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Article: Stationary and adaptive color-shift reduction methods based on the bilevel driving technique for phosphor-converted white LEDs

TitleStationary and adaptive color-shift reduction methods based on the bilevel driving technique for phosphor-converted white LEDs
Authors
KeywordsColor Control
Driving Method
LED Color
Light-Emitting Diode (LED)
White LED
Issue Date2011
Citation
IEEE Transactions on Power Electronics, 2011, v. 26 n. 7, p. 1943-1953 How to Cite?
AbstractThe bilevel driving technique has realized a 2-D control of the luminosity and emitted color of white LEDs with duty cycle and forward current levels. Unfortunately, various combinations of these dimming control parameters can lead to significant changes in junction temperature, which further modify the luminosity and emitted color of LEDs. In this paper, the theoretical aspects of these complex interactions and the impact of bilevel drive on the color-shift properties of white LEDs are discussed in detail by using a mathematical color-shift model. Two color-shift reduction methods are proposed based on the insights obtained from this model. This study shows that a heat sinks thermal resistance that minimizes the overall color shift over dimming can be uniquely determined from the knowledge of some measurable LED parameters, and gives rise to a global minimum color shift. If such a thermal resistance cannot be realized due to practical limitations, the second method that utilizes an adaptive change of forward current levels over dimming can be adopted. Based on their nature, these methods are classified as stationary and adaptive methods, respectively. Their validity is supported by experimental measurements on a commercial white LED. © 2011 IEEE.
Persistent Identifierhttp://hdl.handle.net/10722/155641
ISSN
2015 Impact Factor: 4.953
2015 SCImago Journal Rankings: 3.005
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLoo, KHen_US
dc.contributor.authorLai, YMen_US
dc.contributor.authorTan, SCen_US
dc.contributor.authorTse, CKen_US
dc.date.accessioned2012-08-08T08:34:37Z-
dc.date.available2012-08-08T08:34:37Z-
dc.date.issued2011en_US
dc.identifier.citationIEEE Transactions on Power Electronics, 2011, v. 26 n. 7, p. 1943-1953en_US
dc.identifier.issn0885-8993en_US
dc.identifier.urihttp://hdl.handle.net/10722/155641-
dc.description.abstractThe bilevel driving technique has realized a 2-D control of the luminosity and emitted color of white LEDs with duty cycle and forward current levels. Unfortunately, various combinations of these dimming control parameters can lead to significant changes in junction temperature, which further modify the luminosity and emitted color of LEDs. In this paper, the theoretical aspects of these complex interactions and the impact of bilevel drive on the color-shift properties of white LEDs are discussed in detail by using a mathematical color-shift model. Two color-shift reduction methods are proposed based on the insights obtained from this model. This study shows that a heat sinks thermal resistance that minimizes the overall color shift over dimming can be uniquely determined from the knowledge of some measurable LED parameters, and gives rise to a global minimum color shift. If such a thermal resistance cannot be realized due to practical limitations, the second method that utilizes an adaptive change of forward current levels over dimming can be adopted. Based on their nature, these methods are classified as stationary and adaptive methods, respectively. Their validity is supported by experimental measurements on a commercial white LED. © 2011 IEEE.en_US
dc.languageengen_US
dc.relation.ispartofIEEE Transactions on Power Electronicsen_US
dc.rights©2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsIEEE Transactions on Power Electronics. Copyright © IEEE-
dc.subjectColor Controlen_US
dc.subjectDriving Methoden_US
dc.subjectLED Coloren_US
dc.subjectLight-Emitting Diode (LED)en_US
dc.subjectWhite LEDen_US
dc.titleStationary and adaptive color-shift reduction methods based on the bilevel driving technique for phosphor-converted white LEDsen_US
dc.typeArticleen_US
dc.identifier.emailTan, SC:sctan@hku.hken_US
dc.identifier.authorityTan, SC=rp01606en_US
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1109/TPEL.2010.2097610en_US
dc.identifier.scopuseid_2-s2.0-80051674442en_US
dc.identifier.hkuros205681-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80051674442&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume26en_US
dc.identifier.issue7en_US
dc.identifier.spage1943en_US
dc.identifier.epage1953en_US
dc.identifier.isiWOS:000293751000015-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridLoo, KH=7003558724en_US
dc.identifier.scopusauthoridLai, YM=7401512093en_US
dc.identifier.scopusauthoridTan, SC=26642772000en_US
dc.identifier.scopusauthoridTse, CK=7103295097en_US

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