Circular polarization plate for organic EL display device and organic EL display device

A circularly polarizing plate for an organic EL display apparatus, comprising in this order:

• a polarizer;
• a retardation layer functioning as a λ/4 plate;
• another retardation layer functioning as a λ/2 plate between the polarizer and the retardation layer,
• a barrier layer;
• and
• a pressure-sensitive adhesive layer having a barrier function,
• wherein an angle formed between an absorption axis of the polarizer and a slow axis of the retardation layer is from 65° to 85°, and an angle formed between the absorption axis of the polarizer and a slow axis of the another retardation layer is from 10° to 20°,
• the polarizer is elongated and has the absorption axis in a longitudinal direction thereof;
• and
• the retardation layer and the another retardation layer are elongated, and the retardation layer has the slow axis in a direction at from 65° to 85° relative to a longitudinal direction thereof, and the another retardation layer has the slow axis in a direction at from 10° to 20° relative to a longitudinal direction thereof.