US 12,269,250 B2
Polarizing plate and optical display device comprising same
Yoon Jung Kim, Suwon-si (KR); Sang Hum Lee, Suwon-si (KR); Ri Ra Jung, Suwon-si (KR); and Yeon Ju Jung, Suwon-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Appl. No. 17/593,905
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
PCT Filed Jun. 10, 2020, PCT No. PCT/KR2020/007520
§ 371(c)(1), (2) Date Sep. 27, 2021,
PCT Pub. No. WO2020/256337, PCT Pub. Date Dec. 24, 2020.
Claims priority of application No. 10-2019-0073170 (KR), filed on Jun. 19, 2019.
Prior Publication US 2022/0187522 A1, Jun. 16, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 7/023 (2019.01); B32B 27/32 (2006.01); G02B 5/30 (2006.01); G02F 1/13363 (2006.01)
CPC B32B 7/023 (2019.01) [B32B 27/32 (2013.01); G02B 5/305 (2013.01); B32B 2255/10 (2013.01); B32B 2255/26 (2013.01); B32B 2307/418 (2013.01); B32B 2307/42 (2013.01); B32B 2457/20 (2013.01); G02F 1/13363 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A polarizing plate comprising:
a polarizer; and
a first retardation layer, a second retardation layer and a third retardation layer sequentially stacked on a lower surface of the polarizer,
wherein the first retardation layer is a positive C retardation layer;
the second retardation layer exhibits positive dispersion and has an in-plane retardation of about 220 nm to about 280 nm at a wavelength of 550 nm;
the third retardation layer exhibits positive dispersion and has an in-plane retardation of about 80 nm to about 145 nm at a wavelength of 550 nm; and
assuming an absorption axis of the polarizer is tilted at an angle of 0°, the second retardation layer has a slow axis tilted at an angle θ2 of about +14° to about +24° or of about −24° to about −14° with respect to the absorption axis of the polarizer and the third retardation layer has a slow axis tilted at an angle θ3 of about +79° to about +89° or of about −89° to about −79° with respect to the absorption axis of the polarizer.