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http://dx.doi.org/10.14695/KJSOS.2014.17.3.3

The effects of pixel density, sub-pixel structure, luminance, and illumination on legibility of smartphone  

Park, JongJin (Department of Industrial Psychology, Kwangwoon University)
Li, Hyung-Chul O. (Department of Industrial Psychology, Kwangwoon University)
Kim, ShinWoo (Department of Industrial Psychology, Kwangwoon University)
Publication Information
Science of Emotion and Sensibility / v.17, no.3, 2014 , pp. 3-14 More about this Journal
Abstract
Since the domestic introduction of iPhone in 2009, use of smartphones rapidly increased and many tasks, previously performed by various devices, are now performed by smartphones. In this process the importance of reading little text using small smartphone screen has become highly significant. This research tested how display factors of smartphone (pixel density, sub-pixel structure, luminance) and environmental factor (illumination) affect legibility related discomfort in text reading. The results indicated that legibility related discomfort is largely affected by pixel density, where people experience inconvenience when the pixel density becomes lower than 300 PPI. Illumination has limited effect on legibility related discomfort. Participants reported more legibility related discomfort when stimulus presented in various levels of illumination rather than single illumination level. Sub-pixel structure and luminance did not affected legibility related discomfort. Based on the results we suggest lower limit resolution of smart devices (smartphones, tablet computers) of different sizes for text legibility.
Keywords
Perceived discomfort measure; smart phone; legibility; pixel density;
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