The optical properties of the polarizer include three main performance indexes: polarizability, transmittance and tone, as well as UV protection and transmittance, total reflectance and diffuse reflectance of the semi-permeable film of the polarizer. In the use of general LCD products, the higher the polarization and transmittance, the better. The higher the polarization and transmittance, the higher the display efficiency of the LCD display device and the lower the relative energy consumption. However, for the polarizing products dyed with conventional iodine, the polarizing degree and transmittance are a pair of contradictions. The higher the polarizing degree, the lower the transmittance will be, and also subject to the constraints of tone. Therefore, the polarizing degree of the general polarizing products is between 90% -- 99% and the transmittance is between 41% and 44%. Tonal indicators mainly to satisfy people's visual habit, also requires polaroid product color deviation is smaller, to ensure the consistency of the end product appearance color LCD, it mainly by the polaroid products chromaticity coordinate parameters of L, a, b value and their control to identify the tolerance range, generally the scope of its control tolerance as small as possible.

The durability technical indexes of the polarizer include high-temperature resistance, damp resistance, low-temperature resistance, and cold and hot impact resistance. High-temperature resistance refers to the temperature resistance working conditions of the polarizer at a constant baking temperature. At present, according to the technical level of the polarizer, it is generally divided into general type: working temperature is 70℃×500HR; Medium endurance: working temperature: 80℃×500HR; High durability: the operating temperature at 90℃×500H above these three grades. The technical index of moisture and heat resistance refers to the working performance of the polarizer under constant temperature and humidity conditions. It is usually divided into three technical grades, which are universal: working conditions of moisture and heat: 40℃×90%RH×500HR;Medium endurance: 60℃×90%RH×500HR;High endurance: hot and humid working conditions: above 70℃×95%RH×500HR.Due to constitute the basic materials of polarizing film containing PVA membrane and iodine and iodide are easy to hydrolysis of materials, and at the same time because the polaroid USES pressure-sensitive adhesive under high temperature and high humidity conditions also easy degradation, therefore, in the most important technical indicators of the durability of the polaroid is hot and humid indexes and high-temperature resistance, if resistance to heat and humid indexes through, other type durability index usually won't be a problem.

The main factors influencing the optical performance of polarizing film include the selection of polarizing film material, the selection of dyeing material, the selection of polarizing film dyeing, the selection of stretching process conditions and the limitation of equipment capability. These involve the core technology of polarizer production, so polarizer manufacturers are very cautious about the selection of these materials and technological conditions, generally will not be easily changed. Once the product of the polarizer manufacturer is approved by the customer, the polarizer manufacturer will take strict production quality management measures to ensure the stability of the optical performance of the polarizer product. The technical indexes of the durability of polarizing products actually include two durability indexes: the durability of polarizing film and the durability of pressure-sensitive adhesive. The main factors influencing the durability of the polarized film include the selection of basic materials, the selection of dyeing materials, the process conditions of polarized film dyeing, stretching and compounding.

Performance and technology of polarizing plate for Lcd