MUMBAI, India, July 31 -- Intellectual Property India has published a patent application (202647088259 A) filed by Dai Nippon Printing Co. , Ltd. on July 20, 2026, for Retardation Film, Elliptically Polarizing Plate, And Organic El Display Device.
Inventors include Hiruma Yusuke; Sutou Takanori; Takahashi Terutaka; Otsu Moeko; and Suzuki Kaita.
The application for the patent was published on July 24, 2026, under issue no. 30/2026.
Abstract: This retardation film comprises a laminate including a first retardation layer and a second retardation layer overlapping the first retardation layer. Ny1 Nx1 Nz1 is established where: Nx1 represents the refractive index of the first retardation layer in a direction in which the in-plane slow axis of the first retardation layer extends; Ny1 represents the refractive index of the first retardation layer in a direction perpendicular to the direction in which the in-plane slow axis of the first retardation layer extends and the thickness direction of the first retardation layer; and Nz1 represents the refractive index of the first retardation layer in the thickness direction thereof. The second retardation layer is a positive A-type retardation layer. The direction in which the in-plane slow axis of the first retardation layer extends and the direction in which the in-plane slow axis of the second retardation layer extends form an angle ? which is 15°-75°. Formulae (i)-(iii) are achieved when: ReAC550 represents the in- plane retardation of the laminate at a wavelength of 550 nm; ReAC450 represents the in-plane retardation of the laminate at a wavelength of 450 nm; and RthAC550 represents the thickness-direction retardation of the laminate at a wavelength of 550 nm.
Disclaimer: Curated by HT Syndication.
