The Principle Of Rubbing Orientation Of LCD Screen?

Rub the flannel on the alignment film in one direction to form the alignment layer of the LCD liquid crystal screen. The liquid crystal molecules at the alignment layer will be arranged in parallel according to the rubbing direction, so that a consistent alignment can be obtained. The alignment direction of the liquid crystal molecules at the upper and lower plates is 90 degrees to each other, which is the central link in the manufacture of twisted nematic (TN) liquid crystal cells. There is still controversy about the principle of rubbing orientation, but one thing is certain, that is, when the liquid crystal molecules are aligned along the rubbing direction, the energy of the system is the lowest, or the liquid crystal molecules at the alignment layer tend to be aligned along the direction with minimal energy. This energy is called anchoring energy. As for the microscopic mechanism of the arrangement direction given by friction, it can be mainly considered from the following two aspects: One is to "plan out" very dense grooves of different depths and widths through friction. The two ends of this groove are different. If you take the process of shaving as an analogy, one end of the groove is wide and deep, and the other end is narrow and shallow. Such grooves, especially grooves (nano-scale) equivalent to the size of liquid crystal molecules, will inevitably have an effect on the orientation of liquid crystal molecules. Another consideration is the influence of the alignment direction of the organic polymer of the alignment layer material on the alignment of the liquid crystal molecules.