Patent ID: 11892669
Assignee: LG CHEM, LTD.
Field: Optics (Instruments)
Classification: CPC G  C | IPC C  G

Claim 1:
2. The polarizing plate according to claim 1, wherein the first retardation layer has an absolute value of a retardation change ratio of 17% or less, wherein the retardation change ratio is calculated according to Equation A:

Retardation change ratio=100×(Ra−Ri)/Ri,  [Equation A]

Wherein in Equation A, Ri is an initial in-plane retardation of the first retardation layer for light having a wavelength of 550 nm, and Ra is an in-plane retardation of the first retardation layer for light having a wavelength of 550 nm after an endurance condition, wherein the endurance condition comprises maintaining the first retardation layer at a temperature of 85° C. for 50 hours or more.