Holographic solid projection screen and projection method

Abstract

The invention discloses a holographic solid projection screen and projection method. The projection screen comprises a substrate layer. An off-axis responding structure and a controllable diffusion structure are distributed by adhering to the surface of the substrate layer. The off-axis responding structure makes incident light wholly deflected to an observation zone. The controllable diffusion structure can make incident light to diffuse along a one-dimension direction or a two-dimension direction to realize linear interpolation of a scattering three-dimension space angular spectrum, form continuous three-dimension space information and achieve solid projection. Parameters of the off-axis responding structure and the controllable diffusion structure are modulated respectively and independently. The projected light rays are composed of multiple beams of light rays containing the angle image information and entering at different angles. The projected light rays are deflected to the observation zone by the off-axis responding structure and form diffusion light rays under the action of the controllable diffusion structure. The diffusion light rays of the light rays entering at different angles are mutually spliced to form a continuous space angular spectrum. According to the holographic solid projection screen and projection method, off-axis projection and holographic solid projection can be achieved at the same time, the solid effect is good and the energy utilization rate is high.

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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