Patent ID: 11953710
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC G  C  H | IPC C  G  H

Claim 5:
6. A method of selecting a retardation layer of a display panel comprising, with respect to a display panel including a display element (A), a retardation layer (B) positioned upon the light emission surface side of the display element, and a polarizer (C) positioned upon the light emission surface side of the retardation layer, and in which the retardation layer (B) includes a λ/4 retardation layer (B1), the selection of a λ/4 retardation layer satisfying the following condition 1 as the λ/4 retardation layer (B1):
<Condition 1>
The spectral reflectance of the display element is measured by a Specular Component Included (SCI) method, the average reflectance at wavelengths over the range of 400 nm or more and less than 550 nm is obtained as R1, the average reflectance at wavelengths over the range of 550 nm or more and less than 700 nm is obtained as R2, and when the value of R1/R2 is calculated and obtained as x, the in-plane retardation of the λ/4 retardation layer falls within the range of −4.6002x+119.24 nm or more and −4.6002x+129.24 nm or less.