Glasses-free 3D LED display based on a radial barrier

Conventional glasses-free 3D displays have a limitation of an optimum viewing distance (OVD). This limitation is unfriendly for multi-user scenarios, with users at varying viewing distances. This article introduces a glasses-free 3D display method designed to support multi-user viewing from different distances. The method uses a radial barrier as the optical component, replacing a conventional parallel barrier or lenticular lens. This enables the angle between the optimum viewing plane (OVP) and the horizontal plane to be adjustable. To mitigate moiré patterns, a diffusion film is employed. The most important aspect of our current work is the development of a sub-pixel mapping algorithm for the radial barrier that considers the LED sub-pixel sharing. This paper describes the algorithm and the prototype hardware that is an updated version of a historical projection system developed in the mid-20th century.