Design and evaluation of light spread function for area-adaptive LCD system

Yu Kuo Cheng*, Yen Hsing Lu, Chung-Hao Tien, Han Ping Shieh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


A methodology, based on two-dimensional super-Gaussian light spread functions (LSFs), was studied for the light-emitting-diode (LED) backlighting system in the high dynamic range (HDR) liquid crystal displays (LCDs). We proposed a novel LED-based optomechanical configuration to implement the desirable luminous pattern. A dual-liquid-crystal-panel system was constructed as a pseudo-HDR LCD to evaluate the super-Gaussian illumination. The proposed HDR scheme was verified via the current platform: overall luminance uniformity, contrast ratio and processing speed could be improved by factors of 1.55, 1.95-4.15, and 4.82, respectively. The design flexibility made the methodology applicable to any panel dimension and backlight division of the HDR LCDs, and to the conventional full-on backlighting LCDs as well.

Original languageEnglish
Article number4770609
Pages (from-to)66-71
Number of pages6
JournalIEEE/OSA Journal of Display Technology
Issue number2
StatePublished - 1 Feb 2009


  • High dynamic range liquid crystal display (HDR LCD)
  • Light spread function (LSF)
  • Local-dimming backlight

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