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:
Apr. 21, 2015
Filed:
Jan. 23, 2012
Shigenori Tanaka, Osaka, JP;
Shigenori Tanaka, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A light guide plate () in the planar illumination device () in one example of the present invention has: first connecting surfaces () that respectively connect adjacent light-output surfaces; and second connecting surfaces () that respectively connect adjacent opposite surfaces. The light guide plate satisfies one of the following conditions: (condition 'i') the opposite surface () of light guide section (B) is higher in the light-output direction than the light-output surface () of the light guide section (C); (condition 'ii') the opposite surface of light guide section is at the same height in the light-output direction as the light-output surface of an adjacent light guide section; or (condition “iii”) the opposite surface of the light guide section is lower in the light-output direction than the light-output surface of the adjacent light guide section and the height difference in the light-output direction between the aforementioned opposite surface and the aforementioned light-output surface is at most 35% of the height difference between the light-output surface and opposite surface of each light guide section.