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

doi:10.1166/sl.2012.2301

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

Department of Optics and Photonics

Research output: Contribution to journal › Article › peer-review

5 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 language	English
Pages (from-to)	1056-1062
Number of pages	7
Journal	Sensor Letters
Volume	10
Issue number	5-6
DOIs	https://doi.org/10.1166/sl.2012.2301
State	Published - May 2012

Keywords

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

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10.1166/sl.2012.2301

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

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.",

keywords = "Color Gamut, Color Mixing, Duty Cycle, Photometry Theory, Pulse Width Modulation (PWM)",

author = "Wang, {Shinn Fwu} and Chung, {Hung Chen} and Yang, {Tsung Hsun} and Liu, {An Li} and Chau, {Yuan Fong} and Wei, {Jeng Hua} and Liao, {Chiung Chou}",

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AU - Wang, Shinn Fwu

AU - Chung, Hung Chen

AU - Yang, Tsung Hsun

AU - Liu, An Li

AU - Chau, Yuan Fong

AU - Wei, Jeng Hua

AU - Liao, Chiung Chou

PY - 2012/5

Y1 - 2012/5

N2 - 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.

AB - 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.

KW - Color Gamut

KW - Color Mixing

KW - Duty Cycle

KW - Photometry Theory

KW - Pulse Width Modulation (PWM)

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JO - Sensor Letters

JF - Sensor Letters

IS - 5-6

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

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Keywords

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