Ergonomic, adaptable keyboard for fast data entry on mobile computing devices

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.Includes bibliographical references (leaves 22-24).The usefulness of modem portable computational devices such as cellular phones and portable digital assistants (PDAs) is currently limited by the lack of an effective method for text entry. The currently available input options (such as the 12-key phone pad and PDA touch screens) are a quarter to a third of the speed of the standard desktop QWERTY keyboards. Therefore, it is slow and frustrating for people to use these systems for any significant text input, such as writing emails, taking notes in a meeting, or writing down thoughts while on-the-go. The proposed solution is a one-handed, hand-held, wireless, portable keyboard that would allow the mobile device user to achieve speeds closer to the desktop standard while performing text-entry tasks. Previously developed handheld input devices employ unfamiliar typing systems, are too large, or are not ergonomically comfortable, which may be the reasons they have not been widely adopted by the public. The device described in this paper is small enough to store in one's pocket, is inconspicuous during use, and is adjustable so that the keys reach the fingers in their natural curved position. One interface point allows each finger to control multiple buttons thereby preventing the fingers from, needing to move into uncomfortable positions.(cont.) These features were incorporated into a prototype that proves the feasibility of a compact and comfortable hand-held keyboard. The device also has potential as an ergonomic replacement to the standard desktop keyboard. Unlike traditional keyboards it allows the typist to be relaxed and mobile eliminating some risk factors for repetitive strain injury.by Alexander Mekelburg.S.B

Ergonomic, adaptable keyboard for fast data entry on mobile computing devices

ABSTRACT The usefulness of modern portable computational devices such as cellular phones and portable digital assistants (PDAs) is currently limited by the lack of an effective method for text entry. The currently available input options (such as the 12-key phone pad and PDA touch screens) are a quarter to a third of the speed of the standard desktop QWERTY keyboards. Therefore, it is slow and frustrating for people to use these systems for any significant text input, such as writing emails, taking notes in a meeting, or writing down thoughts while on-the-go. The proposed solution is a one-handed, hand-held, wireless, portable keyboard that would allow the mobile device user to achieve speeds closer to the desktop standard while performing text-entry tasks. Previously developed handheld input devices employ unfamiliar typing systems, are too large, or are not ergonomically comfortable, which may be the reasons they have not been widely adopted by the public. The device described in this paper is small enough to store in one's pocket, is inconspicuous during use, and is adjustable so that the keys reach the fingers in their natural curved position. One interface point allows each finger to control multiple buttons thereby preventing the fingers from needing to move into uncomfortable positions. These features were incorporated into a prototype that proves the feasibility of a compact and comfortable hand-held keyboard. The device also has potential as an ergonomic replacement to the standard desktop keyboard. Unlike traditional keyboards it allows the typist to be relaxed and mobile eliminating some risk factors for repetitive strain injury. Although the QWERTY keyboard is the current PC input standard, there are ergonomic problems associated with stationary desktop keyboards. They force the users to sit at their computers with their backs, arms and wrists stationary (and often tense) for long periods of time while they type. Typing guidelines therefore encourage computer users to take breaks to get up and move around. A better solution is a keyboard that doesn't keep their body rigid -one that lets the user be relaxed and mobile while typing In this paper a hand-held, portable, wireless keyboard is introduced that may improve both mobile text entry and traditional desktop keyboard data entry. The prototype device is the first to be compact enough for comfortable storage and discreet use while also placing the fingers in a comfortable, natural position. It provides the ability to utilize existing typing skills by being able to mimic the layout of QWERTY keyboard. The device can be used in one hand for quick on-the-go text entry, or two could be used simultaneously for faster typin

Designs for a general purpose wearable computer

To provide input and control, wearable computer solutions must replace the familiar desktop interface devices of keyboard and mouse with specialized hardware. While successful wearable input solutions have been developed for domain specific applications, a standard input interface for general purpose wearable computing has yet to emerge. The steep learning curves and unruly hardware of the solutions proposed thus far are one of the factors keeping wearable computing out of the mainstream. This thesis proposes a new input and control approach that increases wearable computing usability by integrating several commonly available devices into a comprehensive system. The proposed system integrates commercial, off the shelf hardware together with generalized software applications that increase the usability and general utility of a wearable computer. The hardware consists of a wearable computer, a clip-on microdisplay eyepiece and a standard PDA running Pocket PC. Through a Bluetooth network, the PDA can wirelessly control the text input (keyboard) and pointer control (mouse) of the wearable computer. The software consists of two applications designed to provide easy access to new content and previously stored data. One application presents a user with a continuous scroll of new content which can be attended to at the user\u27s discretion. The content is dynamically retrieved from any online sources, and can range from news feeds and stock quotes to calendars and weather reports. New content can be added to the user\u27s persistent digital store at any time. The second application, a private peer-to-peer data sharing program called the Tangle, was developed to fuse the user\u27s multiple data sources (home or work computer, wearable computer, PDA) into a single, searchable repository. Tangle also provides easy access to the digital assets of other, trusted Tangle users. Tangle makes it easy for virtually any content that a user encounters while using the system to be easily added to the user\u27s persistent data store

