US 12,248,157 B2
Projection screen
Lin Wang, Guangdong (CN); Xiaofeng Tang, Guangdong (CN); Wei Sun, Guangdong (CN); and Yi Li, Guangdong (CN)
Assigned to APPOTRONICS CORPORATION LIMITED, Guangdong (CN)
Appl. No. 17/597,394
Filed by APPOTRONICS CORPORATION LIMITED, Guangdong (CN)
PCT Filed Jun. 28, 2020, PCT No. PCT/CN2020/098459
§ 371(c)(1), (2) Date Jan. 4, 2022,
PCT Pub. No. WO2021/004301, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 201910605044.X (CN), filed on Jul. 5, 2019.
Prior Publication US 2022/0268975 A1, Aug. 25, 2022
Int. Cl. G02B 5/02 (2006.01); G02B 27/01 (2006.01)
CPC G02B 5/0242 (2013.01) [G02B 5/0284 (2013.01); G02B 27/0101 (2013.01); G02B 2027/0118 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A projection screen, comprising:
a microstructure layer, wherein the microstructure layer comprises a transparent substrate and a microstructure unit formed on a surface of the transparent substrate;
wherein the microstructure unit comprises triangular pyramid units arranged in an array, wherein at least two of the triangular pyramid units that are arranged in a same row are identical to each other, wherein at least two triangular pyramid units of the triangular pyramid units that are arranged in a same column respectively have vertex angles that vary gradually, and each of the vertex angles forms between the surface of the transparent substrate and an edge of one of the triangular pyramid units that has the vertex angle.