Abstract
The goal of this project is to develop an autostereoscopic tabletop display for multiple viewers freely positioned around the display. 3D content is produced by an omnidirectional dynamic parallax barrier display using dual layer transparent LCD panels. Time multiplexing the parallax barrier’s period and orientation, and the use of a directional backlight allows for displaying 3D content 360° around the table to multiple tracked viewers. The novel directional backlight provides precise addressability of a large number of views using a hemispherical mirror to collimate light from a concentric outwards facing hemispherical LED array. A prototype was built using two 27” 2560×1440 pixel resolution LCD displays with 144Hz refresh rates. Interactive content and dynamic parallax barriers are rendered in a Unity 3D game engine based upon viewer positions obtained from a Vicon tracking system and a Kalman filter. The addressable backlight consists of 216 LEDs, addressable in 36 rows 10° apart placed on a transparent 38cm (15”) wide hemisphere inside a 76cm (30”) hemispherical concave mirror.
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