US 12,153,238 B2
Polarizing plate and optical display device including same
Sung Man Cho, Suwon-si (KR); Mun Bo Ko, Suwon-si (KR); Ki Yong Kim, Suwon-si (KR); Yeon Ju Na, Suwon-si (KR); and Eun Sol Cho, Suwon-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Appl. No. 17/439,341
Filed by SAMSUNG SDI CO., LTD., Yongin-si (KR)
PCT Filed Mar. 3, 2020, PCT No. PCT/KR2020/003021
§ 371(c)(1), (2) Date Sep. 14, 2021,
PCT Pub. No. WO2020/189925, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 10-2019-0031877 (KR), filed on Mar. 20, 2019.
Prior Publication US 2022/0195081 A1, Jun. 23, 2022
Int. Cl. G02B 5/30 (2006.01); B32B 7/12 (2006.01); B32B 23/20 (2006.01); B32B 27/30 (2006.01); C08F 20/06 (2006.01); G02F 1/1335 (2006.01); B32B 23/08 (2006.01)
CPC G02B 5/3033 (2013.01) [B32B 7/12 (2013.01); B32B 23/20 (2013.01); B32B 27/306 (2013.01); C08F 20/06 (2013.01); G02B 5/30 (2013.01); G02F 1/1335 (2013.01); G02F 1/133528 (2013.01); B32B 23/08 (2013.01); B32B 2250/40 (2013.01); B32B 2255/10 (2013.01); B32B 2307/4026 (2013.01); B32B 2307/42 (2013.01); B32B 2457/20 (2013.01); C08F 2810/20 (2013.01); C09K 2323/031 (2020.08)] 14 Claims
 
1. A polarizing plate comprising a polarizer film,
the polarizer film comprises a zinc cation coupled to a unit represented by the following Formula 1:

OG Complex Work Unit Chemistry
where * is a linking site,
R is a hydrogen or a C1 to C5 alkyl group,
n is an integer of 10 to 100,000, and m is an integer of 0 to 10,
wherein the polarizing plate has a chrominance variation ΔE of 5.2 or less, as calculated by Equation 1:
ΔE=[(ΔL)+(Δa*)2+(Δb*)2]1/2  [Equation 1]
where ΔL is L2-L1; Δa* is (a*)2−(a*)1; and Δb* is (b*)2−(b*)1, in which L1 is an L value of the polarizing plate before the polarizing plate is left at about 95° C. for about 500 hours; L2 is an L value of the polarizing plate after the polarizing plate is left at about 95° C. for about 500 hours; (a*)1 is an a* value of the polarizing plate before the polarizing plate is left at about 95° C. for about 500 hours; (a*)2 is an a* value of the polarizing plate after the polarizing plate is left at about 95° C. for about 500 hours; (b*)1 is a b* value of the polarizing plate before the polarizing plate is left at about 95° C. for about 500 hours; and (b*)2 is a b* value of the polarizing plate after the polarizing plate is left at about 95° C. for about 500 hours, where the L value, the a* value, and the b* value indicate color space values according to CIE1976 and are measured using a spectrophotometer.