液晶,是一种在一定温度范围内呈现不同于气态、液态,又不同于固态的特殊状态的物质。它既具有晶体所特有的双折射性,又具有液体的流动性。液晶最使人感兴趣的是:同一种液晶材料,在不同温度下可以处于不同的相,产生变化多端的相变现象。液晶系统分子间的作用力非常微弱,它的结构 Liquid crystal, is a kind of material which shows a special state different from the gaseous state, the liquid state and the solid state within a certain temperature range. It not only has the unique birefringence of the crystal, but also has the fluidity of the liquid. LCD is the most interesting is: the same kind of liquid crystal material, at different temperatures can be in different phases, resulting in a variety of phase changes. Liquid crystal system is very weak force between molecules, its structure