US Patent 8981638 Display device including a partition having a stacked structure

To improve image quality of a full-color organic EL display panel. A partition has a stacked structure formed using different materials. A lower partition has a curved shape, and an upper partition has a flat top surface. An angle formed between a plane surface connecting a lower end of a side surface with an upper end of the side surface of the upper partition and the top surface of the upper partition is less than or equal to 90°. The height of the partition is controlled to be greater than or equal to 0.5 μm and less than or equal to 1.3 μm. With such a structure, a large color organic EL display panel achieves high-definition display.