Attribute Classification Of Polarizers
Jul 25, 2018
Polarizer properties
The properties of the square piece are roughly divided into six dimensions: size, type, smooth sand, thickness, angle, and special treatment.
size:
That is, the size of the polarizer, the value represents the length of the diagonal of the square piece. Generally, it is between 7.0 inches and 65.0 inches. Due to the different cutting methods, it is easy to appear a variety of length and width ratios. In order to simplify the general term, it is generally distinguished by this calculation method, which is similar to the LCD module display.
Types of:
That is, the popular classification of polarizers is generally divided into IPS, VA (commonly known as TV), EWV, TN, but the market is generally IPS, VA, EWV. IPS and EWV are all perspectives. To compare EWV films, the IPS film has a better viewing angle and is thinner than the EWV chip. The EWV film is highlighted by its super wide viewing angle. VA is a narrow viewing angle for TV, commonly known as TV.
Light sand:
That is, the material processing of the polarizer, the IPS and the TV sheet are generally classified into a light sheet, an oil sand (AG13), a coarse sand (AG25), and a fine sand (AG40). EWV is only divided into light film, coarse sand (AG25) and fine sand (AG40).
thickness:
That is, the thickness of the polarizer, IPS and TV sheets are generally 0.08 mm, 0.11 mm, 0.13 mm, 0.15 mm, 0.17 mm, and 0.19 mm. The EWV film is generally 0.22mm.
angle:
That is, the stretching angle of the horizontal screen of the polarizer, the IPS and the TV sheet are generally 0°, 90°, 45°, 135°, 7°, and 83°. EWV sheets are typically 45° and 135°.
Special treatment:
It is a specially processed polarizer of the type, such as a blue sheet, a scratch resistant sheet, and the like.
So let's talk about how to determine these properties of the polarizer.
Polarizer size discrimination:
The most traditional method, using the ruler diagonal, the traditional name of the polarizer is inch, 1 inch is 3.33 cm. Generally, the square piece will be labeled at the factory, and the label will identify the size of the polarizer, or the merchant will classify it and explain it.
Polarizer type discrimination:
First, feel the thickness on your hand. If you feel thicker than the average one, make sure you are an EWV. Except for the special film, only the EWV film is very thick, generally 0.21mm-0.22mm. Then take two identical pieces, stack them at 90°, and look at the light. If you don't transmit light, it is IPS. If it is light, it is VA/TV.
Another method is to use glass, but since the glass on the market is self-made, there are many kinds of specifications, so there is no unified statement, but the main thing is to look at the color. The IPS is attached to the glass and does not change color, while the VA/TV sheet is discolored on the glass. (The glass here is not the glass that we normally encounter, but the special glass that has been specially used for polarizers)
Polarized light sand discrimination:
First, let's talk about the label. Under normal circumstances, the word "TFT" on the label is a light sheet. There is a CF on the label, which is a sand sheet. If there is no useful information on the label, then it can only be distinguished by the naked eye, and one side of the protective film is torn open (the protective film is the tear-off side, the release film is the hard-to-tear side, because it is sticky), and the surface is smooth. For the light film. If the surface is not smooth, it is sand. The sand is divided into oil sand, coarse sand, medium sand and fine sand. It is related to density or haze. The surface of the oil sand can be seen as wavy. The coarse sand is easier to distinguish. When the protective film is peeled off, the part of the granule can be seen. The feel is very obvious when it feels rough, and the fine sand is more delicate. It looks like the inside is atomized, unlike light. The surface is translucent, but the uniform part has a fine matte texture, and the medium sand is between the fine sand and the coarse sand.
Polarizer thickness discrimination:
Directly measure with a precision scale or an electronic scale. Generally, the protective film and the release film of the polarizer are torn open and then peeled off to measure. If you choose not to tear the protective film and the release film, measure directly. In general, it is necessary to subtract the thickness of 0.09mm or 0.1mm, but this is not recommended because the film thickness of the polarizer is not well controlled and there may be slight errors.
Polarizer angle discrimination:
The angle of the polarizer, that is, the direction of stretching, is determined by three methods:
Opposing or tearing the polarizer along a certain angle, it is easier to tear along the angle of the polarizer;
Look at the words or dots above the polarizer, and their arrangement direction is the direction of the polarizer.
A polarizer of a known angle is overlapped with the polarizer to be tested. If the degree of light transmission of the two overlaps is almost the same as the degree of light transmission of one sheet, then the two angles are the same, and vice versa.
(Note that in the polarizer industry, the medium and large size is generally based on the horizontal screen. In the case of not speaking the vertical screen angle, it is the horizontal screen angle. The small size needs to be confirmed in advance as a vertical screen. Horizontal screen.)
