Optimal liquid crystal display backlight dimming based on clustered contrast loss

Jae Woo Kim, Kyu Ho Lee, Jin Gon Bae, Hyung Geun Kim, Jong-Ok Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We propose an image adaptive backlight dimming method that quantitatively measures the perceived image quality degradation in terms of brightness and contrast. Unlike conventional methods, the proposed adaptive dimming considers the spatial distribution characteristics of the clipped pixels via a new measure, clusterization, to effectively estimate the perceived contrast loss and prevent the clipping artifact (light saturation). The proposed adaptive dimming achieves an average 17.71% power reduction while keeping the image quality difference to a tolerably low amount, as shown by the subjective mean opinion score test results. Comparing the optimal backlight levels estimated by the proposed method with results from other methods, the proposed backlight dimming is closer to the ground truth backlight levels that are favored by human subjects.

Original languageEnglish
Article number103112
JournalOptical Engineering
Volume54
Issue number10
DOIs
Publication statusPublished - 2015 Oct 1

Fingerprint

dimming
Liquid crystal displays
Image quality
Dimming (lamps)
liquid crystals
Spatial distribution
Luminance
Pixels
Degradation
ground truth
artifacts
spatial distribution
brightness
pixels
degradation
saturation
estimates

Keywords

  • backlight modulation
  • clustered contrast loss
  • global dimming
  • liquid crystal display
  • quality-power optimization

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

Cite this

Optimal liquid crystal display backlight dimming based on clustered contrast loss. / Kim, Jae Woo; Lee, Kyu Ho; Bae, Jin Gon; Kim, Hyung Geun; Kim, Jong-Ok.

In: Optical Engineering, Vol. 54, No. 10, 103112, 01.10.2015.

Research output: Contribution to journalArticle

Kim, Jae Woo ; Lee, Kyu Ho ; Bae, Jin Gon ; Kim, Hyung Geun ; Kim, Jong-Ok. / Optimal liquid crystal display backlight dimming based on clustered contrast loss. In: Optical Engineering. 2015 ; Vol. 54, No. 10.
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