タッチパネル携帯端末におけるスライダの操作性評価

抄録

The recent spread of portable terminals with touch-sensitive screens has been remarkable; these terminals can be operated easily. Moreover, user interface design allows for a flexible design of the screen interface. However, owing to the large width of the user’s thumb, operating the terminal accurately becomes difficult. Therefore, many studies have attempted to improve the icon/button operability; however, only a few have focused on sliders. Sliders have two operational problems: first is the difficulty in precisely pointing before dragging owing to the small size of the slider thumb or inappropriate position of the slider; and second is the inability of the user to correctly position the slider. In this study, we conduct two experiments to overcome these problems. The first experiment reveals that the slider thumb can be pointed accurately and quickly when the size of the slider thumb is greater than 8.0 mm, and it is positioned in the center of the screen. The second experiment shows that both the time taken to adjust the position and subjective ease of the drag operation improve when the movement ratio is 0.7 or 0.8. Additionally, when the movement ratio is decreased to 0.3, the slider thumb adjustment is more precise.