Light diffusion sheet, backlight unit, liquid crystal display apparatus, information device, and method of manufacturing light diffusion sheet

Abstract

A light-diffusing sheet includes a plurality of depressed portions formed in an approximately inverted polygonal pyramid on at least a first surface. Ridgelines that partition the plurality of depressed portions have a depressed shape between intersections of the ridgelines with respect to straight lines that connect the intersections. When an array pitch of the plurality of depressed portions is denoted by P and a dimension occupied by a curved portion of a vertex of each of the ridgelines in an array direction of the plurality of depressed portions is denoted by Wr, a ratio Wr/P is 0.3 or lower. A maximum height difference d between the straight lines connecting the intersections of the ridgelines and the ridgelines is 1 μm or more and 10 μm or less. The plurality of depressed portions include a depressed portion of which a vertex of the approximately inverted polygonal pyramid is formed in a linear shape.

Dependencies are inferred from the claim text.