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. 25, 2018
Filed:
Dec. 15, 2016
Lg Display Co., Ltd., Seoul, KR;
Covestro Deutschland Ag, Leverkusen, DE;
Hyungseok Bang, Gyeonggi-do, KR;
Seungman Ryu, Gyeonggi-do, KR;
Joobong Hyun, Seoul, KR;
Yongku Lee, Gyeonggi-do, KR;
Dongyeon Kim, Busan, KR;
Friedrich-Karl Bruder, Krefeld, DE;
Günther Walze, Köln, DE;
LG Display Co., Ltd., Seoul, KR;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
The disclosure relates to a viewing angle switchable back light unit wherein a general mode and a privacy mode in a liquid crystal display can be selected. A thin film type back light unit includes a light guide film, a light radiator, a first light source, and a light collimator. The light guide film includes a light entering part at one side, a light guiding part extending from the one side to an opposite side of the one side, and a light radiating part on one plane surface. The light radiator is on the light radiating part. The first light source faces the light entering part. The light collimator is on the light entering part facing the first light source. The light collimator receives an expanding light from the first light source, converts the expanding light into collimated light, and provides the collimated light to the light entering part.