Abstract
E-reading devices are becoming more and more common in our daily life, and they are used under a wide range of ambient light levels, from completely dark to extremely bright conditions. In this study, a psychophysical experiment is carried out to investigate how ambient light level affects the visual comfort of an e-reading device. Human observers compare the visual comfort of pairs of different text-background lightness combinations on a tablet device under three ambient light levels (i.e., 150, 1500, and 15,000 lx). With our previous work, the experimental results show that the trend of visual comfort interval scales below 1500 lx (i.e., Dark, 150, 300, and 1500 lx) are similar to each other but not for those under illuminance above the 1500 lx (i.e., 3000 and 15,000 lx). For the same lightness difference between text and background, the observers tend to read the text with a white background compared to a black background, especially for 3000 and 15,000 lx. Moreover, a black text on a light-gray background is the most comfortable combination under these two illuminance levels. An evaluation model is proposed based on ambient illuminance, screen parameters, and visual estimation to design an optimal viewing condition when reading on the tablet display.
Highlights
IntroductionTablet devices have become more and more common in a human’s daily life
In recent years, tablet devices have become more and more common in a human’s daily life
The results indicate that the observers tend to prefer a high text-background lightness difference combination under the 15,000 lx condition
Summary
Tablet devices have become more and more common in a human’s daily life. People use tablets for work, entertainment, and communication. Na et al studied how adaptive display luminance [15], luminance contrast [16], and luminance difference between text and background [17] affected the visual comfort when reading on smartphone displays. Based on the experiment results, a model was developed to design the adaptive display luminance to improve users’ visual comfort and satisfaction. Yu et al carried out two experiments to find the optimal luminance contrast and difference to improve the reading performance through self-report surveys and a brainwave analysis quantifying the visual comfort, physiological stress, reading speed, and preference. It was found that the tablet display luminance should be set higher than the ambient luminance level [18]
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