Title :
A dimming technique for light emitting diode
Author :
Chun Wei Lin ; Bing Shiun Hsieh ; Ying Xu Tsai
Author_Institution :
Dept. of Electron. Eng., Nat. Yunlin Univ. of Sci. & Technol., Yunlin, Taiwan
Abstract :
This paper presents a dimming technique for light emitting diode (LED), which improves the resolution of luminous intensity, luminous efficiency and extends the life of device. The presented method quantifies corresponding variation from light sensor into binary representation by a pulse width modulator (PWM) and multilevel generator. After that, a digital filter is further used to perform interpolation on converted binary codes enhancing the length of signal. Through controlling the binary-weighted current regulation, the presented method provides 8-bit resolution on adjusting luminous intensity. The minimum current variation is less than 0.5% of maximum current delivery.
Keywords :
binary codes; digital filters; electric current control; interpolation; light emitting diodes; LED; PWM; binary representation; binary-weighted current regulation control; converted binary codes; current delivery; current variation; device life extension; digital filter; dimming technique; interpolation; light emitting diode; light sensor; luminous efficiency; luminous intensity resolution; multilevel generator; pulse width modulator; signal length enhancement; Current control; Digital filters; Generators; Interpolation; Light emitting diodes; Lighting; Pulse width modulation; LED; PWM; dimming; multilevel;
Conference_Titel :
Electron Devices and Solid State Circuit (EDSSC), 2012 IEEE International Conference on
Conference_Location :
Bangkok
Print_ISBN :
978-1-4673-5694-7
DOI :
10.1109/EDSSC.2012.6482824
