell with twisted nematic LC is placed between two polarizers: the polarizer P on the input end and the analyzer A on the output end of the TN device (Figs.39,40). The director n on the input end is parallel to the transmission axis of the polarizer.