Design and Evaluation of Chord Keyboard for Tablet Computer Manipulation


The major difference between a tablet computer and laptop is the drawing pad. Reducing the components and size of a tablet computer is surely meant to make users feel more comfortable when holding it. The focus of this research lies on the integration between chord keyboard and touch pen in tablet computers. The chord keyboard is located on upper side of the tablet computer which must be suitable for tablet computer users. The right postures for operating a tablet computer include the position of wrist and fingers, scope of the chord keyboard. On the other hand, the encoding of the chord keyboard is as follows: single-handed op- eration and using the left hand to hold and operate the chord keyboard. Other possible encodings were also tested in order to find out which encoding provides the fastest typing speed with the least amount of errors. Furthermore, this study is aimed to provide a reference for designing tablet computers in the future. The concrete conclusion of this research is stated as follows: the best holding method is operating with fingers positioned on the right side and thumb on the upper side. As for the holding stability and prevention of a typo, the thumb position is placed on the space bar. The individual movement areas of the four fingers are smaller, hence merely placing one to two buttons. This re- search applies half-QWERTY, BAT and ten-key as chord encodings to evaluate typing speed and errors. The typing positions are distributed on the following positions: tablet computer's upper side of the chord keyboard, touch pen's button, and virtual button of tablet computer's window. According to the evaluation, it is found that the button with the fewest encodings have the best typing efficiency. On the other hand, the usage of button on the touch pen is much more effective than the virtual button on the screen.

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    ABSTRACT: This invention is a system for input to computers using only one hand. It uses a single-handed chord system that is based on Braille and compatible with the BAT chordic keyboard. Use of the system provides the advantages of single-handed input; the speed, accuracy and repetitive strain injury protection of chordic keyboards; chords that are analagous to standard braille cells; and access to the full ASCII character set. The system should be beneficial to any computer user who wants efficient single-handed input, and especially those that are blind, have use of only one hand, or are concerned about repetitive strain injuries. It can be used for input to the Macintosh, to PC compatible computers or to Unix-based systems
    Computing Applications to Assist Persons with Disabilities, 1992., Proceedings of the Johns Hopkins National Search for; 03/1992
  • Conference on Human Factors in Computing Systems, CHI 1992, Monterey, CA, USA, May 3-7, 1992, Proceedings; 01/1992
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    ABSTRACT: The familiar QWERTY keyboard has become an international standard, and is the universal layout for computer and typewriter keyboards despite evidence that other layouts are easier to learn and can be used more rapidly. The hard-won skill of the many QWERTY users has been an effective bar to keyboard reform. However, the “soft keyboard”, in which the assignment of characters to keys can easily be changed, now offers the possibility that an improved keyboard could be chosen and implemented along with QWERTY on dual-layout keyboards. Keyboards now serve principally for computer input, rather than only as part of the typewriter: this expansion of role modifies and complicates the choice of a new standard keyboard layout. This article discusses keyboard reform and concludes that the soft keyboard does, indeed, offer a promising opportunity for progress.
    International Journal of Man-Machine Studies 11/1984; 21(5-21):445-450. DOI:10.1016/S0020-7373(84)80070-X