Abstract
This paper describes the mechanism of pretilt angle generation. The pretilt angle is generally supposed to depend on the cubic molecular structure and the polarity of the alignment layer surface. However, we often fail to get the original pretilt angle in the case of practical panel fabrication. This shows there is some cause reducing pretilt angle. We find the uneven surface condition of the alignment layer influences the pretilt angle, and examine the relationship of the roughness of alignment layer surface and the pretilt angle. We conclude the pretilt angle depends on two elements. The first element is the cubic molecular structure and the polarity of the alignment layer surface, and the other element is flatness of alignment layer surface.
