1 Scopus citations


Light emitting diodes (LEDs) offer durability, long life, and high efficiency that make them an excellent alternative for illumination applications. The efficiency of conventional drivers suffers from losses due to the current sensing method that they employ. In this paper, the LED array itself is used as an optical sensor by periodically measuring neighboring cells' light intensity, instead of employing the commonly used series current-sense resistor. The results of this approach show that it provides accurate compensation of the LED characteristics, with less than one lumen variation in illumination, stability in color (color shift over time as low as ΔE = 0.76), and efficiency of up to 98.66%. The proposed sensor compensates for actual optical performance of the LED array and reduces aging effects compared to the approaches based in current measurement and control. The optical current-sensing method is a closed-loop feedback alternative, which improves the power efficiency of the LED driver by 3%. It maintains constant output illumination of the LED over time, and it utilizes a reduced number of components, thus extending the effective lifetime of LED-based devices.

Original languageEnglish (US)
Title of host publicationThirteenth International Conference on Solid State Lighting
EditorsJianzhong Jiao, Matthew H. Kane, Nikolaus Dietz, Jian-Jang Huang
ISBN (Electronic)9781628412178
StatePublished - Jan 1 2014
Event13th International Conference on Solid State Lighting - San Diego, United States
Duration: Aug 20 2014Aug 21 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Other13th International Conference on Solid State Lighting
Country/TerritoryUnited States
CitySan Diego


  • Light emitting diode (LED)
  • Photo-detectors
  • Pulse width modulation (PWM)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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