A study of controlling color mixing of red, green, and blue leds based on photometry theory

Shinn Fwu Wang, Hung Chen Chung, Tsung Hsun Yang, An Li Liu, Yuan Fong Chau, Jeng Hua Wei, Chiung Chou Liao

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A method of controlling color mixing of red, green, and blue LEDs based on photometry theory is presented. The (x, y) chromaticity coordinate can be acquired while the ratio of duty cycle signal is changed. It can achieve color mixing of RGB LEDs by pulse width modulation (PWM) control circuit sending duty cycle signal to LED driver. In this paper, the variations in chromaticity coordinates by controlling color mixing of red, green, and blue LEDs based on photometry theory will be discussed. From the experimental results, it is evident that the chromaticity coordinate variations Δuv of red, green, and blue LEDs are less than 0.0071, 0.0105, and 0.0110, respectively. Besides, A/D converters and microcontroller is used to implement the feedback control mechanism and the front panel of LabVIEW program is used for the development of the control algorithm. However, it is clear that the experimental results and the theoretical data are in good correspondence.

Original languageEnglish
Pages (from-to)1056-1062
Number of pages7
JournalSensor Letters
Volume10
Issue number5-6
DOIs
StatePublished - May 2012

Keywords

  • Color Gamut
  • Color Mixing
  • Duty Cycle
  • Photometry Theory
  • Pulse Width Modulation (PWM)

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