LCD is a range between the solid and liquid substances, having a regular arrangement of organic molecules. It will show a transparent heating liquid state, but as it cools the turbidity appears at a solid-state in a form of crystalline particles with liquid and transistor characteristics, so-called “liquid crystal.” The principle of the liquid crystal display, to simply put it, is placed between two crystal energized electrodes solution. The order of the liquid crystal molecules when the electrode is energized will change, thereby changing the optical path of the transmitted light, to achieve the film like control.
LCD can be classified into three kinds: Passive matrix TN-LCD (Twisted Nematic-LCD, twisted nematic LCD), STN-LCD (Super TN-LCD, super twisted nematic LCD) and DSTN-LCD (Double layer STN-LCD, double super twisted nematic LCD). TN, STN, DSTN-LCD panel is basically the same; the difference is in each slight twist angle of the liquid crystal molecules. DSTN (commonly known as “pseudo-color”) was used in the early notebook computer monitors and handheld consoles. Due to its need to borrow external light source imaging, the Passive matrix LCD’s viewing angle is small, the reaction is slow, the picture quality is not a higher factor that makes this display not conducive to the development of desktop monitors. However, due to cost, the market is still using a small number of passive matrix display LCD. The passive matrix LCD, as it can be, was made thinner and lighter and more powerful.