Retinal Homing Display: Head-Tracking Auto-stereoscopic Retinal Projection Display

This paper introduces Retinal Homing Display, which presents focus-free stereoscopic images via retinal projection, thus eliminating the need for the user to wear additional equipment. Traditional 3D displays, typically classified as either naked-eye stereoscopic or wearable, present inherent challenges: the former involves a compromise between resolution and accurate depth perception, while the latter imposes an additional burden on the user. Our proposed display employs optical and mechanical mechanisms to converge projector light at the user's pupil center, simultaneously tracking eye movements. This lets the user perceive focus-free, high-resolution stereoscopic images without wearable equipment. We implemented a proof-of-concept system utilizing a robotic arm and a Dihedral Corner Reflector Array (DCRA), subsequently evaluating image quality and its eyebox. Finally, we discuss the limitations of the current prototype and outline potential directions for future research.