Research and Evaluation of Local Dimming Algorithm for LED Backlight LCD Display

Abstract:

Based on the further study on the dynamic dimming algorithms, the Inverse of Mapping Function (IMF) method, the error correction method and the cumulative distribution function (CDF) method are analyzed and applied to get the dimming level in the bottom-lit backlight. 50 typical images are simulated. The power reduction, contrast ratio enhancement, and MSSIM are explored to evaluate the 3 above dimming algorithms, the simulation results show that: IMF method does not apply to the low average luminance images; error correction method is suitable for a wide range of images, but the energy-saving rate is not high; though the energy-saving rate of the CDF method is higher than the other two kinds of algorithms, the image quality has a some kind of distortion.

• Periodical: Applied Mechanics and Materials (Volumes 321-324)
• Pages: 486-490
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.321-324.486
• Online since: June 2013
• Authors: Xi Tiao Zhang, Fen Liu, Guo Qiang Lv
• Keywords: Contrast Ratio, Liquid Crystal Display, Local Dimming, Mean Structural SIMilarity (MSSIM)

References

[1] Guoyou Gong: Dynamic LED Backlight Technology and Its Applications, Value Engineering, p.135, In Chinese.

[2] Zhonglian Qiao, Dongsheng Yang, Fei Liu: Design of Low Power LED Backlight Module for LCD TV, Chinese Journal of Liquid Crystals and Displays,Vol.26 No.4, Aug.2011, pp.455-458, In Chinese.

DOI: 10.3788/yjyxs20112604.0455

[3] Qibin Feng, Hao Tong, Guoqiang Lv: An Adaptive Global LED Backlight Dimming for Contra st Enhancement and Power Reduction, 2011, Journal of Solid State Phenomena,181-182.

DOI: 10.4028/www.scientific.net/ssp.181-182.241

[4] Qibin Feng, Huijie He, Weiwei Zhang, Yong Fang, Guoqiang Lv: Global dimming algorithm for side-lit LED backlight, Optics and Precision Engineering, Vol.20 No.7, Jul.2012, In Chinese.

[5] FUNAMOTO, KOBAYASHI T, MURAO T: High-picture-quality technique for LCD television: LCD-AI. Proc. International Display Workshop,2000:1157-1158.

[6] REMCO M J, LANGENDIJK E, VOSSEN F: Spatio-temporally consistent video processing for local backlight dimming .SID Digest,2007:979-982.

DOI: 10.1889/1.3069844

[7] SEETZEN H, HEIDRICH W, STUERZLINGER W: High dynamic range display systems .ACM Transactions on Graphics,2004:760-768.

DOI: 10.1145/1015706.1015797

[8] LIN F, LIAO C, LIAO L: Inverse of Mapping Function(IMF) method for image quality enhancement of high dynamic range LCD TVs

DOI: 10.1889/1.2785561

[9] Hyunsuk Cho, Oh-Kyong Kwon: A Backlight Dimming Algorithm for Low Power and High Image Quality LCD Applications, 2009 IEEE, 839-944

DOI: 10.1109/tce.2009.5174463

[10] Yanzhong Liu, Xueren Zheng, Jianbin Chen: Dynamic Backl ight Signal Extraction Algorithm Based on Threshold of Image CDF for LCD2TVand its Hardware Implementation, Chinese Journal of Liquid Crystals and Displays, Vol1 25 ,No1 3, J un. ,2010, pp.449-453, In Chinese.

[11] Zhou Wang, Alan Conrad Bovik, Hamid Rahim Sheikh, Eero P. Simoncelli: Image Quality Assessment: From Error Visibility to Structural Similarity, IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. 13, NO. 4, APRIL 2004, pp.600-612

DOI: 10.1109/tip.2003.819861