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:
Dec. 23, 2003
Filed:
Mar. 13, 2002
Masato Obata, Niigata, JP;
Nippon Seiki Co., Ltd., Niigata, JP;
Abstract
There is provided a backlight device which is bright and has low unevenness of luminance, and a backlight device is constituted by a translucent sheet having light diffusibility, a light emitting element disposed behind the translucent sheet , and a prism sheet disposed between the light emitting element and the translucent sheet and having a prism surface on which plural rows of prism portions each having a pair of inclined surfaces (hem sides B and C) intersecting with each other at a top A and a substantially V-shaped section are formed, and a plane surface portion formed on a surface opposite to the prism surface , in which the prism sheet is disposed away from the light emitting element and the translucent sheet by distances W and W so that the prism surface is faced toward the light emitting element