Sequential Variable Bilevel Driving Approach Suitable for Use in High-Color-Precision LED Display Panels

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • S. K. Ng
  • K. H. Loo
  • S. K. Ip
  • Y. M. Lai
  • K. T. Mok

Detail(s)

Original languageEnglish
Article number6109345
Pages (from-to)4637-4645
Journal / PublicationIEEE Transactions on Industrial Electronics
Volume59
Issue number12
Online published20 Dec 2011
Publication statusPublished - Dec 2012
Externally publishedYes

Abstract

A bilevel driving approach was proposed in the literature for mitigating the energy wastage associated with driving LEDs at high peak current. The main idea is to introduce two drive parameters, i.e., high/low PWM current levels and duty cycles, that give rise to a 2-D luminosity control capability. The same idea was later generalized to an $n$-level driving approach for maximizing the electrical-to-light conversion efficiency of LEDs. Although previous uses of the $n$-level driving approach have been focusing on improving the luminous efficacy of LEDs, it is shown in this paper that its 2-D luminosity control feature can also lead to a significant improvement in color resolution when applied to driving RGB LEDs, hence making it well suited for applications in large-area LED display panels. In comparison to the first prototype driver proposed by the inventor of the driving approach, a more practical implementation of the complex 2-D driving approach with digital microcontroller is demonstrated. The various technical aspects of the driving approach, including luminous efficacy, color resolution, and color stability over dimming, are discussed in this paper with the aid of experimental results. © 2011 IEEE.

Research Area(s)

  • Bilevel current, light-emitting diode (LED) driver, light-emitting diode (LED), RGB LED, sequential driving

Citation Format(s)

Sequential Variable Bilevel Driving Approach Suitable for Use in High-Color-Precision LED Display Panels. / Ng, S. K.; Loo, K. H.; Ip, S. K.; Lai, Y. M.; Tse, Chi K.; Mok, K. T.

In: IEEE Transactions on Industrial Electronics, Vol. 59, No. 12, 6109345, 12.2012, p. 4637-4645.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review