What is a polarizer?
The full name of the polarizer is a polarizing film. The imaging of the liquid crystal display must rely on polarized light. All the liquid crystals have two polarizing plates in front and rear close to the liquid crystal glass to form a liquid crystal film with a total thickness of about 1 mm.
If any polarizer is missing, the LCD will not display the image.
The polarizer is called a polarizer because the polarizer facing the eye of a conventional liquid crystal display is frosted to dissipate the surface and scatter light to increase the viewing angle of the liquid crystal display. For the projector, any scattering will cause loss of light. The ideal state of the liquid crystal for the projector should be 0 degree angle of view, that is, when the liquid crystal is viewed from the vertical direction, there is no light. Of course, this is impossible to achieve, but the closer to the 0 degree angle of view, the higher the utilization of light, so after replacing the frosted polarizer with a flat polarizer, the brightness of the projector to the wall will be greatly improved. Probably can increase by 50-80%, which is why you should change the polarizer.
Iodine-based polarizer: It is easy to obtain optical properties of high transmittance and high degree of polarization, but it is inferior in resistance to high temperature and high humidity.
Dye-based polarizers: Optical properties of high transmittance and high degree of polarization are not easily obtained, but the ability to withstand high temperatures and high humidity is good.