Light is an electromagnetic wave in which its waves and magnetic waves cannot be separated from each other. The three of the three are the vertical relationships between the electric field, the magnetic field and the direction of the electromagnetic wave. Generally, natural light is a light wave that vibrates uniformly in the 360-degree direction and is completely uniform in the 360-degree direction. We call it the non-polarized light.

To get polarized light, we usually need some devices, which are mainly divided into the following types:

1. Type of reflection:

When the light is inclined on the glass surface, the reflected light will be partially polarized. By using the continuous reflection effect of multilayer glass, non-polarizing light can be transformed into linear polarized light.

2. Complex bending type:

Two pieces of calcite crystals come together and the incident light is broken down into two polarized lights, called ordinary light and extraordinary light.

3. Two Microcrystalline Chromatics:

Tiny two-color crystals are regularly absorbed on transparent sheets. This is the first man-made polarizing film method.

4. Two chromaticities of the polymer:

Using a good polarizing polymer film, molecules are directed and adsorbed with two chromaticity substances. It is usually called polarization or polarizer film. Another popular term in English is a polarizing filter.

Type of polarizing film

At present, there are many types of polarizer film on the market, but according to their polarizing materials, they are mainly classified in the following categories:

Metallic polarizing film Metallic:

Salts such as gold, silver, and iron are adsorbed on the polymeric film and then reduced to make the rod similar to the distorted metal. At the moment only one reflector can be applied such as a reflective polarizer film.

Iodized polarizing film:

The iodine molecules are adsorbed on PVA and then extended to orient them so that they have polarized optical properties. It is one of the main types of polarizer market and its production technology has been matured. The advantage is that the transmittance and the degree of polarization are high, and the degree of polarization of the theoretical value is close to 100% and the transmittance is 50%. The disadvantage is that the polarization performances of the iodine molecule are easily damaged at high temperatures and at high humidity, and the resistance to atmospheric agents is poor.

Polarizing film of the dyeing system:

The two-color organic dyes were adsorbed on PVA and then extended to orient them so that they had partial rotation properties. It is also one of the main types of polarizer market. The advantages are good weather resistant, often used on products with high reliability, but it is difficult to obtain a high degree of polarization and transmittance and the price is higher than that of the iodine molecule polarizer.