In recent years, organic light-emitting diode (OLED) displays have gradually become the mainstream display technology due to their self-luminescence, fast response speed, lightness and thinness, and ease of flexible preparation. Flexible OLED and printed OLED are two key development directions of OLED display technology. Flexible OLED has been initially used in high-end mobile phones, but there are still many problems to be solved. Printed OLED has attracted the attention and development of many companies and scientific researchers due to its cost-saving features. Although the printed OLED technology is not yet mature, it is developing very rapidly and industrialization is just around the corner. Aiming at the technical problems of flexible OLED and printed OLED, this article reviews the research progress of flexible OLED and printed OLED, and looks forward to its future development trend.