In the holographic display system, it is easy to control focal length and image correction. If it needs to present dynamic multi-focal contents, it is hard to realize real-time calculation processing with the large amount of information. In order to solve the above problems, we developed 3D modified Gerchberg–Saxton algorithm (3D MGSA) to reduce the number of iterations by inputting random phase. Then, we designed the adjustable optical system to realize the dynamic focus. Through the combination of them, the AR holographic projection display system of rapid focusing alignment is achieved, thereby maintaining good image quality at any focal length.

We proposed a portable projection system that can be used for 2D and 3D holographic reconstruction. Through the use of adjustable optical system to achieve rapid focusing alignment and image magnification.

Holographic display is a kind of naked-eye stereoscopic display, and we can watch stereoscopic images without wearing any device. It can provide continuous parallax and solve vergence accommodation confliction (VAC) problems. The adjustable focus projection system proposed by our team can be combined with AR and VR. This system can quickly switch images of different depths, providing the best stereoscopic image quality between virtual objects and human eyes, allowing users to have an immersive viewing experience.