The Fig. shows the field effect liquid crystal cell. It consists of two glass plates, a liquid crystal fluid, polarizers and transparent conductors. The liquid crystal
fluid is sandwiched between two glass plates. Each glass plate is associated with light polarizer. The light polarizers are placed at right angle to each other. In the absence
of electrical excitation, the light coming through the front polarizer is rotated through
900 in the fluid and passed through the rear polarizer. It is then reflected to the viewer by the back mirror as shown in Fig.