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

Abstract

The invention discloses a holographic three-dimensional display method and device based on a spatial light modulator. The display device consists of a laser light source, a polarization modulation device, a beam splitting prism, a spatial light modulator, a computer, a lens, and a directional diffraction screen based on a pixel-type nano-grating constitute. Obtain the multi-view two-dimensional image of the target object, and generate a set of image arrays for phase hologram calculation after the preprocessing transformation process. The iterative Fourier transform algorithm is used to calculate the corresponding phase hologram, and the hologram is loaded into the spatial light modulator, and the hologram is illuminated by a laser light source to obtain a holographic reconstruction image. Design and manufacture a directional diffraction screen based on a pixel-type nano-grating, and directional diffract the corresponding reproduced image pixels to a fixed position to form different viewpoints. Combined with the fast refreshing and loading of the hologram by the spatial light modulator, the multi-view full parallax dynamic holographic three-dimensional reproduction of the target object is realized, which provides a practical solution for the application of 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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