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:
May. 10, 2011
Filed:
Oct. 20, 2008
Sang Cheol Shin, Gyunggi-Do, KR;
Byoung Own Min, Gyunggi-Do, KR;
Jung Chul Gong, Seoul, KR;
Yu Jin Jang, Gyunggi-Do, KR;
Seung Kon Kong, Gyunggi-Do, KR;
Sang Cheol Shin, Gyunggi-Do, KR;
Byoung Own Min, Gyunggi-Do, KR;
Jung Chul Gong, Seoul, KR;
Yu Jin Jang, Gyunggi-Do, KR;
Seung Kon Kong, Gyunggi-Do, KR;
Samsung Electro-Mechanics Co., Ltd., Gyunggi-do, KR;
Abstract
Provided is an apparatus for driving a light emitting element. The apparatus includes a power unit, a light emitting element array, a constant-current circuit unit, and a voltage limiting circuit unit. The power unit supplies driving power. The light emitting element array includes a plurality of light emitting elements connected in series between an anode terminal connected to the power unit and a cathode terminal. The constant-current circuit unit maintains a constant current flowing through the light emitting element array according to a first tuning voltage. The voltage limiting circuit unit is connected between the cathode terminal of the light emitting element array and the constant-current circuit unit, and divides a total voltage applied between the cathode terminal of the light emitting element array and a ground according to a second tuning voltage to limit a voltage applied to the constant-current circuit unit below a predetermined voltage.