Patent ID: 11867936
Assignee: LG CHEM, LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC G  C | IPC C  G

Claim 1:
2. The laminate film according to claim 1, wherein the retardation layer has an absolute value of a retardation change ratio according to Equation A below of 17% or less:

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

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