Relationship between yield and cost considering repair and rework for liquid crystal display manufacturing system

The cost modeling of the LCD manufacturing system with the repair and the rework process is hard to achieve because of its complex manufacturing process. The technical cost modeling divides each process separately and hierarchically, so it is very useful to calculate the total manufacturing cost of the complex manufacturing system. We applied the method to the complex LCD manufacturing system to obtain more accurate cost model. Yields are the most important control parameters in manufacturing. In this paper, we propose a yield based cost model for the LCD manufacturing system and reveal the relationship between manufacturing yield and cost. Through the model, we can estimate the manufacturing cost on the basis of yields that are control indicators of manufacturing. Some simulations are performed to observe the effects of the yield to the cost, and the results coincide with the real situation. With the proposed model, we expect to develop some optimization problems for enlarging productivity in the LCD industry.