Wedge prism array design for a glasses-free multiview holographic combiner

Conventional methods for glasses-free 3D displays, such as parallax barriers, often suffer from reduced image resolution and limited viewing zones. To address these issues, this study proposes a holographic screen system utilizing a volume holographic optical element (VHOE) combined with a wedge prism array. A primary challenge in holographic screens is accurately aligning diffracted light rays with the observer’s eyes to achieve consistent stereopsis. To investigate the feasibility of a multi-view 3D display, a wedge prism array was designed and fabricated using an LCD 3D printer with high-clear resin. Optical evaluations confirmed that the fabricated prisms could precisely control the deflection angles of parallax images. This study confirms that 3D-printed wedge prism arrays can effectively control light rays for multi-view 3D displays, providing a foundation for expanded viewing ranges without sacrificing resolution.