Liquid crystals are very special substances. It's a very special substance. It flows like a liquid and has some of the optical properties of a crystal. Liquid crystal was discovered by the Austrian botanist Reinitzer in 1888. It is an organic compound between a solid and a liquid with regular molecular arrangement. The arrangement of liquid crystal molecules has a certain order, and this order is very sensitive to the changes of external conditions, such as temperature and electromagnetic field. Under the action of electric field, the arrangement of liquid crystal molecules will change, which will affect its optical properties. This phenomenon is called electro-optical effect.
LED display is usually mounted on the two pieces of glass substrate with the membrane, LCD will match to along the groove, because the glass to match to the groove from 900 liquid crystal molecules on the same plane as the blinds a a lined up, and the molecular nematic from one level to another level transition will gradually turn 900, that is to say, the arrangement of two layers of molecular phase difference of 900. Generally the most commonly used led LCD type for nematic nematic liquid crystal, molecular shape for long bar, width is about 1 to 10 nm (1 nm = 10 am), under the effect of different current electric field, the liquid crystal molecules will do arrange rules rotated 90 degrees, producing the difference of light transmittance, so under the action of the power supply and off to produce the difference between light and shade, each pixel to the principle of control, can form the image.