Dynamic dimming algorithm in side-lit LED backlights

XIANG Yan; FENG Qi-bin; LV Guo-qiang

doi:10.3788/YJYXS20142902.0293

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Dynamic dimming algorithm in side-lit LED backlights

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- Dynamic dimming algorithm in side-lit LED backlights
- Chinese Journal of Liquid Crystals and Displays Vol. 29, Issue 2, Pages: 293-297(2014)
- 作者机构：
  
  1. 合肥工业大学光电技术研究院,安徽合肥,230009
  2. 中航华东光电有限公司,安徽芜湖,241002
  3. 合肥工业大学特种显示技术教育部重点实验室, 特种显示技术国家工程实验室, 现代显示技术省部共建国家重点实验室,安徽合肥,230009
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20142902.0293
  CLC： TN27
- Received：24 November 2013，
  
  Revised：11 December 2013，
  
  Published：05 March 2014
- 稿件说明：
移动端阅览
向艳, 冯奇斌, 吕国强. 侧出LED背光动态调光算法研究[J]. 液晶与显示, 2014,29(2): 293-297

XIANG Yan, FENG Qi-bin, LV Guo-qiang. Dynamic dimming algorithm in side-lit LED backlights[J]. , 2014,29(2): 293-297
向艳, 冯奇斌, 吕国强. 侧出LED背光动态调光算法研究[J]. 液晶与显示, 2014,29(2): 293-297 DOI： 10.3788/YJYXS20142902.0293.

XIANG Yan, FENG Qi-bin, LV Guo-qiang. Dynamic dimming algorithm in side-lit LED backlights[J]. , 2014,29(2): 293-297 DOI： 10.3788/YJYXS20142902.0293.

摘要

液晶显示具有对比度和能效不高的问题。动态调光可以有效提高液晶显示对比度并降低能耗。针对市场主流背光产品，提出了用于侧出式背光的全局调光算法。根据图像特征值，确定背光调光亮度。根据S曲线方程，对液晶像素进行补偿，高于S曲线拐点的像素亮度值增加，低于拐点的亮度值减少，有效提高静态对比度。最后进行了软件仿真，并开发了工程化样机。播放包括常见电视内容的视频，平均节能率为17%，没有人眼感知的失真。

Abstract

Liquid crystal displays have two shortcomings of low CR and power efficiency. Dynamic dimming can help LCD to achieve high contrast ratio and reduce power consumption. Aimed at main-stream backlight products

the paper proposes a global dimming algorithm. The dimming level of the backlight and S-shaped curve are determined based on the characteristic parameters of an input image. The pixels with higher grayscales become brighter and the pixels with smaller grayscales become darker

which improves contrast efficiently.The engineering prototype is developed. When displaying the video consisting different contents common on TVs

the average power reduction ratio reaches 17%. There are no human perceived distortions.

关键词

Keywords

references

Engelsen D, 童林夙. 背光源的发展趋势[J]. 光电子技术, 2006, 26(2):74-80. Engelsen D, Tong L S. Trends of backlights[J].Journal of Opto-Electronic Technology, 2006, 26(2):74-80.(in Chinese)[2] Wu S C.Next generation LCD technology[J].Journal of Information Display, 2010, 26(1): 3-4.[3] Cho H, Kwon O K.A backlight dimming algorithm for low power and high image quality LCD applications[J].IEEE Transactions on Consumer Electronics, 2009, 55(2): 839-844.[4] Huang M H, Tsai Y C, Chen K H. Energy-recycling (ER) technique for a direct-Lit intelligent power management backlight unit (BLU)[J].IEEE Transactions on Power Electronics, 2010, 25(10): 2588-2598.[5] Chiu T L, Lee J H.Color gamut variation of LED-lit LCD at different module temperatures[J].Optics Communications, 2010, 283:373-378.[6] 冯奇斌, 何会杰, 张伟伟, 等. 用于侧出式发光二极管背光的全局动态调光算法[J]. 光学精密工程, 2012, 20(7):1455-1462. Feng Q B, He H J, Zhang W W, et al.Global dimming algorithm for side-lit LED backlights[J].Journal of Optics and Precision Engineering, 2012, 20(7):1455-1462. (in Chinese)[7] Lai C C, Tsai C C. Backlight power reduction and image contrast enhancement using adaptive dimming for global backlight applications[J].IEEE Transaction on Consumer Electron, 2008, 54(2):669-674.[8] Feng Q B, Tong H, Lv G Q. An adaptive global LED backlight dimming for contrast enhancement and power reduction[J].Journal of Solid State Phenomena, 2011, 181:241-244.[9] Kang S J, Kim Y H. Multi-histogram-based backlight dimming for low power liquid crystal displays[J].Journal of Display Technology, 2011, 7(10):544-549.[10] Kang S J, Kim Y H. Image integrity-based gray-level error control for low power liquid crystal displays[J].IEEE Transactions on Consumer Electronics, 2009, 55(4):2401-2406.[11] Cho H, Kwon O K. A local dimming algorithm for low power LCD TVs using edge-type LED backlight[J].IEEE Transactions on Consumer Electronics, 2010, 56(4):2054-2060.

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Related Institution

Key Laboratory of Special Display Technology of the Ministry of Education, National Engineering Laboratory of Special Display Technology, National Key Laboratory of Advanced Display Technology, Hefei University of Technology

School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology

School of Computer and Information, Hefei University of Technology

State Key Laboratory of Luminescent Materials and Device, Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology

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