Holographic three-dimensional display method and device based on spatial light modulator

Abstract

The invention discloses a holographic three-dimensional display method and a holographic three-dimensional display device based on a spatial light modulator; the display device is composed of a laser light source, a polarization modulation component, a beam splitter prism, a spatial light modulator, a computer, a lens, and a pixel-type nano grating based directional diffraction screen; and the display method comprises the following steps: obtaining a multi-view two-dimensional image of a target object and undergoing preprocessing conversion process to generate a group of image arrays used for phase type hologram calculation; calculating corresponding phase type holograms with an iterative Fourier transform algorithm, loading the holograms to the spatial light modulator, and irradiating the holograms with the laser light source to obtain holographic reproductive images; and designing and manufacturing the pixel-type nano grating based directional diffraction screen, and directionally diffracting corresponding reproductive image pixels to fixed positions to form different viewpoints. The method and the device disclosed by the invention, by combing with fast refreshing and loading of the spatial light modulator for the holograms, realize multi-view full-parallax dynamic holographic three-dimensional reproduction of the target object, and provide a feasible scheme for application of a naked-eye three-dimensional display technology.

Description

technical field [0001] The invention relates to a three-dimensional display method, in particular to a spatial light modulator-based holographic three-dimensional display method and device, and belongs to the field of computational holography and three-dimensional display. Background technique [0002] Three-dimensional display is an important goal of the development of modern display technology. Glasses-free three-dimensional display technology can obtain three-dimensional display effects without wearing any vision aids, and it is more in line with people's observation needs. It is the future development direction of three-dimensional display technology. In recent years, naked-eye 3D display technology has become more and more popular among researchers. At present, more mature naked-eye 3D display technologies include parallax barrier technology and cylindrical lens array technology. From the effect point of view, whether it is analyzed in terms of viewing angle, brightness...

AI Technical Summary

Problems solved by technology

However, in order to achieve true color display, the article uses a hexagonal structure light guide plate to realize the directional export of red, green and blue light. However, this hexagonal light guide plate does not match the existing flat panel display methods.

Moreover, the preparation of nano-gratings by electron beam exposure has low preparation efficiency and high cost, which also limits its application in display.

[0009] In China, research on dynamic holographic 3D display is still in its infancy, and there are no mature prototypes and engineering applications

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