US Patent Issued to KEIWA on Sept. 8 for "Optical sheet, backlight unit, liquid crystal display apparatus, and information device" (Japanese Inventor)

ALEXANDRIA, Va., Sept. 8 -- United States Patent no. 12,730,342, issued on Sept. 8, was assigned to KEIWA Inc. (Tokyo).

"Optical sheet, backlight unit, liquid crystal display apparatus, and information device" was invented by Kenta Sasa (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical sheet 5 is an optical sheet, at least a first surface of the optical sheet has unevenness. A sparkle contrast of the first surface measured in conformity with JIS C 1006: 2019 is 4% or less. An arithmetic average roughness Ra of the first surface measured in conformity with JIS B 0601: 2001 (with an assessment length set to 290 micro metre) may be 0.6 micro metre or less. A peak count RPc of the first surface me...