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Optimal liquid crystal display backlight dimming based on clustered contrast loss

Authors
Kim, Jae-WooLee, Kyu-HoBae, Jin-GonKim, Hyung-GeunKim, Jong-Ok
Issue Date
10월-2015
Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
Keywords
liquid crystal display; backlight modulation; global dimming; clustered contrast loss; quality-power optimization
Citation
OPTICAL ENGINEERING, v.54, no.10
Indexed
SCIE
SCOPUS
Journal Title
OPTICAL ENGINEERING
Volume
54
Number
10
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/92345
DOI
10.1117/1.OE.54.10.103112
ISSN
0091-3286
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. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
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