The Material And Function Of Each Layer Of Lcd Polarizer
Sep 13, 2018
Polarizing layer: It is made by dyeing and stretching PVA (polyvinyl alcohol) film, which is the main part of polarizer, also called polarizing film. The polarizing layer determines the polarizing performance and transmittance of the polarizer, and is also a major part of the color tone and optical durability of the polarizer. The basic processing technology of the polarizing layer can be divided into two series of dyeing and iodine according to the dyeing method. According to the stretching process, it can be divided into two series: dry stretching and wet stretching. The materials and processing techniques can be changed. Adjustment of polarization, transmittance, hue and optical durability.
TAC layer: The polarizing layer made of PVA film is easy to absorb water, fade and lose polarization. Therefore, it is necessary to use a layer of TAC (cellulose triacetate) film with good optical uniformity and transparency to isolate moisture and air on both sides. Protect the polarizing layer. An anti-ultraviolet polarizer and an anti-glare polarizer can be produced by using a TAC film having an ultraviolet (UV CUT) and an anti-glare effect.
Adhesive: It can be divided into a reflective film side adhesive and a release film side adhesive. The function of the reflective film side adhesive is to firmly bond the reflective film to the TAC film, and the process requirements do not allow re-peelability. The peeling film side adhesive is a laminated sensitive adhesive, which determines the adhesive performance and the processing property of the polarizer, and its performance is one of the most concerned problems for the user of the lcd polarizer.
Separate film: a PET (ethylene terephthalate) film coated with a silicon coating on one side, mainly for protecting the pressure-sensitive adhesive layer, and the peeling force is the same for the LCD patch. The workability has a certain impact.
Protective film: A PE (polyethylene) film coated with an EVA layer (ethylene vinyl acetate copolymer) on one side, which has a low viscosity and functions to protect the surface of the TAC film.
Reflective film: A PET film that is a single-sided evaporated aluminum. Currently, a non-directional reflective aluminum film is often used. If the reflective film is replaced with a transflective film, a transflective polarizer can be fabricated. In addition, various gold plating, silver plating film, and laser film can be used as the reflective film to obtain various background colors and mirrors. Reflection and other effects.
Main performance indicators of lcd polarizer
1. Absorbing axis direction There are two main types of polarizers for LCD sales. If the polarizer is supplied to the LCD manufacturer in a special size, the optical axis should be marked or described.
2, Transmittance Transmittance Transmittance indicators can be divided into single (single), parallel (Parallel), straight (Crossed) three items. It is usually measured in accordance with JIS-Z-8701 using an integrating sphere spectrophotometer. The monomer transmittance refers to the transmittance and parallel transmittance of the single polarizer.
