Political polarization

1.When the upper and lower polarizing plates are perpendicular to each other, the light can appear bright without voltage applied.

Ordinary polarizer is gray, subdivided into medium  and blue ash. However, with the variety of LCD varieties, the corresponding demand for color polarizing film also appeared, the most commonly used purple, and the others are blue, yellow, red and other colors of the polaroid.

Polarization oflight

The AG layer can scatter the external light source, so we see that the surface of the polarized sign is foggy rather than reflective.

(1) storage conditions: temperature 20 + 15 degrees, humidity 65% + 20%RH, far away from heat shock.      (2) care should be taken in the handling of polarizer: no friction, bending, impact and damage to polarizer.      (3) every time the polarizer is not used, it should be placed in the aluminum packaging bag in time and sealed with adhesive tape for safekeeping.      (4) the surface of polarizer should be clean, not touching the surface with your hands.      (5) the products that have been cut well should be put into use in time and avoid damp.

(1) reflection type:       When the light is slanted onto the surface of the glass, the reflected light will be partially polarized. By using the continuous reflection effect of multilayer glass, the non polarizing light can be transformed into linear polarized light.(2) complex flexion type       Two pieces of calcite crystals are joined, and the incident light is decomposed into two polarized lights, called ordinary light and extraordinary light.(3) two chromatic microcrystalline       The tiny crystals with two colors are regularly adsorbed on transparent sheets. This is the first polarizing film method made by man.(4) two chromaticity of polymer     Using a good polarizing polymer film, the intramenoid molecules are directed and adsorbed with two chromaticity substances. The adsorbent type polarizers exist in the form of Plate or Sheet or Film, so it is usually called a polarizing (Polarizing Plate or Sheet) or a polarizing film (Polarizing Film). ). Another popular term in English is (Polarizing Filter).

The definition of zero edge: no matter what the LCD angle is, the number of points is zero at the corresponding edge of 6 o'clock.

In order to meet the requirements of LCD, surface processing of TAC layer is usually done when polarizer is produced to achieve some essential functions. The two most common surface treatments are anti reflection (AR) and anti glare (AG).

As the PVA molecules are aligned in a straight line, the iodine ions (or dye molecules) adsorbed on the PVA layer also follow the directional deflection to form a long chain of iodide ions (or dye molecules). Because iodide ions (or dye molecules) have good polarizability, it can absorb polarized light parallel to the direction of its arrangement and only pass the polarized light in the vertical direction, and the polarizing film can be made by this principle.

Circular polarization

The PVA molecule is randomly distributed at any angle. Under certain temperature and humidity conditions, the force is gradually deflected in the direction of force after tension, and tends to be a linear distribution.

(1) metal polarizing film     The metal salts such as gold, silver and iron are adsorbed on the polymer film and then reduced to make the rod like metal biased. At present, only some reflector can be applied.(2) iodized polarizing film     The iodine molecules are adsorbed on PVA and then extended to orientate them, so that they have polarized optical properties. It is one of the main types of polarizer market, and its manufacturing technology has been mature. The advantage is that the transmittance and degree of polarization are high, and the polarization degree of the theoretical value is close to 100% and the transmittance is 50%. The disadvantage is that the polarization performance of the iodine molecule is easily damaged in high temperature and high humidity, and the weatherability is poor.(3) polarizing film of dye system     Organic dyes with two colors were adsorbed onto PVA and then extended to orientate them, so that they had partial rotation properties. It is also one of the main types of polarizer market. The advantages are good weather resistance, often used on products with high reliability, but it is difficult to obtain high degree of polarization and transmittance, and the price is higher than that of iodine molecule polarizer.(4) polythene polarizing film     Using acid as catalyst, PVA is dehydrated, so that PVA molecules contain a certain amount of ethylene structure, and then extended to orientate, so that it has partial rotation properties. At present, the technology is not very mature and less applied.

The index of moisture and heat resistance refers to the stability of the appearance, optical and adhesion properties of the Polaroid in the constant temperature and humidity conditions. It is also usually divided into three technical grades.

Degree of polarization

The transmittance is T=Iout/Iin, in which Iout and Iin are the intensity of the light intensity through the polarizer and the intensity of the incident polarizer. In the ideal case, the light vibrate in the direction of vertical polarization axis is completely absorbed, equivalent to half of the light, that is, T=50%, usually the transmittance rate, the parallel transmittance and the direct transmittance.Transmission spectrum: LCD requires that the transmittance of the polarizer in the range of visible light is uniform, that is, the light transmittance curve should be straight, otherwise the emitted light will have color, which affects the display effect.

Elliptical polarization

In order to avoid excessive concentration of light, the surface of TAC layer of polarizing film is made concave and convex, and the light is dispersed evenly to achieve the effect of anti glare.

