Large-angle holographic display system based on effective area expansion of spatial light modulator

Abstract

The invention provides a large-angle holographic display system based on effective area expansion of a spatial light modulator. The system includes a laser device, a filter, a solid lens, a beam splitter, an SLM 1, an SLM 2 and a diaphragm, wherein the laser device, the filter and the solid lens are utilized to create uniform parallel beams, the beam splitter is located in the exit direction of the parallel beams and is used for splitting the beams into two beams that are perpendicular to each other, the two SLMs are in the same model and placed perpendicular to each other, the resolution of the SLM is M, when the parallel light illuminates the two SLMs separately, the zero-order light can be seamlessly spliced together through the beam splitter, the diaphragm is utilized to eliminate high-order diffracted light in a reconstructed object, in order to extend the effective area of the SLM, the two SLMs and the beam splitter are equivalently regarded as a 2M SLM which is recorded as the 2M SLM, when a hologram of an object is loaded on the 2M SLM, the reconstructed object with a large viewing angle can be viewed.

Description

[0001] 1. Technical field [0002] The present invention relates to holographic display technology, and more specifically, the present invention relates to a large viewing angle holographic display system based on the expansion of the effective area of ​​a spatial light modulator. [0003] 2. Background technology [0004] For a long time, holographic display is considered to be the most ideal three-dimensional display method. However, limited by the parameters of the spatial light modulator (SLM), the viewing angle and size of the reconstructed object are relatively small. Since the emergence of holographic technology, researchers have proposed various methods and systems to solve this problem. For example, some researchers use shutters or galvano mirrors to expand the viewing angle of the reconstructed object through the principle of time division multiplexing. Although the method based on time division multiplexing can solve the problem of small viewing angles, it is diffi...

AI Technical Summary

Problems solved by technology

The traditional space-division multiplexing system uses multiple SLMs arranged in parallel. However, due to the gap between the SLMs, the light energy utilization rate of the system is low, and the viewing area of ​​the reconstructed object is discontinuous. Subsequently, some researchers A holographic display system in which multiple SLMs are curved and arranged together is proposed. Although this system achieves a holographic display effect with a large viewing angle, the reconstruction of the optical path is complicated and the system is difficult to operate.

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