基于心理感受等值点的大屏对比度研究

Research on the Ctrast Rtio of Lrge Sreen from the Vew of Euivalence Point

目的 针对智慧大屏的文字背景对比度设计,讨论在不同观察距离、字号和对比度极性下大屏的对比度标准。方法 实验为29(对比度水平)*2(观察距离)*2(字号)*2(对比度极性)的组内设计,因变量为被试的清晰度评分。实验共23位被试参与。结果 与移动端相比,大屏端的对比度标准更高。观察距离和对比度极性均对大屏对比度标准产生影响。观察距离越远,对比度标准越高;与正极性相比,负极性对比度标准更高。3米观察距离下,负极性文本的最小对比度不低于6.5,加强对比度不低于10;正极性文本的最小对比度不低于6,加强对比度不低于9.7米观察距离下,负极性文本的最小对比度不低于8.5,加强对比度不低于12.5;正极性文本的最小对比度不低于6.5,加强对比度不低于9.5。结论 结果可用于指导大屏端的文本背景对比度设计。

Objective Targeted at the text background contrast ratio design of smart large screen,this study explores the contrast ratio standard of large screen under the conditions of different viewing distances,font sizes and contrast polarities.Methods The study used a 29(contrast ratio level)*2(viewing distance)*2(font size)*2(contrast polarity)within-subject design,the dependent variable was the participant's rating of clarity.In total,we recruited 23 participants.Results Compared with the mobile web,the contrast ratio standard of the large screen is higher.Viewing distance and contrast polarity both have an impact on the large screen contrast ratio standards.The farther the viewing distance,the higher the contrast ratio standard;the contrast ratio standard is higher for negative-polarity compared to positive-polarity.At a viewing distance of 3 meters,the minimum contrast ratio of negative-polarity should not be less than 6.5,and the enhanced contrast ratio should not be less than 10;the minimum contrast ratio of positive-polarity should not be less than 6,and the enhanced contrast ratio should not be less than 9.At a viewing distance of 7 meters,the minimum contrast ratio of negative-polarity should not be less than 8.5,and the enhanced contrast ratio should not be less than 12.5;the minimum contrast ratio of positive-polarity should not be less than 6.5,and the enhanced contrast ratio should not be less than 9.5.Conclusion Our finding could be used to guide screen designs of text background contrast ratio on the large screens.