Dominant-handed Pen + Touch Input

Limit capacity for pen input, low accuracy and finger occlusion for touch input exist in single-handed input situations. To take advantage of pen and touch input, pen + touch input techniques were proposed to improve the dominant-handed input. First, a target docking experiment was designed and carried out to analyze the characteristics of pen and touch inputs. Then, 3 pen + touch input techniques, which were Sequence, Overlap and Parallel, were proposed in drawing scenario. Moreover, Button-click was also proposed as a reference technique for comparison. Comparative experiment was conducted to investigate the performance of the 4 techniques. Results showed that, for small targets, pen performed better than touch on accuracy and speed. Compared to Button-click, Overlap reduced the operation time and trajectory offset by 15.9% and 0.2%; Parallel increased the operation time and trajectory offset by 25.6% and 40.5% respectively; Sequence increased the operation time by 11.2%, but reduced the trajectory offset by 12.8%. Finally, the application scenarios of these techniques were given, which is instructive to dominant-handed pen + touch interaction and user interface design.