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:
Sep. 03, 2019
Filed:
Mar. 14, 2018
Keiwa Inc., Tokyo, JP;
Takahiro Tsuji, Tokyo, JP;
KEIWA INC., Tokyo, JP;
Abstract
A liquid crystal display device includes a liquid crystal panel, a light-guiding plate on a back face of the liquid crystal panel, at least one LED light source along an end face of the light-guiding plate, and a turning film between the liquid crystal panel and the light-guiding plate. The turning film includes a substrate layer and a prism array on a back face of the substrate layer. A retardation value of the substrate layer is no less than 180 nm and no greater than 415 nm. In a planar view: an intersection angle α between a transmission axis of the back face side-polarizing plate and ridge lines in the prism array is no less than 0° and less than 90°; the ridge lines are parallel to the end face; and an intersection angle between a slow axis of the substrate layer and the transmission axis is (45−α/2)°.