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:
Mar. 27, 2012
Filed:
Jan. 08, 2009
Seiji Manabe, Fukuoka, JP;
Kensei Fukuda, Saga, JP;
Takahiro Oomori, Fukuoka, JP;
Shinobu Kamizuru, Fukuoka, JP;
Sumio Tate, Fukuoka, JP;
Kazuyuki Nakashima, Fukuoka, JP;
Seiji Manabe, Fukuoka, JP;
Kensei Fukuda, Saga, JP;
Takahiro Oomori, Fukuoka, JP;
Shinobu Kamizuru, Fukuoka, JP;
Sumio Tate, Fukuoka, JP;
Kazuyuki Nakashima, Fukuoka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A surface lighting device has one single light source and a light-guide-board. The board includes a light-guiding-section and a light-emitting-section. A shorter side of the light-guiding-section is not more than 8 mm, and an area of the light-emitting-section is not less than 500 mm2. The light-emitting-section has the following features: (1) a ratio of min. luminance vs. max. luminance of is not less than 0.3; (2) an average luminance ranges from 1 cd/mto 200 cd/m, and (3) a change value in luminance per unit length is not more than (average luminance)×100 cd/m. Employing plural light-emitting-elements in the light source allows the lighting device to produce versatile colors. The light source, light-guide-board and a holder are structured and shaped in optimum way, so that unevenness in luminance of the device is reduced. An LCD unit incorporating this surface lighting device increases its display quality, and a portable terminal incorporating this LCD unit produces easy-to-lead display.