Abstract
Many questions regarding single-hand text entry on modern smartphones
(in particular, large-screen smartphones) remain under-explored, such
as, (i) will the existing prevailing single-handed keyboards fit for
large-screen smartphone users? and (ii) will individual-customization
improve single-handed keyboard performance? In this paper we study
single-handed typing behaviors on several representative keyboards on
large-screen mobile devices. We found that, (i) the user-adaptive-shape
curved keyboard performs best among all the studied keyboards; (ii)
users’ familiarity with the Qwerty layout plays a significant role at
the beginning, but after several sessions of training, the user-adaptive
curved keyboard can have the best learning curve and performs best;
(iii) generally the statistical decoding algorithms via spatial and
language models can well handle the input noise from single-handed
typing.