The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2025
Filed:
Jul. 25, 2024
Keiwa Incorporated, Tokyo, JP;
Hiroaki Ueno, Tokyo, JP;
Chengheng Tsai, Tokyo, JP;
KEIWA Incorporated, Tokyo, JP;
Abstract
An optical sheet laminateis built in a backlight unit. The optical sheet laminateincludes a plurality of diffusion sheetseach having a first surfacehaving a plurality of recesseshaving a substantially inverted quadrangular pyramid shape, and a pair of prism sheetsandarranged above the plurality of diffusion sheetsand having prism extending directions perpendicular to each other. The recesseshave an apex angle of 95° or more. The recessesare arrayed in a two-dimensional matrix. The prism extending direction of a lower prism sheetand the arrangement direction of the recesseson an upper diffusion sheetA intersect with each other at an angular difference of 30° or less.