US Patent Issued to KEIWA on Dec. 30 for "Light diffusion sheet, backlight unit, liquid crystal display device, and information equipment" (Japanese Inventor)

ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,510,783, issued on Dec. 30, was assigned to KEIWA Inc. (Tokyo).

"Light diffusion sheet, backlight unit, liquid crystal display device, and information equipment" was invented by Chengheng Tsai (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A light diffusion sheet 43 includes: a first surface 21a as a light emission surface; and a second surface 21b as a light incident surface. The first surface 21a includes a plurality of recesses 22 each having an approximately inverted polygonal pyramid shape. The second surface 21b has an arithmetic mean roughness of 3.0 micro metre or less. The light diffusion sheet 43 has an internal haze of 1.5% or less." ...