If you want to know what is the LCD, you’d better learn the informationn about liquid crystals. You may think the substance is a kind of liquid due to the name. Actually liquid crystals are neither solid nor liquid–they are a state of matter actually intermediate between the two. Liquid crystals can usually flow like a liquid, but their molecules are oriented in a somewhat-organized arrangement like the molecules or atoms in a crystal.
These liquid crystal materials were discovered and used heavily in the 1970s, and since then they’re become ever more popular in a variety of different electronic devices that we find all around us today.
Molecules in liquid crystals tend to adopt the same orientations so that they line up in rows along parallel axes which differs from liquids. The arrangement of the molecules is ordered and organized even though the molecules can continue to flow past each other. Most liquid crystals form from materials with long, rod-like molecules that have a partial positive charge on one end and a partial negative charge on the other.
As well, there are several different classes of liquid crystals. In nematic phase crystals, although the molecules are all lined up in the same way like long rows of cars, they are also staggered so that one row may be a little farther ahead or behind the next. In smetic phase crystals, the molecules form into layers or sheets that can slide past each other. Like smetic phase crystals, cholesteric phase crystals also have layers; the molecules in each layer are at a different angle from the molecules in other layers.
LCD and Its Uses
LCD(liquid crystal displays) are typically made using nematic phase crystals; the arrangement of the molecules only permits light with a certain polarization (light waves at a certain angle or tile) to get through. In the presence of an electric field, however, the molecules realign so that they block the polarized light, creating a dark spot or bar on the screen.
Liquid crystal(commonly prepared by 4-Fluorophenol, the molecular is C6H5FO) displays change color in the presence of electrical fields, and it’s this technology that’s part of what’s allowed televisions to get smaller and smaller over the years. The same is true of computer monitors, and especially true of laptop screens. While there have been other technological advances that have contributed to the minimizing of these machines, if not for the contribution of liquid crystals, chances are that our sleek entertainment technology would still be a lot bulkier.