Dynamic Backlight Gamma on High Dynamic Range LCD TVs

A high dynamic range liquid crystal display (HDR-LCD) can enhance the contrast ratio of images by utilizing locally controlled dynamic backlight. We studied the HDR-LCD as a dual-panel display: a backlight module and a liquid crystal (LC) cell. As the gamma of the LC signal, the backlight module was...

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Bibliographic Details
Published in:Journal of display technology 2008-06, Vol.4 (2), p.139-146
Main Authors: Fang-Cheng Lin, Yi-Pai Huang, Lin-Yao Liao, Cheng-Yu Liao, Shieh, H.-P.D., Te-Mei Wang, Szu-Che Yeh
Format: Article
Language:English
Subjects:
Backlight determination
Backlights
Brightness
Chromium
contrast ratio
dual- panel
dynamic backlight
Dynamic range
Dynamics
high dynamic range (HDR)
Image contrast
Image quality
Image resolution
Liquid crystal displays
Liquid crystals
Mapping
Modules
Signal mapping
Signal resolution
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Summary:A high dynamic range liquid crystal display (HDR-LCD) can enhance the contrast ratio of images by utilizing locally controlled dynamic backlight. We studied the HDR-LCD as a dual-panel display: a backlight module and a liquid crystal (LC) cell. As the gamma of the LC signal, the backlight module was also endowed with a gamma function to control the contrast ratio of HDR images. The inverse of a mapping function (IMF) method proposed as a dynamic gamma mapping curve for the backlight module, has been demonstrated to further improve in HDR image quality. By implementing the IMF method on a HDR-LCD TV with 88 backlight zones, the image contrast ratio can reach while maintaining high brightness, clear image detail, and an average power reduction of 30%.
ISSN:1551-319X
1558-9323
DOI:10.1109/JDT.2008.920175