Augmented reality 3D display system based on holographic optical element

Augmented reality (AR) technology is a hot topic research field in recent years. It combines the real world scene and virtual 2D or 3D images. We propose two AR 3D display systems based on integral imaging (II) by using a micro-lens array holographic optical elements (HOE). In the first AR display system, we realize a dual-view-zone 3D display based on angle multiplexing technology. In recording process, two parallel beams with different incident angles illuminate a micro lens array (MLA) to form two sets of inclined spherical wave arrays, and another parallel beam illuminates the opposite side of the photopolymer. After exposure, the MLA-HOE is fabricated. In reconstruction process, only the Bragg matched light can be diffracted, while the Bragg mismatch light transmits through the HOE directly. Thus, when a projector beam satisfies the Bragg match condition, two inclined spherical wave arrays with the different diffraction directions will be rebuilt to realize the dual-view-zone AR 3D display. In the second AR display system, we improve the resolution of the AR 3D display by using a lenticular lens array HOE. In this system, we use a divergent light as the reference beam to simplify the display system and enlarge the display size of the HOE. The AR 3D display system has enhanced resolution and is compact.