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:
Mar. 23, 2010
Filed:
Jan. 24, 2007
Dong Woo Lee, Gyunggi-Do, KR;
Soo Ryong Hwang, Gyunggi-Do, KR;
Moo Youn Park, Gyunggi-Do, KR;
Samsung Electro-Mechanics Co., Ltd., Gyunggi-Do, KR;
Abstract
An LED driving apparatus having a temperature compensation function includes a reference voltage generator for generating a first reference voltage and a non-inversion amplification unit for performing non-inversion amplification to a difference voltage between the first reference voltage and a forward voltage with a preset gain. A driving unit adjusts a supply voltage in response to the voltage from the non-inversion amplification unit to supply the adjusted supply voltage to a light source having light emitting diodes. A forward voltage detector detects the forward voltage at an anode of the light emitting diodes of the light source to supply the forward voltage to the non-inversion amplification unit. Luminance variation can be compensated according to temperature changes by using a forward voltage of an LED light source so that the forward voltage of the LED light source can be controlled in association with a target current value of ambient temperature.