3D head-up display with a multiple extended depth of field based on integral imaging and holographic optical elements

We propose a 3D head-up display with a multiple extended depth of field based on integral imaging and holographic optical elements (HOEs). The system consists of two components, an integral imaging module for generating 3D target objects and a holographic combiner for off-axis diffraction and image magnification. By recording HOEs with different optical powers at different locations on the same recording material, 3D imaging at multiple depth ranges is achieved. The designed and built HUD prototype verifies the feasibility of the method. The center depth planes of the red and green 3D images are at 600 mm and 2200 mm. The theoretical depth magnifications of the red and green channels are 1.5 and 5.5, and the measured depth ranges are approximately 250 mm and 850 mm. In addition, the influencing factors and improvement methods of resolution in LED illumination or laser illumination are analyzed.