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:
Dec. 24, 2024
Filed:
Mar. 01, 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); G02B 5/04 (2006.01); G02F 1/1335 (2006.01);
U.S. Cl.
CPC ...
G02F 1/133606 (2013.01); G02B 5/0278 (2013.01); G02B 5/045 (2013.01); G02F 1/133607 (2021.01);
Abstract
An optical sheet laminateis incorporated into a backlight unit. The optical sheet laminateincludes a plurality of diffusion sheetshaving a first surfacehaving a plurality of recesseshaving a substantially inverted quadrangular pyramid shape and arranged in a two-dimensional matrix, and a pair of prism sheetsandhaving prism extending directions perpendicular to each other. The plurality of diffusion sheetsinclude at least two diffusion sheetswhere an arrangement direction of the recessesof one of the at least two diffusion sheetsis different from that of the recesses of another one of the at least two diffusion sheets