US 11,686,973 B2
Optical film, backlight module, and display device
Chun-Hau Lai, Kaohsiung (TW); Wei-Hsuan Chen, Kaohsiung (TW); Yung-Hui Tai, Kaohsiung (TW); Chun-Yi Wu, Kaohsiung (TW); and Yuan-Chen Chung, Kaohsiung (TW)
Assigned to Radiant Opto-Electronics Corporation, Kaohsiung (TW)
Filed by Radiant Opto-Electronics Corporation, Kaohsiung (TW)
Filed on May 4, 2022, as Appl. No. 17/736,179.
Application 17/736,179 is a continuation of application No. PCT/CN2021/111964, filed on Aug. 11, 2021.
Prior Publication US 2023/0050100 A1, Feb. 16, 2023
Int. Cl. G02F 1/1335 (2006.01); G02F 1/13357 (2006.01)
CPC G02F 1/133607 (2021.01) [G02F 1/133603 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An optical film, comprising:
a substrate layer; and
at least two optical layers, which are stacked on the substrate layer and have complementary microstructures filled with each other, wherein the optical layer which closer to the substrate layer is the first optical layer, and the optical layer which farther from the substrate layer is the second optical layer, the refractive index of the first optical layer is smaller than the refractive index of the second optical layer, and the microstructure of the second optical layer has an acute angle.