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. 07, 2013
Filed:
Nov. 10, 2010
Shei-chie Yang, Wuri Township, Taichung County, TW;
Shui-mu Lin, Taichung, TW;
Chuan-yo Hsiao, Taipei, TW;
Huan-chien Yang, Yonghe, TW;
Shei-Chie Yang, Wuri Township, Taichung County, TW;
Shui-Mu Lin, Taichung, TW;
Chuan-Yo Hsiao, Taipei, TW;
Huan-Chien Yang, Yonghe, TW;
Richtek Technology Corporation, Hsin-Chu, TW;
Abstract
The present invention discloses an LED controller with de-flicker function and an LED de-flicker circuit and method thereof. The LED controller includes: a duty ratio calculation circuit for receiving a pulse width modulation (PWM) signal and generating a duty input signal, indicating a digital duty ratio of the PWM signal; an LED de-flicker circuit for receiving the duty input signal and generating a duty output signal wherein a noise in the duty input signal is filtered; and a dimming circuit for receiving the duty output signal and generating a dimming signal to control an LED circuit; wherein the duty output signal remains unchanged when the variation of the duty input signal is not larger than a hysteresis threshold, and the duty output signal follows the duty input signal when the variation of the duty input signal is larger than the hysteresis threshold.