An Optimized Backlight Local Dimming Algorithm for Edge-Lit LED Backlight LCDs

Seungwook Cha, Taehyeon Choi, Hoonjae Lee, Sanghoon Sull

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


This paper presents an efficient optimized backlight local dimming method that minimizes power consumption under a given allowable distortion for liquid crystal displays with edge-lit light-emitting diode backlight. To reduce image quality fluctuation, an inequality constraint optimization problem is formulated using a given allowable distortion and the steepest descent method is used to solve the optimization problem. The experimental results show that the proposed method has better performance than previous methods at the same average power consumption in the unnoticeable level of the difference between the displayed images before and after dimming. Also, the proposed method reduces the risk of large performance degradation and reduces computation time by three times compared with the existing optimization based methods.

Original languageEnglish
Article number7036042
Pages (from-to)378-385
Number of pages8
JournalJournal of Display Technology
Issue number4
Publication statusPublished - 2015 Apr 1

Bibliographical note

Publisher Copyright:
© 2005-2012 IEEE.


  • Light-emitting diode (LED) backlight
  • light spread function (LSF)
  • liquid crystal display (LCD)
  • local dimming
  • optimization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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