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:
May. 12, 2026
Filed:
Apr. 25, 2025
Applicant:
Keiwa Incorporated, Tokyo, JP;
Inventor:
Chengheng Tsai, Tokyo, JP;
Assignee:
KEIWA Incorporated, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F 1/00 (2006.01); G02F 1/13357 (2006.01);
U.S. Cl.
CPC ...
G02F 1/133606 (2013.01); G02F 1/133603 (2013.01);
Abstract
A light diffusion sheet is incorporated in a backlight unit using a plurality of light sources arranged in a two-dimensional matrix. The light diffusion sheet has surfaces, on at least one of which a plurality of recesses having a substantially inverted quadrangular pyramid shape are arranged in a two-dimensional matrix. An intersecting angle between an arrangement direction of the plurality of recesses and an arrangement direction of the plurality of light sources is 30° or more and 60° or less.