Projection screen and projection system

Abstract

The embodiment of the invention provides a projection screen and a projection system which relate to the field of projection screens, and can better inhibit the occurrence of a speckle phenomenon on the basis of ensuring the image resolution of a projected image. The projection screen is used for reflecting the projection light beams of a projector, and in the reflection direction of the projection light beams, the projection screen comprises a light gathering layer arranged at the light emitting side of a coloring layer and a surface scattering layer arranged at the light emitting side of thelight condensation layer, wherein the light gathering layer is used for gathering the projection light beams emitted by the coloring layer, the roughness of one surface, far away from the gathering layer, of the surface scattering layer is greater than or equal to the preset roughness, and the surface scattering layer is used for scattering the projection light beams gathered by the light gathering layer and emitting the scattered projection light beams to the human eyes outside the projection screen.

Description

technical field [0001] The invention relates to the field of projection screens, in particular to a projection screen and a projection system. Background technique [0002] "Speckle" is also called "laser speckle". The speckle phenomenon generally exists in the process of optical imaging. Due to the high coherence of the laser, the laser speckle phenomenon is more obvious. Laser speckle is a kind of irregularly distributed bright and dark spots that can be observed in the light field near the scattering surface or when the laser is diffusely reflected from the surface of the scattering body or passes through a transparent scattering body (such as ground glass). In laser projection technology, because the laser light needs to pass through the projection lens of the projector, and the projection lens is a transparent scatterer, when the laser beam emitted through the projection lens is projected onto the projection screen, there will be speckle problems. At present, the most...

AI Technical Summary

Problems solved by technology

At present, the most serious speckle is the RGB three-color laser light source, because the three lasers have coherence, and the appearance of speckle has a lot to do with the coherence of the laser, so although the RGB laser light source is the most advanced, the speckle problem solution is the most difficult

[0003] Because the speckle severity of two-color laser sources is weaker than that of three-color laser sources, and the speckle severity of monochrome laser sources is weaker than that of two-color laser sources, so although the currently used laser projection The speckle of the light source has a certain inhibitory effect, and the user will basically not notice the speckle problem during use; but when the laser projection light source uses a three-color laser light source, its ability to suppress speckle is relatively poor, and the user in It is easy to detect the speckle problem when viewing, which seriously affects the user experience

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