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. 09, 2014
Filed:
Nov. 17, 2011
Shoji Yamamoto, Fujisawa, JP;
Satoshi Ouchi, Kamakura, JP;
Mayumi Nagayoshi, Chofu, JP;
Hajime Inoue, Obihiro, JP;
Shoji Yamamoto, Fujisawa, JP;
Satoshi Ouchi, Kamakura, JP;
Mayumi Nagayoshi, Chofu, JP;
Hajime Inoue, Obihiro, JP;
Hitachi Consumer Electronics Co., Ltd., Tokyo, JP;
Abstract
To provide a back light unit that reduces an uneven brightness and has a spatially uniform brightness distribution. According to an aspect of the present invention, the back light unit comprises an LED and a light guide plate for guiding light from the LED to a liquid crystal panel side, wherein a recess is provided on the back surface side of the light guide plate, wherein a plurality of LEDs are housed in the recess, and wherein a light amount limiting member is provided at a position facing the recess on s light exit surface side of the light guide plate. The light amount limiting member is configured, for example, by applying an ink with a predetermined optical property to a transparent sheet.