Visibility: high brightness -- high transmittanceHigh contrast - high polarization, surface anti glare, anti reflection and low reflection processing.Development of temperature compensation membraneWide viewing angle - wide diagonal and liquid crystalline polymer filmsFull color broadband wide compensation film, full visual range compensation, wide bandwidth and wide phase compensation.          Reliability: high durability -- high reliability of polarizing film, high reliability of adhesive, functional materials.High reliability          High durability index: 105 C X 1000HRS80 C X 90%Rh X 1000hours          Anti UV performance: cutoff capability for ultraviolet radiation          High efficiency: high efficiency of production - wide range, large coil length, unmanned operation and automatic detection.Application of high efficiency -- Application of large size, semi permeable, antistatic and protective films          Lightweight: thin materials, simple structure, application of liquid crystalline polymer membranes, composite functional materials.          Low cost: structural simplification, material substitution, and LR supplement to AR          Visibility: high brightness -- high transmittanceHigh contrast - high polarization, surface anti glare, anti reflection and low reflection processing.Development of temperature compensation membraneWide viewing angle - wide diagonal and liquid crystalline polymer filmsFull color broadband wide compensation film, full visual range compensation, wide bandwidth and wide phase compensation.          Reliability: high durability -- high reliability of polarizing film, high reliability of adhesive, functional materials.High reliability          High durability index: 105 C X 1000HRS80 C X 90%Rh X 1000hours          Anti UV performance: cutoff capability for ultraviolet radiation          High efficiency: high efficiency of production - wide range, large coil length, unmanned operation and automatic detection.Application of high efficiency -- Application of large size, semi permeable, antistatic and protective films          Lightweight: thin materials, simple structure, application of liquid crystalline polymer membranes, composite functional materials.          Low cost: structural simplification, material substitution, and LR supplement to AR

Was watching a nature documentary and it touched on some animals seeing polarized light vs ultraviolet light. What is polarized light, and how does it differ from UV light?

It refers to the bonding properties of the pressure sensitive adhesive in the polarizer. There are usually three criteria for describing the adhesion:

Light is an electromagnetic wave in which its waves and magnetic waves can not be separated from each other. The three of the three are the vertical relations between the electric field (E), the magnetic field (H) and the direction of the electromagnetic wave (K).Generally, the natural light is a light wave uniformly vibrating in the direction of 360 degrees, and is completely uniform in the direction of 360 degrees. We call it the non polarized light.

polarization中文

PVA:PVA membrane is a kind of polymer, which is dyed with two chromatic organic dyes. At the same time, it is extended under certain humidity and temperature conditions, so that it absorbs two color dyes to form polarization properties. After dehydration and drying, the original film of polarizer is formed.

1, LCD brightness: polarized light transmittance, polarizer thickness, polarizing film additional functional membrane.     2, LCD contrast: polarizer contrast, polarizer TAC additional functional membrane.     3, LCD perspective: polarizer TAC additional functional membrane, polarizer phase contrast film.     4. LCD chroma: the angle of the polarizer, the polarizer, the phase difference compensation film and the polarizer.         The selection of the angle of adhesion film and the wide angle functional film with compensation film     5. LCD thickness: thickness of polarizer and structure of compensation film.     6, LCD tone: polarizer shade, polarizer phase difference film, liquid crystal molecule compensation film.     7, LCD categories: permeable, semi permeable, reflective polarizer, phase difference compensation film.

When the light passes through the surface of the polarizer, it usually has a reflection loss of about 5%, thus affecting the contrast difference of LCD. The way to improve it is to apply an anti reflective material on the TAC layer of polarizing film, and reduce the reflection value by using the interference principle of light.

Polarization is also known as the polarization rate, which is defined as P= (I parallel -I vertical) / (I parallel +I vertical) x 100%, I parallel in the formula, and I perpendicular to the polarized light of the natural light, and the direction of the vibration is transmitted along the deflection axis of the polarizer and the vertical polarization axis. Ideally, I is perpendicular to =0, when P=1 has a polarization rate of 100%.Polarization is also known as the polarization rate, which is defined as P= (I parallel -I vertical) / (I parallel +I vertical) x 100%, I parallel in the formula, and I perpendicular to the polarized light of the natural light, and the direction of the vibration is transmitted along the deflection axis of the polarizer and the vertical polarization axis. Ideally, I is perpendicular to =0, when P=1 has a polarization rate of 100%.

As one of the three main materials of LCD, the performance of LCD has a great relationship with polarizer. Generally, the performance evaluation index of polarizer is divided into appearance, optical, adhesion, weather resistance, and other special properties.

Electric polarization

Circularly polarizedlight

At present, there are many types of polarizers on the market, but according to their polarizing materials, they are mainly classified into the following categories:

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The color coordinate value (NBS) corresponding to the color of the polarizer is usually expressed in terms of three parameter values.The value of a, B, L, as shown in the following figure

High temperature resistance refers to the appearance, optical properties and adhesion stability of the polarizer at a certain baking temperature. At present, it is divided into three grades according to the technical grade of the polarizer.

Refers to the total thickness of polarizer, including substrate thickness, adhesive thickness and TAC protective film thickness.

TAC:PVA film has a hydrophilic property. In the hot and humid environment, it will quickly deform, shrink, relax, decline, and have very low strength, brittle and breakable, not easy to use and process. Therefore, a layer of TAC film with high intensity, high transmittance and heat resistance is combined on both sides of the membrane.