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:
Nov. 30, 2004
Filed:
Dec. 30, 2002
Koji Asakawa, Kanagawa-ken, JP;
Akira Fujimoto, Kanagawa-ken, JP;
Hitoshi Sugiyama, Kanagawa-ken, JP;
Kenichi Ohashi, Kanagawa-ken, JP;
Kenji Suzuki, Kanagawa-ken, JP;
Junichi Tonotani, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A nanometer size roughened structure is formed on a surface of a light-emitting element, and luminous efficiency is improved. The roughened structure is formed into the following shape to change refractive index smoothly: (1) the mean diameter of projections on the roughened surface is smaller than the light wavelength; (2) a pitch of the roughened surface is irregular; and (3) positions of the top and bottom of the roughened surface are distributed from their mean values within the light wavelength. The surface of such light-emitting element is obtained by forming a thin film on the surface of the light-emitting element using a block or graft copolymer comprising resin composition and forms a self-assembled microphase-separated structure; selectively removing at least one phase of the microphase-separated structure; and etching the surface of the light-emitting element using the remaining phase as an etching mask.