US Patent Issued to Dai Nippon Printing on Jan. 28 for "Plastic film for optical applications, polarization plate, and image display device" (Japanese Inventors)

ALEXANDRIA, Va., Jan. 29 -- United States Patent no. 12,210,176, issued on Jan. 28, was assigned to Dai Nippon Printing Co. Ltd. (Tokyo).

"Plastic film for optical applications, polarization plate, and image display device" was invented by Seiichi Isojima (Okayama, Japan) and Takashi Kuroda (Moriya, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical plastic film can suppress rainbow unevenness when viewed with naked eyes and blackout when viewed with polarized sunglasses without high in-plane retardation. The film has an average of in-plane retardations of 600 nm or less and satisfies: when a sample with a size of 50 mm in lengthx50 mm in width is cut out of the film, slow axis directions are me...