Detailed introduction to the polarizing film of a polarizing microscope
The main function of the polarizing plate of a polarizing microscope is to convert non polarized natural light into polarized light, allowing light perpendicular to the electric field to pass through, allowing the LCD panel to display images normally. The main function of a polarizer is to convert natural light passing through it into polarized light. Polarizer is a sheet-like optical functional material that generates and detects polarized light. Polarizer is a key component that affects the display effect of LCD screens.
Polarizing plate is a type of product that polarizes non polarized natural light and converts it into polarized light. Coupled with the twisting characteristics of liquid crystal molecules, it controls the passage of light, thereby improving the transmittance and viewing angle range, and forming anti glare functions. It is a very important product in the upstream raw material field of the panel, and accounts for about 10% of the raw material cost of LCDTV.
Polarizers are classified by function: transmissive polarizers, reflective polarizers, semi transmissive polarizers, semi reflective polarizers, compensation polarizers
Polarizers are classified by staining method:
Iodine based polarizer: It is easy to obtain optical properties with high transmittance and polarization, but its ability to withstand high temperature and humidity is poor.
Dye based polarizer: It is not easy to obtain high transmittance and polarization optical properties, but it has good resistance to high temperature and humidity
Composition of polarizer
The earliest polarizers mainly consisted of a PVA film in the middle that could generate polarized light, and then a TAV protective film compounded on both sides. In order to facilitate use and achieve different optical effects, polarizer suppliers should comply with the requirements of LCD display manufacturers, and then apply pressure sensitive adhesive on both sides, followed by a release film. This polarizer is a common TN ordinary full transmission polarizer. If one layer of release film is removed and another layer of reflective film is composite, it is the most common reflective polarizer.
The pressure sensitive adhesive used is a high-temperature and moisture-resistant pressure sensitive adhesive, and PVA is subjected to special immersion treatment (dye series products), resulting in a wide temperature polarizer; By adding ingredients that prevent ultraviolet rays from passing through the pressure sensitive adhesive used, a UV resistant polarizer can be made; By combining birefringent optical compensation film on the transmission substrate, a polarizer for STN can be made; By combining a light steering film on the transmission substrate, a wide angle polarizer or a narrow angle polarizer can be produced; Coloring the pressure sensitive adhesive, PVA film, or TAC film used is called a color polarizer. In fact, with the continuous development of new LCD display products, there are more and more types of polarizers.
