Dai Nippon Printing Co., Ltd.

Arimichi Ito

Toshiyuki Suzuki

Nobuhito Toyama

An antireflection structure () comprises a base (), and a finely roughened antireflection part () formed in a surface of the base (). The finely roughened antireflection part () includes a plurality of projections and depressions defined by the projections. The projections are distributed such that P&#x2266;&#x3bb;, where Pis the biggest one of distances between tips () of the adjacent projections and &#x3bb;is the shortest one of wavelengths of visible light rays in a vacuum. The sectional area of each projection in a plane parallel to the surface of the base () increases continuously from the tip () toward the bottom () of the depression adjacent to the projection. The shape () of a tip part (Mt) of each projection in a plane perpendicular to the surface of the base () is sharper than the shape () of a bottom part (Mb) of each depression in the same plane vertical to the surface of the base ().

Antireflection structure

A cover plate covering a display panel of a display device has a transparent base having a surface facing the display panel and provided with reflection-reducing minute irregularities. The reflection-reducing minute irregularities consist of numerous projections and numerous valleys lying between the projections, and meet a condition expressed by: P &lE;&lgr; , where P is the maximum distance between the tips of the adjacent projections, and &lgr; is the minimum wavelength in a visible region in a vacuum. The sectional area ratio of total area of sections of the projections of the transparent base in a plane parallel to the transparent base in the plane increases continuously and gradually in a direction from the tips of the projections toward bottoms of the valleys.

Growing community of inventors

Shinjuku-ku, Japan

Arimichi Ito