| 摘要 |
With the development of display manufacturing technology, the PPI
of mobile phone screens has been upgrading. But how the visual acuity of the
mobile phone has been changed with the increase of the mobile phone PPI has
been the issues of concern among the manufacturers all the time. In this study, we
use adaptive method to measure people’s vision acuity level under different
viewing distance conditions, so as to explore how mobile phone PPI affects
human visual acuity under different distances. This study measured the visual
acuity of 15 participants with different visual acuity level, and let them to watch
different PPI mobile phones at different distance conditions. This study found that
in general, with the increase of mobile phone PPI, the visual acuity of subjects
increased. This indicates that the PPI of different mobile phones affects the visual
acuity in the process of viewing the mobile phone. Under the view distance
within 30 cm, the difference of visual perception threshold between different PPI
mobile phones was significant, and the PPI effect of mobile phone disappeared
after more than 30 cm. A group of participants whose visual acuity level was 5.0,
for example, watch their mobile phone at close range (distance < 30 cm), PPI
value fitting curve of mobile phone actual measurement angle is lower than the
theoretical value curve; but watch their mobile phone at a far range (distance
30 cm), the actual PPI value curve approaches the theoretical value
curve, showing the optimization effect of the phone PPI on the visual acuity. |