US 11,656,392 B2
Optical element and wafer level optical module
Chih-Sheng Chang, Tainan (TW); Meng-Ko Tsai, Tainan (TW); and Teng Te Huang, Tainan (TW)
Assigned to HIMAX TECHNOLOGIES LIMITED, Tainan (TW)
Filed by HIMAX TECHNOLOGIES LIMITED, Tainan (TW)
Filed on Aug. 11, 2020, as Appl. No. 16/990,989.
Prior Publication US 2022/0050235 A1, Feb. 17, 2022
Int. Cl. G02B 5/20 (2006.01); B29D 11/00 (2006.01)
CPC G02B 5/20 (2013.01) [B29D 11/00634 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical element, comprising:
a substrate;
a first optical film and a second optical film, disposed on at least one side of the substrate and both formed on the substrate, the first optical film has a first surface facing away from the substrate and a plurality of first optical microstructures disposed on the first surface, the second optical film has a second surface facing away from the substrate and a plurality of second optical microstructures disposed on the second surface, wherein the orthogonal projection of the first optical microstructures on the substrate does not overlap the orthogonal projection of the second optical microstructures on the substrate; and
a buffer layer, disposed between the substrate and the second optical film, and directly connects the second optical film, wherein the orthogonal projection of the buffer layer on the substrate does not overlap the orthogonal projection of the first optical microstructures.