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:
Mar. 05, 2019
Filed:
Dec. 06, 2016
Keiwa Inc., Tokyo, JP;
Tadayuki Nonaka, Tokyo, JP;
Keiwa Inc., Tokyo, JP;
Abstract
A light diffusion sheet for overlaying is to be provided on a front face side of a prism sheet in a backlight unit of a liquid crystal display device, and has a substrate layer and a light diffusion layer overlaid on a front face side of the substrate layer, in which the light diffusion layer contains a resin matrix and resin beads dispersed in the resin matrix, wherein: a mode diameter in a volume-weighted particle size distribution of the resin beads is no less than 2.5 μm and no greater than 5.5 μm; a density of the resin beads per unit area is no less than 9,000 beads/mmand no greater than 24,000 beads/mm; and an average thickness of the light diffusion layer is no less than 2 μm and no greater than 9 μm.