The most important part of the production process is to apply the organic layer to the base layer. One of its methods is: vacuum deposition or vacuum thermal evaporation. The key to the OLED process is: evaporation technology. Due to the need for process mixing and in order to avoid cross contamination, different functional layers need to be vapor-deposited in different evaporator cavities, and at the same time, the substrate is transferred between different cavities by a robot after the evaporation is completed.