Mr. Chia-Hung Wang Profile

Chia-Hung Wang

at National Chi Nan Univ

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Proceedings Article | 1 October 2009 Paper

A novel color mixing control system for light-emitting diodes

Chia-Hung Wang, Tai-Ping Sun

Proceedings Volume 7482, 74820K (2009) https://doi.org/10.1117/12.830303

KEYWORDS: Clocks, Light emitting diodes, Control systems, Modulators, Modulation, Logic, RGB color model, Power supplies, LCDs, Diodes

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This paper proposes a color mixing control system that provides adjustable color mixing using pulse-modulation light brightness period control while driving red-green-blue (RGB) light-emitting diodes (LED). The proposed control system includes a clock unit that provides a first clock signal and a second clock signal with a frequency lower than that of the first clock signal. Three control units are coupled to three LEDs emitting three different colors, respectively. Each control unit is operated based on the clock signals and a corresponding set of first and second reference values output to a driving pulse signal to the corresponding LED. Using four bit digital signal control, 4096 different colors and 16 gray levels can be provided by the digital pulse width modulator (DPWM) system. The system works using a single 5V power supply with a maximum clock frequency of 1MHz.

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