Two-dimensional holographic projection display method and system

Abstract

The present invention proposes a two-dimensional holographic projection display method and system, wherein the two-dimensional holographic projection display method includes: the spatial light modulator is divided into a first modulation area and a second modulation area in the length direction, and the first incident light beam is An incident angle irradiates the first modulation area to form a first projection area on the imaging plane; a second incident light beam irradiates the second modulation area at a second incident angle to form a second projection area on the imaging plane, The second projection area and the first projection area are closely attached or partially overlapped in the length direction of the spatial light modulator, and are spliced ​​to form a nearly rectangular image area. The two-dimensional holographic projection display method and system proposed by the present invention avoid the waste of computing resources and the spatial bandwidth product of the spatial light modulator, and can form an image area suitable for people's viewing habits.

Description

technical field [0001] The present invention relates to the technical field of projection display, in particular to a two-dimensional holographic projection display method and system. Background technique [0002] Most of the two-dimensional holographic projection devices based on phase modulation devices are based on the fast Fourier transform algorithm. Since the fast Fourier transform algorithm itself implies sampling restrictions on the spatial domain and the frequency domain, there is a strict correspondence between the frequency domain and the spatial domain. In two-dimensional holographic projection, the imaging plane is a spatial plane, and the spatial light modulator is a frequency domain plane. A two-dimensional image is obtained on the surface. [0003] Limited by the Fourier transform relationship, the size of the imaging area is only determined by the pixel pitch a of the spatial light modulator, and has nothing to do with the size of the available area of ​​th...

AI Technical Summary

Problems solved by technology

The pixels of existing spatial light modulators are generally arranged at two-dimensional equidistant intervals, so the image area formed on the imaging surface is square, and the available modulation area of ​​the spatial light modulator itself is generally rectangular (for example, the more typical spatial light modulation The device has a rectangular modulation area with a resolution of 16:9), which will cause oversampling in the direction of the long side when applied to a square display, resulting in a waste of computing resources and the spatial bandwidth product of the spatial light modulator

In addition, human vision is more accustomed to viewing rectangular image areas, and the square image area formed by holographic projection is not suitable for human viewing habits.

Images