Principle of polarizer in liquid crystal panel
Date:2019-08-20
Polarizer is one of the important components of industrial LCD. Have you ever known about polarizer? Today we will explain the working principle and function of polarizer in industrial liquid crystal panel.
Polarizer is the abbreviation of polarizer. Polarizer is needed for LCD imaging. The two polarizers before and after each LCD screen cling to the LCD glass to form a liquid crystal sheet with a total thickness of about 1 mm. Without any polarizer, the LCD screen can't display images.
According to the function, the polarizer includes transmission polarizer, reflection polarizer, half transmission and half reflection polarizer and compensation polarizer.
According to the polarizing materials, polarizers include the following: metal polarizers directly adsorb gold, silver, iron and other metal salts on the polymer film, and then reduce to make the rod-shaped metal have a certain polarizing ability; Iodine polarizer is based on the combination of PVA and iodine molecules, which has the advantages of high transmittance and high degree of polarization, but its high temperature and humidity resistance is poor. The cost of this polarizer is low, so it has a high market share and a wide range of applications; Dye polarizer is a kind of polarizer that directly adsorbs organic dyes with dichroism on PVA, and then extends and orients them to make them have certain polarizing properties. However, it has low transmittance and degree of polarization, and its advantage is high temperature and humidity resistance, so it is mostly used in automobile, shipbuilding and other industries.
The working principle of polarizer is: because the asymmetric electron density will be produced when the iodine molecules are arranged along the same direction, the polarized light absorption coefficient in different directions is different, if the polarization direction of light and the long axis direction of iodine molecular chain keep 90 °， Then polarized light can pass through. On the contrary, the intensity of the transmitted light will continue to decrease, even to completely cover. Therefore, it can be concluded that the long chain of iodine has good polarizability.
With the large-scale, vehicle, small and medium-sized applications of liquid crystal display, especially in line with the personalized display effect, so in the production and manufacture of polarizer, special materials and processes should be selected to add many new functions to the polarizer.
In the early years, many functions of LCD were limited to offi
