US 12,468,070 B2
Optical film, optical-film-equipped polarizing plate, and display device
Masashi Miyashita, Tokyo (JP); Yuki Katsura, Tokyo (JP); and Kazunobu Ogawa, Tokyo (JP)
Assigned to Dai Nippon Printing Co., Ltd., Tokyo (JP)
Appl. No. 17/904,112
Filed by Dai Nippon Printing Co., Ltd., Tokyo (JP)
PCT Filed Nov. 18, 2020, PCT No. PCT/JP2020/042966
§ 371(c)(1), (2) Date Aug. 12, 2022,
PCT Pub. No. WO2021/161209, PCT Pub. Date Aug. 19, 2021.
Claims priority of application No. 2020-022518 (JP), filed on Feb. 13, 2020; and application No. 2020-157680 (JP), filed on Sep. 18, 2020.
Prior Publication US 2023/0083180 A1, Mar. 16, 2023
Int. Cl. G02B 1/11 (2015.01); G02B 5/30 (2006.01); H10K 59/80 (2023.01)
CPC G02B 1/11 (2013.01) [G02B 5/3025 (2013.01); H10K 59/879 (2023.02); H10K 59/8791 (2023.02)] 20 Claims
OG exemplary drawing
 
1. An optical film comprising:
a substrate;
a surface member provided on a front surface of the substrate; and
an optical functional layer provided on a back surface of the substrate,
wherein the optical functional layer includes a first layer and a second layer that has a refractive index different from a refractive index of the first layer and that is joined to the first layer on the substrate side of the first layer,
wherein a first interface between the first layer and the second layer has a recessed/protruding shape,
wherein the refractive index of the second layer, a refractive index of the substrate, and a refractive index of the surface member become smaller in this order, and
wherein a coloring material is provided closer to the second layer than to the first interface.