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. 10, 2012
Filed:
Dec. 01, 2009
Kuo-ching Hsu, Hsinchu, TW;
Chin-hsun Hsu, Taipei County, TW;
Tsung-hau Chang, Hsinchu, TW;
Ting-wei Liao, Taipei County, TW;
Kuo-Ching Hsu, Hsinchu, TW;
Chin-Hsun Hsu, Taipei County, TW;
Tsung-Hau Chang, Hsinchu, TW;
Ting-Wei Liao, Taipei County, TW;
Novatek Microelectronics Corp., Hsinchu, TW;
Abstract
A driving apparatus of a light emitting diode (LED) and a driving method thereof are provided. In the driving method, when the driving apparatus performs dimming and a duty cycle of a dimming signal is smaller than a predetermination value, outputting time of driving currents are equally allotted in a period, and a magnitude of each driving current is regulated correspondingly. When the driving apparatus performs dimming and the duty cycle of the dimming signal is equal to or greater than the predetermination value, the driving currents are simultaneously output in the period, and the magnitude of each driving current is regulated according to the dimming signal. Therefore, an audio noise and an electromagnetic interference caused by excessive variation of a sum of the driving currents are suppressed.