2013 Volume 12 Issue 3 Pages 431-439
Recently, touch-sensitive screens have been used for various devices: smartphones, slate PCs, personal media players, etc. Specifically, tablet terminals with a touch-sensitive screen have spread rapidly in the fields of education, medicine, business, etc. However, it has been pointed that their operability is influenced by the difficulty in sliding a fingertip. This study is aimed at examining the influence of the surface condition of the display on the operability of tablet terminals. We measured the coefficients of kinetic friction between the tip of the forefinger and several screen protection films. Our measurements indicate that the coefficient of kinetic friction of anti-glare (AG) film was about one-third that of hard coat (HC) film. Then, we conducted an experiment using these films to evaluate the relationship between the surface condition of the display and the operability. The results show that the surface condition of the display influences the accuracy and speed of operation.