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:
Jul. 07, 2009
Filed:
Aug. 17, 2004
Akinori Hayafuji, Yonezawa, JP;
Katsuhiro Kanauchi, Yonezawa, JP;
Akinori Hayafuji, Yonezawa, JP;
Katsuhiro Kanauchi, Yonezawa, JP;
Tohoku Pioneer Corporation, Tendo-Shi, JP;
Abstract
Treating light emitting elementsin all the display pixels in a light emitting display panel as objects, a maximum value of the forward voltages is drawn by a multi-input comparatorand a peak hold circuit. Based on the maximum value of the forward voltages, a voltage boost circuitswitching operates a power FET to supply a boosted output by this operation to a constant current circuitas the operational voltage VH. In the case where the maximum value of the forward voltages increases due to trouble or the like and based on this increment the operational voltage VH excessively increases, the operation of the voltage boost circuitis stopped by a control output from an analog comparatorwhich functions as a voltage limiter.