Browse Prior Art Database

Rectangular Typing Key Layout for Hand-Held Computers

IP.com Disclosure Number: IPCOM000112919D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Kennedy, PJ: AUTHOR [+3]

Abstract

Described is a hardware implementation that provides a rectangular typing key layout for single-finger, or stylus input, devices, as used in hand-held computers.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Rectangular Typing Key Layout for Hand-Held Computers

      Described is a hardware implementation that provides a
rectangular typing key layout for single-finger, or stylus input,
devices, as used in hand-held computers.

      The essential element the rectangular typing keyboard is that
it is a typing key layout optimized for hand-held computing devices,
including pen-based and non-pen-based systems, given that the new
layout must fit in an existing QWERTY type arrangement.  Previous
reduced size keyboards for these devices have either adopted the
standard QWERTY layout, or an alphabetic layout in a conventional key
arrangement.  Empirical and analytical research indicates that
alphabetic layouts are inferior to the QWERTY layout even for
unskilled typists using reduced size keyboards.

      The concept described herein is based on a statistical analysis
of English language digraphs to minimize the distance between
commonly co-occurring English letters.  A predictive human
performance model indicates that this layout should be approximately
twenty-two percent better than a comparable QWERTY layout.  The
layout is optimized for hand-held computers so that the layout can be
placed in a QWERTY-type rectangular arrangement.  The figure shows
the digraph-based typing key layout for a conventional computer.