DirectionalIllusion: Displaying Different Images Based on Gaze Movement Directions using a High-Speed Projector

Projectors and large displays are effective for presenting information to large, unspecified audiences without additional devices such as head-mounted displays. However, they are unable to deliver content to individual viewers. The ability to display varied visual content based on individual user states facilitates rapid and appropriate access to necessary information. We propose DirectionalIllusion, a novel image display technique that uses high-speed projection to present different images depending on the user's gaze movement direction. Our method projects stripe-based frames at high refresh rates; when a user moves their gaze in a specific direction, hidden visual content becomes perceptible due to temporal interference patterns. By changing the direction of gaze, users can selectively reveal different images embedded within the same visual field, enabling direction-dependent information access. Our results demonstrated that directional gaze shifts reliably trigger the intended image perception. We also propose application scenarios for both intentional and unintentional gaze movements, demonstrating how each can be utilized in different interaction contexts.