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Browse Prior Art Database

Typing Keyboard Optimization for Hand-Held Computers

IP.com Disclosure Number: IPCOM000112878D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 4 page(s) / 78K

Publishing Venue

IBM

Related People

Kennedy, PJ: AUTHOR [+3]

Abstract

Described is a hardware implementation that optimizes the 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 82% of the total text.

Typing Keyboard Optimization for Hand-Held Computers

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

      The essential element of the typing keyboard optimization for
hand-held computers is that it is a typing key layout for
single-finger, or stylus entry, including pen-based and non-
pen-based systems.  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.  Fig. 1 shows a typical QWERTY typing key layout in a
conventional computer keyboard.  Extensive use of the QWERTY layout
is such that it is considered optimal for ten-fingered typing but not
optimal for single fingered typing.

      The concept described herein is an optimized typing keyboard
arranged in a matrix that minimizes the maximum interkey distance.
It is based on a statistical analysis of English language digraphs
designed to minimize the distance between commonly co-occurring
English letters.

      The arrangement that minimizes the maximum interkey distance is
a matrix that is approximately 5 x 5 keys.  Fig. 2 shows a
digraph-based arrangement of typing keys in a layout that minimizes
the maximum interkey distance. ...