Projection screen and ultra-short-focus projection system having projection screen

Abstract

The invention discloses a projection screen and an ultra-short-focus projection system. The projection screen receives image light beams emitted by a projection device, and comprises a reflecting layer, a lens layer, an isolation layer and a scattering layer, wherein the isolation layer is arranged between the scattering layer and the lens layer; the image light beams pass through the scattering layer, the isolation layer and the lens layer in sequence and reach the reflecting layer after being emitted from the projection device; and after being reflected by the reflecting layer, the image light beams pass through the lens layer, the isolation layer and the scattering layer again and then, enter the human eyes. The ultra-short-focus projection system comprises the ultra-short-focus projection device and the projection screen. Laser generated by the ultra-short-focus projection device is projected onto the projection screen to form an image on the projection screen. The projection screen and the ultra-short-focus projection system can obviously reduce speckles of the projection screen.

Description

technical field [0001] The invention relates to the field of projection display, in particular to a projection screen and an ultra-short-focus projection system with the projection screen. Background technique [0002] When performing projection display, a projector is generally used together with a projection screen, so that the projected image has higher color resolution, better color saturation, and higher brightness. [0003] Such as figure 1 As shown, it is a schematic structural diagram of a projection screen in the prior art. The projection screen 100 generally includes a substrate layer 101 , a scattering layer 102 , a lens layer 103 and a reflection layer 104 , wherein the scattering layer 102 is adjacent to the lens layer 103 . The light emitted by the projector 105 is refracted by the substrate layer 101 and then enters the scattering layer 102. The scattering layer 102 diffuses the light into a beam with a certain angle. After the scattering layer 102 passes thr...

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Problems solved by technology

[0004] Because the scattering layer 102 includes a lot of tiny scattering particles, different light rays (i.e. light beams) reflected back by the reflective layer 104 go through different route lengths after being scattered by the scattering particles of the scattering layer 102, but because the scattering layer 102 is in phase with the lens layer 103 Adjacent to the setting, the diffusion degree of the beam is not high, and the scattering particles passing by are less, so that the optical path difference (phase difference) between most of the light rays remains unchanged, and the probability of a constant phase or a constant optical path difference is relatively large, so it still produces The more obvious interference phenomenon, at the viewing angle of the human eye, will form bright and dark flickering spots in the projected image screen, that is, the speckle phenomenon, which affects the viewing quality of the image

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