Subjective comparison of brightness preservation methods for local backlight dimming displays

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    Local backlight dimming is a popular technology in high quality Liquid Crystal Displays (LCDs). In those displays, the backlight is composed of contributions from several individually adjustable backlight segments, set at different backlight luminance levels in different parts of the screen, according to the luma of the target image displayed on LCD. Typically, transmittance of the liquid crystal cells (pixels) located in the regions with dimmed backlight is increased in order to preserve their relative brightness with respect to the pixels located in the regions with bright backlight. There are different methods for brightness preservation for local backlight dimming displays, producing images with different visual characteristics. In this study, we have implemented, analyzed and evaluated several different approaches for brightness preservation, and conducted a subjective study based on rank ordering to compare the relevant methods on a real-life LCD with a local backlight dimming capability. In general, our results show that locally adapted brightness preservation methods produce more preferred visual outcome than global methods, but dependency on the content is also observed. Based on the results, guidelines for selecting the perceptually preferred brightness preservation method for local backlight dimming displays are outlined.
    Original languageEnglish
    Title of host publicationProceedings of the SPIE
    Number of pages12
    PublisherSPIE - International Society for Optical Engineering
    Publication date2015
    Article number939504
    Publication statusPublished - 2015
    EventColor Imaging XX: Displaying, Processing, Hardcopy, and Applications - Hilton San Francisco, Union Square, San Francisco, United States
    Duration: 8 Feb 201512 Feb 2015


    ConferenceColor Imaging XX
    LocationHilton San Francisco, Union Square
    Country/TerritoryUnited States
    CitySan Francisco
    SeriesProceedings of SPIE - The International Society for Optical Engineering

    Bibliographical note

    Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


    • Displays
    • Local backlight dimming
    • Image processing
    • Image quality
    • Visual effects


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