Performance evaluation for introducing statistical process control to the liquid crystal display industry

Statistical process control (SPC) is a powerful technique for monitoring, managing, analyzing and improving process performance by statistical methods. Unfortunately, LCD industry cannot control key factors in the application process, and do not invest adequately in resources. Therefore, the performance matrix is adopted to locate those objective items outside the appropriate performance zones (APZ). Fuzzy measures are then applied to locate relations and weighted values for all objective items outside the APZ. Finally, objective items outside the APZ are transformed to overall performance values when implementing the SPC system using the Choquet integral method. A larger performance value for a strategy in the implemented SPC system indicates an improvement in priority. Hence, this study presents a complete assessment model to help manufacturers identify objectives and strategies for improving the process of introducing SPC.