Abstract
Slide-in and Tap (SliT) is a software keyboard developed for smartwatches which focuses on reducing screen occupation. The initial display has three edges of the screen, excluding the bottom edge, each divided into two segments. One segment is selected using a slide-in motion, which is an operation of sliding a finger from the outside of the screen to the center of the screen. Given that the slide-in can be detected with a width of 2 mm, the screen occupancy of SliT is 26.4% of a 1.6-inch screen. This percentage is lower than competing methods. Two rows of the Japanese syllabary table are assigned to each segment. When the slide-in crosses a segment, the screen is split into two areas and the names of the rows assigned to that segment are displayed one by one. By lifting the finger up from within the area, the displayed row is selected. Then, the screen is divided into 9 squares in a 3x3 pattern and five hiragana characters from the selected row are displayed individually. A character is selected by tapping on it. It is simple to learn this operation. In the experiment, the average input speed of subjects after 5.3 min of use was 28.7 [CPM].
