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:
Jan. 14, 2025
Filed:
Jan. 04, 2024
Applicant:
Keiwa Incorporated, Tokyo, JP;
Inventor:
Chengheng Tsai, Tokyo, JP;
Assignee:
KEIWA INCORPORATED, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F 1/13357 (2006.01); G02B 5/02 (2006.01); G02F 1/1335 (2006.01);
U.S. Cl.
CPC ...
G02F 1/133606 (2013.01); G02B 5/0268 (2013.01); G02B 5/0278 (2013.01); G02F 1/133614 (2021.01);
Abstract
An optical sheet laminateis to be incorporated into a backlight unithaving blue light sources. The optical sheet laminateinclude: a diffusion sheethaving a first surfacehaving a plurality of recesseshaving a substantially inverted quadrangular pyramid shape; and a pair of prism sheetsandhaving prism extending directions perpendicular to each other. The diffusion sheetincludes one or a plurality of diffusion sheets in layers. The plurality of recessesare arranged in a two-dimensional matrix, and the intersecting angle between an arrangement direction of the plurality of recessesand the prism extending direction is 20° or more and 70° or less.