Common LCDs are divided into four types according to their physical structure:
(1) Twisted Nematic (TN-TwistedNematic);
(2) Super twisted nematic (STN-SuperTN);
(3) Double-layer super-twisted nematic (DSTN-DualScanTortuosityNomograph);
(4) Thin-film transistor type (TFT-ThinFilmTransistor).
1. The TN type uses the most basic display technology in the liquid crystal display, and then other types of liquid crystal displays are also improved based on the TN type. Moreover, its operating principle is also simpler than other technologies. Please refer to the picture below. The figure shows a simple structure diagram of a TN-type liquid crystal display, including a polarizing plate in the vertical and horizontal directions, an alignment film with fine grooves, a liquid crystal material and a conductive glass substrate.
2. The display principle of STN type is similar to TN. The difference is that TN twisted nematic field effect liquid crystal molecules rotate the incident light by 90 degrees, while STN super twisted nematic field effect rotates the incident light by 180-270 degrees.
3. DSTN scans the twisted nematic liquid crystal display by double scanning, so as to achieve the purpose of displaying. DSTN is developed from super twisted nematic display (STN). Because the DSTN adopts dual scanning technology, the display effect is greatly improved compared with STN.
4. The TFT type liquid crystal display is relatively complicated, mainly composed of: fluorescent tube, light guide plate, polarizing plate, filter plate, glass substrate, alignment film, liquid crystal material, thin mode transistor, etc. First of all, the liquid crystal display must first use a backlight, that is, a fluorescent tube to project the light source. These light sources will first pass through a polarizing plate and then through the liquid crystal. At this time, the arrangement of liquid crystal molecules will change the angle of light passing through the liquid crystal, and then these lights must also pass through the colored filter film in front and another polarizing plate. Therefore, as long as we change the voltage value applied to the liquid crystal, we can control the last light intensity and color, so that we can change the color combination with different tones on the LCD panel. It is the panel of the current mainstream liquid crystal display.
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