With the increasing competition, the improvement of service quality has become the critical factor to success for firms. Management has attempted to find ways to help service employees make use of their own emotional intelligence when facing a variety of customers so as to display positive emotions toward internal customers and then improve internal customer satisfaction. The purposes of the study are to examine the influences of emotional intelligence on emotional displays and internal customer satisfaction as well as the mediating role of emotional displays between emotional intelligence and internal customer satisfaction. We collected data from 42 service employees in banks and their 498 customers, and then conducted subsequent analyses. The results of hierarchical regression analysis showed that emotional intelligence had positive effects on emotional displays and internal customer satisfaction. Emotional displays also had a positive effect on internal customer satisfaction. In addition, the relationship between emotional intelligence and internal customer satisfaction was mediated by emotional displays. We discuss implications of these findings, limitations, and directions for future research.