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:
Jul. 20, 2021
Filed:
Sep. 19, 2017
Sharp Kabushiki Kaisha, Sakai, JP;
Hirotoshi Yasunaga, Sakai, JP;
Hisashi Watanabe, Sakai, JP;
SHARP KABUSHIKI KAISHA, Sakai, JP;
Abstract
Provided are an edge-lit surface light source device and a liquid crystal display device, both of which are capable of two-dimensional local dimming without image contrast being reduced due to stray light. Even when light from LEDs that should be extracted by means of a light extraction pattern provided in a first section of a light guide plate is passed through the first section without being extracted, the light repeatedly strikes on a light absorbing layer formed in a second section, whereby much of the light is absorbed in the second section. Accordingly, little light from the LEDs is extracted from a third section, from which light from LEDs should originally be extracted, with the result that image contrast can be prevented from being reduced due to stray light. Moreover, the light absorbing layer has a front transmittance of as high as 95 to 99%, whereby, for example, much of the light that is extracted from the second section of another light guide plate is transmitted through the second section of the light guide plate to a display-surface side, and therefore, little light is influenced by the light absorbing layer.