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:
Jun. 05, 2012
Filed:
May. 26, 2009
Takashi Shimura, Yamanashi-ken, JP;
Taku Kumasaka, Tsuru, JP;
Takashi Shimura, Yamanashi-ken, JP;
Taku Kumasaka, Tsuru, JP;
Citizen Electronics Co., Ltd., Yamanashi-ken, JP;
Abstract
A planar light-emitting device allowing for high luminance uniformity has a plurality of light-emitting units (), each including a lightguide plate () having a light-exiting surface, an opposite surface opposite to the light-exiting surface, a peripheral side surface extending between the respective peripheral edges of the light-exiting surface and the opposite surface, and a light-entrance surface () defined by a part of the peripheral side surface. Each light-emitting unit further includes a light source () adjacently disposed to face the light-entrance surface to emit light into the lightguide plate through the light-entrance surface. The light-emitting units are arranged in a plurality of mutually adjacent rows with the light-exiting surfaces () of their respective lightguide plates being substantially flush with each other. Adjacent rows of the light-emitting units are displaced relative to each other in the direction of the rows.