US 6,982,527 B2
Method for driving light emitting diode
Albert Minru Lee, Taipei (Taiwan); and Wei Wen Feng, Taipei (Taiwan)
Assigned to Analog Integrations Corporation, Hsinchu (Taiwan)
Filed on May 12, 2004, as Appl. No. 10/844,956.
Claims priority of application No. 92119602 A (TW), filed on Jul. 17, 2003.
Prior Publication US 2005/0023992 A1, Feb. 03, 2005
Int. Cl. H05B 37/02 (2006.01)
U.S. Cl. 315—224 20 Claims
OG exemplary drawing
 
1. A method for driving a light emitting diode coupled to an output of a current mirror, comprising steps of:
providing a control terminal voltage of said current mirror as a reference voltage;
increasing a voltage of an input of said current mirror and providing an input of said light emitting diode as a voltage feedback point for keeping a constant voltage difference between said input and said output of said current mirror; and
driving said light emitting diode by a voltage at said output of said current mirror.