Near Eyes-Free Chauffeur Computer Interaction with Chording and Visual Text Mnemonics

Modern cars are equipped with advanced technology requiring cognitively complex operation that is reliant on the user’s visual attention. It is therefore hazardous for drivers to operate such devices while driving. In this paper a user interface interaction style for in-car user interfaces are proposed. Users interact with the in-car computer using three chording keys and chording pattern sequences are derived based on visual mnemonics. Cases are illustrated for an in-car multimedia system, a mobile phone and a GPS-navigation system. Experimental results demonstrate that the technique is easy to learn, efficient to use and require low visual attention

Beginners Performance with MessagEase and QWERTY

With the increased use of mobile phones, interest in text entry with them has also amplified. Many new mobile phones are equipped with a QWERTY keypad; new methods to surpass the QWERTY performance are also being developed. This thesis compares user performance of virtual QWERTY keypad to MessagEase. MessagEase uses 9 keys and can therefore be used even on very small touch displays. 9 characters are entered with tapping and the rest with a tap-and-slide gesture. An experiment was conducted with 10 participants transcribing text with both text entry techniques. The experiment consisted of three sessions. In each session, the participants transcribed 30 phrases in total - 15 phrases using each text entry technique. Responses to the System Usability Scale (SUS) for each text entry technique and informal interview data were also collected. From a Repeated-measures analysis of variance a significant effect of the text entry method on text entry rate was seen (F1,19= 47.140, p < 0.0001). The effect of the session (i.e. learning) was also statistically significant (F2,18= 3.631, p = 0.047).The interaction of the session and method was also statistically significant (F2,18= 10.286, p = 0.001) indicating different learning rates. Average text entry speed with MessagEase was 7.43 words per minute (wpm) in the first session and 10.96 wpm in the third session. Likewise, text entry speed with the QWERTY soft keyboard was 17.75 wpm in the first session and 17.16 wpm in the third session. No significant difference was found in the error rates. Keywords: text entry method, MessagEase, QWERT

Predicting and Reducing the Impact of Errors in Character-Based Text Entry

This dissertation focuses on the effect of errors in character-based text entry techniques. The effect of errors is targeted from theoretical, behavioral, and practical standpoints. This document starts with a review of the existing literature. It then presents results of a user study that investigated the effect of different error correction conditions on popular text entry performance metrics. Results showed that the way errors are handled has a significant effect on all frequently used error metrics. The outcomes also provided an understanding of how users notice and correct errors. Building on this, the dissertation then presents a new high-level and method-agnostic model for predicting the cost of error correction with a given text entry technique. Unlike the existing models, it accounts for both human and system factors and is general enough to be used with most character-based techniques. A user study verified the model through measuring the effects of a faulty keyboard on text entry performance. Subsequently, the work then explores the potential user adaptation to a gesture recognizer’s misrecognitions in two user studies. Results revealed that users gradually adapt to misrecognition errors by replacing the erroneous gestures with alternative ones, if available. Also, users adapt to a frequently misrecognized gesture faster if it occurs more frequently than the other error-prone gestures. Finally, this work presents a new hybrid approach to simulate pressure detection on standard touchscreens. The new approach combines the existing touch-point- and time-based methods. Results of two user studies showed that it can simulate pressure detection more reliably for at least two pressure levels: regular (~1 N) and extra (~3 N). Then, a new pressure-based text entry technique is presented that does not require tapping outside the virtual keyboard to reject an incorrect or unwanted prediction. Instead, the technique requires users to apply extra pressure for the tap on the next target key. The performance of the new technique was compared with the conventional technique in a user study. Results showed that for inputting short English phrases with 10% non-dictionary words, the new technique increases entry speed by 9% and decreases error rates by 25%. Also, most users (83%) favor the new technique over the conventional one. Together, the research presented in this dissertation gives more insight into on how errors affect text entry and also presents improved text entry methods