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

fYear

2012

Firstpage

1

Lastpage

3

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices and Solid State Circuit (EDSSC), 2012 IEEE International Conference on

Conference_Location

Bangkok

Print_ISBN

978-1-4673-5694-7

Type

conf

DOI

10.1109/EDSSC.2012.6482824

Filename

6482824