US 11,960,199 B2
Projection screen
Fei Hu, Shenzhen (CN); Wei Sun, Shenzhen (CN); Lin Wang, Shenzhen (CN); and Yi Li, Shenzhen (CN)
Assigned to APPOTRONICS CORPORATION LIMITED, Guangdong (CN)
Appl. No. 17/597,381
Filed by APPOTRONICS CORPORATION LIMITED, Guangdong (CN)
PCT Filed Jun. 28, 2020, PCT No. PCT/CN2020/098452
§ 371(c)(1), (2) Date Jan. 4, 2022,
PCT Pub. No. WO2021/000792, PCT Pub. Date Jan. 7, 2021.
Claims priority of application No. 201910598796.8 (CN), filed on Jul. 4, 2019.
Prior Publication US 2022/0276551 A1, Sep. 1, 2022
Int. Cl. G03B 21/60 (2014.01); G03B 21/56 (2006.01); G03B 21/58 (2014.01); G03B 21/62 (2014.01); G03B 21/625 (2014.01)
CPC G03B 21/60 (2013.01) [G03B 21/56 (2013.01); G03B 21/58 (2013.01); G03B 21/62 (2013.01); G03B 21/625 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A projection screen, comprising:
an optical collimation layer and a surface diffusion layer that are sequentially disposed; and
a grating absorption layer configured to absorb ambient light from various directions except direction of incident projection light and disposed between the optical collimation layer and the surface diffusion layer,
wherein the grating absorption layer comprises ring-shaped light-absorbing units with different radiuses, wherein the ring-shaped light-absorbing units are arranged in a form of concentric rings, and at least two of gratings are arranged along a circumference of one of the concentric rings to form each of the ring-shaped light-absorbing units; and with a vertical symmetrical center line of the projection screen as a center, in directions extending towards a left side and a right side of the projection screen along the circumference of one of the concentric rings, distances between two adjacent gratings of the at least two gratings in one of the ring-shaped light-absorbing units increase gradually; and
wherein extension lines of length directions of the gratings in each of the concentric rings intersect at a circle center of the concentric rings.