Abstract
To develop a flexible display, smartphones with edge screens with curved displays on both sides of the main screen have been used widely. Considering that small differences in the form of smartphones, such as length, width, and thickness, could affect user experience, the effects of the curvature of the edge screen should be identified. This study aimed to investigate the effects of the curvature of edge screens on subjective feelings of smartphone users and to find out the optimal curvature. In the experiment, four nonfunctional samples with different radii of curvature (4R/6R/8R/10R) were used as samples, and participants evaluated the five subjective feelings: grip/control comfort, front/side visibility, and stability of the samples with four usage patterns. Our results revealed that 8R is the optimal curvature for the edge screen based on subjective feelings in smartphone usage. Moreover, the effect of the curvature of the edge screen on grip comfort and control comfort varied according to the usage patterns. The results of this study can be applied to design of the curvature of edge screens in smartphones and it is expected that it will contribute to improvement of users’ satisfaction.
Highlights
Smartphones have played an essential role as communication devices [1]
The results of ANOVA showed that gender and hand size had no statistically significant effects on subjective feelings (Table 4)
In the case of usage patterns, all patterns showed no significant differences in grip comfort between samples
Summary
Smartphones have played an essential role as communication devices [1]. People perceive a smartphone as a necessity in everyday life and for work because of its various functionalities, including Internet service [2]. Because smartphone penetration is increasing and the market is becoming saturated, companies are making great efforts to satisfy technological progress and user’s perceived emotion [4]. In order to gain a competitive edge over competitors in a highly competitive market, research has been actively undertaken to determine the relationship between various dimensions related to the design of smartphones, such as length, width, thickness, and weight, and the user’s subjective feelings. Pereira et al [5] studied the relationships between subjective fatigue ratings and the physical features of smartphones, including size, weight, shape, and material. Lee et al [6] identified optimal reach zones for the back-side interaction on smartphones with different widths and lengths based on subjective discomfort and muscle activation data when various tasks were given. Sung et al [7]
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