In the orientation film velvet flashed in one direction, you can form LCD LCD alignment layer. The liquid crystal molecules at the alignment layer will be arranged in parallel in the rubbing direction so that a uniform orientation can be obtained. The upper and lower two liquid crystal molecules arranged at 90 degrees into each other, which is twisted nematic (TN) type liquid crystal cell manufacturing center.
Rubbing on the principle of so far still controversial, but one thing is certain, that is, when the lowest energy arrangement of the liquid crystal molecules in the rubbing direction of the system, or the liquid crystal molecules at the alignment layer tends to be arranged along the direction of minimum energy, This energy is called anchoring energy. As for the micro-mechanism of rubbing orientation, we can mainly consider from the following two aspects: First, by rubbing "shave" very dense depth, width and width of the groove.
The trenches are not the same at either end. If the process is analogized, then the trenches will be wider at one end and narrower at the other. Such trenches, and especially trenches (on the order of nanometers) comparable in size to liquid crystal molecules inevitably have an effect on the orientation of liquid crystal molecules. Another consideration is the orientation of the alignment layer material organic polymer orientation of the liquid crystal molecules.