Polarizer Test Conditions

Polarizer Test Conditions

Polarizer is one of the basic parts of the liquid crystal display, is a light plate that only allows a certain direction of light to pass through, in the process of making the liquid crystal plate, must be used above and below each piece, and into the staggered direction placed, mainly used for electric field and no electric field when the light source produces a phase difference and the state of light and dark, to display subtitles or patterns.

Relevant test conditions:

Because the molecular structure of iodine is easy to destroy under high temperature and humidity conditions, the durability of the polarizer produced by iodine dyeing technology is poor, and generally can only meet:

High temperature: 80℃×500HR

Hot and humid: working conditions below 60℃×90%RH×500HR

However, with the expansion of the use of LCD products, the wet and hot working conditions of polarizing products are becoming more and more demanding, and there has been a demand for polarizing plate products that work at 100 ° C and 90%RH conditions, and the highest conditions at present are:

High temperature: 105℃×500HR

Humidity and heat: test requirements below 90℃×95%RH×500HR

The durability test of polarizer includes four test methods: high temperature, wet heat, low temperature and cold and heat shock, of which the most important test is the wet and heat test. The high temperature test refers to the high temperature working conditions of the polarizer at a constant baking temperature. At present, according to the technical grade of the polarizer, it is divided into:

Universal type: working temperature is 70℃×500HR;

Medium durability type: the working temperature is 80℃×500HR;

High durability type: the operating temperature is 90℃×500H above these three grades.

Because the basic materials of the polarizing film PVA film and iodine and iodide are easily hydrolyzed materials, but also because the pressure sensitive adhesive used in the polarizing plate is also easy to deteriorate under high temperature and high humidity conditions, the most important things in the environmental test of the polarizing plate are high temperature and wet heat.