Analysis of the Character LCD Modules screen technology

LCD (Liquid Crystal) screen technology has experienced a very long process, from the most primitive to the black and white screen is now being popular color, every technological innovation, all startled a wild waves. Often chatted about the screen, there are always inseparable TFT, STN, OLED, TFT, false color, etc. The term is not often feel confused? Do not worry, in fact, not difficult to understand that knowledge. 20x2 oled
First talk about the principle of the LCD (although boring, but only the first understanding its structure and principle, to understand its technical and technological characteristics targeted in the purchase order, the application and maintenance to be more scientific and reasonable, patience and see) , 1888, Australian botanist Reinitzer (Reinitzer) of cholesterol's role in plants, the use of cholesteric benzene test, inadvertently discovered the LCD, which is an almost completely transparent material presented simultaneously Some characteristics of solids and liquids. Appears from the shape and appearance of the liquid crystal is a liquid crystal type but its molecular structure and exhibit a solid form. The same as the metal in a magnetic field, when subjected to the external electric field, it will produce an accurate molecular ordered; such as alignment of the molecules to be properly controlled, the liquid crystal molecules will allow light to penetrate; light path through the liquid crystal can be constituted to determine its molecular arrangement, which is a feature of the solid. LCD is an organic compound, by a long rod-like molecules. In the natural state, the long axis substantially parallel to the rod-like molecules.
LCD (Liquid Crystal Display, hereinafter referred to as LCD) first feature is the LCD must be poured into two columns with fine grooves between the plane to work properly. These two planes perpendicular to the groove (90 ° intersection), that is, if the molecule on a plane arranged in the north-south, the other thing to the molecular plane of arrangement, which is located between two planar molecules are Forced go into a 90-degree twist state. Since molecules are arranged along the direction of light propagation, so when the light through the liquid crystal is twisted 90 degrees. But when the LCD plus a voltage, the molecules will be re-arranged vertically, so that the light can be directed to go out without any reverse. The second characteristic of LCD is that it relies polarization filters and light itself, natural light in all directions is random divergence, polarization filter is actually a series of increasingly fine parallel lines. These lines form a network, blocking these lines are not parallel with all light polarization filters coincided with the first vertical line, they are able to completely block those already polarized light. Only two filters completely parallel lines, or light itself has been reversed with the second polarization filter to match the light was able to penetrate. LCD precisely by such two mutually perpendicular polarization filter constituted so in normal circumstances should block all attempts to penetrate the light. However, since the two twisted liquid crystal filled between filters, so the light piercing the first filter, the liquid crystal molecules are twisted by 90 degrees, and finally from the second filter in the shell. On the other hand, if it is to add a voltage of the liquid crystal molecules will rearrange and completely parallel, so that the light is no longer turn, so just by the second filter block. In short, the light blocking power, no power will make the light emitted. Of course, you can change the arrangement of the liquid crystal LCD, so that the light emitted at power, when power is not blocked. However, due to the LCD screen is almost always on, so only the "power to the light blocking" of the program in order to achieve the most energy purposes. QVGA lcd
LCD screen can be divided into black and white LCD screen and the LCD color screen, LCD monochrome screen called TN (Twisted Nematic) screen, mainly used in digital watches, calculators, handheld game consoles and other devices, in addition to the power LCD monochrome screen and manufacturing costs lower than LCD color screen, the other not, and color. And with color screen technology matures, black and white LCD screen will eventually quit the stage of history.