The Effects of Ambient Illuminance and Aging on the Evaluation of the Readability of E-paper

抄録

We carried out an experiment to evaluate the effects of ambient illuminance and aging on the readability of E-papers. On the basis of this and our prior studies under various illuminance conditions, we suggest that subjective performance declines with decreasing illuminance, and that illuminance of 300 lx is the limiting lighting level at which subjects can maintain their performance. Furthermore, our findings indicate the possibility that subject scores of 45 to 47 on a Visual Analog Scale (VAS) indicate passable readability. With regard to aging, the built-in light sources of backlit LCDs and E-paper contribute to improving subjective evaluations, especially for the elderly group in the lower illuminance conditions. However, the younger groups tended to rate the self-luminescent devices poorly at higher levels of illuminance, suggesting that improvements in these devices are needed for these higher levels of lighting.