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. 06, 2008
Filed:
Nov. 29, 2005
Wei-hsin Wei, Hsin-Chu, TW;
Shui-mu Lin, Taichung, TW;
Chien-sheng Chen, Maio-Li, TW;
Tsung-wei Huang, Taipei, TW;
Chin-chiang Yeh, Kaohsiung, TW;
Chin-tsung Chen, Taipei, TW;
Wei-Hsin Wei, Hsin-Chu, TW;
Shui-Mu Lin, Taichung, TW;
Chien-Sheng Chen, Maio-Li, TW;
Tsung-Wei Huang, Taipei, TW;
Chin-Chiang Yeh, Kaohsiung, TW;
Chin-Tsung Chen, Taipei, TW;
Richtek Technology Corp., Hsinchu Hsien, TW;
Abstract
A dimming method for LED driving circuit is proposed. By temporary switching a pin that is originally used for the input/output of other electric signals to a high impedance node, the dimming control signal may be inputted to dim LEDs. The dimming method comprises the steps of: floating the pin every a period of time to pull the pin's voltage being equal to the dimming control signal; detecting the pin's voltage; and retrieving the dimming control signal in accordance with the detected pin's voltage and thereafter dimming the LEDs.