All-perspective three-dimensional holographic display system and method based on rotation modulating unit

Abstract

The invention relates to an all-perspective three-dimensional holographic display system and method based on a rotation modulating unit. The system comprises a modulating unit and a control unit, wherein the modulating unit comprises a space light modulator used for loading a Fourier computation holographic code, a Fourier transform lens used for performing Fourier transform on the output light information of the space light modulator and forming a Fourier holographic three-dimensional image and a reflecting mirror for imaging the mirror face of the Fourier holographic three-dimensional imageon a target image display area; the control unit is used for controlling optical beam incident time; the entire modulating unit rotates around a rotary shaft; and one or more modulating units are provided. According to the system and the method disclosed by the invention, elementary computing holographic three-dimensional images with certain viewing angles are connected in sequence, and 360-degree all-perspective three-dimensional image display is realized depending on the vision persistence of human eyes.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional image display, and relates to a full-view three-dimensional holographic display system based on a rotation modulation unit and a method thereof. Background technique [0002] Because two-dimensional display is difficult to clearly and accurately express the depth information of the third dimension, people have been working on the research of display technology that can display three-dimensional scenes - three-dimensional image display technology. At present, the main three-dimensional technology is the parallax three-dimensional image display technology, which provides two-dimensional plane images with different perspectives to the observer's binoculars, and synthesizes them by the human brain to obtain a three-dimensional display effect. Furthermore, combined with the scanning technology, it is possible to realize full viewing angle image display in the range of 360°. However, its prim...

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Problems solved by technology

[0004] However, limited by the spatial resolution of the modulator, the viewing angle of the 3D image directly generated by the optical modulator through the diffraction of the optical system is relatively small.

[0005] The patent "a full-view true three-dimensional display method and system" (application number 201010577360.X) realizes the synthesis of three-dimensional images of small viewing angle primitives through the scanning of high-speed mirrors, but there are two problems: 1. Using a single mirror , at most two modulation devices can be used at the same time to inject modulation information from the upper and lower sides of the mirror, so if you want to obtain a true three-dimensional image display with a larger viewing angle range (even 360°), the refresh frequency of the modulation device is required to be very high; 2 .When the internal mirror in the horizontal plane rotates and scans to different angular positions, the horizontal viewing angle range of each primitive 3D image changes with the different vertical viewing angles. When viewing angles are synthesized, there are image overlaps or gaps in different vertical viewing angles, which affect The final display effect

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