Evaluation method for dynamic dimming algorithms in LED backlights

FANG Xu-dong; LI Ya-ni; FENG Qing-gang; SHI Zu-chuan; FENG Qi-bin

doi:10.3788/YJYXS20142906.1096

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Evaluation method for dynamic dimming algorithms in LED backlights

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- Evaluation method for dynamic dimming algorithms in LED backlights
- Chinese Journal of Liquid Crystals and Displays Vol. 29, Issue 6, Pages: 1096-1100(2014)
- 作者机构：
  
  1. 合肥京东方显示光源有限公司,安徽合肥,230012
  2. 合肥工业大学光电技术研究院, 安徽合肥 230009
  3. 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/YJYXS20142906.1096
  CLC： TN27
- Received：20 June 2014，
  
  Revised：14 July 2014，
  
  Published Online：30 July 2014，
  
  Published：05 December 2014
- 稿件说明：
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方旭东, 李亚妮, 冯庆刚, 施祖传, 冯奇斌. LED背光动态调光算法评估方法研究[J]. 液晶与显示, 2014,29(6): 1096-1100

FANG Xu-dong, LI Ya-ni, FENG Qing-gang, SHI Zu-chuan, FENG Qi-bin. Evaluation method for dynamic dimming algorithms in LED backlights[J]. , 2014,29(6): 1096-1100
方旭东, 李亚妮, 冯庆刚, 施祖传, 冯奇斌. LED背光动态调光算法评估方法研究[J]. 液晶与显示, 2014,29(6): 1096-1100 DOI： 10.3788/YJYXS20142906.1096.

FANG Xu-dong, LI Ya-ni, FENG Qing-gang, SHI Zu-chuan, FENG Qi-bin. Evaluation method for dynamic dimming algorithms in LED backlights[J]. , 2014,29(6): 1096-1100 DOI： 10.3788/YJYXS20142906.1096.

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，降低能耗。对调光算法进行显示效果和节能率的综合评估才能有效降低该技术的开发风险，进行有针对性的改进和优化。目前尚没有统一的评估方法。本文介绍了现有的主流调光算法，结合峰值信噪比、结构相似性、互相关3个参数，提出评价显示效果的显示效果指数。综合节能率，提出平衡显示效果和节能率的调光效果指数。选取了6类不同亮度和对比度的图像对多种调光算法计算了调光效果指数，分析了各类算法的适用性。

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. The evaluation method balancing display effects after dimming and power-saving ratio can efficiently reduce the deve-lopment risk. Until now there is no agreed evaluation method. Combining three parameters of peak signal-to-noise ratio

structural similarity index measurement

and mutual information

the display effect index is proposed to evaluate the display effect after dimming. The dimming effect index is then introduced to balance the power-saving and display effect. The images belonging to six classifications of different luminance and contrast ratio are used to make the evaluation on several mainstream dimming algorithms. Based on the dimming effect index

the most suitable applications of the dimming algorithms are analyzed.

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references

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