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:
Feb. 03, 2015
Filed:
Jul. 22, 2011
Applicants:
Daniel Ladret, Lans en Vercors, FR;
Nawel Bouredji, La Fontanil, FR;
Inventors:
Daniel Ladret, Lans en Vercors, FR;
Nawel Bouredji, La Fontanil, FR;
Assignee:
St-Ericsson SA, Plan-les-Ouates, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 37/02 (2006.01); H05B 33/08 (2006.01); H02M 3/07 (2006.01);
U.S. Cl.
CPC ...
H05B 33/083 (2013.01); H05B 33/0815 (2013.01); H02M 2003/071 (2013.01);
Abstract
There is described a circuit for retro-lighting a display, comprising a group of white light-emitting diodes connected in series between a first node and a second node and a circuit for driving said group of series-coupled light-emitting diodes comprising: a power supply providing a positive voltage supplied to the first node; and a charge pump converter providing a negative voltage obtained from the positive voltage, said negative voltage being supplied to the second node.