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:
Jan. 04, 2011
Filed:
Jul. 10, 2006
Makoto Tanahashi, Kanagawa, JP;
Kiyohito Fujita, Kanagawa, JP;
Makoto Tanahashi, Kanagawa, JP;
Kiyohito Fujita, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A display device includes a light source device and an image display panel operable to display an image using light emitted from the light source device. The light source device includes a plurality of series drive circuits each including a predetermined number of series-connected light-emitting diodes, a constant-current circuit outputting a constant amount of current to one of the plural series drive circuits serving as a reference, the plural series drive circuits being connected in parallel with the current output, a current mirror circuit operable to allow the same amount of current to flow through the plural series drive circuits, and a voltage dropping circuit operable to cause a voltage drop of a predetermined level in the series drive circuit serving as the reference, the voltage dropping circuit being disposed in series with the light-emitting diodes forming the series drive circuit serving as the reference.