Performance And Characteristics Of LCD Polarizer

Optical properties of polarizer include:  polarizer,  transmittance and tone three main performance indicators,   the other includes anti-ultraviolet performance and semi-permeable polarizer semi-permeable film transmittance,  full reflectivity and diffuse reflectivity indicators.  In the use of ordinary LCD products,  the higher the polarimetry and transmittance,  the better.  The higher the polarization and transmittance,  and the lower the relative energy consumption.  Howeve ,  for the polarizer products with conventional iodine staining,  the polarizer and the transmittance are contradictory.  The higher the polarization,  the lower the transmittance will be. Moreover,  they are also subject to color constraints.  Guangdong fudi rihe polarizer co.,  LTD. Produces “fudi” brand polarizer universal PLN products with polarimetry over 97% and transmittance over 43%,  while medium durable,  high contrast PMN products with polarimetry over 99.9% and transmittance over 42%.  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 polarizer include high temperature resistance,      wet heat resistance,  low temperature resistance and cold and heat shock resistance.  High temperature resistant is refers to the polaroid at constant baking,  the temperature under the working conditions of heat-resistant,  according to the level of the polaroid technology at present,  usually divided into general type: working temperature is 70 ℃ x 500 hr.  In durable type: working temperature is 80 ℃ x 500 hr;  High durable type:  operating temperature above 90 ℃ x 500 h this three levels,  Moisture and heat resistance technical index refers to the moisture and heat resistance performance of polarizer ,  under constant temperature and humidity.  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 technical indicators of the bonding characteristics of polarizer ,  mainly refer to the various characteristics of the polarizer pressure-sensitive adhesive,  including the stripping force between the pressure-sensitive adhesive ,  and the glass substrate,  the stripping force between the pressure-sensitive adhesive and the stripping film,  the stripping force between the polarizer protective film and the polaroid,  and the bonding durability of the pressure-sensitive adhesive.   The debonding force between pressure sensitive adhesive and glass substrate is also called adhesive strength,  which is the most important bonding characteristic index of LCD polarizer.   This technical index is usually measured by the Japanese,  electronic machinery industry association specification eiaj-ed-2521a standard,  expressed in g/25mm as a unit. Generally, the stripping force of LCD polarizing sheet pressure-sensitive ,  adhesive on glass substrate is above 500g/25mm, while the upper limit in actual use is generally below 1000g/25mm.  A practical example shows,  that when the debonding force of the adhesive on the glass substrate is below 500g/25mm, the phenomenon of automatic debonding and warp will occur,  after the polarizing plate is bonded on the surface of the glass screen.

The appearance performance technical indexes of polarizer mainly refer to the surface roughness,  and the number of appearance defects of polarizer products.  These technical indexes mainly affect the utilization rate of polarizer products in SMT.  The technical index in the polaroid industry usually has a relatively consistent technical regulations,  general products for each polaroid (500 x 1000 ㎜) 15 the following points less is not more than 150 microns.  Because the final appearance inspection of polarizer products adopts manual visual inspection,  there will be a certain discrete distribution of appearance defects in the mass production of polarizer products.  For this reason,  each polarizer manufacturer adopts a certain difference between internal control specification and delivery specification to ensure,  the delivery quality standard. It should be noted, however,  that the 150 m threshold is reasonably reliable as it is close to the minimum limit for human visual resolution,  especially in industrial mass production where inspectors may experience visual fatigue during long hours of operation.

The main factors affecting the performance index of LCD polarizer.

The main factors affecting the performance of polarizer are all related to the basic performance index of polarizer.

The main factors affecting the optical properties of polarizer include:  the choice of polarizer film materials,  the choice of dyeing materials,  the choice of polarizer film dyeing,  the choice of tensile process conditions and the limitation of equipment capacity.  These all involve the core technology of polarizer production,  so polarizer production enterprises are very careful about the selection of these materials and process conditions,  generally not easy to change.  Once polarizer products are approved by customers,  polarizer manufacturers will take strict production quality management measures to ensure the stability of optical properties of polarizer products.

The durability technical indexes of polarizer products actually include two durability indexes:  the durability of polarizer film and the durability of pressure-sensitive adhesive. The main factors affecting the durability of polarizing film include:  the choice of basic materials of polarizing film, the choice of dyeing materials,  the dyeing of polarizing film,  the process conditions of stretching and compounding,  etc.  Generally speaking, the greater the molecular weight of the polarizing film and the higher the tensile ratio, the better the durability of polarizing film, and vice versa.  At the same time, the better the chromaticity of the polarizing film in the production process, the stronger the anti-solution ability of the dye used,  the better the durability of the polarizing film. Therefore, the durability of the dye polarizing film is much better than that of the iodine dyeing polarizing film.  The main factors affecting the durability of pressure-sensitive adhesives include: the choice of adhesive formulation, the choice of adhesive solvent,  the choice of adhesive blending process conditions,  the choice of adhesive drying process conditions and the choice of adhesive storage conditions.  It should be noted that the durability of adhesive index is a comprehensive index,  its influence is various, and this is another core technology of polaroid production general polaroid production enterprises in the adhesive process conditions were determined,  after will not change easily and have a strict quality management process requirements,  otherwise easy to cause bad batch of the products.

The main factors that affect the appearance of polarizer are various. It mainly includes: environmental purification conditions for polarizer production, material selection for polarizer production,  equipment conditions for polarizer production,  technological process and formula for polarizer production,  packaging, storage and transportation conditions for polarizer production,  and storage environment and processing methods for polarizer used by customers.  In short, polaroid is a very “delicate” product,   must be carefully kept and used,   otherwise it is easy to cause surface pits, black spots and warping surface defects.

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