TeamS is a startup that develops SSE, embedded software that bidirectionally links smartphones with external displays. Android accounts for about 70% of the smartphones market share. It is expected that the full adoption of 5G after 2022 and the spread of flexible sheet displays will create more demand for SSE. An SSE embedded device would only need minimum components such as image/audio processing, touch panel, communication, and battery. Two types of mass-production models, sheet OLED and glass OLED, are under development through collaboration. TeamS keeps expanding the range of applications, such as virtual displays on the cloud, as they create the frontiers of the 5G era technologies.