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:
Nov. 04, 2008
Filed:
Sep. 27, 2006
Kazuo Nishinosono, Daito, JP;
Kazuo Nishinosono, Daito, JP;
Funai Electric Co., Ltd., Osaka, JP;
Abstract
This backlight light source drive device includes a plurality of backlight light source drive circuits which drive a plurality of respective backlight light sources, and a control circuit which turns those drive circuits ON and OFF. Each of the drive circuits includes a protection signal output circuit which, when its corresponding tube electrical current decreases, outputs to the control unit a protection signal for stopping the operation of all of the drive circuits. This protection signal output circuit includes an LED illumination circuit which, when the tube electrical current thus decreases, illuminates an LED to indicate the anomalous state, and an LED power supply circuit which always supplies power to the LED illumination circuit. And the control circuit stops the operation of all of the plurality of backlight light source drive circuits, when it receives a protection signal from any one or more of the protection signal output circuits.