Title: High thermal stability of correlated color temperature using current compensation in hybrid warm white high-voltage LEDs
Authors: Chen, Kuo-Ju
Kuo, Hsuan-Ting
Chen, Hsin-Chu
Shih, Min-Hsiung
Wang, Chao-Hsun
Chien, Shih-Hsuan
Chiu, Sheng Huan
Lin, Chien-Chung
Pan, Ching-Jen
Kuo, Hao-Chung
Department of Photonics
Issue Date: 11-Mar-2013
Abstract: This study experimentally and numerically examines the correlated color temperature (CCT) stability issue for hybrid warm white high-voltage light-emitting diodes (HV-LEDs) by using a current compensation method. This method could efficiently maintain the CCT stability factor at approximately 1.0 and yield greater color uniformity with Delta u'v' values ranging from 0.017 to 0.003 in CIE 1976 chromaticity coordinates. The simulation results show that the red chip intensity drop is the primary cause of CCT instability in the hybrid warm white system when the temperature increases. Therefore, Furthermore, results indicate that the relative lumen drop improves from 21% to 15% by using a current compensation method. (c) 2013 Optical Society of America
URI: http://hdl.handle.net/11536/21388
ISSN: 1094-4087
Volume: 21
Issue: 5
Begin Page: A201
End Page: A207
Appears in Collections:Articles