A method for alignment of a homeotropic liquid crystal cell by doping a percentage of a positive Δε (dielectric anisotropy), neutral (Δε approximately 0), or negative Δε liquid crystal material, a high contrast ratio homeotropic alignment of difluoro compounds or mixtures is achieved, independent of operating temperature. Without special requirement on alignment layers, rubbing methods or pretilt angles, the uniform aligned homeotropic liquid crystal cell results even at high temperature and the physical properties, such as the birefringence and viscosity, of the liquid crystal mixtures are improved. In an embodiment the method the homeotropic vertically aligned nematic liquid crystal cells are used in the production of high contrast microdisplays.
通过掺入一定比例的正Δε(介电各向异性)、中性(Δε约为 0)或负Δε液晶材料,实现各向同性液晶单元的配向,从而实现二
氟化合物或混合物的高对比度各向同性配向,且不受工作温度的影响。无需对配向层、摩擦方法或预倾角度有特殊要求,即使在高温条件下也能获得均匀配向的各向同性液晶单元,并改善液晶混合物的物理性质,如双折射和粘度。在该方法的一个实施方案中,各向同性垂直排列向列液晶电池可用于生产高对比度微显示器。