Character Input Method Working on 1-in. Round Screen for Tiny Smartwatches

We have developed a method for entering Japanese hiragana characters using a 1-in. circular screen. The circumference of the smartwatch screen is divided every 90°. Hiragana is divided into 10 groups of 5 characters each, so the first half of the group is assigned to the left segment and the second half is assigned to the upper segment.