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. 16, 2013
Filed:
Apr. 30, 2010
Seung Kon Kong, Gyunggi-do, KR;
Jae Shin Lee, Gyunggi-do, KR;
Jung Hyun Kim, Gyunggi-do, KR;
Jung Sun Kwon, Gyunggi-do, KR;
BO Hyun Hwang, Seoul, KR;
Seung Kon Kong, Gyunggi-do, KR;
Jae Shin Lee, Gyunggi-do, KR;
Jung Hyun Kim, Gyunggi-do, KR;
Jung Sun Kwon, Gyunggi-do, KR;
Bo Hyun Hwang, Seoul, KR;
Abstract
An apparatus for driving a light emitting device (LED) is provided. The apparatus for driving the LED includes a first driving control element, a first current detection unit, a first effective value detection unit, a first reference signal generation unit, and a first comparison unit. The first driving control element controls a current flowing through a first LED channel, in response to a first pulse-width modulated control signal. The first current detection unit detects the current flowing through the first LED channel. The first effective value detection unit detects an effective value of the current detected by the first current detection unit. The first reference signal generation unit generates a preset reference signal having a sawtooth waveform. The first comparison unit compares the reference signal from the first reference signal generation unit with the effective value from the first effective value detection unit.