IEICE Electronics Express
Online ISSN : 1349-2543
LETTER
An continuous-time LED dimming technique
Chun Wei LinBing Shiun HsiehYing Xu Tsai
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Keywords: LED, dimming, PWM, multilevel
JOURNALS FREE ACCESS

2013 Volume 10 Issue 4 Pages 20130070

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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.

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© 2013 by The Institute of Electronics, Information and Communication Engineers
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