Patent ID: 9261636
Filing Date: 2016-02-16
CPC Classification: G02B,Y10T

Claim Text:
1. A polarizing plate, comprising: a polarizer, a half-wavelength (λ/2) retardation film, and a quarter-wavelength (λ/4) retardation film, wherein an absolute orthogonal b-coordinate value based on a CIELAB color coordinate system is approximately 3 or less when the polarizing plate is stacked with a reference polarizing plate having a degree of polarization of at least 99.9% such that an angle between an absorption axis of the polarizer and a reference absorption axis of a reference polarizer of the reference polarizing plate is 90°, wherein at a wavelength of 550 nanometers, the quarter-wavelength (λ/4) retardation film has an out-of-plane retardation value ranging from approximately −100 nanometers to approximately −130 nanometers, and wherein the out-of-plane retardation value (Rth) is calculated using the formula Rth=((nx+ny)/2−nz)×d, wherein nx, ny, and nz are refractive indexes in x-, y-, and z-axis directions of each retardation film, and d is a thickness of the retardation film.