Nowadays the most common polarizing film is Rand H invention, the sheet 1938 years , which was prepared as follows : First, the chemical activity of a soft rich transparent plastic plate ( usually PVA) immersed in I2 / KI aqueous solution , several within seconds, a lot of iodine ion diffusion penetrate the inner PVA, micro-heat by manual or mechanical stretching until multiple lengths , PVA panels also become narrow and variable-length thin , PVA molecules originally irregularity at any angle distribution , after the tensile force uniformly gradually deflected in the direction of force ,Lcd display module attached to the PVA with the iodide ions with directional, iodide ions to form a long chain . As iodine ions have a good bias effect , it can absorb the light beam parallel to the arrangement direction of the electric field component so that only the vertical direction by the electric field component of the beam , the principle can be manufactured using such a polarizing film .
Type polarizing film used today
Polarizing a wide range of applications , not only can use the LCD as a polarizing material can be used for sunglasses , anti-glare goggles, photographic equipment of the filter , mini lcd
module auto headlight glare treatment and the amount of light regulator, there are other polarizing microscope with glasses with special medical
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