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Can Compensate For The Lack Of Contrast
- Apr 25, 2018 -

At present, most of the liquid crystal display technologies use the TN, STN, and TFT technologies as their main axes. Therefore, we discuss their operating principles from these three technologies. The TN-type liquid crystal display technology can be said to be the most basic of liquid crystal displays, and other types of liquid crystal displays can be said to be improved with the TN-type as the origin. In the same way, its operation principle is also simpler than other technologies. Please refer to the picture below. The figure shows a simplified construction of a TN-type liquid crystal display, including a polarizing plate in a vertical direction and a horizontal direction, an alignment film having a fine groove, a liquid crystal material, and a conductive glass substrate. The imaging principle is that the liquid crystal material is placed between two transparent conductive glass attached to the optical axis vertical polarizer, and the liquid crystal molecules are arranged in order according to the fine groove direction of the alignment film. If the electric field is not formed, the light will be smooth. It is injected from the polarizer, rotates its direction of travel according to the liquid crystal molecules, and then exits from the other side. If two sheets of conductive glass are energized, an electric field will be created between the two sheets of glass, thereby affecting the alignment of the liquid crystal molecules, and the molecular rods will be twisted so that the light cannot penetrate and the light source is blocked. The phenomenon of light-dark contrast obtained in this way is called twisted nematic field effect, abbreviated as TNFE (twisted nematic field effect). The liquid crystal displays used in electronic products are almost always based on the principle of twisted nematic field effects.

production. The display principle of the STN type is similar, except that the liquid crystal molecules of the TN twisted nematic field effect rotate the incident light by 90 degrees, and the STN super twisted nematic field effect rotates the incident light by 180 to 270 degrees. To explain here is that the simple TN liquid crystal display itself has only two kinds of light and dark (or black and white), and there is no way to change the color. The STN liquid crystal display involves the relationship between the liquid crystal material and the interference of light, so the display colors are mainly light green and orange. However, if a color filter is added to a conventional monochrome STN liquid crystal display, and any pixel of the monochrome display matrix is divided into three sub-pixels, respectively, through the color filter The film displays the three primary colors of red, green, and blue, and the color of the full-color mode can also be displayed through the reconciliation of the proportions of the three primary colors. In addition, if the display screen of the TN-type liquid crystal display device is larger, the contrast of the screen will be poor, but the improved technology of the STN can make up for the lack of contrast.