A reduced QWERTY keyboard for mobile text entry

ABSTRACT

In this paper we describe a specialized keyboard for text entry that maps four rows of a standard keyboard onto the home row, with different characters encoded via modifier keys and multi-tap input. Use of the keyboard also relies on lexicon-based disambiguation. This design has two motivations: limiting physical space requirements and capitalizing on user knowledge of the standard QWERTY keyboard layout. The resulting "stick" keyboard is between 15% and 25% of the size of a standard keyboard. In a preliminary empirical study, users reached half of their normal typing speed using lexicon-based disambiguation (22.5 wpm) and a reasonable but lower speed with multi-tap input (10.4 wpm) with only a few minutes of practice.

REFERENCES

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INDEX TERMS

Primary Classification:
  H. Information Systems
  H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)
      H.5.2 User Interfaces (D.2.2, H.1.2, I.3.6)

Keywords:
input devices, keyboards, multi-tap, text entry