The light in nature is electromagnetic waves (EW) which travels with the wave oscillations perpendicular to the direction of propagation. A polarizer or polarizing film is a component used to pass only a specific polarization direction of EW. Polarizers are essential parts of modern display devices such as TFT LCD and AMOLED. The current display industries use polarizing films made by polyvinyl alcohol first being adsorbed with iodine, then stretching and orientating it. This process induces the film polarization characteristics that only light with a certain oscillation direction can pass through. These polarizing films are easy to be manufactured in large sizes and relatively low cost. However, since they used organic dyes to realize the polarizing characteristics, stability at high temperature and life time are always issues.
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