Projection screen and processing method therefor
US11906891B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2019 |
| Grant date | Feb 20, 2024 |
| Priority date | — |
| Expiry date | Jun 23, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projection screen and a processing method therefor, wherein the projection screen comprises, in sequence from the incident side of projection light, a diffusion layer, a microlens array and a substrate. The inner side of the substrate is provided with a Fresnel microstructure, and part of the surface of the Fresnel microstructure is provided with a reflecting layer while the remaining part of the surface is a light absorbing layer. The microlens array is used for focusing the projection light on the reflecting layer. The reflecting layer is used for reflecting projection light back to the field of view of viewers. Ambient light is mostly absorbed by the light absorbing layer. The settings of the structure and dimension of the microlens array enable the projection light to be only incident onto the reflecting layer of the Fresnel microstructure and the ambient light to be mostly absorbed by the light absorbing layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.