The Performance Of Liquid Crystal Polarizer Sheet

  The optical characteristics of the polarizer include: polarizer, transmittance and tone three main performance indicators, the other includes anti-ultraviolet performance and semi-transmissive polarizer semi-transmissive film transmittance, total reflectance and diffuse reflectance indicators.

  The durability technical indicators of the polarizer include high temperature resistance, moisture resistance and heat resistance, low temperature resistance and cold and heat shock resistance. High temperature resistance refers to the polarizer during constant baking, the temperature under heat-resistant working conditions, according to the current polarization The level of device technology is usually divided into general types: working temperature is 70 °C x 500, durable type: working temperature is 80 °C x 500; high durability type: working temperature above 90 °C x 500 h, these three levels , The technical index of moisture resistance and heat resistance refers to the moisture resistance and heat resistance of the polarizer, under constant temperature and humidity. As the basic material of the polarizing film, the material containing PVA film, iodine and iodide is easy to be hydrolyzed, and at the same time, Because polarons use pressure-sensitive adhesives at high temperatures, and high humidity conditions are also easy to degrade, therefore, the most important technical indicators are the persistence of polarization, and humidity indicators and high temperature resistance, if heat and humidity resistance index Pass, other types of durability indexes usually won't be a problem.

 The technical indicators of the adhesion characteristics of the polarizer mainly refer to the various characteristics of the pressure-sensitive adhesive of the polarizer, including the peeling force between the pressure-sensitive adhesive, and the glass substrate, the peeling force between the pressure-sensitive adhesive and the peeling film, the polarizer The peeling force between the protective film and the polarizer, and the adhesion durability of the pressure-sensitive adhesive. The debonding force between the pressure-sensitive adhesive and the glass substrate is also called the bonding strength, which is the most important bonding characteristic index of the LCD polarizer . This technical indicator is usually measured by the Japanese. , Electromechanical Industry Association specifications, expressed in g25 mm as the unit. Generally, the pressure-sensitive peeling force of liquid crystal polarizing polarizers, the adhesive on the glass substrate is above 500g/25mm, and the actual upper limit is generally less than 1000g/25mm. A practical example shows that when the debonding force of the adhesive on the glass substrate is less than 500g/25mm, automatic de-angle and warping will occur, after the polarizing plate is bonded on the surface of the glass screen.

  The appearance performance technical indicators of the polarizer mainly refer to the surface roughness and the number of appearance defects of the polarizer products. These technical indicators mainly affect the utilization rate of the polarizer products in the SMT. The technical indicators of the polarization sub-industry are usually relatively consistent According to technical regulations, the point below 15 of each polarizer's general product (500 X 1000 mm) should not exceed 150 microns. Because the final appearance inspection of polarizer products adopts manual visual inspection, in the mass production of polarizer products, there will be There is a certain discrete distribution of appearance defects. For this reason, every polarizer manufacturer has a certain difference between internal control specifications and delivery specifications to ensure, delivery quality standards. It should be noted that, However, the 150 m threshold is quite reliable because it is close to the minimum limit of human visual resolution, especially in industrial mass production, where inspectors may experience visual fatigue during long-term operation