Large-size holographic display method based on effective utilization of two spatial light modulators

In this paper, a large-size holographic display method based on the effective utilization of two spatial light modulators (SLMs) is proposed. Firstly, the information of the object is divided into two equal parts and extracted into two information groups. At the same time, the effective viewing area (EVA) of the two information groups are calculated respectively in order to analyze the viewing angle of the reconstructed image. Then, the computer-generated holograms (CGHs) of the two information groups are generated with shifting and adding operation of the principal fringe patterns. By loading the blazed grating on the CGHs, the position of the reconstructed image can be adjusted so that the seamless stitching of the reconstructed image can be achieved. Finally, large-size reconstructed image can be displayed on the receiving screen by using the spatial multiplexing method of the two SLMs. Moreover, the calculation speed of the hologram is improved. The experimental results verify the feasibility of the proposed method.