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3D Polarizer Film

3D Polarizer Film

  • What is polarizer?


    A polarizer plate is a filter sheet which allows a specific polarization of light waves to pass through and blocks other polarizations.

    Two common types of polarizer sheets are linear polarizer and circular polarizer.

    Polarizers are widely used in research labs, optical industry and equipment at homes.
    Commercially available polarizers are made by different materials such as glass, crystals or plastics.

    Plastic polarizers are the least expensive and commonly used in LCD (liquid crystal display) such as screens of calculators or computer monitors, sunglasses, and 3D movie glasses.

    Structure of polarizer


    Basically, the polarizer plate is structured in 3 layers, polarizer film PVA (Polyvinyl alcohol) and support layers TAC (Tri-acetate cellulose) on both sides of polarizer. It is the most commonly used in linear polarizer, including protective film, PVA pressure glue (PSA), release film structure.

    Protective film used to protect the polarizing plate surface, consumers need to tear the film when use a polarizer.

    Onto this bare polarizer, additional treatments are applied such as an adhesive glue, hard coating, antiglare, anti-reflection and other surface treatments.

    Manufacture of polarizers


    Nowadays the polarizer film was invented by Polaroid company Edwin H. Land in 1938. Although it has 80 years of history, but the process principle and material is still roughly the same.
    The general process, the first is to produce polarized film, hydrophilic PVA (Polyvinyl alcohol).

    After the film is swollen, it is immersed in a dichroic dye solution and stained.
    The dichroic dye is usually a solution of iodine and potassium iodide. And then extend the dyeing film, extending to give the dichroic dye arrangement order, the higher the order, the prepared polarizing film optical properties better.

    After the extension of the film after drying, easy to stretch the direction of brittle fracture.
    Its raw materials for the hydrophilic polymer film, vulnerable to the impact of water vapor properties and therefore need to support and block the water vapor of the protective film.

    Type of Polarizer:


    At present there are two type of polarizers in the market: Iodine polarizing film and Dye Type Polarizing Film

    Iodine polarizing film has a high permeability, high contrast and a wide range of wavelength bias characteristics, the price is relatively cheap, so for a wide range of applications. The polarizing property of the dye-based polarizing film is inferior to that of the iodine system, but the wet heat resistance characteristic is good and belongs to the durability polarizing film.

    Application of Polarizer


    Iodine standard linear polarizing film applications is in a wide range, such as watches, calculator computers, PC, OA machines, LCD. In addition, cars, ships, aircraft, outdoor measurement equipment on the use of dye-based polarizing film such a durable polarizing film.

    We have developed several types of polarizer films for various purpose. Our customers have the highest confidence in our polarizer film products.
    3Dlens.com supplies the highest quality polarizer film at the lowest price.
    Where to buy Polarizer Film?

    Background


    Visible light is an electromagnetic wave. All electromagnetic waves are transverse waves. When it travels through space, its electric field (E) and magnetic field (B) are perpendicular to each other as shown in Figure 1.
    electromagnetic wave traveling
    Fig. 1. A traveling electromagnetic wave with the electric field (E) and magnetic field (B) perpendicular to each other.

    Electromagnetic waves may be unpolarized, partially polarized or completely polarized depending on the electric field vectors associated with the traveling waves as shown in Figure 2.

    Polarized Light vs Unpolarized Light
    Fig. 2 completely polarized light vs. unpolarized light

    For example, visible light given by an incandescent light bulb unpolarized.
    When an unpolarized light travels, the electric field vectors are in all directions on a plane which is perpendicular to the direction of the wave travels. The electric field vectors symbolize the random directions of polarization of the individual waves that comprise the light.

    Linearly polarized light can be produced from unpolarized light with the aid of certain material called polarizer. Commonly used polarizing sheet or film consists of certain long molecules embedded in plastic.

    When the sheet is manufactured, it is stretched to align the molecules in parallel rows. When light is sent through the sheet, electric field components along one direction pass through the sheet, while components perpendicular to the direction are absorbed by the molecules and disappear as shown in Figure 3. In this case, the light is linearly polarized.
    polarized light can be produced from an unpolarized light
    Fig. 3. Polarized light can be produced from an unpolarized light.

    If the electric field vectors are not completely random nor are perfectly aligned in one direction, it is called a partially polarized light.
    Polarization can be achieved through other processes such as reflection, refraction and scattering.

    Polarization by reflection


    When unpolarized light is incident on a nonmetallic surface, the reflected ray is partially polarized. The extent of polarization depends upon the angle of incidence and the material that the surface is made of. Metallic surfaces reflect light with a variety of vibrational directions; such reflected light is unpolarized. However, nonmetallic surfaces such as asphalt roadways, snowfields and water reflect light such that there is a large concentration of vibrations in a plane parallel to the reflecting surface.

    This reflected ray is called s-polarized, the electric field polarized perpendicular to the plane of the incident ray and the surface normal. A person viewing objects by means of light reflected off of nonmetallic surfaces will often perceive a glare if the extent of polarization is large.

    Sunglasses with the proper polarization axis allows for blocking this polarization and reducing the glare. Figure 4 shows the partially reflected ray from a non-metallic surface.
    partially s-polarized light reflected from a non-metallic surface
    Fig. 4 partially s-polarized light reflected from a non-metallic surface

    Polarization by Refraction

    Polarization can also occur by the refraction of light. Refraction occurs when a beam of light passes from one material into another material. At the surface of the two materials, the path of the beam changes its direction.
    The refracted beam acquires some degree of polarization. This partially polarized refraction is called p-polarized, electric field polarized in the same plane as the incident ray and the surface normal.
    Figure 5 indicates the partially s polarized ray due to reflection and p polarized ray due to refraction.
    Refracted ray and reflected ray are partially polarized
    Fig. 5 Refracted ray and reflected ray are partially polarized

    Brewster angle

    There is one special angle of incidence at which the reflected light is completely polarized parallel to the surface, the refracted ray being only partially polarized. This angle is called the Brewster angle. Unpolarized light can be separated into fully s-polarized and p-polarized light by stacking many plates at Brewster's angle with respect to the incident beam as shown in Figure 6.