There are four common types of LCD monitors:
1.TN-LCD (Twisted Nematic-LCD, Twisted Nematic LCD) 2. STN-LCD (Super TN-LCD, Super Twisted Nematic LCD)
3.DSTN-LCD (Double layer STN-LCD, double-layer super twisted nematic LCD) 4.TFT-LCD (Thin Film Transistor-LCD, thin film transistor LCD)
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Structurally, TN-LCD and STN-LCD seem to have little difference, but in essence they work differently: 1 the twist angle is 90° in the TN cell; the twist angle is 270° in the STN cell. Or nearby value;
2 In the TN liquid crystal cell, the polarizing axis of the polarizer is parallel to the long axis of the liquid crystal molecules on the surface of the upper substrate, and the polarizing axis of the analyzer is parallel to the long axis of the liquid crystal molecules on the surface of the lower substrate, that is, the upper and lower polarizing axes are 90° to each other; In the STN liquid crystal cell, the upper and lower polarizing axes and the long axes of the upper and lower substrate molecules are not parallel to each other, but are formed at an angle, generally 30°.
The 3TN liquid crystal cell works by using the optical rotation characteristics of the liquid crystal molecules, and the STN liquid crystal cell is separated into the normal beam and the abnormal beam by the polarized light of the polarizing light passing through the polarizer, and the incident light is decomposed into two types: a normal beam and an abnormal beam. The beam produces an optical path difference that interferes as it passes through the analyzer. Therefore, the STN liquid crystal cell works by utilizing the birefringence characteristics of the liquid crystal.
The 4TN liquid crystal cell works in black and white mode; the STN liquid crystal cell generally works in the case where the optical path difference is 0.8 μm, and the interference color is yellow. When a voltage greater than Vth is applied, white light can pass through the liquid crystal layer, but is significantly weakened when passing through the analyzer, and the liquid crystal cell has a black appearance, which is called a black/yellow mode. If the optical axis of the analyzer is left-handed by 30° with respect to the long-axis direction of the liquid crystal molecules on the outgoing light side, it is in the white/blue mode. That is, when no voltage is applied, the liquid crystal cell is blue; when a voltage is applied, the liquid crystal cell has a colorless appearance. Therefore STN is a colored mode.
TN is usually applied to electronic watches and calculators because it cannot display delicate characters. As the display TN series of liquid crystal displays have been basically eliminated, STN due to the large twist angle, the character display is more delicate than TN, but also supports basic color display, mostly used for LCD TVs, LCD monitors, handheld game consoles and so on. The subsequent DSTN and TFT were widely used as liquid crystal display devices. The DSTN liquid crystal display is mostly used in early notebook computers. It is also called pseudo color display because of the limited number of colors supported. TFT is used in both notebook computers and the mainstream desktop display market.
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