Retardation film polarizing plate and display panel device

• Main Authors: MURAKAMI NAO, SHIMIZU TAKASHI
• Format: Patent
• Language: English; Korean
• Published: 06.12.2017
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PHYSICS; SEMICONDUCTOR DEVICES; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

연신된 고분자 필름을 포함하는 위상차 필름이며, 아래 식 (1) 내지 (3)： 0.70＜Re［450］/Re［550］＜0.97···(1) 1.5×10Δn＜6×10···(2) 1.13＜NZ＜1.50···(3) (식중, Re［450］및 Re［550］은, 각각, 23℃에 있어서의 파장 450nm 및 550nm의 빛으로 측정한 위상차 필름의 면내의 위상차 값이며, Δn는 위상차 필름의 지상축방향, 진상축방향의 굴절률을, 각각 nx, ny로 했을 때의 nx－ny인 면내 복굴절이며, NZ는 nz를 위상차 필름의 두께 방향의 굴절률로 했을 때의, 두께 방향 복굴절인 nx-nz와 면내 복굴절인 nx－ny와의 비율이다.)을 만족시키는 위상차 필름. A retardation film which comprises a stretched polymer film and satisfies the following formulae (1) to (3): 0.70<Re[450]/Re[550]<0.97(1); 1.5×10-3<Deltan<6×10-3(2); and 1.13<NZ<1.50(3), wherein: Re[450] and Re[550] represent in-plane retardation values of the retardation film as measured at 23° C. using light with a wavelength of 450 nm and light with a wavelength of 550 nm, respectively; Deltan represents an in-plane birefringence equal to (nx-ny) (where nx and ny represent refractive indexes in a slow axis direction and a fast axis direction of the retardation film, respectively); and NZ represents a ratio of a thickness-direction birefringence equal to (nx-nz) (where nz represents a refractive index in a thickness direction of the retardation film) to the in-plane birefringence equal to (nx-ny).