Lecture 8: Interaction Devices

Lecture 8: Interaction Devices

1. keyboard layout

   • QWERTY layout
   • Dvorak layout
   • ABCDE style
   • function keys (ALT / CTRL / CUT / COPY...)
   • cursor movement keys
   • keyboard & keypads for small devices (wireless / foldable / virtual / cloth keyboards; soft keys; pen & touchscreens)

2. pointing devices

   • select
   • position
   • orient
   • path
   • quantify
   • text
   • direct control devices (easy to learn & use) [eg: lightpen, touchscreen, stylus]
   • indirect control devices (take time to learn) [eg: mouse, trackball, joystick, graphics tablet, touchpad, trackpoint...)
   • non-standard devices (for special purpose) [eg: eye-trackers, sensor, Haptic feedback...]

3. Fitts' Law

   • quantitative method of modeling user performance
   • apply to interface design (larger button, close to average position)
   • right click menu reduce travel distance; pie menu design better than drop down menu
   • input device selecting considerations (users physiological capabilities; user expertise; appropriate for task; intended work & environment)

4. Haptic feedback

   • tactile feedback (apply vibration & forces to body)
   • vibrotactile feedback stimulate sense of touch)
   • application: mobile phone, virtual surgery, sensory-motor skills...

5. speech & audditory interfaces

   • opportunities (when hand busy; when required mobility, when have vision impairements...)
   • technologies (discrete-word recognition, continuous-speech recognition, speech stor & forward, speech generation, voice info system...)
   • obstacles (unstable environment, difficult in scan / search...)
   • sound feedback (confirm actions; warning; for visually impaired users; provide mood context)

6. displays - small & large

   • features (physical dimensions; resolution; number of available colours / colour correctness; luminance, contrust, glare; power consumption; refresh rate; cost; reliability)
   • characteristics (protability; privacy; saliency; ubiquity; simultaneity)
   • display technology
     • small display
       • monochrome display
       • RGB shadow-mask display
       • raster-scan cathode-ray tube
       • liquid-crystal display
       • plasma panel
       • light-emitting diodes
       • electronic ink
       • braille displays
     • large display
       • informational wall display
       • interactive wall display
       • multiple desktop display
       • heads-up & helmet mounted display