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, 2014
Filed:
Dec. 08, 2011
Go Takata, Hyogo, JP;
Shinichiro Kataoka, Osaka, JP;
Yasunori Yamamoto, Osaka, JP;
Tsukasa Kawahara, Kyoto, JP;
Ryuji Ueda, Osaka, JP;
Daisuke Itou, Osaka, JP;
Go Takata, Hyogo, JP;
Shinichiro Kataoka, Osaka, JP;
Yasunori Yamamoto, Osaka, JP;
Tsukasa Kawahara, Kyoto, JP;
Ryuji Ueda, Osaka, JP;
Daisuke Itou, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Short circuit failures and open circuit failures of light-emitting elements used for the backlight in an LCD panel can be reliably and easily detected. The voltage at the node between each series-connected light-emitting element array and a drive circuit is detected as a monitored voltage. A maximum detector detects the highest and a minimum detector detects the lowest of these monitored voltages. Short circuit or open circuit failure of a light-emitting element is detected by comparing the voltage difference between the maximum detector output and the minimum detector output with a specific reference voltage.