中文摘要：

已有研究表明：环境照度、计算机显示器的屏幕亮度和对比度会影响用户的任务操作绩效。本研究采用视觉搜索任务，从行为绩效、主观评价以及眼睛疲劳度指标来考察环境照度、手机屏幕亮度对视觉搜索绩效的影响，并提出在不同的环境照度下手机屏幕亮度的最优值设置参数。结果表明：（1）当手机屏幕亮度保持不变时，不同环境亮度下的搜索绩效差异显著。（2）当环境照度为Olx时，手机屏幕亮度的最优值在11cd／m。左右；环境照度为1001x时，手机屏幕亮度的最优值是68cd／m。左右，环境照度为5001x时，手机屏幕亮度最优值是257cd／m0左右。

英文摘要：

Previous studies have shown that ambient illumination, screen brightness and contrast of the computer affects the user＇s visual task performance. In the era of mobile internet, mobile devices are more and more important in people＇s work and life. Domestic and foreign researchers have conducted extensive research in ergonomics factors, which could affect the display performance. These factors included the display object, the environmental illuminance, the screen brightness and the contrast. Early studies were mostly concerned about CRT or large LCD display. There has been no relevant research about the effect of environmental illuminance on visual perform- ance of mobile phones and the optimal parameters of phone screen brightness under different environmental illuminance. In the present study, behavioral performance, subjective evaluation and eye fatigue indices were used to examine the impact of the environmental illumination on the visual search task performance on cell phone. A total of 64 undergraduates participated in a visual search task, 16 of whom took part in Experiment 1 and the remainder took part in Experiment 2. They were all college students with normal or corrected normal vision and all were fight - handed. The experiments carried out in the quiet 3 x 5 m2 laboratory. The light in the laboratory could be adjusted to control environment illumination with the maximum illumination value of 500 Ix. Additionally, a touch screen mobile phone （ Samsung $5660 with 3.2 inch TFT - LCD screen, resolution 480 x 320）, the PR880 luminance meter, the YF2006 illuminometer, and the BD - II - 118 type flash fusion frequency instrument were used in the study. In Experimentl, when the phone screen brightness remained unchanged, the visual search performances under different levels of environmental illumination were investigated. Single - factor within - subjects designs were adopted with independent variable including ambient illumination in three levels： 0 Ix, 100 Ix, and 500 Ix. After practice, participan