US Patent Issued to KEIWA on July 1 for "Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit" (Japanese Inventors)

ALEXANDRIA, Va., July 3 -- United States Patent no. 12,345,980, issued on July 1, was assigned to KEIWA Inc. (Tokyo).

"Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit" was invented by Hiroaki Ueno (Tokyo) and Chengheng Tsai (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical sheet laminate 100 is built in a backlight unit 40. The optical sheet laminate 100 includes a plurality of diffusion sheets 43 each having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape, and a pair of prism sheets 44 and 45 arranged above the plurality of diffusion sheets 43...