Implementing Design Thinking in The Development of Digital Signage User Interface for Public Health Education

Covid-19 may spread through public facilities-such as digital signage. Gaze-based touchless technology allows digital signage to be accessed without touching the screen. Previous works, however, merely focused on seamless interaction without rigorous consideration of user interface development. Here we report an implementation of Design Thinking-a user-centered design method-in development of digital signage user interface. We conducted a survey of over 200 participants for categorizing important topics related with Covid-19. Next, we defined and developed personas and user interface. The interface was deployed in a touchless digital signage equipped with a Tobii ET5 eye tracker. Finally, we evaluated the proposed user interface design in a real-time experiment. We asked the participants to complete two tasks through different modes of button-fast (300 pixels/s) and slow (150 pixels/s) moving button. Our experimental results show that the participants achieved 96.88% of average Task Completion Rate for both fast- and slow-moving button. Our study implies that the user-centered design provides a reliable scientific method to develop a more user-friendly interface. Even in a novel technology such as touchless digital signage, appropriate user interface design may provide enjoyable interaction between users and the digital signage.