Fundamental study of thin film formation utilizing inkjet printing and its application to electronic devices are described. As an application development of an organic electroluminescence (EL) display is demonstrated, where the control of the surface free energy is very effective. Properties of inkjet droplets and the diversity of the films prepared by the inkjet printing are shown. Fundamentally, the evaporation process can be divided into the interface kinetics and the diffusion process. The unique behavior of inkjet droplets is discussed based on the relationship between the droplet size and the evaporation time.