Holographic three-dimensional projection screen and projection method thereof

Abstract

The invention discloses a holographic three-dimensional projection screen and a projection method thereof. The projection screen includes a base material layer, which is combined with the surface of the base material layer, and is distributed with an off-axis response structure and a controllable diffusion structure. The off-axis response structure makes the incident The light is deflected to the observation area as a whole; the controllable diffusion structure diffuses the incident light along one or two dimensions, realizes the linear interpolation of the discrete three-dimensional spatial angle spectrum, forms continuous three-dimensional spatial information, and realizes stereoscopic projection; the off-axis response The parameters of the structure and the controllable diffusion structure are independently modulated. The projection light is composed of multiple beams of light incident at different angles that carry the image information of the angle. The projection light is deflected by the off-axis response structure to the observation area, and is formed by the controllable diffusion structure. The diffusion of light incident at different angles The rays are spliced ​​together to form a continuous spatial angular spectrum. The invention can simultaneously realize off-axis projection and holographic stereoscopic projection, has good stereo effect and high energy utilization rate.

Description

technical field [0001] The invention relates to a projection screen and a manufacturing method thereof, in particular to a holographic display screen which adopts a micro-nano structure to realize a three-dimensional projection function and a manufacturing method thereof. Background technique [0002] Projection display is an important technology to realize large-format display. The performance of the projection screen is closely related to the effect of projection display. The parameters of the projection screen must be optimized and designed according to the parameters of the projection system. The two match each other to achieve the best effect. [0003] Common projection screens currently on the market include: white plastic projection screens, glass bead projection screens, and silver pearl projection screens, etc. These screens have disadvantages such as low gain, low energy utilization, low signal-to-noise ratio, and susceptibility to ambient light. . [0004] Hologr...

AI Technical Summary

Problems solved by technology

However, this kind of screen can only be used for coaxial front projection display, and there is a certain angle between the projection direction of the usual projection display and the observer, so the scope of use of this kind of projection screen is limited, and off-axis projection display cannot be realized

According to the manufacturing method of the projection screen disclosed in the patent, it can be seen that the spectral broadening of this screen is not uniform, the diffraction efficiency is low, and it is easily interfered by zero-order light, making it difficult to manufacture.

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