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。

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.