Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16015
Title: Color control system for RGB LED with application to light sources suffering from prolonged aging
Authors: Ng, SK
Loo, KH 
Lai, YM 
Tse, CK 
Keywords: CIE chromaticity diagram
color-sequential display
LED aging
LED driver
LED projector
light-emitting diode (LED)
multiprojector system
red, green, and blue (RGB) LED
Issue Date: 2014
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on industrial electronics, 2014, v. 61, no. 4, p. 1788-1798 How to cite?
Journal: IEEE transactions on industrial electronics 
Abstract: This paper presents a unified approach to controlling the white color point of the red/green/blue (RGB) light-emitting diode (LED) existing in all aging states. In contrast to conventional color control systems where the average driving currents of the primary-color LEDs can become saturated when the LEDs have undergone prolonged aging, which causes the resulting white color point to go out of regulation, the proposed method avoids this problem by adjusting the color set points when a predefined threshold current is reached by one or more of the primary-color LEDs. It is shown that the method can effectively maintain the white color point of RGB LED at the desired value when the primary-color LEDs are subjected to an accelerated aging through repetitive current stress cycles.
URI: http://hdl.handle.net/10397/16015
ISSN: 0278-0046
EISSN: 1557-9948
DOI: 10.1109/TIE.2013.2267696
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