Polarizer

According to the polaroid disclosed by the invention, the polarizing functional layer is bonded with the protective film through the bonding layer. On one hand, the film layer with the water absorption rate smaller than 3% is adopted as the bonding layer, the water vapor transmittance of the bonding layer can be reduced, the waterproof performance of the bonding layer is improved, and therefore the probability that water vapor penetrates through the bonding layer and makes contact with the polarization function layer is reduced. And on the other hand, the waterproof layer is arranged on the surface, far away from the bonding layer, of the polarized functional layer, so that water can be blocked from two surfaces of the polarized functional layer. The polarization function layer is arranged on the surface, far away from the polarization function layer, of the compensation layer, and can also play a water blocking role on the compensation layer. And the dilution rate of the water-blocking layer is less than 3%,