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Basic study on the rectangular numeric keys for touch screen.

H Harada1, T Katsuura, Y Kikuchi

  • 1Department of Ergonomics, Faculty of Engineering, Chiba University, Japan.

Journal of Human Ergology
|June 1, 1997
PubMed
Summary
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Optimizing touch screen numeric key design, this study found that a 3 mm inter-key spacing significantly improved response times. Vertical key layouts also outperformed horizontal ones for faster data entry.

Area of Science:

  • Human-Computer Interaction
  • Usability Engineering
  • Ergonomics

Background:

  • Touch screen interfaces are ubiquitous, but optimal design parameters for numeric keypads require further investigation.
  • Efficient data entry on touch screens is crucial for user experience and productivity.

Purpose of the Study:

  • To determine the optimal inter-key spacing for numeric rectangular keys on touch screens.
  • To evaluate the impact of key layout (horizontal vs. vertical) on touch screen performance.

Main Methods:

  • An experiment involving nine participants performing data entry tasks on touch devices with varying rectangular key sizes (12x21 mm, 15x39 mm) and inter-key spacings (0, 3, 6, 12, 21 mm).
  • Keys were arranged in both horizontal and vertical layouts.
  • Response times and subjective ratings were collected.

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Main Results:

  • A 3 mm inter-key spacing resulted in significantly faster response times compared to 0, 12, and 21 mm spacings (p < 0.05).
  • Vertical key positions yielded faster response times than horizontal positions.
  • Subjective ratings indicated that 6 mm inter-key spacing was significantly preferred over other spacings (p < 0.05).

Conclusions:

  • A 3 mm inter-key spacing is recommended for optimizing numeric key performance on touch screens.
  • Vertical key arrangements offer superior response times for touch screen data entry.
  • While 3 mm spacing improved speed, 6 mm spacing was subjectively preferred, suggesting a balance between speed and comfort may be optimal.