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>> Performance Analysis of LCD Polarizer and Its Main Influencing Factors 28th,Mar,2017
The optical properties of the polarizer include: polarization, transmittance and hue of the three main performance indicators, the other also includes anti-ultraviolet performance and semi-permeable polarizer semipermeable membrane transmittance, total reflectivity and diffuse reflectance index The In the general use of LCD products, the requirements of the degree of polarization and transmittance performance indicators as high as possible. Polarity and transmittance higher, LCD display device display efficiency is higher, the relative energy consumption is small. However, for conventional iodine-stained polarizer products, the degree of polarization and transmittance is a contradiction, the higher the degree of polarization, the lower the transmittance, but also by the hue constraints, so the general type of polarized The degree of polarization of the product is between 90% and 99%, and the transmittance is between 41% and 44%.
Guangdong Polaroid Polarization Equipment Co., Ltd. production of "blessed" brand polarizer general-purpose PLN products, the degree of polarization of 97% or more, the transmittance of 43%, while the durable, high contrast PMN product polarization in 99.9% Or more, the transmittance is 42% or more. Hue indicators mainly to meet people's visual habits, while requiring polarizer products to reduce the color tone to ensure that the final appearance of the LCD product appearance of the consistency, which is mainly by the polarizer product color coordinate parameters L, a, b value and Their control tolerance range to identify, the general scope of its control tolerance as small as possible.
Guangdong Polaroid Polarization Equipment Co., Ltd. production of "blessed" brand polarizer general-purpose PLN products, the degree of polarization of 97% or more, the transmittance of 43%, while the durable, high contrast PMN product polarization in 99.9% Or more, the transmittance is 42% or more. Hue indicators mainly to meet people's visual habits, while requiring polarizer products to reduce the color tone to ensure that the final appearance of the LCD product appearance of the consistency, which is mainly by the polarizer product color coordinate parameters L, a, b value and Their control tolerance range to identify, the general scope of its control tolerance as small as possible.
Polarization of the durability of technical indicators, including high temperature, heat resistance, low temperature and resistance to cold and heat shock four technical indicators, the most important of which is the level of resistance to heat and humidity performance. High temperature refers to the polarizing film temperature at constant baking temperature working conditions, the current level according to the polarizer, usually divided into general-purpose: Operating temperature of 70 ℃ × 500HR; Durable: Operating temperature of 80 ℃ × 500HR; high durability: the working temperature of 90 ℃ × 500H above the three levels. Damp-heat technical indicators refers to the polarizer in the constant temperature and humidity conditions, hot and humid work performance, it is usually divided into three technical levels, both general-purpose: hot and humid working conditions for the 40 ℃ × 90% RH × 500HR; : Hot and humid working conditions for the 60 ℃ × 90% RH × 500HR; high durability: hot and humid working conditions: 70 ℃ × 95% RH × 500HR above. Since the PVA film constituting the polarizing film and the iodine and iodide are both highly hydrolysable materials, and the pressure-sensitive adhesive used for the polarizer is liable to deteriorate under high temperature and high humidity conditions. Therefore, The most important of the technical indicators is the high temperature and humidity resistance indicators, if the high temperature and humidity indicators through the other durability indicators are usually not a problem.
Polarizing film bonding characteristics of technical indicators mainly refers to the polarizer pressure-sensitive adhesive characteristics, generally include: pressure-sensitive adhesive and glass substrate between the peel force, pressure-sensitive adhesive and stripping between the peel force, polarizer protection The peel strength between the membrane and the polarizer, and the adhesive durability of the pressure sensitive adhesive. The peel strength between the pressure-sensitive adhesive and the glass substrate is also known as the adhesive strength of the adhesive, which is the most important adhesive characteristic of the LCD polarizer product. This technical indicator is usually measured by the EIAJ-ED-2521A standard of the Japan Electromechanical Industry Association. It is usually expressed in g / 25mm, and the peeling force of the LCD polarizer on the glass substrate is usually set at 500g / 25mm or more , While the actual use of the upper limit is generally below 1000g / 25mm. As a practical example, when the peeling force of the adhesive to the glass substrate is 500 g / 25 mm or less, the phenomenon that the polarizer is automatically peeled and warped after bonding on the surface of the glass sheet occurs.
Polaroid appearance of the technical indicators mainly refers to the polarizer product surface roughness and the appearance of the number of points, these technical indicators mainly affect the polarizer products in the chip when the utilization rate. These technical indicators in the polarizer industry usually have a more consistent technical requirements, generally for each polarizer products (500 × 1000 mm) 15 less than 150μm less than the point. As the polarized film products are the final appearance of the inspection is to use manual visual inspection, so polarizing film products in the mass production process, the appearance of the distribution of the point will have a certain discrete distribution, which, each polarizer production enterprises are using a certain Of the internal control specifications and delivery specifications to ensure the difference between the delivery quality standards. However, it should be noted that since the 150μm is close to the human eye to distinguish the minimum limit, especially in the industrial mass production process, the inspectors in the long-term operation will produce visual fatigue, so 150μm overexposure standard is more reasonable Credible
The main influencing factors that affect the optical performance of the polarizer include: the choice of polarizing film material, the choice of dyeing material, the polarization film dyeing, the choice of drawing process conditions and the limitation of equipment capacity. These are related to the core technology of polarizer production, so polarizer manufacturers of these materials and process conditions are very cautious choice, generally will not easily change. Once the polarizer manufacturer's products are approved by the customer, the polarizer manufacturer will adopt strict production quality management measures to ensure the stability of the optical properties of the polarizer product.
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