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:
Apr. 04, 2006
Filed:
Mar. 15, 2004
Motoyasu Yano, Kanagawa, JP;
Yuichi Takagi, Kanagawa, JP;
Yoshihiro Komatsu, Kanagawa, JP;
Mitsuru Suzuki, Kanagawa, JP;
Masataka Kawase, Kanagawa, JP;
Motoyasu Yano, Kanagawa, JP;
Yuichi Takagi, Kanagawa, JP;
Yoshihiro Komatsu, Kanagawa, JP;
Mitsuru Suzuki, Kanagawa, JP;
Masataka Kawase, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
A defect detection of light-emitting diodes (LEDs) is electrically performed on a large-scale display, comprising a plurality of light-emitting diodes arranged by a predetermined arrangement on an image display face, voltage detection portions for applying a constant current to a plurality of light-emitting diodes in an off region at a forward voltage or less in accordance with an input of a signal indicating a defect detection mode and detecting voltages between terminals of light-emitting diodes arising when the constant current flows there through, and a defect detection portion for electrically detecting a defect from the plurality of light-emitting diodes based on detection results of the voltage detection portion; and drive circuit devices (driver ICs) having the above configuration are serially connected and an electric signal indicating a result of defect detection is output from its final stage.