Liquid crystals (Liquid Crystal,LC), is one of the phases, because of special physico-chemical and electrical properties, began to be widely used in the mid-20th century light-display technology.
Familiar States of matter (also known as phase) for gas, liquid, solid, relatively unfamiliar are plasma and LCD. Liquid crystal phase with specially shaped molecules will only produce, they can flow, and the optical properties of crystals. LCD definition now included with relaxation in a certain temperature range can be liquid crystal phase at low temperature for normal crystalline substances. And the composition of the liquid crystal material is an organic compound, which is made of carbon compounds constituted by the Centre. While LCD has two substances is based on combinations of Intermolecular forces and their optical properties and sensitive to electromagnetic fields, great practical value.