LCD display, is a kind of planar display. A screen display for televisions and computers. The display has the advantages of low power consumption, small size, low radiation. The liquid crystal display is used in two polarizing materials, so that the liquid will rearrange the crystals to achieve the imaging purpose.
Liquid crystal display (LCD) is a type of display for digital clocks and many portable computers. The LCD display uses two polarizing materials, between which are liquid crystal solutions. When the current passes through the liquid, the crystals are rearranged so that the light cannot penetrate them. As a result, each crystal is like a shutter, allowing light to pass through and block the light. Liquid crystal display (LCD) At present, science and technology information products are facing light, thin, short, small target development, in the computer peripheral has a long history of the display products are certainly no exception. Under the convenience of carrying and handling, the traditional display methods such as CRT image tube display and LED display board are all subject to such factors as large volume or huge power consumption, which can not reach the actual demand of users. The development of liquid crystal display technology is suitable for the current information products, whether it is right angle display, low power consumption, small size, or 0 radiation and other advantages, can allow users to enjoy the best visual environment. At present, most of the liquid crystal display technology with TN, STN, TFT three kinds of technology as the spindle, so we from these three techniques to explore their operational principles. TN-type Liquid crystal display technology can be said to be the most basic liquid crystal display, and then other kinds of liquid crystal display can be said to be based on the TN type as the origin to be improved. Similarly, it works more easily than other techniques, please refer to the image below. The diagram shows a simple structure of the TN-type liquid crystal display, including a vertical and horizontal offset plate, a fine-grained groove of the matching film, liquid crystal materials and conductive glass substrates. Its imaging principle is to put the liquid crystal material in two pieces attached to the optical axis perpendicular to the transparent conductive glass, liquid crystal molecules will be arranged in accordance with the thin groove direction of the film, if the electric field is not formed, the light will smoothly from the polarizer injection, according to the liquid crystal molecules to rotate their direction, and then from the other side of the shooting. If two pieces of conductive glass after power, the two pieces of glass will cause an electric field, and then affect the alignment of the liquid crystal molecules, so that its molecular bar to reverse, the light can not penetrate, and then cover the light source. In this way, the phenomenon of light and dark contrast is called torsion-field effect, referred to as TNFE. The liquid crystal display used in electronic products is almost always made by the principle of torsion to column field effect.
The display principle of STN is similar, and the difference is that the liquid crystal molecule with a TN torsion nematic field effect rotates the incident light by 90 degrees, and the STN super torsion type nematic field effect is to rotate the incident light 180~270度. To illustrate here, the pure TN liquid crystal display itself is only light and shade two situations (or black and white), and there is no way to change the color. The STN liquid crystal display is involved in the relationship between liquid crystal materials, as well as the interference of light, so the colors shown are mainly light green and orange color. However, if a color filter is added to the traditional monochrome STN liquid crystal display (color filter), and the monochrome display matrix of any pixel (pixel) into three of Sub-pixel (Sub-pixel), respectively, through the color filter to show red, green, blue three primary colors, and then through the three primary colors of the proportion of the harmony, can also show the color of Full-color mode. In addition, the larger the screen size of the TN-type LCD display, the contrast of the screen will appear poor, but with the improved technology of STN, it can make up for the lack of contrast.
TFT-type liquid crystal display is more complex, the main components include, fluorescent tube, light guide plate, polarizer, filter plate, glass substrate, matching film, liquid crystal material, thin mode transistor and so on. First, the liquid crystal display must first use back light source, that is, fluorescent lamp tube Project light source, these lights will pass through a polarizer and then through the liquid crystal, then the liquid crystal molecules arranged in order to change the way through the liquid crystal light angle. The light then has to go through the front of the colored filter and another polarizer. So as long as we change the voltage value of the liquid crystal, we can control the intensity and color of the final light and then change the color combination of different shades on the LCD panel.
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